Title 51 WAC — Enterprise Services, Department of (Building Code Council)

Chapter 51-04 Policies and procedures for consideration of statewide and local amendments to the State Building Code.

Wash. Admin. Code § 51-04-010 Declaration of purpose.

The Washington state building code council, hereinafter called the council, is required by chapter 266, Laws of 1988, to adopt and maintain the state building code, hereinafter referred to as the building code, as provided in chapters 19.27, 19.27A, and 70.92 RCW, and the state legislature.

(1) The primary objective of the council is to encourage consistency in the building code throughout the state of Washington and to maintain the building code consistent with the state's interest as provided in RCW 19.27.020. An objective of statewide adoption is to minimize state amendments to the model codes.

The building code shall be as defined in WAC 51-04-015(8).

(2) The council is also required by RCW 19.27.074 to approve or deny all city and county amendments to the building code that apply to single family or multifamily buildings as defined in RCW 19.27.015.

(3) The council may issue opinions relating to the codes at the request of a local official charged with the duty to enforce the enumerated codes as specified in RCW 19.27.031 and 19.27A.015.

(4) The purpose of this chapter is to establish policies and procedures for:

(a) Submittal and council review and consideration of proposed statewide amendments to the building code;

(b) Submittal and council review and consideration of proposed city and county amendments to the building code that apply to single family or multifamily buildings as defined in RCW 19.27.074;

(c) Reconsideration of council actions; and

(d) Issuing opinions to local officials.

History

• Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 19-24-078, § 51-04-010, filed 12/2/19, effective 1/2/20. Statutory Authority: RCW 19.27.031, 19.27.074 and 19.27.035. WSR 17-03-123, § 51-04-010, filed 1/18/17, effective 2/18/17. Statutory Authority: RCW 19.27.035, 19.27.074 and chapters 19.27 and 34.05 RCW. WSR 07-15-043, § 51-04-010, filed 7/13/07, effective 8/13/07. Statutory Authority: Chapters 19.27 and 34.05 RCW and 1989 c 348. WSR 90-02-108, § 51-04-010, filed 1/3/90, effective 2/3/90
• Order 76-02, § 51-04-010, filed 9/1/76.

Wash. Admin. Code § 51-04-015 Definitions.

(1) "Council" means the Washington state building code council.

(2) "Emergency statewide amendment" means any proposed statewide amendment, the adoption of which is necessary immediately in order to protect life, safety or health of building occupants; preserve the structural integrity of buildings built to the state building code; to correct errors and omissions; or by the direction of the Washington state legislature or federal legislation. Emergency statewide amendments to the state building code must be adopted in accordance with the Administrative Procedure Act, chapter 34.05 RCW.

(3) "Local government amendment" means any amendment to the state building code, as adopted by cities or counties for implementation and enforcement in their respective jurisdictions.

(4) "Local government residential amendment" means any amendment to the state building code, as adopted by cities or counties for implementation and enforcement in their respective jurisdictions, that applies to single and multifamily buildings as defined by RCW 19.27.015.

(5) "Local official" and "code official" means the officer or other designated authority charged with the administration and enforcement of the codes adopted under chapters 19.27 and 19.27A RCW.

(6) "Model codes" means the codes developed by the model code organizations and adopted by and referenced in chapter 19.27 RCW.

(7) "Model code organization(s)" means the national code-promulgating organizations that develop the model codes (as defined herein), such as the International Code Council, International Association of Plumbing and Mechanical Officials, and National Fire Protection Association.

(8) "State building code" means the codes adopted by and referenced in chapter 19.27 RCW; the state energy code; and any other codes so designated by the Washington state legislature as adopted and amended by the council.

(9) "Statewide amendment" means any amendment to the model codes, initiated through council action or by petition to the council from any agency, city or county, or interested individual or organization, that would have the effect of amending the building code for the entire state of Washington. Statewide amendments to the state building code must be adopted in accordance with the Administrative Procedure Act, chapter 34.05 RCW.

(10) "State building code update cycle" means that period during which the model code and standards referenced in chapter 19.27 RCW are updated and amended by the council in accordance with the Administrative Procedure Act, chapter 34.05 RCW hereinafter referred to as the "adoption period" and those additional periods when code changes are received for review as proposed amendments to the model codes, hereinafter referred to as "submission periods."

History

• Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 19-24-078, § 51-04-015, filed 12/2/19, effective 1/2/20. Statutory Authority: RCW 19.27.031, 19.27.074 and 19.27.035. WSR 17-03-123, § 51-04-015, filed 1/18/17, effective 2/18/17. Statutory Authority: RCW 19.27.190, 19.27.020, and chapters 19.27 and 34.05 RCW. WSR 05-23-104, § 51-04-015, filed 11/17/05, effective 1/1/06. Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 04-01-107, § 51-04-015, filed 12/17/03, effective 7/1/04. Statutory Authority: RCW 19.27.035 and 19.27.074. WSR 98-24-077, § 51-04-015, filed 12/1/98, effective 7/1/99. Statutory Authority: RCW 19.27.074. WSR 98-02-048, § 51-04-015, filed 1/5/98, effective 7/1/98. Statutory Authority: RCW 19.27.035 and chapter 34.05 RCW. WSR 94-05-058, § 51-04-015, filed 2/10/94, effective 3/13/94. Statutory Authority: Chapters 19.27 and 34.05 RCW and 1989 c 348. WSR 90-02-108, § 51-04-015, filed 1/3/90, effective 2/3/90.

Wash. Admin. Code § 51-04-018 Petition for preliminary review.

An agency, city or county, wishing to submit local government residential amendments to the building code for council consideration, may file with the council a petition for preliminary review of the local government residential amendment, in order to solicit comments from council members and interested parties, prior to council action.

The council may refer a petition for preliminary review to one of the council standing committees for review and comment.

History

• Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 19-24-078, § 51-04-018, filed 12/2/19, effective 1/2/20. Statutory Authority: RCW 19.27.035 and chapter 34.05 RCW. WSR 94-05-058, § 51-04-018, filed 2/10/94, effective 3/13/94. Statutory Authority: Chapters 19.27 and 34.05 RCW and 1989 c 348. WSR 90-02-108, § 51-04-018, filed 1/3/90, effective 2/3/90.

Wash. Admin. Code § 51-04-020 Rules for the consideration of proposed statewide amendments.

(1) All petitions for statewide amendments to the building code must be compliant with the requirements set forth in WAC 51-04-025.

(2) The council will accept and consider compliant petitions for emergency statewide amendments to the building code at any time, in accordance with RCW 19.27.074 and chapter 34.05 RCW.

(3) The council will accept and consider compliant petitions for statewide amendments that are submitted within the time periods the council posts for petitions relating to Group 1 and Group 2 amendments to be made in conjunction with the state building code update cycle.

(a) For the purpose of review and adoption of new model code editions and statewide amendment submission, the state building code shall be divided into two groups as follows, unless otherwise directed by the council:

(i) Group 1: International Building Code (IBC); International Existing Building Code (IEBC); International Fire Code (IFC) Washington state energy code-commercial (WSEC-C) and Wildland Urban Interface Code (WUI).

(ii) Group 2: International Residential Code (IRC); International Mechanical Code (IMC); International Fuel Gas Code (IFGC); standards liquefied petroleum gas are National Fire Protection Association (NFPA) standards 58 and 54; Uniform Plumbing Code (UPC); Washington state energy code-residential (WSEC-R).

(b) During August of the year before the year of the model code edition, the council will post a timeline for Group 1 and Group 2 code update processes, including providing separate periods of at least sixty days for the submission of petitions for statewide amendments for each group the council reserves the right to modify its timeline as it determines necessary and appropriate.

(c) The timeline shall include deadlines for committee transmittal to council of separate reports for Group 1 and Group 2 that identify:

(i) The significant changes contained in the new model codes from the prior model codes;

(ii) The existing state amendments to prior model codes that are proposed to be modified or eliminated; and

(iii) All committee proposed amendments to the new model codes. The reports shall be posted on the council website.

(d) The council shall direct council staff to submit a CR-102 to the code reviser's office containing any proposed rules that the council has approved and shall conduct at least two public hearings for each group (one in western Washington and one in eastern Washington) following the filing of the proposed rules with the code reviser's office.

(e) Upon completion of the council's review of Group 1 amendments (not including Group 1 amendments the council directs be kept open for consideration during the Group 2 period), the council will commence review of Group 2 amendments following the timeline.

(4) The council will accept and consider compliant petitions for all other statewide amendments to the state building code if one or more of the following criteria are met:

(a) The amendment is directed by the legislature;

(b) The amendment is necessary for code correlation, correction of errors, language clarification, or section update; or

(c) The council determines that the amendment would serve a critical public interest and requires immediate/accelerated action.

(5) The council shall review proposed new statewide amendments, and approve those meeting the appropriate criteria to file as proposed rules in accordance with chapter 34.05 RCW. The proposed rules filing shall include a small business economic impact statement in accordance with chapter 19.85 RCW.

(6) The code development period shall conclude with formal adoption of the state building code as amended by the council. As required by RCW 19.27.074, all decisions to adopt or amend the state building code shall be made prior to December 1st and shall not take effect before the end of the regular legislative session in the next year.

Provided, the December 1st deadline shall not apply to emergency rules or expedited adoption of rules under the Administrative Procedure Act, chapter 34.05 RCW.

(7) State amendments as approved by the council shall be submitted to the appropriate model code organization, at the direction of the council, except those adopted for consistency with state statutes or regulation and held for further review during the adoption period of those model codes by the council.

History

• Statutory Authority: RCW 19.27.035 and 19.27.074. WSR 21-01-049, § 51-04-020, filed 12/8/20, effective 1/8/21. Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 19-24-078, § 51-04-020, filed 12/2/19, effective 1/2/20. Statutory Authority: RCW 19.27.031, 19.27.074 and 19.27.035. WSR 17-03-123, § 51-04-020, filed 1/18/17, effective 2/18/17. Statutory Authority: RCW 19.27.035, 19.27.074 and chapters 19.27 and 34.05 RCW. WSR 07-15-043, § 51-04-020, filed 7/13/07, effective 8/13/07. Statutory Authority: RCW 19.27.190, 19.27.020, and chapters 19.27 and 34.05 RCW. WSR 05-23-104, § 51-04-020, filed 11/17/05, effective 1/1/06. Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 04-01-107, § 51-04-020, filed 12/17/03, effective 7/1/04. Statutory Authority: RCW 19.27.035 and chapter 34.05 RCW. WSR 94-05-058, § 51-04-020, filed 2/10/94, effective 3/13/94. Statutory Authority: Chapters 19.27 and 34.05 RCW and 1989 c 348. WSR 90-02-108, § 51-04-020, filed 1/3/90, effective 2/3/90
• Order 76-02, § 51-04-020, filed 9/1/76.

Wash. Admin. Code § 51-04-025 Procedure for submittal of proposed statewide amendments.

(1) Statewide and emergency statewide amendments to the state building code shall conform to the purposes, objectives, and standards prescribed in RCW 19.27.020.

Applications for proposed statewide amendments shall be complete, include a detailed economic analysis of impacts of the proposed statewide amendment and be submitted in writing to the council, on the form provided by the council. The amendment must address existing model code language; a change in the model codes since a previous edition; or an existing state or local amendment to the model code; or a portion of the state code other than the model code. The state building code council shall consider the action of the model code organizations in their consideration of these proposals.

Statewide and emergency statewide amendments to the state building code shall be based on one of the following criteria:

(a) The amendment is needed to address a critical life/safety need.

(b) The amendment clarifies the intent or application of the code.

(c) The amendment is necessary for consistency with state or federal laws and regulations.

(d) The amendment corrects errors and omissions.

(e) The amendment eliminates an obsolete, conflicting, duplicating or unnecessary regulation.

(2) Petitions for statewide amendments to the building code shall be submitted to the council during the submission period and the adoption period in accordance with WAC 51-04-020. Minimum requirements specified on the form for submittals must be included. Incomplete submittals will be held for thirty days and the proponent will be notified with a request for more information. If after thirty days, the applicant has not provided requested information for a complete application, the proponent's proposal will be deemed incomplete and shall not move forward.

(3) Petitions for emergency statewide amendments to the building code may be submitted at any time, in accordance with RCW 19.27.074 and chapter 34.05 RCW, and WAC 51-04-015 and 51-04-020.

The council may refer a proposed statewide amendment to one of the council standing committees for review and comment prior to council action in accordance with chapter 34.05 RCW.

(4) The council shall consider and take action on all proposed statewide amendments within the time frames required by chapter 19.27 RCW, RCW 34.05.330, and all other deadlines established by statute.

History

• Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 19-24-078, § 51-04-025, filed 12/2/19, effective 1/2/20. Statutory Authority: RCW 19.27.031, 19.27.074 and 19.27.035. WSR 17-03-123, § 51-04-025, filed 1/18/17, effective 2/18/17. Statutory Authority: RCW 19.27.035, 19.27.074 and chapters 19.27 and 34.05 RCW. WSR 07-15-043, § 51-04-025, filed 7/13/07, effective 8/13/07. Statutory Authority: RCW 19.27.035 and chapter 34.05 RCW. WSR 94-05-058, § 51-04-025, filed 2/10/94, effective 3/13/94. Statutory Authority: Chapters 19.27 and 34.05 RCW and 1989 c 348. WSR 90-02-108, § 51-04-025, filed 1/3/90, effective 2/3/90.

Wash. Admin. Code § 51-04-030 Policies for consideration of proposed local government residential amendments.

(1) All amendments to the building code, as adopted by cities and counties for implementation and enforcement in their respective jurisdictions, that apply to single and multifamily buildings as defined by RCW 19.27.015, shall be submitted to the council for approval.

(2) The council shall consider and approve or deny all proposed local government residential amendments to the state building code as presented to the council within ninety calendar days of receipt of a proposal, unless alternative scheduling is agreed to by the council and the proposing entity. Where a proposed local government residential amendment is modified upon adoption by the city or county legislative body, it shall be resubmitted to the council. Local government residential amendments shall not be effective until approved by the council and the local governing authority.

(3) All local government residential amendments to the building code that require council approval shall be submitted in writing to the council, by the authorized local code or elected official, prior to implementation and enforcement of the amendment by the local jurisdiction. All local amendments submitted for review shall be accompanied by findings of fact justifying the adoption of the local amendment in accordance with the five criteria noted below in this section.

(4) It is the policy of the council to encourage joint proposals for local government residential amendments from more than one jurisdiction. Local government residential amendments submitted to the council for approval shall be based on:

(a) Climatic conditions that are unique to the jurisdiction.

(b) Geologic or seismic conditions that are unique to the jurisdiction.

(c) Environmental impacts such as noise, dust, etc., that are unique to the jurisdiction.

(d) Life, health, or safety conditions that are unique to the local jurisdiction.

(e) Other special conditions that are unique to the jurisdiction.

| EXCEPTION: | Local government residential amendments to administrative provisions (departmental operational procedures) contained within the state building code need not be submitted to the council for review and approval provided that such amendments do not alter the construction requirements of those chapters. | | --- | --- |

(5) Appendices to the codes that affect single and multifamily residential buildings as defined by RCW 19.27.015 that are not adopted by the council shall be submitted to the council for consideration as local government residential amendments to the building code.

Local government residential amendments shall conform to the limitations provided in RCW 19.27.040.

History

• Statutory Authority: RCW 19.27.031, 19.27.074 and 19.27.035. WSR 17-03-123, § 51-04-030, filed 1/18/17, effective 2/18/17. Statutory Authority: RCW 19.27.035, 19.27.074 and chapters 19.27 and 34.05 RCW. WSR 07-15-043, § 51-04-030, filed 7/13/07, effective 8/13/07. Statutory Authority: RCW 19.27.190, 19.27.020, and chapters 19.27 and 34.05 RCW. WSR 05-23-104, § 51-04-030, filed 11/17/05, effective 1/1/06. Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 04-07-193, § 51-04-030, filed 3/24/04, effective 7/1/04. Statutory Authority: RCW 19.27.035 and 19.27.074. WSR 98-24-077, § 51-04-030, filed 12/1/98, effective 7/1/99. Statutory Authority: Chapter 19.27 RCW. WSR 95-01-127, § 51-04-030, filed 12/21/94, effective 6/30/95. Statutory Authority: Chapters 19.27 and 34.05 RCW and 1989 c 348. WSR 90-02-108, § 51-04-030, filed 1/3/90, effective 2/3/90.

Wash. Admin. Code § 51-04-035 Procedure for submittal of proposed local government residential amendments.

All proposed local government residential amendments to the state building code shall be submitted in writing to the council, on a form provided by the council, along with findings of fact as required in WAC 51-04-030 for the proposed amendment. Local government residential amendments to administrative provisions (departmental operational procedures) contained within the state building code need not be submitted to the council for review and approval provided that such amendment does not affect the construction requirements of those chapters.

The council shall accept and consider all applications for review of local government residential amendments submitted to the council in a proper manner.

The council may refer a proposed local government residential amendment to one of the council standing committees for review and comment prior to council action in accordance with RCW 19.27.074.

History

• Statutory Authority: RCW 19.27.190, 19.27.020, and chapters 19.27 and 34.05 RCW. WSR 05-23-104, § 51-04-035, filed 11/17/05, effective 1/1/06. Statutory Authority: Chapters 19.27 and 34.05 RCW and 1989 c 348. WSR 90-02-108, § 51-04-035, filed 1/3/90, effective 2/3/90.

Wash. Admin. Code § 51-04-037 Preapproved local government residential amendments.

Any local government residential amendment, that the council determines to be appropriate for adoption by other local governments, may be designated as a preapproved local government residential amendment.

A preapproved local government residential amendment may be adopted by any local government upon notification of the council.

History

• Statutory Authority: Chapters 19.27 and 34.05 RCW and 1989 c 348. WSR 90-02-108, § 51-04-037, filed 1/3/90, effective 2/3/90.

Wash. Admin. Code § 51-04-040 Reconsideration.

(1) When the council approves, denies or modifies a local amendment to the building code, any party with written or oral testimony to the council related to the amendment on the record may file a petition for reconsideration. The petition must be received by the Washington State Building Code Council, 1500 Jefferson Avenue S.E., P.O. Box 41449, Olympia, Washington 98504-1449, within twenty calendar days of the council action on the amendment. The petition must give specific reasons for why the council should reconsider the amendment for approval or denial.

(2) Within sixty calendar days of receipt of a timely petition for reconsideration, the council shall in writing:

(a) Grant the petition for reconsideration;

(b) Deny the petition for reconsideration, giving reasons for the denial; or

(c) Request additional information and extend the time period for not more than thirty calendar days to either grant or deny the petition for reconsideration.

(3) The council's denial of a local government amendment, or the council denial of a petition for reconsideration under this section, is subject to judicial review under chapter 34.05 RCW.

History

• Statutory Authority: RCW 19.27.035 and 19.27.074. WSR 21-01-049, § 51-04-040, filed 12/8/20, effective 1/8/21. Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 19-24-078, § 51-04-040, filed 12/2/19, effective 1/2/20. Statutory Authority: RCW 19.27.031, 19.27.074 and 19.27.035. WSR 17-03-123, § 51-04-040, filed 1/18/17, effective 2/18/17. Statutory Authority: RCW 19.27.074. WSR 16-01-042, § 51-04-040, filed 12/9/15, effective 1/9/16. Statutory Authority: RCW 19.27.035, 19.27.074 and chapters 19.27 and 34.05 RCW. WSR 07-15-043, § 51-04-040, filed 7/13/07, effective 8/13/07. Statutory Authority: RCW 19.27.190, 19.27.020, and chapters 19.27 and 34.05 RCW. WSR 05-23-104, § 51-04-040, filed 11/17/05, effective 1/1/06. Statutory Authority: RCW 19.27.035 and chapters 19.27 and 34.05 RCW. WSR 02-01-113, § 51-04-040, filed 12/18/01, effective 7/1/02. Statutory Authority: Chapters 19.27 and 34.05 RCW and 1989 c 348. WSR 90-02-108, § 51-04-040, filed 1/3/90, effective 2/3/90.

Wash. Admin. Code § 51-04-050 Ex parte communications.

All written communications related to council business received by council members shall be forwarded to staff for inclusion in the public record.

History

• Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 19-24-078, § 51-04-050, filed 12/2/19, effective 1/2/20. Statutory Authority: Chapters 19.27 and 34.05 RCW and 1989 c 348. WSR 90-02-108, § 51-04-050, filed 1/3/90, effective 2/3/90.

Wash. Admin. Code § 51-04-060 Opinions.

RCW 19.27.031 grants the council authority to render opinions relating to the building code at the request of a local code official.

For the purposes of this section, the term "code official" means the local or state official, or their designee, responsible for implementation and enforcement of the specific code provision on which the opinion is requested.

At the request of a code official, the council will issue opinions relating to the codes adopted under chapters 19.27, 19.27A, and 70.92 RCW, and council amendments to the model codes. At the request of a local code official, the council may issue opinions on the applicability of WAC 51-04-030 to a local government ordinance regulating construction.

Council related opinions may be developed and approved by a standing committee of the council.

Opinions approved by a standing committee may be reviewed and modified by the council.

History

• Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 19-24-078, § 51-04-060, filed 12/2/19, effective 1/2/20. Statutory Authority: RCW 19.27.035, 19.27.074 and chapters 19.27 and 34.05 RCW. WSR 07-15-043, § 51-04-060, filed 7/13/07, effective 8/13/07. Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 04-01-107, § 51-04-060, filed 12/17/03, effective 7/1/04. Statutory Authority: RCW 19.27.035 and 19.27.074. WSR 98-24-077, § 51-04-060, filed 12/1/98, effective 7/1/99. Statutory Authority: RCW 19.27.035 and chapter 34.05 RCW. WSR 94-05-058, § 51-04-060, filed 2/10/94, effective 3/13/94. Statutory Authority: Chapters 19.27 and 34.05 RCW and 1989 c 348. WSR 90-02-108, § 51-04-060, filed 1/3/90, effective 2/3/90.

Wash. Admin. Code § 51-04-070 Council mailing address.

All requests for information, documentation, etc., should be submitted to:

Washington State Building Code Council

1500 Jefferson Avenue S.E.

P.O. Box 41449

Olympia, Washington 98504-1449

Phone: 360-407-9255

www.sbcc.wa.gov

History

• Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 19-24-078, § 51-04-070, filed 12/2/19, effective 1/2/20. Statutory Authority: RCW 19.27.074. WSR 16-01-042, § 51-04-070, filed 12/9/15, effective 1/9/16. Statutory Authority: RCW 19.27.190, 19.27.020, and chapters 19.27 and 34.05 RCW. WSR 05-23-104, § 51-04-070, filed 11/17/05, effective 1/1/06. Statutory Authority: RCW 19.27.074. WSR 98-02-048, § 51-04-070, filed 1/5/98, effective 7/1/98. Statutory Authority: Chapters 19.27 and 34.05 RCW and 1989 c 348. WSR 90-02-108, § 51-04-070, filed 1/3/90, effective 2/3/90.

Chapter 51-05 State Building Code—Building permit surcharges and fees.

Wash. Admin. Code § 51-05-100 Purpose.

The purpose of these rules is to provide definitions to assist the collection of building permit fees as mandated by chapter 19.27 RCW.

History

• Statutory Authority: RCW 19.27.074, 19.27.020, 19.27.031 and 19.27.085. WSR 14-10-067, recodified as § 51-05-100, filed 5/6/14, effective 6/6/14. Statutory Authority: Chapters 19.27 and 19.27A RCW. WSR 90-09-008 (Order 90-01), § 365-110-020, filed 4/6/90, effective 5/7/90. Statutory Authority: RCW 19.27.085, 19.27A.040, 43.63A.060, 43.63A.065 and 1987 1st ex.s. c 7 § 217(14). WSR 87-19-110 (Order 87-19), § 365-110-020, filed 9/18/87. Statutory Authority: 1985 c 144 and 360, 1985 1st ex.s. c 6, RCW 43.63A.060 and 43.63A.065. WSR 85-19-042 (Order 85-10), § 365-110-020, filed 9/13/85.

Wash. Admin. Code § 51-05-200 Definitions.

1. State Building Code fee shall mean a fee which is required to be collected by cities and counties pursuant to chapter 19.27 RCW. Funds collected shall be used exclusively to implement the provisions of chapters 19.27 and 19.27A RCW.

2. Building permit shall mean a permit issued by a city or a county to construct, enlarge, alter, repair, move, demolish, or change the occupancy of any building or structure regulated by the International Building Code as set forth in the International Building Code, section 105.1 or by the International Residential Code as set forth in the International Residential Code, section R105.1. This definition shall be subject to the exemptions contained in section 105.2 of the International Building Code and section R105.2 of the International Residential Code. Building permits shall not include plumbing, electrical, mechanical permits, or permits issued pursuant to the International Fire Code.

History

• Statutory Authority: RCW 19.27.074, 19.27.020, 19.27.031 and 19.27.085. WSR 14-10-067, amended and recodified as § 51-05-200, filed 5/6/14, effective 6/6/14. Statutory Authority: RCW 43.330.040(2) and 19.27.070(3). WSR 99-01-089, § 365-110-035, filed 12/16/98, effective 1/16/99. Statutory Authority: Chapters 19.27 and 19.27A RCW. WSR 90-09-008 (Order 90-01), § 365-110-035, filed 4/6/90, effective 5/7/90. Statutory Authority: RCW 19.27.085, 19.27A.040, 43.63A.060, 43.63A.065 and 1987 1st ex.s. c 7 § 217(14). WSR 87-19-110 (Order 87-19), § 365-110-035, filed 9/18/87. Statutory Authority: 1985 c 144 and 360, 1985 1st ex.s. c 6, RCW 43.63A.060 and 43.63A.065. WSR 85-19-042 (Order 85-10), § 365-110-035, filed 9/13/85.

Chapter 51-06 Public records.

Wash. Admin. Code § 51-06-010 Purpose of chapter.

The purpose of this chapter shall be to ensure compliance by the state building code council (hereinafter referred to as the "council"), including its members and staff, with the provisions of chapter 42.17 RCW, and in particular with RCW 42.17.250 - 42.17.320 dealing with public records.

History

• Statutory Authority: RCW 19.27.074. WSR 16-01-042, § 51-06-010, filed 12/9/15, effective 1/9/16. Statutory Authority: Chapters 19.27 and 34.05 RCW and 1989 c 348. WSR 90-02-108, § 51-06-010, filed 1/3/90, effective 2/3/90
• Order 76-02, § 51-06-010, filed 9/1/76.

Wash. Admin. Code § 51-06-020 Public records available.

All public records of the council as defined in WAC 51-06-030 are available for public inspection and copying at the Washington State Building Code Council, 1500 Jefferson Avenue S.E., Olympia, Washington 98504-1449, pursuant to these rules, except as otherwise provided by RCW 42.17.310.

History

• Statutory Authority: RCW 19.27.074. WSR 16-01-042, § 51-06-020, filed 12/9/15, effective 1/9/16
• WSR 98-02-049, § 51-06-020, filed 1/5/98, effective 7/1/98. Statutory Authority: Chapters 19.27 and 34.05 RCW and 1989 c 348. WSR 90-02-108, § 51-06-020, filed 1/3/90, effective 2/3/90
• Order 76-02, § 51-06-020, filed 9/1/76.

Wash. Admin. Code § 51-06-070 Copying.

The department of community development may charge a fee of twenty-five cents per page for providing copies of public records and for use of the office's copy equipment.

History

• Statutory Authority: Chapters 19.27 and 34.05 RCW and 1989 c 348. WSR 90-02-108, § 51-06-070, filed 1/3/90, effective 2/3/90
• Order 76-02, § 51-06-070, filed 9/1/76.

Wash. Admin. Code § 51-06-120 Address for communications.

All requests for information, documentation, etc., should be submitted to the:

Washington State Building Code Council

1500 Jefferson Avenue S.E.

P.O. Box 41449

Olympia, Washington 98504-1449

Phone: 360-407-9280

Fax: 360-586-9088

History

• Statutory Authority: RCW 19.27.074. WSR 16-01-042, § 51-06-120, filed 12/9/15, effective 1/9/16
• WSR 98-02-049, § 51-06-120, filed 1/5/98, effective 7/1/98. Statutory Authority: Chapters 19.27 and 34.05 RCW and 1989 c 348. WSR 90-02-108, § 51-06-120, filed 1/3/90, effective 2/3/90
• Order 76-02, § 51-06-120, filed 9/1/76.

Chapter 51-11C State Building Code adoption and amendment of the 2021 edition of the International Energy Conservation Code, Commercial.

Wash. Admin. Code § 51-11C-10000 Chapter 1 CE—Scope and administration.

Reviser's note: The brackets and enclosed material in the text of the above section occurred in the copy filed by the agency.

Wash. Admin. Code § 51-11C-10100 Section C101—Scope and general requirements.

C101.1 Title. This code shall be known as the Washington State Energy Code, and shall be cited as such. It is referred to herein as "this code."

The 2021 edition of the Washington State Energy Code is hereby adopted. The Washington State Energy Code adopted under chapter 51-11C WAC shall become effective in all counties and cities of this state on March 15, 2024.

C101.2 Scope. This code applies to commercial buildings and the buildings sites and associated systems and equipment. References in this code to Group R shall include Group I-1, Condition 2 assisted living facilities licensed by Washington state under chapter 388-78A WAC and Group I-1, Condition 2 residential treatment facilities licensed by Washington state under chapter 246-337 WAC. Building areas that contain Group R sleeping units, regardless of the number of stories in height, are required to comply with the commercial sections of the energy code.

| EXCEPTION: | The provisions of this code do not apply to temporary growing structures used solely for the commercial production of horticultural plants including ornamental plants, flowers, vegetables, and fruits. A temporary growing structure is not considered a building for the purposes of this code. However, the installation of other than listed, portable mechanical equipment or listed, portable lighting fixtures is not allowed. | | --- | --- |

C101.3 Intent. This code shall regulate the design and construction of buildings for the use and conservation of energy over the life of each building. This code is intended to provide flexibility to permit the use of innovative approaches and techniques to achieve this objective. This code is not intended to abridge safety, health or environmental requirements contained in other applicable codes or ordinances.

History

• Statutory Authority: RCW 19.27A.020, 19.27A.025, 19.27A.160, chapters 19.27A and 19.27 RCW. WSR 24-03-085, § 51-11C-10100, filed 1/16/24, effective 3/15/24
• WSR 22-14-091, 23-12-101, and 23-20-021, § 51-11C-10100, filed 7/1/22, 6/7/23, and 9/25/23, effective 3/15/24. Statutory Authority: RCW 19.27A.020, 19.27A.025, 19.27A.160 and chapter 19.27 RCW. WSR 19-24-040, § 51-11C-10100, filed 11/26/19, effective 7/1/20. Statutory Authority: RCW 19.27A.025, 19.27A.045, and chapters 19.27, 19.27A, and 34.05 RCW. WSR 17-17-162, § 51-11C-10100, filed 8/23/17, effective 10/1/17. Statutory Authority: RCW 19.27A.025, 19.27A.160, and 19.27.074. WSR 16-03-072, § 51-11C-10100, filed 1/19/16, effective 7/1/16. Statutory Authority: RCW 19.27A.020, 19.27A.025 and chapters 19.27 and 34.05 RCW. WSR 13-04-056, § 51-11C-10100, filed 2/1/13, effective 7/1/13.

Wash. Admin. Code § 51-11C-10140 Section C101.4—Applicability.

C101.4 Applicability. Where, in any specific case, different sections of this code specify different materials, methods of construction or other requirements, the most restrictive shall govern. Where there is a conflict between a general requirement and a specific requirement, the specific requirement shall govern.

C101.4.1Mixed residential and commercial buildings. Where a building includes both residential building and commercialbuilding portions, each portion shall be separately considered and meet the applicable provisions of WSEC—Commercial Provisions or WSEC—Residential Provisions.

History

• Statutory Authority: RCW 19.27A.020, 19.27A.025, 19.27A.160 and chapter 19.27 RCW. WSR 19-24-040, § 51-11C-10140, filed 11/26/19, effective 7/1/20. Statutory Authority: RCW 19.27A.025, 19.27A.160, and 19.27.074. WSR 16-03-072, § 51-11C-10140, filed 1/19/16, effective 7/1/16. Statutory Authority: RCW 19.27A.025, 19.27A.045, 19.27.020, and 19.27.074. WSR 14-24-122, § 51-11C-10140, filed 12/3/14, effective 1/3/15. Statutory Authority: RCW 19.27A.025, 19.27A.045, and 19.27.074. WSR 13-20-120, § 51-11C-10140, filed 10/1/13, effective 11/1/13. Statutory Authority: RCW 19.27A.020, 19.27A.025 and chapters 19.27 and 34.05 RCW. WSR 13-04-056, § 51-11C-10140, filed 2/1/13, effective 7/1/13.

Wash. Admin. Code § 51-11C-10143 Reserved.

History

• Statutory Authority: RCW 19.27A.025, 19.27A.160, and 19.27.074. WSR 16-03-072, § 51-11C-10143, filed 1/19/16, effective 7/1/16. Statutory Authority: RCW 19.27A.025, 19.27A.045, and 19.27.074. WSR 13-20-120, § 51-11C-10143, filed 10/1/13, effective 11/1/13. Statutory Authority: RCW 19.27A.020, 19.27A.025 and chapters 19.27 and 34.05 RCW. WSR 13-04-056, § 51-11C-10143, filed 2/1/13, effective 7/1/13.

Wash. Admin. Code § 51-11C-10150 Section C101.5—Compliance.

C101.5 Compliance.Residential buildings shall meet the provisions of WSEC—Residential Provisions. Commercial buildings shall meet the provisions of WSEC—Commercial Provisions.

C101.5.1 Compliance materials. The code official shall be permitted to approve specific computer software, worksheets, compliance manuals and other similar materials that meet the intent of this code.

C101.6 Appendices. Appendices A, B, C, and D are included in the adoption of this code. Provisions in Appendices E and F shall not apply unless specifically adopted by the local jurisdiction.

History

• Statutory Authority: RCW 19.27A.020, 19.27A.025, 19.27A.160 and chapter 19.27 RCW. WSR 19-24-040, § 51-11C-10150, filed 11/26/19, effective 7/1/20. Statutory Authority: RCW 19.27A.025, 19.27A.160, and 19.27.074. WSR 16-03-072, § 51-11C-10150, filed 1/19/16, effective 7/1/16. Statutory Authority: RCW 19.27A.020, 19.27A.025 and chapters 19.27 and 34.05 RCW. WSR 13-04-056, § 51-11C-10150, filed 2/1/13, effective 7/1/13.

Wash. Admin. Code § 51-11C-10200 Section C102—Alternative materials, design and methods of construction and equipment.

C102.1 General. The provisions of this code are not intended to prevent the installation of any material, or to prohibit any design or method of construction not specifically prescribed by this code, provided that any such alternative has been approved. The code official shall have the authority to approve an alternate material, design or method of construction upon the written application of the owner or the owner's authorized agent. The code official shall first find that the proposed design is satisfactory and complies with the intent of the provisions of this code, and that the material, method or work offered is, for the purpose intended, not less than the equivalent of that prescribed in this code in quality, strength, effectiveness, fire resistance, durability, energy conservation, and safety. The code official shall respond to the applicant, in writing, stating the reasons why the alternative was approved or was not approved.

History

• Statutory Authority: RCW 19.27A.020, 19.27A.025, 19.27A.160 and chapters 19.27A and 19.27 RCW. WSR 22-14-091, 23-12-101, and 23-20-021, § 51-11C-10200, filed 7/1/22, 6/7/23, and 9/25/23, effective 3/15/24. Statutory Authority: RCW 19.27A.020, 19.27A.025, 19.27A.160 and chapter 19.27 RCW. WSR 19-24-040, § 51-11C-10200, filed 11/26/19, effective 7/1/20. Statutory Authority: RCW 19.27A.020, 19.27A.025 and chapters 19.27 and 34.05 RCW. WSR 13-04-056, § 51-11C-10200, filed 2/1/13, effective 7/1/13.

Wash. Admin. Code § 51-11C-10300 Section C103—Construction documents.

C103.1 General. Construction documents and other supporting data shall be submitted in one or more sets, or in a digital format where allowed by the building official, with each application for a permit. The construction documents shall be prepared by a registered design professional where required by the statutes of the jurisdiction in which the project is to be constructed. Where special conditions exist, the code official is authorized to require necessary construction documents to be prepared by a registered design professional.

| EXCEPTION: | The code official is authorized to waive the requirements for construction documents or other supporting data if the code official determines they are not necessary to confirm compliance with this code. | | --- | --- |

C103.2 Information on construction documents. Construction documents shall be drawn to scale upon suitable material. Electronic media documents are permitted to be submitted when approved by the code official. Construction documents shall be of sufficient clarity to indicate the location, nature and extent of the work proposed, and show in sufficient detail pertinent data and features of the building, systems and equipment as herein governed. Details shall include, but are not limited to, as applicable:

1. Energy compliance path per Section C401 or C501.

2. Insulation materials and their R-values.

3. Fenestration U-factors and SHGCs.

4. Area-weighted U-factor and SHGC calculations.

5. Mechanical system design criteria.

6. Mechanical and service water heating system and equipment types, sizes and efficiencies.

7. Economizer description.

8. Equipment and systems controls.

9. Fan motor horsepower (hp) and controls.

10. Duct sealing, duct and pipe insulation and location.

11. Lighting fixture schedule with wattage and control narrative.

12. Location of daylight zones on floor plan.

13. Air barrier details including all air barrier boundaries and associated square foot calculations on all six sides of the air barrier as applicable.

C103.2.1 Building thermal envelope depiction. The building's thermal envelope shall be represented on the construction documents.

C103.3 Examination of documents. The code official shall examine or cause to be examined the accompanying construction documents and shall ascertain whether the construction indicated and described is in accordance with the requirements of this code and other pertinent laws or ordinances.

C103.3.1 Approval of construction documents. When the code official issues a permit where construction documents are required, the construction documents shall be endorsed in writing and stamped "Reviewed for Code Compliance." Such approved construction documents shall not be changed, modified or altered without authorization from the code official. Work shall be done in accordance with the approved construction documents.

One set of construction documents so reviewed shall be retained by the code official. The other set shall be returned to the applicant, kept at the site of work and shall be open to inspection by the code official or a duly authorized representative.

C103.3.2 Previous approvals. This code shall not require changes in the construction documents, construction or designated occupancy of a structure for which a lawful permit has been heretofore issued or otherwise lawfully authorized, and the construction of which has been pursued in good faith within 180 days after the effective date of this code and has not been abandoned.

C103.3.3 Phased approval. The code official shall have the authority to issue a permit for the construction of part of an energy conservation system before the construction documents for the entire system have been submitted or approved, provided adequate information and detailed statements have been filed complying with all pertinent requirements of this code. The holders of such permit shall proceed at their own risk without assurance that the permit for the entire energy conservation system will be granted.

C103.4 Amended construction documents. Changes made during construction that are not in compliance with the approved construction documents shall be resubmitted for approval as an amended set of construction documents.

C103.5 Retention of construction documents. One set of approved construction documents shall be retained by the code official for a period of not less than 180 days from date of completion of the permitted work, or as required by state or local laws.

C103.6 Building documentation and close out submittal requirements. The construction documents shall specify that the documents described in this section be provided to the building owner or owner's authorized agent within a maximum of 90 days of the date of receipt of the certificate of occupancy.

C103.6.1 Record documents. Construction documents shall be updated by the installing contractor and architect or engineer of record to convey a record of the completed work. Such updates shall include building envelope, mechanical, plumbing, electrical and control drawings red-lined, or redrawn if specified, that show all changes to size, type and locations of components, equipment and assemblies. Record documents shall include the location and model number of each piece of equipment as installed. The architect, engineer of record or installing contractor is required to provide consolidated record drawings in compliance with this section to the building owner or owner's authorized agent with the timeline specified in Section C103.6.

C103.6.2 Building operations and maintenance information. Required regular maintenance actions for equipment and systems shall be clearly stated on a readily visible label on the equipment. The label shall include the title or publication number for the operation and maintenance manual for that particular model and type of product and the manufacture date or installation date.

C103.6.2.1 Manuals. An operating and maintenance manual shall be provided for each component, device, piece of equipment, and system governed by this code. The manual shall include all of the following:

1. Submittal data indicating all selected options for each piece of equipment and control devices.

2. Manufacturer's operation manuals and maintenance manuals for each device, piece of equipment, and system requiring maintenance, except equipment not furnished as part of the project. Required routine maintenance actions, cleaning and recommended relamping shall be clearly identified.

3. Name and address of at least one service agency.

4. Controls system inspection schedule, maintenance and calibration information, wiring diagrams, schematics, and control sequence descriptions. A schedule for inspecting and recalibrating all lighting controls. Desired or field-determined setpoints shall be permanently recorded on control drawings at control devices or, for digital control systems, on the graphic where settings may be changed.

5. A narrative of how each system is intended to operate, including recommended setpoints. Sequence of operation alone is not acceptable for this requirement.

C103.6.3 Compliance documentation. All energy code compliance forms and calculations shall be delivered in one document to the building owner as part of the project record documents or manuals, or as a standalone document. This document shall include the specific energy code year utilized for compliance determination for each system. NFRC certificates for the installed windows, list of total area for each NFRC certificate, the interior lighting power compliance path (building area, space-by-space) used to calculate the lighting power allowance.

For projects complying with Section C401.2 Item 1, the documentation shall include:

1. The envelope insulation compliance path (prescriptive or component performance).

2. All completed code compliance forms, and all compliance calculations including, but not limited to, those required by sections C402.1.5, C403.2.12.1, C405.4, and C405.5.

For projects complying with Section C401.2 Item 2, the documentation shall include:

1. A list of all proposed envelope component types, areas and U-values.

2. A list of all lighting area types with areas, lighting power allowance, and installed lighting power density.

3. A list of each HVAC system modeled with the assigned and proposed system type.

4. Electronic copies of the baseline and proposed model input and output file. The input files shall be in a format suitable for rerunning the model and shall not consist solely of formatted reports of the inputs.

C103.6.4 Systems operation training. Training of the maintenance staff for equipment included in the manuals required by Section C103.6.2 shall include at a minimum:

1. Review of manuals and permanent certificate.

2. Hands-on demonstration of all normal maintenance procedures, normal operating modes, and all emergency shutdown and start-up procedures.

3. Training completion report.

History

• Statutory Authority: RCW 19.27A.020, 19.27A.025, 19.27A.160 and chapters 19.27A and 19.27 RCW. WSR 22-14-091, 23-12-101, and 23-20-021, § 51-11C-10300, filed 7/1/22, 6/7/23, and 9/25/23, effective 3/15/24. Statutory Authority: RCW 19.27A.020, 19.27A.025, 19.27A.160 and chapter 19.27 RCW. WSR 19-24-040, § 51-11C-10300, filed 11/26/19, effective 7/1/20. Statutory Authority: RCW 19.27A.025, 19.27A.045, 19.27A.160, and 19.27.074. WSR 16-24-070, § 51-11C-10300, filed 12/6/16, effective 5/1/17
• WSR 16-13-089, § 51-11C-10300, filed 6/15/16, effective 7/16/16. Statutory Authority: RCW 19.27A.025, 19.27A.160, and 19.27.074. WSR 16-03-072, § 51-11C-10300, filed 1/19/16, effective 7/1/16. Statutory Authority: RCW 19.27A.020, 19.27A.025 and chapters 19.27 and 34.05 RCW. WSR 13-04-056, § 51-11C-10300, filed 2/1/13, effective 7/1/13.

Wash. Admin. Code § 51-11C-10400 Section C104—Fees.

C104.1 Fees. A permit shall not be issued until the fees prescribed in Section C104.2 have been paid, nor shall an amendment to a permit be released until the additional fee, if any, has been paid.

C104.2 Schedule of permit fees. A fee for each permit shall be paid as required, in accordance with the schedule as established by the applicable governing authority.

C104.3 Work commencing before permit issuance. Any person who commences any work before obtaining the necessary permits shall be subject to an additional fee established by the code official, which shall be in addition to the required permit fees.

C104.4 Related fees. The payment of the fee for the construction, alteration, removal or demolition of work done in connection to or concurrently with the work or activity authorized by a permit shall not relieve the applicant or holder of the permit from the payment of other fees that are prescribed by law.

C104.5 Refunds. The code official is authorized to establish a refund policy.

History

• Statutory Authority: RCW 19.27A.020, 19.27A.025, 19.27A.160 and chapters 19.27A and 19.27 RCW. WSR 22-14-091, 23-12-101, and 23-20-021, § 51-11C-10400, filed 7/1/22, 6/7/23, and 9/25/23, effective 3/15/24. Statutory Authority: RCW 19.27A.020, 19.27A.025, 19.27A.160 and chapter 19.27 RCW. WSR 19-24-040, § 51-11C-10400, filed 11/26/19, effective 7/1/20. Statutory Authority: RCW 19.27A.025, 19.27A.045, 19.27A.160, and 19.27.074. WSR 16-24-070, § 51-11C-10400, filed 12/6/16, effective 5/1/17. Statutory Authority: RCW 19.27A.025, 19.27A.160, and 19.27.074. WSR 16-03-072, § 51-11C-10400, filed 1/19/16, effective 7/1/16. Statutory Authority: RCW 19.27A.025, 19.27A.045, 19.27.020, and 19.27.074. WSR 14-24-122, § 51-11C-10400, filed 12/3/14, effective 1/3/15. Statutory Authority: RCW 19.27A.020, 19.27A.025 and chapters 19.27 and 34.05 RCW. WSR 13-04-056, § 51-11C-10400, filed 2/1/13, effective 7/1/13.

Wash. Admin. Code § 51-11C-10500 Section C105—Inspections.

C105.1 General. Construction or work for which a permit is required shall be subject to inspection by the code official, his or her designated agent, or an approved agency, and such construction or work shall remain visible and able to be accessed for inspection purposes until approved. Approval as a result of an inspection shall not be construed to be an approval of a violation of the provisions of this code or of other ordinances of the jurisdiction. Inspections presuming to give authority to violate or cancel the provisions of this code or of other ordinances of the jurisdiction shall not be valid. It shall be the duty of the permit applicant to cause the work to remain visible and able to be accessed for inspection purposes. Neither the code official nor the jurisdiction shall be liable for expense entailed in the removal or replacement of any material, product, system or building component required to allow inspection to validate compliance with this code.

C105.2 Required inspections. The code official, his or her designated agent, or an approved agency, upon notification, shall make the inspections set forth in Sections C105.2.1 through C105.2.6.

C105.2.1 Footing and foundation insulation. Inspections shall verify footing and/or foundation insulation R-value, location, thickness, depth of burial and protection of insulation as required by the code, approved plans and specifications.

C105.2.2 Thermal envelope. Inspections shall be made before application of interior finish and shall verify that envelope components with the correct type of insulation, the R-values, the correct location of insulation, the correct fenestration, the U-factor, SHGC, VT, and air leakage controls are properly installed as required by the code, approved plans and specifications, including envelope components in future tenant spaces of multitenant buildings.

C105.2.3 Plumbing system. Inspections shall verify the type of insulation, the R-values, the protection required, controls, and heat traps as required by the code, approved plans and specifications.

C105.2.4 Mechanical system. Inspections shall verify the installed HVAC equipment for the correct type and size, controls, duct and piping insulation R-values, duct system and damper air leakage, minimum fan efficiency, energy recovery and economizer as required by the code, approved plans and specifications.

C105.2.5 Electrical system. Inspections shall verify lighting system controls, components, meters, motors and installation of an electric meter for each dwelling unit as required by the code, approved plans and specifications.

C105.2.6 Final inspection. The final inspection shall include verification of the installation and proper operation of all required building controls, and documentation verifying activities associated with required building commissioning have been conducted in accordance with Section C408.

C105.3 Reinspection. A building shall be reinspected when determined necessary by the code official.

C105.4 Approved inspection agencies. The code official is authorized to accept reports of approved inspection agencies, provided such agencies satisfy the requirements as to qualifications and reliability relevant to the building components and systems they are inspecting.

C105.5 Inspection requests. It shall be the duty of the holder of the permit or their duly authorized agent to notify the code official when work is ready for inspection. It shall be the duty of the permit holder to provide access to and means for inspections of such work that are required by this code.

C105.6 Reinspection and testing. Where any work or installation does not pass an initial test or inspection, the necessary corrections shall be made so as to achieve compliance with this code. The work or installation shall then be resubmitted to the code official for inspection and testing.

History

• Statutory Authority: RCW 19.27A.020, 19.27A.025, 19.27A.160 and chapters 19.27A and 19.27 RCW. WSR 22-14-091, 23-12-101, and 23-20-021, § 51-11C-10500, filed 7/1/22, 6/7/23, and 9/25/23, effective 3/15/24. Statutory Authority: RCW 19.27A.020, 19.27A.025 and chapters 19.27 and 34.05 RCW. WSR 13-04-056, § 51-11C-10500, filed 2/1/13, effective 7/1/13.

Wash. Admin. Code § 51-11C-10600 Section C106—Notice of approval.

C106.1 Approval. After the prescribed tests and inspections indicate that the work complies in all respects with this code, a notice of approval shall be issued by the code official.

C106.2 Revocation. The code official is authorized to, in writing, suspend or revoke a notice of approval issued under the provisions of this code wherever the certificate is issued in error, or on the basis of incorrect information supplied, or where it is determined that the building or structure, premise, or portion thereof is in violation of any ordinance or regulation or any of the provisions of this code.

History

• Statutory Authority: RCW 19.27A.020, 19.27A.025, 19.27A.160 and chapters 19.27A and 19.27 RCW. WSR 22-14-091, 23-12-101, and 23-20-021, § 51-11C-10600, filed 7/1/22, 6/7/23, and 9/25/23, effective 3/15/24. Statutory Authority: RCW 19.27A.025, 19.27A.160, and 19.27.074. WSR 16-03-072, § 51-11C-10600, filed 1/19/16, effective 7/1/16. Statutory Authority: RCW 19.27A.020, 19.27A.025 and chapters 19.27 and 34.05 RCW. WSR 13-04-056, § 51-11C-10600, filed 2/1/13, effective 7/1/13.

Wash. Admin. Code § 51-11C-10700 Section C107—Validity.

C107.1 General. If a portion of this code is held to be illegal or void, such a decision shall not affect the validity of the remainder of this code.

History

• Statutory Authority: RCW 19.27A.020, 19.27A.025, 19.27A.160 and chapters 19.27A and 19.27 RCW. WSR 22-14-091, 23-12-101, and 23-20-021, § 51-11C-10700, filed 7/1/22, 6/7/23, and 9/25/23, effective 3/15/24. Statutory Authority: RCW 19.27A.020, 19.27A.025 and chapters 19.27 and 34.05 RCW. WSR 13-04-056, § 51-11C-10700, filed 2/1/13, effective 7/1/13.

Wash. Admin. Code § 51-11C-10800 Section C108—Referenced standards.

C108.1 Referenced codes and standards. The codes and standards referenced in this code shall be those listed in Chapter 6, and such codes and standards shall be considered as part of the requirements of this code to the prescribed extent of each such reference and as further regulated in Sections C108.1.1 and C108.1.2.

C108.1.1 Conflicts. Where differences occur between provisions of this code and referenced codes and standards, the provisions of this code shall apply.

C108.1.2 Provisions in referenced codes and standards. Where the extent of the reference to a referenced code or standard includes subject matter that is within the scope of this code, the provisions of this code, as applicable, shall take precedence over the provisions in the referenced code or standard.

C108.2 Application of references. References to chapter or section numbers, or to provisions not specifically identified by number, shall be construed to refer to such chapter, section, or provision of this code.

C108.3 Other laws. The provisions of this code shall not be deemed to nullify any provisions of local, state, or federal law. In addition to the requirements of this code, all occupancies shall conform to the provisions included in the State Building Code (chapter 19.27 RCW). In case of conflicts among the codes enumerated in RCW 19.27.031 (1) through (4) and this code, an earlier named code shall govern over those following. In the case of conflict between the duct sealing and insulation requirements of this code and the duct insulation requirements of Sections 603 and 604 of the International Mechanical Code, the duct insulation requirements of this code, or where applicable, a local jurisdiction's energy code shall govern.

History

• Statutory Authority: RCW 19.27A.020, 19.27A.025, 19.27A.160, chapters 19.27A and 19.27 RCW. WSR 24-03-085, § 51-11C-10800, filed 1/16/24, effective 3/15/24
• WSR 22-14-091, 23-12-101, and 23-20-021, § 51-11C-10800, filed 7/1/22, 6/7/23, and 9/25/23, effective 3/15/24. Statutory Authority: RCW 19.27A.025, 19.27A.160, and 19.27.074. WSR 16-03-072, § 51-11C-10800, filed 1/19/16, effective 7/1/16. Statutory Authority: RCW 19.27A.020, 19.27A.025 and chapters 19.27 and 34.05 RCW. WSR 13-04-056, § 51-11C-10800, filed 2/1/13, effective 7/1/13.

Wash. Admin. Code § 51-11C-10900 Section C109—Stop work order.

C109.1 Authority. Whenever the code official finds any work regulated by this code being performed in a manner either contrary to the provisions of this code or dangerous or unsafe, the code official is authorized to issue a stop work order.

C109.2 Issuance. The stop work order shall be in writing and shall be given to the owner of the property involved, or to the owner's agent, or to the person doing the work. Upon issuance of a stop work order, the cited work shall immediately cease. The stop work order shall state the reason for the order, and the conditions under which the cited work will be permitted to resume.

C109.3 Emergencies. Where an emergency exists, the code official shall not be required to give a written notice prior to stopping the work.

C109.4 Failure to comply. Any person who shall continue any work after having been served with a stop work order, except such work as that person is directed to perform to remove a violation or unsafe condition, shall be liable to a fine as set by the applicable governing authority.

History

• Statutory Authority: RCW 19.27A.020, 19.27A.025, 19.27A.160 and chapters 19.27A and 19.27 RCW. WSR 22-14-091, 23-12-101, and 23-20-021, § 51-11C-10900, filed 7/1/22, 6/7/23, and 9/25/23, effective 3/15/24. Statutory Authority: RCW 19.27A.020, 19.27A.025 and chapters 19.27 and 34.05 RCW. WSR 13-04-056, § 51-11C-10900, filed 2/1/13, effective 7/1/13.

Wash. Admin. Code § 51-11C-11000 Section C110—Board of appeals.

C110.1 General. In order to hear and decide appeals of orders, decisions or determinations made by the code official relative to the application and interpretation of this code, there shall be and is hereby created a board of appeals. The code official shall be an ex officio member of said board but shall have no vote on any matter before the board. The board of appeals shall be appointed by the governing body and shall hold office at its pleasure. The board shall adopt rules of procedure for conducting its business, and shall render all decisions and findings in writing to the appellant with a duplicate copy to the code official.

C110.2 Limitations on authority. An application for appeal shall be based on a claim that the true intent of this code or the rules legally adopted thereunder have been incorrectly interpreted, the provisions of this code do not fully apply or an equally good or better form of construction is proposed. The board shall have no authority to waive requirements of this code.

C110.3 Qualifications. The board of appeals shall consist of members who are qualified by experience and training and are not employees of the jurisdiction.

History

• Statutory Authority: RCW 19.27A.020, 19.27A.025, 19.27A.160 and chapters 19.27A and 19.27 RCW. WSR 22-14-091, 23-12-101, and 23-20-021, § 51-11C-11000, filed 7/1/22, 6/7/23, and 9/25/23, effective 3/15/24. Statutory Authority: RCW 19.27A.020, 19.27A.025 and chapters 19.27 and 34.05 RCW. WSR 13-04-056, § 51-11C-11000, filed 2/1/13, effective 7/1/13.

Wash. Admin. Code § 51-11C-11100 Section C111—Violations.

It shall be unlawful for any person, firm, or corporation to erect or construct any building, or remodel or rehabilitate any existing building or structure in the state, or allow the same to be done, contrary to or in violation of any of the provisions of this code.

History

• Statutory Authority: RCW 19.27A.020, 19.27A.025, 19.27A.160 and chapters 19.27A and 19.27 RCW. WSR 22-14-091, 23-12-101, and 23-20-021, § 51-11C-11100, filed 7/1/22, 6/7/23, and 9/25/23, effective 3/15/24. Statutory Authority: RCW 19.27A.020, 19.27A.025 and chapters 19.27 and 34.05 RCW. WSR 13-04-056, § 51-11C-11100, filed 2/1/13, effective 7/1/13.

Wash. Admin. Code § 51-11C-11200 Section C112—Liability.

Nothing contained in this code is intended to be nor shall be construed to create or form the basis for any liability on the part of any city or county or its officers, employees, or agents for any injury or damage resulting from the failure of a building to conform to the provisions of this code.

History

• Statutory Authority: RCW 19.27A.020, 19.27A.025, 19.27A.160 and chapters 19.27A, 19.27 RCW. WSR 22-14-091, 23-12-101, and 23-20-021, § 51-11C-11200, filed 7/1/22, 6/7/23, and 9/25/23, effective 3/15/24.

Wash. Admin. Code § 51-11C-20000 Chapter 2 CE—Definitions.

Reviser's note: The brackets and enclosed material in the text of the above section occurred in the copy filed by the agency.

Wash. Admin. Code § 51-11C-20100 Section C201—General.

C201.1 Scope. Unless stated otherwise, the following words and terms in this code shall have the meanings indicated in this chapter.

C201.2 Interchangeability. Words used in the present tense include the future; words in the masculine gender include the feminine and neuter; the singular number includes the plural and the plural includes the singular.

C201.3 Terms defined in other codes. Terms that are not defined in this code but are defined in the International Building Code, International Fire Code, International Fuel Gas Code, International Mechanical Code, Uniform Plumbing Code or the International Residential Code shall have the meanings ascribed to them in those codes.

C201.4 Terms not defined. Terms not defined by this chapter shall have ordinarily accepted meanings such as the context implies.

History

• Statutory Authority: RCW 19.27A.020, 19.27A.025 and chapters 19.27 and 34.05 RCW. WSR 13-04-056, § 51-11C-20100, filed 2/1/13, effective 7/1/13.

Wash. Admin. Code § 51-11C-20200 Section C202—General definitions.

History

• Statutory Authority: RCW 19.27A.020, 19.27A.025 and chapters 19.27 and 34.05 RCW. WSR 13-04-056, § 51-11C-20200, filed 2/1/13, effective 7/1/13.

Wash. Admin. Code § 51-11C-20201 Section C202.1—A.

ABOVE-GRADE WALL. That portion of a wall in the building envelope that is not a below-grade wall. This includes between-floor spandrels, peripheral edges of floors, roof knee walls, dormer walls, gable end walls, walls enclosing a mansard roof and skylight shafts.

ACCESS (TO). That which enables a device, appliance or equipment to be reached by ready access or by a means that first requires the removal or movement of a panel or similar obstruction.

ADDITION. An extension or increase in the conditioned space floor area, number of stories, or height of a building or structure.

AIR BARRIER. One or more materials joined together in a continuous manner to restrict or prevent the passage of air through the building thermal envelope and its assemblies.

AIR CURTAIN. A device, installed at the building entrance, that generates and discharges a laminar air stream intended to prevent the infiltration of external, unconditioned air into the conditioned spaces, or the loss of interior, conditioned air to the outside.

ALTERNATING CURRENT-OUTPUT UNINTERRUPTIBLE POWER SUPPLY (AC-OUTPUT UPS). A combination of convertors, switches and energy storage devices, such as batteries, constituting a power system for maintaining continuity of load power in case of input power failure. Input power failure occurs when voltage and frequency are outside rated steady state and transient tolerance bands or when distortion or interruptions are outside the limits specified for the uninterruptible power supply. An AC-output UPC is an uninterruptible power supply that supplies power with a continuous flow of electric charge that periodically reverses direction.

ALTERATION. Any construction, retrofit or renovation to an existing structure other than repair or addition. Also, a change in a building, electrical, gas, mechanical or plumbing system that involves an extension, addition or change to the arrangement, type or purpose of the original installation.

APPROVED. Acceptable to the code official.

APPROVED AGENCY. An established and recognized agency regularly engaged in conducting tests or furnishing inspection services, or furnishing product certification research reports, when such agency has been approved by the code official.

ATTIC AND OTHER ROOFS. Roofs other than roofs with insulation entirely above deck and metal building roofs, including roofs with insulation entirely below (inside of) the roof structure (i.e., attics, cathedral ceilings, and single-rafter ceilings), roofs with insulation both above and below the roof structure, and roofs without insulation.

AUTOMATIC. Self-acting, operating by its own mechanism when actuated by some impersonal influence, as, for example, a change in current strength, pressure, temperature or mechanical configuration (see "Manual").

AUTOMATIC CONTROL DEVICE. A device capable of automatically controlling equipment and devices without manual intervention.

History

• Statutory Authority: RCW 19.27A.020, 19.27A.025, 19.27A.160 and chapters 19.27A and 19.27 RCW. WSR 22-14-091, 23-12-101, and 23-20-021, § 51-11C-20201, filed 7/1/22, 6/7/23, and 9/25/23, effective 3/15/24. Statutory Authority: RCW 19.27A.020, 19.27A.025, 19.27A.160 and chapter 19.27 RCW. WSR 19-24-040, § 51-11C-20201, filed 11/26/19, effective 7/1/20. Statutory Authority: RCW 19.27A.025, 19.27A.160, and 19.27.074. WSR 16-03-072, § 51-11C-20201, filed 1/19/16, effective 7/1/16. Statutory Authority: RCW 19.27A.020, 19.27A.025 and chapters 19.27 and 34.05 RCW. WSR 13-04-056, § 51-11C-20201, filed 2/1/13, effective 7/1/13.

Wash. Admin. Code § 51-11C-20202 Section C202.2—B.

BELOW-GRADE WALL. That portion of a wall in the building envelope that is entirely below the finish grade and in contact with the ground.

BIOGAS. A mixture of hydrocarbons that is a gas at 60°F (15.5°C) and one atmosphere of pressure that is produced through the anaerobic digestion of organic matter.

BIOMASS. Nonfossilized and biodegradable organic material originating from plants, animals and/or micro-organisms, including products, byproducts, residues and waste from agriculture, forestry and related industries as well as the nonfossilized and biodegradable organic fractions of industrial and municipal wastes, including gases and liquids recovered from the decomposition of nonfossilized and biodegradable organic material.

BLOCK. A generic concept used in energy simulation. It can include one or more thermal zones. It represents a whole building or portion of a building with the same use type served by the same HVAC system type.

BOILER, MODULATING. A boiler that is capable of more than a single firing rate in response to a varying temperature or heating load.

BOILER SYSTEM. One or more boilers, their piping and controls that work together to supply steam or hot water to heat output devices remote from the boiler.

BUBBLE POINT. The refrigerant liquid saturation temperature at a specified pressure.

BUILDING. Any structure used or intended for supporting or sheltering any use or occupancy, including any mechanical systems, service water heating systems and electric power and lighting systems located on the building site and supporting the building.

BUILDING COMMISSIONING. A process that verifies and documents that the building systems have been installed and function according to the approved construction documents.

BUILDING ENTRANCE. Any doorway, set of doors, revolving door, vestibule or other form of portal (including elevator doors such as in parking garages) that is ordinarily used to gain access to the building or to exit from the building by its users and occupants. This does not include doors solely used to directly enter mechanical, electrical and other building utility service equipment rooms, or doors for emergency egress only. Where buildings have separate one-way doors to enter or leave, any doors ordinarily used to leave the building are also deemed a building entrance.

BUILDING SITE. A contiguous area of land that is under the ownership or control of one entity.

BUILDING THERMAL ENVELOPE. The below-grade walls, above-grade walls, floors, ceilings, roofs, and any other building element assemblies that meet one or more of the following criteria:

1. Separates conditioned areas of all types from unconditioned or unenclosed areas.

2. Separates conditioned areas of differing types including elements between fully conditioned areas, low energy, semi-heated, greenhouse, and refrigerated areas.

History

• Statutory Authority: RCW 19.27A.020, 19.27A.025, 19.27A.160 and chapters 19.27A and 19.27 RCW. WSR 22-14-091, 23-12-101, and 23-20-021, § 51-11C-20202, filed 7/1/22, 6/7/23, and 9/25/23, effective 3/15/24. Statutory Authority: RCW 19.27A.020, 19.27A.025, 19.27A.160 and chapter 19.27 RCW. WSR 19-24-040, § 51-11C-20202, filed 11/26/19, effective 7/1/20. Statutory Authority: RCW 19.27A.025, 19.27A.160, and 19.27.074. WSR 16-03-072, § 51-11C-20202, filed 1/19/16, effective 7/1/16. Statutory Authority: RCW 19.27A.020, 19.27A.025 and chapters 19.27 and 34.05 RCW. WSR 13-04-056, § 51-11C-20202, filed 2/1/13, effective 7/1/13.

Wash. Admin. Code § 51-11C-20203 Section C202.3—C.

C-FACTOR (THERMAL CONDUCTANCE). The coefficient of heat transmission (surface to surface) through a building component or assembly, equal to the time rate of heat flow per unit area and the unit temperature difference between the warm side and cold side surfaces (Btu/h ft2 × °F) [W/(m2 × K)].

CAPTIVE KEY DEVICE. A lighting control that will not release the key that activates the override when the lighting is on.

CAVITY INSULATION. Insulating material located between framing members.

CEILING FAN. A nonportable device suspended from a ceiling or overhead structure for circulating air via the rotation of the blades. See also LARGE-DIAMETER CEILING FAN.

CERTIFIED COMMISSIONING PROFESSIONAL. An individual who is certified by an ANSI/ISO/IEC 17024:2012 accredited organization to lead, plan, coordinate and manage commissioning teams and implement the commissioning process.

CHANGE OF OCCUPANCY. A change in the use of a building or a portion of a building that results in any of the following:

1. A change of occupancy classification.

2. A change from one group to another group within an occupancy classification.

3. Any change in use within a group for which there is a change in the application of the requirements of this code.

CIRCULATING HOT WATER SYSTEM. A specifically designed water distribution system where one or more pumps are operated in the service hot water piping to circulate heated water from the water-heating equipment to the fixture supply and back to the water-heating equipment.

CLERESTORY FENESTRATION. See "FENESTRATION."

CLIMATE ZONE. A geographical region based on climatic criteria as specified in this code.

CODE OFFICIAL. The officer or other designated authority charged with the administration and enforcement of this code, or a duly authorized representative.

COEFFICIENT OF PERFORMANCE (COP) - COOLING. The ratio of the rate of heat removal to the rate of energy input, in consistent units, for a complete refrigerating system or some specific portion of that system under designated operating conditions.

COEFFICIENT OF PERFORMANCE (COP) - HEATING. The ratio of the rate of heat removal to the rate of heat delivered to the rate of energy input, in consistent units, for a complete heat pump system, including the compressor and, if applicable, auxiliary heat, under designated operating conditions.

COMMERCIAL BUILDING. For this code, all buildings that are not included in the definition of "Residential buildings."

COMMUNITY RENEWABLE ENERGY SYSTEM. An off-site renewable energy system for which the owner has purchased or leased renewable energy capacity along with other subscribers.

COMPRESSED AIR SYSTEM. A system of at least one compressor providing compressed air at 40 psig or higher.

COMPUTER ROOM. A room whose primary function is to house equipment for the processing and storage of electronic data and that has a design total information technology equipment (ITE) equipment power density less than or equal to 20 watts per square foot (215 watts per m2) of conditioned floor area or a design ITE equipment load less than or equal to 10 kW. See also DATA CENTER.

CONDENSING UNIT. A factory-made assembly of refrigeration components designed to compress and liquefy a specific refrigerant. The unit consists of one or more refrigerant compressors, refrigerant condensers (air-cooled, evaporatively cooled, or water-cooled), condenser fans and motors (where used) and factory-supplied accessories.

CONDITIONED FLOOR AREA. The horizontal projection of the floors associated with the conditioned space.

CONDITIONED SPACE. An area, room or space that is enclosed within the building thermal envelope and that is directly heated or cooled or that is indirectly heated or cooled. Spaces are indirectly heated or cooled where they communicate through openings with conditioned spaces, where they are separated from conditioned spaces by uninsulated walls, floors or ceilings, or where they contain uninsulated ducts, piping or other sources of heating or cooling. Elevator shafts, stair enclosures, enclosed corridors connecting conditioned spaces, and enclosed spaces through which conditioned air is intentionally transferred at a rate exceeding three air changes per hour are considered conditioned spaces for the purposes of the building thermal envelope requirements.

CONTINUOUS INSULATION (CI). Insulating material that is continuous across all structural members without metal thermal bridges other than fasteners that have a total cross-sectional area not greater than 0.04 percent (0.12 percent where all metal thermal bridges are stainless steel) of the envelope surface through which they penetrate, and service openings. It is installed on the interior or exterior or is integral to any opaque surface of the building envelope.

CONTROLLED PLANT GROWTH ENVIRONMENT. Group F and U buildings or spaces that are used exclusively for and specifically controlled to facilitate and enhance plant growth and production by manipulating various indoor environmental conditions. Technologies include indoor agriculture, cannabis growing, hydroponics, aquaculture and aquaponics. Controlled indoor environment variables include, but are not limited to, temperature, air quality, humidity, and carbon dioxide.

CONTROLLED RECEPTACLE. An electrical receptacle that is controlled by an automatic control device.

CURTAIN WALL. Fenestration products used to create an external nonload-bearing wall that is designed to separate the exterior and interior environments.

Reviser's note: The brackets and enclosed material in the text of the above section occurred in the copy filed by the agency.

Wash. Admin. Code § 51-11C-20204 Section C202.4—D.

DATA ACQUISITION SYSTEM. An electronic system managed by the building owner to collect, tabulate and display metering information.

DATA CENTER. A room or series of rooms that share data center systems whose primary function is to house equipment for the processing and storage of electronic data, which has a design total information technology equipment (ITE) power density exceeding 20 watts per square foot (215 watts per m2) of conditioned area and a total design ITE equipment load greater than 10 kW.

DATA CENTER SYSTEMS. HVAC systems, electrical systems, equipment, or portions thereof used to condition ITE or electrical systems in a data center.

DAYLIGHT RESPONSIVE CONTROL. A device or system that provides automatic control of electric light levels based on the amount of daylight in a space.

DAYLIGHT ZONE. The portion of the building interior floor area that is illuminated by natural daylight through sidelit and toplit fenestration.

DECORATIVE APPLIANCE, VENTED. A vented appliance wherein the primary function lies in the aesthetic effect of the flames.

DEDICATED OUTDOOR AIR SYSTEM (DOAS). A ventilation system that supplies 100 percent outdoor air primarily for the purpose of ventilation without requiring operation of a space-conditioning system fan for outdoor air delivery.

DEMAND CONTROL KITCHEN VENTILATION (DCKV). A system that provides automatic, continuous control over exhaust hood, where required, and make-up air fan speed in response to one or more sensors that monitor cooking activity or through direct communication with cooking appliances.

DEMAND CONTROL VENTILATION (DCV). A ventilation system capability that provides for the automatic reduction of outdoor air intake below design rates when the actual occupancy of spaces served by the system is less than design occupancy.

DEMAND RECIRCULATION WATER SYSTEM. A water distribution system having one or more recirculation pumps that pump water from a heated water supply pipe back to the heated water source through a cold water supply pipe.

DEMAND RESPONSE SIGNAL. A signal that indicates a price or a request to modify electricity consumption for a limited time period.

DEMAND RESPONSIVE CONTROL. A control capable of receiving and automatically responding to a demand response signal.

DESICCANT DEHUMIDIFICATION SYSTEM. A mechanical dehumidification technology that uses a solid or liquid material to remove moisture from the air.

DIRECT DIGITAL CONTROL (DDC). A type of control where controlled and monitored analog or binary data such as temperature and contact closures are converted to digital format for manipulation and calculations by a digital computer or microprocessor, then converted back to analog or binary form to control physical devices.

DIRECTLY OWNED OFF-SITE RENEWABLE ENERGY SYSTEM. An off-site renewable energy system owned by the building project owner.

DISTRICT ENERGY EFFICIENCY FACTOR. Ratio of site energy input at the district plant required to produce a unit of heating or cooling at the project site on an annual basis, supported by calculations approved by the code official.

DOOR, GARAGE. Nonswinging doors rated by DASMA 105 with a single panel or horizontally hinged sectional panels.

DOOR, NONSWINGING. Roll-up, tilt-up, metal coiling and sliding doors, access hatches, and all other doors that are not swinging doors or garage doors with less than or equal to 14 percent glazing.

DOOR, SWINGING. Doors that are hinged on one side and revolving doors.

DUCT. A tube or conduit utilized for conveying air. The air passages of self-contained systems are not to be construed as air ducts.

DUCT SYSTEM. A continuous passageway for the transmission of air that, in addition to ducts, includes duct fittings, dampers, plenums, fans and accessory air-handling equipment and appliances.

DWELLING UNIT. A single unit providing complete independent living facilities for one or more persons, including permanent provisions for living, sleeping, eating, cooking and sanitation.

DX-DEDICATED OUTDOOR AIR SYSTEM UNITS (DX-DOAS UNITS). A type of air-cooled, water-cooled or water source factory assembled product that dehumidifies 100 percent outdoor air to a low dew point and includes reheat that is capable of controlling the supply dry-bulb temperature of the dehumidified air to the designated supply air temperature. This conditioned outdoor air is then delivered directly or indirectly to the conditioned spaces. It may precondition outdoor air by containing an enthalpy wheel, sensible wheel, desiccant wheel, plate heat exchanger, heat pipes, or other heat or mass transfer apparatus.

DYNAMIC GLAZING. Any fenestration product that has the fully reversible ability to change its performance properties, including U-factor, SHGC, or VT.

History

• Statutory Authority: RCW 19.27A.020, 19.27A.025, 19.27A.160, chapters 19.27A and 19.27 RCW. WSR 24-03-085, § 51-11C-20204, filed 1/16/24, effective 3/15/24
• WSR 22-14-091, 23-12-101, and 23-20-021, § 51-11C-20204, filed 7/1/22, 6/7/23, and 9/25/23, effective 3/15/24. Statutory Authority: RCW 19.27A.020, 19.27A.025, 19.27A.160 and chapter 19.27 RCW. WSR 19-24-040, § 51-11C-20204, filed 11/26/19, effective 7/1/20. Statutory Authority: RCW 19.27A.025, 19.27A.045, 19.27A.160, and 19.27.074. WSR 16-24-070, § 51-11C-20204, filed 12/6/16, effective 5/1/17. Statutory Authority: RCW 19.27A.025, 19.27A.160, and 19.27.074. WSR 16-03-072, § 51-11C-20204, filed 1/19/16, effective 7/1/16. Statutory Authority: RCW 19.27A.020, 19.27A.025 and chapters 19.27 and 34.05 RCW. WSR 13-04-056, § 51-11C-20204, filed 2/1/13, effective 7/1/13.

Wash. Admin. Code § 51-11C-20205 Section C202.5—E.

ECONOMIZER, AIR. A duct and damper arrangement and automatic control system that allows a cooling system to supply outside air to reduce or eliminate the need for mechanical cooling during mild or cold weather.

ECONOMIZER, WATER. A system where the supply air of a cooling system is cooled indirectly with water that is itself cooled by heat or mass transfer to the environment without the use of mechanical cooling.

ENCLOSED SPACE. A volume surrounded by solid surfaces such as walls, floors, roofs, and openable devices such as doors and operable windows. Unconditioned crawlspaces, attics, and parking garages with natural or mechanical ventilation are not considered enclosed spaces.

END USE CATEGORY. A load or group of loads that consume energy in a common or similar manner.

ENERGY ANALYSIS. A method for estimating the annual energy use of the proposed design and standard reference design based on estimates of energy use.

ENERGY COST. The total estimated annual cost for purchased energy for the building functions regulated by this code, including applicable demand charges.

ENERGY RECOVERY VENTILATION SYSTEM. Systems that employ air-to-air heat exchangers to recover energy from exhaust air for the purpose of preheating, precooling, humidifying or dehumidifying outdoor ventilation air prior to supplying the air to a space, either directly or as part of an HVAC system.

ENERGY SIMULATION TOOL. An approved software program or calculation-based methodology that projects the annual energy use of a building.

ENERGY SOURCE METER. A meter placed at the source of the incoming energy that measures the energy delivered to the whole building or metered space.

ENTHALPY RECOVERY RATIO (ERR). Change in the enthalpy of the outdoor air supply divided by the difference between the outdoor air and entering exhaust air enthalpy, expressed as a percentage.

ENTRANCE DOOR. A vertical fenestration product used for occupant ingress, egress and access in nonresidential buildings including, but not limited to, exterior entrances utilizing latching hardware and automatic closers and containing over 50 percent glazing specifically designed to withstand heavy duty usage.

EQUIPMENT ROOM. A space that contains either electrical equipment, mechanical equipment, machinery, water pumps or hydraulic pumps that are a function of the building's services.

EXTERIOR WALL. Walls including both above-grade walls and below-grade walls.

History

• Statutory Authority: RCW 19.27A.020, 19.27A.025, 19.27A.160 and chapters 19.27A and 19.27 RCW. WSR 22-14-091, 23-12-101, and 23-20-021, § 51-11C-20205, filed 7/1/22, 6/7/23, and 9/25/23, effective 3/15/24. Statutory Authority: RCW 19.27A.020, 19.27A.025, 19.27A.160 and chapter 19.27 RCW. WSR 19-24-040, § 51-11C-20205, filed 11/26/19, effective 7/1/20. Statutory Authority: RCW 19.27A.020, 19.27A.025 and chapters 19.27 and 34.05 RCW. WSR 13-04-056, § 51-11C-20205, filed 2/1/13, effective 7/1/13.

Wash. Admin. Code § 51-11C-20206 Section C202.6—F.

FAN, EMBEDDED. A fan that is part of a manufactured assembly where the assembly includes functions other than air movement.

FAN ARRAY. Multiple fans in parallel between two plenum sections in an air distribution system.

FAN BRAKE HORSEPOWER (BHP). The horsepower delivered to the fan's shaft. Brake horsepower does not include the mechanical drive losses (belts, gears, etc.).

FAN ELECTRICAL INPUT POWER (Fan kWdesign). The electrical input power in kilowatts required to operate an individual fan or fan array at design conditions. It includes the power consumption of motor controllers, if present.

FAN ENERGY INDEX (FEI). The ratio of the electric input power of a reference fan to the electric input power of the actual fan as calculated in accordance with AMCA 208.

FAN SYSTEM. Includes all the fans that contribute to the movement of air through a point of a common duct, plenum, or cabinet.

FAN SYSTEM, COMPLEX. A fan system that combines supply, exhaust and/or other fans, or is not captured by other fan system types.

FAN SYSTEM, EXHAUST/RELIEF. A fan system dedicated to the removal of air from interior spaces to the outdoors.

FAN SYSTEM, MULTI-ZONE VARIABLE AIR VOLUME (VAV). A fan system that serves three or more space-conditioning zones where airflow to each zone is individually controlled based on heating, cooling and/or ventilation requirements, indoor fan airflow varies as a function of load, and the sum of the minimum zone airflows is 40 percent or less of the fan system design conditions.

FAN SYSTEM, RETURN. A fan system dedicated to removing air from interior where some or all the air is to be recirculated except during economizer operation.

FAN SYSTEM, SINGLE-CABINET. A fan system where a single fan, single fan array, a single set of fans operating in parallel, or fans or fan arrays in series and embedded in the same cabinet, that both supplies air to a space and recirculates the air.

FAN SYSTEM, SUPPLY-ONLY. A fan system that provides supply air to interior spaces and does not recirculate the air.

FAN SYSTEM, TRANSFER. A fan system that exclusively moves air from one occupied space to another.

FAN SYSTEM AIRFLOW (cfm). The sum of the airflow of all fans with fan electrical input power greater than 1 kW at fan system design conditions, excluding the airflow that passes through downstream fans with fan input power less than 1 kW.

FAN SYSTEM BHP. The sum of the fan brake horsepower of all fans that are required to operate at fan system design conditions to supply air from the heating or cooling source to the conditioned space(s) and return it to the source or exhaust it to the outdoors.

FAN SYSTEM DESIGN CONDITIONS. Operating conditions that can be expected to occur during normal system operation that result in the highest supply fan airflow rate to conditioned spaces served by the system, other than during air economizer operation.

FAN SYSTEM ELECTRICAL INPUT POWER (Fan kWdesign, system). The sum of the fan electrical input power (Fan kWdesign) of all fans that are required to operate at fan system design conditions to supply air from the heating or cooling source to the conditioned spaces, return it to the source, exhaust it to the outdoors, or transfer it to another space.

FAN SYSTEM MOTOR NAMEPLATE HP. The sum of the motor nameplate horsepower of all fans that are required to operate at design conditions to supply air from the heating or cooling source to the conditioned space(s) and return it to the source or exhaust it to the outdoors.

FAULT DETECTION AND DIAGNOSTICS (FDD) SYSTEM. A software platform that utilizes building analytic algorithms to convert data provided by sensors and devices to automatically identify faults in building systems and provide a prioritized list of actionable resolutions to those faults based on cost or energy avoidance, comfort and maintenance impact.

FENESTRATION. Products classified as either skylights or vertical fenestration.

SKYLIGHTS. Glass or other transparent or translucent glazing material installed at a slope of less than 60 degrees (91.05 rad) from horizontal, including unit skylights, tubular daylighting devices and glazing materials in solariums, sunrooms, roofs, greenhouses, and sloped walls.

VERTICAL FENESTRATION. Windows that are fixed or operable, doors with more than 50 percent glazed area and glazed block composed of glass or other transparent or translucent glazing materials and installed at a slope not less than 60 degrees (91.05 rad) from horizontal. Opaque areas such as spandrel panels are not considered vertical fenestration.

CLERESTORY FENESTRATION. An upper region of vertical fenestration provided for the purpose of admitting daylight beyond the perimeter of a space. The entire clerestory fenestration assembly is installed at a height greater than 8 feet above the finished floor.

FENESTRATION AREA. Total area of the fenestration measured using the rough opening, and including the glazing, sash and frame.

FENESTRATION PRODUCT, FIELD-FABRICATED. A fenestration product whose frame is made at the construction site of standard dimensional lumber or other materials that were not previously cut, or otherwise formed with the specific intention of being used to fabricate a fenestration product or exterior door. Field fabricated does not include site-built fenestration.

FENESTRATION PRODUCT, SITE-BUILT. A fenestration designed to be made up of field-glazed or field-assembled units using specific factory cut or otherwise factory-formed framing and glazing units. Examples of site-built fenestration include storefront systems, curtain walls, and atrium roof systems.

F-FACTOR. The perimeter heat loss factor for slab-on-grade floors (Btu/h × ft × °F) [W/(m × K)].

FLOOR AREA, NET. The actual occupied area not including unoccupied accessory areas such as corridors, stairways, toilet rooms, mechanical rooms and closets.

FURNACE ELECTRICITY RATIO. The ratio of furnace electricity use to total furnace energy computed as ratio = (3.412 × EAE)/1000 × EF + 3.412 × EAE) where EAE (average annual auxiliary electrical consumption) and EF (average annual fuel energy consumption) are defined in Appendix N to Subpart B of Part 430 of Title 10 of the Code of Federal Regulations and EF is expressed in millions of Btus per year.

Reviser's note: The brackets and enclosed material in the text of the above section occurred in the copy filed by the agency.

Wash. Admin. Code § 51-11C-20207 Section C202.7—G.

GENERAL LIGHTING. Interior lighting that provides a substantially uniform level of illumination throughout a space. General lighting shall not include lighting that provides a dissimilar level of illumination to serve a specific application or decorative feature within such area.

GREENHOUSE. A structure or a thermally isolated area of a building that maintains a specialized sunlit environment exclusively used for, and is essential to, the cultivation, protection or maintenance of plants. Greenhouses are those that are erected for a period of 180 days or more.

GROUP R. Buildings or portions of buildings that contain any of the following occupancies as established in the International Building Code:

1. Group R-1.

2. Group R-2 where located more than three stories in height above grade plane.

History

• Statutory Authority: RCW 19.27A.020, 19.27A.025, 19.27A.160 and chapters 19.27A and 19.27 RCW. WSR 22-14-091, 23-12-101, and 23-20-021, § 51-11C-20207, filed 7/1/22, 6/7/23, and 9/25/23, effective 3/15/24. Statutory Authority: RCW 19.27A.020, 19.27A.025, 19.27A.160 and chapter 19.27 RCW. WSR 19-24-040, § 51-11C-20207, filed 11/26/19, effective 7/1/20. Statutory Authority: RCW 19.27A.025, 19.27A.160, and 19.27.074. WSR 16-03-072, § 51-11C-20207, filed 1/19/16, effective 7/1/16. Statutory Authority: RCW 19.27A.020, 19.27A.025 and chapters 19.27 and 34.05 RCW. WSR 13-04-056, § 51-11C-20207, filed 2/1/13, effective 7/1/13.

Wash. Admin. Code § 51-11C-20208 Section C202.8—H.

HEAT TRAP. An arrangement of piping and fittings, such as elbows, or a commercially available heat trap that prevents thermosyphoning of hot water during standby periods.

HEAT TRAP, PIPE CONFIGURED. A pipe configured heat trap is either, as applicable:

1. A device specifically designed for the purpose or an arrangement of tubing that forms a loop of 360 degrees; or

2. Piping that from the point of connection to the water heater (inlet or outlet) includes a length of piping directed downward before connection to the vertical piping of the supply water or hot-water distribution system.

HEATED SLAB-ON-GRADE FLOOR. Slab-on-grade floor construction in which the heating elements, hydronic tubing, or hot air distribution system is in contact with, or placed within or under, the slab.

HEATED WATER CIRCULATION SYSTEM. A water distribution system having one or more recirculation pumps that pump water from a heated water source through a dedicated hot water circulation pipe or piping system.

HIGH SPEED DOOR. A nonswinging door used primarily to facilitate vehicular access or material transportation, with a minimum opening rate of 32 inches (813 mm) per second, a minimum closing rate of 24 inches (610 mm) per second and that includes an automatic-closing device.

HISTORIC BUILDINGS. Any building or structure that is one or more of the following:

1. Listed, or certified as eligible for listing, by the State Historic Preservation Officer or the Keeper of the National Register of Historic Places, in the National Register of Historic Places.

2. Designated as historic under an applicable state or local law.

3. Certified as a contributing resource within a National Register-listed, state-designated or locally designated historic district.

HUMIDISTAT. A regulatory device, actuated by changes in humidity, used for automatic control of relative humidity.

HVAC TOTAL SYSTEM PERFORMANCE RATIO (HVAC TSPR). The ratio of the sum of a building's annual heating and cooling load in thousands of Btus to the sum of annual carbon emissions in pounds from energy consumption of the building HVAC systems. Carbon emissions shall be calculated by multiplying site energy consumption by the carbon emission factors from Table C407.1.

History

• Statutory Authority: RCW 19.27A.020, 19.27A.025, 19.27A.160 and chapters 19.27A and 19.27 RCW. WSR 22-14-091, 23-12-101, and 23-20-021, § 51-11C-20208, filed 7/1/22, 6/7/23, and 9/25/23, effective 3/15/24. Statutory Authority: RCW 19.27A.020, 19.27A.025, 19.27A.160 and chapter 19.27 RCW. WSR 19-24-040, § 51-11C-20208, filed 11/26/19, effective 7/1/20. Statutory Authority: RCW 19.27A.025, 19.27A.160, and 19.27.074. WSR 16-03-072, § 51-11C-20208, filed 1/19/16, effective 7/1/16. Statutory Authority: RCW 19.27A.020, 19.27A.025 and chapters 19.27 and 34.05 RCW. WSR 13-04-056, § 51-11C-20208, filed 2/1/13, effective 7/1/13.

Wash. Admin. Code § 51-11C-20209 Section C202.9—I.

IEC DESIGN H MOTOR. An electric motor that meets all of the following:

1. It is an induction motor designed for use with three-phase power.

2. It contains a cage rotor.

3. It is capable of direct-on-line starting.

4. It has 4, 6 or 8 poles.

5. It is rated from 0.4 kW to 1600 kW at a frequency of 60 Hz.

IEC DESIGN N MOTOR. An electric motor that meets all of the following:

1. It is an inductor motor designed for use with three-phase power.

2. It contains a cage rotor.

3. It is capable of direct-on-line starting.

4. It has 2, 4, 6 or 8 poles.

5. It is rated from 0.4 kW to 1600 kW at a frequency of 60 Hz.

INFILTRATION. The uncontrolled inward air leakage into a building caused by the pressure effects of wind or the effect of differences in the indoor and outdoor air density or both.

INFORMATION TECHNOLOGY EQUIPMENT (ITE). Items including computers, data storage, servers, network, and communication equipment.

INSULATION ENTIRELY ABOVE DECK. A roof with all insulation:

1. Installed above (outside of) the roof structure; and

2. Continuous (i.e., uninterrupted by framing members).

INTEGRATED ENERGY EFFICIENCY RATIO (IEER). A single-number figure of merit expressing cooling part-load EER efficiency for unitary air-conditioning and heat pump equipment on the basis of weighted operation at various load capacities for the equipment.

INTEGRATED HVAC SYSTEM. An HVAC system designed to handle both sensible and latent heat removal. Integrated HVAC systems may include, but are not limited to, HVAC systems with a sensible heat ratio of 0.65 or less and the capability of providing cooling, dedicated outdoor air systems, single package air conditioners with at least one refrigerant circuit providing hot gas reheat, and stand-alone dehumidifiers modified to allow external heat rejection.

INTEGRATED PART LOAD VALUE (IPLV). A single number figure of merit based on part-load EER, COP, or kW/ton expressing part-load efficiency for air conditioning and heat pump equipment on the basis of weighted operation at various load capacities for equipment.

INTEGRATED SEASONAL COEFFICIENT OF PERFORMANCE (ISCOP). A seasonal efficiency number that is a combined value based on the formula listed in AHRI Standard 920 of the two COP values for the heating season of a DX-DOAS unit water or air source heat pump, expressed in W/W.

INTEGRATED SEASONAL MOISTURE REMOVAL EFFICIENCY (ISMRE). A seasonal efficiency number that is a combined value based on the formula listed in AHRI Standard 920 of the four dehumidification moisture removal efficiency (MRE) ratings required for DX-DOAS units, expressed in lb. of moisture/kWh.

INTERNAL CURTAIN SYSTEM. A system consisting of moveable panels of fabric or plastic film used to cover and uncover the space enclosed in a greenhouse on a daily basis.

ISOLATION DEVICES. Devices that isolate HVAC zones so they can be operated independently of one another. Isolation devices include separate systems, isolation dampers and controls providing shutoff at terminal boxes.

History

• Statutory Authority: RCW 19.27A.020, 19.27A.025, 19.27A.160 and chapters 19.27A and 19.27 RCW. WSR 22-14-091, 23-12-101, and 23-20-021, § 51-11C-20209, filed 7/1/22, 6/7/23, and 9/25/23, effective 3/15/24. Statutory Authority: RCW 19.27A.020, 19.27A.025, 19.27A.160 and chapter 19.27 RCW. WSR 19-24-040, § 51-11C-20209, filed 11/26/19, effective 7/1/20. Statutory Authority: RCW 19.27A.025, 19.27A.160, and 19.27.074. WSR 16-03-072, § 51-11C-20209, filed 1/19/16, effective 7/1/16. Statutory Authority: RCW 19.27A.020, 19.27A.025 and chapters 19.27 and 34.05 RCW. WSR 13-04-056, § 51-11C-20209, filed 2/1/13, effective 7/1/13.

Wash. Admin. Code § 51-11C-20210 Section C202.10—J.

History

• Statutory Authority: RCW 19.27A.020, 19.27A.025 and chapters 19.27 and 34.05 RCW. WSR 13-04-056, § 51-11C-20210, filed 2/1/13, effective 7/1/13.

Wash. Admin. Code § 51-11C-20211 Section C202.11—K.

History

• Statutory Authority: RCW 19.27A.020, 19.27A.025 and chapters 19.27 and 34.05 RCW. WSR 13-04-056, § 51-11C-20211, filed 2/1/13, effective 7/1/13.

Wash. Admin. Code § 51-11C-20212 Section C202.12—L.

LABELED. Equipment, materials or products to which have been affixed a label, seal, symbol or other identifying mark of a nationally recognized testing laboratory, approvedagency or other organization concerned with product evaluation that maintains periodic inspection of the production of the above-labeled items and whose labeling indicates either that the equipment, material or product meets identified standards or has been tested and found suitable for a specified purpose.

LARGE-DIAMETER CEILING FAN. A ceiling fan that is greater than seven feet (2134 mm) in diameter. These fans are sometimes referred to as High-Volume, Low-Speed (HVLS) fans.

LARGEST NET CAPACITY INCREMENT. The largest increase in capacity when switching between combinations of base compressors that is expected to occur under the compressed air system control scheme.

LINER SYSTEM (LS). A system that includes the following:

1. A continuous vapor barrier liner membrane that is installed below the purlins and that is uninterrupted by framing members.

2. An uncompressed, unfaced insulation resting on top of the liner membrane and located between the purlins.

For multilayer installations, the last rated R-value of insulation is for unfaced insulation draped over purlins and then compressed when the metal roof panels are attached.

LISTED. Equipment, materials, products or services included in a list published by an organization acceptable to the code official and concerned with evaluation of products or services that maintains periodic inspection of production of listed equipment or materials or periodic evaluation of services and whose listing states either that the equipment, material, product or service meets identified standards or has been tested and found suitable for a specified purpose.

LOW-CARBON DISTRICT ENERGY EXCHANGE SYSTEM. Any system serving multiple buildings providing energy in the form of a circulated fluid that can accept or reject heat from individual buildings. Energy can be indirectly converted to meet building heating or cooling loads by serving as the heat source or sink for heat-pump systems. Examples include, but are not limited to, low temperature condenser water, ground source condenser water, or sewer heat recovery.

Low-carbon district energy exchange systems must demonstrate that 25 percent of the annual district-system-net-load-met (sum of heating and cooling energy provided to attached buildings) comes from heat recovery between connected buildings, waste heat, or renewable energy resources and no more than 25 percent of the annual heat input to the system comes from fossil fuel or electric-resistance sources.

LOW-CARBON DISTRICT HEATING AND COOLING OR HEATING ONLY SYSTEM. Any system serving multiple buildings providing energy in the form of direct heating and cooling, or heating only to a building. Energy can be directly converted to meet building heating or cooling loads through a heat exchanger. Examples include, but are not limited to, steam, hot water, and chilled water.

Low-carbon district systems must demonstrate the following:

1. Distribution losses must be accounted for and may not exceed 10 percent of the annual load delivered to buildings served by the system.

2. Twenty-five percent of the annual district-system-net-load-met (sum of heating and cooling energy provided to attached buildings) comes from heat recovery between connected buildings, waste heat or renewable energy resources and no more than 25 percent of the annual heat input to the system comes from fossil fuel or electric resistance sources; or

3. No more than 10 percent of the system annual heat input to the system comes from fossil fuel or electric resistance sources.

LOW-SLOPED ROOF. A roof having a slope less than 2 units vertical in 12 units horizontal.

LOW-VOLTAGE DRY-TYPE DISTRIBUTION TRANSFORMER. A transformer that is air-cooled, does not use oil as a coolant, has an input voltage less than or equal to 600 volts and is rated for operation at a frequency of 60 hertz.

LOW-VOLTAGE LIGHTING. A lighting system consisting of an isolating power supply, the low voltage luminaires, and associated equipment that are all identified for the use.

LUMINAIRE. A complete lighting unit consisting of a lamp or lamps together with the housing designed to distribute the light, position and protect the lamps, and connect the lamps to the power supply.

LUMINAIRE-LEVEL LIGHTING CONTROL. A lighting system consisting of one or more luminaires where each luminaire has embedded lighting control logic, occupancy and ambient light sensors, and local override switching capability, where required. Each luminaire shall also have local or central wireless networking capabilities to detect and share information with other luminaires to adjust to occupancy and/or daylight in the space.

History

• Statutory Authority: RCW 19.27A.020, 19.27A.025, 19.27A.160 and chapters 19.27A and 19.27 RCW. WSR 22-14-091, 23-12-101, and 23-20-021, § 51-11C-20212, filed 7/1/22, 6/7/23, and 9/25/23, effective 3/15/24. Statutory Authority: RCW 19.27A.020, 19.27A.025, 19.27A.160 and chapter 19.27 RCW. WSR 19-24-040, § 51-11C-20212, filed 11/26/19, effective 7/1/20. Statutory Authority: RCW 19.27A.025, 19.27A.045, 19.27A.160, and 19.27.074. WSR 17-10-062, § 51-11C-20212, filed 5/2/17, effective 6/2/17
• WSR 16-24-070, § 51-11C-20212, filed 12/6/16, effective 5/1/17. Statutory Authority: RCW 19.27A.025, 19.27A.160, and 19.27.074. WSR 16-03-072, § 51-11C-20212, filed 1/19/16, effective 7/1/16. Statutory Authority: RCW 19.27A.020, 19.27A.025 and chapters 19.27 and 34.05 RCW. WSR 13-04-056, § 51-11C-20212, filed 2/1/13, effective 7/1/13.

Wash. Admin. Code § 51-11C-20213 Section C202.13—M.

MANUAL. Capable of being operated by personal intervention (see "Automatic").

MASS TRANSFER DECK SLAB. A concrete slab designed to transfer structural load from the building perimeter wall or column line above, laterally to an offset wall or column line below, and which has conditioned or semiheated space on the inside of the upper wall and exterior or unconditioned space on the outside of the upper wall. The area of the slab edge shall be defined as the thickness of the slab multiplied by the length of the edge condition. Examples of this condition include, but are not limited to, the transition from an above-grade structure to a below-grade structure or the transition from a tower to a podium. A cantilevered concrete balcony does not constitute a mass transfer deck slab.

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MECHANICAL COOLING. Reducing the temperature of a gas or liquid by using vapor compression, absorption, desiccant dehumidification combined with evaporative cooling, or another energy-driven thermodynamic cycle. Indirect or direct evaporative cooling alone is not considered mechanical cooling.

MECHANICAL HEATING. Raising the temperature of a gas or liquid by use of fossil fuel burners, electric resistance heaters, heat pumps, or other systems that require energy to operate.

MECHANICAL LOAD COEFFICIENT (MLC). In a data center, the ratio of the cooling system's net use of energy to that of the ITE. The annual MLC is calculated using hourly weather data for the data center's location and equals the sum of all energy flowing into the cooling system to respond to that weather, minus any energy successfully recovered to avoid any new energy use, all divided by the energy flowing into the ITE during the same period.

MECHANICAL ROOM. A room or space in which mechanical equipment and appliances are located that has sufficient room for access and maintenance of the equipment or appliances with room energy doors closed.

METAL BUILDING ROOF. A roof that:

1. Is constructed with a metal, structural, weathering surface;

2. Has no ventilated cavity; and

3. Has the insulation entirely below deck (i.e., does not include composite concrete and metal deck construction nor a roof framing system that is separated from the superstructure by a wood substrate) and whose structure consists of one or more of the following configurations:

a. Metal roofing in direct contact with the steel framing members;

b. Metal roofing separated from the steel framing members by insulation;

c. Insulated metal roofing panels installed as described in a or b.

METAL BUILDING WALL. A wall whose structure consists of metal spanning members supported by steel structural members (i.e., does not include spandrel glass or metal panels in curtain wall systems).

METER. A device that measures the flow of energy.

MICROCELL. A wireless communication facility consisting of an antenna that is either: (a) Four (4) feet in height and with an area of not more than 580 square inches; or (b) if a tubular antenna, no more than four (4) inches in diameter and no more than six (6) feet in length; and the associated equipment cabinet that is six (6) feet or less in height and no more than 48 square feet in floor area.

MULTI-PASS HEAT PUMP WATER HEATER. A heat pump water heater control strategy requiring multiple passes of water through the heat pump to reach the final target storage water temperature.

History

• Statutory Authority: RCW 19.27A.020, 19.27A.025, 19.27A.160 and chapters 19.27A and 19.27 RCW. WSR 22-14-091, 23-12-101, and 23-20-021, § 51-11C-20213, filed 7/1/22, 6/7/23, and 9/25/23, effective 3/15/24. Statutory Authority: RCW 19.27A.020, 19.27A.025, 19.27A.160 and chapter 19.27 RCW. WSR 19-24-040, § 51-11C-20213, filed 11/26/19, effective 7/1/20. Statutory Authority: RCW 19.27A.025, 19.27A.160, and 19.27.074. WSR 16-03-072, § 51-11C-20213, filed 1/19/16, effective 7/1/16. Statutory Authority: RCW 19.27A.020, 19.27A.025 and chapters 19.27 and 34.05 RCW. WSR 13-04-056, § 51-11C-20213, filed 2/1/13, effective 7/1/13.

Wash. Admin. Code § 51-11C-20214 Section C202.14—N.

NAMEPLATE HORSEPOWER. The nominal motor output power rating stamped on the motor nameplate.

NEMA DESIGN A MOTOR. A squirrel-cage motor that meets all of the following:

1. It is designed to withstand full-voltage starting and developing locked-rotor torque as shown in paragraph 12.38.1 of NEMA MG 1.

2. It has pull-up torque not less than the values shown in paragraph 12.40.1 of NEMA MG 1.

3. It has breakdown torque not less than the values shown in paragraph 12.39.1 of NEMA MG 1.

4. It has a locked-rotor current higher than the values shown in paragraph 12.35.1 of NEMA MG 1 for 60 Hz and paragraph 12.35.2 of NEMA MG 1 for 50 Hz.

5. It has a slip at rated load of less than 5 percent for motors with fewer than 10 poles.

NEMA DESIGN B MOTOR. A squirrel-cage motor that meets all of the following:

1. It is designed to withstand full-voltage starting.

2. It develops locked-rotor, breakdown and pull-up torques adequate for general application as specified in Sections 12.38, 12.39 and 12.40 of NEMA MG 1.

3. It draws locked-rotor current not to exceed the values shown in paragraph 12.35.1 of NEMA MG 1 for 60 Hz and paragraph 12.35.2 of NEMA MG 1 for 50 Hz.

4. It has a slip at rated load of less than 5 percent for motors with fewer than 10 poles.

NEMA DESIGN C MOTOR. A squirrel-cage motor that meets all of the following:

1. It is designed to withstand full-voltage starting and developing locked-rotor torque for high-torque applications up to the values shown in paragraph 12.38.2 of NEMA MG 1 (incorporated by reference; see Sec. 431.15).

2. It has pull-up torque not less than the values shown in paragraph 12.40.2 of NEMA MG 1.

3. It has breakdown torque not less than the values shown in paragraph 12.39.2 of NEMA MG 1.

4. It has a locked-rotor current not to exceed the values shown in paragraph 12.35.1 of NEMA MG 1 for 60 Hz and paragraph 12.35.2 of NEMA MG 1 for 50 Hz.

5. It has a slip at rated load of less than 5 percent.

NETWORKED GUEST ROOM CONTROL SYSTEM. A control system, with access from the front desk or other central location associated with a Group R-1 building, that is capable of identifying the rented and unrented status of each guest room according to a timed schedule, and is capable of controlling HVAC in each hotel and motel guest room separately.

NONSTANDARD PART LOAD VALUE (NPLV). A single-number part-load efficiency figure of merit calculated and referenced to conditions other than IPLV conditions, for units that are not designed to operate at ARI standard rating conditions.

History

• Statutory Authority: RCW 19.27A.020, 19.27A.025, 19.27A.160 and chapters 19.27A and 19.27 RCW. WSR 22-14-091, 23-12-101, and 23-20-021, § 51-11C-20214, filed 7/1/22, 6/7/23, and 9/25/23, effective 3/15/24. Statutory Authority: RCW 19.27A.020, 19.27A.025, 19.27A.160 and chapter 19.27 RCW. WSR 19-24-040, § 51-11C-20214, filed 11/26/19, effective 7/1/20. Statutory Authority: RCW 19.27A.020, 19.27A.025 and chapters 19.27 and 34.05 RCW. WSR 13-04-056, § 51-11C-20214, filed 2/1/13, effective 7/1/13.

Wash. Admin. Code § 51-11C-20215 Section C202.15—O.

OCCUPANT SENSOR CONTROL. An automatic control device or system that detects the presence or absence of people within an area and causes lighting, equipment or appliances to be regulated accordingly.

ON-SITE RENEWABLE ENERGY. Energy from renewable energy resources harvested at the building site.

OPAQUE DOOR. A door that is not less than 50 percent opaque in surface area.

History

• Statutory Authority: RCW 19.27A.020, 19.27A.025, 19.27A.160 and chapters 19.27A and 19.27 RCW. WSR 22-14-091, 23-12-101, and 23-20-021, § 51-11C-20215, filed 7/1/22, 6/7/23, and 9/25/23, effective 3/15/24. Statutory Authority: RCW 19.27A.020, 19.27A.025, 19.27A.160 and chapter 19.27 RCW. WSR 19-24-040, § 51-11C-20215, filed 11/26/19, effective 7/1/20. Statutory Authority: RCW 19.27A.025, 19.27A.160, and 19.27.074. WSR 16-03-072, § 51-11C-20215, filed 1/19/16, effective 7/1/16. Statutory Authority: RCW 19.27A.020, 19.27A.025 and chapters 19.27 and 34.05 RCW. WSR 13-04-056, § 51-11C-20215, filed 2/1/13, effective 7/1/13.

Wash. Admin. Code § 51-11C-20216 Section C202.16—P.

PERSONAL WIRELESS SERVICE FACILITY. A wireless communication facility (WCF), including a microcell, which is a facility for the transmission and/or reception of radio frequency signals and which may include antennas, equipment shelter or cabinet, transmission cables, a support structure to achieve the necessary elevation, and reception and/or transmission devices or antennas.

PHOTOSYNTHETIC PHOTON EFFICACY (PPE). Photosynthetic photon flux divided by input electric power in units of micromoles per second per watt, or micromoles per joule as defined by ANSI/ASABE S640.

POWERED ROOF/WALL VENTILATORS. A fan consisting of a centrifugal or axial impeller with an integral driver in a weather-resistant housing and with a base designed to fit, usually by means of a curb, over a wall or roof opening.

POWER-OVER-ETHERNET LIGHTING (POE). Lighting sources powered by DC current utilizing Ethernet cables.

PRIMARY STORAGE. Compressed air storage located upstream of the distribution system and any pressure flow regulators.

PROCESS APPLICATION. A manufacturing, industrial, or commercial procedure or activity where the primary purpose is other than conditioning spaces and maintaining comfort and amenities for the occupants of a building.

PROPOSED DESIGN. A description of the proposed building used to estimate annual energy use and carbon emissions from energy consumption for determining compliance based on total building performance and HVAC total performance ratio.

PUBLIC LAVATORY FAUCET. A lavatory faucet that is not intended for private use as defined by the Uniform Plumbing Code and that is supplied with both potable cold and hot water.

History

• Statutory Authority: RCW 19.27A.020, 19.27A.025, 19.27A.160 and chapters 19.27A and 19.27 RCW. WSR 22-14-091, 23-12-101, and 23-20-021, § 51-11C-20216, filed 7/1/22, 6/7/23, and 9/25/23, effective 3/15/24. Statutory Authority: RCW 19.27A.020, 19.27A.025, 19.27A.160 and chapter 19.27 RCW. WSR 19-24-040, § 51-11C-20216, filed 11/26/19, effective 7/1/20. Statutory Authority: RCW 19.27A.025, 19.27A.160, and 19.27.074. WSR 16-03-072, § 51-11C-20216, filed 1/19/16, effective 7/1/16. Statutory Authority: RCW 19.27A.020, 19.27A.025 and chapters 19.27 and 34.05 RCW. WSR 13-04-056, § 51-11C-20216, filed 2/1/13, effective 7/1/13.

Wash. Admin. Code § 51-11C-20217 Section C202.17—Q.

History

• Statutory Authority: RCW 19.27A.020, 19.27A.025 and chapters 19.27 and 34.05 RCW. WSR 13-04-056, § 51-11C-20217, filed 2/1/13, effective 7/1/13.

Wash. Admin. Code § 51-11C-20218 Section C202.18—R.

RADIANT HEATING SYSTEM. A heating system that transfers heat to objects and surfaces within a conditioned space, primarily by infrared radiation.

READY ACCESS (TO). That which enables a device, appliance or equipment to be directly reached, without requiring the removal or movement of any panel or similar obstruction.

REFRIGERANT DEW POINT. The refrigerant vapor saturation temperature at a specified pressure.

REFRIGERATED WAREHOUSE COOLER. An enclosed storage space that has a total chilled storage area of 3,000 ft2 or greater and is designed to maintain a temperature of greater than 32°F but less than 55°F.

REFRIGERATED WAREHOUSE FREEZER. An enclosed storage space that has a total chilled storage area of 3,000 ft2 or greater and is designed to maintain a temperature at or below 32°F.

REFRIGERATION SYSTEM, LOW TEMPERATURE. Systems for maintaining food product in a frozen state in refrigeration applications.

REFRIGERATION SYSTEM, MEDIUM TEMPERATURE. Systems for maintaining food product above freezing in refrigeration applications.

REGISTERED DESIGN PROFESSIONAL. An individual who is registered or licensed to practice their respective design profession as defined by the statutory requirements of the professional registration laws of the state or jurisdiction in which the project is to be constructed.

RENEWABLE ENERGY RESOURCES. Energy derived from solar radiation, wind, waves, tides, biogas, biomass or extracted from hot fluid or steam heated within the earth.

RENEWABLE POWER PURCHASE AGREEMENT. A power purchase agreement for off-site renewable energy where the owner agrees to purchase renewable energy output and the associated renewable energy certificates at a fixed price schedule.

REPAIR. The reconstruction or renewal of any part of an existing building.

REPLACEMENT AIR. Outdoor air that is used to replace air removed from a building through an exhaust system. Replacement air may be derived from one or more of the following: Make-up air, supply air, transfer air and infiltration. However, the ultimate source of all replacement air is outdoor air. When replacement air exceeds exhaust, the result is exfiltration.

REROOFING. The process of recovering or replacing an existing roof covering. See "Roof Recover" and "Roof Replacement."

RESIDENTIAL BUILDING. For this code, the following building types are residential buildings:

1. Detached one- and two-family dwellings.

2. Multiple single-family dwellings (townhouses).

3. Group R-2 and R-3 buildings three stories or less in height above grade plane whose dwelling units are accessed directly from the exterior.

4. Accessory structures to residential buildings.

Group R-2 buildings with dwelling units accessed from interior corridors or other interior spaces are not residential buildings.

ROOF ASSEMBLY. A system designed to provide weather protection and resistance to design loads. The system consists of a roof covering and roof deck or a single component serving as both the roof covering and the roof deck. A roof assembly includes the roof covering, underlayment, roof deck, insulation, vapor retarder and interior finish. See also attic and other roofs, metal building roof, roof with insulation entirely above deck and single-rafter roof.

ROOF RECOVER. The process of installing an additional roof covering over a prepared existing roof covering without removing the existing roof covering.

ROOF REPAIR. Reconstruction or renewal of any part of an existing roof for the purposes of its maintenance.

ROOF REPLACEMENT. The process of removing the existing roof covering, repairing any damaged substrate and installing a new roof covering.

ROOFTOP MONITOR. A raised section of a roof containing vertical fenestration along one or more sides.

R-VALUE (THERMAL RESISTANCE). The inverse of the time rate of heat flow through a body from one of its bounding surfaces to the other surface for a unit temperature difference between the two surfaces, under steady state conditions, per unit area (h • ft2 • °F/Btu) [(m2 • K)/W].

Reviser's note: The brackets and enclosed material in the text of the above section occurred in the copy filed by the agency.

Wash. Admin. Code § 51-11C-20219 Section C202.19—S.

SATURATED-CONDENSING TEMPERATURE. The saturation temperature corresponding to the measured refrigerant pressure at the condenser inlet for single component and azeotropic refrigerants, and the arithmetic average of the dew point and bubble point temperatures corresponding to the refrigerant pressure at the condenser entrance for zeotropic refrigerants.

SEMI-HEATED SPACE. An enclosed space within a building, including adjacent connected spaces separated by an uninsulated component (e.g., basements, utility rooms, garages, corridors), which:

1. Is heated but not cooled, and has an installed heating system output capacity greater than or equal to 3.4 Btu/(h-ft2) but not greater than 8 Btu/(h-ft2);

2. Is not a walk-incooler, walk-in freezer, refrigerated warehouse cooler or refrigerated warehouse freezer space.

SENSIBLE RECOVERY EFFECTIVENESS. Change in the dry-bulb temperature of the outdoor air supply divided by the difference between the outdoor air and return air dry-bulb temperatures, expressed as a percentage, governed by AHRI Standard 1060.

SERVICE WATER HEATING. Heating water for domestic or commercial purposes other than space heating and process requirements.

SIDELIT. See Section C405.2.5.2.

SINGLE-PASS HEAT PUMP WATER HEATER. A heat pump water heater control strategy using variable flow or variable capacity to deliver water from the heat pump at the final target storage water temperature in a single-pass through the heat exchanger with variable incoming water temperatures.

SINGLE-RAFTER ROOF. A roof where the roof above and the ceiling below are both attached to the same wood rafter and where insulation is located in the space between these wood rafters.

SKYLIGHT. See "Fenestration."

SLAB BELOW GRADE. Any portion of a slab floor in contact with the ground which is more than 24 inches below the final elevation of the nearest exterior grade.

SLAB-ON-GRADE FLOOR. That portion of a slab floor of the building envelope that is in contact with the ground and that is either above grade or is less than or equal to 24 inches below the final elevation of the nearest exterior grade.

SLEEPING UNIT. A room or space in which people sleep, which can also include permanent provisions for living, eating, and either sanitation or kitchen facilities but not both. Such rooms and spaces that are also part of a dwelling unit are not sleeping units.

SMALL ELECTRIC MOTOR. A general purpose, alternating current, single speed induction motor.

SMALL BUSINESS. Any business entity (including a sole proprietorship, corporation, partnership or other legal entity) which is owned and operated independently from all other businesses, which has the purpose of making a profit, and which has fifty or fewer employees.

SOLAR HEAT GAIN COEFFICIENT (SHGC). The ratio of the solar heat gain entering the space through the fenestration assembly to the incident solar radiation. Solar heat gain includes directly transmitted solar heat and absorbed solar radiation which is then reradiated, conducted or convected into the space.

SOLAR ZONE. A clear area or areas reserved solely for current and future installation of photovoltaic or solar hot water systems.

SPACE CONDITIONING CATEGORY. Categories are based on the allowed peak space conditioning output capacity per square foot of conditioned floor area, or the design set point temperature, for a building or space. Space conditioning categories include: Low energy, semi-heated, conditioned, refrigerated walk-in and warehouse coolers, and refrigerated walk-in and warehouse freezers.

STAND-ALONE DEHUMIDIFIER. A product with the sole purpose of dehumidifying the space that does not include a portable air conditioner, room air conditioner, or packaged terminal air conditioner. Stand-alone dehumidifier is a self-contained, electrically operated, and mechanically encased assembly consisting of:

1. A refrigerated surface (evaporator) that condenses moisture from the atmosphere;

2. A refrigerating system, including an electric motor;

3. An air-circulating fan; and

4. A means for collecting or disposing of the condensate.

STANDARD REFERENCE DESIGN. A version of the proposed design that meets the minimum requirements of this code and is used to determine the maximum annual energy use requirement and carbon emissions from energy consumption for compliance based on total building performance and HVAC total system performance ratio.

STEEL-FRAMED WALL. A wall with a cavity (insulated or otherwise) whose exterior surfaces are separated by steel framing members (i.e., typical steel stud walls and curtain wall systems).

STOREFRONT. A system of doors and windows mulled as a composite fenestration structure that has been designed to resist heavy use. Storefront systems include, but are not limited to, exterior fenestration systems that span from the floor level or above to the ceiling of the same story on commercial buildings, with or without mulled windows and doors.

SUBSYSTEM METER. A meter placed downstream of the energy supply meter that measures the energy delivered to a load or a group of loads.

SYSTEM. A combination of equipment and auxiliary devices (e.g., controls, accessories, interconnecting means and terminal elements) by which energy is transformed so it performs a specific function, such as HVAC, service water heating or lighting.

History

• Statutory Authority: RCW 19.27A.020, 19.27A.025, 19.27A.160 and chapters 19.27A and 19.27 RCW. WSR 22-14-091, 23-12-101, and 23-20-021, § 51-11C-20219, filed 7/1/22, 6/7/23, and 9/25/23, effective 3/15/24. Statutory Authority: RCW 19.27A.020, 19.27A.025, 19.27A.160 and chapter 19.27 RCW. WSR 19-24-040, § 51-11C-20219, filed 11/26/19, effective 7/1/20. Statutory Authority: RCW 19.27A.025, 19.27A.160, and 19.27.074. WSR 16-03-072, § 51-11C-20219, filed 1/19/16, effective 7/1/16. Statutory Authority: RCW 19.27A.020, 19.27A.025 and chapters 19.27 and 34.05 RCW. WSR 13-04-056, § 51-11C-20219, filed 2/1/13, effective 7/1/13.

Wash. Admin. Code § 51-11C-20220 Section C202.20—T.

TEMPERATURE MAINTENANCE. The system used to maintain the temperature of the building service hot water delivery system, typically by circulation and reheating or by a heat trace system.

TEMPORARY GROWING STRUCTURE. A temporary growing structure has sides and roof covered with polyethylene, polyvinyl or similar flexible synthetic material and is used to provide plants with either frost protection or increased heat retention. Temporary structures are those that are erected for a period of less than 180 days.

TESTING UNIT ENCLOSURE AREA. The area sum of all the boundary surfaces that define the dwelling unit, sleeping unit, or occupiable conditioned space including top/ceiling, bottom/floor and all side walls. This does not include interior partition walls within the dwelling unit, sleeping unit, or occupiable conditioned space. Wall height shall be measured from the finished floor of the conditioned space to the finished floor or roof/ceiling air barrier above.

THERMAL DISTRIBUTION EFFICIENCY (TDE). The resistance to changes in air heat as air is conveyed through a distance of air duct. TDE is a heat loss calculation evaluating the difference in the heat of the air between the air duct inlet and outlet caused by differences in temperatures between the air in the duct and the duct material. TDE is expressed as a percent difference between the inlet and outlet heat in the duct.

THERMOSTAT. An automatic control device used to maintain temperature at a fixed or adjustable set point.

TIME SWITCH CONTROL. An automatic control device or system that controls lighting or other loads, including switching off, based on time schedules.

TOPLIT. See Section C405.2.5.3.

TUBULAR DAYLIGHTING DEVICE (TDD). A nonoperable skylight device primarily designed to transmit daylight from a roof surface to an interior ceiling surface via a tubular conduit. The device consists of an exterior glazed weathering surface, a light transmitting tube with a reflective inside surface and an interior sealing device, such as a translucent ceiling panel.

History

• Statutory Authority: RCW 19.27A.020, 19.27A.025, 19.27A.160 and chapters 19.27A and 19.27 RCW. WSR 22-14-091, 23-12-101, and 23-20-021, § 51-11C-20220, filed 7/1/22, 6/7/23, and 9/25/23, effective 3/15/24. Statutory Authority: RCW 19.27A.020, 19.27A.025, 19.27A.160 and chapter 19.27 RCW. WSR 19-24-040, § 51-11C-20220, filed 11/26/19, effective 7/1/20. Statutory Authority: RCW 19.27A.025, 19.27A.160, and 19.27.074. WSR 16-03-072, § 51-11C-20220, filed 1/19/16, effective 7/1/16. Statutory Authority: RCW 19.27A.020, 19.27A.025 and chapters 19.27 and 34.05 RCW. WSR 13-04-056, § 51-11C-20220, filed 2/1/13, effective 7/1/13.

Wash. Admin. Code § 51-11C-20221 Section C202.21—U.

U-FACTOR (THERMAL TRANSMITTANCE). The coefficient of heat transmission (air to air) through a building component or assembly, equal to the time rate of heat flow per unit area and unit temperature difference between the warm side and cold side air films (Btu/h • ft2 • °F) [W/(m2 • K)].

UNCONDITIONED SPACE. An enclosed space within a building that is not a conditioned space and that is not categorized under Section C402.1.1. Crawlspaces, attics and parking garages with natural or mechanical ventilation are not considered enclosed spaces.

UNHEATED SLAB-ON-GRADE FLOOR. A slab-on-grade floor that is not a heated slab-on-grade floor.

UNIFORM ILLUMINATION. A quality of illumination delivered by a lighting system typically comprised of similar fixtures mounted at a regular spacing interval. This lighting system provides a uniform contrast ratio of no greater than 5:1 maximum-to-minimum ratio throughout the entire area served, including task areas.

Reviser's note: The brackets and enclosed material in the text of the above section occurred in the copy filed by the agency.

Wash. Admin. Code § 51-11C-20222 Section C202.22—V.

VARIABLE REFRIGERANT FLOW SYSTEM. An engineered direct-expansion (DX) refrigerant system that incorporates a common condensing unit, at least one variable capacity compressor, a distributed refrigerant piping network to multiple indoor fan heating and cooling units each capable of individual zone temperature control, through integral zone temperature control devices and a common communications network. Variable refrigerant flow utilizes three or more steps of control on common interconnecting piping.

VENTILATION. The natural or mechanical process of supplying conditioned or unconditioned air to, or removing such air from, any space.

VENTILATION AIR. That portion of supply air that comes from outside (outdoors) plus any recirculated air that has been treated to maintain the desired quality of air within a designated space.

VERTICAL FENESTRATION. See "FENESTRATION."

VISIBLE TRANSMITTANCE [VT]. The ratio of visible light entering the space through the fenestration product assembly to the incident visible light, visible transmittance, includes the effects of glazing material and frame and is expressed as a number between 0 and 1. For skylights, VT shall be measured and rated in accordance with NFRC 202.

VISIBLE TRANSMITTANCE - ANNUAL [VT-ANNUAL]. The ratio of visible light entering the space through the fenestration product assembly to the incident visible light during the course of a year, which includes the effects of glazing material, frame, and light well or tubular conduit, and is expressed as a number between 0 and 1. For tubular daylighting devices, VT-annual shall be measured and rated in accordance with NFRC 203.

VOLTAGE DROP. A decrease in voltage caused by losses in the wiring system that connect the power source to the load.

Reviser's note: The brackets and enclosed material in the text of the above section occurred in the copy filed by the agency.

Wash. Admin. Code § 51-11C-20223 Section C202.23—W.

WALK-IN COOLER. An enclosed storage space capable of being refrigerated to temperatures above 32°F (0°C) and less than 55°F (12.8°C) that can be walked into, has a ceiling height of not less than 7 feet (2134 mm) and has a total chilled storage area of less than 3,000 square feet (279 m2).

WALK-IN FREEZER. An enclosed storage space capable of being refrigerated to temperatures at or below 32°F (0°C) that can be walked into, has a ceiling height of not less than 7 feet (2134 mm) and has a total chilled storage area of less than 3,000 square feet (279 m2).

WALL. That portion of the building envelope, including opaque area and fenestration, that is vertical or tilted at an angle of 60 degrees from horizontal or greater. This includes above-grade walls and below-grade walls, between-floor spandrels, peripheral edges of floors, foundation walls, roof and basement knee walls, dormer walls, gable end walls, walls enclosing a mansard roof, and skylight shafts.

WATER HEATER. Any heating appliance or equipment that heats potable water and supplies such water to the potable hot water distribution system.

WOOD-FRAMED AND OTHER WALLS. All other wall types, including wood stud walls.

History

• Statutory Authority: RCW 19.27A.020, 19.27A.025, 19.27A.160 and chapters 19.27A and 19.27 RCW. WSR 22-14-091, 23-12-101, and 23-20-021, § 51-11C-20223, filed 7/1/22, 6/7/23, and 9/25/23, effective 3/15/24. Statutory Authority: RCW 19.27A.025, 19.27A.160, and 19.27.074. WSR 16-03-072, § 51-11C-20223, filed 1/19/16, effective 7/1/16. Statutory Authority: RCW 19.27A.020, 19.27A.025 and chapters 19.27 and 34.05 RCW. WSR 13-04-056, § 51-11C-20223, filed 2/1/13, effective 7/1/13.

Wash. Admin. Code § 51-11C-20224 Section C202.24—X, Y, Z.

ZONE. A space or group of spaces within a building with heating or cooling requirements that are sufficiently similar so that desired conditions can be maintained throughout using a single controlling device.

History

• Statutory Authority: RCW 19.27A.020, 19.27A.025 and chapters 19.27 and 34.05 RCW. WSR 13-04-056, § 51-11C-20224, filed 2/1/13, effective 7/1/13.

Wash. Admin. Code § 51-11C-30000 Chapter 3 CE—General requirements.

Reviser's note: The brackets and enclosed material in the text of the above section occurred in the copy filed by the agency.

Wash. Admin. Code § 51-11C-30100 Section C301—Climate zones.

C301.1 General. Climate zones from Table C301.1 shall be used in determining the applicable requirements from Chapter 4.

Table C301.1

Climate Zones and Moisture Regimes

Designations by State and County

| Key: A - Moist, B - Dry, C - Marine. Absence of moisture designation indicates moisture regime is irrelevant. | | | | --- | --- | --- | | WASHINGTON | | | | 5B Adams | 4C Grays Harbor | 4C Pierce | | 5B Asotin | 4C Island | 4C San Juan | | 5B Benton | 4C Jefferson | 4C Skagit | | 5B Chelan | 4C King | 5B Skamania | | 4C Clallam | 4C Kitsap | 4C Snohomish | | 4C Clark | 5B Kittitas | 5B Spokane | | 5B Columbia | 5B Klickitat | 5B Stevens | | 4C Cowlitz | 4C Lewis | 4C Thurston | | 5B Douglas | 5B Lincoln | 4C Wahkiakum | | 5B Ferry | 4C Mason | 5B Walla Walla | | 5B Franklin | 5B Okanogan | 4C Whatcom | | 5B Garfield | 4C Pacific | 5B Whitman | | 5B Grant | 5B Pend Oreille | 5B Yakima |

History

• Statutory Authority: RCW 19.27A.025, 19.27A.045, and 19.27.074. WSR 13-23-096, § 51-11C-30100, filed 11/20/13, effective 4/1/14. Statutory Authority: RCW 19.27A.020, 19.27A.025 and chapters 19.27 and 34.05 RCW. WSR 13-04-056, § 51-11C-30100, filed 2/1/13, effective 7/1/13.

Wash. Admin. Code § 51-11C-30200 Section C302—Design conditions.

C302.1 Interior design conditions. The interior design temperatures used for heating and cooling load calculations shall be a maximum of 72°F (22°C) for heating and minimum of 75°F (24°C) for cooling.

C302.2 Exterior design conditions. The heating or cooling outdoor design temperatures shall be selected from Appendix C.

History

• Statutory Authority: RCW 19.27A.020, 19.27A.025 and chapters 19.27 and 34.05 RCW. WSR 13-04-056, § 51-11C-30200, filed 2/1/13, effective 7/1/13.

Wash. Admin. Code § 51-11C-30300 Section C303—Materials, systems and equipment.

History

• Statutory Authority: RCW 19.27A.020, 19.27A.025 and chapters 19.27 and 34.05 RCW. WSR 13-04-056, § 51-11C-30300, filed 2/1/13, effective 7/1/13.

Wash. Admin. Code § 51-11C-30310 Section 303.1—Identification.

C303.1 Identification. Materials, systems and equipment shall be identified in a manner that will allow a determination of compliance with the applicable provisions of this code.

C303.1.1 Building thermal envelope insulation. An R-value identification mark shall be applied by the manufacturer to each piece of building thermal envelope insulation 12 inches (305 mm) or greater in width. Alternately, the insulation installers shall provide a certification listing the type, manufacturer and R-value of insulation installed in each element of the building thermal envelope. For blown or sprayed insulation (fiberglass and cellulose), the initial installed thickness, settled thickness, settled R-value, installed density, coverage area and number of bags installed shall be listed on the certification. For sprayed polyurethane foam (SPF) insulation, the installed thickness of the areas covered and R-value of installed thickness shall be listed on the certification. For insulated siding, the R-value shall be labeled on the product's package and shall be listed on the certification. The insulation installer shall sign, date and post the certification in a conspicuous location on the job site.

| EXCEPTION: | For roof insulation installed above the deck, the R-value shall be labeled as required by the material standards specified in Table 1508.2 of the International Building Code. | | --- | --- |

C303.1.1.1 Blown or sprayed roof/ceiling insulation. The thickness of blown-in or sprayed fiberglass and cellulose roof/ceiling insulation shall be written in inches (mm) on markers for every 300 square feet (28 m2) of attic area throughout the attic space. The markers shall be affixed to the trusses or joists and marked with the minimum initial installed thickness with numbers of not less than 1 inch (25 mm) in height. Each marker shall face the attic access opening. Spray polyurethane foam thickness and installed R-value shall be listed on certification provided by the insulation installer.

C303.1.2 Insulation mark installation. Insulating materials shall be installed such that the manufacturer's R-value mark is readily observable upon inspection. For insulation materials that are installed without an observable manufacturer's R-value mark, such as blown or draped products, an insulation certificate complying with Section C303.1.1 shall be left immediately after installation by the installer, in a conspicuous location within the building, to certify the installed R-value of the insulation material.

C303.1.3 Fenestration product rating.U-factors of fenestration shall be determined as follows:

1. For windows, doors and skylights, U-factor ratings shall be determined in accordance with NFRC 100.

2. Where required for garage doors and rolling doors, U-factor ratings shall be determined in accordance with either NFRC 100 or ANSI/DASMA 105.

U-factors shall be determined by an accredited, independent laboratory, and labeled and certified by the manufacturer.

Products lacking such a labeled U-factor shall be assigned a default U-factor from Table C303.1.3(1), C303.1.3(2) or C303.1.3(4). The solar heat gain coefficient (SHGC) and visible transmittance (VT) of glazed fenestration products (windows, glazed doors and skylights) shall be determined in accordance with NFRC 200 by an accredited, independent laboratory, and labeled and certified by the manufacturer. Products lacking such a labeled SHGC or VT shall be assigned a default SHGC or VT from Table C303.1.3(3). For tubular daylighting devices, VTannual shall be measured and rated in accordance with NFRC 203.

| EXCEPTION: | Units without NFRC ratings produced by a small business may be assigned default U-factors from Table C303.1.3(5) for vertical fenestration. | | --- | --- |

C303.1.4 Insulation product rating. The thermal resistance (R-value) of insulation shall be determined in accordance with the U.S. Federal Trade Commission R-value rule (C.F.R. Title 16, Part 460) in units of h × ft2 × °F/Btu at a mean temperature of 75°F (24°C).

C303.1.4.1 Insulated siding. The thermal resistance (R-Value) shall be determined in accordance with ASTM C1363. Installation for testing shall be in accordance with the manufacturer's installation instructions.

C303.1.5 Spandrel panels in glass curtain walls. Table C303.1.5 provides default U-factors for the spandrel section of glass and other curtain wall systems. Design factors that affect performance are the type of framing, the type of spandrel panel and the R-value of insulation. Four framing conditions are considered in the table. The first is the common case where standard aluminum mullions are used. Standard mullions provide a thermal bridge through the insulation, reducing its effectiveness. The second case is for metal framing members that have a thermal break. A thermal break frame uses a urethane or other nonmetallic element to separate the metal exposed to outside conditions from the metal that is exposed to interior conditions. The third case is for structural glazing or systems where there are no exposed mullions on the exterior. The fourth case is for the condition where there is no framing or the insulation is continuous and uninterrupted by framing. The columns in the table can be used for any specified level of insulation between framing members installed in framed curtain walls or spandrel panels.

C303.1.5.1 Window wall application. Where "window wall" or similar assembly that is discontinuous at intermediate slab edges is used, the slab edge U-value shall be as listed in Appendix Table A103.3.7.1(3) or as determined using an approved calculation.

C303.1.5.2 Table value assumptions. In addition to the spandrel panel assembly, the construction assembly U-factors assume an air gap between the spandrel panel (with an R-value of 1.39) and one layer of 5/8-inch gypsum board (with an R-value of 0.56) that provides the interior finish. The gypsum board is assumed to span between the window sill and a channel at the floor. For assemblies that differ from these assumptions, custom U-factors can be calculated to account for any amount of continuous insulation or for unusual construction assemblies using Equations 3-1, 3-2 or 3-3 where appropriate. Spandrel panel U-factors for assemblies other than those covered by Table C303.1.5 or Equations 3-1 through 3-3 may be determined using an alternate approved methodology. Equations 3-1 through 3-3 do not calculate the value of any insulation inboard of the curtain wall assembly.

Aluminum without Thermal Break

(Equation 3-1)

| | | --- |

Aluminum with Thermal Break

(Equation 3-2)

| | | --- |

Structural Glazing

(Equation 3-3)

| | | --- |

Reviser's note: The brackets and enclosed material in the text of the above section occurred in the copy filed by the agency.

Wash. Admin. Code § 51-11C-303131 Table C303.1.3(1)—Default glazed window, glass door and skylight U-factors.

Table C303.1.3(1)

Default Glazed Window, Glass Door and Skylight U-Factors

| | Window and Glass Door | | | | --- | --- | --- | --- | | FRAME TYPE | SINGLE PANE | DOUBLE PANE | SKY-LIGHT | | Metal | 1.20 | 0.80 | | | Metal with Thermal Break | 1.10 | 0.65 | See Table C303.1.3(4) | | Nonmetal or Metal Clad | 0.95 | 0.55 | | | Glazed Block | 0.60 | | |

History

• Statutory Authority: RCW 19.27A.020, 19.27A.025, 19.27A.160 and chapter 19.27 RCW. WSR 19-24-040, § 51-11C-303131, filed 11/26/19, effective 7/1/20. Statutory Authority: RCW 19.27A.025, 19.27A.160, and 19.27.074. WSR 16-03-072, § 51-11C-303131, filed 1/19/16, effective 7/1/16. Statutory Authority: RCW 19.27A.020, 19.27A.025 and chapters 19.27 and 34.05 RCW. WSR 13-04-056, § 51-11C-303131, filed 2/1/13, effective 7/1/13.

Wash. Admin. Code § 51-11C-303132 Table C303.1.3(2)—Default door U-factors.

Table C303.1.3(2)

Default Opaque Door U-Factors

See Appendix A, Section A107

History

• Statutory Authority: RCW 19.27A.020, 19.27A.025, 19.27A.160 and chapter 19.27 RCW. WSR 19-24-040, § 51-11C-303132, filed 11/26/19, effective 7/1/20. Statutory Authority: RCW 19.27A.020, 19.27A.025 and chapters 19.27 and 34.05 RCW. WSR 13-04-056, § 51-11C-303132, filed 2/1/13, effective 7/1/13.

Wash. Admin. Code § 51-11C-303133 Table C303.1.3(3)—Default glazed fenestration SHGC and VT.

Table C303.1.3(3)

Default Glazed Fenestration SHGC and VT

| | SINGLE GLAZED | DOUBLE GLAZED | GLAZE BLOCK | | | | --- | --- | --- | --- | --- | --- | | | Clear | Tinted | Clear | Tinted | | | SHGC | 0.40 | 0.40 | 0.40 | 0.40 | 0.40 | | VT | 0.6 | 0.3 | 0.6 | 0.3 | 0.6 |

History

• Statutory Authority: RCW 19.27A.020, 19.27A.025 and chapters 19.27 and 34.05 RCW. WSR 13-04-056, § 51-11C-303133, filed 2/1/13, effective 7/1/13.

Wash. Admin. Code § 51-11C-303134 Table C303.1.3(4)—Default U-factors for skylights.

Table C303.1.3(4)

Default U-Factors for Skylights

| | Frame Type | | | | | | --- | --- | --- | --- | --- | --- | | | Aluminum Without Thermal Break | Aluminum With Thermal Break | Reinforced Vinyl/Aluminum- Clad Wood or Vinyl | Wood or Vinyl-Clad Wood/Vinyl Without Reinforcing | | | Fenestration Type | | | | | | | Single Glazing | | | | | | | | glass | U-1.58 | U-1.51 | U-1.40 | U-1.18 | | | acrylic/polycarb | U-1.52 | U-1.45 | U-1.34 | U-1.11 | | Double Glazing | | | | | | | | air | U-1.05 | U-0.89 | U-0.84 | U-0.67 | | | argon | U-1.02 | U-0.86 | U-0.80 | U-0.64 | | Double Glazing, e = 0.20 | | | | | | | | air | U-0.96 | U-0.80 | U-0.75 | U-0.59 | | | argon | U-0.91 | U-0.75 | U-0.70 | U-0.54 | | Double Glazing, e = 0.10 | | | | | | | | air | U-0.94 | U-0.79 | U-0.74 | U-0.58 | | | argon | U-0.89 | U-0.73 | U-0.68 | U-0.52 | | Double Glazing, e = 0.05 | | | | | | | | air | U-0.93 | U-0.78 | U-0.73 | U-0.56 | | | argon | U-0.87 | U-0.71 | U-0.66 | U-0.50 | | Triple Glazing | | | | | | | | air | U-0.90 | U-0.70 | U-0.67 | U-0.51 | | | argon | U-0.87 | U-0.69 | U-0.64 | U-0.48 | | Triple Glazing, e = 0.20 | | | | | | | | air | U-0.86 | U-0.68 | U-0.63 | U-0.47 | | | argon | U-0.82 | U-0.63 | U-0.59 | U-0.43 | | Triple Glazing, e = 0.20 on 2 surfaces | | | | | | | | air | U-0.82 | U-0.64 | U-0.60 | U-0.44 | | | argon | U-0.79 | U-0.60 | U-0.56 | U-0.40 | | Triple Glazing, e = 0.10 on 2 surfaces | | | | | | | | air | U-0.81 | U-0.62 | U-0.58 | U-0.42 | | | argon | U-0.77 | U-0.58 | U-0.54 | U-0.38 | | Quadruple Glazing, e = 0.10 on 2 surfaces | | | | | | | | air | U-0.78 | U-0.59 | U-0.55 | U-0.39 | | | argon | U-0.74 | U-0.56 | U-0.52 | U-0.36 | | | krypton | U-0.70 | U-0.52 | U-0.48 | U-0.32 |

| 1 | U-factors are applicable to both glass and plastic, flat and domed units, all spacers and gaps. | | --- | --- | | 2 | Emissivities shall be less than or equal to the value specified. | | 3 | Gap fill shall be assumed to be air unless there is a minimum of 90 percent argon or krypton. | | 4 | Aluminum frame with thermal break is as defined in footnote 1 to Table C303.1.3(5). |

History

• Statutory Authority: RCW 19.27A.020, 19.27A.025 and chapters 19.27 and 34.05 RCW. WSR 13-04-056, § 51-11C-303134, filed 2/1/13, effective 7/1/13.

Wash. Admin. Code § 51-11C-303135 Table C303.1.3(5)—Small business compliance default table.

Table C303.1.3(5)

Small Business Compliance Table

Default U-Factors for Vertical Glazing

| Vertical Glazing Description | Frame Type | | | | | | | --- | --- | --- | --- | --- | --- | --- | | Any Frame | Aluminum Thermal Break2 | Wood/Vinyl/ Fiberglass | | | | | | Panes | Low-e1 | Spacer | Fill | | | | | Double3 | A | Any | Argon | 0.48 | 0.41 | 0.32 | | | B | Any | Argon | 0.46 | 0.39 | 0.30 | | | C | Any | Argon | 0.44 | 0.37 | 0.28 | | | C | High Performance | Argon | 0.42 | 0.35 | Deemed to comply5 | | Triple4 | A | Any | Air | 0.50 | 0.44 | 0.26 | | | B | Any | Air | 0.45 | 0.39 | 0.22 | | | C | Any | Air | 0.41 | 0.34 | 0.20 | | | Any double low-e | Any | Air | 0.35 | 0.32 | 0.18 |

| 1 | Low-eA (emissivity) shall be 0.24 to 0.16. | | --- | --- | | | Low-eB (emissivity) shall be 0.15 to 0.08. | | | Low-eC (emissivity) shall be 0.07 or less. | | 2 | Aluminum Thermal Break = An aluminum thermal break framed window shall incorporate the following minimum design characteristics: | | a) | The thermal conductivity of the thermal break material shall be not more than 3.6 Btu-in/h/ft2/°F; | | b) | The thermal break material must produce a gap in the frame material of not less than 0.210 inches; and | | c) | All metal framing members of the products exposed to interior and exterior air shall incorporate a thermal break meeting the criteria in a) and b) above. | | 3 | A minimum air space of 0.375 inches between panes of glass is required for double glazing. | | 4 | A minimum air space of 0.25 inches between panes of glass is required for triple glazing. | | 5 | Deemed to comply glazing shall not be used for performance compliance. |

History

• Statutory Authority: RCW 19.27A.020, 19.27A.025 and chapters 19.27 and 34.05 RCW. WSR 13-04-056, § 51-11C-303135, filed 2/1/13, effective 7/1/13.

Wash. Admin. Code § 51-11C-30315 Table C303.1.5—U-factors for spandrel panels and glass curtain walls.

Table C303.1.5

U-Factors for Spandrel Panels and Glass Curtain Walls

| | | Rated R-Value of Insulation Between Framing Members | | | | | | | | | | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | | None | R-4 | R-7 | R-10 | R-15 | R-20 | R-25 | R-30 | | | | | Frame Type | Spandrel Panel | | A | B | C | D | E | F | G | H | | Aluminum without Thermal Break | Single glass pane, stone or metal panel | 1 | 0.360 | 0.242 | 0.222 | 0.212 | 0.203 | 0.198 | 0.195 | 0.193 | | Double glass with no low-e coatings | 2 | 0.297 | 0.233 | 0.218 | 0.209 | 0.202 | 0.197 | 0.194 | 0.192 | | | Triple or low-e glass | 3 | 0.267 | 0.226 | 0.214 | 0.207 | 0.200 | 0.196 | 0.194 | 0.192 | | | Aluminum with Thermal Break | Single glass pane, stone or metal panel | 4 | 0.350 | 0.211 | 0.186 | 0.173 | 0.162 | 0.155 | 0.151 | 0.149 | | Double glass with no low-e coatings | 5 | 0.278 | 0.200 | 0.180 | 0.170 | 0.160 | 0.154 | 0.151 | 0.148 | | | Triple or low-e glass | 6 | 0.241 | 0.191 | 0.176 | 0.167 | 0.159 | 0.153 | 0.150 | 0.148 | | | Structural Glazing | Single glass pane, stone or metal panel | 7 | 0.354 | 0.195 | 0.163 | 0.147 | 0.132 | 0.123 | 0.118 | 0.114 | | Double glass with no low-e coatings | 8 | 0.274 | 0.180 | 0.156 | 0.142 | 0.129 | 0.122 | 0.117 | 0.114 | | | Triple or low-e glass | 9 | 0.231 | 0.169 | 0.150 | 0.138 | 0.127 | 0.121 | 0.116 | 0.113 | | | No Framing, or Insulation is Continuous | Single glass pane, stone or metal panel | 10 | 0.360 | 0.148 | 0.102 | 0.078 | 0.056 | 0.044 | 0.036 | 0.031 | | Double glass with no low-e coatings | 11 | 0.297 | 0.136 | 0.097 | 0.075 | 0.054 | 0.043 | 0.035 | 0.030 | | | Triple or low-e glass | 12 | 0.267 | 0.129 | 0.093 | 0.073 | 0.053 | 0.042 | 0.035 | 0.030 | |

History

• Statutory Authority: RCW 19.27A.020, 19.27A.025, 19.27A.160 and chapter 19.27 RCW. WSR 19-24-040, § 51-11C-30315, filed 11/26/19, effective 7/1/20.

Wash. Admin. Code § 51-11C-30320 Section C303.2—Installation.

C303.2 Installation. Materials, systems and equipment shall be installed in accordance with the manufacturer's instructions and the International Building Code.

C303.2.1 Protection of exposed foundation insulation. Insulation applied to the exterior of basement walls, crawlspace walls and the perimeter of slab-on-grade floors shall have a rigid, opaque and weather-resistant protective covering to prevent the degradation of the insulation's thermal performance. The protective covering shall cover the exposed exterior insulation and extend not less than 6 inches (153 mm) below grade.

C303.2.2 Multiple layers of continuous insulation. Where two or more layers of continuous insulation board are used in a construction assembly, the continuous insulation boards shall be installed in accordance with Section C303.2. Where the continuous insulation board manufacturer's instructions do not address installation of two or more layers, the edge joints between each layer of continuous insulation boards shall be staggered.

History

• Statutory Authority: RCW 19.27A.020, 19.27A.025, 19.27A.160 and chapter 19.27 RCW. WSR 19-24-040, § 51-11C-30320, filed 11/26/19, effective 7/1/20. Statutory Authority: RCW 19.27A.025, 19.27A.160, and 19.27.074. WSR 16-03-072, § 51-11C-30320, filed 1/19/16, effective 7/1/16. Statutory Authority: RCW 19.27A.020, 19.27A.025 and chapters 19.27 and 34.05 RCW. WSR 13-04-056, § 51-11C-30320, filed 2/1/13, effective 7/1/13.

Wash. Admin. Code § 51-11C-30330 Reserved.

History

• Statutory Authority: RCW 19.27A.020, 19.27A.025, 19.27A.160 and chapter 19.27 RCW. WSR 19-24-040, § 51-11C-30330, filed 11/26/19, effective 7/1/20. Statutory Authority: RCW 19.27A.020, 19.27A.025 and chapters 19.27 and 34.05 RCW. WSR 13-04-056, § 51-11C-30330, filed 2/1/13, effective 7/1/13.

Wash. Admin. Code § 51-11C-40000 Chapter 4 CE—Commercial energy efficiency.

Reviser's note: The brackets and enclosed material in the text of the above section occurred in the copy filed by the agency.

Wash. Admin. Code § 51-11C-40100 Section C401—General.

C401.1 Scope. The provisions in this chapter are applicable to commercial buildings and their building sites.

C401.2 Application. Commercial buildings shall comply with the fossil fuel compliance path according to Section C401.3, or with one of the following:

1. Prescriptive compliance. The prescriptive compliance option requires compliance with Sections C402 through C406, and Sections C408, C409, C410, C411, and C412.

2. Total building performance. The total building performance option requires compliance with Section C407.

3. When adopted by the local jurisdiction, the requirements of Appendix F, Outcome-Based Energy Budget, Sections C408, C409, C410, C411, C412 and any specific sections in Table C407.2 as determined by the local jurisdiction. The Proposed Total UA of the proposed building shall be no more than 20 percent higher than the Allowed Total UA as defined in Section C402.1.5.

C401.2.1 Application to existing buildings. Additions, alterations, repairs, and changes of space conditioning, occupancy, or use to existing buildings shall comply with Chapter 5.

C401.2.2 Application to process equipment. Energy using equipment used by a manufacturing, industrial, or commercial process other than for conditioning spaces or maintaining comfort and amenities for the occupants shall comply with Section C401.3.1 Item 2, C403.3.2, Tables C403.3.2(1) through (16) inclusive, Sections C403.3.4.1 through C403.3.4.3, C403.7.7, C403.9.2.1, C403.10.3, C403.11.2, C403.11.3, Table C404.2, and Sections C405.8, C410, and C412.

C401.3 Fossil fuel compliance path. Buildings complying with the fossil fuel compliance path shall comply with the prescriptive compliance path of this code as defined in Item 1 of Section C401.2, and as modified by this Section C401.3.

C401.3.1 Modification of code requirements. For use of this compliance path only, the following changes shall be made to this code:

1. Section C403.1.4 - Space heating. Strike the phrase "… or fossil fuel combustion …" from the first sentence of Section C403.1.4.

2. Section C404.2.1 - Service water heating. Revise the first sentence of Section C404.2.1 to read: "Service hot water shall be provided by fossil fuel water heating equipment, electric air-source heat pump water heating equipment, electric resistance water heating equipment, or a combination of these equipment types meeting the requirements of this section."

3. Section C406.2.5 - Renewable energy. When determining renewable energy credits in Equation 4-17 of Section C406.2.5, strike the phrase "… limited to 50 percent of the required credits in Section C406.1" in the definition of the factor AECRRa.

4. Table C406.2 - Efficiency measure credits. Use Table C406.2(2) credit values in place of Table C406.2(1) credit values.

C401.3.2 Fossil fuel equipment. Fossil fuel combustion appliances are permitted for HVAC heating, and shall comply with the applicable efficiency standards referenced in Section C403.3.3.2. Fossil fuel combustion appliances are permitted for service water heating, and shall comply with applicable efficiency standards referenced in Table C404.2.

C401.3.3 Additional efficiency credits. The number of additional efficiency credits required by Table C406.1 shall be increased by the number required in Table C401.3.3, modified as permitted in this section, and is in addition to the energy efficiency credits and load management credits required by Section C406.

| EXCEPTION: | The required number of space heating additional efficiency credits are permitted to be reduced in the following instances: | | --- | --- | | | 1. Low energy spaces in accordance with Section C402.1.1.1 and equipment buildings in accordance with Section C402.1.2 that are served by space heating systems shall comply with sufficient measures from Table C406.2(1) or Table C406.2(2) to achieve a minimum of 50 percent of the efficiency credits required for new construction by Table C401.3.3, modified as permitted in this section. | | | 2. Building additions that have less than 1,000 square feet of conditioned floor area and that comply with sufficient measures from Table C406.2(1) or Table C406.2(2) to achieve a minimum of 50 percent of the additional efficiency credits required for additions by Table C401.3.3, modified as permitted in this section. | | | 3. Semi-heated spaces in accordance with Section C402.1.1.2 that comply with sufficient measures from Table C406.2(1) or Table C406.2(2) to achieve a minimum of 50 percent of the space heating additional efficiency credits required by Table C401.3.3, modified as permitted in this section. | | | 4. Unconditioned spaces, open parking garages and unheated enclosed parking garages are not required to achieve the additional efficiency credits for space heating required by Table C401.3.3. |

TABLE C401.3.3

ADDITIONAL CREDITS REQUIRED

| Measure Title | Applicable Section | Occupancy Group | | | | | | | --- | --- | --- | --- | --- | --- | --- | --- | | Group R-1 | Group R-2 | Group B | Group E | Group M | All Other | | | | New building - Additional efficiency credits required for space heating systems using the fossil fuel pathway | C401.3.3.1 | 7 | 24 | 101 | 38 | 111 | 56 | | New building - Additional efficiency credits required for service water heating systems using the fossil fuel pathway | C401.3.3.2 | 198 | 212 | 27 | 17 | 79 | 107 | | Building additions - Additional efficiency credits required for space heating systems using the fossil fuel pathway | C401.3.3.1 | 4 | 12 | 51 | 19 | 56 | 28 | | Building additions - Additional efficiency credits required for service water heating systems using the fossil fuel pathway | C401.3.3.2 | 99 | 106 | 14 | 9 | 40 | 54 |

C401.3.3.1 HVAC credit modification. The number of HVAC heating energy efficiency credits required by Table C401.3.3 is permitted to be decreased according to the following equation:

CR = A × (C - B)/D

| Where: | | | | | --- | --- | --- | --- | | | CR | = | Additional credits required, rounded to the nearest whole number. | | | A | = | Baseline HVAC heating credits from Table C401.3.3. | | | B | = | Installed fossil fuel space heating capacity in kBTU/h of appliances that comply with any of the exceptions to Section C403.1.4. | | | C | = | Total installed fossil fuel space heating capacity in kBTU/h of all HVAC heating appliances. | | | D | = | Total capacity in kBTU/h of all types of space heating appliances. |

C401.3.3.2 Service water heating credit modification. The number of service water heating energy efficiency credits required by Table C401.3.3 is permitted to be decreased according to the following equation:

CR = A × (C - B)/D

| Where: | | | | | --- | --- | --- | --- | | | CR | = | Additional credits required, rounded to the nearest whole number. | | | A | = | Baseline credits from Table C401.3.3. | | | B | = | Installed service water heating appliances capacity in kBTU/h of service water heating appliances that comply with any of the exceptions to Section C404.2.1. | | | C | = | Total installed fossil fuel service water heating capacity in kBTU/h of all service water heating appliances. | | | D | = | Total capacity in kBTU/h of all types of service water heating appliances. |

C401.3.4 Renewable energy credit limit. No more than 80 percent of the efficiency credits required by Sections C401.3.3.1 and C401.3.3.2 are permitted to be renewable energy credits defined in Section C406.2.5.

C401.3.5 Discrete area-weighting of additional required credits. In addition to the area-weighted credit requirements in Section C406.1.2, where a building includes multiple occupancies, the additional required credits per Table C401.3.3 shall be determined separately for each occupancy group. Additional required credits shall be prorated on an area-weighted basis for each occupancy group in the same manner as required project credits per Section C406.1.

1. Where a single space heating or service water heating system serves multiple occupancies, the number of additional required credits shall be prorated on an area-weighted basis for each occupancy served.

2. Additional required credits for envelope systems shall be prorated on an area-weighted basis for all occupancies.

3. Occupancies are permitted to be subdivided into discrete areas, with required and achieved credits for each area prorated on an area-weighted basis as required for the occupancy group.

C401.3.6 Electrification readiness. Additionally, the following provisions shall be required for new construction for each fossil fuel space heating or service water heating appliance installed:

1. Provide a spare electrical branch circuit conduit to the location of a future replacement heat pump appliance to support an equivalent heating capacity.

2. Provide spare electrical service entrance conduits for the purpose of upgrading the main electrical service to support all heat pump appliances throughout the building.

3. The main electrical room has sufficient space to accommodate increasing the main electrical service's size to support all heat pump appliances throughout the building.

4. Additional accommodations for the equipment comprised of transformer(s) and other equipment necessary to support an electrical service upgrade. These accommodations shall include adequate space on the site. If the equipment is located in a transformer vault, that vault must include not only the space to support electrical service upgrade but also include accommodations for additional cooling for larger transformer(s).

C401.4 Thermal envelope certificate. A permanent thermal envelope certificate shall be completed by an approved party. Such certificate shall be posted on a wall in the space where the space conditioning equipment is located, a utility room or other approved location. If located on an electrical panel, the certificate shall not cover or obstruct the visibility of the circuit directory label, service disconnect label, or other required labels. A copy of the certificate shall also be included in the construction files for the project. The certificate shall include:

1. R-values of insulation installed in or on ceilings, roofs, walls, foundations and slabs, crawlspace walls and floors, and ducts outside conditioned spaces.

2. U-factors and solar heat gain coefficients (SHGC) of fenestration.

3. Results from any building envelope air leakage testing performed on the building.

Where there is more than one value for any component of the building envelope, the certificate shall indicate the area-weighted average value where available. If the area-weighted average is not available, the certificate shall list each value that applies to 10 percent or more of the total component area.

History

• Statutory Authority: RCW 19.27A.045 and chapter 19.27A RCW. WSR 24-16-147, § 51-11C-40100, filed 8/7/24, effective 9/7/24. Statutory Authority: RCW 19.27A.020, 19.27A.025, 19.27A.160, chapters 19.27A and 19.27 RCW. WSR 24-03-085, § 51-11C-40100, filed 1/16/24, effective 3/15/24
• WSR 22-14-091, 23-12-101, and 23-20-021, § 51-11C-40100, filed 7/1/22, 6/7/23, and 9/25/23, effective 3/15/24. Statutory Authority: RCW 19.27A.020, 19.27A.025, 19.27A.160 and chapter 19.27 RCW. WSR 19-24-040, § 51-11C-40100, filed 11/26/19, effective 7/1/20. Statutory Authority: RCW 19.27A.025, 19.27A.045, 19.27A.160, and 19.27.074. WSR 16-24-070, § 51-11C-40100, filed 12/6/16, effective 5/1/17
• WSR 16-13-089, § 51-11C-40100, filed 6/15/16, effective 7/16/16. Statutory Authority: RCW 19.27A.025, 19.27A.160, and 19.27.074. WSR 16-03-072, § 51-11C-40100, filed 1/19/16, effective 7/1/16. Statutory Authority: RCW 19.27A.020, 19.27A.025 and chapters 19.27 and 34.05 RCW. WSR 13-04-056, § 51-11C-40100, filed 2/1/13, effective 7/1/13.

Wash. Admin. Code § 51-11C-40200 Section C402—Building envelope requirements.

History

• Statutory Authority: RCW 19.27A.020, 19.27A.025 and chapters 19.27 and 34.05 RCW. WSR 13-04-056, § 51-11C-40200, filed 2/1/13, effective 7/1/13.

Wash. Admin. Code § 51-11C-40210 Section C402.1—General (Prescriptive).

C402.1 General. Building thermal envelope assemblies for buildings that are intended to comply with the code on a prescriptive basis, in accordance with the compliance path described in Item 1 of Section C401.2, shall comply with the following:

1. The opaque portions of the building thermal envelope shall comply with the specific insulation requirements of Section C402.2 and the thermal requirements of either the R-value based method of Section C402.1.3, the U-, C- and F-factor based method of Section C402.1.4, or the component performance alternative of Section C402.1.5.

2. Fenestration in building envelope assemblies shall comply with Section C402.4, or the component performance alternative of Section C402.1.5.

3. Air leakage of building envelope assemblies shall comply with Section C402.5.

History

• Statutory Authority: RCW 19.27A.020, 19.27A.025, 19.27A.160 and chapter 19.27 RCW. WSR 19-24-040, § 51-11C-40210, filed 11/26/19, effective 7/1/20. Statutory Authority: RCW 19.27A.025, 19.27A.045, 19.27A.160, and 19.27.074. WSR 16-24-070, § 51-11C-40210, filed 12/6/16, effective 5/1/17. Statutory Authority: RCW 19.27A.025, 19.27A.160, and 19.27.074. WSR 16-03-072, § 51-11C-40210, filed 1/19/16, effective 7/1/16. Statutory Authority: RCW 19.27A.020, 19.27A.025 and chapters 19.27 and 34.05 RCW. WSR 13-04-056, § 51-11C-40210, filed 2/1/13, effective 7/1/13.

Wash. Admin. Code § 51-11C-40211 Section C402.1.1—Low energy buildings.

C402.1.1Low energy buildings, semi-heated buildings and greenhouses. Low energy buildings shall comply with Section C402.1.1.1. Semi-heated buildings and spaces shall comply with Section C402.1.1.2. Greenhouses shall comply with Section C402.1.1.3.

C402.1.1.1 Low energy buildings. The following buildings, or enclosed portions thereof, separated from the remainder of the building by building thermal envelope assemblies complying with this code shall be exempt from all thermal envelope provisions of this code:

1. Those that are heated and/or cooled with a peak design rate of energy usage less than 3.4 Btu/h × ft2 (10.7 W/m2) or 1.0 watt/ft2 (10.7 W/m2) of floor area for space conditioning purposes.

2. Those that do not contain conditioned space.

3. Unstaffed equipment shelters or cabinets used solely for personal wireless service facilities.

C402.1.1.2 Semi-heated buildings and spaces. The building envelope of semi-heated buildings, or portions thereof, shall comply with the same requirements as that for conditioned spaces in Section C402, except as modified by this section. The total installed output capacity of mechanical space conditioning systems serving a semi-heated building or space shall comply with Section C202. Building envelope assemblies separating conditioned space from semi-heated space shall comply with exterior envelope insulation requirements. Semi-heated spaces are not required to comply with the opaque wall insulation provisions of Section C402.2.3 for walls that separate semi-heated spaces from the exterior or low energy spaces. Fenestration that forms part of the building thermal envelope enclosing semi-heated spaces shall comply with Section C402.4. Semi-heated spaces shall be calculated separately from other conditioned spaces for compliance purposes.

Opaque walls in semi-heated spaces shall be calculated as fully code compliant opaque walls for both the target and proposed for the Target UA calculations for Component Performance compliance per Section C402.1.5, and for the Baseline Building Design for Total Building Performance compliance per Section C407. The capacity of heat trace temperature maintenance systems complying with Section C404.7.2 that are provided for freeze protection of piping and equipment only shall not be included in the total installed output capacity of mechanical space conditioning systems.

| EXCEPTION: | Provided the total installed heating output capacity of mechanical space conditioning does not exceed the criteria for semi-heated space as defined in Section C202, a semi-heated building or space may comply with this section when served by heat pumps without electric resistance back up and connected to a heating only thermostat. | | --- | --- |

C402.1.1.3 Greenhouses.Greenhouse structures or areas that comply with all of the following shall be exempt from the building envelope requirements of this code:

1. Exterior opaque envelope assemblies complying with Sections C402.2 and C402.4.4.

| EXCEPTION: | Low energy greenhouses that comply with Section C402.1.1.1. | | --- | --- |

2. Interior partition building thermal envelope assemblies that separate the greenhouse from conditioned space complying with Sections C402.2, C402.4.3 and C402.4.4.

3. Fenestration assemblies complying with the thermal envelope requirements in Table C402.1.1.3. The U-factor for the skylight shall be for the roof assembly or a roof that includes the assembly and an internal curtain system.

| EXCEPTION: | Unheated greenhouses. | | --- | --- |

4. No mechanical cooling is provided.

5. For heated greenhouses, heating is provided by a radiant heating system, a condensing natural gas-fired or condensing propane-fired heating system, or a heat pump with cooling capacity permanently disabled as preapproved by the jurisdiction.

Table C402.1.1.3

Fenestration Thermal Envelope Maximum Requirements

| Component | U-Factor BTU/h-ft2-°F | | --- | --- | | Skylights | 0.5 | | Vertical fenestration | 0.6 |

History

• Statutory Authority: RCW 19.27A.045 and chapter 19.27A RCW. WSR 24-16-145, § 51-11C-40211, filed 8/7/24, effective 9/7/24. Statutory Authority: RCW 19.27A.020, 19.27A.025, 19.27A.160 and chapters 19.27A and 19.27 RCW. WSR 22-14-091, 23-12-101, and 23-20-021, § 51-11C-40211, filed 7/1/22, 6/7/23, and 9/25/23, effective 3/15/24. Statutory Authority: RCW 19.27A.025, 19.27A.045 and chapter 19.27 RCW. WSR 20-21-080, § 51-11C-40211, filed 10/19/20, effective 2/1/21. Statutory Authority: RCW 19.27A.020, 19.27A.025, 19.27A.160 and chapter 19.27 RCW. WSR 19-24-040, § 51-11C-40211, filed 11/26/19, effective 7/1/20. Statutory Authority: RCW 19.27A.025, 19.27A.045, 19.27A.160, and 19.27.074. WSR 16-24-070, § 51-11C-40211, filed 12/6/16, effective 5/1/17. Statutory Authority: RCW 19.27A.025, 19.27A.160, and 19.27.074. WSR 16-03-072, § 51-11C-40211, filed 1/19/16, effective 7/1/16. Statutory Authority: RCW 19.27A.020, 19.27A.025 and chapters 19.27 and 34.05 RCW. WSR 13-04-056, § 51-11C-40211, filed 2/1/13, effective 7/1/13.

Wash. Admin. Code § 51-11C-40212 Section C402.1.2—Equipment buildings.

C402.1.2 Equipment buildings. Buildings that comply with all of the following shall be exempt from the building thermal envelope provisions of this code:

1. Are separate buildings with floor area no more than 500 square feet (50 m2).

2. Are intended to house electric equipment with installed equipment power totaling at least 7 watts per square foot (75 W/m2) and not intended for human occupancy.

3. Are served by mechanical cooling and heating systems sized in accordance with Sections C403.1.2 and C403.3.1.

4. Have a heating system capacity not greater than 17,000 Btu/hr (5 kW) and a heating thermostat set point that is restricted to not more than 50°F (10°C).

5. Have an average wall and roof U-factor less than 0.200.

| EXCEPTION: | Where the cooling and heating system is a heat pump, the heating capacity is allowed to exceed 17,000 Btu/h provided the heat pump cooling efficiency is at least 15 percent better than the requirements in Tables C403.3.2(2) and C403.3.2(14). | | --- | --- |

C402.1.2.1 Standalone elevator hoistways. Elevator hoistways that comply with all of the following shall be exempt from the building thermal envelope and envelope air barrier provisions of this code:

1. Are separate from any other conditioned spaces in the building (do not serve or open into any conditioned, semi-heated or indirectly conditioned space).

2. Have heating and/or cooling equipment sized only to serve the expected elevator loads with thermostat setpoints restricted to heating to no higher than 40°F and cooling to no lower than 95°F.

3. Have an area weighted average wall, roof and floor (where applicable) U-factor of less than or equal to 0.20. Calculations must include any floor-slab-edges that penetrate the hoistway and thus are considered part of the above-grade walls.

History

• Statutory Authority: RCW 19.27A.020, 19.27A.025, 19.27A.160 and chapters 19.27A and 19.27 RCW. WSR 22-14-091, 23-12-101, and 23-20-021, § 51-11C-40212, filed 7/1/22, 6/7/23, and 9/25/23, effective 3/15/24. Statutory Authority: RCW 19.27A.020, 19.27A.025, 19.27A.160 and chapter 19.27 RCW. WSR 19-24-040, § 51-11C-40212, filed 11/26/19, effective 7/1/20. Statutory Authority: RCW 19.27A.025, 19.27A.160, and 19.27.074. WSR 16-03-072, § 51-11C-40212, filed 1/19/16, effective 7/1/16. Statutory Authority: RCW 19.27A.020, 19.27A.025 and chapters 19.27 and 34.05 RCW. WSR 13-04-056, § 51-11C-40212, filed 2/1/13, effective 7/1/13.

Wash. Admin. Code § 51-11C-402121 Table C402.1.3—Opaque thermal envelope assembly R-value requirements.

Table C402.1.3

Opaque Thermal Envelope Insulation Component

Minimum Requirements, R-value Methoda, j

| CLIMATE ZONE | 5 AND MARINE 4 | | | --- | --- | --- | | | All Other | Group R | | Roofs | | | | Insulation entirely above deck | R-38ci | R-38ci | | Metal buildingsb | R-25 + R-22 LS | R-25 + R-22 LS | | Attic and other | R-49 | R-49 | | Walls, Above Gradei | | | | Massh | R-9.5cci | R-13.3ci | | Mass transfer deck slab edgeg | | | | Metal buildings | R-13 + R-14ci | R-13 + R-14ci | | Steel framed | R-13 + R-10ci | R-19 + R-8.5ci | | Wood framed and other | R-13 + R-7.5ci std or R-20 + R-3.8ci std | R-13 + R-7.5ci std or R-20 + R-3.8ci std or R-25 std | | Walls, Below Grade | | | | Below-grade walld,h | Same as above grade | Same as above grade | | Floors | | | | Massf | R-30ci | R-30ci | | Joist/framing | R-30e | R-30e | | Slab-on-Grade Floors | | | | Unheated slabs | R-10 for 24" below | R-10 for 24" below | | Heated slabs | R-10 perimeter & under entire slab | R-10 perimeter & under entire slab |

| For SI: | 1 inch = 25.4 mm. ci = Continuous insulation. NR = No requirement. | | --- | --- | | LS = | Liner system—A continuous membrane installed below the purlins and uninterrupted by framing members. Uncompressed, unfaced insulation rests on top of the membrane between the purlins. | | a | Assembly descriptions can be found in Chapter 2 and Appendix A. | | b | Where using R-value compliance method, a thermal spacer block with minimum thickness of 1/2-inch and minimum R-value of R-3.5 shall be provided, otherwise use the U-factor compliance method in Table C402.1.4. | | c | Exception: Integral insulated concrete block walls complying with ASTM C90 with all cores filled and meeting both of the following: | | | 1. At least 50 percent of cores must be filled with vermiculite or equivalent fill insulation; and | | | 2. The building thermal envelope encloses one or more of the following uses: Warehouse (storage and retail), gymnasium, auditorium, church chapel, arena, kennel, manufacturing plant, indoor swimming pool, pump station, water and waste water treatment facility, storage facility, storage area, motor vehicle service facility. Where additional uses not listed (such as office, retail, etc.) are contained within the building, the exterior walls that enclose these areas may not utilize this exception and must comply with the appropriate mass wall R-value from Table C402.1.3/U-factor from Table C402.1.4. | | d | Where heated slabs are below grade, they shall comply with the insulation requirements for heated slabs. | | e | Steel floor joist systems shall be insulated to R-38 + R-10ci. | | f | "Mass floors" shall include floors weighing not less than: | | | 1. 35 pounds per square foot of floor surface area; or | | | 2. 25 pounds per square foot of floor surface area where the material weight is not more than 120 pounds per cubic foot. | | g | Component performance in accordance with Section C402.1.5 shall be required for buildings with a mass transfer deck slab. | | h | Peripheral edges of intermediate concrete floors are included in the above-grade mass wall category and therefore must be insulated as above-grade mass walls unless they meet the definition of Mass Transfer Deck Slab Edge. The area of the peripheral edges of concrete floors shall be defined as the thickness of the slab multiplied by the perimeter length of the edge condition. See Table A103.3.7.2 for typical default U-factors for above-grade slab edges and footnote c for typical conditions of above-grade slab edges. | | i | Where the total area of through-wall mechanical equipment is greater than 1 percent of the opaque above-grade wall area, use of the R-value method is not permitted. See Section C402.1.4.3. | | j | For roof, wall or floor assemblies where the proposed assembly would not be continuous insulation, alternate nominal R-value compliance options for assemblies with isolated metal fasteners that penetrate otherwise continuous insulation are as shown in columns B and C of Table C402.1.3 (j): |

Table C402.1.3 (j)

Continuous Insulation Equivalents

| Column A | Column B | Column C | | --- | --- | --- | | Assemblies with continuous insulation (see definition) | Alternate option for assemblies with metal penetrations, greater than 0.04% but less than 0.08% | Alternate option for assemblies with metal penetrations, greater than or equal to 0.08% but less than 0.12% | | R-9.5ci | R-11.9ci | R-13ci | | R-11.4ci | R-14.3ci | R-15.7ci | | R-13.3ci | R-16.6ci | R-18.3ci | | R-15.2ci | R-19ci | R-21ci | | R-30ci | R-38ci | R-42ci | | R-38ci | R-48ci | R-53ci | | R-13 + R-7.5ci | R-13 + R-9.4ci | R-13 + R-10.3ci | | R-13 + R-10ci | R-13 + R-12.5ci | R-13 + R-13.8ci | | R-13 + R-12.5ci | R-13 + R-15.6ci | R-13 + R-17.2ci | | R-13 + R-13ci | R-13 + R-16.3ci | R-13 + R-17.9ci | | R-19 + R-8.5ci | R-19 + R-10.6ci | R-19 + R-11.7ci | | R-19 + R-14ci | R-19 + R-17.5ci | R-19 + R-19.2ci | | R-19 + R-16ci | R-19 + R-20ci | R-19 + R-22ci | | R-20 + R-3.8ci | R-20 + R-4.8ci | R-20 + R-5.3ci | | R-21 + R-5ci | R-21 + R-6.3ci | R-21 + R-6.9ci |

| Notes for Table C402.1.3(j) | | | --- | --- | | | These alternate nominal R-value compliance options are allowed for projects complying with all of the following: | | 1a. | The ratio of the cross-sectional area, as measured in the plane of the surface, of metal penetrations of otherwise continuous insulation to the opaque surface area of the assembly is greater than 0.0004 (0.04%), but less than 0.0008 (0.08%), for use of Column B equivalents, and greater than or equal to 0.0008 (0.08%), but less than 0.0012 (0.12%), for use of Column C equivalents. | | 1b. | Where all metal penetrations are stainless steel, Column B is permitted to be used for penetrations greater than 0.12%, but less than 0.24% of opaque surface area, and Column C is permitted to be used for penetrations greater than or equal to 0.24%, but less than 0.48% of opaque surface area. | | 2. | The metal penetrations of otherwise continuous insulation are isolated or discontinuous (e.g., brick ties or other discontinuous metal attachments, offset brackets supporting shelf angles that allow insulation to go between the shelf angle and the primary portions of the wall structure). No continuous metal elements (e.g., metal studs, z-girts, z-channels, shelf angles) penetrate the otherwise continuous portion of the insulation. | | 3. | Building permit drawings shall contain details showing the locations and dimensions of all the metal penetrations (e.g., brick ties or other discontinuous metal attachments, offset brackets, etc.) of otherwise continuous insulation. In addition, calculations shall be provided showing the ratio of the cross-sectional area of metal penetrations of otherwise continuous insulation to the overall opaque wall area. |

For other cases where the proposed assembly is not continuous insulation, see Section C402.1.4 for determination of U-factors for assemblies that include metal other than screws and nails.

History

• Statutory Authority: RCW 19.27A.045 and chapter 19.27A RCW. WSR 24-16-145, § 51-11C-402121, filed 8/7/24, effective 9/7/24. Statutory Authority: RCW 19.27A.020, 19.27A.025, 19.27A.160 and chapters 19.27A and 19.27 RCW. WSR 22-14-091, 23-12-101, and 23-20-021, § 51-11C-402121, filed 7/1/22, 6/7/23, and 9/25/23, effective 3/15/24. Statutory Authority: RCW 19.27A.020, 19.27A.025, 19.27A.160 and chapter 19.27 RCW. WSR 19-24-040, § 51-11C-402121, filed 11/26/19, effective 7/1/20. Statutory Authority: RCW 19.27A.025, 19.27A.045, 19.27A.160, and 19.27.074. WSR 16-24-070, § 51-11C-402121, filed 12/6/16, effective 5/1/17. Statutory Authority: RCW 19.27A.025, 19.27A.160, and 19.27.074. WSR 16-03-072, § 51-11C-402121, filed 1/19/16, effective 7/1/16. Statutory Authority: RCW 19.27A.020, 19.27A.025 and chapters 19.27 and 34.05 RCW. WSR 13-04-056, § 51-11C-402121, filed 2/1/13, effective 7/1/13.

Wash. Admin. Code § 51-11C-40213 Section C402.1.3—Insulation component R-value method.

C402.1.3 Insulation component R-value-based method.Building thermal envelope opaque assemblies shall comply with the requirements of Section C402.2 based on the climate zone specified in Chapter 3. For opaque portions of the building thermal envelope intended to comply on an insulation component R-value basis, the R-values for cavity insulation and continuous insulation shall not be less than that specified in Table C402.1.3. Where cavity insulation is installed in multiple layers, the cavity insulation R-values shall be summed to determine compliance with the cavity insulation R-value requirements. Where continuous insulation is installed in multiple layers, the continuous insulation R-values shall be summed to determine compliance with the continuous insulation R-value requirements. Cavity insulation R-values shall not be used to determine compliance with the continuous insulation R-value requirements in Table C402.1.3. Commercial buildings or portions of commercial buildings enclosing Group R occupancies shall use the R-values from the "Group R" column of Table C402.1.3. Commercial buildings or portions of commercial buildings enclosing occupancies other than Group R shall use the R-values from the "All other" column of Table C402.1.3.

History

• Statutory Authority: RCW 19.27A.020, 19.27A.025, 19.27A.160 and chapters 19.27A and 19.27 RCW. WSR 22-14-091, 23-12-101, and 23-20-021, § 51-11C-40213, filed 7/1/22, 6/7/23, and 9/25/23, effective 3/15/24. Statutory Authority: RCW 19.27A.020, 19.27A.025, 19.27A.160 and chapter 19.27 RCW. WSR 19-24-040, § 51-11C-40213, filed 11/26/19, effective 7/1/20. Statutory Authority: RCW 19.27A.025, 19.27A.045, 19.27A.160, and 19.27.074. WSR 16-13-089, § 51-11C-40213, filed 6/15/16, effective 7/16/16. Statutory Authority: RCW 19.27A.025, 19.27A.160, and 19.27.074. WSR 16-03-072, § 51-11C-40213, filed 1/19/16, effective 7/1/16. Statutory Authority: RCW 19.27A.025, 19.27A.045, 19.27.020, and 19.27.074. WSR 14-24-122, § 51-11C-40213, filed 12/3/14, effective 1/3/15. Statutory Authority: RCW 19.27A.020, 19.27A.025 and chapters 19.27 and 34.05 RCW. WSR 13-04-056, § 51-11C-40213, filed 2/1/13, effective 7/1/13.

Wash. Admin. Code § 51-11C-40214 Section C402.1.4—Assembly U-factor, C-factor, or F-factor-based method.

C402.1.4 Assembly U-factor, C-factor, or F-factor-based method. Building thermal envelope opaque assemblies shall meet the requirements of Section C402.2 based on the climate zone specified in Chapter 3. Building thermal envelope opaque assemblies intended to comply on an assembly U-, C-, or F-factor basis shall have a U-, C-, or F-factor not greater than that specified in Table C402.1.4. Commercial buildings or portions of commercial buildings enclosing Group R occupancies shall use the U-, C-, or F-factor from the "Group R" column of Table C402.1.4. Commercial buildings or portions of commercial buildings enclosing occupancies other than Group R shall use the U-, C-, or F-factor from the "All other" column of Table C402.1.4. The U-factors for typical construction assemblies are included in Appendix A. These values shall be used for all calculations. Where proposed construction assemblies are not represented in Appendix A, values shall be calculated in accordance with the ASHRAE Handbook—Fundamentals using the framing factors listed in Appendix A where applicable and shall include the thermal bridging effects of framing materials.

C402.1.4.1 Roof/ceiling assembly. The maximum roof/ceiling assembly U-factor shall not exceed that specified in Table C402.1.4 based on construction materials used in the roof/ceiling assembly.

C402.1.4.1.1 Suspended ceilings. Insulation installed on suspended ceilings having removable ceiling tiles shall not be considered part of the assembly U-factor of the roof/ceiling construction.

C402.1.4.1.2 Joints staggered. Continuous insulation board shall be installed in not less than two layers, and the edge joints between each layer of insulation shall be staggered, except where insulation tapers to the roof deck at a gutter edge, roof drain, or scupper.

C402.1.4.2 Thermal resistance of cold-formed steel stud walls.U-factors of walls with cold-formed steel studs shall be permitted to be determined in accordance with Equation 4-1:

Equation 4-1:

| U = 1/[Rs + (ER)] | | | | --- | --- | --- | | Where: | | | | Rs | = | The cumulative R-value of the wall components along the path of heat transfer, excluding the cavity insulation and steel studs. | | ER | = | The effective R-value of the cavity insulation with steel studs as specified in Table C402.1.4.2. |

C402.1.4.3 Thermal resistance of mechanical equipment penetrations. When the total area of penetrations from through-wall mechanical equipment or equipment listed in Table C403.3.2(4) exceeds 1 percent of the opaque above-grade wall area, the mechanical equipment penetration area shall be calculated as a separate wall assembly with a default U-factor of 0.5. Mechanical system ducts and louvers, including those for supply, exhaust and relief, and for condenser air intake and outlet, are not considered to be mechanical equipment for the purposes of this section.

| EXCEPTION: | Where mechanical equipment has been tested in accordance with approved testing standards, the mechanical equipment penetration area is permitted to be calculated as a separate wall assembly using the U-factor determined by such test. | | --- | --- |

Reviser's note: The brackets and enclosed material in the text of the above section occurred in the copy filed by the agency.

Wash. Admin. Code § 51-11C-402141 Table C402.1.4—Opaque thermal envelope requirements, U-factor method.

Table C402.1.4

Opaque Thermal Envelope Requirementsa,f

| CLIMATE ZONE | 5 AND MARINE 4 | | | --- | --- | --- | | | All Other | Group R | | Roofs | | | | Insulation entirely above deck | U-0.027 | U-0.027 | | Metal buildings | U-0.031 | U-0.031 | | Attic and other | U-0.021 | U-0.021 | | Joist or single rafter | U-0.027 | U-0.027 | | Walls, Above Gradek | | | | Massd,g | U-0.104 | U-0.078 | | Mass transfer deck slabj | U-0.20 | U-0.20 | | Metal building | U-0.050 | U-0.050 | | Steel framed | U-0.055 | U-0.055 | | Wood framed and other | U-0.051 | U-0.051 | | Walls, Below Grade | | | | Below-grade wallb, g | Same as above grade | Same as above grade | | Floors | | | | Masse | U-0.031 | U-0.031 | | Joist/framing | U-0.029 | U-0.029 | | Slab-on-Grade Floors | | | | Unheated slabs | F-0.54 | F-0.54 | | Heated slabsc | F-0.55 | F-0.55 | | Opaque Doors | | | | Nonswinging door | U-0.31 | U-0.31 | | Swinging doorh | U-0.37 | U-0.37 | | Garage door <14% glazing | U-0.31 | U-0.31 | | Garage door ≥14% and <50% glazingi | U-0.34 | U-0.34 |

| a | Use of opaque assembly U-factors, C-factors, and F-factors from Appendix A is required unless otherwise allowed by Section C402.1.4. | | --- | --- | | b | Where heated slabs are below grade, they shall comply with the F-factor requirements for heated slabs. | | c | Heated slab F-factors shall be determined specifically for heated slabs. Unheated slab factors shall not be used. | | d | Exception: Integral insulated concrete block walls complying with ASTM C90 with all cores filled and meeting both of the following: | | | 1. At least 50 percent of cores must be filled with vermiculite or equivalent fill insulation; and | | | 2. The building thermal envelope encloses one or more of the following uses: Warehouse (storage and retail), gymnasium, auditorium, church chapel, arena, kennel, manufacturing plant, indoor swimming pool, pump station, water and waste water treatment facility, storage facility, storage area, motor vehicle service facility. Where additional uses not listed (such as office, retail, etc.) are contained within the building, the exterior walls that enclose these areas may not utilize this exception and must comply with the appropriate mass wall R-value from Table C402.1.3/U-factor from Table C402.1.4. | | e | "Mass floors" shall include floors weighing not less than: 1. 35 pounds per square foot of floor surface area; or 2. 25 pounds per square foot of floor surface area where the material weight is not more than 120 pounds per cubic foot. | | f | Opaque assembly U-factors based on designs tested in accordance with ASTM C1363 shall be permitted. The R-value of continuous insulation shall be permitted to be added or subtracted from the original test design. | | g | Peripheral edges of intermediate concrete floors are included in the above-grade mass wall category and therefore must be insulated as above-grade mass walls unless they meet the definition of Mass Transfer Deck Slab. The area of the peripheral edges of concrete floors shall be defined as the thickness of the slab multiplied by the perimeter length of the edge condition. See Table A103.3.7.2 for typical default U-factors for above-grade slab edges and footnote c for typical conditions of above-grade slab edges. | | h | Swinging door U-factors shall be determined in accordance with NFRC-100. | | i | Garage doors having a single row of fenestration shall have an assembly U-factor less than or equal to 0.44, provided that the fenestration area is not less than 14 percent and not more than 50 percent of the total door area. | | j | Component performance in accordance with Section C402.1.5 shall be required for buildings with a mass transfer deck slab. A mass transfer deck, due to its configuration, is not insulated. The table value (U-0.20) shall be used as the baseline value for component performance or total building performance path calculations. For the proposed value, the appropriate value from Table A103.3.7.2 shall be used. | | k | Through-wall mechanical equipment subject to Section C402.1.4.3 shall be calculated at the U-factor defined in Section C402.1.4.3. The area-weighted U-factor of the wall, including through-wall mechanical equipment, shall not exceed the value in the table. |

History

• Statutory Authority: RCW 19.27A.045 and chapter 19.27A RCW. WSR 24-16-145, § 51-11C-402141, filed 8/7/24, effective 9/7/24. Statutory Authority: RCW 19.27A.020, 19.27A.025, 19.27A.160 and chapters 19.27A and 19.27 RCW. WSR 22-14-091, 23-12-101, and 23-20-021, § 51-11C-402141, filed 7/1/22, 6/7/23, and 9/25/23, effective 3/15/24. Statutory Authority: RCW 19.27A.020, 19.27A.025, 19.27A.160 and chapter 19.27 RCW. WSR 19-24-040, § 51-11C-402141, filed 11/26/19, effective 7/1/20. Statutory Authority: RCW 19.27A.025, 19.27A.045, 19.27A.160, and 19.27.074. WSR 16-24-070, § 51-11C-402141, filed 12/6/16, effective 5/1/17. Statutory Authority: RCW 19.27A.025, 19.27A.160, and 19.27.074. WSR 16-03-072, § 51-11C-402141, filed 1/19/16, effective 7/1/16.

Wash. Admin. Code § 51-11C-402142 Table C402.1.4.2—Effective R-values for steel stud wall assemblies.

Table C402.1.4.2

Effective R-values For Steel Stud Wall Assemblies

| NOMINAL STUD DEPTH (inches) | SPACING OF FRAMING (inches) | CAVITYR-VALUE (insulation) | CORRECTION FACTOR (Fc) | EFFECTIVE R-VALUE (ER) (Cavity R-Value × Fc) | | | --- | --- | --- | --- | --- | --- | | | 3 1/2 | 16 | 13 | 0.46 | 5.98 | | | 15 | 0.43 | 6.45 | | | | | 3 1/2 | 24 | 13 | 0.55 | 7.15 | | | 15 | 0.52 | 7.80 | | | | | 6 | 16 | 19 | 0.37 | 7.03 | | | 21 | 0.35 | 7.35 | | | | | 6 | 24 | 19 | 0.45 | 8.55 | | | 21 | 0.43 | 9.03 | | | | | 8 | 16 | 25 | 0.31 | 7.75 | | | 24 | 25 | 0.38 | 9.50 | |

History

• Statutory Authority: RCW 19.27A.020, 19.27A.025, 19.27A.160 and chapters 19.27A and 19.27 RCW. WSR 22-14-091, 23-12-101, and 23-20-021, § 51-11C-402142, filed 7/1/22, 6/7/23, and 9/25/23, effective 3/15/24. Statutory Authority: RCW 19.27A.025, 19.27A.160, and 19.27.074. WSR 16-03-072, § 51-11C-402142, filed 1/19/16, effective 7/1/16.

Wash. Admin. Code § 51-11C-40215 Section C402.1.5—Component performance alternative.

C402.1.5 Component performance alternative. Building envelope values and fenestration areas determined in accordance with Equation 4-2 shall be permitted in lieu of compliance with the U-factors and F-factors in Table C402.1.4 and C402.4 and the maximum allowable fenestration areas in Section C402.4.1.

For buildings with more than one space conditioning category, component performance compliance shall be demonstrated separately for each space conditioning category. Interior partition ceilings, walls, fenestration and floors that separate space conditioning areas shall be applied to the component performance calculations for the space conditioning category with the highest level of space conditioning.

Equation 4-2

| Proposed Total UA ≤ Allowable Total UA | | | | --- | --- | --- | | Where: | | | | Proposed Total UA | = | UA-glaz-prop + UA sky-prop + UA-opaque-prop + FL-slab-prop | | Allowable Total UA | = | UA-glaz-allow + UA-glaz-excess + UA sky-allow + UA-sky-excess + UA-opaque-allow + FL-slab-allow | | UA-glaz-prop | = | Sum of (proposed U-value x proposed area) for each distinct vertical fenestration type, up to code maximum area | | UA-sky-prop | = | Sum of (proposed U-value x proposed area) for each distinct skylight type, up to the code maximum area | | UA-opaque-prop | = | Sum of (proposed U-value x proposed area) for each distinct opaque thermal envelope type | | FL-slab-prop | = | Sum of (proposed F-value x proposed length) for each distinct slab on grade perimeter assembly | | UA-glaz-allow | = | Sum of (code maximum vertical fenestration U-value from Table C402.4, or Section C402.4.1.1.2 if applicable, x proposed area) for each distinct vertical fenestration type, not to exceed the code maximum area1 | | UA-glaz-excess | = | U-value for the proposed wall type from Table C402.42 x vertical fenestration area in excess of the code maximum area | | UA-sky-allow | = | Sum of (code maximum skylight U-value from Table C402.4 x proposed area) for each distinct skylight type proposed, not to exceed the code maximum area | | UA-sky-excess | = | U-value for the proposed roof type from Table C402.43 x skylight area in excess of the code maximum area | | UA-opaque-allow | = | Code maximum opaque envelope U-value from Table C402.1.4 for each opaque door, wall, roof, and floor assembly x proposed area | | FL-slab-allow | = | Code maximum F-value for each slab-on-grade perimeter assembly x proposed length |

| Notes: | 1 Where multiple vertical fenestration types are proposed and the code maximum area is exceeded, the U-value shall be the average Table C402.1.4 U-value weighted by the proposed vertical fenestration area of each type. | | --- | --- | | | 2 Where multiple wall types are proposed the U-value shall be the average Table C402.1.4 U-value weighted by the proposed above grade wall area of each type. | | | 3 Where multiple roof types are proposed the U-value shall be the average Table C402.1.4 U-value weighted by the proposed roof area of each type. |

C402.1.5.1 Component U-factors and F-factors. The U-factors and F-factors for typical construction assemblies are included in Chapter 3 and Appendix A. These values shall be used for all calculations. Where proposed construction assemblies are not represented in Chapter 3 or Appendix A, values shall be calculated in accordance with the ASHRAE Handbook—Fundamentals, using the framing factors listed in Appendix A.

For envelope assemblies containing metal framing, the U-factor shall be determined by one of the following methods:

1. Results of laboratory measurements according to acceptable methods of test.

2. ASHRAE Handbook—Fundamentals where the metal framing is bonded on one or both sides to a metal skin or covering.

3. The zone method as provided in ASHRAE Handbook—Fundamentals.

4. Effective framing/cavity R-values as provided in Appendix A.

When return air ceiling plenums are employed, the roof/ceiling assembly shall:

a. For thermal transmittance purposes, not include the ceiling proper nor the plenum space as part of the assembly; and

b. For gross area purposes, be based upon the interior face of the upper plenum surface.

5. Tables in ASHRAE 90.1 Normative Appendix A.

6. Calculation method for steel-framed walls in accordance with Section C402.1.4.1 and Table C402.1.4.1.

C402.1.5.2 SHGC rate calculations. Fenestration SHGC values for individual components and/or fenestration are permitted to exceed the SHGC values in Table C402.4 and/or the maximum allowable fenestration areas in Section C402.4.1 where the proposed total SHGCxA less than the allowable total SHGCxA as determined by Equation 4-3.

Equation 4-3—SHGC Rate Calculations

| Proposed Total SHGCxA ≤ Allowable Total SHGCxA | | | | --- | --- | --- | | Where: | | | | Proposed Total SHGCxA | = | SHGCxA-glaz-prop + SHGCxA-sky-prop | | Allowable Total SHGCxA | = | SHGCxA-glaz-allow + SHGCxA-sky-allow | | SHGCxA-glaz-prop | = | Sum of (proposed SHGCx proposed area) for each distinct vertical fenestration type | | SHGCxA-sky-prop | = | Sum of (proposed SHGCx proposed area) for each distinct skylight type | | SHGCxA-glaz-allow | = | Sum of (code maximum vertical fenestration SHGC from Table C402.4, or Section C402.4.1.3 if applicable, x proposed area) for each distinct vertical fenestration type, not to exceed the code maximum area | | SHGCxA-sky-allow | = | Sum of (code maximum skylight SHGC from Table C402.4x proposed area) for each distinct skylight type, not to exceed the code maximum area |

If the proposed vertical fenestration area does not exceed the Vertical Fenestration Area allowed, the target area for each vertical fenestration type shall equal the proposed area. If the proposed vertical fenestration area exceeds the Vertical Fenestration Area allowed, the target area of each vertical fenestration element shall be reduced in the base envelope design by the same percentage and the net area of each above-grade wall type increased proportionately by the same percentage so that the total vertical fenestration area is exactly equal to the Vertical Fenestration Area allowed.

If the proposed skylight area does not exceed the Allowable Skylight Area from Section C402.4.1, the target area shall equal the proposed area. If the proposed skylight area exceeds the Allowable Skylight Area from Section C402.4.1, the area of each skylight element shall be reduced in the base envelope design by the same percentage and the net area of each roof type increased proportionately by the same percentage so that the total skylight area is exactly equal to the allowed percentage per Section C402.3.1 of the gross roof area.

History

• Statutory Authority: RCW 19.27A.020, 19.27A.025, 19.27A.160 and chapters 19.27A and 19.27 RCW. WSR 22-14-091, 23-12-101, and 23-20-021, § 51-11C-40215, filed 7/1/22, 6/7/23, and 9/25/23, effective 3/15/24. Statutory Authority: RCW 19.27A.025, 19.27A.045 and chapter 19.27 RCW. WSR 20-21-080, § 51-11C-40215, filed 10/19/20, effective 2/1/21. Statutory Authority: RCW 19.27A.020, 19.27A.025, 19.27A.160 and chapter 19.27 RCW. WSR 19-24-040, § 51-11C-40215, filed 11/26/19, effective 7/1/20. Statutory Authority: RCW 19.27A.020, 19.27A.025 and chapters 19.27A and 19.27 RCW. WSR 19-02-089, § 51-11C-40215, filed 1/2/19, effective 7/1/19. Statutory Authority: RCW 19.27A.025, 19.27A.045, 19.27A.160, and 19.27.074. WSR 17-10-062, § 51-11C-40215, filed 5/2/17, effective 6/2/17
• WSR 16-24-070, § 51-11C-40215, filed 12/6/16, effective 5/1/17
• WSR 16-13-089, § 51-11C-40215, filed 6/15/16, effective 7/16/16. Statutory Authority: RCW 19.27A.025, 19.27A.160, and 19.27.074. WSR 16-03-072, § 51-11C-40215, filed 1/19/16, effective 7/1/16.

Wash. Admin. Code § 51-11C-40220 Section C402.2—Specific insulation requirements.

C402.2 Specific building thermal envelope insulation requirements. Insulation in building thermal envelope opaque assemblies shall comply with Sections C402.2.1 through C402.2.9 and Table C402.1.3.

Where this section refers to installing insulation levels as specified in Section C402.1.3, assemblies complying prescriptively with Section C402.1.4 and buildings complying with Section C402.1.5 are allowed to install alternate levels of insulation so long as the U-factor of the insulated assembly is less than or equal to the U-factor required by the respective path.

History

• Statutory Authority: RCW 19.27A.045 and chapter 19.27A RCW. WSR 24-16-145, § 51-11C-40220, filed 8/7/24, effective 9/7/24. Statutory Authority: RCW 19.27A.020, 19.27A.025, 19.27A.160 and chapters 19.27A and 19.27 RCW. WSR 22-14-091, 23-12-101, and 23-20-021, § 51-11C-40220, filed 7/1/22, 6/7/23, and 9/25/23, effective 3/15/24. Statutory Authority: RCW 19.27A.020, 19.27A.025, 19.27A.160 and chapter 19.27 RCW. WSR 19-24-040, § 51-11C-40220, filed 11/26/19, effective 7/1/20. Statutory Authority: RCW 19.27A.025, 19.27A.045, 19.27A.160, and 19.27.074. WSR 16-24-070, § 51-11C-40220, filed 12/6/16, effective 5/1/17. Statutory Authority: RCW 19.27A.025, 19.27A.160, and 19.27.074. WSR 16-03-072, § 51-11C-40220, filed 1/19/16, effective 7/1/16. Statutory Authority: RCW 19.27A.020, 19.27A.025 and chapters 19.27 and 34.05 RCW. WSR 13-04-056, § 51-11C-40220, filed 2/1/13, effective 7/1/13.

Wash. Admin. Code § 51-11C-40221 Section C402.2.1—Roof assembly.

C402.2.1Roof assembly. The minimum thermal resistance (R-value) of the insulating material installed either between the roof framing or continuously on the roof assembly shall be as specified in Table C402.1.3, based on construction materials used in the roof assembly.

| EXCEPTIONS: | 1. Where tapered insulation is used with insulation entirely above deck, those roof assemblies shall show compliance on a U-factor basis per Section C402.1.4. The effective U-factor shall be determined through the use of Tables A102.2.6(1), A102.2.6(2) and A102.2.6(3). | | --- | --- | | | 2. Two layers of insulation are not required where insulation tapers to the roof deck, such as at roof drains. At roof drains, the immediate 24 inch by 24 inch plan area around each roof drain has a minimum insulation requirement of R-13, but otherwise is permitted to be excluded from the roof insulation area-weighted calculations. |

C402.2.1.1 Minimum thickness, lowest point. The minimum thickness of above-deck roof insulation at its lowest point, gutter edge, roof drain or scupper, shall be not less than 1 inch (25 mm).

C402.2.1.2 Suspended ceilings. Insulation installed on suspended ceilings having removable ceiling tiles shall not be considered part of the minimum thermal resistance (R-value) of roof insulation in roof/ceiling construction.

C402.2.1.3 Skylight curbs. Skylight curbs shall be insulated to the level of roofs with insulation entirely above deck or R-5, whichever is less.

| EXCEPTION: | Unit skylight curbs included as a component of a skylight listed and labeled in accordance with NFRC 100 shall not be required to be insulated. | | --- | --- |

C402.2.1.4 Rooftop HVAC equipment curbs. Structural curbs installed to support rooftop HVAC equipment are allowed to interrupt the above roof insulation. The area under the HVAC equipment inside of the equipment curb shall be insulated to a minimum of R-13 in all locations where there are not roof openings for ductwork. The annular space between the roof opening and the ductwork shall be sealed to maintain the building air barrier. The plan-view area of the HVAC equipment curb shall be excluded from the prescriptive roof insulation requirements or the area-weighted component performance calculations.

History

• Statutory Authority: RCW 19.27A.020, 19.27A.025, 19.27A.160 and chapters 19.27A and 19.27 RCW. WSR 22-14-091, 23-12-101, and 23-20-021, § 51-11C-40221, filed 7/1/22, 6/7/23, and 9/25/23, effective 3/15/24. Statutory Authority: RCW 19.27A.020, 19.27A.025, 19.27A.160 and chapter 19.27 RCW. WSR 19-24-040, § 51-11C-40221, filed 11/26/19, effective 7/1/20. Statutory Authority: RCW 19.27A.025, 19.27A.160, and 19.27.074. WSR 16-03-072, § 51-11C-40221, filed 1/19/16, effective 7/1/16. Statutory Authority: RCW 19.27A.020, 19.27A.025 and chapters 19.27 and 34.05 RCW. WSR 13-04-056, § 51-11C-40221, filed 2/1/13, effective 7/1/13.

Wash. Admin. Code § 51-11C-402211 Reserved.

History

• Statutory Authority: RCW 19.27A.020, 19.27A.025, 19.27A.160 and chapters 19.27A and 19.27 RCW. WSR 22-14-091, 23-12-101, and 23-20-021, § 51-11C-402211, filed 7/1/22, 6/7/23, and 9/25/23, effective 3/15/24. Statutory Authority: RCW 19.27A.020, 19.27A.025, 19.27A.160 and chapter 19.27 RCW. WSR 19-24-040, § 51-11C-402211, filed 11/26/19, effective 7/1/20. Statutory Authority: RCW 19.27A.025, 19.27A.160, and 19.27.074. WSR 16-03-072, § 51-11C-402211, filed 1/19/16, effective 7/1/16. Statutory Authority: RCW 19.27A.020, 19.27A.025 and chapters 19.27 and 34.05 RCW. WSR 13-04-056, § 51-11C-402211, filed 2/1/13, effective 7/1/13.

Wash. Admin. Code § 51-11C-40222 Section C402.2.2—Above-grade walls.

C402.2.2 Above-grade walls. The minimum thermal resistance (R-value) of materials installed in the wall cavity between the framing members and continuously on the walls shall be as specified in Table C402.1.3, based on framing type and construction materials used in the wall assembly. The R-value of integral insulation installed in concrete masonry units (CMU) shall not be used in determining compliance with Table C402.1.3 except as otherwise noted in the table. In determining compliance with Table C402.1.4, the use of the U-factor of concrete masonry units with integral insulation shall be permitted.

"Mass walls" where used as a component in the thermal envelope of a building shall comply with one of the following:

1. Weigh not less than 35 psf (170 kg/m2) of wall surface area.

2. Weigh not less than 25 psf (120 kg/m2) of wall surface area where the material weight is not more than 120 pounds per cubic foot (pcf) (1,900 kg/m3).

3. Have a heat capacity exceeding 7 Btu/ft2 × °F (144 kJ/m2 × K).

4. Have a heat capacity exceeding 5 Btu/ft2 × °F (103 kJ/m2 × K) where the material weight is not more than 120 pcf (1900 kg/m3).

History

• Statutory Authority: RCW 19.27A.020, 19.27A.025, 19.27A.160 and chapters 19.27A and 19.27 RCW. WSR 22-14-091, 23-12-101, and 23-20-021, § 51-11C-40222, filed 7/1/22, 6/7/23, and 9/25/23, effective 3/15/24. Statutory Authority: RCW 19.27A.020, 19.27A.025, 19.27A.160 and chapter 19.27 RCW. WSR 19-24-040, § 51-11C-40222, filed 11/26/19, effective 7/1/20. Statutory Authority: RCW 19.27A.025, 19.27A.160, and 19.27.074. WSR 16-03-072, § 51-11C-40222, filed 1/19/16, effective 7/1/16. Statutory Authority: RCW 19.27A.020, 19.27A.025 and chapters 19.27 and 34.05 RCW. WSR 13-04-056, § 51-11C-40222, filed 2/1/13, effective 7/1/13.

Wash. Admin. Code § 51-11C-40223 Section C402.2.3—Floors.

C402.2.3 Floors. The thermal properties (component R-values or assembly U- or F-factors) of floor assemblies over outdoor air or unconditioned space shall be as specified in Table C402.1.3 or C402.1.4 based on the construction materials used in the floor assembly. Floor framing cavity insulation or structural slab insulation shall be installed to maintain permanent contact with the underside of the subfloor decking or structural slabs.

"Mass floors" where used as a component of the thermal envelope of a building shall provide one of the following weights:

1. Thirty-five pounds per square foot of floor surface area;

2. Twenty-five pounds per square foot of floor surface area where the material weight is not more than 120 pounds per cubic foot.

| EXCEPTIONS: | 1. The floor framing cavity insulation or structural slab insulation shall be permitted to be in contact with the top side of sheathing or continuous insulation installed on the bottom side of floor assemblies where combined with insulation that meets or exceeds the minimum R-value in Table C402.1.3 for "Metal framed" or "Wood framed and other" values for "Walls, Above Grade" and extends from the bottom to the top of all perimeter floor framing or floor assembly members. | | --- | --- | | | 2. Insulation applied to the underside of concrete floor slabs shall be permitted an air space of not more than 1 inch where it turns up and is in contact with the underside of the floor under walls associated with the building thermal envelope. |

History

• Statutory Authority: RCW 19.27A.020, 19.27A.025, 19.27A.160 and chapters 19.27A and 19.27 RCW. WSR 22-14-091, 23-12-101, and 23-20-021, § 51-11C-40223, filed 7/1/22, 6/7/23, and 9/25/23, effective 3/15/24. Statutory Authority: RCW 19.27A.020, 19.27A.025, 19.27A.160 and chapter 19.27 RCW. WSR 19-24-040, § 51-11C-40223, filed 11/26/19, effective 7/1/20. Statutory Authority: RCW 19.27A.025, 19.27A.160, and 19.27.074. WSR 16-03-072, § 51-11C-40223, filed 1/19/16, effective 7/1/16. Statutory Authority: RCW 19.27A.020, 19.27A.025 and chapters 19.27 and 34.05 RCW. WSR 13-04-056, § 51-11C-40223, filed 2/1/13, effective 7/1/13.

Wash. Admin. Code § 51-11C-40224 Section C402.2.4—Slab-on-grade.

C402.2.4 Slabs-on-grade. The minimum thermal resistance (R-value) of the insulation for unheated or heated slab-on-grade floors designed in accordance with the R-value method of Section C402.1.3 shall be as specified in Table C402.1.3.

C402.2.4.1 Insulation installation. Where installed, the perimeter insulation shall be placed on the outside of the foundation or on the inside of the foundation wall. The perimeter insulation shall extend downward from the top of the slab for a minimum distance as shown in the table or to the top of the footing, whichever is less, or downward to not less than the bottom of the slab and then horizontally to the interior or exterior for the total distance shown in the table. Insulation extending away from the building shall be protected by pavement or by a minimum of 10 inches (254 mm) of soil. Where installed, full slab insulation shall be continuous under the entire area of the slab-on-grade floor, except at structural column locations and service penetrations. Insulation required at the heated slab perimeter shall not be required to extend below the bottom of the heated slab and shall be continuous with the full slab insulation.

| EXCEPTION: | Where the slab-on-grade floor is greater than 24 inches (61 mm) below the finished exterior grade, perimeter insulation is not required. | | --- | --- |

History

• Statutory Authority: RCW 19.27A.020, 19.27A.025, 19.27A.160 and chapters 19.27A and 19.27 RCW. WSR 22-14-091, 23-12-101, and 23-20-021, § 51-11C-40224, filed 7/1/22, 6/7/23, and 9/25/23, effective 3/15/24. Statutory Authority: RCW 19.27A.020, 19.27A.025, 19.27A.160 and chapter 19.27 RCW. WSR 19-24-040, § 51-11C-40224, filed 11/26/19, effective 7/1/20. Statutory Authority: RCW 19.27A.025, 19.27A.160, and 19.27.074. WSR 16-03-072, § 51-11C-40224, filed 1/19/16, effective 7/1/16. Statutory Authority: RCW 19.27A.020, 19.27A.025 and chapters 19.27 and 34.05 RCW. WSR 13-04-056, § 51-11C-40224, filed 2/1/13, effective 7/1/13.

Wash. Admin. Code § 51-11C-40225 Section C402.2.5—Below-grade walls.

C402.2.5 Below-grade walls. The R-value of the insulating material installed in, or continuously on, the below-grade walls shall be in accordance with Table C402.1.3. The U-factor or R-value required shall extend to the level of the lowest floor of the conditioned space enclosed by the below-grade wall.

History

• Statutory Authority: RCW 19.27A.020, 19.27A.025, 19.27A.160 and chapters 19.27A and 19.27 RCW. WSR 22-14-091, 23-12-101, and 23-20-021, § 51-11C-40225, filed 7/1/22, 6/7/23, and 9/25/23, effective 3/15/24. Statutory Authority: RCW 19.27A.020, 19.27A.025, 19.27A.160 and chapter 19.27 RCW. WSR 19-24-040, § 51-11C-40225, filed 11/26/19, effective 7/1/20. Statutory Authority: RCW 19.27A.025, 19.27A.045, 19.27A.160, and 19.27.074. WSR 16-13-089, § 51-11C-40225, filed 6/15/16, effective 7/16/16. Statutory Authority: RCW 19.27A.025, 19.27A.160, and 19.27.074. WSR 16-03-072, § 51-11C-40225, filed 1/19/16, effective 7/1/16. Statutory Authority: RCW 19.27A.020, 19.27A.025 and chapters 19.27 and 34.05 RCW. WSR 13-04-056, § 51-11C-40225, filed 2/1/13, effective 7/1/13.

Wash. Admin. Code § 51-11C-40226 Section C402.2.6—Insulation of radiant heating systems.

C402.2.6 Insulation of radiant heating systems.Radiant heating system panels, and their associated components that are installed in interior or exterior assemblies shall be insulated to an R-value of not less than R-3.5 on all surfaces not facing the space being heated. Radiant heating system panels that are installed in the building thermal envelope shall be separated from the exterior of the building or unconditioned or exempt spaces by not less than the R-value of insulation installed in the opaque assembly in which they are installed or the assembly shall comply with Section C402.1.4.

| EXCEPTION: | Heated slabs on grade insulated in accordance with Section C402.2.4. | | --- | --- |

History

• Statutory Authority: RCW 19.27A.020, 19.27A.025, 19.27A.160 and chapters 19.27A and 19.27 RCW. WSR 22-14-091, 23-12-101, and 23-20-021, § 51-11C-40226, filed 7/1/22, 6/7/23, and 9/25/23, effective 3/15/24. Statutory Authority: RCW 19.27A.025, 19.27A.160, and 19.27.074. WSR 16-03-072, § 51-11C-40226, filed 1/19/16, effective 7/1/16. Statutory Authority: RCW 19.27A.020, 19.27A.025 and chapters 19.27 and 34.05 RCW. WSR 13-04-056, § 51-11C-40226, filed 2/1/13, effective 7/1/13.

Wash. Admin. Code § 51-11C-40227 Section C402.2.7—Airspaces.

C402.2.7 Airspaces. Where the R-value of an airspace is used for compliance in accordance with Section C401.2, the airspace shall be enclosed in an unventilated cavity constructed to minimize airflow into and out of the enclosed airspace. Airflow shall be deemed minimized where the enclosed airspace is located on the interior side of the continuous air barrier and is bounded on all sides by building components.

| EXCEPTION: | The thermal resistance of airspaces located on the exterior side of the continuous air barrier and adjacent to and behind the exterior wall covering material shall be determined in accordance with ASTM C1363 modified with an airflow entering the bottom and exiting the top of the airspace at a minimum air movement rate of not less than 70 mm/sec. | | --- | --- |

History

• Statutory Authority: RCW 19.27A.020, 19.27A.025, 19.27A.160 and chapters 19.27A and 19.27 RCW. WSR 22-14-091, 23-12-101, and 23-20-021, § 51-11C-40227, filed 7/1/22, 6/7/23, and 9/25/23, effective 3/15/24. Statutory Authority: RCW 19.27A.020, 19.27A.025, 19.27A.160 and chapter 19.27 RCW. WSR 19-24-040, § 51-11C-40227, filed 11/26/19, effective 7/1/20. Statutory Authority: RCW 19.27A.025, 19.27A.160, and 19.27.074. WSR 16-03-072, § 51-11C-40227, filed 1/19/16, effective 7/1/16. Statutory Authority: RCW 19.27A.020, 19.27A.025 and chapters 19.27 and 34.05 RCW. WSR 13-04-056, § 51-11C-40227, filed 2/1/13, effective 7/1/13.

Wash. Admin. Code § 51-11C-40228 Section C402.2.8—Above-grade exterior concrete slabs.

C402.2.8 Above-grade exterior concrete slabs. Above-grade concrete slabs that penetrate the building thermal envelope including, but not limited to, decks and balconies, shall each include a minimum R-10 thermal break, aligned with the primary insulating layer in the adjoining wall assemblies. Stainless steel (but not carbon steel) reinforcing bars are permitted to penetrate the thermal break. If the total building performance path or the component performance alternative in Section C402.1.5 is utilized and the thermal break required by this section is not provided where concrete slabs penetrate the building thermal envelope, the sectional area of the penetration shall be assigned the default U-factors from the "exposed concrete" row of Table A103.3.7.2.

| EXCEPTION: | Mass transfer deck slabs. | | --- | --- |

History

• Statutory Authority: RCW 19.27A.020, 19.27A.025, 19.27A.160 and chapters 19.27A and 19.27 RCW. WSR 22-14-091, 23-12-101, and 23-20-021, § 51-11C-40228, filed 7/1/22, 6/7/23, and 9/25/23, effective 3/15/24. Statutory Authority: RCW 19.27A.020, 19.27A.025, 19.27A.160 and chapter 19.27 RCW. WSR 19-24-040, § 51-11C-40228, filed 11/26/19, effective 7/1/20. Statutory Authority: RCW 19.27A.025, 19.27A.160, and 19.27.074. WSR 16-03-072, § 51-11C-40228, filed 1/19/16, effective 7/1/16. Statutory Authority: RCW 19.27A.020, 19.27A.025 and chapters 19.27 and 34.05 RCW. WSR 13-04-056, § 51-11C-40228, filed 2/1/13, effective 7/1/13.

Wash. Admin. Code § 51-11C-40229 Section C402.2.9—Vertical fenestration intersection with opaque walls.

C402.2.9 Vertical fenestration intersection with opaque walls.Vertical fenestration shall comply with Items 1, 2, and 3, as applicable.

1. Where wall assemblies include continuous insulation, the exterior glazing layer of vertical fenestration and any required thermal break in the frame shall each be aligned within 2 inches laterally of either face of the continuous insulation layer.

2. Where wall assemblies do not include continuous insulation, the exterior glazing layer of vertical fenestration and any required thermal break in the frame shall each be aligned within the thickness of the wall insulation layer and not more than 2 inches laterally from the exterior face of the outermost insulation layer.

3. Where the exterior face of the vertical fenestration frame does not extend to the exterior face of the opaque wall rough opening, the exposed exterior portion of the rough opening shall be covered with either a material having an R-value not less than R-3, or with minimum 1.5-inch thickness wood.

History

• Statutory Authority: RCW 19.27A.020, 19.27A.025, 19.27A.160 and chapters 19.27A and 19.27 RCW. WSR 22-14-091, 23-12-101, and 23-20-021, § 51-11C-40229, filed 7/1/22, 6/7/23, and 9/25/23, effective 3/15/24.

Wash. Admin. Code § 51-11C-40230 Section C402.4—Fenestration.

C402.3 Reserved.

C402.4 Fenestration. Fenestration shall comply with Sections C402.4 through C402.4.4 and Table C402.4. Daylight responsive controls shall comply with this section and Section C405.2.5.

History

• Statutory Authority: RCW 19.27A.020, 19.27A.025, 19.27A.160 and chapters 19.27A and 19.27 RCW. WSR 22-14-091, 23-12-101, and 23-20-021, § 51-11C-40230, filed 7/1/22, 6/7/23, and 9/25/23, effective 3/15/24. Statutory Authority: RCW 19.27A.020, 19.27A.025, 19.27A.160 and chapter 19.27 RCW. WSR 19-24-040, § 51-11C-40230, filed 11/26/19, effective 7/1/20. Statutory Authority: RCW 19.27A.025, 19.27A.160, and 19.27.074. WSR 16-03-072, § 51-11C-40230, filed 1/19/16, effective 7/1/16. Statutory Authority: RCW 19.27A.020, 19.27A.025 and chapters 19.27 and 34.05 RCW. WSR 13-04-056, § 51-11C-40230, filed 2/1/13, effective 7/1/13.

Wash. Admin. Code § 51-11C-402300 Table C402.4—Building envelope requirements—Fenestration.

Table C402.4

Building Envelope Fenestration Maximum U-factor and SHGC Requirements

| CLIMATE ZONE | 5 AND MARINE 4 | | | --- | --- | --- | | U-factor for Class AW windows rated in accordance with AAMA/CSA101/I.S.2/A440, vertical curtain walls and site-built fenestration productsa | | | | FixedbU-factor | U-0.34 | | | OperablecU-factor | U-0.36 | | | Entrance doorsd | | | | U-factor | U-0.60 | | | U-factor for all other vertical fenestration | | | | Fixed U-factor | U-0.26 | | | Operable or mulled windows with fixed and operable sections U-factor | U-0.28 | | | SHGC for all vertical fenestrationf | | | | | Fixed | Operable | | PF < 0.2 | 0.38 | 0.33 | | 0.2 ≤ PF < 0.5 | 0.46 | 0.40 | | PF ≥ 0.5 | 0.61 | 0.53 | | Skylights | | | | U-factor | U-0.50 | | | SHGC | 0.35 | |

| a | U-factor and SHGC shall be rated in accordance with NFRC 100. | | --- | --- | | b | "Fixed" includes curtain wall, storefront, picture windows, and other fixed windows. | | c | "Operable" includes openable fenestration products other than "entrance doors." | | d | "Entrance door" includes glazed swinging entrance doors. Other doors which are not entrance doors, including sliding glass doors, are considered "operable." | | e | Reserved. | | f | Fenestration that is entirely within the conditioned space or is between conditioned and other enclosed space is exempt from solar heat gain coefficient requirements and not included in the SHGC calculation. |

History

• Statutory Authority: RCW 19.27A.045 and chapter 19.27A RCW. WSR 24-16-145, § 51-11C-402300, filed 8/7/24, effective 9/7/24. Statutory Authority: RCW 19.27A.020, 19.27A.025, 19.27A.160 and chapters 19.27A and 19.27 RCW. WSR 22-14-091, 23-12-101, and 23-20-021, § 51-11C-402300, filed 7/1/22, 6/7/23, and 9/25/23, effective 3/15/24. Statutory Authority: RCW 19.27A.020, 19.27A.025, 19.27A.160 and chapter 19.27 RCW. WSR 19-24-040, § 51-11C-402300, filed 11/26/19, effective 7/1/20. Statutory Authority: RCW 19.27A.025, 19.27A.160, and 19.27.074. WSR 16-03-072, § 51-11C-402300, filed 1/19/16, effective 7/1/16. Statutory Authority: RCW 19.27A.020, 19.27A.025 and chapters 19.27 and 34.05 RCW. WSR 13-04-056, § 51-11C-402300, filed 2/1/13, effective 7/1/13.

Wash. Admin. Code § 51-11C-40231 Section C402.4.1—Maximum area.

C402.4.1 Maximum area. The total building vertical fenestration area (not including opaque doors and opaque spandrel panels) shall not exceed 30 percent of the total building gross above-grade wall area. The skylight area shall not exceed 5 percent of the total building gross roof area (skylight-to-roof ratio).

For buildings with more than one space conditioning category, compliance with the maximum allowed window-to-wall ratio and skylight-to-roof ratio shall be demonstrated separately for each space conditioning category. Interior partition ceiling, wall, fenestration and floor areas that separate space conditioning areas shall not be applied to the window-to-wall ratio and skylight-to-roof ratio calculations.

C402.4.1.1 Vertical fenestration maximum area withhigh performance alternates. For buildings that comply with Section C402.4.1.1.1 or C402.4.1.1.2, the total building vertical fenestration area is permitted to exceed 30 percent but shall not exceed 40 percent of the gross above grade wall area for the purpose of prescriptive compliance with Section C402.1.4.

When determining compliance using the component performance alternative in accordance with Section C402.1.5, the total building vertical fenestration area allowed in Equation 4-2 is 40 percent of the above grade wall area for buildings that comply with the vertical fenestration alternates described in this section.

C402.4.1.1.1 Optimized daylighting. All of the following requirements shall be met:

1. Not less than 50 percent of the total conditioned floor area in the building is within a daylight zone that includes daylight responsive controls complying with Section C405.2.5.1.

2. Visible transmittance (VT) of all vertical fenestration in the building is greater than or equal to 1.1 times the required solar heat gain coefficient (SHGC) in accordance with Section C402.4, or 0.50, whichever is greater. It shall be permitted to demonstrate compliance based on the area weighted average VT being greater than or equal to the area weighted average of the minimum VT requirements.

| EXCEPTION: | Fenestration that is outside the scope of NFRC 200 is not required to comply with Item 2. | | --- | --- |

C402.4.1.1.2 High-performance fenestration. All of the following requirements shall be met:

1. All vertical fenestration in the building shall comply with the following U-factors:

1.1 U-factor for Class AW windows rated in accordance with AAMA/CSA101/I.S.2/A440, vertical curtain walls and site-built fenestration products (fixed) = 0.31

1.2 U-factor for Class AW windows rated in accordance with AAMA/CSA101/I.S.2/A440, vertical curtain walls and site-built fenestration products (operable) = 0.36

1.3 Entrance doors = 0.60

1.4 U-factor for all other vertical fenestration, fixed = 0.23

1.5 U-factor for all other vertical fenestration, operable, or mulled windows with fixed and operable sections = 0.24

2. The SHGC of the vertical fenestration shall be no more than 0.90 times the maximum SHGC values listed in Table C402.4.

An area-weighted average shall be permitted to satisfy the U-factor requirement for each fenestration product category listed in Item 1 of this section. Individual fenestration products from different fenestration product categories shall not be combined in calculating the area-weighted average U-factor, except that fenestration from lines a. and b. are permitted to be combined.

History

• Statutory Authority: RCW 19.27A.045 and chapter 19.27A RCW. WSR 24-16-145, § 51-11C-40231, filed 8/7/24, effective 9/7/24. Statutory Authority: RCW 19.27A.020, 19.27A.025, 19.27A.160 and chapters 19.27A and 19.27 RCW. WSR 22-14-091, 23-12-101, and 23-20-021, § 51-11C-40231, filed 7/1/22, 6/7/23, and 9/25/23, effective 3/15/24. Statutory Authority: RCW 19.27A.020, 19.27A.025, 19.27A.160 and chapter 19.27 RCW. WSR 19-24-040, § 51-11C-40231, filed 11/26/19, effective 7/1/20. Statutory Authority: RCW 19.27A.025, 19.27A.160, and 19.27.074. WSR 16-03-072, § 51-11C-40231, filed 1/19/16, effective 7/1/16. Statutory Authority: RCW 19.27A.025, 19.27A.045, and 19.27.074. WSR 13-23-096, § 51-11C-40231, filed 11/20/13, effective 4/1/14. Statutory Authority: RCW 19.27A.020, 19.27A.025 and chapters 19.27 and 34.05 RCW. WSR 13-04-056, § 51-11C-40231, filed 2/1/13, effective 7/1/13.

Wash. Admin. Code § 51-11C-40232 Section C402.4.2—Minimum skylight fenestration area.

C402.4.2 Minimum skylight fenestration area. Skylights shall be provided in enclosed spaces that meet all the following criteria:

1. Floor area of enclosed spaces is greater than 2,500 square feet (232 m2).

2. Space is located directly under a roof and have a ceiling height greater than 15 feet (4572 mm) for no less than 75 percent of the ceiling area.

3. Space type is one of the following: Office, lobby, atrium, concourse, corridor, gymnasium/exercise center, convention center, automotive service, manufacturing, nonrefrigerated warehouse, retail store, distribution/sorting area, transportation, and workshop.

Skylights in these spaces are required to provide a total toplit daylight zone area not less than 50 percent of the floor area and shall provide one of the following:

1. A minimum ratio of skylight area to toplit daylight zone area under skylights of not less than 3 percent where all skylights have a VT of at least 0.40, or VTannual of not less than 0.26, as determined in accordance with Section C303.1.3.

2. A minimum skylight effective aperture, determined in accordance with Equation 4-5, of:

2.1. Not less than 1 percent using a skylight's VT rating; or

2.2. Not less than 0.66 percent using a tubular daylight device's VTannual rating.

| | Skylight Effective Aperture | = | (0.85 x Skylight Area x Skylight VT x WF)/ Toplit daylight zone | | | --- | --- | --- | --- | --- |

(Equation 4-5)

| Where: | | | | --- | --- | --- | | Skylight area | = | Total fenestration area of skylights. | | Skylight VT | = | Area weighted average visible transmittance of skylights. | | WF | = | Area weighted average well factor, where well factor is 0.9 if light well depth is less than 2 feet (610 mm), or 0.7 if light well depth is 2 feet (610 mm) or greater, or 1.0 for tubular daylighting devices (TDD) with VTannual ratings measured in accordance with NFRC 203. | | Light well depth | = | Measure vertically from the underside of the lowest point of the skylight glazing to the ceiling plane under the skylight. |

| EXCEPTIONS: | 1. Skylights above daylight zones of enclosed spaces are not required in: | | --- | --- | | | 1.1. Spaces designed as storm shelters complying with ICC 500. | | | 1.2. Spaces where the designed general lighting power densities are less than 0.5 W/ft2 (5.4 W/m2) and at least 10 percent lower than the lighting power allowance in Section C405.4.2. | | | 1.3. Areas where it is documented that existing structures or natural objects block direct beam sunlight on at least half of the roof over the enclosed area for more than 1,500 daytime hours per year between 8 a.m. and 4 p.m. | | | 1.4. Spaces where the daylight zone under rooftop monitors is greater than 50 percent of the enclosed space floor area. | | | 1.5. Spaces where the total floor area minus the sidelit daylight zone area is less than 2,500 square feet (232 m2), and where the lighting in the daylight zone is controlled in accordance with Section C405.2.4.1. | | | 2. The skylight effective aperture, calculated in accordance with Equation 4-5, is permitted to be 0.66 percent in lieu of 1 percent if the VTannual of the skylight or TDD, as measured by NFRC 203, is greater than 38 percent. |

C402.4.2.1 Lighting controls in daylight zones under skylights. Daylight responsive controls shall be provided to control all electric lights within toplit daylight zones.

C402.4.2.2 Haze factor. Skylights in office, storage, automotive service, manufacturing, nonrefrigerated warehouse, retail store, and distribution/sorting area spaces shall have a glazing material or diffuser with a haze factor greater than 90 percent when tested in accordance with ASTM D 1003.

| EXCEPTION: | Skylights and tubular daylighting devices designed and installed to exclude direct sunlight entering the occupied space by the use of fixed or automated baffles, or the geometry of skylight and light well. | | --- | --- |

C402.4.2.3 Daylight zones. Daylight zones referenced in Sections C402.4.1.1 through C402.4.2.2 shall comply with Sections C405.2.5.2 and C405.2.5.3, as applicable. Daylight zones shall include toplit daylight zones and sidelit daylight zones.

History

• Statutory Authority: RCW 19.27A.045 and chapter 19.27A RCW. WSR 24-16-145, § 51-11C-40232, filed 8/7/24, effective 9/7/24. Statutory Authority: RCW 19.27A.020, 19.27A.025, 19.27A.160 and chapters 19.27A and 19.27 RCW. WSR 22-14-091, 23-12-101, and 23-20-021, § 51-11C-40232, filed 7/1/22, 6/7/23, and 9/25/23, effective 3/15/24. Statutory Authority: RCW 19.27A.020, 19.27A.025, 19.27A.160 and chapter 19.27 RCW. WSR 19-24-040, § 51-11C-40232, filed 11/26/19, effective 7/1/20. Statutory Authority: RCW 19.27A.025, 19.27A.045, 19.27A.160, and 19.27.074. WSR 16-24-070, § 51-11C-40232, filed 12/6/16, effective 5/1/17. Statutory Authority: RCW 19.27A.025, 19.27A.160, and 19.27.074. WSR 16-03-072, § 51-11C-40232, filed 1/19/16, effective 7/1/16. Statutory Authority: RCW 19.27A.020, 19.27A.025 and chapters 19.27 and 34.05 RCW. WSR 13-04-056, § 51-11C-40232, filed 2/1/13, effective 7/1/13.

Wash. Admin. Code § 51-11C-40233 Section C402.4.3—Maximum U-factor and SHGC.

C402.4.3 Maximum U-factor and SHGC. The maximum U-factor and solar heat gain coefficient (SHGC) for fenestration shall be as specified in Table C402.4.

The window projection factor shall be determined in accordance with Equation 4-6.

PF = A/B

(Equation 4-6)

| Where: | | | | --- | --- | --- | | PF | = | Projection factor (decimal). | | A | = | Distance measured horizontally from the furthest continuous extremity of any overhang, eave, or permanently attached shading device to the vertical surface of the glazing. | | B | = | Distance measured vertically from the bottom of the glazing to the underside of the overhang, eave, or permanently attached shading device. |

Where different windows or glass doors have different PF values, they shall each be evaluated separately.

C402.4.3.1 Reserved.

C402.4.3.2 Reserved.

C402.4.3.3 Dynamic glazing. Where dynamic glazing is intended to satisfy the SHGC and VT requirements of Table C402.4, the ratio of the higher to lower labeled SHGC shall be greater than or equal to 2.4, and the dynamic glazing shall be automatically controlled to modulate the amount of solar gain into the space in multiple steps. Dynamic glazing shall be considered separately from other fenestration, and area-weighted averaging with other fenestration that is not dynamic glazing shall not be permitted.

| EXCEPTION: | Dynamic glazing is not required to comply with this section where both the lower and higher labeled SHGC already comply with the requirements of Table C402.4. | | --- | --- |

C402.4.3.4 Area-weighted U-factor. An area-weighted average shall be permitted to satisfy the U-factor requirements for each fenestration product category listed in Table C402.4. Individual fenestration products from different fenestration product categories listed in Table C402.4 shall not be combined in calculating area-weighted average U-factor.

History

• Statutory Authority: RCW 19.27A.025, 19.27A.160, and 19.27.074. WSR 16-03-072, § 51-11C-40233, filed 1/19/16, effective 7/1/16. Statutory Authority: RCW 19.27A.020, 19.27A.025 and chapters 19.27 and 34.05 RCW. WSR 13-04-056, § 51-11C-40233, filed 2/1/13, effective 7/1/13.

Wash. Admin. Code § 51-11C-40234 Section C402.4.4—Doors.

C402.4.4 Doors. Opaque doors shall be considered part of the gross area of above-grade walls that are part of the building thermal envelope, including the frame. Opaque doors shall comply with Table C402.1.4. Other doors shall comply with the provisions of Section C402.4.3 for vertical fenestration.

History

• Statutory Authority: RCW 19.27A.020, 19.27A.025, 19.27A.160 and chapters 19.27A and 19.27 RCW. WSR 22-14-091, 23-12-101, and 23-20-021, § 51-11C-40234, filed 7/1/22, 6/7/23, and 9/25/23, effective 3/15/24. Statutory Authority: RCW 19.27A.020, 19.27A.025, 19.27A.160 and chapter 19.27 RCW. WSR 19-24-040, § 51-11C-40234, filed 11/26/19, effective 7/1/20. Statutory Authority: RCW 19.27A.025, 19.27A.045, 19.27A.160, and 19.27.074. WSR 16-24-070, § 51-11C-40234, filed 12/6/16, effective 5/1/17. Statutory Authority: RCW 19.27A.025, 19.27A.160, and 19.27.074. WSR 16-03-072, § 51-11C-40234, filed 1/19/16, effective 7/1/16. Statutory Authority: RCW 19.27A.020, 19.27A.025 and chapters 19.27 and 34.05 RCW. WSR 13-04-056, § 51-11C-40234, filed 2/1/13, effective 7/1/13.

Wash. Admin. Code § 51-11C-40240 Section C402.5—Air leakage-thermal envelope.

C402.5 Air leakage-thermal envelope. The thermal envelope of buildings shall comply with Sections C402.5.1 through C402.5.8.

History

• Statutory Authority: RCW 19.27A.020, 19.27A.025, 19.27A.160 and chapter 19.27 RCW. WSR 19-24-040, § 51-11C-40240, filed 11/26/19, effective 7/1/20. Statutory Authority: RCW 19.27A.025, 19.27A.160, and 19.27.074. WSR 16-03-072, § 51-11C-40240, filed 1/19/16, effective 7/1/16. Statutory Authority: RCW 19.27A.020, 19.27A.025 and chapters 19.27 and 34.05 RCW. WSR 13-04-056, § 51-11C-40240, filed 2/1/13, effective 7/1/13.

Wash. Admin. Code § 51-11C-40241 Section C402.5.1—Air barriers.

C402.5.1 Air barriers. A continuous air barrier shall be provided throughout the building thermal envelope. The continuous air barriers shall be located on the inside or outside of the building thermal envelope, located within the assemblies composing the building thermal envelope, or any combination thereof. The air barrier shall comply with Sections C402.5.1.1 and C402.5.1.2.

C402.5.1.1 Air barrier construction. The continuous air barrier shall be constructed to comply with the following:

1. The air barrier shall be continuous for all assemblies that are the thermal envelope of the building and across the joints and assemblies.

2. Air barrier joints and seams shall be sealed, including sealing transitions in places and changes in materials. The joints and seals shall be securely installed in or on the joint for its entire length so as not to dislodge, loosen or otherwise impair its ability to resist positive and negative pressure from wind, stack effect and mechanical ventilation.

3. Penetrations of the air barrier shall be caulked, gasketed or otherwise sealed in a manner compatible with the construction materials and location. Sealing shall allow for expansion, contraction and mechanical vibration. Joints and seams associated with penetrations shall be sealed in the same manner or taped. Sealing materials shall be securely installed around the penetration so as not to dislodge, loosen or otherwise impair the penetrations' ability to resist positive and negative pressure from wind, stack effect, and mechanical ventilation. Sealing of concealed fire sprinklers, where required, shall be in a manner that is recommended by the manufacturer. Caulking or other adhesive sealants shall not be used to fill voids between fire sprinkler cover plates and walls or ceilings.

4. Recessed lighting fixtures shall comply with Section C402.5.8. Where similar objects are installed which penetrate the air barrier, provisions shall be made to maintain the integrity of the air barrier.

5. Construction documents shall contain a diagram showing the building's pressure boundary in plan(s) and section(s) and a calculation of the area of the pressure boundary to be considered in the test.

C402.5.1.2 Air barrier compliance. A continuous air barrier for the opaque building envelope shall comply with the following:

1. Group R dwelling units that are accessed directly from the outdoors shall meet the provisions of Section C402.5.2.

2. All other buildings or portions of buildings shall meet the provisions of Section C402.5.3.

C402.5.2 Enclosure testing for dwelling and sleeping units accessed directly from the outdoors. For dwelling units accessed directly from outdoors, the building thermal envelope shall be tested in accordance with ASTM E779, ANSI/RESNET/ICC 380, ASTM E1827 or an equivalent method approved by the code official. The measured air leakage shall not exceed 0.25 cfm/ft2 (1.27 L/s m2) of the testing unit enclosure area at a pressure differential of 0.2 inch water gauge (50 Pa). Where multiple dwelling units or sleeping units or other occupiable conditioned spaces are contained within one building thermal envelope and are accessed directly from the outdoors, each unit shall be considered an individual testing unit, and the building air leakage shall be the weighted average of all testing unit results, weighted by each testing unit's enclosure area. Units shall be tested separately with an unguarded blower door test as follows:

1. Where buildings have fewer than eight testing units, each testing unit shall be tested.

2. For buildings with eight or more testing units, the greater of seven units or 20 percent of the testing units in the building shall be tested, including a top floor unit, a ground floor unit and a unit with the largest testing unit enclosure area. For each tested unit that exceeds the maximum air leakage rate, an additional two units shall be tested, including a mixture of testing unit types and locations.

3. Test shall be accomplished using either a) both pressurization and depressurization or b) pressurization alone, but not depressurization alone. The test results shall be plotted against the correct P for pressurization in accordance with Section 9.4 of ASTM E779.

Where the measured air leakage rate exceeds 0.25 cfm/ft2 (2.0 L/s x m2) corrective action shall be taken to seal leaks in the air barrier in all units exceeding the target value and all untested units. Post-corrective action testing and repeated corrective action measures will be taken until the required air leakage rating is achieved. Final passing air leakage test results shall be submitted to the code official.

C402.5.3 Building thermal envelope testing. The building thermal envelope shall be tested in accordance with ASTM E779, ANSI/RESNET/ICC 380, ASTM E3158 or ASTM E1827 or an equivalent method approved by the code official. The measured air leakage shall not exceed 0.25 cfm/ft2 (1.27 L/s × m2) of the building thermal envelope area at a pressure differential of 0.3 inch water gauge (75 Pa). Alternatively, portions of the building shall be tested and the measured air leakages shall be area weighted by the surface areas of the building envelope in each portion. The weighted average test results shall not exceed the whole building leakage limit. In the alternative approach, the following portions of the building shall be tested:

1. The entire envelope area of all stories that have any spaces directly under a roof.

2. The entire envelope area of all stories that have a building entrance, exposed floor, or loading dock, or are below grade.

3. Representative above-grade sections of the building totaling at least 25 percent of the wall area enclosing the remaining conditioned space.

4. Test shall be accomplished using either a) both pressurization and depressurization or b) pressurization alone, but not depressurization alone. The test results shall be plotted against the correct P for pressurization in accordance with Section 9.4 of ASTM E779.

Where the measured air leakage rate exceeds 0.25 cfm/ft2 (2.0 L/s x m2) corrective action shall be taken to seal leaks in the air barrier. Post-corrective action testing and repeated corrective action measures will be taken until the required air leakage rating is achieved. Final passing of the air leakage test results shall be submitted to the code official.

C402.5.4 Building test for mixed-use buildings. Where a building is three or fewer stories above grade plane and contains both commercial and residential uses, the air barrier of the R-2 and R-3 occupancy areas of the building is permitted to be separately tested according to Section R402.4.1.2. Alternatively, it is permissible to test the air barrier of the entire building according to Section C402.5.3, provided that the tested air leakage rate does not exceed the rate specified in Section C402.5.3.

History

• Statutory Authority: RCW 19.27A.045 and chapter 19.27A RCW. WSR 24-16-145, § 51-11C-40241, filed 8/7/24, effective 9/7/24. Statutory Authority: RCW 19.27A.020, 19.27A.025, 19.27A.160 and chapters 19.27A and 19.27 RCW. WSR 22-14-091, 23-12-101, and 23-20-021, § 51-11C-40241, filed 7/1/22, 6/7/23, and 9/25/23, effective 3/15/24. Statutory Authority: RCW 19.27A.020, 19.27A.025, 19.27A.160 and chapter 19.27 RCW. WSR 19-24-040, § 51-11C-40241, filed 11/26/19, effective 7/1/20. Statutory Authority: RCW 19.27A.025, 19.27A.160, and 19.27.074. WSR 16-03-072, § 51-11C-40241, filed 1/19/16, effective 7/1/16. Statutory Authority: RCW 19.27A.020, 19.27A.025 and chapters 19.27 and 34.05 RCW. WSR 13-04-056, § 51-11C-40241, filed 2/1/13, effective 7/1/13.

Wash. Admin. Code § 51-11C-40243 Section C402.5.5—Rooms containing fuel-burning appliances.

C402.5.5 Rooms containing fuel-burning appliances. Where combustion air is supplied through openings in an exterior wall to a room or space containing a space conditioning fuel-burning appliance, one of the following shall apply:

1. The room or space containing the appliance shall be located outside of the building thermal envelope.

2. The room or space containing the appliance shall be enclosed and isolated from conditioned spaces inside the building thermal envelope. Such rooms shall comply with all of the following:

2.1. The walls, floor and ceiling that separate the enclosed room or space from the conditioned spaces shall be insulated to be at least equivalent to the insulation requirement of below grade walls as specified in Table C402.1.3 or C402.1.4.

2.2. The walls, floors and ceilings that separate the enclosed room or space from conditioned spaces be sealed in accordance with Section C402.5.1.1.

2.3. The doors into the enclosed room or space shall be fully gasketed.

2.4. Water lines and ducts in the enclosed room or space shall be insulated in accordance with Section C403.

2.5. Where the air duct supplying combustion air to the enclosed room or space passes through conditioned space, the duct shall be insulated to an R-value of not less than R-16.

| EXCEPTION: | Fireplaces and stoves complying with Sections 901 through 905 of the International Mechanical Code, and Section 2111.14 of the International Building Code. | | --- | --- |

History

• Statutory Authority: RCW 19.27A.045 and chapter 19.27A RCW. WSR 24-16-145, § 51-11C-40243, filed 8/7/24, effective 9/7/24. Statutory Authority: RCW 19.27A.020, 19.27A.025, 19.27A.160 and chapters 19.27A and 19.27 RCW. WSR 22-14-091, 23-12-101, and 23-20-021, § 51-11C-40243, filed 7/1/22, 6/7/23, and 9/25/23, effective 3/15/24. Statutory Authority: RCW 19.27A.020, 19.27A.025, 19.27A.160 and chapter 19.27 RCW. WSR 19-24-040, § 51-11C-40243, filed 11/26/19, effective 7/1/20. Statutory Authority: RCW 19.27A.025, 19.27A.160, and 19.27.074. WSR 16-03-072, § 51-11C-40243, filed 1/19/16, effective 7/1/16. Statutory Authority: RCW 19.27A.020, 19.27A.025 and chapters 19.27 and 34.05 RCW. WSR 13-04-056, § 51-11C-40243, filed 2/1/13, effective 7/1/13.

Wash. Admin. Code § 51-11C-40244 Section C402.5.6—Doors and access openings.

C402.5.6 Doors and access openings to shafts, chutes, stairways, and elevator lobbies. Doors and access openings from conditioned space to shafts, chutes, stairways and elevator lobbies shall be gasketed, weatherstripped or sealed.

| EXCEPTIONS: | 1. Door openings required to comply with Section 716 of the International Building Code. | | --- | --- | | | 2. Doors and door openings required to comply with UL 1784 by the International Building Code. |

History

• Statutory Authority: RCW 19.27A.020, 19.27A.025, 19.27A.160 and chapters 19.27A and 19.27 RCW. WSR 22-14-091, 23-12-101, and 23-20-021, § 51-11C-40244, filed 7/1/22, 6/7/23, and 9/25/23, effective 3/15/24. Statutory Authority: RCW 19.27A.020, 19.27A.025, 19.27A.160 and chapter 19.27 RCW. WSR 19-24-040, § 51-11C-40244, filed 11/26/19, effective 7/1/20. Statutory Authority: RCW 19.27A.025, 19.27A.160, and 19.27.074. WSR 16-03-072, § 51-11C-40244, filed 1/19/16, effective 7/1/16. Statutory Authority: RCW 19.27A.020, 19.27A.025 and chapters 19.27 and 34.05 RCW. WSR 13-04-056, § 51-11C-40244, filed 2/1/13, effective 7/1/13.

Wash. Admin. Code § 51-11C-40245 Section C402.5.7—Air intakes, exhaust openings, stairways and shafts.

C402.5.7 Air intakes, exhaust openings, stairways and shafts. Stairway enclosures, elevator shaft vents and other outdoor air intakes and exhaust openings integral to the building envelope shall be provided with dampers in accordance with Section C403.7.8.

History

• Statutory Authority: RCW 19.27A.020, 19.27A.025, 19.27A.160 and chapters 19.27A and 19.27 RCW. WSR 22-14-091, 23-12-101, and 23-20-021, § 51-11C-40245, filed 7/1/22, 6/7/23, and 9/25/23, effective 3/15/24. Statutory Authority: RCW 19.27A.020, 19.27A.025, 19.27A.160 and chapter 19.27 RCW. WSR 19-24-040, § 51-11C-40245, filed 11/26/19, effective 7/1/20. Statutory Authority: RCW 19.27A.025, 19.27A.160, and 19.27.074. WSR 16-03-072, § 51-11C-40245, filed 1/19/16, effective 7/1/16. Statutory Authority: RCW 19.27A.025, 19.27A.045, 19.27.020, and 19.27.074. WSR 14-24-054, § 51-11C-40245, filed 11/25/14, effective 5/1/15. Statutory Authority: RCW 19.27A.020, 19.27A.025 and chapters 19.27 and 34.05 RCW. WSR 13-04-056, § 51-11C-40245, filed 2/1/13, effective 7/1/13.

Wash. Admin. Code § 51-11C-40246 Section C402.5.8—Loading dock weatherseals.

C402.5.8 Loading dock weatherseals. Cargo door openings and loading dock door openings shall be equipped with weatherseals that restrict infiltration and provide direct contact along the top and sides of vehicles that are parked in the doorway.

History

• Statutory Authority: RCW 19.27A.020, 19.27A.025, 19.27A.160 and chapters 19.27A and 19.27 RCW. WSR 22-14-091, 23-12-101, and 23-20-021, § 51-11C-40246, filed 7/1/22, 6/7/23, and 9/25/23, effective 3/15/24. Statutory Authority: RCW 19.27A.020, 19.27A.025, 19.27A.160 and chapter 19.27 RCW. WSR 19-24-040, § 51-11C-40246, filed 11/26/19, effective 7/1/20. Statutory Authority: RCW 19.27A.025, 19.27A.160, and 19.27.074. WSR 16-03-072, § 51-11C-40246, filed 1/19/16, effective 7/1/16. Statutory Authority: RCW 19.27A.020, 19.27A.025 and chapters 19.27 and 34.05 RCW. WSR 13-04-056, § 51-11C-40246, filed 2/1/13, effective 7/1/13.

Wash. Admin. Code § 51-11C-40247 Section C402.5.9—Vestibules.

C402.5.9 Vestibules. All building entrances shall be protected with an enclosed vestibule, with all doors opening into and out of the vestibule equipped with self-closing devices. Vestibules shall be designed so that in passing through the vestibule it is not necessary for the interior and exterior doors to open at the same time. The installation of one or more revolving doors in the building entrance shall not eliminate the requirement that a vestibule be provided on any doors adjacent to revolving doors. For the purposes of this section, "building entrances" shall include exit-only doors in buildings where separate doors for entering and exiting are provided.

Interior and exterior doors shall have a minimum distance between them of not less than 7 feet. The exterior envelope of conditioned vestibules shall comply with the requirements for a conditioned space. Either the interior or exterior envelope of unconditioned vestibules shall comply with the requirements for a conditioned space. The building lobby is not considered a vestibule.

| EXCEPTION: | Vestibules are not required for the following: | | --- | --- | | | 1. Doors not intended to be used as building entrances. | | | 2. Unfinished ground-level space greater than 3,000 square feet (298 m2) if a note is included on the permit documents at each exterior entrance to the space stating "Vestibule required at time of tenant build-out if entrance serves a space greater than 3,000 square feet in area." | | | 3. Doors opening directly from a sleeping unit or dwelling unit. | | | 4. Doors between an enclosed space smaller than 3,000 square feet (298 m2) in area and the exterior of the building or the building entrance lobby, where those doors do not comprise one of the primary building entrance paths to the remainder of the building. The space must be enclosed and separated without transfer air paths from the primary building entrance paths. If there are doors between the space and the primary entrance path, then the doors shall be equipped with self-closing devices so the space acts as a vestibule for the primary building entrance. | | | 5. Revolving doors. | | | 6. Doors used primarily to facilitate vehicular movement or material handling and adjacent personnel doors. | | | 7. In buildings less than 3 stories above grade or in spaces that do not directly connect with the building elevator lobby, doors that have an air curtain with a velocity of not less than 6.56 feet per second (2 m/s) at the floor that have been tested in accordance with ANSI/AMCA 220 and installed in accordance with the manufacturer's instructions. Manual or automatic controls shall be provided that will operate the air curtain with the opening and closing of the door. Air curtains and their controls shall comply with Section C408.2.3. | | | 8. Building entrances in buildings that are less than four stories above grade and less than 10,000 ft2 in area. | | | 9. Elevator doors in parking garages provided that the elevators have an enclosed lobby at each level of the garage. | | | 10. Entrances to semi-heated spaces. | | | 11. Doors that are used only to access outdoor seating areas that are separated from adjacent walking areas by a fence or other barrier. |

History

• Statutory Authority: RCW 19.27A.020, 19.27A.025, 19.27A.160 and chapters 19.27A and 19.27 RCW. WSR 22-14-091, 23-12-101, and 23-20-021, § 51-11C-40247, filed 7/1/22, 6/7/23, and 9/25/23, effective 3/15/24. Statutory Authority: RCW 19.27A.020, 19.27A.025, 19.27A.160 and chapter 19.27 RCW. WSR 19-24-040, § 51-11C-40247, filed 11/26/19, effective 7/1/20. Statutory Authority: RCW 19.27A.025, 19.27A.160, and 19.27.074. WSR 16-03-072, § 51-11C-40247, filed 1/19/16, effective 7/1/16. Statutory Authority: RCW 19.27A.020, 19.27A.025 and chapters 19.27 and 34.05 RCW. WSR 13-04-056, § 51-11C-40247, filed 2/1/13, effective 7/1/13.

Wash. Admin. Code § 51-11C-40248 Section C402.5.10—Recessed lighting.

C402.5.10 Recessed lighting. Recessed luminaires installed in the building thermal envelope shall be all of the following:

1. IC rated.

2. Labeled as having an air leakage rate of not more than 2.0 cfm (0.944 L/s) when tested in accordance with ASTM E 283 at a 1.57 psf (75 Pa) pressure differential.

3. Sealed with a gasket or caulk between the housing and interior wall or ceiling covering.

C402.5.11 Operable openings interlocking. Where any operable openings to the outdoors are larger than 48 square feet (4.47 m2) in area, such openings shall be interlocked with the heating and cooling system as required by Section C403.4.1.6.

| EXCEPTIONS: | 1. Separately zoned areas associated with the preparation of food that contain appliances that contribute to the HVAC loads of a restaurant or similar type of occupancy. | | --- | --- | | | 2. Warehouses that utilize overhead doors for the function of the occupancy, where approved by the code official. | | | 3. The outer entrance doors where located in the exterior wall and are part of a vestibule system. | | | 4. Alterations to existing buildings. |

History

• Statutory Authority: RCW 19.27A.020, 19.27A.025, 19.27A.160 and chapters 19.27A and 19.27 RCW. WSR 22-14-091, 23-12-101, and 23-20-021, § 51-11C-40248, filed 7/1/22, 6/7/23, and 9/25/23, effective 3/15/24. Statutory Authority: RCW 19.27A.025, 19.27A.160, and 19.27.074. WSR 16-03-072, § 51-11C-40248, filed 1/19/16, effective 7/1/16. Statutory Authority: RCW 19.27A.020, 19.27A.025 and chapters 19.27 and 34.05 RCW. WSR 13-04-056, § 51-11C-40248, filed 2/1/13, effective 7/1/13.

Wash. Admin. Code § 51-11C-40250 Reserved.

History

• Statutory Authority: RCW 19.27A.025, 19.27A.160, and 19.27.074. WSR 16-03-072, § 51-11C-40250, filed 1/19/16, effective 7/1/16. Statutory Authority: RCW 19.27A.020, 19.27A.025 and chapters 19.27 and 34.05 RCW. WSR 13-04-056, § 51-11C-40250, filed 2/1/13, effective 7/1/13.

Wash. Admin. Code § 51-11C-40260 Reserved.

History

• Statutory Authority: RCW 19.27A.025, 19.27A.160, and 19.27.074. WSR 16-03-072, § 51-11C-40260, filed 1/19/16, effective 7/1/16. Statutory Authority: RCW 19.27A.020, 19.27A.025 and chapters 19.27 and 34.05 RCW. WSR 13-04-056, § 51-11C-40260, filed 2/1/13, effective 7/1/13.

Wash. Admin. Code § 51-11C-40300 Section C403—Mechanical systems.

History

• Statutory Authority: RCW 19.27A.020, 19.27A.025 and chapters 19.27 and 34.05 RCW. WSR 13-04-056, § 51-11C-40300, filed 2/1/13, effective 7/1/13.

Wash. Admin. Code § 51-11C-40310 Section C403.1—General.

C403.1 General. Mechanical systems and equipment serving heating, cooling, ventilating, and other needs shall comply with this section.

| EXCEPTIONS: | 1. Energy using equipment used by a manufacturing, industrial or commercial process other than for conditioning spaces or maintaining comfort and amenities for the occupants are exempt from all Section C403 subsections except for Section C403.3.2, Tables C403.3.2 (1) through (16) inclusive, Sections C403.3.4.1, C403.3.4.2, C403.3.4.3, C403.7.7, C403.9.2.1, C403.10.3, C403.11.2, and C403.11.3, as applicable. Data center and computer room HVAC equipment is not covered by this exception. | | --- | --- | | | 2. Data center systems are exempt from Sections C403.4 and C403.5. |

C403.1.1 HVAC total system performance ratio (HVAC TSPR). For systems serving office (including medical office), retail, library, and education occupancies and buildings, which are subject to the requirements of Section C403.3.5 without exceptions, and the dwelling units and residential common areas within Group R-2 multi-family buildings, the HVAC total system performance ratio (HVAC TSPR) of the proposed design HVAC system shall be greater than or equal to the HVAC TSPR of the standard reference design as calculated according to Appendix D, Calculation of HVAC Total System Performance Ratio.

| EXCEPTIONS: | 1. Buildings where the sum of the conditioned floor area of office, retail, education, library and multifamily spaces is less than 5,000 square feet. Areas that are eligible for any of the exceptions below do not count towards the 5,000 square feet. | | --- | --- | | | 2. HVAC systems using district heating water, chilled water or steam. | | | 3. HVAC systems connected to a low-carbon district energy exchange system. | | | 4. HVAC systems not included in Table D601.10.1. | | | 5. HVAC systems with chilled water supplied by absorption chillers, heat recovery chillers, water to water heat pumps, air to water heat pumps, or a combination of air and water cooled chillers on the same chilled water loop. | | | 6. HVAC systems included in Table D601.10.1 with parameters in Table D601.10.2 not identified as applicable to that HVAC system type. | | | 7. HVAC systems served by heating water plants that include air to water or water to water heat pumps. | | | 8. Underfloor air distribution and displacement ventilation HVAC systems. | | | 9. Space conditioning systems that do not include mechanical cooling. | | | 10. Alterations to existing buildings that do not substantially replace the entire HVAC system and are not serving initial build-out construction. | | | 11. HVAC systems meeting all the requirements of the standard reference design HVAC system in Table D602.11, Standard Reference Design HVAC Systems. | | | 12. Buildings or areas of medical office buildings that comply fully with ASHRAE Standard 170 including, but not limited to, surgical centers, or that are required by other applicable codes or standards to provide 24/7 air handling unit operation. | | | 13. HVAC systems serving the following areas and spaces: | | | 13.1. Laundry rooms. | | | 13.2. Elevator machine rooms. | | | 13.3. Mechanical and electrical rooms. | | | 13.4. Data centers and computer rooms. | | | 13.5. Laboratories with fume hoods. | | | 13.6. Locker rooms with more than two showers. | | | 13.7. Natatoriums and rooms with saunas. | | | 13.8. Restaurants and commercial kitchens with total cooking capacity greater than 100,000 Btu/h. | | | 13.9. Areas of buildings with commercial refrigeration equipment exceeding 100 kW of power input. | | | 13.10. Cafeterias and dining rooms. |

C403.1.2 Calculation of heating and cooling loads. Design loads associated with heating, ventilating and air conditioning of the building shall be determined in accordance with the procedures described in ANSI/ASHRAE/ACCA Standard 183 or by an approved equivalent computational procedure, using the design parameters specified in Chapter 3. Heating and cooling loads shall be adjusted to account for load reductions that are achieved where energy recovery systems are utilized in the HVAC system in accordance with the ASHRAE HVAC Systems and Equipment Handbook by an approved equivalent computational procedure.

C403.1.3 Data centers.Data center systems shall comply with Sections 6 and 8 of ASHRAE Standard 90.4.

History

• Statutory Authority: RCW 19.27A.020, 19.27A.025, 19.27A.160 and chapters 19.27A and 19.27 RCW. WSR 22-14-091, 23-12-101, and 23-20-021, § 51-11C-40310, filed 7/1/22, 6/7/23, and 9/25/23, effective 3/15/24. Statutory Authority: RCW 19.27A.025, 19.27A.045 and chapter 19.27 RCW. WSR 20-21-080, § 51-11C-40310, filed 10/19/20, effective 2/1/21. Statutory Authority: RCW 19.27A.020, 19.27A.025, 19.27A.160 and chapter 19.27 RCW. WSR 19-24-040, § 51-11C-40310, filed 11/26/19, effective 7/1/20. Statutory Authority: RCW 19.27A.025, 19.27A.160, and 19.27.074. WSR 16-03-072, § 51-11C-40310, filed 1/19/16, effective 7/1/16. Statutory Authority: RCW 19.27A.020, 19.27A.025 and chapters 19.27 and 34.05 RCW. WSR 13-04-056, § 51-11C-40310, filed 2/1/13, effective 7/1/13.

Wash. Admin. Code § 51-11C-40314 Section C403.1.4—HVAC heating equipment.

C403.1.4 Use of electric resistance and fossil fuel-fired HVAC heating equipment. HVAC heating energy shall not be provided by electric resistance or fossil fuel combustion appliances. For the purposes of this section, electric resistance HVAC heating appliances include, but are not limited to, electric baseboard, electric resistance fan coil and VAV electric resistance terminal reheat units and electric resistance boilers. For the purposes of this section, fossil fuel combustion HVAC heating appliances include, but are not limited to, appliances burning natural gas, heating oil, propane, or other fossil fuels.

| EXCEPTIONS: | 1. Low heating capacity. Buildings or areas of buildings, other than dwelling units or sleeping units, that meet the interior temperature requirements of Chapter 12 of the International Building Code with a total installed HVAC heating capacity no greater than 8.5 Btu/h (2.5 watts) per square foot of conditioned space are permitted to be heated using electric resistance appliances. | | | --- | --- | --- | | | 2. Dwelling and sleeping units. Dwelling or sleeping units are permitted to be heated using electric resistance appliances as long as the installed HVAC heating capacity in any separate space is not greater than: | | | | 2.1. Seven hundred fifty (750) watts in Climate Zone 4, and 1000 watts in Climate Zone 5 in each habitable space with fenestration. | | | | 2.2. One thousand (1,000) watts in Climate Zone 4, and 1300 watts in Climate Zone 5 for each habitable space that has two primary walls facing different cardinal directions, each with exterior fenestration. Bay windows and other minor offsets are not considered primary walls. | | | | 2.3. Two hundred fifty (250) watts in spaces adjoining the building thermal envelope but without fenestration. | | | | For the purposes of this section, habitable space is as defined in the International Building Code. For buildings in locations with exterior design conditions below 4°F (-16°C), an additional 250 watts above that allowed for Climate Zone 5 is permitted in each space with fenestration. | | | | 3. Small buildings. Buildings with less than 2,500 square feet (232 m2) of conditioned floor area are permitted to be heated using electric resistance appliances. | | | | 4. Defrost. Heat pumps are permitted to utilize electric resistance heating when a heat pump defrost cycle is required and is in operation. | | | | 5. Air-to-air heat pumps. Buildings are permitted to utilize supplemental heating for air-to-air heat pumps that meet all of the following conditions: | | | | 5.1. Internal electric resistance heaters have controls that prevent supplemental heater operation when the heating load can be met by the heat pump alone during both steady-state operation and setback recovery. | | | | 5.2. The heat pump controls are configured to use the compressor as the first stage of heating down to an outdoor air temperature of 17°F (-8°C) or lower except when in defrost. | | | | EXCEPTIONS TO 5.2: | | | | | 1. Packaged terminal heat pumps (PTHPs) that comply with the minimum heating efficiency requirements in Table C403.3.2(4) are exempt from heating pump controls capable of operating the compressor as the first stage of heating down to an outdoor air temperature of 17°F (-8°C) or lower. | | | | 2. Heat pumps whose minimum efficiency is regulated by NAECA and whose ratings meet the requirements shown in Table C403.3.2(2) and include all usage of internal electric resistance heating are exempt from heat pump controls capable of operating the compressor as the first state of heating down to an outdoor air temperature of 17°F (-8°C) or lower. | | | 5.3. The heat pump complies with one of the following: | | | | 5.3.1. Controlled by a digital or electronic thermostat designed for heat pump use that energizes the supplemental heat only when the heat pump has insufficient capacity to maintain set point or to warm up the space at a sufficient rate. | | | | 5.3.2. Controlled by a multistage space thermostat and an outdoor air thermostat wired to energize supplemental heat only on the last stage of the space thermostat and when outdoor air temperature is less than 32°F (0°C) except when in defrost. | | | | 5.3.3. The minimum efficiency of the heat pump is regulated by NAECA, its rating meets the requirements shown in Table C403.3.2(2), and its rating includes all usage of internal electric resistance heating. | | | | 5.4. The heat pump rated heating capacity is sized to meet the heating load at an outdoor air temperature of 32°F (0°C) or lower and has a rated heating capacity at 47°F (8°C) no less than 2 times greater than supplemental heating capacity in Climate Zone 4 and no less than the supplemental heating capacity in Climate Zone 5, or utilizes the smallest available factory-available internal electric resistance heater. | | | | 6. Air-to-water heat pumps. Buildings are permitted to utilize electric resistance (for Climate Zone 4 or 5) or fossil fuel-fired (for Climate Zone 5) auxiliary heating to supplement heat pump heating for hydronic heating systems that meet all of the following conditions: | | | | 6.1. Controls for the auxiliary heating sources are configured to lock out the supplemental heat when the outside air temperature is above 36°F (2°C), unless the hot water supply temperature setpoint to the building heat coils cannot be maintained for 20 minutes. | | | | 6.2. The heat pump controls are configured to use the compressor as the first stage of heating down to the lowest exterior design temperature for which the equipment is rated except during startup or defrost operation. | | | | 6.3. The heat pump rated heating capacity at 47°F (8°C) is no less than 75 percent of the design heating load at 29°F (-2°C). | | | | 7. Ground source heat pumps. Buildings are permitted to utilize supplemental heating for heat pump heating for hydronic heating systems with ground source heat pump equipment that meets all of the following conditions: | | | | 7.1. Controls for the auxiliary heating sources are configured to lock out the supplemental heat when the equipment source-side entering water temperature is above 42°F (6°C), unless the hot water supply temperature setpoint to the building heat coils cannot be maintained for 20 minutes. | | | | 7.2. The heat pump controls are configured to use the compressor as the first stage of heating. | | | | 7.3. The ground source heat exchanger shall be sized so that the heat pump annual heating output is no less than 70 percent of the total annual heating output in the final year of a 30-year simulation using IGSHPA listed simulation software. | | | | 8. Small systems. Buildings in which electric resistance or fossil fuel appliances, including decorative appliances, either provide less than 5 percent of the total building HVAC system heating capacity or serve less than 5 percent of the conditioned floor area. | | | | 9. Specific conditions. Portions of buildings that require fossil fuel or electric resistance space heating for specific conditions approved by the code official for research, health care, process or other specific needs that cannot practicably be served by heat pump or other space heating systems. This does not constitute a blanket exception for any occupancy type. | | | | 10. Kitchen make-up air. Make-up air for commercial kitchen exhaust systems required to be tempered by Section 508.1.1 of the International Mechanical Code is permitted to be heated by using fossil fuel in Climate Zone 5 or electric resistance in Climate Zone 4 or 5. | | | | 11. District energy. Steam or hot water district energy systems that utilize fossil fuels as their primary source of heat energy, that serve multiple buildings, and that were already in existence prior to the effective date of this code, including more energy-efficient upgrades to such existing systems, are permitted to serve as the primary heating energy source. | | | | 12. Heat tape. Heat tape is permitted where it protects water-filled equipment and piping located outside of the building thermal envelope, provided that it is configured and controlled to be automatically turned off when the outside air temperature is above 40°F (4°C). | | | | 13. Temporary systems. Temporary electric resistance heating systems are permitted where serving future tenant spaces that are unfinished and unoccupied, provided that the heating equipment is sized and controlled to achieve interior space temperatures no higher than 40°F (4°C). | | | | 14. Pasteurization. Electric resistance heat controls are permitted to reset the supply water temperature of hydronic heating systems that serve service water heating heat exchangers during pasteurization cycles of the service hot water storage volume. The hydronic heating system supply water temperature shall be configured to be 145°F (63°C) or lower during the pasteurization cycle. | | | | 15. Freeze protection. Heating systems sized for spaces with indoor design conditions of 45°F (7°C) and intended for freeze protection are permitted to use electric resistance. The building envelope of any such space shall be insulated in compliance with Section C402.1. | | | | 16. DOAS ERV auxiliary heat. Dedicated outdoor air systems with energy recovery ventilation are permitted to utilize fossil fuel for Climate Zone 5 or electric resistance in Climate Zone 4 or 5 for auxiliary heating to preheat outdoor air for defrost or as auxiliary supplemental heat to temper supply air to 55°F (13°C) or lower for buildings or portions of buildings that do not have hydronic heating systems. | | | | 17. Low-carbon district energy systems. Low-carbon district energy systems that meet the definitions of low-carbon district energy exchange system or low-carbon district heating and cooling or heating only systems. | | | | 18. Essential facilities. Groups I-2 and I-3 occupancies that by regulation are required to have in place redundant emergency backup systems. | |

History

• Statutory Authority: RCW 19.27A.020 and 19.27A.025. WSR 24-23-102, s 51-11C-40314, filed 11/20/24, effective 12/21/24. Statutory Authority: RCW 19.27A.020, 19.27A.025, 19.27A.160, chapters 19.27A and 19.27 RCW. WSR 24-03-085, § 51-11C-40314, filed 1/16/24, effective 3/15/24
• WSR 22-14-091, 23-12-101, and 23-20-021, § 51-11C-40314, filed 7/1/22, 6/7/23, and 9/25/23, effective 3/15/24.

Wash. Admin. Code § 51-11C-40320 Section C403.2—System design.

C403.2 System design. Mechanical systems shall be designed to comply with Sections C403.2.1 through C403.2.4. Where elements of a building's mechanical systems are addressed in Sections C403.3 through C403.13, such elements shall comply with the applicable provisions of those sections.

History

• Statutory Authority: RCW 19.27A.045 and chapter 19.27A RCW. WSR 24-16-145, § 51-11C-40320, filed 8/7/24, effective 9/7/24. Statutory Authority: RCW 19.27A.020, 19.27A.025, 19.27A.160 and chapters 19.27A and 19.27 RCW. WSR 22-14-091, 23-12-101, and 23-20-021, § 51-11C-40320, filed 7/1/22, 6/7/23, and 9/25/23, effective 3/15/24. Statutory Authority: RCW 19.27A.020, 19.27A.025, 19.27A.160 and chapter 19.27 RCW. WSR 19-24-040, § 51-11C-40320, filed 11/26/19, effective 7/1/20. Statutory Authority: RCW 19.27A.025, 19.27A.160, and 19.27.074. WSR 16-03-072, § 51-11C-40320, filed 1/19/16, effective 7/1/16. Statutory Authority: RCW 19.27A.020, 19.27A.025 and chapters 19.27 and 34.05 RCW. WSR 13-04-056, § 51-11C-40320, filed 2/1/13, effective 7/1/13.

Wash. Admin. Code § 51-11C-40321 Section C403.2.1—Zone isolation.

C403.2.1Zone isolation required. HVAC systems, DOAS and exhaust systems serving areas that are intended to operate or be occupied nonsimultaneously shall be divided into separate isolation areas. Zones intended to be occupied simultaneously may be grouped into a single isolation area provided the combined total area does not exceed 25,000 square feet (2323 m2) of conditioned floor area and does not include more than one floor. Each isolation area shall be equipped with isolation devices and controls configured to automatically shut off the supply of conditioned air and outdoor air to and exhaust air from the isolation area. Each isolation area shall be controlled independently by a device meeting the requirements of Section C403.4.2.2. Central systems and plants shall be provided with controls and devices that will allow system and equipment operation for any length of time while serving only the smallest isolation area served by the system or plant.

| EXCEPTIONS: | 1. Exhaust air and outdoor air connections to isolation areas where the fan system to which they connect is not greater than 5,000 cfm (2360 L/s). | | --- | --- | | | 2. Exhaust airflow from a single isolation area of less than 10 percent of the design airflow of the exhaust system to which it connects. | | | 3. Isolation areas intended to operate continuously or intended to be inoperative only when all other isolation areas in a zone are inoperative. |

History

• Statutory Authority: RCW 19.27A.020, 19.27A.025, 19.27A.160 and chapters 19.27A and 19.27 RCW. WSR 22-14-091, 23-12-101, and 23-20-021, § 51-11C-40321, filed 7/1/22, 6/7/23, and 9/25/23, effective 3/15/24. Statutory Authority: RCW 19.27A.020, 19.27A.025, 19.27A.160 and chapter 19.27 RCW. WSR 19-24-040, § 51-11C-40321, filed 11/26/19, effective 7/1/20. Statutory Authority: RCW 19.27A.025, 19.27A.160, and 19.27.074. WSR 16-03-072, § 51-11C-40321, filed 1/19/16, effective 7/1/16. Statutory Authority: RCW 19.27A.020, 19.27A.025 and chapters 19.27 and 34.05 RCW. WSR 13-04-056, § 51-11C-40321, filed 2/1/13, effective 7/1/13.

Wash. Admin. Code § 51-11C-40322 Section C403.2.2—Ventilation and exhaust.

C403.2.2 Ventilation and exhaust.

C403.2.2.1 Ventilation. Ventilation, either natural or mechanical, shall be provided in accordance with Chapter 4 of the International Mechanical Code. Where mechanical ventilation is provided, the system shall be configured to provide no greater than 150 percent of the minimum outdoor air required by Chapter 4 of the International Mechanical Code or other applicable code or standard, whichever is greater.

| EXCEPTIONS: | 1. The mechanical system may supply outdoor air at rates higher than the limit above when it is used for particulate or VOC dilution, economizing or night flushing, dehumidification, pressurization, exhaust make-up, or other process air delivery. Outdoor air shall be reduced to the minimum ventilation rates when not required for the preceding uses. | | --- | --- | | | 2. Air systems supplying dwelling or sleeping units within Group R-1, R-2 or I-2 occupancies. | | | 3. Alterations that replace less than half of the total heating and cooling capacity of the system. | | | 4. Systems with energy recovery complying with the requirements of Section C403.7.6.1 that utilize sensible only active chilled beams for space cooling without any additional zonal fan power. Active chilled beams shall be permitted to utilize the increased outdoor airflow to increase space sensible capacity and to maintain space latent cooling loads without additional controls to reduce the outdoor airflow to each zone. | | | 5. Systems that include energy recovery ventilation with an 80 percent minimum sensible recovery effectiveness in accordance with Section C403.3.5.1 and with controls capable and configured to lock-out the use of supplemental heat may provide ventilation up to a maximum of 200 percent of the minimum outdoor air required. |

C403.2.2.2 Exhaust. Exhaust shall be provided in accordance with Chapters 4 and 5 of the International Mechanical Code. Where exhaust is provided, the system shall be configured to provide no greater than 150 percent of the minimum exhaust air required by Chapters 4 and 5 of the International Mechanical Code or other applicable code or standard, whichever is greater.

| EXCEPTIONS: | 1. The mechanical system may exhaust air at rates higher than the limit above when it is used for particulate or VOC dilution, economizer, night flushing, dehumidification, pressure equalization, relief, or other process exhaust air requirements. Outdoor air and exhaust air shall be reduced to the minimum ventilation rates when not required for the preceding uses. | | --- | --- | | | 2. Domestic range hood exhaust in Group R occupancies. | | | 3. Exhaust from Group I occupancies. |

History

• Statutory Authority: RCW 19.27A.020, 19.27A.025, 19.27A.160 and chapters 19.27A and 19.27 RCW. WSR 22-14-091, 23-12-101, and 23-20-021, § 51-11C-40322, filed 7/1/22, 6/7/23, and 9/25/23, effective 3/15/24. Statutory Authority: RCW 19.27A.020, 19.27A.025, 19.27A.160 and chapter 19.27 RCW. WSR 19-24-040, § 51-11C-40322, filed 11/26/19, effective 7/1/20. Statutory Authority: RCW 19.27A.025, 19.27A.160, and 19.27.074. WSR 16-03-072, § 51-11C-40322, filed 1/19/16, effective 7/1/16. Statutory Authority: RCW 19.27A.020, 19.27A.025 and chapters 19.27 and 34.05 RCW. WSR 13-04-056, § 51-11C-40322, filed 2/1/13, effective 7/1/13.

Wash. Admin. Code § 51-11C-40323 Section C403.2.3—Fault detection and diagnostics.

C403.2.3 Fault detection and diagnostics. New buildings with an HVAC system serving a gross conditioned floor area of 100,000 square feet (9290 m2) or larger shall include a fault detection and diagnostics (FDD) system to monitor the HVAC system's performance and automatically identify faults. The FDD system shall:

1. Include permanently installed sensors and devices to monitor the HVAC system's performance.

2. Sample the HVAC system's performance at least once every 15 minutes.

3. Automatically identify and report HVAC system faults.

4. Automatically notify authorized personnel of identified HVAC system faults.

5. Automatically provide prioritized recommendations for repair of identified faults based on analysis of data collected from the sampling of HVAC system performance.

6. Be capable of transmitting the prioritized fault repair recommendations to remotely located authorized personnel.

| EXCEPTION: | Group R-1 and R-2 occupancies. | | --- | --- |

History

• Statutory Authority: RCW 19.27A.020, 19.27A.025, 19.27A.160 and chapters 19.27A and 19.27 RCW. WSR 22-14-091, 23-12-101, and 23-20-021, § 51-11C-40323, filed 7/1/22, 6/7/23, and 9/25/23, effective 3/15/24. Statutory Authority: RCW 19.27A.020, 19.27A.025, 19.27A.160 and chapter 19.27 RCW. WSR 19-24-040, § 51-11C-40323, filed 11/26/19, effective 7/1/20. Statutory Authority: RCW 19.27A.025, 19.27A.160, and 19.27.074. WSR 16-03-072, § 51-11C-40323, filed 1/19/16, effective 7/1/16. Statutory Authority: RCW 19.27A.020, 19.27A.025 and chapters 19.27 and 34.05 RCW. WSR 13-04-056, § 51-11C-40323, filed 2/1/13, effective 7/1/13.

Wash. Admin. Code § 51-11C-40324 Section C403.2.4—Variable flow capacity.

C403.2.4 Variable flow capacity. For fan and pump motors 5.0 hp and greater including motors in or serving custom and packaged air handlers serving variable air volume fan systems, constant volume fans, heating and cooling hydronic pumping systems, pool and service water pumping systems, domestic water pressure-booster systems, cooling tower fan, and other pump or fan motors where variable flows are required, there shall be:

1. Variable speed drives; or

2. Other controls and devices that will result in fan and pump motor demand of no more than 30 percent of design wattage at 50 percent of design air volume for fans when static pressure set point equals 1/3 the total design static pressure, and 50 percent of design water flow for pumps, based on manufacturer's certified test data. Variable inlet vanes, throttling valves (dampers), scroll dampers or bypass circuits shall not be allowed.

| EXCEPTION: | Variable speed devices are not required for motors that serve: | | --- | --- | | | 1. Fans or pumps in packaged equipment where variable speed drives are not available as a factory option from the equipment manufacturer. | | | 2. Fans or pumps that are required to operate only for emergency fire-life-safety events (e.g., stairwell pressurization fans, elevator pressurization fans, fire pumps, etc.). |

History

• Statutory Authority: RCW 19.27A.020, 19.27A.025, 19.27A.160 and chapters 19.27A and 19.27 RCW. WSR 22-14-091, 23-12-101, and 23-20-021, § 51-11C-40324, filed 7/1/22, 6/7/23, and 9/25/23, effective 3/15/24. Statutory Authority: RCW 19.27A.020, 19.27A.025, 19.27A.160 and chapter 19.27 RCW. WSR 19-24-040, § 51-11C-40324, filed 11/26/19, effective 7/1/20. Statutory Authority: RCW 19.27A.025, 19.27A.160, and 19.27.074. WSR 16-03-072, § 51-11C-40324, filed 1/19/16, effective 7/1/16. Statutory Authority: RCW 19.27A.020, 19.27A.025 and chapters 19.27 and 34.05 RCW. WSR 13-04-056, § 51-11C-40324, filed 2/1/13, effective 7/1/13.

Wash. Admin. Code § 51-11C-40325 Reserved.

History

• Statutory Authority: RCW 19.27A.020, 19.27A.025, 19.27A.160 and chapter 19.27 RCW. WSR 19-24-040, § 51-11C-40325, filed 11/26/19, effective 7/1/20. Statutory Authority: RCW 19.27A.025, 19.27A.160, and 19.27.074. WSR 16-03-072, § 51-11C-40325, filed 1/19/16, effective 7/1/16. Statutory Authority: RCW 19.27A.020, 19.27A.025 and chapters 19.27 and 34.05 RCW. WSR 13-04-056, § 51-11C-40325, filed 2/1/13, effective 7/1/13.

Wash. Admin. Code § 51-11C-40326 Reserved.

History

• Statutory Authority: RCW 19.27A.020, 19.27A.025, 19.27A.160 and chapter 19.27 RCW. WSR 19-24-040, § 51-11C-40326, filed 11/26/19, effective 7/1/20. Statutory Authority: RCW 19.27A.025, 19.27A.160, and 19.27.074. WSR 16-03-072, § 51-11C-40326, filed 1/19/16, effective 7/1/16. Statutory Authority: RCW 19.27A.025, 19.27A.045, 19.27.020, and 19.27.074. WSR 14-24-122, § 51-11C-40326, filed 12/3/14, effective 1/3/15. Statutory Authority: RCW 19.27A.020, 19.27A.025 and chapters 19.27 and 34.05 RCW. WSR 13-04-056, § 51-11C-40326, filed 2/1/13, effective 7/1/13.

Wash. Admin. Code § 51-11C-40327 Reserved.

History

• Statutory Authority: RCW 19.27A.020, 19.27A.025, 19.27A.160 and chapter 19.27 RCW. WSR 19-24-040, § 51-11C-40327, filed 11/26/19, effective 7/1/20. Statutory Authority: RCW 19.27A.025, 19.27A.160, and 19.27.074. WSR 16-03-072, § 51-11C-40327, filed 1/19/16, effective 7/1/16. Statutory Authority: RCW 19.27A.020, 19.27A.025 and chapters 19.27 and 34.05 RCW. WSR 13-04-056, § 51-11C-40327, filed 2/1/13, effective 7/1/13.

Wash. Admin. Code § 51-11C-40328 Reserved.

History

• Statutory Authority: RCW 19.27A.020, 19.27A.025, 19.27A.160 and chapter 19.27 RCW. WSR 19-24-040, § 51-11C-40328, filed 11/26/19, effective 7/1/20. Statutory Authority: RCW 19.27A.025, 19.27A.160, and 19.27.074. WSR 16-03-072, § 51-11C-40328, filed 1/19/16, effective 7/1/16. Statutory Authority: RCW 19.27A.020, 19.27A.025 and chapters 19.27 and 34.05 RCW. WSR 13-04-056, § 51-11C-40328, filed 2/1/13, effective 7/1/13.

Wash. Admin. Code § 51-11C-40329 Reserved.

History

• Statutory Authority: RCW 19.27A.020, 19.27A.025, 19.27A.160 and chapter 19.27 RCW. WSR 19-24-040, § 51-11C-40329, filed 11/26/19, effective 7/1/20. Statutory Authority: RCW 19.27A.025, 19.27A.160, and 19.27.074. WSR 16-03-072, § 51-11C-40329, filed 1/19/16, effective 7/1/16. Statutory Authority: RCW 19.27A.020, 19.27A.025 and chapters 19.27 and 34.05 RCW. WSR 13-04-056, § 51-11C-40329, filed 2/1/13, effective 7/1/13.

Wash. Admin. Code § 51-11C-40330 Section C403.3—Equipment selection.

C403.3 Equipment selection. Heating and cooling equipment installed in mechanical systems shall be sized in accordance with Section C403.3.1 and shall not be less efficient in the use of energy than as specified in Section C403.3.2.

History

• Statutory Authority: RCW 19.27A.020, 19.27A.025, 19.27A.160 and chapter 19.27 RCW. WSR 19-24-040, § 51-11C-40330, filed 11/26/19, effective 7/1/20. Statutory Authority: RCW 19.27A.025, 19.27A.045, 19.27A.160, and 19.27.074. WSR 16-13-089, § 51-11C-40330, filed 6/15/16, effective 7/16/16. Statutory Authority: RCW 19.27A.025, 19.27A.160, and 19.27.074. WSR 16-03-072, § 51-11C-40330, filed 1/19/16, effective 7/1/16. Statutory Authority: RCW 19.27A.020, 19.27A.025 and chapters 19.27 and 34.05 RCW. WSR 13-04-056, § 51-11C-40330, filed 2/1/13, effective 7/1/13.

Wash. Admin. Code § 51-11C-40331 Section C403.3.1—Equipment and system sizing.

C403.3.1 Equipment and system sizing. The output capacity of heating and cooling equipment shall be not greater than that of the smallest available equipment size that exceeds the loads calculated in accordance with Section C403.1.2. A single piece of equipment providing both heating and cooling shall satisfy this provision for one function with the capacity for the other function as small as possible, within available equipment options.

| EXCEPTIONS: | 1. Required standby equipment and systems provided with controls and devices that allow such systems or equipment to operate automatically only when the primary equipment is not operating. | | --- | --- | | | 2. Multiple units of the same equipment type with combined capacities exceeding the design load and provided with controls that are configured to sequence the operation of each unit based on load. |

History

• Statutory Authority: RCW 19.27A.020, 19.27A.025, 19.27A.160 and chapter 19.27 RCW. WSR 19-24-040, § 51-11C-40331, filed 11/26/19, effective 7/1/20. Statutory Authority: RCW 19.27A.025, 19.27A.160, and 19.27.074. WSR 16-03-072, § 51-11C-40331, filed 1/19/16, effective 7/1/16. Statutory Authority: RCW 19.27A.025, 19.27A.045, 19.27.020, and 19.27.074. WSR 14-24-122, § 51-11C-40331, filed 12/3/14, effective 1/3/15. Statutory Authority: RCW 19.27A.020, 19.27A.025 and chapters 19.27 and 34.05 RCW. WSR 13-04-056, § 51-11C-40331, filed 2/1/13, effective 7/1/13.

Wash. Admin. Code § 51-11C-40332 Section C403.3.2—HVAC equipment performance requirements.

C403.3.2 HVAC equipment performance requirements. Equipment shall meet the minimum efficiency requirements of Tables C403.3.2(1) through C403.3.2(16) when tested and rated in accordance with the applicable test procedure. Plate-type liquid-to-liquid heat exchangers shall meet the minimum requirements of AHRI 400. The efficiency shall be verified through certification and listed under an approved certification program or, if no certification program exists, the equipment efficiency ratings shall be supported by data furnished by the manufacturer. Where multiple rating conditions or performance requirements are provided, the equipment shall satisfy all stated requirements. Where components, such as indoor or outdoor coils, from different manufacturers are used, calculations and supporting data shall be furnished by the designer that demonstrates that the combined efficiency of the specified components meets the requirements herein.

C403.3.2.1 Gas-fired and oil-fired forced air furnaces. Forced air furnaces with input ratings ≥ 225,000 Btu/h (65 kW) and all unit heaters shall also have an intermittent ignition or interrupted device (IID), and have either mechanical draft (including power venting) or a flue damper. A vent damper is an acceptable alternative to a flue damper for furnaces where combustion air is drawn from the conditioned space. All furnaces with input ratings ≥ 225,000 Btu/h (65 kW), including electric furnaces, that are not located within the conditioned space shall have jacket losses not exceeding 0.75 percent of the input rating.

C403.3.2.2 Hydronic and multiple-zone HVAC system controls and equipment. Hydronic and multiple-zone HVAC system controls and equipment shall comply with this section.

For buildings with a total equipment cooling capacity of 300 tons and above, the equipment shall comply with one of the following:

1. No one unit shall have a cooling capacity of more than 2/3 of the total installed cooling equipment capacity;

2. The equipment shall have a variable speed drive; or

3. The equipment shall have multiple compressors.

C403.3.2.3 Chillers. Chilled water plants and buildings with more than 500 tons total capacity shall not have more than 100 tons provided by air-cooled chillers.

| EXCEPTIONS: | 1. Where the designer demonstrates that the water quality at the building site fails to meet manufacturer's specifications for the use of water-cooled equipment. | | --- | --- | | | 2. Air-cooled chillers with minimum efficiencies at least 10 percent higher than those listed in Table C403.3.2(3). | | | 3. Replacement of existing air-cooled chiller equipment. | | | 4. Air-to-water heat pump units that are configured to provide both heating and cooling and that are rated in accordance with AHRI 550/590. |

C403.3.2.4 Water-cooled centrifugal chilling packages. Equipment not designed for operation at AHRI Standard 550/590 test conditions of 44.00°F (6.67°C) leaving and 54.00°F (12.22°C) entering chilled-water temperatures and with 85.00°F (29.44°C) entering and 94.30°F (34.61°C) leaving condenser-fluid temperatures, shall have maximum full-load kW/ton (FL) and part-load ratings adjusted using the following equations.

| FL adj | = | FL/Kadj | | --- | --- | --- |

(Equation 4-7)

| PLVadj | = | IPLV.IP/Kadj | | --- | --- | --- |

(Equation 4-8)

| Where: | | | | --- | --- | --- | | Kadj | = | A × B | | FL | = | Full-load kW/ton values as specified in Table C403.3.2(7) | | FLadj | = | Maximum full-load kW/ton rating, adjusted for nonstandard conditions | | IPLV.IP | = | Value as specified in Table C403.3.2(7) | | PLVadj | = | Maximum NPLV rating, adjusted for nonstandard conditions | | A | = | 0.00000014592 × (LIFT)4 - 0.0000346496 × (LIFT)3+ 0.00314196 × (LIFT)2 - 0.147199 × LIFT + 3.93073 | | B | = | 0.0015 × LvgEvap (° F) + 0.934 | | LIFT | = | LvgCond - LvgEvap | | LvgCond | = | Full-load condenser leaving fluid temperature (°F) | | LvgEvap | = | Full-load evaporator leaving temperature (°F) |

The FLadj and PLVadj values are applicable only for centrifugal chillers meeting all of the following full-load design ranges:

• 36.00°F ≤ LvgEvap ≤ 60.00°F

• LvgCond ≤ 115.00°F

• 20.00°F ≤ LIFT ≤ 80.00°F

Manufacturers shall calculate the FLadj and PLVadj before determining whether to label the chiller. Centrifugal chillers designed to operate outside of these ranges are not covered by this code.

C403.3.2.5 Positive displacement (air- and water-cooled) chilling packages. Equipment with a leaving fluid temperature higher than 32°F (0°C) and water-cooled positive displacement chilling packages with a condenser leaving fluid temperature below 115°F (46°C) shall meet the requirements the tables in Section C403.3.2 when tested or certified with water at standard rating conditions, in accordance with the referenced test procedure.

C403.3.2.6 Packaged and split system electric heating and cooling equipment. Packaged and split system equipment providing both electric heating and cooling, and cooling-only equipment with electric heat in the main supply duct before VAV boxes, in each case with a total cooling capacity greater than 6,000 Btu/h shall be a heat pump configured to operate in heat pump mode whenever the outdoor air temperature is above 25°F (-3.9°C) and the unit is not in defrost. The unit shall have reverse-cycle demand defrost.

| EXCEPTION: | Unstaffed equipment shelters or cabinets used solely for personal wireless service facilities. | | --- | --- |

C403.3.2.7 Humidification. If an air economizer is required on a cooling system for which humidification equipment is to be provided to maintain minimum indoor humidity levels, then the humidifier shall be of the adiabatic type (direct evaporative media or fog atomization type).

| EXCEPTIONS: | 1. Health care facilities licensed by the state where chapter 246-320 or 246-330 WAC requires steam injection humidifiers in duct work downstream of final filters. | | --- | --- | | | 2. Systems with water economizer. | | | 3. 100 percent outside air systems with no provisions for air recirculation to the central supply fan. | | | 4. Nonadiabatic humidifiers cumulatively serving no more than 10 percent of a building's air economizer capacity as measured in cfm. This refers to the system cfm serving rooms with stand alone or duct mounted humidifiers. |

History

• Statutory Authority: RCW 19.27A.045 and chapter 19.27A RCW. WSR 24-16-145, § 51-11C-40332, filed 8/7/24, effective 9/7/24. Statutory Authority: RCW 19.27A.020, 19.27A.025, 19.27A.160 and chapters 19.27A and 19.27 RCW. WSR 22-14-091, 23-12-101, and 23-20-021, § 51-11C-40332, filed 7/1/22, 6/7/23, and 9/25/23, effective 3/15/24. Statutory Authority: RCW 19.27A.020, 19.27A.025, 19.27A.160 and chapter 19.27 RCW. WSR 19-24-040, § 51-11C-40332, filed 11/26/19, effective 7/1/20. Statutory Authority: RCW 19.27A.025, 19.27A.160, and 19.27.074. WSR 16-03-072, § 51-11C-40332, filed 1/19/16, effective 7/1/16. Statutory Authority: RCW 19.27A.025, 19.27A.045, and 19.27.074. WSR 13-20-120, § 51-11C-40332, filed 10/1/13, effective 11/1/13. Statutory Authority: RCW 19.27A.020, 19.27A.025 and chapters 19.27 and 34.05 RCW. WSR 13-04-056, § 51-11C-40332, filed 2/1/13, effective 7/1/13.

Wash. Admin. Code § 51-11C-403321 Table C403.3.2(1)—Electrically operated unitary air conditioners and condensing units.

Table C403.3.2(1)

Minimum Efficiency Requirements—Electrically Operated Unitary Air Conditioners and Condensing Unitsc,d

| Equipment Type | Size Category | Heating Section Type | Subcategory or Rating Condition | Minimum Efficiency | Test Procedurea | | --- | --- | --- | --- | --- | --- | | Air conditioners, air cooled | < 65,000 Btu/hb | All | Split System, three phase and applications outside U.S. single phaseb | 13.4 SEER2 | AHRI 201/240-2023 | | Single package, three phase and applications outside U.S. single phaseb | 13.4 SEER2 | | | | | | Space constrained, air cooled | ≤ 30,000 Btu/hb | All | Split System, three phase and applications outside U.S. single phaseb | 11.7 SEER2 | | | Single package, three phase and applications outside U.S. single phaseb | 11.7 SEER2 | | | | | | Small duct high velocity, air cooled | ≤ 65,000 Btu/hb | All | Split System, three phase and applications outside U.S. single phaseb | 12.1 SEER2 | | | Air conditioners, air cooled | ≥ 65,000 Btu/h and < 135,000 Btu/h | Electric Resistance (or None) | Split System and Single Package | 11.2 EER 14.8 IEER | AHRI 340/360 | | All other | Split System and Single Package | 11.0 EER 14.6 IEER | | | | | ≥ 135,000 Btu/h and < 240,000 Btu/h | Electric Resistance (or None) | Split System and Single Package | 11.0 EER 14.2 IEER | | | | All other | Split System and Single Package | 10.8 EER 14.0 IEER | | | | | ≥ 240,000 Btu/h and < 760,000 Btu/h | Electric Resistance (or None) | Split System and Single Package | 10.0 EER 13.2 IEER | | | | All other | Split System and Single Package | 9.8 EER 13.0 IEER | | | | | ≥ 760,000 Btu/h | Electric Resistance (or None) | Split System and Single Package | 9.7 EER 12.5 IEER | | | | All other | Split System and Single Package | 9.5 EER 12.3 IEER | | | | | Air conditioners, water cooled | < 65,000 Btu/hb | All | Split System and Single Package | 12.1 EER 12.3 IEER | AHRI 210/240 | | ≥ 65,000 Btu/h and < 135,000 Btu/h | Electric Resistance (or None) | Split System and Single Package | 12.1 EER 13.9 IEER | AHRI 340/360 | | | All other | Split System and Single Package | 11.9 EER 13.7 IEER | | | | | ≥ 135,000 Btu/h and < 240,000 Btu/h | Electric Resistance (or None) | Split System and Single Package | 12.5 EER 13.9 IEER | | | | All other | Split System and Single Package | 12.3 EER 13.7 IEER | | | | | ≥ 240,000 Btu/h and < 760,000 Btu/h | Electric Resistance (or None) | Split System and Single Package | 12.4 EER 13.6 IEER | | | | All other | Split System and Single Package | 12.2 EER 13.4 IEER | | | | | ≥ 760,000 Btu/h | Electric Resistance (or None) | Split System and Single Package | 12.2 EER 13.5 IEER | | | | All other | Split System and Single Package | 12.0 EER 13.3 IEER | | | | | Air conditioners, evaporatively cooled | < 65,000 Btu/hb | All | Split System and Single Package | 12.1 EER 12.3 IEER | AHRI 210/240 | | ≥ 65,000 Btu/h and < 135,000 Btu/h | Electric Resistance (or None) | Split System and Single Package | 12.1 EER 12.3 IEER | AHRI 340/360 | | | All other | Split System and Single Package | 11.9 EER 12.1 IEER | | | | | ≥ 135,000 Btu/h and < 240,000 Btu/h | Electric Resistance (or None) | Split System and Single Package | 12.0 EER 12.2 IEER | | | | All other | Split System and Single Package | 11.8 EER 12.0 IEER | | | | | ≥ 240,000 Btu/h and < 760,000 Btu/h | Electric Resistance (or None) | Split System and Single Package | 11.9 EER 12.1 IEER | | | | All other | Split System and Single Package | 11.7 EER 11.9 IEER | | | | | ≥ 760,000 Btu/h | Electric Resistance (or None) | Split System and Single Package | 11.7 EER 11.9 EER | | | | All other | Split System and Single Package | 11.5 EER 11.7 EER | | | | | Condensing units, air cooled | ≥ 135,000 Btu/h | | | 10.5 EER 11.8 IEER | AHRI 365 | | Condensing units, water cooled | ≥ 135,000 Btu/h | | | 13.5 EER 14.0 IEER | | | Condensing units, evaporatively cooled | ≥ 135,000 Btu/h | | | 13.5 EER 14.0 IEER | |

| For SI: 1 British thermal unit per hour = 0.2931 W. | | | | --- | --- | --- | | | a | Chapter 6 contains a complete specification of the referenced standards, which include test procedures, including the reference year version of the test procedure. | | | b | Single-phase, U.S. air-cooled air conditioners less than 65,000 Btu/h are regulated as consumer products by the U.S. Department of Energy Code of Federal Regulations DOE 10 C.F.R. 430. SEER and SEER2 values for single-phase products are set by the U.S. Department of Energy. | | | c | DOE 10 C.F.R. 430 Subpart B Appendix MI includes the test procedure updates effective 1/1/2023 that will be incorporated in AHRI 210/240-2023. | | | d | This table is a replica of ASHRAE 90.1 Table 6.8.1-1 Electrically Operated Unitary Air Conditioners and Condensing Units—Minimum Efficiency Requirements. |

History

• Statutory Authority: RCW 19.27A.020, 19.27A.025, 19.27A.160 and chapters 19.27A and 19.27 RCW. WSR 22-14-091, 23-12-101, and 23-20-021, § 51-11C-403321, filed 7/1/22, 6/7/23, and 9/25/23, effective 3/15/24.

Wash. Admin. Code § 51-11C-403322 Table C403.3.2(2)—Electrically operated air-cooled unitary heat pumps—Minimum efficiency requirements.

Table C403.3.2(2)

Electrically Operated Air-Cooled Unitary Heat Pumps—Minimum Efficiency Requirements

| Equipment Type | Size Category | Heating Section Type | Subcategory or Rating Condition | Minimum Efficiency | Test Procedurea | | --- | --- | --- | --- | --- | --- | | Air cooled (cooling mode) | < 65,000 Btu/h | All | Split System, three phase and applications outside U.S. single phaseb | 14.3 SEER2 | AHRI 201/240-2023 | | Single Package, three phase and applications outside U.S. single phaseb | 13.4 SEER2 | | | | | | Space constrained, air cooled | ≤ 30,000 Btu/h | All | Split System, three phase and applications outside U.S. single phaseb | 11.7 SEER2 | | | Single Package, three phase and applications outside U.S. single phaseb | 11.7 SEER2 | | | | | | Single duct high velocity, air cooled (cooling mode) | ≤ 65,000 Btu/h | All | Split System, three phase and applications outside U.S. single phaseb | 12.0 SEER2 | | | Air cooled (cooling mode) | ≥ 65,000 Btu/h and < 135,000 Btu/h | Electric Resistance (or None) | Split System and Single Package | 11.0 EER 14.1 IEER | AHRI 340/360 | | All other | Split System and Single Package | 10.8 EER 13.9 IEER | | | | | ≥ 135,000 Btu/h and < 240,000 Btu/h | Electric Resistance (or None) | Split System and Single Package | 10.6 EER 13.5 IEER | | | | All other | Split System and Single Package | 10.4 EER 13.3 IEER | | | | | ≥ 240,000 Btu/h | Electric Resistance (or None) | Split System and Single Package | 9.5 EER 12.5 IEER | | | | All other | Split System and Single Package | 9.3 EER 12.3 IEER | | | | | Air cooled (heating mode) | < 65,000 Btu/hb | - | Split System, three phase and applications outside U.S. single phaseb | 7.5 HSPF | AHRI 201/240-2023 | | - | Single Package, three phase and applications outside U.S. single phaseb | 6.7 HSPF | | | | | Space constrained, air cooled (heating mode) | ≤ 30,000 Btu/h | - | Split System, three phase and applications outside U.S. single phaseb | 6.3 HSPF | | | - | Single Package, three phase and applications outside U.S. single phaseb | 6.3 HSPF | | | | | Small-duct high velocity air cooled (heating mode) | < 65,000 Btu/h | - | Split System, three phase and applications outside U.S. single phaseb | 6.1 HSPF | | | Air cooled (heating mode) | ≥ 65,000 Btu/h and < 135,000 Btu/h (cooling capacity) | - | 47ºF db/43ºF wb Outdoor Air | 3.40 COPH | AHRI 340/360 | | 17ºF db/15ºF wb Outdoor Air | 2.25 COPH | | | | | | ≥ 135,000 Btu/h and < 240,000 Btu/h (cooling capacity) | - | 47ºF db/43ºF wb Outdoor Air | 3.30 COPH | | | | 17ºF db/15ºF wb Outdoor Air | 2.05 COPH | | | | | | ≥ 240,000 Btu/h (cooling capacity) | | 47ºF db/43ºF wb Outdoor Air | 3.20 COPH | | | | | 17ºF db/15ºF wb Outdoor Air | 2.05 COPH | | | |

| For SI: 1 British thermal unit per hour = 0.2931 W, °C = [(°F) - 32]/1.8. | | | | --- | --- | --- | | | a | Chapter 6 contains a complete specification of the referenced standards, which include test procedures, including the reference year version of the test procedure. | | | b | Single-phase, U.S. air-cooled heat pumps less than 65,000 Btu/h are regulated as consumer products by the U.S. Department of Energy Code of Federal Regulations DOE 10 C.F.R. 430. SEER, SEER2, and HSPF values for single-phase products are set by the U.S. Department of Energy. | | | c | DOE 10 C.F.R. 430 Subpart B Appendix MI includes the test procedure updates effective 1/1/2023 that will be incorporated into AHRI 210/240-2023. | | | d | This table is a replica of ASHRAE 90.1 Table 6.8.1-2 Electrically Operated Air-Cooled Unitary Heat Pumps—Minimum Efficiency Requirements. |

Reviser's note: The brackets and enclosed material in the text of the above section occurred in the copy filed by the agency.

Wash. Admin. Code § 51-11C-403323 Table C403.3.2(3)—Water chilling packages—Minimum efficiency requirements.

Table C403.3.2(3)

Water Chilling Packages—Minimum Efficiency Requirementsa,b,e,f

| | Size Category | | Path A | Path B | Test Procedurec | | | | --- | --- | --- | --- | --- | --- | --- | --- | | Equipment Type | Units | FL | IPLV.IP | FL | IPLV.IP | | | | Air-cooled chillers | < 150 tons | EER(Btu/Wh) | ≥ 10.100 | ≥ 13.700 | ≥ 9.700 | ≥ 15.800 | | | ≥ 150 tons | EER(Btu/Wh) | ≥ 10.100 | ≥ 14.000 | ≥ 9.700 | ≥ 16.100 | | | | Air cooled without condenser, electrically operated | All capacities | EER(Btu/Wh) | Air-cooled chillers without condensers shall be rated with matching condensers and comply with the air-cooled chiller efficiency requirements | | | | | | Water cooled, electrically operated, positive displacement | < 75 tons | kW/ton | ≤ 0.750 | ≤ 0.600 | ≤ 0.780 | ≤ 0.500 | | | ≥ 75 tons and < 150 tons | kW/ton | ≤ 0.720 | ≤ 0.560 | ≤ 0.750 | ≤ 0.490 | AHRI 550/590 | | | ≥ 150 tons and < 300 tons | kW/ton | ≤ 0.660 | ≤ 0.540 | ≤ 0.680 | ≤ 0.440 | | | | ≥ 300 tons and < 600 tons | kW/ton | ≤ 0.610 | ≤ 0.520 | ≤ 0.625 | ≤ 0.410 | | | | | ≥ 600 tons | kW/ton | ≤ 0.560 | ≤ 0.500 | ≤ 0.585 | ≤ 0.380 | | | Water cooled, electrically operated, centrifugal | < 150 tons | kW/ton | ≤ 0.610 | ≤ 0.550 | ≤ 0.695 | ≤ 0.440 | | | ≥ 150 tons and < 300 tons | kW/ton | ≤ 0.610 | ≤ 0.550 | ≤ 0.695 | ≤ 0.400 | | | | ≥ 300 tons and < 400 tons | kW/ton | ≤ 0.560 | ≤ 0.520 | ≤ 0.595 | ≤ 0.390 | | | | ≥ 400 tons and < 600 tons | kW/ton | ≤ 0.560 | ≤ 0.500 | ≤ 0.585 | ≤ 0.380 | | | | ≥ 600 tons | kW/ton | ≤ 0.560 | ≤ 0.500 | ≤ 0.585 | ≤ 0.380 | | | | Air cooled absorption, single effect | All capacities | COP(W/W) | ≥ 0.600 | NR | NAd | NAd | | | Water cooled absorption, single effect | All capacities | COP(W/W) | ≥ 0.700 | NR | NAd | NAd | AHRI 560 | | Absorption double effect, indirect fired | All capacities | COP(W/W) | ≥ 1.000 | ≥ 1.050 | NAd | NAd | | | Absorption double effect, direct fired | All capacities | COP(W/W) | ≥ 1.000 | ≥ 1.000 | NAd | NAd | |

| For SI: 1 ton = 3517 W, 1 British thermal unit per hour = 0.2931 W, °C = [(°F) - 32]/1.8. | | | | --- | --- | --- | | | NR = No requirement. | | | | a | Chapter 6 contains a complete specification of the referenced standards, which includes test procedures, including the referenced year version of the test procedure. | | | b | The requirements for centrifugal chiller shall be adjusted for nonstandard rating conditions per Section C403.3.2.4 and are applicable only for the range of conditions listed there. The requirements for air-cooled, water-cooled positive displacement and absorption chillers are at standard rating conditions defined in the referenced test procedure. | | | c | Both the full load and IPLV.IP requirements must be met or exceeded to comply with this standard. When there is a Path B, compliance can be with either Path A or Path B for any application. | | | d | NA means the requirements are not applicable for Path B and only Path A can be used for compliance. | | | e | FL is the full-load performance requirements, and IPLV.IP is for the part-load performance requirements. | | | f | This table is a replica of ASHRAE 90.1 Table 6.8.1-3 Water-Chilling Packages—Minimum Efficiency Requirements. |

Reviser's note: The brackets and enclosed material in the text of the above section occurred in the copy filed by the agency.

Wash. Admin. Code § 51-11C-403324 Table C403.3.2(4)—Minimum efficiency requirements—Electrically operated PTAC, PTHP, SPVAC, SPVHP, room air conditioners.

Table C403.3.2(4)

Electrically Operated Packaged Terminal Air Conditioners, Packaged Terminal Heat Pumps, Single-Package Vertical Air Conditioners, Single-Package Vertical Heat Pumps, Room Air Conditioners and Room Air-Conditioner Heat Pumps—Minimum Efficiency Requirementse

| Equipment Type | Size Category (Input) | Subcategory or Rating Condition | Minimum Efficiency | Test Procedurea | | --- | --- | --- | --- | --- | | PTAC (cooling mode) Standard size | < 7,000 Btu/h | 95°F db/75°F wb outdoor airc | 11.9 EER | AHRI 310/380 | | ≥ 7,000 Btu/h and ≤ 15,000 Btu/h | 14.0 - (0.300 × Cap/1000) EERd | | | | | > 15,000 Btu/h | 9.5 EER | | | | | PTAC (cooling mode) Nonstandard sizea | < 7,000 Btu/h | 95°F db/75°F wb outdoor airc | 9.4 EER | AHRI 310/380 | | ≥ 7,000 Btu/h and ≤ 15,000 Btu/h | 10.9 - (0.213 × Cap/1000) EERd | | | | | > 15,000 Btu/h | 7.7 EER | | | | | PTHP (cooling mode) Standard size | < 7,000 Btu/h | 95°F db/75°F wb outdoor airc | 11.9 EER | AHRI 310/380 | | ≥ 7,000 Btu/h and ≤ 15,000 Btu/h | 14.0 - (0.300 × Cap/1000) EERd | | | | | > 15,000 Btu/h | 9.5 EER | | | | | PTHP (cooling mode) Nonstandard sizeb | < 7,000 Btu/h | 95°F db/75°F wb outdoor airc | 9.3 EER | AHRI 310/380 | | ≥ 7,000 Btu/h and ≤ 15,000 Btu/h | 10.8 - (0.213 × Cap/1000) EERd | | | | | > 15,000 Btu/h | 7.6 EER | | | | | PTHP (heating mode) Standard size | < 7,000 Btu/h | 47°F db/43°F wb outdoor air | 3.3 COPH | AHRI 310/380 | | ≥ 7,000 Btu/h and ≤ 15,000 Btu/h | 3.7 - (0.052 × Cap/1000) COPHd | | | | | > 15,000 Btu/h | 2.90 COPH | | | | | PTHP (heating mode) Nonstandard sizeb | < 7,000 Btu/h | 47°F db/43°F wb outdoor air | 2.7 COPH | AHRI 310/380 | | ≥ 7,000 Btu/h and ≤ 15,000 Btu/h | 2.9 - (0.026 × Cap/1000) COPHd | | | | | > 15,000 Btu/h | 2.5 COPH | | | | | SPVAC (cooling mode) | < 65,000 Btu/h | 95°F db/75°F wb outdoor airc | 11.0 EER | AHRI 390 | | ≥ 65,000 Btu/h and < 135,000 Btu/h | 10.0 EER | | | | | ≥ 135,000 Btu/h and < 240,000 Btu/h | 10.0 EER | | | | | SPVHP (cooling mode) | < 65,000 Btu/h | 95°F db/75°F wb outdoor airc | 11.0 EER | AHRI 390 | | ≥ 65,000 Btu/h and < 135,000 Btu/h | 10.0 EER | | | | | ≥ 135,000 Btu/h and < 240,000 Btu/h | 10.0 EER | | | | | SPVHP (heating mode) | <65,000 Btu/h | 47°F db/43°F wb outdoor air | 3.3 COP | AHRI 390 | | ≥ 65,000 Btu/h and < 135,000 Btu/h | 3.0 COP | | | | | ≥ 135,000 Btu/h and < 240,000 Btu/h | 3.0 COP | | | | | Room air conditioners without reverse cycle with louvered sides for applications outside U.S. | < 6,000 Btu/h | - | 11.0 CEER | ANSI/AHAMRAC-1 | | ≥ 6,000 Btu/h and < 8,000 Btu/h | - | 11.0 CEER | | | | ≥ 8,000 Btu/h and < 14,000 Btu/h | - | 10.9 CEER | | | | ≥ 14,000 Btu/h and < 20,000 Btu/h | - | 10.7 CEER | | | | ≥ 20,000 Btu/h and < 28,000 Btu/h | - | 9.4 CEER | | | | ≥ 28,000 Btu/h | - | 9.0 CEER | | | | Room air conditioners without louvered sides | < 6,000 Btu/h | - | 10.0 CEER | ANSI/AHAMRAC-1 | | ≥ 6,000 Btu/h and < 8,000 Btu/h | - | 10.0 CEER | | | | ≥ 8,000 Btu/h and < 11,000 Btu/h | - | 9.6 CEER | | | | ≥ 11,000 Btu/h and < 14,000 Btu/h | - | 9.5 CEER | | | | ≥ 14,000 Btu/h and < 20,000 Btu/h | - | 9.3 CEER | | | | ≥ 20,000 Btu/h | - | 9.4 CEER | | | | Room air conditioners with reverse cycle, with louvered sides for applications outside U.S. | < 20,000 Btu/h | - | 9.8 CEER | ANSI/AHAMRAC-1 | | ≥ 20,000 Btu/h | - | 9.3 CEER | | | | Room air conditioners with reverse cycle without louvered sides for applications outside U.S. | < 14,000 Btu/h | - | 9.3 CEER | ANSI/AHAMRAC-1 | | ≥ 14,000 Btu/h | - | 8.7 CEER | | | | Room air conditioners, casement only for applications outside U.S. | All capacities | - | 9.5 CEER | ANSI/AHAMRAC-1 | | Room air conditioners, casement-slider for application outside U.S. | All capacities | - | 10.4 CEER | ANSI/AHAMRAC-1 |

| For SI: 1 British thermal unit per hour = 0.2931 W, °C = [(°F) - 32]/1.8. | | | | --- | --- | --- | | | | "Cap" = The rated cooling capacity of the product in Btu/h. If the unit's capacity is less than 7,000 Btu/h, use 7,000 Btu/h in the calculation. If the unit's capacity is greater than 15,000 Btu/h, use 15,000 Btu/h in the calculations. | | | a | Chapter 6 contains a complete specification of the referenced standards, which include test procedures, including the referenced year version of the test procedure. | | | b | Nonstandard size units must be factory labeled as follows: "MANUFACTURED FOR NONSTANDARD SIZE APPLICATIONS ONLY: NOT TO BE INSTALLED IN NEW STANDARD PROJECTS." Nonstandard size efficiencies apply only to units being installed in existing sleeves having an external wall opening of less than 16 inches (406 mm) high or less than 42 inches (1067 mm) wide and having a cross-sectional area less than 670 square inches (0.43 m2). | | | c | The cooling-mode wet bulb temperature requirement only applies for units that reject condensate to the condenser coil. | | | d | "Cap" in EER and COPH equations for PTACs and PTHPs means cooling capacity in Btu/h at 95°F outdoor dry-bulb temperature. | | | e | This table is a replica of ASHRAE 90.1 Table 6.8.1-4 Electrically Operated Packaged Terminal Air Conditioners, Packaged Terminal Heat Pumps, Single-Package Vertical Air Conditioners, Single-Package Vertical Heat Pumps, Room Air Conditioners, and Room Air-Conditioner Heat Pumps—Minimum Efficiency Requirements. |

History

• (°F) - 32]/1.8. "Cap" = The rated cooling capacity of the product in Btu/h. If the unit's capacity is less than 7,000 Btu/h, use 7,000 Btu/h in the calculation. If the unit's capacity is greater than 15,000 Btu/h, use 15,000 Btu/h in the calculations. aChapter 6 contains a complete specification of the referenced standards, which include test procedures, including the referenced year version of the test procedure. bNonstandard size units must be factory labeled as follows: "MANUFACTURED FOR NONSTANDARD SIZE APPLICATIONS ONLY: NOT TO BE INSTALLED IN NEW STANDARD PROJECTS." Nonstandard size efficiencies apply only to units being installed in existing sleeves having an external wall opening of less than 16 inches (406 mm) high or less than 42 inches (1067 mm) wide and having a cross-sectional area less than 670 square inches (0.43 m2). cThe cooling-mode wet bulb temperature requirement only applies for units that reject condensate to the condenser coil. d"Cap" in EER and COPH equations for PTACs and PTHPs means cooling capacity in Btu/h at 95°F outdoor dry-bulb temperature. eThis table is a replica of ASHRAE 90.1 Table 6.8.1-4 Electrically Operated Packaged Terminal Air Conditioners, Packaged Terminal Heat Pumps, Single-Package Vertical Air Conditioners, Single-Package Vertical Heat Pumps, Room Air Conditioners, and Room Air-Conditioner Heat Pumps—Minimum Efficiency Requirements.[Statutory Authority: RCW 19.27A.020, 19.27A.025, 19.27A.160 and chapters 19.27A and 19.27 RCW. WSR 22-14-091, 23-12-101, and 23-20-021, § 51-11C-403324, filed 7/1/22, 6/7/23, and 9/25/23, effective 3/15/24.

Wash. Admin. Code § 51-11C-403325 Table C403.3.2(5)—Minimum efficiency requirements—Warm air furnaces and unit heaters.

Table C403.3.2(5)

Warm Air Furnaces and Combination Warm Air Furnaces/Air-Conditioning Units, Warm Air Duct Furnaces and Unit Heaters—Minimum Efficiency Requirements

| Equipment Type | Size Category (Input) | Subcategory or Rating Condition | Minimum Efficiencyd,c | Test Procedurea | | --- | --- | --- | --- | --- | | Warm-air furnace, gas fired for application outside the U.S. | < 225,000 Btu/h | Maximum capacityc | 80% AFUE (nonweatherized) or 1% AFUE (weatherized) or 80% Etb,d | DOE 10 C.F.R. 430 Appendix N or Section 2.39, Thermal Efficiency, ANSI Z21.47 | | Warm-air furnace, gas fired | < 225,000 Btu/h | Maximum capacityc | 80% Etb,d before 1/1/2023 81% Etd after 1/1/2023 | Section 2.39, Thermal Efficiency, ANSI Z21.47 | | Warm-air furnace, oil fired | < 225,000 Btu/h | Maximum capacityc | 83% AFUE (nonweatherized) or 78% AFUE (weatherized) or 80% Etb,d | DOE 10 C.F.R. 430 Appendix N or Section 42, Combustion UL 727 | | Warm-air furnace, oil fired | < 225,000 Btu/h | Maximum capacityc | 80% Et before 1/1/2023 82% Etd after 1/1/2023 | Section 42, Combustion UL 727 | | Electric furnaces for applications outside the U.S. | < 225,000 Btu/h | All | 96% AFUE | DOE 10 C.F.R. 430 Appendix N | | Warm air duct furnaces, gas fired | All capacities | Maximum capacityc | 80% Ece | Section 2.10, Efficiency, ANSI Z83.8 | | Warm air unit heaters, gas fired | All capacities | Maximum capacityc | 80% Ece,f | Section 2.10, Efficiency, ANSI Z83.8 | | Warm air unit heaters, oil fired | All capacities | Maximum capacityc | 80% Ece,f | Section 40, Combustion, UL 731 |

| For SI: 1 British thermal unit per hour = 0.2931 W. | | | | | | --- | --- | --- | --- | --- | | | a | Chapter 6 contains a complete specification of the referenced standards, which include test procedures, including the referenced year version of the test procedure. | | | | | b | Combination units (i.e., furnaces contained within the same cabinet as an air conditioner) not covered by DOE 10 C.F.R. 430 (i.e., 3-phase power or with cooling capacity greater than or equal to 65,000 Btu/h) may comply with either rating. All other units greater than 225,000 Btu/h sold in the U.S. must meet the AFUE standards for consumer products and testing using U.S. DOE's AFUE test procedure at DOE 10 C.F.R. 430 Subpart B, Appendix N. | | | | | c | Compliance of multiple firing rate units shall be at the maximum firing rate. | | | | | d | Et | = | Thermal efficiency. Units must also include an interrupted or intermittent ignition device (IID), have jacket losses not exceeding 0.75 percent of the input rating, and have either power venting or a flue damper. A vent damper is an acceptable alternative to a flue damper for those furnaces where combustion air is drawn from the conditioned space. | | | e | Ec | = | Combustion efficiency (100% less flue losses). See test procedure for detailed discussion. | | | f | Units must also include an interrupted or intermittent ignition device (IID) and have either power venting or an automatic flue damper. | | | | | g | This table is a replica of ASHRAE 90.1 Table 6.8.1-5 Warm-Air Furnaces and Combination Warm-Air Furnaces/Air-Conditioning Units, Warm-Air Duct Furnaces, and Unit Heaters—Minimum Efficiency Requirements. | | |

History

• Statutory Authority: RCW 19.27A.020, 19.27A.025, 19.27A.160 and chapters 19.27A and 19.27 RCW. WSR 22-14-091, 23-12-101, and 23-20-021, § 51-11C-403325, filed 7/1/22, 6/7/23, and 9/25/23, effective 3/15/24.

Wash. Admin. Code § 51-11C-403326 Table C403.3.2(6)—Minimum efficiency requirements—Gas-fired and oil-fired boilers.

Table C403.3.2(6)

Gas- and Oil-Fired Boilers—Minimum Efficiency Requirements

| Equipment Typea | Subcategory or Rating Condition | Size Category (Input) | Minimum Efficiency | Test Procedurea | | --- | --- | --- | --- | --- | | Boilers, hot water | Gas-fired | < 300,000 Btu/hg,h for applications outside the U.S. | 82% AFUE | DOE 10 C.F.R. 430 Appendix N | | ≥ 300,000 Btu/h and ≤ 2,500,000 Btu/he | 84% Etd | DOE 10 C.F.R. 431.86 | | | | > 2,500,000 Btu/h and ≤ 10,000,000 Btu/hb | 85% Etd | | | | | > 10,000,000 Btu/hb | 82% Ecc | | | | | Oil-firedf | < 300,000 Btu/hg,h | 84% AFUE | DOE 10 C.F.R. 430 Appendix N | | | ≥ 300,000 Btu/h and ≤ 2,500,000 Btu/he | 87% Etd | DOE 10 C.F.R. 431.86 | | | | > 2,500,000 Btu/hb | 88% Ecc | | | | | > 10,000,000 Btu/hb | 84% Ecd | | | | | Boilers, steam | Gas-fired | < 300,000 Btu/hg | 81% AFUE | DOE 10 C.F.R. 430 Appendix N | | Gas-fired - all, except natural draft | ≥ 300,000 Btu/h and ≤ 2,500,000 Btu/hb | 82% Etd | DOE 10 C.F.R. 431.86 | | | > 2,500,000 Btu/ha | 79% Etd | | | | | > 10,000,000 Btu/hb | 79% Etd | | | | | Gas-fired - natural draft | ≥ 300,000 Btu/h and ≤ 2,500,000 Btu/hb | 81% Etd | | | | > 2,500,000 Btu/hb | 82% Etd | | | | | > 10,000,000 Btu/hb | 79% Etd | | | | | Oil-firedf | < 300,000 Btu/h | 82% AFUE | DOE 10 C.F.R. 430 Appendix N | | | ≥ 300,000 Btu/h and ≤ 2,500,000 Btu/hb | 84% Etd | DOE 10 C.F.R. 431.86 | | | | > 2,500,000 Btu/hb | 85% Etd | | | | | > 10,000,000 Btu/hb | 81% Etd | | | |

| For SI: 1 British thermal unit per hour = 0.2931 W. | | | | | | --- | --- | --- | --- | --- | | | a | Chapter 6 contains a complete specification of the referenced standards, which include test procedures, including the reference year version of the test procedure. | | | | | b | These requirements apply to boilers with rated input of 8,000,000 Btu/h or less that are not packaged boilers and to all packaged boilers. Minimum efficiency requirements for boilers cover all capacities of packaged boilers. | | | | | c | Ec | = | Combustion efficiency (100 percent less flue losses). | | | d | Et | = | Thermal efficiency. | | | e | Maximum capacity – Minimum and maximum ratings as provided for and allowed by the unit's controls. | | | | | f | Includes oil-fired (residual). | | | | | g | Boilers shall not be equipped with a constant burning pilot light. | | | | | h | A boiler not equipped with a tankless domestic water heating coil shall be equipped with an automatic means for adjusting the temperature of the water such that an incremental change in inferred heat load produces a corresponding incremental change in the temperature of the water supplied. | | | | | i | This table is a replica of ASHRAE 90.1 Table 6.8.1-6 Gas- and Oil-Fired Boilers—Minimum Efficiency Requirements. | | |

History

• Statutory Authority: RCW 19.27A.020, 19.27A.025, 19.27A.160 and chapters 19.27A and 19.27 RCW. WSR 22-14-091, 23-12-101, and 23-20-021, § 51-11C-403326, filed 7/1/22, 6/7/23, and 9/25/23, effective 3/15/24.

Wash. Admin. Code § 51-11C-403327 Table C403.3.2(7)—Heat rejection equipment—Minimum efficiency requirements.

Table C403.3.2(7)

Heat Rejection Equipment—Minimum Efficiency Requirementsi

| Equipment Typea | Total System Heat Rejection Capacity at Rated Conditions | Subcategory or Rating Conditionh | Performance Requiredb,c,d,f,g | Test Procedurea,e | | --- | --- | --- | --- | --- | | Propeller or axial fan open-circuit cooling towers | All | 95°F Entering Water 85°F Leaving Water 75°F Entering wb | ≥ 40.2 gpm/hp | CTI ATC-105 and CTI STD-201 RS | | Centrifugal fan open circuit cooling towers | All | 95°F Entering Water 85°F Leaving Water 75°F Entering wb | ≥ 20.0 gpm/hp | CTI ATC-105 and CTI STD-201 RS | | Propeller or axial fan closed-circuit cooling towers | All | 102°F Entering Water 90°F Leaving Water 75°F Entering wb | ≥ 16.1 gpm/hp | CTI ATC-105S and CTI STD-201 RS | | Centrifugal closed-circuit cooling towers | All | 102°F Entering Water 90°F Leaving Water 75°F Entering wb | ≥ 7.0 gpm/hp | CTI ATC-105S and CTI STD-201 RS | | Propeller or axial fan dry coolers (air-cooled fluid coolers) | All | 115°F Entering Water 105°F Leaving Water 95°F Entering wb | ≥ 4.5 gpm/hp | CTI ATC-106 | | Propeller or axial fan evaporative condensers | All | R-448A Test Fluid 165°F Entering Gas Temperature 105°F Condensing Temperature 75°F Entering wb | ≥ 160,000 Btu/h • hp | CTI ATC-106 | | Propeller or axial fan evaporative condensers | All | Ammonia Test Fluid 140°F Entering Gas Temperature 96.3°F Condensing Temperature 75°F Entering wb | ≥ 134,000 Btu/h • hp | CTI ATC-106 | | Centrifugal fan evaporative condensers | All | R-448A Test Fluid 165°F Entering Gas Temperature 105°F Condensing Temperature 75°F Entering wb | ≥ 137,000 Btu/h • hp | CTI ATC-106 | | Centrifugal fan evaporative condensers | All | Ammonia Test Fluid 140°F Entering Gas Temperature 96.3°F Condensing Temperature 75°F Entering wb | ≥ 110,000 Btu/h • hp | CTI ATC-106 | | Air cooled condensers | All | 125°F Condensing Temperature R-22 Test Fluid 190°F Entering Gas Temperature 15°F Subcooling 95°F Entering db | ≥ 176,000 Btu/h • hp | AHRI 460 |

| For SI: °C = [(°F) - 32]/1.8, L/s • kW = (gpm/hp)/(11.83), COP = (Btu/h • hp)/(2550.7). | | | --- | --- | | | db = dry-bulb temperature, °F. | | | wb = wet-bulb temperature, °F. | | a | Chapter 6 contains a complete specification of the referenced standards, which include test procedures, including the reference year version of the test procedure. | | b | For purposes of this table, open-circuit cooling tower performance is defined as the water-flow rating of the tower at the thermal rating condition listed in the table divided by the fan motor nameplate power. | | c | For purposes of this table, closed-circuit cooling tower performance is defined as the water-flow rating of the tower at the thermal rating condition divided by the sum of the fan motor nameplate power and the integral spray pump motor nameplate power. | | d | For purposes of this table, dry-cooler performance is defined as the process water-flow rating of the unit at the thermal rating condition listed in the table divided by the total fan motor nameplate power of the unit, and air-cooled condenser performance is defined as the heat rejected from the refrigerant divided by the total fan motor nameplate power of the unit. | | e | The efficiencies and test procedures for both open- and closed-circuit cooling towers are not applicable to hybrid cooling towers that contain a combination of separate wet and dry heat exchange sections. The certification requirements do not apply to field-erected cooling towers. | | f | All cooling towers shall comply with the minimum efficiency listed in the table for that specific type of tower with the capacity effect of any project-specific accessories and/or options included in the capacity of the cooling tower. | | g | For purposes of this table, evaporative condenser performance is defined as the heat rejected at the specified rating condition in the table, divided by the sum of the fan motor nameplate power and the integral spray pump nameplate power. | | h | Requirements for evaporative condensers are listed with ammonia (R-717) and R-448A as test fluids in the table. Evaporative condensers intended for use with halocarbon refrigerants other than R-448A must meet the minimum efficiency requirements listed above with R-448A as the test fluid. For ammonia, the condensing temperature is defined as the saturation temperature corresponding to the refrigerant pressure at the condenser entrance. For R-448A, which is a zeotropic refrigerant, the condensing temperature is defined as the arithmetic average of the dew point and the bubble point temperatures corresponding to the refrigerant pressure at the condenser entrance. | | i | This table is a replica of ASHRAE 90.1 Table 6.8.1-7 Performance Requirements for Heat Rejection Equipment—Minimum Efficiency Requirements. |

History

• (°F) - 32]/1.8, L/s • kW = (gpm/hp)/(11.83), COP = (Btu/h • hp)/(2550.7). db = dry-bulb temperature, °F. wb = wet-bulb temperature, °F.aChapter 6 contains a complete specification of the referenced standards, which include test procedures, including the reference year version of the test procedure.bFor purposes of this table, open-circuit cooling tower performance is defined as the water-flow rating of the tower at the thermal rating condition listed in the table divided by the fan motor nameplate power.cFor purposes of this table, closed-circuit cooling tower performance is defined as the water-flow rating of the tower at the thermal rating condition divided by the sum of the fan motor nameplate power and the integral spray pump motor nameplate power.dFor purposes of this table, dry-cooler performance is defined as the process water-flow rating of the unit at the thermal rating condition listed in the table divided by the total fan motor nameplate power of the unit, and air-cooled condenser performance is defined as the heat rejected from the refrigerant divided by the total fan motor nameplate power of the unit.eThe efficiencies and test procedures for both open- and closed-circuit cooling towers are not applicable to hybrid cooling towers that contain a combination of separate wet and dry heat exchange sections. The certification requirements do not apply to field-erected cooling towers.fAll cooling towers shall comply with the minimum efficiency listed in the table for that specific type of tower with the capacity effect of any project-specific accessories and/or options included in the capacity of the cooling tower.gFor purposes of this table, evaporative condenser performance is defined as the heat rejected at the specified rating condition in the table, divided by the sum of the fan motor nameplate power and the integral spray pump nameplate power.hRequirements for evaporative condensers are listed with ammonia (R-717) and R-448A as test fluids in the table. Evaporative condensers intended for use with halocarbon refrigerants other than R-448A must meet the minimum efficiency requirements listed above with R-448A as the test fluid. For ammonia, the condensing temperature is defined as the saturation temperature corresponding to the refrigerant pressure at the condenser entrance. For R-448A, which is a zeotropic refrigerant, the condensing temperature is defined as the arithmetic average of the dew point and the bubble point temperatures corresponding to the refrigerant pressure at the condenser entrance.iThis table is a replica of ASHRAE 90.1 Table 6.8.1-7 Performance Requirements for Heat Rejection Equipment—Minimum Efficiency Requirements.[Statutory Authority: RCW 19.27A.020, 19.27A.025, 19.27A.160 and chapters 19.27A and 19.27 RCW. WSR 22-14-091, 23-12-101, and 23-20-021, § 51-11C-403327, filed 7/1/22, 6/7/23, and 9/25/23, effective 3/15/24.

Wash. Admin. Code § 51-11C-403328 Table C403.3.2(8)—Electrically operated variable refrigerant flow air conditioners—Minimum efficiency requirements.

Table C403.3.2(8)

Electrically Operated Variable Refrigerant Flow Air Conditioners—Minimum Efficiency Requirementsb

| Equipment Type | Size Category | Heating Section Type | Subcategory or Rating Condition | Minimum Efficiency | Test Procedurea | | --- | --- | --- | --- | --- | --- | | | < 65,000 Btu/h | All | VRF Multi-Split System | 13.0 SEER | | | VRF Air Conditioners, Air Cooled | ≥ 65,000 Btu/h and < 135,000 Btu/h | Electric Resistance (or none) | VRF Multi-Split System | 11.2 EER 15.5 IEER | AHRI 1230 | | | ≥ 135,000 Btu/h and < 240,000 Btu/h | Electric Resistance (or none) | VRF Multi-Split System | 11.0 EER 14.9 IEER | | | | ≥ 240,000 Btu/h | Electric Resistance (or none) | VRF Multi-Split System | 10.0 EER 13.9 IEER | |

| For SI: 1 British thermal unit per hour = 0.2931 W. | | | --- | --- | | a | Chapter 6 contains a complete specification of the referenced standards, which include test procedures, including the reference year version of the test procedure. | | b | This table is a replica of ASHRAE 90.1 Table 6.8.1-8 Electrically Operated Variable-Refrigerant-Flow Air Conditioners—Minimum Efficiency Requirements. |

History

• Statutory Authority: RCW 19.27A.020, 19.27A.025, 19.27A.160 and chapters 19.27A and 19.27 RCW. WSR 22-14-091, 23-12-101, and 23-20-021, § 51-11C-403328, filed 7/1/22, 6/7/23, and 9/25/23, effective 3/15/24.

Wash. Admin. Code § 51-11C-403329 Tables C403.3.2(9) through C403.3.2(16)—HVAC equipment minimum efficiency requirements.

Table C403.3.2(9)

Electrically Operated Variable Refrigerant Flow Air-to-Air and Applied Heat Pumps—Minimum Efficiency Requirementsb

| Equipment Type | Size Category | Heating Section Type | Subcategory or Rating Condition | Minimum Efficiency | Test Procedurea | | --- | --- | --- | --- | --- | --- | | | < 65,000 Btu/h | All | VRF Multi-Split System | 13.0 SEER | | | | ≥ 65,000 Btu/h and < 135,000 Btu/h | Electric Resistance (or none) | VRF Multi-Split System | 11.0 EER 14.6 IEER | | | | ≥ 65,000 Btu/h and < 135,000 Btu/h | Electric Resistance (or none) | VRF Multi-Split System with Heat Recovery | 10.8 EER 14.4 IEER | | | VRF Air Cooled (cooling mode) | ≥ 135,000 Btu/h and < 240,000 Btu/h | Electric Resistance (or none) | VRF Multi-Split System | 10.6 EER 13.9 IEER | AHRI 1230 | | | ≥ 135,000 Btu/h and < 240,000 Btu/h | Electric Resistance (or none) | VRF Multi-Split System with Heat Recovery | 10.4 EER 13.7 IEER | | | | ≥ 240,000 Btu/h | Electric Resistance (or none) | VRF Multi-Split System | 9.5 EER 12.7 IEER | | | | ≥ 240,000 Btu/h | Electric Resistance (or none) | VRF Multi-Split System with Heat Recovery | 9.3 EER 12.5 IEER | | | | < 65,000 Btu/h | All | VRF Multi-Split System 86ºF entering water | 12.0 EER 16.0 IEER | | | | < 65,000 Btu/h | All | VRF Multi-Split System with Heat Recovery 86ºF entering water | 11.8 EER 15.8 IEER | | | | ≥ 65,000 Btu/h and < 135,000 Btu/h | All | VRF Multi-Split System 86ºF entering water | 12.0 EER 16.0 IEER | | | VRF Water Source (cooling mode) | ≥ 65,000 Btu/h and < 135,000 Btu/h | All | VRF Multi-Split System with Heat Recovery 86ºF entering water | 11.8 EER 15.8 IEER | AHRI 1230 | | | ≥ 135,000 Btu/h and < 240,000 Btu/h | All | VRF Multi-Split System 86ºF entering water | 10.0 EER 14.0 IEER | | | | ≥ 135,000 Btu/h and < 240,000 Btu/h | All | VRF Multi-Split System with Heat Recovery 86ºF entering water | 9.8 EER 13.8 IEER | | | | ≥ 240,000 Btu/h | All | VRF Multi-Split System 86ºF entering water | 10.0 EER 12.0 IEER | | | | ≥ 240,000 Btu/h | All | VRF Multi-Split System with Heat Recovery 86ºF entering water | 9.8 EER 11.8 IEER | | | | < 135,000 Btu/h | All | VRF Multi-Split System 59ºF entering water | 16.2 EER | | | < 135,000 Btu/h | All | VRF Multi-Split System with Heat Recovery 59ºF entering water | 16.0 EER | | | | VRF Groundwater Source (cooling mode) | ≥ 135,000 Btu/h | All | VRF Multi-Split System 59ºF entering water | 13.8 EER | AHRI 1230 | | | ≥ 135,000 Btu/h | All | VRF Multi-Split System with Heat Recovery 59ºF entering water | 13.6 EER | | | | < 135,000 Btu/h | All | VRF Multi-Split System 77ºF entering water | 13.4 EER | | | VRF Ground Source (cooling mode) | < 135,000 Btu/h | All | VRF Multi-Split System with Heat Recovery 77ºF entering water | 13.2 EER | AHRI 1230 | | | ≥ 135,000 Btu/h | All | VRF Multi-Split System 77ºF entering water | 11.0 EER | | | | ≥ 135,000 Btu/h | All | VRF Multi-Split System with Heat Recovery 77ºF entering water | 10.8 EER | | | | < 65,000 Btu/h (cooling capacity) | | VRF Multi-Split System | 7.7 HSPF | | | VRF Air Cooled (heating mode) | ≥ 65,000 Btu/h and < 135,000 Btu/h (cooling capacity) | | VRF Multi-Split System 47ºF db/43ºF wb outdoor air 17ºF db/15ºF wb outdoor air | 3.3 COP 2.25 COP | AHRI 1230 | | | ≥ 135,000 Btu/h (cooling capacity) | | VRF Multi-Split System 47ºF db/43ºF wb outdoor air 17ºF db/15ºF wb outdoor air | 3.2 COP 2.05 COP | | | | < 65,000 Btu/h (cooling capacity) | | VRF Multi-Split System 68ºF entering water | 4.3 COP | | | | ≥ 65,000 Btu/h and < 135,000 Btu/h (cooling capacity) | | VRF Multi-Split System 68ºF entering water | 4.3 COP | | | VRF Water Source (heating mode) | ≥ 135,000 Btu/h and < 240,000 Btu/h (cooling capacity) | | VRF Multi-Split System 68ºF entering water | 4.0 COP | AHRI 1230 | | | ≥ 240,000 Btu/h (cooling capacity) | | VRF Multi-Split System 68ºF entering water | 3.9 COP | | | VRF Groundwater Source | < 135,000 Btu/h (cooling capacity) | | VRF Multi-Split System 50ºF entering water | 3.6 COP | AHRI 1230 | | (heating mode) | ≥ 135,000 Btu/h (cooling capacity) | | VRF Multi-Split System 50ºF entering water | 3.3 COP | | | VRF Ground Source | < 135,000 Btu/h (cooling capacity) | | VRF Multi-Split System 32ºF entering water | 3.1 COP | AHRI 1230 | | (heating mode) | ≥ 135,000 Btu/h (cooling capacity) | | VRF Multi-Split System 32ºF entering water | 2.8 COP | |

| For SI: °C = [(°F) - 32]/1.8, 1 British thermal unit per hour = 0.2931 W, db = dry bulb temperature, wb = wet bulb temperature. | | | --- | --- | | a | Chapter 6 contains a complete specification of the referenced standards, which include test procedures, including the reference year version of the test procedure. | | b | This table is a replica of ASHRAE 90.1 Table 6.8.1-9 Electrically Operated Variable-Refrigerant-Flow and Applied Heat Pumps—Minimum Efficiency Requirements. |

Table C403.3.2(10)

Floor-Mounted Air Conditioners and Condensing Units Serving Computer Rooms—Minimum Efficiency Requirementsb

| Equipment Type | Standard Model | Net Sensible Cooling Capacity | Minimum Net Sensible COP | Rating Conditions Return Air (dry bulb/dew point) | Test Procedurea | | --- | --- | --- | --- | --- | --- | | Air cooled | Downflow | < 80,000 Btu/h | 2.70 | 85°F/52°F (Class 2) | AHRI 1360 | | ≥ 80,000 Btu/h and < 295,000 Btu/h | 2.58 | | | | | | ≥ 295,000 Btu/h | 2.36 | | | | | | Upflow - Ducted | < 80,000 Btu/h | 2.67 | | | | | ≥ 80,000 Btu/h and < 295,000 Btu/h | 2.55 | | | | | | ≥ 295,000 Btu/h | 2.33 | | | | | | | Upflow - Nonducted | ˃ 65,000 Btu/h | 2.16 | 75°F/52°F (Class 1) | | | ≥ 65,000 Btu/h and < 240,000 Btu/h | 2.04 | | | | | | ≥ 240,000 Btu/h | 1.89 | | | | | | Horizontal | ˃ 65,000 Btu/h | 2.65 | | | | | ≥ 65,000 Btu/h and < 240,000 Btu/h | 2.55 | 95°F/52°F (Class 3) | | | | | ≥ 240,000 Btu/h | 2.47 | | | | | | Air cooled with fluid economizer | Downflow | < 80,000 Btu/h | 2.70 | 85°F/52°F (Class 1) | AHRI 1360 | | ≥ 80,000 Btu/h and < 295,000 Btu/h | 2.58 | | | | | | ≥ 295,000 Btu/h | 2.36 | | | | | | Upflow - Ducted | < 80,000 Btu/h | 2.67 | | | | | ≥ 80,000 Btu/h and < 295,000 Btu/h | 2.55 | | | | | | ≥ 295,000 Btu/h | 2.33 | | | | | | | Upflow - Nonducted | ˃ 65,000 Btu/h | 2.09 | 75°F/52°F (Class 1) | | | ≥ 65,000 Btu/h and < 240,000 Btu/h | 1.99 | | | | | | ≥ 240,000 Btu/h | 1.81 | | | | | | Horizontal | ˃ 65,000 Btu/h | 2.65 | | | | | ≥ 65,000 Btu/h and < 240,000 Btu/h | 2.55 | 95°F/52°F (Class 3) | | | | | ≥ 240,000 Btu/h | 2.47 | | | | | | Water cooled | Downflow | < 80,000 Btu/h | 2.82 | 85°F/52°F (Class 1) | AHRI 1360 | | ≥ 80,000 Btu/h and < 295,000 Btu/h | 2.73 | | | | | | ≥ 295,000 Btu/h | 2.67 | | | | | | Upflow - Ducted | < 80,000 Btu/h | 2.79 | | | | | ≥ 80,000 Btu/h and < 295,000 Btu/h | 2.70 | | | | | | ≥ 295,000 Btu/h | 2.64 | | | | | | | Upflow - Nonducted | ˃ 65,000 Btu/h | 2.43 | 75°F/52°F (Class 1) | | | ≥ 65,000 Btu/h and < 240,000 Btu/h | 2.32 | | | | | | ≥ 240,000 Btu/h | 2.20 | | | | | | Horizontal | ˃ 65,000 Btu/h | 2.79 | | | | | ≥ 65,000 Btu/h and < 240,000 Btu/h | 2.68 | 95°F/52°F (Class 3) | | | | | ≥ 240,000 Btu/h | 2.60 | | | | | | Water cooled with fluid economizer | Downflow | < 80,000 Btu/h | 2.77 | 85°F/52°F (Class 1) | AHRI 1360 | | ≥ 80,000 Btu/h and < 295,000 Btu/h | 2.68 | | | | | | ≥ 295,000 Btu/h | 2.61 | | | | | | Upflow - Ducted | < 80,000 Btu/h | 2.74 | | | | | ≥ 80,000 Btu/h and < 295,000 Btu/h | 2.65 | | | | | | ≥ 295,000 Btu/h | 2.58 | | | | | | | Upflow - Nonducted | ˃ 65,000 Btu/h | 2.35 | 75°F/52°F (Class 1) | | | ≥ 65,000 Btu/h and < 240,000 Btu/h | 2.24 | | | | | | ≥ 240,000 Btu/h | 2.12 | | | | | | Horizontal | ˃ 65,000 Btu/h | 2.71 | | | | | ≥ 65,000 Btu/h and < 240,000 Btu/h | 2.60 | 95°F/52°F (Class 3) | | | | | ≥ 240,000 Btu/h | 2.54 | | | | | | Glycol cooled | Downflow | < 80,000 Btu/h | 2.56 | 85°F/52°F (Class 1) | AHRI 1360 | | ≥ 80,000 Btu/h and < 295,000 Btu/h | 2.24 | | | | | | ≥ 295,000 Btu/h | 2.21 | | | | | | Upflow - Ducted | < 80,000 Btu/h | 2.53 | | | | | ≥ 80,000 Btu/h and < 295,000 Btu/h | 2.21 | | | | | | ≥ 295,000 Btu/h | 2.18 | | | | | | | Upflow - Nonducted | ˃ 65,000 Btu/h | 2.08 | 75°F/52°F (Class 1) | | | ≥ 65,000 Btu/h and < 240,000 Btu/h | 1.90 | | | | | | ≥ 240,000 Btu/h | 1.81 | | | | | | Horizontal | ˃ 65,000 Btu/h | 2.48 | | | | | ≥ 65,000 Btu/h and < 240,000 Btu/h | 2.18 | 95°F/52°F (Class 3) | | | | | ≥ 240,000 Btu/h | 2.18 | | | | | | Glycol cooled with fluid economizer | Downflow | < 80,000 Btu/h | 2.51 | 85°F/52°F (Class 1) | AHRI 1360 | | ≥ 80,000 Btu/h and < 295,000 Btu/h | 2.19 | | | | | | ≥ 295,000 Btu/h | 2.15 | | | | | | Upflow - Ducted | < 80,000 Btu/h | 2.48 | | | | | ≥ 80,000 Btu/h and < 295,000 Btu/h | 2.16 | | | | | | ≥ 295,000 Btu/h | 2.12 | | | | | | | Upflow - Nonducted | ˃ 65,000 Btu/h | 2.00 | 75°F/52°F (Class 1) | | | ≥ 65,000 Btu/h and < 240,000 Btu/h | 1.82 | | | | | | ≥ 240,000 Btu/h | 1.73 | | | | | | Horizontal | ˃ 65,000 Btu/h | 2.44 | | | | | ≥ 65,000 Btu/h and < 240,000 Btu/h | 2.10 | 95°F/52°F (Class 3) | | | | | ≥ 240,000 Btu/h | 2.10 | | | | |

| For SI: 1 British thermal unit per hour = 0.2931 W, °C = [(°F) - 32]/1.8. | | | --- | --- | | a | Chapter 6 contains a complete specification of the referenced standards, which include test procedures, including the reference year version of the test procedure. | | b | This table is a replica of ASHRAE 90.1 Table 6.8.1-10 Floor-Mounted Air Conditioners and Condensing Units Serving Computer Rooms—Minimum Efficiency Requirements. |

Table C403.3.2(11)

Vapor-Compression-Based Indoor Pool Dehumidifiers—Minimum Efficiency Requirementsb

| Equipment Type | Subcategory or Rating Condition | Minimum Efficiency | Test Procedurea | | --- | --- | --- | --- | | Single package indoor (with or without economizer) | Rating Conditions: A or C | 3.5 MRE | AHRI 910 | | Single package indoor water cooled (with or without economizer) | Rating Conditions: A, B or C | 3.5 MRE | | | Single package indoor air cooled (with or without economizer) | Rating Conditions: A, B or C | 3.5 MRE | | | Split system indoor air cooled (with or without economizer) | Rating Conditions: A, B or C | 3.5 MRE | |

| a | Chapter 6 contains a complete specification of the referenced standards, which include test procedures, including the reference year version of the test procedure. | | --- | --- | | b | This table is a replica of ASHRAE 90.1 Table 6.8.1-11 Vapor-Compressor-Based Indoor Pool Dehumidifiers—Minimum Efficiency Requirements. |

Table C403.3.2(12)

Electrically Operated DX-DOAS Units, Single-Package and Remote Condenser, Without Energy Recovery—Minimum Efficiency Requirementsb

| Equipment Type | Subcategory or Rating Condition | Minimum Efficiency | Test Procedurea | | --- | --- | --- | --- | | Air cooled (dehumidification mode) | | 4.0 ISMRE | AHRI 920 | | Air source heat pumps (dehumidification mode) | | 4.0 ISMRE | AHRI 920 | | Water cooled (dehumidification mode) | Cooling tower condenser water | 4.9 ISMRE | AHRI 920 | | Chilled water | 6.0 ISMRE | | | | Air source heat pump (heating mode) | | 2.7 ISCOP | AHRI 920 | | Water source heat pump (dehumidification mode) | Ground source, closed loop | 4.8 ISMRE | AHRI 920 | | Ground-water source | 5.0 ISMRE | | | | Water source | 4.0 ISMRE | | | | Water source heat pump (heating mode) | Ground source, closed loop | 2.0 ISCOP | AHRI 920 | | Ground-water source | 3.2 ISCOP | | | | Water source | 3.5 ISCOP | | |

| a | Chapter 6 contains a complete specification of the referenced standards, which include test procedures, including the reference year version of the test procedure. | | --- | --- | | b | This table is a replica of ASHRAE 90.1 Table 6.8.1-13 Electrically Operated DX-DOAS Units, Single-Package and Remote Condenser, without Energy Recovery—Minimum Efficiency Requirements. |

Table C403.3.2(13)

Electrically Operated DX-DOAS Units, Single-Package and Remote Condenser, with Energy Recovery—Minimum Efficiency Requirementsb

| Equipment Type | Subcategory or Rating Condition | Minimum Efficiency | Test Procedurea | | --- | --- | --- | --- | | Air cooled (dehumidification mode) | | 5.2 ISMRE | AHRI 920 | | Air source heat pumps (dehumidification mode) | | 5.2 ISMRE | AHRI 920 | | Water cooled (dehumidification mode) | Cooling tower condenser water | 5.3 ISMRE | AHRI 920 | | Chilled water | 6.6 ISMRE | | | | Air source heat pump (heating mode) | | 3.3 ISCOP | AHRI 920 | | Water source heat pump (dehumidification mode) | Ground source, closed loop | 5.2 ISMRE | AHRI 920 | | Ground-water source | 5.8 ISMRE | | | | Water source | 4.8 ISMRE | | | | Water source heat pump (heating mode) | Ground source, closed loop | 3.8 ISCOP | AHRI 920 | | Ground-water source | 4.0 ISCOP | | | | Water source | 4.8 ISCOP | | |

| a | Chapter 6 contains a complete specification of the referenced standards, which include test procedures, including the reference year version of the test procedure. | | --- | --- | | b | This table is a replica of ASHRAE 90.1 Table 6.8.1-14 Electrically Operated DX-DOAS Units, Single-Package and Remote Condenser, with Energy Recovery—Minimum Efficiency Requirements. |

Table C403.3.2(14)

Electrically Water Source Heat Pumps—Minimum Efficiency Requirementsc

| Equipment Type | Size Categoryb | Heating Section Type | Subcategory or Rating Condition | Minimum Efficiency | Test Procedurea | | --- | --- | --- | --- | --- | --- | | | < 17,000 Btu/h | All | 86°F entering water | 12.2 EER | | | Water to air, water loop (cooling mode) | ≥ 17,000 Btu/h and < 65,000 Btu/h | All | 86°F entering water | 13.0 EER | ISO 13256-1 | | | ≥ 65,000 Btu/h and < 135,000 Btu/h | All | 86°F entering water | 13.0 EER | | | Water to air, ground water (cooling mode) | < 135,000 Btu/h | All | 59°F entering water | 18.0 EER | | | Brine to air, ground loop (cooling mode) | < 135,000 Btu/h | All | 77°F entering water | 14.1 EER | | | Water to water, water loop (cooling mode) | < 135,000 Btu/h | All | 86°F entering water | 10.6 EER | | | Water to water, ground water (cooling mode) | < 135,000 Btu/h | All | 59°F entering water | 16.3 EER | ISO 13256-2 | | Brine to water, ground loop (cooling mode) | < 135,000 Btu/h | All | 77°F entering fluid | 12.1 EER | | | Water to air, water loop (heating mode) | < 135,000 Btu/h (cooling capacity) | | 68°F entering water | 4.3 COPH | | | Water to air, ground water (heating mode) | < 135,000 Btu/h (cooling capacity) | | 50°F entering water | 3.7 COPH | ISO 13256-1 | | Brine to air, ground loop (heating mode) | < 135,000 Btu/h (cooling capacity) | | 32°F entering fluid | 3.2 COPH | | | Water to water, water loop (heating mode) | < 135,000 Btu/h (cooling capacity) | | 68°F entering water | 3.7 COPH | ISO 13256-1 | | Water to water, ground water (heating mode) | < 135,000 Btu/h (cooling capacity) | | 50°F entering water | 3.1 COPH | ISO 13256-2 | | Brine to water, ground loop (heating mode) | < 135,000 Btu/h (cooling capacity) | | 32°F entering fluid | 2.5 COPH | ISO 13256-2 |

| For SI: 1 British thermal unit per hour = 0.2931 W, °C = [(°F) - 32]/1.8. | | | --- | --- | | a | Chapter 6 contains a complete specification of the referenced standards, which include test procedures, including the reference year version of the test procedure. | | b | Single-phase, U.S. air-cooled heat pumps less than 19 kW are regulated as consumer produces by DOE 10 C.F.R. 430. SCOPC, SCOP2C, SCOPH and SCOP2H values for single-phase products are set by the U.S. DOE. | | c | This table is a replica of ASHRAE 90.1 Table 6.8.1-15 Electrically Operated Water-Source Heat Pumps—Minimum Efficiency Requirements. |

Table C403.3.2(15)

Heat-Pump and Heat Recovery Chiller Packages—Minimum Efficiency Requirementsg,h,i,j,k

| | | --- |

| For SI: °C = [(°F) - 32]/1.8. | | | --- | --- | | a | Chapter 6 contains a complete specification of the referenced standards, which include test procedures, including the reference year version of the test procedure. | | b | Cooling-only rating conditions are standard rating conditions defined in AHRI 550/590, Table 1. | | c | Heating full-load rating conditions are at rating conditions defined in AHRI 550/590, Table 1. | | d | For water-cooled heat recovery chillers that have capabilities for heat rejection to a heat recovery condenser and a tower condenser, the COPHR applies to operation at full load with 100 percent heat recovery (no tower rejection). Units that only have capabilities for partial heat recovery shall meet the requirements of Table C403.3.2(3). | | e | Outdoor air entering dry-bulb (db) temperature and wet-bulb (wb) temperature. | | f | Source-water entering and leaving water temperature. | | g | This table is a replica of ASHRAE 90.1 Table 6.8.1-16 Heat-Pump and Heat Recovery Chiller Packages—Minimum Efficiency Requirements. | | h | AHRI ratings are not required for equipment sizes larger than those covered by the test standard. | | i | Air-to-water heat pumps that are configured to operate only in heating and not in cooling only need to comply with the minimum heating efficiencies. | | j | Units that are both an air-to-water heat pump and a heat recovery chiller are required to comply with either the applicable air source efficiency requirements or the heat recovery chiller requirements but not both. | | k | Heat pumps and heat recovery chillers are only required to comply with one of the four leaving heating water temperature criteria. The leaving heater water temperature criteria that are closest to the design leaving water temperature shall be utilized. |

Table C403.3.2(16)

Ceiling-Mounted Computer-Room Air Conditioners—Minimum Efficiency Requirementsb

| Equipment Type | Standard Model | Net Sensible Cooling Capacity | Minimum Net Sensible COP | Rating Conditions Return Air (dry-bulb/dew point) | Test Procedurea | | --- | --- | --- | --- | --- | --- | | Air cooled with free air discharge condenser | Ducted | < 29,000 Btu/h | 2.05 | 75°F/52°F (Class 1) | AHRI 1360 | | ≥ 29,000 Btu/h and < 65,000 Btu/h | 2.02 | | | | | | ≥ 65,000 Btu/h | 1.92 | | | | | | Nonducted | < 29,000 Btu/h | 2.08 | | | | | ≥ 29,000 Btu/h and < 65,000 Btu/h | 2.05 | | | | | | ≥ 65,000 Btu/h | 1.94 | | | | | | Air cooled with free air discharge condenser with fluid economizer | Ducted | < 29,000 Btu/h | 2.01 | 75°F/52°F (Class 1) | AHRI 1360 | | ≥ 29,000 Btu/h and < 65,000 Btu/h | 1.97 | | | | | | ≥ 65,000 Btu/h | 1.87 | | | | | | Nonducted | < 29,000 Btu/h | 2.04 | | | | | ≥ 29,000 Btu/h and < 65,000 Btu/h | 2.00 | | | | | | ≥ 65,000 Btu/h | 1.89 | | | | | | Air cooled with ducted condenser | Ducted | < 29,000 Btu/h | 1.86 | 75°F/52°F (Class 1) | AHRI 1360 | | ≥ 29,000 Btu/h and < 65,000 Btu/h | 1.83 | | | | | | ≥ 65,000 Btu/h | 1.73 | | | | | | Nonducted | < 29,000 Btu/h | 1.89 | | | | | ≥ 29,000 Btu/h and < 65,000 Btu/h | 1.86 | | | | | | ≥ 65,000 Btu/h | 1.75 | | | | | | Air cooled with fluid economizer and ducted condenser | Ducted | < 29,000 Btu/h | 1.82 | 75°F/52°F (Class 1) | AHRI 1360 | | ≥ 29,000 Btu/h and < 65,000 Btu/h | 1.78 | | | | | | ≥ 65,000 Btu/h | 1.68 | | | | | | Nonducted | < 29,000 Btu/h | 1.85 | | | | | ≥ 29,000 Btu/h and < 65,000 Btu/h | 1.81 | | | | | | ≥ 65,000 Btu/h | 1.70 | | | | | | Water cooled | Ducted | < 29,000 Btu/h | 2.38 | 75°F/52°F (Class 1) | AHRI 1360 | | ≥ 29,000 Btu/h and < 65,000 Btu/h | 2.28 | | | | | | ≥ 65,000 Btu/h | 2.18 | | | | | | Nonducted | < 29,000 Btu/h | 2.41 | | | | | ≥ 29,000 Btu/h and < 65,000 Btu/h | 2.31 | | | | | | ≥ 65,000 Btu/h | 2.20 | | | | | | Water cooled with fluid economizer | Ducted | < 29,000 Btu/h | 2.33 | 75°F/52°F (Class 1) | AHRI 1360 | | ≥ 29,000 Btu/h and < 65,000 Btu/h | 2.23 | | | | | | ≥ 65,000 Btu/h | 2.13 | | | | | | Nonducted | < 29,000 Btu/h | 2.36 | | | | | ≥ 29,000 Btu/h and < 65,000 Btu/h | 2.26 | | | | | | ≥ 65,000 Btu/h | 2.16 | | | | | | Glycol cooled | Ducted | < 29,000 Btu/h | 1.97 | 75°F/52°F (Class 1) | AHRI 1360 | | ≥ 29,000 Btu/h and < 65,000 Btu/h | 1.93 | | | | | | ≥ 65,000 Btu/h | 1.78 | | | | | | Nonducted | < 29,000 Btu/h | 2.00 | | | | | ≥ 29,000 Btu/h and < 65,000 Btu/h | 1.98 | | | | | | ≥ 65,000 Btu/h | 1.81 | | | | | | Glycol cooled with fluid economizer | Ducted | < 29,000 Btu/h | 1.92 | 75°F/52°F (Class 1) | AHRI 1360 | | ≥ 29,000 Btu/h and < 65,000 Btu/h | 1.88 | | | | | | ≥ 65,000 Btu/h | 1.73 | | | | | | Nonducted | < 29,000 Btu/h | 1.95 | | | | | ≥ 29,000 Btu/h and < 65,000 Btu/h | 1.93 | | | | | | ≥ 65,000 Btu/h | 1.76 | | | | |

| For SI: 1 British thermal unit per hour = 0.2931 W, °C = [(°F) – 32]/1.8, COP = (Btu/h × hp)(2,550.7). | | | --- | --- | | a | Chapter 6 contains a complete specification of the referenced standards, which include test procedures, including the reference year version of the test procedure. | | b | This table is a replica of ASHRAE 90.1 Table 6.8.1-17 Ceiling-Mounted Computer-Room Air Conditioners—Minimum Efficiency Requirements. |

History

• (°F) - 32]/1.8, 1 British thermal unit per hour = 0.2931 W, db = dry bulb temperature, wb = wet bulb temperature.aChapter 6 contains a complete specification of the referenced standards, which include test procedures, including the reference year version of the test procedure.bThis table is a replica of ASHRAE 90.1 Table 6.8.1-9 Electrically Operated Variable-Refrigerant-Flow and Applied Heat Pumps—Minimum Efficiency Requirements.Table C403.3.2(10)Floor-Mounted Air Conditioners and Condensing Units Serving Computer Rooms—Minimum Efficiency RequirementsbEquipment TypeStandard ModelNet Sensible Cooling CapacityMinimum Net Sensible COPRating Conditions Return Air (dry bulb/dew point)Test ProcedureaAir cooledDownflow< 80,000 Btu/h2.7085°F/52°F (Class 2)AHRI 1360≥ 80,000 Btu/h and < 295,000 Btu/h2.58≥ 295,000 Btu/h2.36Upflow - Ducted< 80,000 Btu/h2.67≥ 80,000 Btu/h and < 295,000 Btu/h2.55≥ 295,000 Btu/h2.33 Upflow - Nonducted˃ 65,000 Btu/h2.1675°F/52°F (Class 1) ≥ 65,000 Btu/h and < 240,000 Btu/h2.04≥ 240,000 Btu/h1.89Horizontal˃ 65,000 Btu/h2.65 ≥ 65,000 Btu/h and < 240,000 Btu/h2.5595°F/52°F (Class 3)≥ 240,000 Btu/h2.47 Air cooled with fluid economizerDownflow< 80,000 Btu/h2.7085°F/52°F (Class 1)AHRI 1360≥ 80,000 Btu/h and < 295,000 Btu/h2.58≥ 295,000 Btu/h2.36Upflow - Ducted< 80,000 Btu/h2.67≥ 80,000 Btu/h and < 295,000 Btu/h2.55≥ 295,000 Btu/h2.33 Upflow - Nonducted˃ 65,000 Btu/h2.0975°F/52°F (Class 1) ≥ 65,000 Btu/h and < 240,000 Btu/h1.99≥ 240,000 Btu/h1.81Horizontal˃ 65,000 Btu/h2.65 ≥ 65,000 Btu/h and < 240,000 Btu/h2.5595°F/52°F (Class 3)≥ 240,000 Btu/h2.47 Water cooledDownflow< 80,000 Btu/h2.8285°F/52°F (Class 1)AHRI 1360≥ 80,000 Btu/h and < 295,000 Btu/h2.73≥ 295,000 Btu/h2.67Upflow - Ducted< 80,000 Btu/h2.79≥ 80,000 Btu/h and < 295,000 Btu/h2.70≥ 295,000 Btu/h2.64 Upflow - Nonducted˃ 65,000 Btu/h2.4375°F/52°F (Class 1) ≥ 65,000 Btu/h and < 240,000 Btu/h2.32≥ 240,000 Btu/h2.20Horizontal˃ 65,000 Btu/h2.79 ≥ 65,000 Btu/h and < 240,000 Btu/h2.6895°F/52°F (Class 3)≥ 240,000 Btu/h2.60 Water cooled with fluid economizerDownflow< 80,000 Btu/h2.7785°F/52°F (Class 1)AHRI 1360≥ 80,000 Btu/h and < 295,000 Btu/h2.68≥ 295,000 Btu/h2.61Upflow - Ducted< 80,000 Btu/h2.74≥ 80,000 Btu/h and < 295,000 Btu/h2.65≥ 295,000 Btu/h2.58 Upflow - Nonducted˃ 65,000 Btu/h2.3575°F/52°F (Class 1) ≥ 65,000 Btu/h and < 240,000 Btu/h2.24≥ 240,000 Btu/h2.12Horizontal˃ 65,000 Btu/h2.71 ≥ 65,000 Btu/h and < 240,000 Btu/h2.6095°F/52°F (Class 3)≥ 240,000 Btu/h2.54 Glycol cooledDownflow< 80,000 Btu/h2.5685°F/52°F (Class 1)AHRI 1360≥ 80,000 Btu/h and < 295,000 Btu/h2.24≥ 295,000 Btu/h2.21Upflow - Ducted< 80,000 Btu/h2.53≥ 80,000 Btu/h and < 295,000 Btu/h2.21≥ 295,000 Btu/h2.18 Upflow - Nonducted˃ 65,000 Btu/h2.0875°F/52°F (Class 1) ≥ 65,000 Btu/h and < 240,000 Btu/h1.90≥ 240,000 Btu/h1.81Horizontal˃ 65,000 Btu/h2.48 ≥ 65,000 Btu/h and < 240,000 Btu/h2.1895°F/52°F (Class 3)≥ 240,000 Btu/h2.18 Glycol cooled with fluid economizerDownflow< 80,000 Btu/h2.5185°F/52°F (Class 1)AHRI 1360≥ 80,000 Btu/h and < 295,000 Btu/h2.19≥ 295,000 Btu/h2.15Upflow - Ducted< 80,000 Btu/h2.48≥ 80,000 Btu/h and < 295,000 Btu/h2.16≥ 295,000 Btu/h2.12 Upflow - Nonducted˃ 65,000 Btu/h2.0075°F/52°F (Class 1) ≥ 65,000 Btu/h and < 240,000 Btu/h1.82≥ 240,000 Btu/h1.73Horizontal˃ 65,000 Btu/h2.44 ≥ 65,000 Btu/h and < 240,000 Btu/h2.1095°F/52°F (Class 3)≥ 240,000 Btu/h2.10 For SI: 1 British thermal unit per hour = 0.2931 W, °C = [(°F) - 32]/1.8.aChapter 6 contains a complete specification of the referenced standards, which include test procedures, including the reference year version of the test procedure.bThis table is a replica of ASHRAE 90.1 Table 6.8.1-10 Floor-Mounted Air Conditioners and Condensing Units Serving Computer Rooms—Minimum Efficiency Requirements.Table C403.3.2(11)Vapor-Compression-Based Indoor Pool Dehumidifiers—Minimum Efficiency RequirementsbEquipment TypeSubcategory or Rating ConditionMinimum EfficiencyTest ProcedureaSingle package indoor (with or without economizer)Rating Conditions: A or C3.5 MREAHRI 910Single package indoor water cooled (with or without economizer)Rating Conditions: A, B or C3.5 MRESingle package indoor air cooled (with or without economizer)Rating Conditions: A, B or C3.5 MRESplit system indoor air cooled (with or without economizer)Rating Conditions: A, B or C3.5 MREaChapter 6 contains a complete specification of the referenced standards, which include test procedures, including the reference year version of the test procedure.bThis table is a replica of ASHRAE 90.1 Table 6.8.1-11 Vapor-Compressor-Based Indoor Pool Dehumidifiers—Minimum Efficiency Requirements.Table C403.3.2(12)Electrically Operated DX-DOAS Units, Single-Package and Remote Condenser, Without Energy Recovery—Minimum Efficiency RequirementsbEquipment TypeSubcategory or Rating ConditionMinimum EfficiencyTest ProcedureaAir cooled(dehumidification mode) 4.0 ISMREAHRI 920Air source heat pumps(dehumidification mode) 4.0 ISMREAHRI 920Water cooled(dehumidification mode)Cooling tower condenser water4.9 ISMREAHRI 920Chilled water6.0 ISMREAir source heat pump(heating mode) 2.7 ISCOPAHRI 920Water source heat pump(dehumidification mode)Ground source, closed loop4.8 ISMREAHRI 920Ground-water source5.0 ISMREWater source4.0 ISMREWater source heat pump(heating mode)Ground source, closed loop2.0 ISCOPAHRI 920Ground-water source3.2 ISCOPWater source3.5 ISCOPaChapter 6 contains a complete specification of the referenced standards, which include test procedures, including the reference year version of the test procedure.bThis table is a replica of ASHRAE 90.1 Table 6.8.1-13 Electrically Operated DX-DOAS Units, Single-Package and Remote Condenser, without Energy Recovery—Minimum Efficiency Requirements.Table C403.3.2(13)Electrically Operated DX-DOAS Units, Single-Package and Remote Condenser, with Energy Recovery—Minimum Efficiency RequirementsbEquipment TypeSubcategory or Rating ConditionMinimum EfficiencyTest ProcedureaAir cooled(dehumidification mode) 5.2 ISMREAHRI 920Air source heat pumps(dehumidification mode) 5.2 ISMREAHRI 920Water cooled(dehumidification mode)Cooling tower condenser water5.3 ISMREAHRI 920Chilled water6.6 ISMREAir source heat pump(heating mode) 3.3 ISCOPAHRI 920Water source heat pump(dehumidification mode)Ground source, closed loop5.2 ISMREAHRI 920Ground-water source5.8 ISMREWater source4.8 ISMREWater source heat pump(heating mode)Ground source, closed loop3.8 ISCOPAHRI 920Ground-water source4.0 ISCOPWater source4.8 ISCOPaChapter 6 contains a complete specification of the referenced standards, which include test procedures, including the reference year version of the test procedure.bThis table is a replica of ASHRAE 90.1 Table 6.8.1-14 Electrically Operated DX-DOAS Units, Single-Package and Remote Condenser, with Energy Recovery—Minimum Efficiency Requirements.Table C403.3.2(14)Electrically Water Source Heat Pumps—Minimum Efficiency RequirementscEquipment TypeSize CategorybHeating Section TypeSubcategory orRating ConditionMinimumEfficiencyTest Procedurea < 17,000 Btu/hAll86°F entering water12.2 EER Water to air, water loop (cooling mode)≥ 17,000 Btu/h and< 65,000 Btu/hAll86°F entering water13.0 EERISO 13256-1 ≥ 65,000 Btu/h and< 135,000 Btu/hAll86°F entering water13.0 EER Water to air, ground water (cooling mode)< 135,000 Btu/hAll59°F entering water18.0 EER Brine to air, ground loop (cooling mode)< 135,000 Btu/hAll77°F entering water14.1 EER Water to water, water loop (cooling mode)< 135,000 Btu/hAll86°F entering water10.6 EER Water to water, ground water (cooling mode)< 135,000 Btu/hAll59°F entering water16.3 EERISO 13256-2Brine to water, ground loop (cooling mode)< 135,000 Btu/hAll77°F entering fluid12.1 EER Water to air, water loop (heating mode)< 135,000 Btu/h (cooling capacity) 68°F entering water4.3 COPH Water to air, ground water (heating mode)< 135,000 Btu/h (cooling capacity) 50°F entering water3.7 COPHISO 13256-1Brine to air, ground loop (heating mode)< 135,000 Btu/h (cooling capacity) 32°F entering fluid3.2 COPH Water to water, water loop (heating mode)< 135,000 Btu/h (cooling capacity) 68°F entering water3.7 COPHISO 13256-1Water to water, ground water (heating mode)< 135,000 Btu/h (cooling capacity) 50°F entering water3.1 COPHISO 13256-2Brine to water, ground loop (heating mode)< 135,000 Btu/h (cooling capacity) 32°F entering fluid2.5 COPHISO 13256-2For SI: 1 British thermal unit per hour = 0.2931 W, °C = [(°F) - 32]/1.8.aChapter 6 contains a complete specification of the referenced standards, which include test procedures, including the reference year version of the test procedure.bSingle-phase, U.S. air-cooled heat pumps less than 19 kW are regulated as consumer produces by DOE 10 C.F.R. 430. SCOPC, SCOP2C, SCOPH and SCOP2H values for single-phase products are set by the U.S. DOE.cThis table is a replica of ASHRAE 90.1 Table 6.8.1-15 Electrically Operated Water-Source Heat Pumps—Minimum Efficiency Requirements.Table C403.3.2(15)Heat-Pump and Heat Recovery Chiller Packages—Minimum Efficiency Requirementsg,h,i,j,kFor SI: °C = [(°F) - 32]/1.8.aChapter 6 contains a complete specification of the referenced standards, which include test procedures, including the reference year version of the test procedure.bCooling-only rating conditions are standard rating conditions defined in AHRI 550/590, Table 1.cHeating full-load rating conditions are at rating conditions defined in AHRI 550/590, Table 1.dFor water-cooled heat recovery chillers that have capabilities for heat rejection to a heat recovery condenser and a tower condenser, the COPHR applies to operation at full load with 100 percent heat recovery (no tower rejection). Units that only have capabilities for partial heat recovery shall meet the requirements of Table C403.3.2(3).eOutdoor air entering dry-bulb (db) temperature and wet-bulb (wb) temperature.fSource-water entering and leaving water temperature.gThis table is a replica of ASHRAE 90.1 Table 6.8.1-16 Heat-Pump and Heat Recovery Chiller Packages—Minimum Efficiency Requirements.hAHRI ratings are not required for equipment sizes larger than those covered by the test standard.iAir-to-water heat pumps that are configured to operate only in heating and not in cooling only need to comply with the minimum heating efficiencies.jUnits that are both an air-to-water heat pump and a heat recovery chiller are required to comply with either the applicable air source efficiency requirements or the heat recovery chiller requirements but not both.kHeat pumps and heat recovery chillers are only required to comply with one of the four leaving heating water temperature criteria. The leaving heater water temperature criteria that are closest to the design leaving water temperature shall be utilized.Table C403.3.2(16)Ceiling-Mounted Computer-Room Air Conditioners—Minimum Efficiency RequirementsbEquipment TypeStandard ModelNet Sensible Cooling CapacityMinimum Net Sensible COPRating Conditions Return Air (dry-bulb/dew point)Test ProcedureaAir cooled with free air discharge condenserDucted< 29,000 Btu/h2.0575°F/52°F (Class 1)AHRI 1360≥ 29,000 Btu/h and < 65,000 Btu/h2.02≥ 65,000 Btu/h1.92Nonducted< 29,000 Btu/h2.08≥ 29,000 Btu/h and < 65,000 Btu/h2.05≥ 65,000 Btu/h1.94Air cooled with free air discharge condenser with fluid economizerDucted< 29,000 Btu/h2.0175°F/52°F (Class 1)AHRI 1360≥ 29,000 Btu/h and < 65,000 Btu/h1.97≥ 65,000 Btu/h1.87Nonducted< 29,000 Btu/h2.04≥ 29,000 Btu/h and < 65,000 Btu/h2.00≥ 65,000 Btu/h1.89Air cooled with ducted condenserDucted< 29,000 Btu/h1.8675°F/52°F (Class 1)AHRI 1360≥ 29,000 Btu/h and < 65,000 Btu/h1.83≥ 65,000 Btu/h1.73Nonducted< 29,000 Btu/h1.89≥ 29,000 Btu/h and < 65,000 Btu/h1.86≥ 65,000 Btu/h1.75Air cooled with fluid economizer and ducted condenserDucted< 29,000 Btu/h1.8275°F/52°F (Class 1)AHRI 1360≥ 29,000 Btu/h and < 65,000 Btu/h1.78≥ 65,000 Btu/h1.68Nonducted< 29,000 Btu/h1.85≥ 29,000 Btu/h and < 65,000 Btu/h1.81≥ 65,000 Btu/h1.70Water cooledDucted< 29,000 Btu/h2.3875°F/52°F (Class 1)AHRI 1360≥ 29,000 Btu/h and < 65,000 Btu/h2.28≥ 65,000 Btu/h2.18Nonducted< 29,000 Btu/h2.41≥ 29,000 Btu/h and < 65,000 Btu/h2.31≥ 65,000 Btu/h2.20Water cooled with fluid economizerDucted< 29,000 Btu/h2.3375°F/52°F (Class 1)AHRI 1360≥ 29,000 Btu/h and < 65,000 Btu/h2.23≥ 65,000 Btu/h2.13Nonducted< 29,000 Btu/h2.36≥ 29,000 Btu/h and < 65,000 Btu/h2.26≥ 65,000 Btu/h2.16Glycol cooledDucted< 29,000 Btu/h1.9775°F/52°F (Class 1)AHRI 1360≥ 29,000 Btu/h and < 65,000 Btu/h1.93≥ 65,000 Btu/h1.78Nonducted< 29,000 Btu/h2.00≥ 29,000 Btu/h and < 65,000 Btu/h1.98≥ 65,000 Btu/h1.81Glycol cooled with fluid economizerDucted< 29,000 Btu/h1.9275°F/52°F (Class 1)AHRI 1360≥ 29,000 Btu/h and < 65,000 Btu/h1.88≥ 65,000 Btu/h1.73Nonducted< 29,000 Btu/h1.95≥ 29,000 Btu/h and < 65,000 Btu/h1.93≥ 65,000 Btu/h1.76For SI: 1 British thermal unit per hour = 0.2931 W, °C = [(°F) – 32]/1.8, COP = (Btu/h × hp)(2,550.7).aChapter 6 contains a complete specification of the referenced standards, which include test procedures, including the reference year version of the test procedure.bThis table is a replica of ASHRAE 90.1 Table 6.8.1-17 Ceiling-Mounted Computer-Room Air Conditioners—Minimum Efficiency Requirements.[Statutory Authority: RCW 19.27A.020, 19.27A.025, 19.27A.160 and chapters 19.27A and 19.27 RCW. WSR 22-14-091, 23-12-101, and 23-20-021, § 51-11C-403329, filed 7/1/22, 6/7/23, and 9/25/23, effective 3/15/24.

Wash. Admin. Code § 51-11C-40333 Section C403.3.3—Hot gas bypass.

C403.3.3 Hot gas bypass limitation. Cooling systems shall not use hot gas bypass or other evaporator pressure control systems unless the system is designed with multiple steps of unloading or continuous capacity modulation. The capacity of the hot gas bypass shall be limited as indicated in Table C403.3.3, as limited by Section C403.5.1.

Table C403.3.3

Maximum Hot Gas Bypass Capacity

| Rated Capacity | Maximum Hot Gas Bypass Capacity (% of total capacity) | | --- | --- | | ≤ 240,000 Btu/h | 50 | | ˃ 240,000 Btu/h | 25 |

| For SI: | 1 British thermal unit per hour = 0.2931 W. | | --- | --- |

History

• Statutory Authority: RCW 19.27A.025, 19.27A.045 and chapter 19.27 RCW. WSR 20-21-080, § 51-11C-40333, filed 10/19/20, effective 2/1/21. Statutory Authority: RCW 19.27A.020, 19.27A.025, 19.27A.160 and chapter 19.27 RCW. WSR 19-24-040, § 51-11C-40333, filed 11/26/19, effective 7/1/20. Statutory Authority: RCW 19.27A.025, 19.27A.160, and 19.27.074. WSR 16-03-072, § 51-11C-40333, filed 1/19/16, effective 7/1/16.

Wash. Admin. Code § 51-11C-40334 Section C403.3.4—Boilers.

C403.3.4Boiler requirements.Boiler systems shall comply with Sections C403.3.4.1 through C403.3.4.5.2.

C403.3.4.1 Combustion air positive shut-off. Combustion air positive shut-off shall be provided on all newly installed boiler systems as follows:

1. All boiler systems with an input capacity of 2,500,000 Btu/h and above, in which the boiler is designed to operate with a nonpositive vent static pressure.

2. All boiler systems where one stack serves two or more boilers with a total combined input capacity per stack of 2,500,000 Btu/h.

C403.3.4.2 Boiler system oxygen concentration controls. Boiler system combustion air fans with motors 10 horsepower or larger shall meet one of the following for newly installed boilers:

1. The fan motor shall be variable speed; or

2. The fan motor shall include controls that limit the fan motor demand to no more than 30 percent of the total design wattage at 50 percent of design air volume.

C403.3.4.3 Boiler oxygen concentration controls. Newly installed boilers with an input capacity of 5,000,000 Btu/h and greater and a steady state full-load combustion efficiency less than 90 percent shall maintain stack-gas oxygen concentrations not greater than the values specified in Table C403.3.4.3. Combustion air volume shall be controlled with respect to measured flue gas oxygen concentration. The use of a common gas and combustion air control linkage or jack shaft is prohibited.

| EXCEPTION: | These concentration limits do not apply where 50 percent or more of the boiler system capacity serves Group R-2 occupancies. | | --- | --- |

Table C403.3.4.3

Boiler Stack-Gas Oxygen Concentrations

| Boiler System Type | Maximum Stack-Gas Oxygen Concentrationa | | --- | --- | | Less than 10% of the boiler system capacity is used for process applications at design conditions | 5% | | All others | 3% |

| a | Concentration levels measured by volume on a dry basis over firing rates of 20 to 100 percent. | | --- | --- |

C403.3.4.4 Boiler turndown.Boiler systems with design input of greater than 1,000,000 Btu/h (293 kW) shall comply with the turndown ratio specified in Table C403.3.4.4.

The system turndown requirement shall be met through the use of multiple single input boilers, one or more modulating boilers or a combination of single input and modulating boilers.

Table C403.3.4.4

Boiler Turndown

| Boiler System Design Input (Btu/h) | Minimum Turndown Ratio | | --- | --- | | ≥ 1,000,000 and less than or equal to 5,000,000 | 3 to 1 | | ≥ 5,000,000 and less than or equal to 10,000,000 | 4 to 1 | | ≥ 10,000,000 | 5 to 1 |

C403.3.4.5 Buildings with high-capacity space-heating gas boiler systems. New buildings with gas hot water boiler systems for space heating with a total system input of at least 1,000,000 Btu/h but not more than 10,000,000 Btu/h shall comply with this section.

| EXCEPTIONS: | 1. Where 25 percent of the annual space heating requirement is provided by site-recovered energy, or heat recovery chillers. | | --- | --- | | | 2. Space heating boilers installed in individual dwelling units. | | | 3. Where 50 percent or more of the design heat load is served using perimeter convective heating, radiant ceiling panels, or both. | | | 4. Individual gas boilers with input capacity less than 300,000 Btu/h shall not be included in the calculations of the total system input or total system efficiency. |

C403.3.4.5.1 Boiler efficiency. Gas hot water boilers shall have a minimum thermal efficiency (Et) of 90 percent when rated in accordance with the test procedures in Table C403.3.2(6). Systems with multiple boilers are allowed to meet this requirement if the space-heating input provided by equipment with thermal efficiency (Et) above and below 90 percent provides an input capacity-weighted average thermal efficiency of at least 90 percent. For boilers rated only for combustion efficiency, the calculation for the input capacity-weighted average thermal efficiency shall use the combustion efficiency value.

C403.3.4.5.2 Hot water distribution system design. The hot water distribution system shall be designed to meet all of the following:

1. Coils and other heat exchangers shall be selected so that at design conditions the hot water return temperature entering the boilers is 120°F (48.9°C) or less.

2. Under all operating conditions, the water temperature entering the boiler is 120°F (48.9°C) or less, or the flow rate of supply hot water that recirculates directly into the return system, such as three-way valves or minimum flow bypass controls, shall be no greater than 20 percent of the design flow of the operating boilers.

History

• Statutory Authority: RCW 19.27A.045 and chapter 19.27A RCW. WSR 24-16-145, § 51-11C-40334, filed 8/7/24, effective 9/7/24. Statutory Authority: RCW 19.27A.020, 19.27A.025, 19.27A.160 and chapters 19.27A and 19.27 RCW. WSR 22-14-091, 23-12-101, and 23-20-021, § 51-11C-40334, filed 7/1/22, 6/7/23, and 9/25/23, effective 3/15/24. Statutory Authority: RCW 19.27A.020, 19.27A.025, 19.27A.160 and chapter 19.27 RCW. WSR 19-24-040, § 51-11C-40334, filed 11/26/19, effective 7/1/20. Statutory Authority: RCW 19.27A.025, 19.27A.160, and 19.27.074. WSR 16-03-072, § 51-11C-40334, filed 1/19/16, effective 7/1/16.

Wash. Admin. Code § 51-11C-40335 Section C403.3.5—Dedicated outdoor air systems.

C403.3.5 Dedicated outdoor air systems (DOAS). For buildings with occupancies as shown in Table C403.3.5, outdoor air shall be provided to each occupied space by a dedicated outdoor air system (DOAS) which delivers 100 percent outdoor air without requiring operation of the heating and cooling system fans for ventilation air delivery.

| EXCEPTIONS: | 1. Occupied spaces that are not ventilated by a mechanical ventilation system and are only ventilated by a natural ventilation system in accordance with Section 402 of the International Mechanical Code. | | --- | --- | | | 2. High efficiency variable air volume (VAV) systems complying with Section C403.6.10 for occupancy classifications other than Groups A-1, A-2 and A-3 as specified in Table C403.3.5, and high efficiency VAV systems complying with Section C403.12 for occupancy classification Groups A-1, A-2 and A-3 as specified in Table C403.3.5. This exception shall not be used as a substitution for a DOAS per Section C406.6. |

Table C403.3.5

Occupancy Classifications Requiring DOAS

| Occupancy Classificationa | Inclusions | Exempted | | --- | --- | --- | | A-1 | All occupancies not specifically exempted | Television and radio studios | | A-2 | Casinos (gaming area) | All other A-2 occupancies | | A-3 | Lecture halls, community halls, exhibition halls, gymnasiums, courtrooms, libraries, places of religious worship | All other A-3 occupancies | | A-4, A-5 | | All occupancies excluded | | B | All occupancies not specifically exempted | Food processing establishments including commercial kitchens, restaurants, cafeterias; laboratories for testing and research; data processing facilities and telephone exchanges; air traffic control towers; animal hospitals, kennels, pounds; ambulatory care facilities | | F, H, I, R, S, U | | All occupancies excluded | | E, M | All occupancies included | |

| a. | Occupancy classification from the International Building Code Chapter 3. | | --- | --- |

C403.3.5.1 DOAS with energy recovery ventilation. The DOAS shall include energy recovery. The energy recovery device shall have a 68 percent minimum sensible recovery effectiveness as calculated in accordance with Equation 4-9 or provide an enthalpy recovery ratio of not less than 60 percent at design conditions in accordance with Section C403.7.6. The airflow rate thresholds in Section C403.7.6 that define when the energy recovery requirements in that section do not apply, are not applicable to this section. The return/exhaust air stream temperature for heat recovery device selection shall be 70°F (21°C) at 30 percent relative humidity, or as calculated by the registered design professional.

(Equation 4-9)

| | Sensible Recovery Effectiveness | = | TOA - TSA | | | --- | --- | --- | --- | --- | | | TOA - TRA | | | |

| Where: | | | | | --- | --- | --- | --- | | | TOA | = | Design outdoor air dry bulb temperature entering the energy recovery device. | | | TSA | = | Supply air dry bulb temperature leaving the energy recovery device at design temperatures and airflow conditions, as selected for the proposed DOAS unit(s). | | | TRA | = | Design return air dry bulb temperature. |

| EXCEPTIONS: | 1. Systems installed for the sole purpose of providing makeup air for systems exhausting toxic, flammable, paint, or corrosive fumes or dust, dryer exhaust, or commercial kitchen hoods used for collecting and removing grease vapors and smoke. | | --- | --- | | | 2. Heat recovery and energy recovery ventilators (H/ERV) that are rated and listed in accordance with HVI 920 can demonstrate compliance with the sensible recovery effectiveness requirement using the adjusted sensible recovery effectiveness (ASRE) rating of the equipment at 32°F test conditions. Applied flow rate for ASRE rating shall be no less than the design flow rate or the closest value interpolated between two listed flow rates. | | | 3. The energy recovery systems for Group R-2 occupancies are permitted to provide 60 percent minimum sensible heat recovery effectiveness in lieu of 68 percent sensible recovery effectiveness in accordance with Section C403.7.6. The return/exhaust air stream temperature for heat recovery device selection shall be 70°F (21°C) or as determined by an approved calculation procedure. |

C403.3.5.2 DOAS fan power. For a DOAS that does not have at least one fan or fan array with fan electrical input power ≥ 1 kW, the total combined fan power shall not exceed 1 watt per cfm of outdoor air as calculated in accordance with Equation 4-10 using design maximum airflows and external static pressures. For a DOAS with at least one fan or fan array with fan electrical input power ≥ 1 kW, the DOAS shall comply with the fan power limitations of Section C403.8.1. DOAS total combined fan power shall include all supply, exhaust and other fans utilized for the purpose of ventilation. This fan power restriction applies to each DOAS in the permitted project, but does not include the fan power associated with the zonal heating and cooling equipment.

(Equation 4-10)

| | DOAS Total Combined Fan Power | | | | --- | --- | --- | --- |

| Where: | | | | | --- | --- | --- | --- | | | Fan bhp | = | Brake horsepower for each supply, exhaust and other fan in the system at design maximum airflow rate. | | | ƞm | = | Fan motor efficiency including all motor, drive and other losses for each fan in the system. | | | CFMsupply | = | Design maximum airflow rate of outdoor (supply) air. |

C403.3.5.3 Heating and cooling system fan controls. Heating and cooling equipment fans, heating and cooling circulation pumps, and terminal unit fans shall cycle off and terminal unit primary cooling air shall be shut off when there is no call for heating or cooling in the zone.

| EXCEPTION: | Fans used for heating and cooling using less than 0.12 watts per cfm may operate when space temperatures are within the setpoint deadband (Section C403.4.1.2) to provide destratification and air mixing in the space. | | --- | --- |

C403.3.5.4 Decoupled DOAS supply air. The DOAS supply air shall be delivered directly to the occupied space or downstream of the terminal heating and/or cooling coils.

| EXCEPTIONS: | 1. Active chilled beam systems. | | --- | --- | | | 2. Sensible only cooling terminal units with pressure independent variable airflow regulating devices limiting the DOAS supply air to the greater of latent load or minimum ventilation requirements. | | | 3. Terminal heating and/or cooling units that comply with the low fan power allowance requirements in the exception of Section C403.3.5.3. |

C403.3.5.5 Supplemental heating and cooling. Supply air stream heating in the DOAS system shall comply with Section C403.7.3. Cooling is permitted for dehumidification only. Cooling coil shall be sized to meet peak dehumidification requirement at design outdoor temperatures, and no larger. Cooling coil shall be controlled to maintain supply air relative humidity or zone relative humidity.

| EXCEPTION: | Heating permitted for defrost control shall be locked out when outside air temperatures are above 35°F (2°C). Supplemental heating for defrost shall modulate to 10 percent of the peak capacity, and shall be sized to prevent frost damage to the unit at design temperatures and provide supply air less than or equal to 55°F (13°C). | | --- | --- |

C403.3.5.6 Impracticality. Where the code official determines that full compliance with one or more of the requirements in Sections C403.3.5.1 through C403.3.5.5 is impractical, it is permissible to provide an approved alternate means of compliance that achieves a comparable level of energy efficiency as the requirement(s) deemed impractical. For the purposes of this section, impractical means that an HVAC system complying with all requirements in Section C403.3.5 cannot effectively be utilized due to an unusual use or configuration of the building.

History

• Statutory Authority: RCW 19.27A.045 and chapter 19.27A RCW. WSR 24-16-145, § 51-11C-40335, filed 8/7/24, effective 9/7/24. Statutory Authority: RCW 19.27A.020, 19.27A.025, 19.27A.160 and chapters 19.27A and 19.27 RCW. WSR 22-14-091, 23-12-101, and 23-20-021, § 51-11C-40335, filed 7/1/22, 6/7/23, and 9/25/23, effective 3/15/24. Statutory Authority: RCW 19.27A.025, 19.27A.045 and chapter 19.27 RCW. WSR 20-21-080, § 51-11C-40335, filed 10/19/20, effective 2/1/21. Statutory Authority: RCW 19.27A.020, 19.27A.025, 19.27A.160 and chapter 19.27 RCW. WSR 19-24-040, § 51-11C-40335, filed 11/26/19, effective 7/1/20.

Wash. Admin. Code § 51-11C-40336 Section C403.3.6—Ventilation for Group R-2 occupancy.

C403.3.6 Ventilation for Group R-2 occupancy. For all Group R-2 dwelling and sleeping units, a balanced ventilation system with a heat recovery system shall provide outdoor air directly to all habitable spaces. The heat recovery system shall have a 60 percent minimum sensible recovery effectiveness as calculated in accordance with Section C403.3.5.1. The ventilation system shall allow for the design flow rates to be tested and verified at each habitable space as part of the commissioning process in accordance with Section C408.2.2.

| EXCEPTION: | Heat recovery and energy recovery ventilators (H/ERV) that are rated and listed in accordance with HVI 920 can demonstrate compliance with the sensible recovery effectiveness requirement using the adjusted sensible recovery effectiveness (ASRE) rating of the equipment at 32°F test conditions. Applied flow rate for ASRE rating shall be no less than the design flow rate or the closest value interpolated between two listed flow rates. | | --- | --- |

History

• Statutory Authority: RCW 19.27A.020, 19.27A.025, 19.27A.160 and chapters 19.27A and 19.27 RCW. WSR 22-14-091, 23-12-101, and 23-20-021, § 51-11C-40336, filed 7/1/22, 6/7/23, and 9/25/23, effective 3/15/24. Statutory Authority: RCW 19.27A.020, 19.27A.025, 19.27A.160 and chapter 19.27 RCW. WSR 19-24-040, § 51-11C-40336, filed 11/26/19, effective 7/1/20.

Wash. Admin. Code § 51-11C-40337 Section C403.3.7—Hydronic system flow rate.

C403.3.7 Hydronic system flow rate. Chilled water and condenser water piping shall be designed such that the design flow rate in each pipe segment shall not exceed the values listed in Table C403.3.7 for the appropriate total annual hours of operation. Pipe sizes for systems that operate under variable flow conditions (e.g., modulating 2-way control valves at coils) and that contain variable speed pump motors are permitted to be selected from the "Variable Flow/Variable Speed" columns. All others shall be selected from the "Other" columns.

| EXCEPTION: | Design flow rates exceeding the values in Table C403.3.7 are permitted in specific sections of pipe if the pipe is not in the critical circuit at design conditions and is not predicted to be in the critical circuit during more than 30 percent of operating hours. | | --- | --- |

Table C403.3.7

Piping System Design Maximum Flow Rate in GPMa

| Pipe Size | ≤ 2000 hours/year | > 2000 and ≤ 4400 hours/year | > 4400 hours/year | | | | | --- | --- | --- | --- | --- | --- | --- | | (in) | Other | Variable Flow/ Variable Speed | Other | Variable Flow/ Variable Speed | Other | Variable Flow/ Variable Speed | | 2 1/2 | 120 | 180 | 85 | 130 | 68 | 110 | | 3 | 180 | 270 | 140 | 210 | 110 | 170 | | 4 | 350 | 530 | 260 | 400 | 210 | 320 | | 5 | 410 | 620 | 310 | 470 | 250 | 370 | | 6 | 740 | 1100 | 570 | 860 | 440 | 680 | | 8 | 1200 | 1800 | 900 | 1400 | 700 | 1100 | | 10 | 1800 | 2700 | 1300 | 2000 | 1000 | 1600 | | 12 | 2500 | 3800 | 1900 | 2900 | 1500 | 2300 | | Maximum velocity for pipes over 14 to 24 in. in size | 8.5 ft/s | 13.0 ft/s | 6.5 ft/s | 9.5 ft/s | 5.0 ft/s | 7.5 ft/s |

| a | There are no requirements for pipe sizes smaller than the minimum size or larger than the maximum size shown in the table. | | --- | --- |

History

• Statutory Authority: RCW 19.27A.020, 19.27A.025, 19.27A.160 and chapters 19.27A and 19.27 RCW. WSR 22-14-091, 23-12-101, and 23-20-021, § 51-11C-40337, filed 7/1/22, 6/7/23, and 9/25/23, effective 3/15/24.

Wash. Admin. Code § 51-11C-40338 Section C403.3.8—Hydronic coils.

C403.3.8 Hydronic coil selection. Hydronic coils shall comply with Sections C403.3.8.1 and C403.3.8.2.

| EXCEPTION: | Replacement coils within existing equipment. | | --- | --- |

C403.3.8.1 Chilled-water coil selection. Chilled-water cooling coils shall be selected to provide a 15°F or higher temperature difference between leaving and entering water temperatures and a minimum of 57°F leaving water temperature at design conditions.

| EXCEPTIONS: | 1. Chilled-water cooling coils that have an airside pressure drop exceeding 0.70 in. of water when rated at 500 fpm face velocity and dry conditions (no condensation). | | --- | --- | | | 2. Individual fan-cooling units with a design supply airflow rate ≤ 5000 cfm. | | | 3. Constant-air-volume systems. | | | 4. Coils selected at the maximum temperature difference allowed by the cooling plant equipment manufacturer's approved operating conditions. | | | 5. Passive coils (no mechanically supplied airflow). | | | 6. Coils with design entering chilled-water temperature ≥ 50°F (10°C). | | | 7. Coils with design entering air dry-bulb temperature ≤ 65°F (18°C). |

C403.3.8.2 Hot-water coil selection. Hot-water heating coils shall be selected to provide a maximum 20°F temperature difference between leaving and entering water temperatures and a maximum of 118°F (48°C) entering water temperature at design conditions.

| EXCEPTIONS: | 1. Hot-water heating systems which utilize heat pumps as the primary source. | | --- | --- | | | 2. Individual terminal fan units with a design supply airflow rate ≤ 1500 cfm are exempt from the 20°F maximum temperature difference between leaving and entering water temperature requirement. | | | 3. Passive coils (no mechanically supplied airflow). | | | 4. Coils with design leaving air temperature ≥ 95°F (35°C). |

History

• Statutory Authority: RCW 19.27A.020, 19.27A.025, 19.27A.160 and chapters 19.27A and 19.27 RCW. WSR 22-14-091, 23-12-101, and 23-20-021, § 51-11C-40338, filed 7/1/22, 6/7/23, and 9/25/23, effective 3/15/24.

Wash. Admin. Code § 51-11C-40340 Section C403.4—HVAC system controls.

C403.4 HVAC system controls. HVAC systems shall be provided with controls in accordance with Sections C403.4.1 through C403.4.12 and shall be capable of and configured to implement all required control functions in this code.

History

• Statutory Authority: RCW 19.27A.020, 19.27A.025, 19.27A.160 and chapters 19.27A and 19.27 RCW. WSR 22-14-091, 23-12-101, and 23-20-021, § 51-11C-40340, filed 7/1/22, 6/7/23, and 9/25/23, effective 3/15/24. Statutory Authority: RCW 19.27A.020, 19.27A.025, 19.27A.160 and chapter 19.27 RCW. WSR 19-24-040, § 51-11C-40340, filed 11/26/19, effective 7/1/20. Statutory Authority: RCW 19.27A.025, 19.27A.160, and 19.27.074. WSR 16-03-072, § 51-11C-40340, filed 1/19/16, effective 7/1/16. Statutory Authority: RCW 19.27A.020, 19.27A.025 and chapters 19.27 and 34.05 RCW. WSR 13-04-056, § 51-11C-40340, filed 2/1/13, effective 7/1/13.

Wash. Admin. Code § 51-11C-40341 Section C403.4.1—Thermostatic controls.

C403.4.1 Thermostatic controls. The supply of heating and cooling energy to each zone shall be controlled by individual thermostatic controls capable of responding to temperature within the zone. Controls in the same zone or in neighboring zones connected by openings larger than 10 percent of the floor area of either zone shall not allow for simultaneous heating and cooling. At a minimum, each floor of a building shall be considered as a separate zone. Controls on systems required to have economizers and serving single zones shall have multiple cooling stage capability and activate the economizer when appropriate as the first stage of cooling. See Section C403.5 for further economizer requirements. Where humidification or dehumidification or both is provided, at least one humidity control device shall be provided for each humidity control system.

| EXCEPTIONS: | 1. Independent perimeter systems that are designed to offset only building envelope heat losses or gains or both serving one or more perimeter zones also served by an interior system provided: | | --- | --- | | | 1.1. The perimeter system includes at least one thermostatic control zone for each building exposure having exterior walls facing only one orientation (within +/-45 degrees) (0.8 rad) for more than 50 contiguous feet (15,240 mm); | | | 1.2. The perimeter system heating and cooling supply is controlled by a thermostat located within the zones served by the system; and | | | 1.3. Controls are configured to prevent the perimeter system from operating in a different heating or cooling mode from the other equipment within the zones or from neighboring zones connected by openings larger than 10 percent of the floor area of either zone. | | | 2. Where an interior zone and a perimeter zone are open to each other with permanent openings larger than 10 percent of the floor area of either zone, cooling in the interior zone is permitted to operate at times when the perimeter zone is in heating and the interior zone temperature is at least 5°F (2.8°C) higher than the perimeter zone temperature. For the purposes of this exception, a permanent opening is an opening without doors or other operable closures. | | | 3. Dedicated outdoor air units that provide ventilation air, make-up air or replacement air for exhaust systems are permitted to be controlled based on supply air temperature. The supply air temperature shall be controlled to a maximum of 65°F (18.3°C) in heating and a minimum of 72°F (22°C) in cooling unless the supply air temperature is being reset based on the status of cooling or heating in the zones served or it being reset based on outdoor air temperature. |

C403.4.1.1 Heat pump supplementary heat control. Heat pumps equipped with internal electric resistance heaters shall have controls that prevent supplemental heater operation when the heating load can be met by the heat pump alone during both steady-state operation and setback recovery. Supplemental heater operation is permitted during outdoor coil defrost cycles. Heat pumps equipped with supplemental heaters shall comply with all conditions of Section C403.1.4.

| EXCEPTIONS: | 1. Packaged terminal heat pumps (PTHPs) of less than 2 tons (24,000 Btu/hr) cooling capacity and whose ratings meet the requirements shown in Table C403.3.2(4) that have reverse-cycle demand defrost and are configured to operate in heat pump mode whenever the outdoor air temperatures are above 25°F (-3.9°C) and the unit is not in defrost. | | --- | --- | | | 2. Heat pumps whose minimum efficiency is regulated by NAECA and whose ratings meet the requirements shown in Table C403.3.2(2) and include all usage of internal electric resistance heating. |

C403.4.1.2 Deadband. Where used to control both heating and cooling, zone thermostatic controls shall be configured to provide a temperature range or deadband of at least 5°F (2.8°C) within which the supply of heating and cooling energy to the zone is shut off or reduced to a minimum.

| EXCEPTIONS: | 1. Thermostats requiring manual changeover between heating and cooling modes. | | --- | --- | | | 2. Occupancies or applications requiring precision in indoor temperature control as approved by the code official. |

C403.4.1.3 Setpoint overlap restriction. Where a zone has a separate heating and a separate cooling thermostatic control located within the zone, a limit switch, mechanical stop or direct digital control system with software programming shall be configured to prevent the heating setpoint from exceeding the cooling setpoint and to maintain a deadband in accordance with Section C403.4.1.2.

C403.4.1.4 Heated or cooled vestibules and air curtains. The heating system for heated vestibules and air curtains with integral heating shall be provided with controls configured to shut off the source of heating when the outdoor air temperature is greater than 45°F (7°C). Vestibule heating and cooling systems shall be controlled by a thermostat located in the vestibule configured to limit heating to a temperature not greater than 60°F (16°C) and cooling to a temperature not less than 85°F (29°C).

| EXCEPTIONS: | 1. Control of heating or cooling provided by transfer air that would otherwise be exhausted. | | --- | --- | | | 2. Vestibule heating only systems are permitted to be controlled without an outdoor air temperature lockout when controlled by a thermostat located in the vestibule configured to limit heating to a temperature not greater than 45°F (7°C) where required for freeze protection of piping and sprinkler heads located in the vestibule. |

C403.4.1.5 Hot water boiler outdoor temperature setback control. Hot water boilers that supply heat to the building through one- or two-pipe heating systems shall have an outdoor setback control that lowers the boiler water temperature based on the outdoor temperature.

C403.4.1.6 Operable opening switches for HVAC system thermostatic control. Operable openings meeting the minimum size criteria of Section C402.5.11 and that open to the outdoors from a conditioned space must have controls configured to do the following once doors have been open for 5 minutes:

1. Disable the mechanical heating to the zone or reset the space heating temperature setpoint to 55°F or less within 5 minutes of the door open enable signal.

2. Disable the mechanical cooling to the zone or reset the space cooling temperature setpoint to 85°F or more within 5 minutes of the door open enable signal.

| EXCEPTION: | Hydronic radiant heating and cooling systems. | | --- | --- |

C403.4.1.7 Demand responsive controls. Thermostatic controls for heating or cooling systems shall be provided with demand responsive controls capable of increasing the cooling setpoint and decreasing the heating setpoint by no less than 4°F (2.2°C). The thermostatic controls shall be capable of performing all other functions provided by the control when the demand responsive controls are not available. Systems with direct digital control of individual zones reporting to a central control panel shall be capable of remotely increasing the cooling setpoint and decreasing the heating setpoint for each zone by no less than 4°F (2.2°C).

| EXCEPTION: | Health care and assisted living facilities. | | --- | --- |

History

• Statutory Authority: RCW 19.27A.045 and chapter 19.27A RCW. WSR 24-16-145, § 51-11C-40341, filed 8/7/24, effective 9/7/24. Statutory Authority: RCW 19.27A.020, 19.27A.025, 19.27A.160, chapters 19.27A and 19.27 RCW. WSR 24-03-085, § 51-11C-40341, filed 1/16/24, effective 3/15/24
• WSR 22-14-091, 23-12-101, and 23-20-021, § 51-11C-40341, filed 7/1/22, 6/7/23, and 9/25/23, effective 3/15/24. Statutory Authority: RCW 19.27A.020, 19.27A.025, 19.27A.160 and chapter 19.27 RCW. WSR 19-24-040, § 51-11C-40341, filed 11/26/19, effective 7/1/20. Statutory Authority: RCW 19.27A.025, 19.27A.160, and 19.27.074. WSR 16-03-072, § 51-11C-40341, filed 1/19/16, effective 7/1/16. Statutory Authority: RCW 19.27A.025, 19.27A.045, 19.27.020, and 19.27.074. WSR 14-24-122, § 51-11C-40341, filed 12/3/14, effective 1/3/15. Statutory Authority: RCW 19.27A.025, 19.27A.045, and 19.27.074. WSR 13-20-120, § 51-11C-40341, filed 10/1/13, effective 11/1/13. Statutory Authority: RCW 19.27A.020, 19.27A.025 and chapters 19.27 and 34.05 RCW. WSR 13-04-056, § 51-11C-40341, filed 2/1/13, effective 7/1/13.

Wash. Admin. Code § 51-11C-40342 Section C403.4.2—Off-hour controls.

C403.4.2 Off-hour controls. For all occupancies other than Group R, each zone shall be provided with thermostatic setback controls that are controlled by either an automatic time clock or programmable control system.

| EXCEPTIONS: | 1. Zones that will be operated continuously. | | --- | --- | | | 2. Zones with a full HVAC load demand not exceeding 6,800 Btu/h (2 kW) and having a manual shutoff switch located with ready access. |

C403.4.2.1 Thermostatic setback. Thermostatic setback controls shall be configured to set back or temporarily operate the system to maintain zone temperatures down to 55°F (13°C) or up to 85°F (29°C).

C403.4.2.2 Automatic setback and shutdown. Automatic time clock or programmable controls shall be capable of starting and stopping the system for seven different daily schedules per week and retaining their programming and time setting during a loss of power for at least 10 hours. Additionally, the controls shall have a manual override that allows temporary operation of the system for up to 2 hours; a manually operated timer configured to operate the system for up to 2 hours; or an occupancy sensor.

C403.4.2.3 Automatic start and stop. Automatic start and stop controls shall be provided for each HVAC system. The automatic start controls shall be configured to automatically adjust the daily start time of the HVAC system in order to bring each space to the desired occupied temperature immediately prior to scheduled occupancy. Automatic stop controls shall be provided for each HVAC system with direct digital control of individual zones. The automatic stop controls shall be configured to reduce the HVAC system's heating temperature setpoint and increase the cooling temperature setpoint by at least 2°F (1.1°C) before scheduled unoccupied periods based upon the thermal lag and acceptable drift in space temperature that is within comfort limits.

C403.4.2.4 Exhaust system off-hour controls. For all occupancies other than Group R, exhaust systems serving spaces within the conditioned envelope shall be controlled by either an automatic time clock, thermostatic controls or programmable control system to operate on the same schedule as the HVAC systems providing their make-up air.

| EXCEPTIONS: | 1. Exhaust systems requiring continuous operation. | | --- | --- | | | 2. Exhaust systems that are controlled by occupancy sensor control configured with automatic on and automatic shutoff within 15 minutes after occupants have left the space. |

C403.4.2.5 Transfer and destratification fan system off-hour controls. For all occupancies other than Group R, transfer fan or mixing fan systems serving spaces within the conditioned envelope shall be controlled by either an automatic time clock, thermostatic controls or programmable control system to operate on the same schedule as the associated HVAC systems.

| EXCEPTION: | Transfer fan and destratification fan systems that are controlled by occupancy sensor control configured with manual on and automatic shutoff within 15 minutes after occupants have left the space. | | --- | --- |

History

• Statutory Authority: RCW 19.27A.020, 19.27A.025, 19.27A.160 and chapters 19.27A and 19.27 RCW. WSR 22-14-091, 23-12-101, and 23-20-021, § 51-11C-40342, filed 7/1/22, 6/7/23, and 9/25/23, effective 3/15/24. Statutory Authority: RCW 19.27A.020, 19.27A.025, 19.27A.160 and chapter 19.27 RCW. WSR 19-24-040, § 51-11C-40342, filed 11/26/19, effective 7/1/20. Statutory Authority: RCW 19.27A.025, 19.27A.160, and 19.27.074. WSR 16-03-072, § 51-11C-40342, filed 1/19/16, effective 7/1/16. Statutory Authority: RCW 19.27A.020, 19.27A.025 and chapters 19.27 and 34.05 RCW. WSR 13-04-056, § 51-11C-40342, filed 2/1/13, effective 7/1/13.

Wash. Admin. Code § 51-11C-40343 Section C403.4.3—Hydronic systems controls.

C403.4.3 Hydronic systems controls. The heating of fluids that have been previously mechanically cooled and the cooling of fluids that have been previously mechanically heated shall be limited in accordance with Sections C403.4.3.1 through C403.4.3.3. Hydronic heating systems comprised of multiple-packaged boilers and designed to deliver conditioned water or steam into a common distribution system shall include automatic controls configured to sequence operation of the boilers. Hydronic heating systems comprised of a single boiler and greater than 500,000 Btu/h (146,550 W) input design capacity shall include either a multi-staged or modulating burner.

C403.4.3.1 Three-pipe system. Hydronic systems that use a common return system for both hot water and chilled water are prohibited.

C403.4.3.2 Two-pipe changeover system. Systems that use a common distribution system to supply both heated and chilled water shall be designed to allow a dead band between changeover from one mode to the other of at least 15°F (8.3°C) outside air temperatures; be designed to and provided with controls that will allow operation in one mode for at least 4 hours before changing over to the other mode; and be provided with controls that allow heating and cooling supply temperatures at the changeover point to be no more than 30°F (16.7°C) apart.

C403.4.3.3 Hydronic (water loop) heat pump systems. Hydronic heat pump systems shall comply with Sections C403.4.3.3.1 through C403.4.3.3.3.

C403.4.3.3.1 Temperature dead band. Hydronic heat pumps connected to a common heat pump water loop with central devices for heat rejection and heat addition shall have controls that are configured to provide a heat pump water supply temperature dead band of at least 20°F (11.1°C) between initiation of heat rejection and heat addition by the central devices.

| EXCEPTION: | Where a system loop temperature optimization controller is installed and can determine the most efficient operating temperature based on real time conditions of demand and capacity, dead bands of less than 20°F (11°C) shall be permitted. | | --- | --- |

C403.4.3.3.2 Heat rejection. The following shall apply to hydronic water loop heat pump systems:

1. Where a closed-circuit cooling tower is used directly in the heat pump loop, an automatic valve shall be installed to bypass the flow of water around the closed-circuit cooling tower, except for the minimum flow necessary for freeze protection. Flow controls for freeze protection shall not allow water through the closed-circuit cooling tower when outdoor temperatures are above the freezing point of the glycol/water solution, i.e., 32°F (0°C) for 100 percent water applications and 18°F (-7.8°C) for 20 percent by mass propylene glycol solution.

2. Where an open-circuit cooling tower is used directly in the heat pump loop, an automatic valve shall be installed to bypass all heat pump water flow around the open-circuit cooling tower.

3. Where an open-circuit cooling tower is used in conjunction with a separate heat exchanger to isolate the open-circuit cooling tower from the heat pump loop, heat loss shall be controlled by shutting down the circulation pump on the cooling tower loop.

| EXCEPTION: | Where it can be demonstrated that a heat pump system will be required to reject heat throughout the year. | | --- | --- |

C403.4.3.3.3 Isolation valve. Each hydronic heat pump on the hydronic system having a total pump system power exceeding 10 horsepower (hp) (7.5 kW) shall have a two-way (but not three-way) valve. For the purposes of this section, pump system power is the sum of the nominal power demand (i.e., nameplate horsepower at nominal motor efficiency) of motors of all pumps that are required to operate at design conditions to supply fluid from the heating or cooling source to all heat transfer devices (e.g., coils, heat exchanger) and return it to the source. This converts the system into a variable flow system and, as such, the primary circulation pumps shall comply with the variable flow requirements in Section C403.4.6.

History

• Statutory Authority: RCW 19.27A.020, 19.27A.025, 19.27A.160 and chapter 19.27 RCW. WSR 19-24-040, § 51-11C-40343, filed 11/26/19, effective 7/1/20. Statutory Authority: RCW 19.27A.025, 19.27A.045, 19.27A.160, and 19.27.074. WSR 16-13-089, § 51-11C-40343, filed 6/15/16, effective 7/16/16. Statutory Authority: RCW 19.27A.025, 19.27A.160, and 19.27.074. WSR 16-03-072, § 51-11C-40343, filed 1/19/16, effective 7/1/16. Statutory Authority: RCW 19.27A.025, 19.27A.045, and 19.27.074. WSR 13-20-120, § 51-11C-40343, filed 10/1/13, effective 11/1/13. Statutory Authority: RCW 19.27A.020, 19.27A.025 and chapters 19.27 and 34.05 RCW. WSR 13-04-056, § 51-11C-40343, filed 2/1/13, effective 7/1/13.

Wash. Admin. Code § 51-11C-403431 Reserved.

History

• Statutory Authority: RCW 19.27A.025, 19.27A.160, and 19.27.074. WSR 16-03-072, § 51-11C-403431, filed 1/19/16, effective 7/1/16. Statutory Authority: RCW 19.27A.020, 19.27A.025 and chapters 19.27 and 34.05 RCW. WSR 13-04-056, § 51-11C-403431, filed 2/1/13, effective 7/1/13.

Wash. Admin. Code § 51-11C-40344 Section C403.4.4—Part load controls.

C403.4.4 Part load controls. Hydronic systems greater than or equal to 300,000 Btu/h (88 kW) in design output capacity supplying heated or chilled water to comfort conditioning systems shall include controls that are configured to:

1. Automatically reset the supply-water temperatures in response to varying building heating and cooling demand using coil valve position, zone-return water temperature or outdoor air temperature. The temperature shall be reset by not less than 25 percent of the design supply-to-return water temperature difference.

| EXCEPTIONS: | 1. Hydronic systems serving hydronic heat pumps. | | --- | --- | | | 2. Hydronic systems with thermal energy storage where resetting the supply-water temperature would reduce the capacity of the storage. |

2. Automatically vary fluid flow for hydronic systems with a combined pump motor capacity of 2 hp or larger with three or more control valves or other devices by reducing the system design flow rate by not less than 50 percent or the maximum reduction allowed by the equipment manufacturer for proper operation of equipment by valves that modulate or step open and close, or pumps that modulate or turn on and off as a function of load.

3. Automatically vary pump flow on heating water systems, chilled-water systems and heat rejection loops serving water-cooled unitary air conditioners as follows:

3.1. Where pumps operate continuously or operate based on a time schedule, pumps with nominal output motor power of 2 hp or more shall have a variable speed drive.

3.2. Where pumps have automatic direct digital control configured to operate pumps only when zone heating or cooling is required, a variable speed drive shall be provided for pumps with motors having the same or greater nominal output power indicated in Table C403.4.4 based on the climate zone and system served.

4. Where variable speed drive is required by Item 3 of this section, pump motor power input shall be not more than 30 percent of design wattage at 50 percent of the design water flow. Pump flow shall be controlled to maintain one control valve nearly wide open or to satisfy the minimum differential pressure.

| EXCEPTIONS: | 1. Supply-water temperature reset is not required for chilled-water systems supplied by off-site district chilled water or chilled water from ice storage systems. | | --- | --- | | | 2. Variable pump flow is not required on dedicated coil circulation pumps where needed for freeze protection. | | | 3. Variable pump flow is not required on dedicated equipment circulation pumps where configured in primary/secondary design to provide the minimum flow requirements of the equipment manufacturer for proper operation of equipment. | | | 4. Variable speed drives are not required on heating water pumps where more than 50 percent of annual heat is generated by an electric boiler. |

Table C403.4.4

Variable Speed Drive (VSD) Requirements for Demand-Controlled Pumps

| Climate Zones 4c, 5b | VSD Required for Motors with Rated Output of at Least | | --- | --- | | Heating water pumps | ≥7.5 hp | | Chilled water and heat rejection loop pumps | ≥7.5 hp |

History

• Statutory Authority: RCW 19.27A.020, 19.27A.025, 19.27A.160 and chapters 19.27A and 19.27 RCW. WSR 22-14-091, 23-12-101, and 23-20-021, § 51-11C-40344, filed 7/1/22, 6/7/23, and 9/25/23, effective 3/15/24. Statutory Authority: RCW 19.27A.020, 19.27A.025, 19.27A.160 and chapter 19.27 RCW. WSR 19-24-040, § 51-11C-40344, filed 11/26/19, effective 7/1/20. Statutory Authority: RCW 19.27A.025, 19.27A.045, 19.27A.160, and 19.27.074. WSR 17-10-062, § 51-11C-40344, filed 5/2/17, effective 6/2/17. Statutory Authority: RCW 19.27A.025, 19.27A.160, and 19.27.074. WSR 16-03-072, § 51-11C-40344, filed 1/19/16, effective 7/1/16. Statutory Authority: RCW 19.27A.020, 19.27A.025 and chapters 19.27 and 34.05 RCW. WSR 13-04-056, § 51-11C-40344, filed 2/1/13, effective 7/1/13.

Wash. Admin. Code § 51-11C-40345 Section C403.4.5—Pump isolation.

C403.4.5 Pump isolation. Chilled water plants including more than one chiller shall be capable of and configured to reduce flow automatically through the chiller plant when a chiller is shut down and automatically shut off flow to chillers that are shut down. Chillers piped in series for the purpose of increased temperature differential shall be considered as one chiller.

Boiler systems including more than one boiler shall be capable of and configured to reduce flow automatically through the boiler system when a boiler is shut down.

History

• Statutory Authority: RCW 19.27A.020, 19.27A.025, 19.27A.160 and chapter 19.27 RCW. WSR 19-24-040, § 51-11C-40345, filed 11/26/19, effective 7/1/20. Statutory Authority: RCW 19.27A.025, 19.27A.045, 19.27A.160, and 19.27.074. WSR 16-13-089, § 51-11C-40345, filed 6/15/16, effective 7/16/16. Statutory Authority: RCW 19.27A.025, 19.27A.160, and 19.27.074. WSR 16-03-072, § 51-11C-40345, filed 1/19/16, effective 7/1/16. Statutory Authority: RCW 19.27A.020, 19.27A.025 and chapters 19.27 and 34.05 RCW. WSR 13-04-056, § 51-11C-40345, filed 2/1/13, effective 7/1/13.

Wash. Admin. Code § 51-11C-40346 Section C403.4.6—Variable flow controls.

C403.4.6 Variable flow controls. Individual pumps required by this code to have variable speed control shall be controlled in one of the following manners:

1. For systems having a combined pump motor horsepower less than or equal to 20 hp (15 kW) and without direct digital control of individual coils, pump speed shall be a function of either:

1.1. Required differential pressure; or

1.2. Reset directly based on zone hydronic demand, or other zone load indicators; or

1.3. Reset directly based on pump power and pump differential pressure; or

1.4. Reset directly by an integral controller based on the relationship between variable speed controller frequency and power.

2. For systems having a combined pump motor horsepower that exceeds 20 hp (15 kW) or smaller systems with direct digital control, pump speed shall be a function of either:

2.1. The static pressure set point as reset based on the valve requiring the most pressure; or

2.2. Directly controlled based on zone hydronic demand; or

2.3. Reset directly by an integral controller based on the relationship between variable speed controller frequency and power.

History

• Statutory Authority: RCW 19.27A.025, 19.27A.045 and chapter 19.27 RCW. WSR 20-21-080, § 51-11C-40346, filed 10/19/20, effective 2/1/21. Statutory Authority: RCW 19.27A.020, 19.27A.025, 19.27A.160 and chapter 19.27 RCW. WSR 19-24-040, § 51-11C-40346, filed 11/26/19, effective 7/1/20. Statutory Authority: RCW 19.27A.025, 19.27A.160, and 19.27.074. WSR 16-03-072, § 51-11C-40346, filed 1/19/16, effective 7/1/16. Statutory Authority: RCW 19.27A.020, 19.27A.025 and chapters 19.27 and 34.05 RCW. WSR 13-04-056, § 51-11C-40346, filed 2/1/13, effective 7/1/13.

Wash. Admin. Code § 51-11C-40347 Section C403.4.7—Combustion heating equipment controls.

C403.4.7 Combustion heating equipment controls. Combustion heating equipment with a capacity over 225,000 Btu/h shall have modulating or staged combustion control.

| EXCEPTIONS: | 1. Boilers. | | --- | --- | | | 2. Radiant heaters. |

C403.4.7.1 Combustion decorative vented appliance, combustion fireplace and fire pit controls. Combustion decorative vented appliances, combustion fireplaces and fire pits shall be equipped with local controls to limit operation to a maximum duration of one hour without override hold capability or shall be controlled by occupancy sensor control configured with manual on and automatic shutoff within 15 minutes after occupants have left the space.

History

• Statutory Authority: RCW 19.27A.020, 19.27A.025, 19.27A.160 and chapter 19.27 RCW. WSR 19-24-040, § 51-11C-40347, filed 11/26/19, effective 7/1/20. Statutory Authority: RCW 19.27A.025, 19.27A.045, 19.27A.160, and 19.27.074. WSR 17-10-062, § 51-11C-40347, filed 5/2/17, effective 6/2/17. Statutory Authority: RCW 19.27A.020, 19.27A.025 and chapters 19.27 and 34.05 RCW. WSR 13-04-056, § 51-11C-40347, filed 2/1/13, effective 7/1/13.

Wash. Admin. Code § 51-11C-40348 Sections C403.4.8 through C403.4.10—Group R requirements.

C403.4.8 Group R-1 hotel/motel guestrooms. See Section C403.7.4.

C403.4.9 Group R-2 and R-3 dwelling units. The primary space conditioning system within each dwelling unit shall be provided with at least one programmable thermostat for the regulation of space temperature. The thermostat shall allow for, at a minimum, a 5-2 programmable schedule (weekdays/weekends) and be capable of providing at least two programmable setback periods per day.

Each additional system provided within the dwelling unit shall be provided with at least one adjustable thermostat for the regulation of temperature.

| EXCEPTIONS: | 1. Systems controlled by an occupant sensor that is configured to shut the system off when no occupant is sensed for a period of up to 30 minutes. | | --- | --- | | | 2. Systems controlled solely by a manually operated timer configured to operate the system for no more than 2 hours. | | | 3. Ductless heat pumps. |

Each thermostat shall be capable of being set by adjustment or selection of sensors and configured as follows:

1. When used to control heating only: 55°F to 75°F.

2. When used to control cooling only: 70°F to 85°F.

3. All other: 55°F to 85°F with an adjustable deadband configured to at least 5°F in accordance with Section C403.4.1.2.

C403.4.10 Group R-2 sleeping units. The primary space conditioning system within each sleeping unit shall be provided with at least one programmable thermostat for the regulation of space temperature. The thermostat shall allow for, at a minimum, a 5-2 programmable schedule (weekdays/weekends) and be capable of providing at least two programmable setback periods per day.

Each additional system provided within the sleeping unit shall be provided with at least one adjustable thermostat for the regulation of temperature.

| EXCEPTIONS: | 1. Systems controlled by an occupant sensor that is configured to shut the system off when no occupant is sensed for a period of up to 30 minutes. | | --- | --- | | | 2. Systems controlled solely by a manually operated timer configured to operate the system for no more than 2 hours. | | | 3. Zones with a full HVAC load demand not exceeding 3,400 Btu/h (1 kW) and having a manual shutoff switch located with ready access. | | | 4. Ductless heat pumps. |

Each thermostat shall be capable of being set by adjustment or selection of sensors and configured as follows:

1. When used to control heating only: 55°F to 75°F.

2. When used to control cooling only: 70°F to 85°F.

3. All other: 55°F to 85°F with an adjustable deadband configured to at least 5°F in accordance with Section C403.4.1.2.

History

• Statutory Authority: RCW 19.27A.020, 19.27A.025, 19.27A.160 and chapter 19.27 RCW. WSR 19-24-040, § 51-11C-40348, filed 11/26/19, effective 7/1/20.

Wash. Admin. Code § 51-11C-40349 Sections C403.4.11 and C403.4.12.

C403.4.11 Direct digital control systems. Direct digital control (DDC) shall be required as specified in Sections C403.4.11.1 through C403.4.11.4.

C403.4.11.1 DDC applications. DDC shall be provided in the applications and qualifications listed in Table C403.4.11.1 and for load management measures where installed to meet the requirements of Section C406.3.

C403.4.11.2 DDC controls. Where DDC is required by Section C403.4.11.1, the DDC system shall be configured to perform all of the following functions, as required to provide the system and zone control logic required in Sections C403.2, C403.5, C403.6.8 and C403.4.3:

1. Monitor zone and system demand for fan pressure, pump pressure, heating and cooling.

2. Transfer zone and system demand information from zones to air distribution system controllers and from air distribution systems to heating and cooling plant controllers.

C403.4.11.3 DDC display. Where DDC is required by Section C403.4.11.1 for new buildings, the DDC system shall be configured to gather and provide trending data and graphically displaying input and output points.

C403.4.11.4 DDC demand response setpoint adjustment. Where DDC is required by Section C403.4.11.1 for new buildings and serve mechanical systems with a cooling capacity exceeding 780,000 Btu/h (2,662 kW), the DDC system shall be capable of demand response setpoint adjustment. The DDC system shall be configured with control logic to increase the cooling zone setpoints by at least 2°F (1°C) and reduce the heating zone setpoints by at least 2°F (1°C) when activated by a demand response signal. The demand response signal shall be a binary input to the control system or other interface approved by the serving electric utility.

Table C403.4.11.1

DDC Applications and Qualifications

| Building Status | Application | Qualifications | | --- | --- | --- | | New building | Air-handling system and all zones served by the system | Individual systems supplying more than three zones and with fan system bhp of 10 hp and larger | | Chilled-water plant and all coils and terminal units served by the system | Individual plants supplying more than three zones and with design cooling capacity of 300,000 Btu/h and larger | | | Hot-water plant and all coils and terminal units served by the system | Individual plants supplying more than three zones and with design heating capacity of 300,000 Btu/h and larger | | | Alteration or addition | Zone terminal unit such as VAV box | Where existing zones served by the same air-handling, chilled-water, or hot-water system have DDC | | Air-handling system or fan coil | Where existing air-handling system(s) and fan coil(s) served by the same chilled- or hot-water plant have DDC | | | New air-handling system and all new zones served by the system | Individual systems with fan system bhp of 10 hp and larger and supplying more than three zones and more than 75 percent of zones are new | | | New or upgraded chilled-water plant | Where all chillers are new and plant design cooling capacity is 300,000 Btu/h and larger | | | New or upgraded hot-water plant | Where all boilers are new and plant design heating capacity is 300,000 Btu/h and larger | |

C403.4.12 Pressure independent control valves. Where design flow rate of heating water and chilled water coils is 5 gpm or higher, modulating pressure independent control valves shall be provided.

History

• Statutory Authority: RCW 19.27A.045 and chapter 19.27A RCW. WSR 24-16-145, § 51-11C-40349, filed 8/7/24, effective 9/7/24. Statutory Authority: RCW 19.27A.020, 19.27A.025, 19.27A.160 and chapters 19.27A and 19.27 RCW. WSR 22-14-091, 23-12-101, and 23-20-021, § 51-11C-40349, filed 7/1/22, 6/7/23, and 9/25/23, effective 3/15/24. Statutory Authority: RCW 19.27A.020, 19.27A.025, 19.27A.160 and chapter 19.27 RCW. WSR 19-24-040, § 51-11C-40349, filed 11/26/19, effective 7/1/20.

Wash. Admin. Code § 51-11C-40350 Section C403.5—Economizers.

C403.5 Economizers. Air economizers shall be provided on all new cooling systems including those serving computer server rooms, electronic equipment, radio equipment, and telephone switchgear. Economizers shall comply with Sections C403.5.1 through C403.5.5.

| EXCEPTIONS: | 1a. For other than Group R-2 occupancies, cooling system where the supply fan is not installed outside the building thermal envelope nor in a mechanical room adjacent to outdoors, and is installed in conjunction with DOAS complying with Section C403.3.5 and serving only spaces with year-round cooling loads from lights and equipment of less than 5 watts per square foot. | | --- | --- | | | 1b. For Group R-2 occupancies, cooling system where the supply fan is not installed outside the building thermal envelope nor in a mechanical room adjacent to outdoors, and is installed in conjunction with DOAS complying with Section C403.3.5, where the ERV/HRV has a minimum 68 percent sensible recovery or 60 percent enthalpy recovery heating effectiveness, and serving only spaces with year-round cooling loads from lights and equipment of less than 5 watts per square foot. | | | 2. Unitary or packaged systems serving one zone with dehumidification that affect other systems so as to increase the overall building energy consumption. New humidification equipment shall comply with Section C403.3.2.7. | | | 3. Unitary or packaged systems serving one zone where the cooling efficiency meets or exceeds the efficiency requirements in Table C403.5. | | | 4. Equipment serving chilled beams and chilled ceiling space cooling systems only which are provided with a water economizer meeting the requirements of Section C403.5.4. | | | 5. For Group R occupancies, cooling unit where the supply fan is not installed outside the building thermal envelope or in a mechanical room adjacent to outdoors with a total cooling capacity less than 20,000 Btu/h and other cooling units with a total cooling capacity less than 54,000 Btu/h provided that these are high-efficiency cooling equipment with IEER, CEER, SEER, and EER values more than 15 percent higher than minimum efficiencies listed in Tables C403.3.2(1), C403.3.2(2), C403.3.2(4), C403.3.2(8) and C403.3.2(9) or an IPLV kW/ton that is at least 15 percent lower than the minimum efficiencies listed in Table C403.3.2(3) or C403.3.2(15), in the appropriate size category, using the same test procedures. Equipment shall be listed in the appropriate certification program to qualify for this exception. For split systems, compliance is based on the cooling capacity of individual fan coil units. | | | 6. Equipment used to cool Controlled Plant Growth Environments provided these are high-efficiency cooling equipment with SEER, EER and IEER values a minimum of 20 percent greater than the values listed in Tables C403.3.2 (1), (3), (4), and (15). | | | 7. Equipment serving a space with year-round cooling loads from lights and equipment of 5 watts per square foot or greater complying with the following criteria: | | | 7.1. Equipment serving the space utilizes chilled water as the cooling source; and | | | 7.2. The chilled water plant includes a condenser heat recovery system that meets the requirements of Section C403.9.5 or the building and water-cooled system meets the following requirements: | | | 7.2.1. A minimum of 90 percent (capacity-weighted) of the building space heat is provided by hydronic heating water. | | | 7.2.2. Chilled water plant includes a heat recovery chiller or water-to-water heat pump capable of rejecting heat from the chilled water system to the hydronic heating equipment capacity. | | | 7.2.3. Heat recovery chillers shall have a minimum COP of 7.0 when providing heating and cooling water simultaneously. | | | 8. Water-cooled equipment served by systems meeting the requirements of Section C403.9.2.4 Condenser heat recovery. | | | 9. Equipment used to cool any dedicated server room, electronic equipment room or telecom switch room provided the system complies with option a, b, or c in the table below. The total cooling capacity of all fan systems without economizers shall not exceed 240,000 Btu/h per building or 10 percent of its air economizer capacity, whichever is greater. This exception shall not be used for total building performance. | | | 10. Dedicated outdoor air systems that include energy recovery as required by Section C403.7.6 but do not include mechanical cooling. | | | 11. Dedicated outdoor air systems not required by Section C403.7.6 to include energy recovery that modulate the supply airflow to provide only the minimum outdoor air required by Section C403.2.2.1 for ventilation, exhaust air make-up, or other process air delivery. |

| | Equipment Type | Higher Equipment Efficiency | Part-Load Control | Economizer | | --- | --- | --- | --- | --- | | Option a | Tables C403.3.2(1), C403.3.2(2) and C403.3.2 (14)a | +15%b | Required over 85,000 Btu/hc | None Required | | Option b | Tables C403.3.2(1), C403.3.2(2) and C403.3.2 (14)a | +5%d | Required over 85,000 Btu/hc | Waterside Economizere | | Option c | ASHRAE Standard 127f | +0%g | Required over 85,000 Btu/hc | Waterside Economizere |

| Notes for Exception 9: | | | --- | --- | | a | For a system where all of the cooling equipment is subject to the AHRI standards listed in Tables C403.3.2(1), C403.3.2(2), and C403.3.2 (14), the system shall comply with all of the following (note that if the system contains any cooling equipment that exceeds the capacity limits in Table C403.3.2(1), C403.3.2(2), or C403.3.2 (14), or if the system contains any cooling equipment that is not included in Table C403.3.2(1), C403.3.2(2), or C403.3.2 (14), then the system is not allowed to use this option). | | b | The cooling equipment shall have an EER value and an IPLV value that is a minimum of 15 percent greater than the value listed in Tables C403.3.2(1), C403.3.2(2), and C403.3.2 (14). | | c | For units with a total cooling capacity over 85,000 Btu/h, the system shall utilize part-load capacity control schemes that are able to modulate to a part-load capacity of 50 percent of the load or less that results in the compressor operating at the same or higher EER at part loads than at full load (e.g., minimum of two-stages of compressor unloading such as cylinder unloading, two-stage scrolls, dual tandem scrolls, but hot gas bypass is not credited as a compressor unloading system). | | d | The cooling equipment shall have an EER value and an IPLV value that is a minimum of 5 percent greater than the value listed in Tables C403.3.2(1), C403.3.2(2), and C403.3.2 (14). | | e | The system shall include a water economizer in lieu of air economizer. Water economizers shall meet the requirements of C403.5.1 and C403.5.2 and be capable of providing the total concurrent cooling load served by the connected terminal equipment lacking airside economizer, at outside air temperatures of 50°F dry-bulb/45°F wet-bulb and below. For this calculation, all factors including solar and internal load shall be the same as those used for peak load calculations, except for the outside temperatures. The equipment shall be served by a dedicated condenser water system unless a nondedicated condenser water system exists that can provide appropriate water temperatures during hours when waterside economizer cooling is available. | | f | For a system where all cooling equipment is subject to ASHRAE Standard 127. | | g | The cooling equipment subject to the ASHRAE Standard 127 shall have an EER value and an IPLV value that is equal to or greater than the value listed in Tables C403.3.2(1), C403.3.2(2), and C403.3.2 (14) when determined in accordance with the rating conditions ASHRAE Standard 127 (i.e., not the rating conditions in AHRI Standard 210/240 or 340/360). This information shall be provided by an independent third party. |

Table C403.5

Equipment Efficiency Performance

Exception for Economizers

| Climate Zones | Efficiency Improvementa | | --- | --- | | 4C | 64% | | 5B | 59% |

| a | If a unit is rated with an IPLV, IEER or SEER then to eliminate the required air or water economizer, the minimum cooling efficiency of the HVAC unit must be increased by the percentage shown. If the HVAC unit is only rated with a full load metric like EER or COP cooling, then these must be increased by the percentage shown. | | --- | --- |

History

• Statutory Authority: RCW 19.27A.045 and chapter 19.27A RCW. WSR 24-16-145, § 51-11C-40350, filed 8/7/24, effective 9/7/24. Statutory Authority: RCW 19.27A.020, 19.27A.025, 19.27A.160 and chapters 19.27A and 19.27 RCW. WSR 22-14-091, 23-12-101, and 23-20-021, § 51-11C-40350, filed 7/1/22, 6/7/23, and 9/25/23, effective 3/15/24. Statutory Authority: RCW 19.27A.020, 19.27A.025, 19.27A.160 and chapter 19.27 RCW. WSR 19-24-040, § 51-11C-40350, filed 11/26/19, effective 7/1/20. Statutory Authority: RCW 19.27A.025, 19.27A.160, and 19.27.074. WSR 16-03-072, § 51-11C-40350, filed 1/19/16, effective 7/1/16. Statutory Authority: RCW 19.27A.020, 19.27A.025 and chapters 19.27 and 34.05 RCW. WSR 13-04-056, § 51-11C-40350, filed 2/1/13, effective 7/1/13.

Wash. Admin. Code § 51-11C-40351 Section C403.5.1—Integrated economizer control.

C403.5.1 Integrated economizer control. Economizer systems shall be integrated with the mechanical cooling system and be configured to provide partial cooling even where additional mechanical cooling is required to provide the remainder of the cooling load. Controls shall not be capable of creating a false load in the mechanical cooling system by limiting or disabling the economizer or any other means, such as hot gas bypass, except at the lowest stage of mechanical cooling.

Units that include an air economizer shall comply with the following:

1. Unit controls shall have the mechanical cooling capacity control interlocked with the air economizer controls such that the outdoor air damper is at the 100 percent open position when mechanical cooling is on and the outdoor air damper does not begin to close to prevent coil freezing due to minimum compressor run time until the leaving air temperature is less than 45°F (7°C).

2. Direct expansion (DX) units with cooling capacity 65,000 Btu/h (19 kW) or greater of rated capacity shall comply with the following:

2.1. DX units that control the capacity of the mechanical cooling directly based on occupied space temperature shall have not fewer than two stages of mechanical cooling capacity.

2.2. Other DX units, including those that control space temperature by modulating the airflow to the space, shall be in accordance with Table C403.5.1.

Table C403.5.1

DX Cooling Stage Requirements for Modulating Airflow Units

| Rating Capacity | Minimum Number of Mechanical Cooling Stages | Minimum Compressor Displacementa | | --- | --- | --- | | ≥ 65,000 Btu/h and < 240,000 Btu/h | 3 stages | ≤ 35% of full load | | ≥ 240,000 Btu/h | 4 stages | ≤ 25% full load |

| For SI: 1 British thermal unit per hour = 0.2931 W. | | | --- | --- | | a | For mechanical cooling stage control that does not use variable compressor displacement, the percent displacement shall be equivalent to the mechanical cooling capacity reduction evaluated at the full load rating conditions for the compressor. |

History

• Statutory Authority: RCW 19.27A.020, 19.27A.025, 19.27A.160 and chapter 19.27 RCW. WSR 19-24-040, § 51-11C-40351, filed 11/26/19, effective 7/1/20.

Wash. Admin. Code § 51-11C-40352 Section C403.5.2—Economizer heating system impact.

C403.5.2 Economizer heating system impact. HVAC system design and economizer controls shall be such that economizer operation does not increase building heating energy use during normal operation.

| EXCEPTION: | Economizers on VAV systems that cause zone level heating to increase due to a reduction in supply air temperature. | | --- | --- |

History

• Statutory Authority: RCW 19.27A.020, 19.27A.025, 19.27A.160 and chapter 19.27 RCW. WSR 19-24-040, § 51-11C-40352, filed 11/26/19, effective 7/1/20.

Wash. Admin. Code § 51-11C-40353 Section C403.5.3—Air economizers.

C403.5.3 Air economizers. Air economizers shall comply with Sections C403.5.3.1 through C403.5.3.5.

C403.5.3.1 Design capacity. Air economizer systems shall be configured to modulate outdoor air and return air dampers to provide up to 100 percent of the design supply air quantity as outdoor air for cooling.

C403.5.3.2 Control signal. Economizer controls and dampers shall be configured to sequence the dampers with the mechanical cooling equipment and shall not be controlled by only mixed air temperature. Air economizers on systems with cooling capacity greater than 65,000 Btu/h shall be configured to provide partial cooling even when additional mechanical cooling is required to meet the remainder of the cooling load.

| EXCEPTION: | The use of mixed air temperature limit control shall be permitted for systems that are both controlled from space temperature (such as single zone systems) and having cooling capacity less than 65,000 Btu/h. | | --- | --- |

C403.5.3.3 High-limit shutoff. Air economizers shall be configured to automatically reduce outdoor air intake to the design minimum outdoor air quantity when outdoor air intake will no longer reduce cooling energy usage. High-limit shutoff control types shall be chosen from Table C403.5.3.3. High-limit shutoff control settings for these control types shall be those specified in Table C403.5.3.3.

Table C403.5.3.3

High-Limit Shutoff Control Setting for Air Economizersb

| Device Type | Required High Limit (Economizer off when): | Required High Limit For Cycling Fansc (Economizer off when): | | | | --- | --- | --- | --- | --- | | Equation | Description | Equation | Description | | | Fixed dry-bulb | TOA ˃ 75°F | Outdoor air temperature exceeds 75°F | TOA ˃ 70°F | Outdoor air temperature exceeds 70°F | | Differential dry-bulb | TOA ˃ TRA | Outdoor air temperature exceeds return air temperature | TOA ˃ (TRA- 5) | Outdoor air temperature exceeds return air temperature - 5 | | Fixed enthalpy with fixed dry-bulb temperatures | hOA ˃ 28 Btu/lba or TOA ˃ 75°F | Outdoor air enthalpy exceeds 28 Btu/lb of dry aira or outdoor air temperature exceeds 75°F | hOA ˃ 26 Btu/lba or TOA ˃ 70°F | Outdoor air enthalpy exceeds 26 Btu/lb of dry aird or outdoor air temperature exceeds 70°F | | Differential enthalpy with fixed dry-bulb temperature | hOA ˃ hRA or TOA ˃ 75°F | Outdoor air enthalpy exceeds return air enthalpy or outdoor air temperature exceeds 75°F | hOA ˃ (hRA - 2) or TOA ˃ 70°F | Outdoor air enthalpy exceeds return air enthalpy or outdoor air temperature exceeds 70°F |

| For SI: | °C = (°F - 32) × 5/9, 1 Btu/lb = 2.33 kJ/kg. | | --- | --- | | a | At altitudes substantially different than sea level, the fixed enthalpy limit shall be set to the enthalpy value at 75°F and 50 percent relative humidity. As an example, at approximately 6,000 feet elevation the fixed enthalpy limit is approximately 30.7 Btu/lb. | | b | Devices with selectable setpoints shall be capable of being set to within 2°F and 2 Btu/lb of the setpoint listed. | | c | Where fans cycle on only to provide heating and cooling, limits are adjusted lower to compensate for fan energy use in economizer mode. | | d | For cycling fans at altitudes substantially different than sea level, the fixed enthalpy limit shall be set to the enthalpy value at 70°F and 50 percent relative humidity. |

C403.5.3.4 Relief of excess outdoor air. Systems shall be capable of relieving excess outdoor air during air economizer operation to prevent over-pressurizing the building. The relief air outlet shall be located to avoid recirculation into the building.

C403.5.3.5 Economizer dampers. Return, exhaust/relief and outdoor air dampers used in economizers shall comply with Section C403.7.8.

History

• Statutory Authority: RCW 19.27A.025, 19.27A.045 and chapter 19.27 RCW. WSR 20-21-080, § 51-11C-40353, filed 10/19/20, effective 2/1/21. Statutory Authority: RCW 19.27A.020, 19.27A.025, 19.27A.160 and chapter 19.27 RCW. WSR 19-24-040, § 51-11C-40353, filed 11/26/19, effective 7/1/20.

Wash. Admin. Code § 51-11C-40354 Section C403.5.4—Waterside economizers.

C403.5.4 Waterside economizers. Waterside economizers shall comply with Sections C403.5.4.1 and C403.5.4.2.

C403.5.4.1 Design capacity. Water economizer systems shall be configured to cool supply air by indirect evaporation and providing up to 100 percent of the expected system cooling load at outdoor air temperatures of 50°F dry-bulb (10°C dry-bulb)/45°F wet-bulb (7.2°C wet-bulb) and below.

| EXCEPTION: | Systems where dehumidification requirements cannot be met using outdoor air temperatures of 50°F dry-bulb (10°C dry-bulb)/45°F wet-bulb (7.2°C wet-bulb) and where 100 percent of the expected system cooling load at 45°F dry-bulb (7.2°C dry-bulb)/40°F wet-bulb (4.5°C wet-bulb) is met with evaporative water economizers. | | --- | --- |

C403.5.4.2 Maximum pressure drop. Precooling coils and water-to-water heat exchangers used as part of a water economizer system shall either have a waterside pressure drop of less than 15 feet (4572 mm) of water or a secondary loop shall be created so that the coil or heat exchanger pressure drop is not seen by the circulating pumps when the system is in the normal cooling (noneconomizer) mode.

History

• Statutory Authority: RCW 19.27A.025, 19.27A.045 and chapter 19.27 RCW. WSR 20-21-080, § 51-11C-40354, filed 10/19/20, effective 2/1/21. Statutory Authority: RCW 19.27A.020, 19.27A.025, 19.27A.160 and chapter 19.27 RCW. WSR 19-24-040, § 51-11C-40354, filed 11/26/19, effective 7/1/20.

Wash. Admin. Code § 51-11C-40355 Section C403.5.5—Economizer fault detection and diagnostics.

C403.5.5 Economizer fault detection and diagnostics (FDD). Air-cooled unitary direct-expansion units with a cooling capacity of 54,000 Btu/h or greater listed in the tables in Section C403.3.2 that are equipped with an economizer in accordance with Section C403.5 shall include a fault detection and diagnostics (FDD) system complying with the following:

1. The following temperature sensors shall be permanently installed to monitor system operation:

1.1. Outside air.

1.2. Supply air.

1.3. Return air.

2. Temperature sensors shall have an accuracy of ±2°F (1.1°C) over the range of 40°F to 80°F (4°C to 26.7°C).

3. Refrigerant pressure sensors, where used, shall have an accuracy of ±3 percent of full scale.

4. The unit controller shall be configured to provide system status by indicating the following:

4.1. Free cooling available.

4.2. Economizer enabled.

4.3. Compressor enabled.

4.4. Heating enabled.

4.5. Mixed air low limit cycle active.

4.6. The current value of each sensor.

5. The unit controller shall be capable of manually initiating each operating mode so that the operation of compressors, economizers, fans and the heating system can be independently tested and verified.

6. The unit shall be configured to report faults to a fault management application available for access by day-to-day operating or service personnel or annunciated locally on zone thermostats.

7. The FDD system shall be configured to detect the following faults:

7.1. Air temperature sensor failure/fault.

7.2. Not economizing when the unit should be economizing.

7.3. Economizing when the unit should not be economizing.

7.4. Damper not modulating.

7.5. Excess outdoor air.

History

• Statutory Authority: RCW 19.27A.020, 19.27A.025, 19.27A.160 and chapters 19.27A and 19.27 RCW. WSR 22-14-091, 23-12-101, and 23-20-021, § 51-11C-40355, filed 7/1/22, 6/7/23, and 9/25/23, effective 3/15/24. Statutory Authority: RCW 19.27A.020, 19.27A.025, 19.27A.160 and chapter 19.27 RCW. WSR 19-24-040, § 51-11C-40355, filed 11/26/19, effective 7/1/20.

Wash. Admin. Code § 51-11C-40360 Section C403.6—Requirements for mechanical systems serving multiple zones.

C403.6 Requirements for mechanical systems serving multiple zones. Sections C403.6.1 through C403.6.10 shall apply to mechanical systems serving multiple zones.

C403.6.1 Variable air volume (VAV) and multiple zone systems. Supply air systems serving multiple zones shall be VAV systems that have zone controls configured to reduce the volume of air that is reheated, recooled or mixed in each zone to one of the following:

1. Twenty percent of the zone design peak supply for systems with direct digital control (DDC) and 30 percent of the maximum supply air for other systems.

2. Systems with DDC where items 2.1 through 2.3 apply.

2.1. The airflow rate in the deadband between heating and cooling does not exceed 20 percent of the zone design peak supply rate or higher allowed rates under Items 3, 4, or 5 of this section.

2.2. The first stage of heating modulates the zone supply air temperature setpoint up to a maximum setpoint while the airflow is maintained at the deadband flow rate.

2.3. The second stage of heating modulates the airflow rate from the deadband flow rate up to the heating maximum flow rate that is less than 50 percent of the zone design peak supply rate.

3. The outdoor airflow rate required to meet the minimum ventilation requirements of Chapter 4 of the International Mechanical Code.

4. Any higher rate that can be demonstrated to reduce overall system annual energy use by offsetting reheat/recool energy losses through a reduction in outdoor air intake for the system, as approved by the code official.

5. The airflow rates to comply with applicable codes or accreditation standards such as pressure relationships or minimum air change rates.

| EXCEPTION: | The following individual zones or entire air distribution systems are exempted from the requirement for VAV control: | | --- | --- | | | 1. Zones or supply air systems where not less than 75 percent of the energy for reheating or for providing warm air in mixing systems is provided from a site-recovered source, including condenser heat. | | | 2. Systems that prevent reheating, recooling, mixing or simultaneous supply of air that has been previously cooled, either mechanically or through the use of economizer systems, and air that has been previously mechanically heated. | | | 3. Ventilation systems complying with Section C403.3.5, DOAS, with ventilation rates comply with Section C403.2.2. |

C403.6.2 Single duct variable air volume (VAV) systems, terminal devices. Single duct VAV systems shall use terminal devices capable of and configured to reduce the supply of primary supply air before reheating or recooling takes place.

C403.6.3 Dual duct and mixing VAV systems, terminal devices. Systems that have one warm air duct and one cool air duct shall use terminal devices which are capable of and configured to reduce the flow from one duct to a minimum before mixing of air from the other duct takes place.

C403.6.4 Supply-air temperature reset controls. Multiple zone HVAC systems shall include controls that are capable of and configured to automatically reset the supply-air temperature in response to representative building loads, or to outdoor air temperature. The controls shall be configured to reset the supply air temperature at least 25 percent of the difference between the design supply-air temperature and the design room air temperature. Controls that adjust the reset based on zone humidity are allowed. HVAC zones that are expected to experience relatively constant loads shall have maximum airflow designed to accommodate the fully reset supply air temperature.

| EXCEPTIONS: | 1. Systems that prevent reheating, recooling or mixing of heated and cooled supply air. | | --- | --- | | | 2. Seventy-five percent of the energy for reheating is from a site-recovered source. |

C403.6.5 Multiple-zone VAV system ventilation optimization control. Multiple-zone VAV systems with direct digital control of individual zone boxes reporting to a central control panel shall have automatic controls configured to reduce outdoor air intake flow below design rates in response to changes in system ventilation efficiency (Ev) as defined by the International Mechanical Code.

| EXCEPTIONS: | 1. VAV systems with zonal transfer fans that recirculate air from other zones without directly mixing it with outdoor air, dual-duct dual-fan VAV systems, and VAV systems with fan-powered terminal units. | | --- | --- | | | 2. Systems where total design exhaust airflow is more than 70 percent of total design outdoor air intake flow requirements. |

C403.6.6 Parallel-flow fan-powered VAV air terminal control. Parallel-flow fan-powered VAV air terminals shall have automatic controls configured to:

1. Turn off the terminal fan except when space heating is required or where required for ventilation.

2. Turn on the terminal fan as the first stage of heating before the heating coil is activated.

3. During heating for warmup or setback temperature control, either:

3.1. Operate the terminal fan and heating coil without primary air.

3.2. Reverse the terminal damper logic and provide heating from the central air handler by primary air.

C403.6.7 Reserved.

C403.6.8 Set points for direct digital control. For systems with direct digital control of individual zones reporting to the central control panel, the static pressure setpoint shall be reset based on the zone requiring the most pressure. In such cases, the set point is reset lower until one zone damper is nearly wide open. The direct digital controls shall be capable of monitoring zone damper positions or shall have an alternative method of indicating the need for static pressure that is configured to provide all of the following:

1. Automatically detecting any zone that excessively drives the reset logic.

2. Generating an alarm to the system operational location.

3. Allowing an operator to readily remove one or more zones from the reset algorithm.

C403.6.9 Static pressure sensor location. Static pressure sensors used to control VAV fans shall be located such that the controller setpoint is no greater than 1.2 inches w.c. (299 Pa). Where this results in one or more sensors being located downstream of major duct splits, not less than one sensor shall be located on each major branch to ensure that static pressure can be maintained in each branch.

| EXCEPTION: | Systems complying with Section C403.6.8. | | --- | --- |

History

• Statutory Authority: RCW 19.27A.020, 19.27A.025, 19.27A.160 and chapters 19.27A and 19.27 RCW. WSR 22-14-091, 23-12-101, and 23-20-021, § 51-11C-40360, filed 7/1/22, 6/7/23, and 9/25/23, effective 3/15/24. Statutory Authority: RCW 19.27A.025, 19.27A.045 and chapter 19.27 RCW. WSR 20-21-080, § 51-11C-40360, filed 10/19/20, effective 2/1/21. Statutory Authority: RCW 19.27A.020, 19.27A.025, 19.27A.160 and chapter 19.27 RCW. WSR 19-24-040, § 51-11C-40360, filed 11/26/19, effective 7/1/20. Statutory Authority: RCW 19.27A.025, 19.27A.045, 19.27A.160, and 19.27.074. WSR 17-10-062, § 51-11C-40360, filed 5/2/17, effective 6/2/17
• WSR 16-13-089, § 51-11C-40360, filed 6/15/16, effective 7/16/16. Statutory Authority: RCW 19.27A.025, 19.27A.160, and 19.27.074. WSR 16-03-072, § 51-11C-40360, filed 1/19/16, effective 7/1/16. Statutory Authority: RCW 19.27A.020, 19.27A.025 and chapters 19.27 and 34.05 RCW. WSR 13-04-056, § 51-11C-40360, filed 2/1/13, effective 7/1/13.

Wash. Admin. Code § 51-11C-403610 Section C403.6.10—High efficiency VAV systems.

C403.6.10 High efficiency variable air volume (VAV) systems. For HVAC systems subject to the requirements of Section C403.3.5 but utilizing Exception 2 of that section, a high efficiency multiple-zone VAV system may be provided without a separate parallel DOAS when the system is designed, installed, and configured to comply with all of the following criteria (this exception shall not be used as a substitution for a DOAS per Section C406.6):

1. Each VAV system must serve a minimum of 3,000 square feet (278.7 m2) and have a minimum of five VAV zones.

2. The VAV systems are provided with airside economizer per Section C403.5 without exceptions.

3. A direct-digital control (DDC) system is provided to control the VAV air handling units and associated terminal units per Section C403.4.11 regardless of sizing thresholds of Table C403.4.11.1.

4. Multiple-zone VAV systems with a minimum outdoor air requirement of 2,500 cfm (1180 L/s) or greater shall be equipped with a device capable of measuring outdoor airflow intake under all load conditions. The system shall be capable of increasing or reducing the outdoor airflow intake based on feedback from the VAV terminal units as required by Section C403.6.5, without exceptions, and Section C403.7.1 demand controlled ventilation.

5. Multiple-zone VAV systems with a minimum outdoor air requirement of 2,500 cfm (1180 L/s) or greater shall be equipped with a device capable of measuring supply airflow to the VAV terminal units under all load conditions.

6. In addition to meeting the zone isolation requirements of C403.2.1 a single VAV air handling unit shall not serve more than 50,000 square feet (4645 m2) unless a single floor is greater than 50,000 square feet (4645 m2) in which case the air handler is permitted to serve the entire floor.

7. The primary maximum cooling air for the VAV terminal units serving interior cooling load driven zones shall be sized for a supply air temperature that is a minimum of 5°F greater than the supply air temperature for the exterior zones in cooling.

8. Air terminal units with a minimum primary airflow setpoint of 50 percent or greater of the maximum primary airflow setpoint shall be sized with an inlet velocity of no greater than 900 feet per minute.

9. Fan system electrical input power (Fan kWdesign system) shall not exceed 90 percent of the fan power budget (Fan kWbudget) as defined by Section C403.8.1.1.

10. All fan powered VAV terminal units (series or parallel) shall be provided with electronically commutated motors. The DDC system shall be configured to vary the speed of the motor as a function of the heating and cooling load in the space. Minimum speed shall not be greater than 66 percent of design airflow required for the greater of heating or cooling operation. Minimum speed shall be used during periods of low heating and cooling operation and ventilation-only operation.

| EXCEPTION: | For series fan powered terminal units where the volume of primary air required to deliver the ventilation requirements at minimum speed exceeds the air that would be delivered at the speed defined above, the minimum speed setpoint shall be configured to exceed the value required to provide the required ventilation air. | | --- | --- |

11. Fan-powered VAV terminal units shall only be permitted at perimeter zones with an envelope heating load requirement. All other VAV terminal units shall be single duct terminal units.

| EXCEPTION: | Fan powered VAV terminal units are allowed at interior spaces with an occupant load greater than or equal to 25 people per 1000 square feet of floor area (as established in Table 403.3.1.1 of the International Mechanical Code) with demand control ventilation in accordance with Section C403.7.1. | | --- | --- |

12. When in occupied heating or in occupied deadband between heating and cooling all fan powered VAV terminal units shall be configured to reset the primary air supply setpoint, based on the VAV air handling unit outdoor air vent fraction, to the minimum ventilation airflow required per International Mechanical Code.

13. Spaces that are larger than 150 square feet (14 m2) and with an occupant load greater than or equal to 25 people per 1000 square feet (93 m2) of floor area (as established in Table 403.3.1.1 of the International Mechanical Code) shall be provided with all of the following features:

13.1. A dedicated VAV terminal unit capable of controlling the space temperature and minimum ventilation shall be provided.

13.2. Demand control ventilation (DCV) shall be provided that utilizes a carbon dioxide sensor to reset the ventilation setpoint of the VAV terminal unit from the design minimum to design maximum ventilation rate as required by Chapter 4 of the International Mechanical Code.

13.3. Occupancy sensors shall be provided that are configured to reduce the minimum ventilation rate to zero and setback room temperature setpoints by a minimum of 5°F, for both cooling and heating, when the space is unoccupied.

14. Dedicated data centers, computer rooms, electronic equipment rooms, telecom rooms, or other similar spaces with cooling loads greater than 5 watts/sf shall be provided with separate cooling systems to allow the VAV air handlers to turn off during unoccupied hours in the office space and to allow the supply air temperature reset to occur.

| EXCEPTION: | The VAV air handling unit and VAV terminal units may be used for secondary backup cooling when there is a failure of the primary HVAC system. | | --- | --- |

Additionally, computer rooms, electronic equipment rooms, telecom rooms, or other similar spaces shall be provided with airside economizer in accordance with Section 403.5 without using the exceptions to Section C403.5.

| EXCEPTION: | Heat recovery per Exception 9 of Section C403.5 may be in lieu of airside economizer for the separate, independent HVAC system. | | --- | --- |

15. HVAC system central heating or cooling plant will include a minimum of one of the following options:

15.1. VAV terminal units with hydronic heating coils connected to systems with hot water generation equipment limited to the following types of equipment: Gas-fired hydronic boilers with a thermal efficiency, Et, of not less than 92 percent, air-to-water heat pumps or heat recovery chillers. Hydronic heating coils shall be sized for a maximum entering hot water temperature of 120°F (48.9°C) for peak anticipated heating load conditions.

15.2. Chilled water VAV air handing units connected to systems with chilled water generation equipment with IPLV values more than 25 percent higher than the minimum part load efficiencies listed in Table C403.3.2(3), in the appropriate size category, using the same test procedures. Equipment shall be listed in the appropriate certification program to qualify. The smallest chiller or compressor in the central plant shall not exceed 20 percent of the total central plant cooling capacity or the chilled water system shall include thermal storage sized for a minimum of 20 percent of the total central cooling plant capacity.

16. The DDC system shall include a fault detection and diagnostics (FDD) system complying with the following:

16.1. The following temperature sensors shall be permanently installed to monitor system operation:

16.1.1. Outside air.

16.1.2. Supply air.

16.1.3. Return air.

16.2. Temperature sensors shall have an accuracy of ±2°F (1.1°C) over the range of 40°F to 80°F (4°C to 26.7°C).

16.3. The VAV air handling unit controller shall be configured to provide system status by indicating the following:

16.3.1. Free cooling available.

16.3.2. Economizer enabled.

16.3.3. Compressor enabled.

16.3.4. Heating enabled.

16.3.5. Mixed air low limit cycle active.

16.3.6. The current value of each sensor.

16.4. The VAV air handling unit controller shall be capable of manually initiating each operating mode so that the operation of compressors, economizers, fans and the heating system can be independently tested and verified.

16.5. The VAV air handling unit shall be configured to report faults to a fault management application able to be accessed by day-to-day operating or service personnel or annunciated locally on zone thermostats.

16.6. The VAV terminal unit shall be configured to report if the VAV inlet valve has failed by performing the following diagnostic check at a maximum interval of once a month:

16.6.1. Command VAV terminal unit primary air inlet valve closed and verify that primary airflow goes to zero.

16.6.2. Command VAV terminal unit primary air inlet valve to design airflow and verify that unit is controlling to within 10 percent of design airflow.

16.7. The VAV terminal unit shall be configured to report and trend when the zone is driving the following VAV air handling unit reset sequences. The building operator shall have the capability to exclude zones used in the reset sequences from the DDC control system graphical user interface:

16.7.1. Supply air temperature setpoint reset to lowest supply air temperature setpoint for cooling operation.

16.7.2. Supply air duct static pressure setpoint reset for the highest duct static pressure setpoint allowable.

16.8. The FDD system shall be configured to detect the following faults:

16.8.1. Air temperature sensor failure/fault.

16.8.2. Not economizing when the unit should be economizing.

16.8.3. Economizing when the unit should not be economizing.

16.8.4. Outdoor air or return air damper not modulating.

16.8.5. Excess outdoor air.

16.8.6. VAV terminal unit primary air valve failure.

History

• Statutory Authority: RCW 19.27A.045 and chapter 19.27A RCW. WSR 24-16-145, § 51-11C-403610, filed 8/7/24, effective 9/7/24. Statutory Authority: RCW 19.27A.020, 19.27A.025, 19.27A.160 and chapters 19.27A and 19.27 RCW. WSR 22-14-091, 23-12-101, and 23-20-021, § 51-11C-403610, filed 7/1/22, 6/7/23, and 9/25/23, effective 3/15/24. Statutory Authority: RCW 19.27A.025, 19.27A.045 and chapter 19.27 RCW. WSR 20-21-080, § 51-11C-403610, filed 10/19/20, effective 2/1/21. Statutory Authority: RCW 19.27A.020, 19.27A.025, 19.27A.160 and chapter 19.27 RCW. WSR 19-24-040, § 51-11C-403610, filed 11/26/19, effective 7/1/20.

Wash. Admin. Code § 51-11C-4037 Section C403.7—Ventilation and exhaust systems.

C403.7 Ventilation and exhaust systems. In addition to other requirements of Section C403 applicable to the provisions of ventilation air or the exhaust of air, ventilation and exhaust systems shall be in accordance with Sections C403.7.1 through C403.7.8.

History

• Statutory Authority: RCW 19.27A.020, 19.27A.025, 19.27A.160 and chapter 19.27 RCW. WSR 19-24-040, § 51-11C-4037, filed 11/26/19, effective 7/1/20.

Wash. Admin. Code § 51-11C-40371 Section C403.7.1—Demand control ventilation.

C403.7.1 Demand control ventilation.

C403.7.1.1 Spaces requiring demand control ventilation. Demand control ventilation (DCV) shall be provided for the following:

1. Spaces with ventilation provided by single-zone systems where an air economizer is provided to comply with Section C403.5.

2. Spaces with an occupant load greater than or equal to 15 people per 1000 square feet (93 m2) of floor area (as established in Table 403.3.1.1 of the International Mechanical Code)

or with an occupant outdoor airflow rate greater than or equal to 15 cfm/person, as established in Table 403.3.1.1 of the International Mechanical Code.

| EXCEPTIONS: | 1. Spaces including, but not limited to, dining areas, where more than 75 percent of the space design outdoor airflow is transfer air required for makeup air supplying an adjacent commercial kitchen. | | --- | --- | | | 2. Spaces with one of the following occupancy classifications as defined in Table 403.3.1.1 of the International Mechanical Code: Correctional cells, educational laboratories, barbers, beauty and nail salons, and bowling alley seating. | | | 3. Dormitory sleeping areas with fewer than five occupants per space. | | | 4. Spaces with ventilation not provided by a single-zone system where the design occupant component outdoor airflow is less than 100 cfm (23.6 L/s), or 200 cfm (47.2 L/s) with system having energy recovery with minimum 60 percent sensible effectiveness. Design occupant component outdoor airflow shall be calculated as the product of the design number of occupants in the space and the people outdoor airflow rate per occupant (Rp) as established in Table 403.3.1.1 of the International Mechanical Code. | | | 5. Spaces with ventilation not provided by a single-zone system where the total system design outdoor airflow is less than 750 cfm (354 L/s), or 1500 cfm (708 L/s) with system having energy recovery with minimum 60 percent sensible effectiveness. |

C403.7.1.2 Demand control ventilation design. Each space required to have demand control ventilation shall have equipment and controls capable of and configured to automatically change the quantity of outdoor air supplied to the space based upon the output of a CO2 sensor. System outdoor air intake shall be adjusted from peak design levels in response to changes in outdoor air required in the spaces served by the system. This adjustment shall be accomplished by variable speed fan control.

| EXCEPTION: | These system types may use other means of adjusting outdoor air: | | --- | --- | | | 1. Single zone systems designed to recirculate return air. | | | 2. Systems with total supply air less than 1500 cfm (708 L/s). |

History

• Statutory Authority: RCW 19.27A.020, 19.27A.025, 19.27A.160 and chapters 19.27A and 19.27 RCW. WSR 22-14-091, 23-12-101, and 23-20-021, § 51-11C-40371, filed 7/1/22, 6/7/23, and 9/25/23, effective 3/15/24. Statutory Authority: RCW 19.27A.020, 19.27A.025, 19.27A.160 and chapter 19.27 RCW. WSR 19-24-040, § 51-11C-40371, filed 11/26/19, effective 7/1/20.

Wash. Admin. Code § 51-11C-40372 Section C403.7.2—Occupancy sensors.

C403.7.2 Occupancy sensors. Classrooms, gyms, auditoriums, conference rooms, and other spaces with an occupant load greater than or equal to 25 people per 1000 square feet (93 m2) of floor area (as established in Table 403.3.1.1 of the International Mechanical Code) that are larger than 500 square feet of floor area shall have occupancy sensor control that will either close outside air dampers, close ventilation supply dampers or turn off ventilation equipment when the space is unoccupied except where equipped with another means to automatically reduce outside air intake below design rates when spaces are partially occupied.

| EXCEPTIONS: | 1. Spaces with one of the following occupancy categories (as defined by the International Mechanical Code): | | --- | --- | | | 1.1. Correctional cells. | | | 1.2. Daycare sickrooms. | | | 1.3. Science labs. | | | 1.4. Barbers. | | | 1.5. Beauty and nail salons. | | | 1.6. Bowling alley seating. | | | 2. When the space is unoccupied during occupied building hours, a ventilation rate equal to or less than the zone outdoor airflow as defined in Section 403.3.1.1.1 of the International Mechanical Code with a zone population of zero. |

History

• Statutory Authority: RCW 19.27A.020, 19.27A.025, 19.27A.160 and chapter 19.27 RCW. WSR 19-24-040, § 51-11C-40372, filed 11/26/19, effective 7/1/20.

Wash. Admin. Code § 51-11C-40373 Section C403.7.3—Ventilation air heating control.

C403.7.3 Ventilation air heating control. For ventilation air units with supplemental heating capacity that operate in conjunction with zone heating and cooling systems, supplemental heating shall not warm ventilation supply air to a temperature greater than 55°F (13°C).

History

• Statutory Authority: RCW 19.27A.020, 19.27A.025, 19.27A.160 and chapters 19.27A and 19.27 RCW. WSR 22-14-091, 23-12-101, and 23-20-021, § 51-11C-40373, filed 7/1/22, 6/7/23, and 9/25/23, effective 3/15/24. Statutory Authority: RCW 19.27A.020, 19.27A.025, 19.27A.160 and chapter 19.27 RCW. WSR 19-24-040, § 51-11C-40373, filed 11/26/19, effective 7/1/20.

Wash. Admin. Code § 51-11C-40374 Section C403.7.4—HVAC serving guestrooms.

C403.7.4 Automatic control of HVAC systems serving guestrooms. In Group R-1 buildings containing more than 50 guestrooms, each guestroom shall be provided with controls complying with the provisions of Sections C403.7.4.1 and C403.7.4.2. Card key controls comply with these requirements.

C403.7.4.1 Temperature setpoint controls. Controls shall be provided on each HVAC system that are capable of and configured with three modes of temperature control.

1. When the guestroom is rented but unoccupied, the controls shall automatically raise the cooling setpoint and lower the heating setpoint by not less than 4°F (2°C) from the occupant setpoint within 30 minutes after the occupants have left the guestroom.

2. When the guestroom is unrented and unoccupied, the controls shall automatically raise the cooling setpoint to not lower than 80°F (27°C) and lower the heating setpoint to not higher than 60°F (16°C). Unrented and unoccupied guestroom mode shall be initiated within 16 hours of the guestroom being continuously occupied or where a networked guestroom control system indicates that the guestroom is unrented and the guestroom is unoccupied for more than 20 minutes. A networked guestroom control system that is capable of returning the thermostat setpoints to default occupied setpoints 60 minutes prior to the time a guestroom is scheduled to be occupied is not precluded by this section. Cooling that is capable of limiting relative humidity with a setpoint not lower than 65 percent relative humidity during unoccupied periods is not precluded by this section.

3. When the guestroom is occupied, HVAC set points shall return to their occupied set point once occupancy is sensed.

C403.7.4.2 Ventilation controls. Controls shall be provided on each HVAC system that are capable of and configured to automatically turn off the ventilation and exhaust fans within 20 minutes of the occupants leaving the guestroom or isolation devices shall be provided to each guestroom that are capable of automatically shutting off the supply of outdoor air to and exhaust air from the guestroom.

| EXCEPTION: | Guestroom ventilation systems are not precluded from having an automatic daily preoccupancy purge cycle that provides daily outdoor air ventilation during unrented periods at the design ventilation rate for 60 minutes, or at a rate and duration equivalent to one air change. | | --- | --- |

History

• Statutory Authority: RCW 19.27A.020, 19.27A.025, 19.27A.160 and chapters 19.27A and 19.27 RCW. WSR 22-14-091, 23-12-101, and 23-20-021, § 51-11C-40374, filed 7/1/22, 6/7/23, and 9/25/23, effective 3/15/24. Statutory Authority: RCW 19.27A.025, 19.27A.045 and chapter 19.27 RCW. WSR 20-21-080, § 51-11C-40374, filed 10/19/20, effective 2/1/21. Statutory Authority: RCW 19.27A.020, 19.27A.025, 19.27A.160 and chapter 19.27 RCW. WSR 19-24-040, § 51-11C-40374, filed 11/26/19, effective 7/1/20.

Wash. Admin. Code § 51-11C-40375 Section C403.7.5—Loading dock and garage ventilation system controls.

C403.7.5 Loading dock, motor vehicle repair garage, and parking garage ventilation system controls. Mechanical ventilation systems for loading docks, motor vehicle repair garages, and parking garages shall be designed to exhaust the airflow rates (maximum and minimum) determined in accordance with the International Mechanical Code.

Ventilation systems shall be equipped with a control device that operates the system automatically by means of carbon monoxide detectors applied in conjunction with nitrogen dioxide detectors. Controllers shall be configured to shut off fans or modulate fan speed to 20 percent or less of design capacity, or intermittently operate fans less than 20 percent of the occupied time or as required to maintain acceptable contaminant levels in accordance with the International Mechanical Code provisions.

Ventilation systems with total ventilation system motor nameplate horsepower exceeding 5 hp (3.7 kW) at fan system design conditions and those with heating and/or cooling shall have controls and devices that modulate fan speed and result in fan motor demand of no more than 30 percent of design wattage at 50 percent of the design airflow.

Gas sensor controllers used to activate the exhaust ventilation system shall stage or modulate fan speed upon detection of specified gas levels. All equipment used in sensor controlled systems shall be designed for the specific use and installed in accordance with the manufacturer's recommendations. The system shall be arranged to operate automatically by means of carbon monoxide detectors applied in conjunction with nitrogen dioxide detectors. Parking garages, repair garages, and loading docks shall be equipped with a controller and a full array of carbon monoxide (CO) sensors set to maintain levels of carbon monoxide below 35 parts per million (ppm). Additionally, a full array of nitrogen dioxide detectors shall be connected to the controller set to maintain the nitrogen dioxide level below the OSHA standard for eight hour exposure.

Spacing and location of the sensors shall be installed in accordance with manufacturer recommendations.

C403.7.5.1 System activation devices for loading docks. Ventilation systems for enclosed loading docks shall operate continuously during unoccupied hours at 50 percent or less of design capacity and shall be activated to the full required ventilation rate by one of the following:

1. Gas sensors installed in accordance with the International Mechanical Code; or

2. Occupant detection sensors used to activate the system that detects entry into the loading area along both the vehicle and pedestrian pathways.

C403.7.5.2 System activation devices for parking garages. Ventilation systems for enclosed parking garages shall be activated by gas sensors.

History

• Statutory Authority: RCW 19.27A.020, 19.27A.025, 19.27A.160 and chapters 19.27A and 19.27 RCW. WSR 22-14-091, 23-12-101, and 23-20-021, § 51-11C-40375, filed 7/1/22, 6/7/23, and 9/25/23, effective 3/15/24. Statutory Authority: RCW 19.27A.020, 19.27A.025, 19.27A.160 and chapter 19.27 RCW. WSR 19-24-040, § 51-11C-40375, filed 11/26/19, effective 7/1/20.

Wash. Admin. Code § 51-11C-40376 Section C403.7.6—Energy recovery ventilation systems.

C403.7.6 Energy recovery ventilation systems. Energy recovery ventilation systems shall be provided as specified in Sections C403.7.6.1 and C403.7.6.2.

C403.7.6.1 Ventilation for Group R-2 occupancy. For all Group R-2 dwelling and sleeping units, a balanced ventilation system with heat recovery system with minimum 60 percent sensible recovery effectiveness shall provide outdoor air directly to each habitable space in accordance with the International Mechanical Code. The ventilation system shall allow for the design flow rates to be tested and verified at each habitable space as part of the commissioning process in accordance with Section C408.2.2. The return/exhaust air stream temperature for heat recovery device selection shall be 70°F (21°C), or as calculated by the registered design professional.

| EXCEPTION: | Heat recovery and energy recovery ventilators (H/ERV) that are rated and listed in accordance with HVI 920 can demonstrate compliance with the sensible recovery effectiveness requirement using the adjusted sensible recovery effectiveness (ASRE) rating of the equipment at 32°F test conditions. Applied flow rate for ASRE rating shall be no less than the design flow rate or the closest value interpolated between two listed flow rates. | | --- | --- |

C403.7.6.2 Spaces other than Group R-2 dwelling units. Any system serving a space other than a Group R-2 dwelling or sleeping unit with minimum outside air requirements at design conditions greater than 5,000 cfm or any system where the system's supply airflow rate exceeds the value listed in Tables C403.7.6(1) and C403.7.6(2), based on the climate zone and percentage of outdoor airflow rate at design conditions, shall include an energy recovery system. Table C403.7.6(1) shall be used for all ventilation systems that operate less than 8,000 hours per year, and Table C403.7.6(2) shall be used for all ventilation systems that operate 8,000 hours or more per year. The energy recovery system shall provide a 68 percent minimum sensible recovery effectiveness or have an enthalpy recovery ratio of not less than 60 percent at design conditions. Where an air economizer is required, the energy recovery system shall include a bypass of the energy recovery media for both the outdoor air and exhaust air or return air dampers and controls which permit operation of the air economizer as required by Section C403.5. Where a single room or space is supplied by multiple units, the aggregate ventilation (cfm) of those units shall be used in applying this requirement. The return/exhaust air stream temperature for heat recovery device selection shall be 70°F (21°C) at 30 percent relative humidity, or as calculated by the registered design professional.

| EXCEPTION: | An energy recovery ventilation system shall not be required in any of the following conditions: | | --- | --- | | | 1. Where energy recovery systems are restricted per Section 514 of the International Mechanical Code to sensible energy, recovery shall comply with one of the following: | | | 1.1. Kitchen exhaust systems where they comply with Section C403.7.7.1. | | | 1.2. Laboratory fume hood systems where they comply with Exception 2 of Section C403.7.6. | | | 1.3. Other sensible energy recovery systems with the capability to provide a change in dry-bulb temperature of the outdoor air supply of not less than 50 percent of the difference between the outdoor air and the return air dry-bulb temperatures, at design conditions. | | | 2. Laboratory fume hood systems that include at least one of the following features and also comply with Section C403.7.7.2: | | | 2.1. Variable-air-volume hood exhaust and room supply systems configured to reduce exhaust and makeup air volume to 50 percent or less of design values. | | | 2.2. Direct makeup (auxiliary) air supply equal to at least 75 percent of the exhaust rate, heated no warmer than 2°F (1.1°C) above room setpoint, cooled to no cooler than 3°F (1.7°C) below room setpoint, no humidification added, and no simultaneous heating and cooling used for dehumidification control. | | | 3. Systems serving spaces that are heated to less than 60°F (15.5°C) and are not cooled. | | | 4. Where more than 60 percent of the outdoor air heating energy is provided from site-recovered energy. | | | 5. Systems exhausting toxic, flammable, paint or corrosive fumes or dust. | | | 6. Cooling energy recovery. | | | 7. Systems requiring dehumidification that employ energy recovery in series with the cooling coil. | | | 8. Multiple-zone systems where the supply airflow rate is less than the values specified in Tables C403.7.6 (1) and (2), for the corresponding percent of outdoor air. Where a value of NR is listed, energy recovery shall not be required. | | | 9. Equipment which meets the requirements of Section C403.9.2.4. | | | 10. Systems serving Group R-1 dwelling or sleeping units where the largest source of air exhausted at a single location at the building exterior is less than 25 percent of the design outdoor air flow rate. |

Table C403.7.6(1)

Energy Recovery Requirement

(Ventilation systems operating less than 8,000 hours per year)

| Percent (%) Outdoor Air at Full Design Airflow Rate | | | | | | | | | | --- | --- | --- | --- | --- | --- | --- | --- | --- | | Climate zone | ≥ 10% and < 20% | ≥ 20% and < 30% | ≥ 30% and < 40% | ≥ 40% and < 50% | ≥ 50% and < 60% | ≥ 60% and < 70% | ≥ 70% and < 80% | ≥ 80% | | Design Supply Fan Airflow Rate (cfm) | | | | | | | | | | 4C, 5B | NR | NR | NR | NR | NR | NR | ≥ 5000 | ≥ 5000 | | NR = Not required. | | | | | | | | |

Table C403.7.6(2)

Energy Recovery Requirement

(Ventilation systems operating not less than 8,000 hours per year)

| Percent (%) Outdoor Air at Full Design Airflow Rate | | | | | | | | | | --- | --- | --- | --- | --- | --- | --- | --- | --- | | Climate zone | ≥ 10% and < 20% | ≥ 20% and < 30% | ≥ 30% and < 40% | ≥ 40% and < 50% | ≥ 50% and < 60% | ≥ 60% and < 70% | ≥ 70% and < 80% | ≥ 80% | | Design Supply Fan Airflow Rate (cfm) | | | | | | | | | | 4C | NR | ≥ 19500 | ≥ 9000 | ≥ 5000 | ≥ 4000 | ≥ 3000 | ≥ 1500 | ≥ 120 | | 5B | ≥ 2500 | ≥ 2000 | ≥ 1000 | ≥ 500 | ≥ 140 | ≥ 120 | ≥ 100 | ≥ 80 | | NR = Not required. | | | | | | | | |

History

• Statutory Authority: RCW 19.27A.045 and chapter 19.27A RCW. WSR 24-16-145, § 51-11C-40376, filed 8/7/24, effective 9/7/24. Statutory Authority: RCW 19.27A.020, 19.27A.025, 19.27A.160 and chapters 19.27A and 19.27 RCW. WSR 22-14-091, 23-12-101, and 23-20-021, § 51-11C-40376, filed 7/1/22, 6/7/23, and 9/25/23, effective 3/15/24. Statutory Authority: RCW 19.27A.020, 19.27A.025, 19.27A.160 and chapter 19.27 RCW. WSR 19-24-040, § 51-11C-40376, filed 11/26/19, effective 7/1/20.

Wash. Admin. Code § 51-11C-40377 Section C403.7.7—Exhaust systems.

C403.7.7 Exhaust systems.

C403.7.7.1 Kitchen exhaust systems.

C403.7.7.1.1 Replacement air. Replacement air introduced directly into the exhaust hood cavity shall not be greater than 10 percent of the hood exhaust airflow rate.

C403.7.7.1.2 Kitchen exhaust hood certification and maximum airflow. Where a kitchen or kitchen/dining facility has a total kitchen hood exhaust airflow rate that is greater than 2,000 cfm, each hood shall be a factory built commercial exhaust hood listed by a nationally recognized testing laboratory in compliance with UL 710 and each hood shall have a maximum exhaust rate as specified in Table C403.7.7.1.2. Where a single hood, or hood section, is installed over appliances with different duty ratings, the maximum allowable flow rate for the hood or hood section shall be based on the requirements for the highest appliance duty rating under the hood or hood section.

| EXCEPTION: | Type II dishwasher exhaust hoods that have an exhaust airflow of 1000 cfm or less. | | --- | --- |

Table C403.7.7.1.2

Maximum Net Exhaust Flow Rate,

CFM Per Linear Foot of Hood Length

| Type of Hood | Light-duty Equipment | Medium-duty Equipment | Heavy-duty Equipment | Extra-heavy-duty Equipment | | --- | --- | --- | --- | --- | | Wall-mounted canopy | 140 | 210 | 280 | 385 | | Single island | 280 | 350 | 420 | 490 | | Double island (per side) | 175 | 210 | 280 | 385 | | Eyebrow | 175 | 175 | NA | NA | | Backshelf/pass-over | 210 | 210 | 280 | NA |

| For SI: | 1 cfm = 0.4719 L/s; 1 foot = 305 mm | | --- | --- | | NA = Not allowed | |

C403.7.7.1.3 Kitchen exhaust hood system. Kitchen exhaust hood systems serving Type I exhaust hoods shall be provided with demand control kitchen ventilation (DCKV) controls where a kitchen or kitchen/dining facility has a total kitchen hood exhaust airflow rate greater than 2000 cfm. DCKV systems shall be configured to provide a minimum of 50 percent reduction in exhaust and replacement air system airflows in response to appliance operation and to maintain full capture and containment of smoke, effluent and combustion products during cooking and idle operation.

| EXCEPTIONS: | 1. UL 710 listed exhaust hoods that have a design maximum exhaust airflow rate no greater than 250 cfm per linear foot of hood that serve kitchen or kitchen/dining facilities with a total kitchen hood exhaust airflow rate less than 5000 cfm. | | --- | --- | | | 2. An energy recovery device is installed on the kitchen exhaust with a sensible heat recovery effectiveness of not less than 40 percent or not less than 50 percent of the total exhaust hood airflow. |

C403.7.7.2 Laboratory exhaust systems. Buildings with laboratory exhaust systems having a total exhaust rate greater than 5,000 cfm (2360 L/s) shall include heat recovery systems to precondition replacement air from laboratory exhaust. The heat recovery system shall be capable of increasing the outside air supply temperature at design heating conditions by 25°F (13.9°C). A provision shall be made to bypass or control the heat recovery system to permit air economizer operation as required by Section C403.5.

| EXCEPTIONS: | 1. Variable air volume laboratory exhaust and room supply systems configured to reduce exhaust and makeup air volume to 50 percent or less of design values; or | | --- | --- | | | 2. Direct makeup (auxiliary) air supply equal to at least 75 percent of the exhaust rate, heated no warmer than 2°F (1.1°C) below room setpoint, cooled to no cooler than 3°F (1.7°C) above room setpoint, no humidification added, and no simultaneous heating and cooling used for dehumidification control; or | | | 3. Combined energy reduction method: VAV exhaust and room supply system configured to reduce exhaust and makeup air volumes and a heat recovery system to precondition makeup air from laboratory exhaust that when combined will produce the same energy reduction as achieved by a heat recovery system with a 50 percent sensible recovery effectiveness as required above. For calculation purposes, the heat recovery component can be assumed to include the maximum design supply airflow rate at design conditions. The combined energy reduction (QER) shall meet the following: |

| QER | ≥ | QMIN | | | --- | --- | --- | --- | | QMIN | = | CFMS • (TR - TO) • 1.1 • 0.6 | | | QER | = | CFMS • (TR - TO) • 1.1(A + B)/100 | | | Where: | | | | | | QMIN | = | Energy recovery at 60 percent sensible effectiveness (Btu/h) | | | QER | = | Combined energy reduction (Btu/h) | | | CFMS | = | The maximum design supply airflow rate to conditioned spaces served by the system in cubic feet per minute | | | TR | = | Space return air dry-bulb at winter design conditions | | | TO | = | Outdoor air dry-bulb at winter design conditions | | | A | = | Percentage that the exhaust and makeup air volumes can be reduced from design conditions | | | B | = | Percentage sensible heat recovery effectiveness |

C403.7.7.3 Transfer air. Conditioned supply air delivered to any space with mechanical exhaust shall not exceed the greater of:

1. The supply flow required to meet the space heating or cooling load;

2. The ventilation rate required by the authority having jurisdiction, the facility environmental health and safety department, or Section C403.2.2; or

3. The mechanical exhaust flow minus the available transfer air from conditioned spaces or return air plenums that at their closest point are within 15 feet of each other on the same floor that are not in different smoke or fire compartments. Available transfer air is that portion of outdoor ventilation air that:

3.1. Is not required to satisfy other exhaust needs;

3.2. Is not required to maintain pressurization of other spaces; and

3.3. Is transferable according to applicable codes and standards and per the International Mechanical Code.

| EXCEPTIONS: | 1. Laboratories classified as biosafety level 3 or higher. | | --- | --- | | | 2. Vivarium spaces. | | | 3. Spaces that are required by applicable codes and standards to be maintained at positive pressure relative to adjacent spaces. For spaces taking this exception, any transferable air that is not directly transferred shall be made available to the associated air-handling unit and shall be used whenever economizer or other options do not save more energy. | | | 4. Spaces where the demand for transfer air may exceed the available transfer airflow rate and where the spaces have a required negative pressure relationship. For spaces taking this exception, any transferable air that is not directly transferred shall be made available to the associated air-handling unit and shall be used whenever economizer or other options do not save more energy. |

History

• Statutory Authority: RCW 19.27A.020, 19.27A.025, 19.27A.160 and chapters 19.27A and 19.27 RCW. WSR 22-14-091, 23-12-101, and 23-20-021, § 51-11C-40377, filed 7/1/22, 6/7/23, and 9/25/23, effective 3/15/24. Statutory Authority: RCW 19.27A.020, 19.27A.025, 19.27A.160 and chapter 19.27 RCW. WSR 19-24-040, § 51-11C-40377, filed 11/26/19, effective 7/1/20.

Wash. Admin. Code § 51-11C-40378 Section C403.7.8—Shutoff dampers.

C403.7.8 Shutoff dampers. Mechanical openings shall be provided with shutoff dampers in accordance with Sections C403.7.8.1 through C403.7.8.4.

C403.7.8.1 Shutoff dampers for building isolation. Outdoor air supply, exhaust openings and relief outlets and stairway and elevator hoistway shaft vents shall be provided with Class I motorized dampers. See Sections C403.10.1 and C403.10.2 for ductwork insulation requirements upstream and downstream of the shutoff damper.

| EXCEPTIONS: | 1. Gravity (nonmotorized) dampers shall be permitted in lieu of motorized dampers as follows: | | --- | --- | | | 1.1. Relief dampers serving systems less than 5,000 cfm total supply shall be permitted in buildings less than three stories in height. | | | 1.2. Gravity (nonmotorized) dampers where the design outdoor air intake or exhaust capacity does not exceed 300 cfm (142 L/s). | | | 1.3. Systems serving areas which require continuous operation for 24/7 occupancy schedules. | | | 2. Shutoff dampers are not required in: | | | 2.1. Combustion air intakes. | | | 2.2. Systems serving areas which require continuous operation in animal hospitals, kennels and pounds, laboratories, and Group H, I and R occupancies. | | | 2.3. Subduct exhaust systems or other systems that are required to operate continuously by the International Mechanical Code. | | | 2.4. Type I grease exhaust systems or other systems where dampers are prohibited by the International Mechanical Code to be in the airstream. | | | 2.5. Unconditioned stairwells or unconditioned elevator hoistway shafts that are only connected to unconditioned spaces. |

C403.7.8.2 Shutoff dampers for return air. Return air openings used for airside economizer operation shall be equipped with Class I motorized dampers.

C403.7.8.3 Damper leakage rating. Class 1 dampers shall have a maximum leakage rate of 4 cfm/ft2 (20.3 L/s x m2) at 1.0 inch water gauge (w.g.) (249 Pa) when tested in accordance with AMCA 500D and shall be labeled by an approved agency for such purpose. Gravity (nonmotorized) dampers shall have an air leakage rate not greater than 20 cfm/ft2 where not less than 24 inches (610 mm) in either dimension and 40 cfm/ft2 where less than 24 inches in either dimension. The rate of air leakage shall be determined at 1.0 inch w.g. (249 Pa) when tested in accordance with AMCA 500D for such purpose. The dampers shall be labeled by an approved agency. Gravity dampers for ventilation air intakes shall be protected from direct exposure to wind.

| EXCEPTIONS: | 1. Gravity (nonmotorized) dampers are not required to be tested to verify the air leakage rating when installed in exhaust systems where the exhaust capacity does not exceed 400 cfm and the gravity damper is provided with a gasketed seal. | | --- | --- | | | 2. Motorized dampers on return air openings in unitary packaged equipment that have the minimum leakage rate available from the manufacturer. |

C403.7.8.4 Damper actuation. Outdoor air intake, relief and exhaust shutoff dampers shall be installed with automatic controls configured to close when the systems or spaces served are not in use or during unoccupied period warm-up and setback operation, unless the systems served require outdoor or exhaust air in accordance with the International Mechanical Code or the dampers are opened to provide intentional economizer cooling. Stairway and elevator hoistway shaft vent dampers shall be installed with automatic controls configured to open upon the activation of any fire alarm initiating device of the building's fire alarm system or the interruption of power to the damper.

History

• Statutory Authority: RCW 19.27A.020, 19.27A.025, 19.27A.160 and chapters 19.27A and 19.27 RCW. WSR 22-14-091, 23-12-101, and 23-20-021, § 51-11C-40378, filed 7/1/22, 6/7/23, and 9/25/23, effective 3/15/24. Statutory Authority: RCW 19.27A.020, 19.27A.025, 19.27A.160 and chapter 19.27 RCW. WSR 19-24-040, § 51-11C-40378, filed 11/26/19, effective 7/1/20.

Wash. Admin. Code § 51-11C-4038 Section C403.8—Fan and fan controls.

C403.8 Fan and fan controls. Fans in HVAC systems shall comply with Sections C403.8.1 through C403.8.5.1.

The airflow requirements of Section C403.8.5.1 shall apply to all fan motors. Low capacity ventilation fans shall also comply with Section C403.8.4.

C403.8.1 Fan System. Each fan system that includes at least one fan or fan array with fan electrical input power ≥ 1 kW, moving air into, out of, or between conditioned spaces or circulating air for the purpose of conditioning air within a space shall comply with Sections C403.8.1.1 through C403.8.1.2.

C403.8.1.1 Determining fan power budget. For each fan system, the fan system electrical input power (Fan kWdesign,system) determined in accordance with Section C403.8.1.2 at the fan system airflow shall not exceed Fan kWbudget. Calculate fan power budget (Fan kWbudget) for each fan system as follows:

1. Determine the fan system airflow and choose the appropriate table(s) for fan power allowance.

1.1. For single-cabinet fan systems, use the fan system airflow and the power allowances in both Table C403.8.1.1(1) and Table C403.8.1.1(2).

1.2. For supply-only fan systems, use the fan system airflow and power allowances in Table C403.8.1.1(1).

1.3. For relief fan systems, use the design relief airflow and the power allowances in Table C403.8.1.1(2).

1.4. For exhaust, return and transfer fan systems, use the fan system airflow and the power allowances in Table C403.8.1.1(2).

1.5. For complex and DOAS with energy recovery fan systems, separately calculate the fan power allowance for the supply and return/exhaust systems and sum them. For the supply airflow, use supply airflow at the fan system design conditions, and the power allowances in Table C403.8.1.1(1). For the return/exhaust airflow, use return/exhaust airflow at the fan system design conditions, and the power allowances in Table C403.8.1.1(2).

2. For each fan system, determine the components included in the fan system and sum the fan power allowances of those components. All fan systems shall include the system base allowance. If, for a given component, only a portion of the fan system airflow passes through the component, calculate the fan power allowance for that component in accordance with Equation 4-11:

(Equation 4-11)

| FPAadj | = | (Qcomp/Qsys) × FPAcomp | | --- | --- | --- |

| Where: | | | | | --- | --- | --- | --- | | | FPAadj | = | The corrected fan power allowance for the component in W/cfm. | | | Qcomp | = | The airflow through component in cfm. | | | Qsys | = | The fan system airflow in cfm. | | | FPAcomp | = | The fan power allowance of the component from Table C403.8.1.1(1) or Table C403.8.1.1(2). |

3. Multiply the fan system airflow by the sum of the fan power allowances for the fan system.

4. Divide by 1,000 to convert to Fan kWbudget.

5. For building sites at elevations greater than 3,000 feet, multiply Fan kWbudget by 0.896.

Table C403.8.1.1(1)

Supply Fan Power Allowances (W/CFM)

| Airflow | Multi-Zone VAV Systemsa ≤ 5,000 cfm | Multi-Zone VAV Systemsa ˃ 5,000 and ≤ 10,000 cfm | Multi-Zone VAV Systemsa ˃ 10,000 cfm | All Other Fan Systems ≤ 5,000 cfm | All Other Fan Systems ˃ 5,000 and ≤ 10,000 cfm | All Other Fan Systems ˃ 10,000 cfm | | --- | --- | --- | --- | --- | --- | --- | | Supply system base allowance for AHU serving spaces ≤ 6 floors away | 0.395 | 0.453 | 0.413 | 0.232 | 0.256 | 0.236 | | Supply system base allowance for AHU serving spaces ˃ 6 floors away | 0.508 | 0.548 | 0.501 | 0.349 | 0.356 | 0.325 | | MERV 13 to MERV 16 Filter upstream of thermal conditioning equipment (two-times the clean filter pressure drop)b | 0.136 | 0.114 | 0.105 | 0.139 | 0.120 | 0.107 | | MERV 13 to MERV 16 Final filter downstream of thermal conditioning equipment (two-times the clean filter pressure drop)b | 0.225 | 0.188 | 0.176 | 0.231 | 0.197 | 0.177 | | Filtration allowance for ˃ MERV 16 or HEPA Filter (two-times the clean filter pressure drop)b | 0.335 | 0.280 | 0.265 | 0.342 | 0.292 | 0.264 | | Central hydronic heating coil allowance | 0.046 | 0.048 | 0.052 | 0.046 | 0.050 | 0.054 | | Electric heat allowance | 0.046 | 0.038 | 0.035 | 0.046 | 0.040 | 0.036 | | Gas heat allowance | 0.069 | 0.057 | 0.070 | 0.058 | 0.060 | 0.072 | | Hydronic/DX cooling coil or heat pump coil (wet) allowancec | 0.135 | 0.114 | 0.105 | 0.139 | 0.120 | 0.107 | | Solid or liquid desiccant system allowance | 0.157 | 0.132 | 0.123 | 0.163 | 0.139 | 0.124 | | Reheat coil for dehumidification allowance | 0.045 | 0.038 | 0.035 | 0.046 | 0.040 | 0.036 | | Allowance for evaporative humidifier/cooler in series with a cooling coil. Value shown is allowed W/cfm per 1.0 inches of water gauge (in.w.g.). Determine pressure loss (in.w.g.) at 400 fpm or maximum velocity allowed by the manufacturer, whichever is lessd | 0.224 | 0.188 | 0.176 | 0.231 | 0.197 | 0.177 | | Allowance for 100% Outdoor air systeme | 0.000 | 0.000 | 0.000 | 0.070 | 0.100 | 0.107 | | Energy recovery allowance for 0.50 ≤ ERR <0.55f | 0.135 | 0.114 | 0.105 | 0.139 | 0.120 | 0.107 | | Energy recovery allowance for 0.55 ≤ ERR <0.60f | 0.160 | 0.134 | 0.124 | 0.165 | 0.141 | 0.126 | | Energy recovery allowance for 0.60 ≤ ERR <0.65f | 0.184 | 0.155 | 0.144 | 0.190 | 0.163 | 0.146 | | Energy recovery allowance for 0.65 ≤ ERR <0.70f | 0.208 | 0.175 | 0.163 | 0.215 | 0.184 | 0.165 | | Energy recovery allowance for 0.70 ≤ ERR <0.75f | 0.232 | 0.196 | 0.183 | 0.240 | 0.205 | 0.184 | | Energy recovery allowance for 0.75 ≤ ERR <0.80f | 0.257 | 0.216 | 0.202 | 0.264 | 0.226 | 0.203 | | Energy recovery allowance for ERR ≥ 0.80f | 0.281 | 0.236 | 0.222 | 0.289 | 0.247 | 0.222 | | Coil runaround loop | 0.135 | 0.114 | 0.105 | 0.139 | 0.120 | 0.107 | | Allowance for Gas phase filtration required by code or accredited standard. Value shown is allowed W/cfm per 1.0 in. wg air pressure dropd | 0.224 | 0.188 | 0.176 | 0.231 | 0.197 | 0.177 | | Economizer damper return | 0.045 | 0.038 | 0.035 | 0.046 | 0.040 | 0.036 | | Air blender allowance | 0.045 | 0.038 | 0.035 | 0.046 | 0.040 | 0.036 | | Sound attenuation section [fans serving spaces with design background noise goals below NC35] | 0.034 | 0.029 | 0.026 | 0.035 | 0.030 | 0.027 | | Deduction for systems that feed a terminal unit with a fan with electrical input power < 1kW | -0.100 | -0.100 | -0.100 | -0.100 | -0.100 | -0.100 | | Low-turndown single-zone VAV fan systemsg | 0.000 | 0.000 | 0.000 | 0.070 | 0.100 | 0.089 |

| a | See definition of FAN SYSTEM, MULTI-ZONE VARIABLE AIR VOLUME (VAV). | | --- | --- | | b | Filter fan power allowance can only be counted once per fan system, except fan systems in health care facilities, which can claim one of the MERV 13 to 16 filter allowances and the HEPA filter allowance if both are included in the fan system. | | c | Health care facilities can claim this fan power allowance twice per fan system where coil design leaving air temperature is less than 44⁰F. | | d | Power allowance requires further calculation by multiplying the actual inches of water gauge (in.w.g.) of the device/component by the w/cfm in Table C403.8.1(1). | | e | The 100% outdoor air system must serve 3 or more HVAC zones and airflow during noneconomizer operating periods must comply with Section C403.2.2.1. | | f | Enthalpy Recovery Ratio (ERR) calculated per ANSI/ASHRAE 84-2020. | | g | A low-turndown single-zone VAV fan system must be capable of and configured to reduce airflow to 50 percent of design airflow and use no more than 30 percent of the design wattage at that airflow. No more than 10 percent of the design load served by the equipment shall have fixed loads. |

Table C403.8.1.1(2)

Exhaust, Return, Relief, Transfer Fan Power Allowances (W/CFM)

| Airflow | Multi-Zone VAV Systemsa ≤ 5,000 cfm | Multi-Zone VAV Systemsa ˃ 5,000 and ≤ 10,000 cfm | Multi-Zone VAV Systemsa ˃ 10,000 cfm | All Other Fan Systems ≤ 5,000 cfm | All Other Fan Systems ˃ 5,000 and ≤ 10,000 cfm | All Other Fan Systems ˃ 10,000 cfm | | --- | --- | --- | --- | --- | --- | --- | | Exhaust system base allowance | 0.221 | 0.246 | 0.236 | 0.186 | 0.184 | 0.190 | | Filter (any MERV value)b | 0.046 | 0.041 | 0.036 | 0.046 | 0.041 | 0.035 | | Energy recovery allowance for 0.50 ≤ ERR <0.55c | 0.139 | 0.120 | 0.107 | 0.139 | 0.123 | 0.109 | | Energy recovery allowance for 0.55 ≤ ERR <0.60c | 0.165 | 0.142 | 0.126 | 0.165 | 0.144 | 0.128 | | Energy recovery allowance for 0.60 ≤ ERR <0.65c | 0.190 | 0.163 | 0.146 | 0.191 | 0.166 | 0.148 | | Energy recovery allowance for 0.65 ≤ ERR <0.70c | 0.215 | 0.184 | 0.165 | 0.216 | 0.188 | 0.167 | | Energy recovery allowance for 0.70 ≤ ERR <0.75c | 0.240 | 0.206 | 0.184 | 0.241 | 0.209 | 0.186 | | Energy recovery allowance for 0.75 ≤ ERR <0.80c | 0.265 | 0.227 | 0.203 | 0.266 | 0.231 | 0.205 | | Energy recovery allowance for ERR ≥ 0.80c | 0.289 | 0.248 | 0.222 | 0.291 | 0.252 | 0.225 | | Coil runaround loop | 0.139 | 0.120 | 0.107 | 0.139 | 0.123 | 0.109 | | Return or exhaust systems required by code or accreditation standards to be fully ducted, or systems required to maintain air pressure differentials between adjacent rooms | 0.116 | 0.100 | 0.089 | 0.116 | 0.102 | 0.091 | | Return and/or exhaust airflow control devices | 0.116 | 0.100 | 0.089 | 0.116 | 0.102 | 0.091 | | Laboratory and vivarium exhaust systems in high-rise buildings for vertical duct exceeding 75 ft. Value shown is allowed W/cfm per 0.25 in. wg for each 100 feet exceeding 75 feetd | 0.058 | 0.051 | 0.045 | 0.058 | 0.052 | 0.046 | | Biosafety cabinet. Value shown is allowed W/cfm per 1.0 in. wg air pressure dropd | 0.231 | 0.198 | 0.177 | 0.232 | 0.202 | 0.179 | | Exhaust filters, scrubbers, or other exhaust treatment required by code or standard. Value shown is allowed W/cfm per 1.0 in. wg air pressure dropd | 0.231 | 0.198 | 0.177 | 0.232 | 0.202 | 0.179 | | Health care facility allowancee | 0.231 | 0.198 | 0.177 | 0.232 | 0.202 | 0.179 | | Sound attenuation section [Fans serving spaces with design background noise goals below NC35.] | 0.035 | 0.030 | 0.027 | 0.035 | 0.031 | 0.028 |

| a | See definition of FAN SYSTEM, MULTI-ZONE VARIABLE AIR VOLUME (VAV) to be classified as a Multi-Zone VAV System. | | --- | --- | | b | Filter pressure loss can only be counted once per fan system. | | c | Enthalpy Recovery Ratio (ERR) calculated per ANSI/ASHRAE 84-2020. | | d | Power allowance requires further calculation, multiplying the actual pressure drop (in. wg) of the device/component by the W/cfm in the Table C403.8.1(2). | | e | This allowance can only be taken for health care facilities. |

C403.8.1.2 Determining Fan System Electrical Input Power (Fan kWdesign,system).Fan kWdesign,system is the sum of Fan kWdesign for each fan or fan array included in the fan system. If variable speed drives are used, their efficiency losses shall be included. Fan input power shall be calculated with two-times the clean filter pressure drop. The Fan kWdesign for each fan or fan array shall be determined using one of the following methods. There is no requirement to use the same method for all fans in a fan system:

1. Use the default Fan kWdesign in Table C403.8.1.2 for one or more of the fans. This method cannot be used for complex fan systems.

2. Use the Fan kWdesign at fan system design conditions provided by the manufacturer of the fan, fan array, or equipment that includes the fan or fan array calculated per a test procedure included in 10 C.F.R. Part 430, 10 C.F.R. Part 431, ANSI/AMCA 208, ANSI/AMCA S210, AHRI 430, AHRI 440, or ISO 5801.

3. Use the Fan kWdesign provided by the manufacturer, calculated at fan system design conditions per one of the methods listed in Section 5.3 of ANSI/AMCA 208.

4. Determine the Fan kWdesign by using the maximum electrical input power provided on the motor nameplate.

Table C403.8.1.2

Default Values for Fan kWdesign Based on Motor Nameplate HPa,b

| Motor Nameplate HP | Default Fan kWdesign with variable speed drive (Fan kWdesign) | Default Fan kWdesign without variable speed drive (Fan kWdesign) | | --- | --- | --- | | <1 | 0.96 | 0.89 | | ≥1 and <1.5 | 1.38 | 1.29 | | ≥1.5 and <2 | 1.84 | 1.72 | | ≥2 and <3 | 2.73 | 2.57 | | ≥3 and <5 | 4.38 | 4.17 | | ≥5 and <7.5 | 6.43 | 6.15 | | ≥7.5 and <10 | 8.46 | 8.13 | | ≥10 and <15 | 12.4 | 12.0 | | ≥15 and <20 | 16.5 | 16.0 | | ≥20 and <25 | 20.5 | 19.9 | | ≥25 and <30 | 24.5 | 23.7 | | ≥30 and <40 | 32.7 | 31.7 | | ≥40 and <50 | 40.7 | 39.4 | | ≥50 and <60 | 48.5 | 47.1 | | ≥60 and <75 | 60.4 | 58.8 | | ≥75 and ≤100 | 80.4 | 78.1 |

| a | This table cannot be used for motor nameplate horsepower values greater than 100. | | --- | --- | | b | This table is to be used only with motors with a service factor ≤1.15. If the service factor is not provided, this table may not be used. |

C403.8.2 Motor nameplate horsepower. For each fan, the selected fan motor shall be no larger than the first available motor size greater than the brake horsepower (bhp). The fan brake horsepower (bhp) shall be indicated on the design documents to allow for compliance verification by the code official.

| EXCEPTIONS: | 1. For fans less than 6 bhp (4476 W), where the first available motor larger than the brake horsepower has a nameplate rating within 50 percent of the bhp, selection of the next larger nameplate motor size is allowed. | | --- | --- | | | 2. For fans 6 bhp (4476 W) and larger, where the first available motor larger than the bhp has a nameplate rating within 30 percent of the bhp, selection of the next larger nameplate motor size is allowed. | | | 3. For fans used only in approved life safety applications such as smoke evacuation. | | | 4. Fans with motor nameplate horsepower less than 1 hp or fans with a fan motor nameplate electrical input power of less than 0.89 kW. | | | 5. Fans equipped with electronic speed control devices to vary the fan airflow as a function of load. |

C403.8.3 Fan efficiency. Each fan and fan array shall have a fan energy index (FEI) of not less than 1.00 at the design point of operation, as determined in accordance with AMCA 208 by an approved, independent testing laboratory and labeled by the manufacturer. Each fan and fan array used for a variable-air volume system shall have an FEI of not less than 0.95 at the design point of operation as determined in accordance with AMCA 208 by an approved, independent testing laboratory and labeled by the manufacturer. The FEI for fan arrays shall be calculated in accordance with AMCA 208 Annex C.

| EXCEPTION: | The following fans are not required to have a fan energy index: | | --- | --- | | | 1. Fans that are not embedded fans with motor nameplate horsepower of less than 1.0 hp (0.75 kW) or with a nameplate electrical input power of less than 0.89 kW. | | | 2. Embedded fans that have a motor nameplate horsepower of 5 hp (3.7 kW) or less or with a fan system electrical input power of 4.1 kW or less. | | | 3. Multiple fans operated in series or parallel as the functional equivalent of a single fan that have a combined motor nameplate horsepower of 5 hp (3.7 kW) or less or with a fan system electrical input power of 4.1 kW or less. | | | 4. Fans that are part of equipment covered under Section C403.3.2. | | | 5. Fans included in an equipment package certified by an approved agency for air or energy performance. | | | 6. Ceiling fans. | | | 7. Fans used for moving gases at temperatures above 482°F (250°C). | | | 8. Fans used for operation in explosive atmospheres. | | | 9. Reversible fans used for tunnel ventilation. | | | 10. Fans that are intended to operate only during emergency conditions. | | | 11. Fans outside the scope of AMCA 208. |

C403.8.4Low-capacity ventilation fans. Mechanical ventilation system fans with motors less than 1/12 hp (0.062 kW) in capacity shall meet the efficacy requirements of Table C403.8.4 at one or more rating points.

| EXCEPTIONS: | 1. Where ventilation fans are a component of a listed heating or cooling appliance. | | --- | --- | | | 2. Dryer exhaust duct power ventilators and domestic range booster fans that operate intermittently. |

Table C403.8.4

Low-Capacity Ventilation Fan Efficacya

| Fan Location | Airflow Rate Minimum (cfm) | Minimum Efficacy (cfm/watt) | Airflow Rate Maximum (cfm) | | --- | --- | --- | --- | | HRV or ERV | Any | 1.2 cfm/watt | Any | | Range hood | Any | 2.8 cfm/watt | Any | | In-line fan | Any | 3.8 cfm/watt | Any | | Bathroom, utility room | 10 | 2.8 cfm/watt | < 90 | | Bathroom, utility room | 90 | 3.5 cfm/watt | Any |

| For SI: 1 cfm/ft = 47.82 W. | | | --- | --- | | a | Airflow shall be tested in accordance with HVI 916 and listed. Efficacy shall be listed or shall be derived from listed power and airflow. Fan efficacy for fully ducted HRV, ERV, balanced and in-line fans shall be determined at a static pressure not less than 0.2 inch w.c. Fan efficacy for ducted range hoods, bathroom, and utility room fans shall be determined at a static pressure not less than 0.1 inch w.c. |

C403.8.5 Fan controls. Controls shall be provided for fans in accordance with Section C403.8.5.1 and as required for specific systems provided in Section C403.

C403.8.5.1 Fan airflow control. Each cooling system listed in Table C403.8.5.1 shall be designed to vary the indoor fan airflow as a function of load and shall comply with the following requirements:

1. Direct expansion (DX) and chilled water cooling units that control the capacity of the mechanical cooling directly based on space temperature shall have not fewer than two stages of fan control. Low or minimum speed shall not be greater than 66 percent of full speed. At low or minimum speed, the fan system shall draw not more than 40 percent of the fan power at full fan speed. Low or minimum speed shall be used during periods of low cooling load and ventilation-only operation.

2. Other units including DX cooling units and chilled water units that control the space temperature by modulating the airflow to the space shall have modulating fan control. Minimum speed shall be not greater than 50 percent of full speed. At minimum speed, the fan system shall draw no more than 30 percent of the power at full fan speed. Low or minimum speed shall be used during periods of low cooling load and ventilation-only operation.

3. Units that include an airside economizer in accordance with Section C403.5 shall have not fewer than two speeds of fan control during economizer operation.

| EXCEPTIONS: | 1. Modulating fan control is not required for chilled water and evaporative cooling units with fan motors of less than 1 hp (0.746 kW) where the units are not used to provide ventilation air and the indoor fan cycles with the load. | | --- | --- | | | 2. Where the volume of outdoor air required to comply with the ventilation requirements of the International Mechanical Code at low speed exceeds the air that would be delivered at the minimum speed defined in Section C403.8.5, the minimum speed shall be selected to provide the required ventilation air. |

Table C403.8.5.1

Fan Control

| Cooling System Type | Fan Motor Size | Mechanical Cooling Capacity | | --- | --- | --- | | DX cooling | Any | ≥ 42,000 Btu/h | | Chilled water and evaporative cooling | ≥ 1/4 hp | Any |

C403.8.6 Large-diameter ceiling fans. Where provided, large-diameter ceiling fans shall be tested and labeled in accordance with AMCA 230.

Reviser's note: The brackets and enclosed material in the text of the above section occurred in the copy filed by the agency.

Wash. Admin. Code § 51-11C-4039 Section C403.9—Heat rejection and heat recovery equipment.

C403.9 Heat rejection and heat recovery equipment.

C403.9.1 Heat rejection equipment. Heat rejection equipment, including air-cooled condensers, dry coolers, open-circuit cooling towers, closed-circuit cooling towers and evaporative condensers, shall comply with this section.

| EXCEPTION: | Heat rejection devices where energy usage is included in the equipment efficiency ratings listed in Tables C403.3.2(1), C403.3.2(2), C403.3.2(3), C403.3.2(4), C403.3.2(8), C403.3.2(9), C403.3.2(10) and C403.3.2(16). | | --- | --- |

Heat rejection equipment shall have a minimum efficiency performance not less than values specified in Table C403.3.2(7).

C403.9.1.1 Fan speed control. Each fan powered by an individual motor or array of motors with a connected power, including the motor service factor, totaling 5 hp (3.7 kW) or more shall have controls and devices configured to automatically modulate the fan speed to control the leaving fluid temperature or condensing temperature and pressure of the heat rejection device. Fan motor power input shall be not more than 30 percent of design wattage at 50 percent of the design airflow.

| EXCEPTIONS: | 1. Fans serving multiple refrigerant or fluid cooling circuits. | | --- | --- | | | 2. Condenser fans serving flooded condensers. |

C403.9.1.2 Multiple-cell heat rejection equipment. Multiple-cell heat rejection equipment with variable speed fan drives shall be controlled to operate the maximum number of fans allowed that comply with the manufacturer's requirements for all system components and so that all fans can operate at the same fan speed required for the instantaneous cooling duty, as opposed to staged (on/off) operation. The minimum fan speed shall be the minimum allowable speed of the fan drive system in accordance with the manufacturer's recommendations.

C403.9.1.3 Limitation on centrifugal fan open-circuit cooling towers. Centrifugal fan open-circuit cooling towers with a combined rated capacity of 1,100 gpm (4164 L/m) or greater at 95°F (35°C) condenser water return, 85°F (29°C) condenser water supply, and 75°F (24°C) outdoor air wet-bulb temperature shall meet the energy efficiency requirement for axial fan open-circuit cooling towers listed in Table C403.3.2 (7).

C403.9.1.4 Tower flow turndown. Open-circuit cooling towers used on water-cooled chiller systems that are configured with multiple- or variable-speed condenser water pumps shall be designed so that all open circuit cooling tower cells can be run in parallel with the larger of the flow that is produced by the smallest pump at its minimum expected flow rate or at 50 percent of the design flow for the cell.

C403.9.2 Heat recovery.

C403.9.2.1 Condenser heat recovery for service water heating. Condenser heat recovery shall be installed for heating or reheating of service hot water provided the facility operates 24 hours a day, the total installed heat capacity of water cooled systems exceeds 1,500,000 Btu/hr of heat rejection, and the design service water heating load exceeds 250,000 Btu/hr.

The required heat recovery system shall have the capacity to provide the smaller of:

1. Sixty percent of the peak heat rejection load at design conditions; or

2. The preheating required to raise the peak service hot water draw to 85°F (29°C).

| EXCEPTIONS: | 1. Facilities that employ condenser heat recovery for space heating or reheat purposes with a heat recovery design exceeding 30 percent of the peak water-cooled condenser load at design conditions. | | --- | --- | | | 2. Facilities that provide 60 percent of their service water heating from site recovered energy. |

C403.9.2.2 Steam condensate systems. On-site steam heating systems shall have condensate water heat recovery. On-site includes a system that is located within or adjacent to one or more buildings within the boundary of a contiguous area or campus under one ownership and which serves one or more of those buildings.

Buildings using off-site generated steam where the condensate is not returned to the source, shall have an on-site condensate water heat recovery system.

C403.9.2.3 Refrigeration condenser heat recovery. Facilities having food service, meat or deli departments and having 500,000 Btu/h or greater of remote refrigeration condensers shall have condenser waste heat recovery from freezers and coolers and shall use the waste heat for service water heating, space heating or for dehumidification reheat. Facilities having a gross conditioned floor area of 40,000 ft2 or greater and 1,000,000 Btu/h or greater of remote refrigeration shall have condenser waste heat recovery from freezers and coolers and shall use the waste heat for service water heating, and either for space heating or for dehumidification reheat for maintaining low space humidity.

C403.9.2.4 Condenser heat recovery for space heating. A water-source condenser heat recovery system meeting the requirements of Sections C403.9.2.4.1 through C403.9.2.4.4 shall be installed to serve space and ventilation heating systems in new buildings and additions meeting the following criteria:

1. The facility operates greater than 70 hours per week.

2. The sum of all heat rejection equipment capacity serving the new building or addition exceeds 1,500,000 Btu/hr.

3. The sum of zone minimum airflows in all zones with zone reheat coils divided by the conditioned floor area served by those systems is at least 0.45 cfm per square foot.

| EXCEPTION: | Systems complying with Section C403.3.5, Dedicated outdoor air systems. | | --- | --- |

C403.9.2.4.1 Water-to-water heat recovery. Ninety percent (90%) of the total building space and ventilation heating system design load shall be served by systems that include heat recovery chiller or water-to-water heat pump equipment capable of rejecting heat from the cooling loop to the space and ventilation heating loop as the first stage of heating.

C403.9.2.4.2 Exhaust heat recovery. Heat shall be recovered by the heat recovery system from 90 percent of the total building exhaust airflow. The maximum leaving air temperature of exhaust air after heat recovery shall be 55ºF dry-bulb when operating at full capacity in heat recovery mode.

| EXCEPTIONS: | 1. Where energy recovery systems are restricted by Section 514 of the International Mechanical Code to sensible energy, those systems shall not be included in the calculation of total building exhaust airflow. | | --- | --- | | | 2. Exhaust air systems handling contaminated airstreams that are regulated by applicable codes or accreditation standards and pose a health risk to maintenance personnel to maintain heat recovery devices, those systems shall not be included in the calculation of total building exhaust airflow. |

C403.9.2.4.3 Process heat recovery. Spaces with year-round cooling loads from lights and equipment of 5 watts and greater per square foot shall be served by water-cooled equipment. Cooling loops serving the water-cooled equipment shall be served by water source heat recovery systems meeting the requirements of Section C403.9.2.4.1. If such spaces are provided with an air or water economizer, the economizer controls shall be configured with an override signal from the building automation system to disable economizer operation during heat recovery mode.

C403.9.2.4.4 Water-to-water heat recovery sizing. The minimum total combined capacity of heat recovery chillers or water-to-water heat pumps shall match the total combined capacity of installed equipment sized to meet the requirements of Sections C403.9.2.4.2 and C403.9.2.4.3.

History

• Statutory Authority: RCW 19.27A.020, 19.27A.025, 19.27A.160 and chapters 19.27A and 19.27 RCW. WSR 22-14-091, 23-12-101, and 23-20-021, § 51-11C-4039, filed 7/1/22, 6/7/23, and 9/25/23, effective 3/15/24. Statutory Authority: RCW 19.27A.025, 19.27A.045 and chapter 19.27 RCW. WSR 20-21-080, § 51-11C-4039, filed 10/19/20, effective 2/1/21. Statutory Authority: RCW 19.27A.020, 19.27A.025, 19.27A.160 and chapter 19.27 RCW. WSR 19-24-040, § 51-11C-4039, filed 11/26/19, effective 7/1/20.

Wash. Admin. Code § 51-11C-40391 Section C403.10—Construction of HVAC system elements.

C403.10 Construction of HVAC system elements. Ducts, plenums, piping and other elements that are part of an HVAC system shall be constructed and insulated in accordance with Sections C403.10.1 through C403.10.3.1.

C403.10.1 Duct and plenum insulation and sealing.

C403.10.1.1 Ducts, shafts, and plenums conveying outdoor air. Shafts and plenums conveying outdoor air from the exterior of the building to the mechanical system shall meet all air leakage and building envelope insulation requirements of Section C402, plus building envelope vapor control requirements from the International Building Code.

Ducts conveying outdoor air shall be insulated continuously from the building exterior to an automatic shutoff damper or heating or cooling equipment. Duct surfaces shall be insulated with the minimum insulation values in Table C403.10.1.1. Duct surfaces included as part of the building envelope shall not be used in the calculation of maximum glazing area as described in Section C402.4.1.

| EXCEPTION: | Outdoor air ducts serving individual supply air units with less than 2,800 cfm of total supply air capacity, provided these are insulated to the minimum insulation values in Table C403.10.1.1. | | --- | --- |

Table C403.10.1.1

Outdoor Air Ductwork Insulation

| Duct system | Duct Location and Use | Climate Zone | Airflow | Minimum Installed Duct Insulation R-valuea,b | Notes | | --- | --- | --- | --- | --- | --- | | Outdoor Air | Inside conditioned space and upstream of automatic shutoff damper | 4C and 5B | ≥ 2800 CFM | R-16 | See Section C403.10.1.1 for additional requirements | | Outdoor Air | Inside conditioned space and downstream of automatic shutoff damper to HVAC unit or room | 4C | ≥ 2800 CFM | R-8 | | | Outdoor Air | Inside conditioned space and downstream of automatic shutoff damper to HVAC unit or room | 5B | ≥ 2800 CFM | R-12 | | | Outdoor Air | Inside conditioned space | 4C and 5B | ≤ 2800 CFM | R-7 | See Exception 1 to Section C403.10.1.1 for additional details |

| a | Insulation R-values, measured in h·ft2·°F/Btu, are for the insulation as installed and do not include film resistance. The required minimum thicknesses do not consider water vapor transmission and possible surface condensation. Insulation resistance measured on a horizontal plane in accordance with ASTM C518 at a mean temperature of 75°F at the installed thickness. | | --- | --- | | b | See International Mechanical Code Sections 603.12 and 604 for further details on duct insulation requirements. |

C403.10.1.2 Other supply and return ducts. All other supply and return air ducts and plenums shall be insulated with a minimum of R-6 insulation where located in unconditioned spaces, and where located outside the building with a minimum of R-8 insulation in Climate Zone 4 and R-12 insulation in Climate Zone 5. Ducts located underground beneath buildings shall be insulated as required in this section or have an equivalent thermal distribution efficiency. Underground ducts utilizing the thermal distribution efficiency method shall be listed and labeled to indicate the R-value equivalency. Where located within a building envelope assembly, the duct or plenum shall be separated from the building exterior or unconditioned or exempt spaces by minimum insulation value as required for exterior walls by Section C402.1.3.

| EXCEPTIONS: | 1. Where located within equipment. | | --- | --- | | | 2. Supply and return ductwork located in unconditioned spaces where the design temperature difference between the interior and exterior of the duct or plenum does not exceed 15°F (8°C) and are insulated in accordance with Table C403.10.1.2. |

Where located within conditioned space, supply ducts which convey supply air at temperatures less than 55°F or greater than 105°F shall be insulated with a minimum insulation R-value in accordance with Table C403.10.1.2.

| EXCEPTION: | Ductwork exposed to view within a zone that serves that zone is not required to be insulated. | | --- | --- |

Where located within conditioned space, return or exhaust air ducts that convey return or exhaust air downstream of an energy recovery media shall be insulated with a minimum insulation R-value in accordance with Table C403.10.1.2.

All ducts, air handlers, and filter boxes shall be sealed. Joints and seams shall comply with Section 603.9 of the International Mechanical Code.

Table C403.10.1.2

Supply, Return, Exhaust and Relief Air Ductwork Insulation

| Duct System | Duct Location and Use | Climate Zone | Minimum Installed Duct Insulation R-valuea,b | Notes | | --- | --- | --- | --- | --- | | Supply air or return air | Outside the building (outdoors and exposed to weather)c | 4C | R-8 | See Section C403.10.1.2 for details | | Supply air or return air | Outside the building (outdoors and exposed to weather)c | 5B | R-12 | See Section C403.10.1.2 for details | | Supply air or return air | Unconditioned space (enclosed but not in the building conditioned envelope) | 4C and 5B | R-6 | See Section C403.10.1.2 for details | | Supply air or return air | Unconditioned space where the duct conveys air that is within 15°F of the air temperature of the surrounding unconditioned space | 4C and 5B | R-3.3 | See IMC Section 603.12 for additional requirements for condensation control at ductwork | | Supply air or return air | Where located in a building envelope assembly | 4C and 5B | R-16 | Duct or plenum is separated from building envelope assembly with the minimum insulation value | | Supply air | Within conditioned space where the supply duct conveys air that is less than 55°F or greater than 105°F | 4C and 5B | R-3.3 | See Section C403.10.1.2 for details | | Supply air | Within conditioned space that the duct directly serves where the supply duct conveys air that is less than 55°F or greater than 105°F | 4C and 5B | None | See Section C403.10.1.2 for details | | Supply air | Within conditioned space where the supply duct conveys air that is 55°F or greater and 105°F or less | 4C and 5B | None | | | Return or exhaust air | Within conditioned space, downstream of an energy recovery media, upstream of an automatic shutoff damper | 4C | R-8 | | | Return or exhaust air | Within conditioned space, downstream of an energy recovery media, upstream of an automatic shutoff damper | 5B | R-12 | | | Relief or exhaust air | Conditioned space and downstream of an automatic shutoff damper | 4C and 5B | R-16 | |

| a | Insulation R-values, measured in h·ft2·°F/Btu, are for the insulation as installed and do not include film resistance. The required minimum thicknesses do not consider water vapor transmission and possible surface condensation. Insulation resistance measured on a horizontal plane in accordance with ASTM C518 at a mean temperature of 75°F at the installed thickness. | | --- | --- | | b | See International Mechanical Code Sections 603.12 and 604 for further details on duct insulation requirements. | | c | Includes attics above insulated ceilings, parking garages and crawl spaces. |

C403.10.2 Duct construction. Ductwork shall be constructed and erected in accordance with the International Mechanical Code. For the purposes of this section, longitudinal seams are joints oriented in the direction of airflow. Transverse joints are connections of two duct sections oriented perpendicular to airflow. Duct wall penetrations are openings made by any screw, fastener, pipe, rod, or wire. All other connections are considered transverse joints including, but not limited to, spin-ins, taps, and other branch connections, access door frames and jambs, and duct connections to equipment.

C403.10.2.1 Low-pressure duct systems. Longitudinal and transverse joints, seams and connections of supply and return ducts operating at a static pressure less than or equal to 2 inches water gauge (w.g.) (500 Pa) shall be securely fastened and sealed with welds, gaskets, mastics (adhesives), mastic-plus embedded-fabric systems or tapes installed in accordance with the manufacturer's installation instructions. Pressure classifications specific to the duct system shall be clearly indicated on the construction documents in accordance with the International Mechanical Code.

| EXCEPTION: | Continuously welded and locking-type longitudinal joints and seams on ducts operating at static pressures less than 2 inches water gauge (w.g.) (500 Pa) pressure classification. | | --- | --- |

C403.10.2.2 Medium-pressure duct systems. Ducts and plenums designed to operate at a static pressure greater than 2 inches water gauge (w.g.) (500 Pa) but less than 3 inches w.g. (750 Pa) shall be insulated and sealed in accordance with Section C403.10.1. Pressure classifications specific to the duct system shall be clearly indicated on the construction documents in accordance with the International Mechanical Code.

C403.10.2.3 High-pressure duct systems. Ducts designed to operate at static pressures equal to or greater than 3 inches water gauge (w.g.) (750 Pa) shall be insulated and sealed in accordance with Section C403.10.1. In addition, ducts and plenums shall be leak-tested in accordance with the SMACNA HVAC Air Duct Leakage Test Manual and shown to have a rate of air leakage (CL) less than or equal to 4.0 as determined in accordance with Equation 4-12.

(Equation 4-12)

| CL | | F/P0.65 | | --- | --- | --- | | Where: | | | | F | | The measured leakage rate in cfm per 100 square feet of duct surface. | | P | | The static pressure of the test. |

Documentation shall be furnished demonstrating that representative sections totaling at least 25 percent of the duct area have been tested and that all tested sections meet the requirements of this section.

C403.10.3 Piping insulation. All piping, other than field installed HVAC system refrigerant piping, serving as part of a heating or cooling system shall be thermally insulated in accordance with Table C403.10.3.

| EXCEPTIONS: | 1. Factory-installed piping within HVAC equipment tested and rated in accordance with a test procedure referenced by this code. | | --- | --- | | | 2. Factory-installed piping within room fan-coils and unit ventilators tested and rated according to AHRI 440 (except that the sampling and variation provisions of Section 6.5 shall not apply) and 840, respectively. | | | 3. Piping that conveys fluids that have a design operating temperature range between 60°F (15°C) and 105°F (41°C). | | | 4. Piping that conveys fluids that have not been heated or cooled through the use of fossil fuels or electric power. | | | 5. Strainers, control valves, and balancing valves associated with piping 1 inch (25 mm) or less in diameter. | | | 6. Direct buried piping that conveys fluids at or below 60°F (15°C). | | | 7. In radiant heating systems, sections of piping intended by design to radiate heat. |

Table C403.10.3

Minimum Pipe Insulation Thickness (thickness in inches)a

| Fluid Operating Temperature Range and Usage (°F) | Insulation Conductivity | Nominal Pipe or Tube Size (inches) | | | | | | | --- | --- | --- | --- | --- | --- | --- | --- | | Conductivity Btu • in. /(h • ft2 • °F)b | Mean Rating Temperature, °F | < 1 | 1 to < 1-1/2 | 1-1/2 to < 4 | 4 to < 8 | ≥ 8 | | | ˃ 350 | 0.32 - 0.34 | 250 | 4.5 | 5.0 | 5.0 | 5.0 | 5.0 | | 251 - 350 | 0.29 - 0.32 | 200 | 3.0 | 4.0 | 4.5 | 4.5 | 4.5 | | 201 - 250 | 0.27 - 0.30 | 150 | 2.5 | 2.5 | 2.5 | 3.0 | 3.0 | | 141 - 200 | 0.25 - 0.29 | 125 | 1.5 | 1.5 | 2.0 | 2.0 | 2.0 | | 105 - 140 | 0.21 - 0.28 | 100 | 1.0 | 1.0 | 1.5 | 1.5 | 1.5 | | 40 - 60 | 0.21 - 0.27 | 75 | 0.5 | 0.5 | 1.0 | 1.0 | 1.0 | | < 40 | 0.20 - 0.26 | 75 | 0.5 | 1.0 | 1.0 | 1.0 | 1.5 |

| a | For piping smaller than 1-1/2 inch (38 mm) and located in partitions within conditioned spaces, reduction of these thicknesses by 1 inch (25 mm) shall be permitted (before thickness adjustment required in footnote b) but not to a thickness less than 1 inch (25 mm). | | --- | --- | | b | For insulation outside the stated conductivity range, the minimum thickness (T) shall be determined as follows: |

| T | | r{(1 + t/r)K/k - 1} | | --- | --- | --- | | Where: | | | | T | = | Minimum insulation thickness. | | r | = | Actual outside radius of pipe. | | t | = | Insulation thickness listed in the table for applicable fluid temperature and pipe size. | | K | = | Conductivity of alternate material at mean rating temperature indicated for the applicable fluid temperature (Btu × in/h × ft2 × °F). | | k | = | The upper value of the conductivity range listed in the table for the applicable fluid temperature. |

| c | For direct-buried heating and hot water system piping, reduction of these thicknesses by 1-1/2 inches (38 mm) shall be permitted (before thickness adjustment required in footnote b but not to thicknesses less than 1 inch (25 mm). | | --- | --- |

C403.10.3.1 Protection of piping insulation. Piping insulation exposed to weather shall be protected from damage, including that due to sunlight, moisture, physical damage and wind, and shall provide shielding from solar radiation that can cause degradation of the material. Protection shall be removable for no less than six feet from the equipment for maintenance. Adhesive tape shall not be permitted.

C403.10.4 Insulation of HVAC system refrigerant piping. Field installed HVAC refrigerant piping, other than piping factory installed in HVAC equipment, shall have insulation as listed below, at a conductivity rating of 0.21 to 0.26 Btu × in/(h × ft2 × °F) with a mean temperature rating of 75°F. Piping insulation exposed to weather shall be protected from damage, including that due to sunlight, moisture, physical damage and wind, and shall provide shielding from solar radiation that can cause degradation of the material. Adhesive tape shall not be permitted. Manufacturer's required minimum pipe insulation shall be maintained.

1. For lines that convey hot gas for space heating:

1.1. Minimum 1-inch insulation on the portions outside the building thermal envelope.

1.2. Minimum 1/2-inch insulation on the portions within the building thermal envelope.

2. Minimum 1/2-inch insulation on the liquid line for mini-split systems and other systems for which insulation is required by the manufacturer, or where the metering device is located in the outdoor unit.

3. No insulation is required on the liquid line for other heat pump types or for cooling-only units where insulation is not required by the manufacturer.

History

• Statutory Authority: RCW 19.27A.020, 19.27A.025, 19.27A.160 and chapters 19.27A and 19.27 RCW. WSR 22-14-091, 23-12-101, and 23-20-021, § 51-11C-40391, filed 7/1/22, 6/7/23, and 9/25/23, effective 3/15/24. Statutory Authority: RCW 19.27A.025, 19.27A.045 and chapter 19.27 RCW. WSR 20-21-080, § 51-11C-40391, filed 10/19/20, effective 2/1/21. Statutory Authority: RCW 19.27A.020, 19.27A.025, 19.27A.160 and chapter 19.27 RCW. WSR 19-24-040, § 51-11C-40391, filed 11/26/19, effective 7/1/20.

Wash. Admin. Code § 51-11C-40392 Section C403.11—Mechanical systems outside the building envelope.

C403.11 Mechanical systems located outside of the building thermal envelope. Mechanical systems providing heat outside of the thermal envelope of a building shall comply with Sections C403.11.1 through C403.11.3.

C403.11.1 Heating outside a building. Systems installed to provide heat outside a building shall be radiant systems.

Such heating systems shall be controlled by an occupancy sensing device or a timer switch, so that the system is automatically deenergized when no occupants are present.

C403.11.2 Snow- and ice-melt system controls. Snow- and ice-melting systems, supplied through energy service to the building, shall include automatic controls configured to shut off the system when the pavement temperature is above 50°F (10°C) and no precipitation is falling and an automatic control that is configured to shut off when the outdoor temperature is above 40°F (4°C) so that the potential for snow or ice accumulation is negligible.

C403.11.3 Freeze protection system controls. Freeze protection systems, such as heat tracing of outdoor piping and heat exchangers, including self-regulating heat tracing, shall include automatic controls configured to shut off the systems when outdoor air temperatures are above 40°F (4°C) or when the conditions of the protected fluid will prevent freezing.

History

• Statutory Authority: RCW 19.27A.025, 19.27A.045 and chapter 19.27 RCW. WSR 20-21-080, § 51-11C-40392, filed 10/19/20, effective 2/1/21. Statutory Authority: RCW 19.27A.020, 19.27A.025, 19.27A.160 and chapter 19.27 RCW. WSR 19-24-040, § 51-11C-40392, filed 11/26/19, effective 7/1/20.

Wash. Admin. Code § 51-11C-40393 Section C403.12—High efficiency single zone VAV systems.

C403.12 High efficiency single-zone variable air volume (VAV) systems. For HVAC systems subject to the requirements of Section C403.3.5 but utilizing Exception 2 of that section, a high efficiency single-zone VAV system may be provided without a separate parallel DOAS when the system is designed, installed, and configured to comply with all of the following criteria (this exception shall not be used as a substitution for a DOAS per Section C406.6 or as a modification to the requirements for the Standard Reference Design in accordance with Section C407):

1. The single-zone VAV system is provided with airside economizer in accordance with Section C403.3 without exceptions.

2. A direct-digital control (DDC) system is provided to control the system as a single zone in accordance with Section C403.4.11 regardless of sizing thresholds of Table C403.4.11.1.

3. Single-zone VAV systems with a minimum outdoor air requirement of 1,000 cfm (472 L/s) or greater shall be equipped with a device capable of measuring outdoor airflow intake under all load conditions. The system shall be capable of increasing or reducing the outdoor airflow intake based on Section C403.7.1, Demand controlled ventilation.

4. Allowable fan power shall not exceed 90 percent of the allowable fan power budget as defined by Section C403.8.1.1.

5. Each single-zone VAV system shall be designed to vary the supply fan airflow as a function of heating and cooling load and minimum fan speed shall not be more than the greater of:

5.1. 30 percent of peak design airflow; or

5.2. The required ventilation flow assuming no occupants.

6. Spaces that are larger than 150 square feet (14 m2) and with an occupant load greater than or equal to 25 people per 1000 square feet (93 m2) of floor area (as established in Table 403.3.1.1 of the International Mechanical Code) shall be provided with all of the following features:

6.1. Demand control ventilation (DCV) shall be provided that utilizes a carbon dioxide sensor to reset the ventilation setpoint of the single-zone VAV system from the design minimum to design maximum ventilation rate as required by Chapter 4 of the International Mechanical Code.

6.2. Occupancy sensors shall be provided that are configured to reduce the minimum ventilation rate to zero and setback room temperature setpoints by a minimum of 5°F, for both cooling and heating, when the space is unoccupied.

7. Single-zone VAV systems shall comply with one of the following options:

7.1. Single-zone VAV air handling units with a hydronic heating coil connected to systems with hot water generation equipment limited to the following types of equipment: Gas-fired hydronic boilers with a thermal efficiency, Et, of not less than 92 percent, air-to-water heat pumps or heat recovery chillers. Hydronic heating coils shall be sized for a maximum entering hot water temperature of 120°F for peak anticipated heating load conditions.

7.2. Single-zone VAV air handing units with a chilled water coil connected to systems with chilled water generation equipment with IPLV values more than 25 percent higher than the minimum part load efficiencies listed in Table C403.3.2(3), in the appropriate size category, using the same test procedures. Equipment shall be listed in the appropriate certification program to qualify. The smallest chiller or compressor in the central plant shall not exceed 20 percent of the total central plant cooling capacity or the chilled water system shall include thermal storage sized for a minimum of 20 percent of the total central cooling plant capacity.

7.3. Single-zone VAV air handling units with DX cooling, heat pump heating or gas-fired furnace shall comply with the following requirements as applicable:

7.3.1. Have a DX cooling coil with cooling part load efficiency that is a minimum of 15 percent higher than the minimum SEER or IEER listed in Tables C403.3.2(1), C403.3.2(2), and C403.3.2(14).

7.3.2. Have a gas-fired furnace with a thermal efficiency, Et, of not less than 90 percent or heat pump with a minimum heating HSPF or COP efficiency that are a minimum of 10 percent higher than the minimum heating efficiency in Tables C403.3.2(1), C403.3.2(2), and C403.3.2(14).

7.3.3. Heating coils or burner output shall be modulating or have a minimum of 2 stages with the first stage being less than 50 percent of total heating capacity. Cooling coils shall be modulating or have a minimum of 2 stages with the first stage being less than 50 percent of the total cooling capacity.

8. The DDC system shall include a fault detection and diagnostics (FDD) system complying with the following:

8.1. The following temperature sensors shall be permanently installed to monitor system operation:

8.1.1. Outside air.

8.1.2. Supply air.

8.1.3. Return air.

8.2. Temperature sensors shall have an accuracy of ±2°F (1.1°C) over the range of 40°F to 80°F (4°C to 26.7°C).

8.3. The single-zone VAV air handling unit controller shall be configured to provide system status by indicating the following:

8.3.1. Free cooling available.

8.3.2. Economizer enabled.

8.3.3. Compressor enabled.

8.3.4. Heating enabled.

8.3.5. Mixed air low limit cycle active.

8.3.6. The current value of each sensor.

8.4. The single-zone VAV air handling unit controller shall be capable of manually initiating each operating mode so that the operation of compressors, economizers, fans and the heating system can be independently tested and verified.

8.5. The single-zone VAV air handling unit shall be configured to report faults to a fault management application able to be accessed by day-to-day operating or service personnel or annunciated locally on zone thermostats.

8.6. The FDD system shall be configured to detect the following faults:

8.6.1. Air temperature sensor failure/fault.

8.6.2. Not economizing when the unit should be economizing.

8.6.3. Economizing when the unit should not be economizing.

8.6.4. Outdoor air or return air damper not modulating.

8.6.5. Excess outdoor air.

History

• Statutory Authority: RCW 19.27A.020, 19.27A.025, 19.27A.160 and chapters 19.27A and 19.27 RCW. WSR 22-14-091, 23-12-101, and 23-20-021, § 51-11C-40393, filed 7/1/22, 6/7/23, and 9/25/23, effective 3/15/24. Statutory Authority: RCW 19.27A.025, 19.27A.045 and chapter 19.27 RCW. WSR 20-21-080, § 51-11C-40393, filed 10/19/20, effective 2/1/21. Statutory Authority: RCW 19.27A.020, 19.27A.025, 19.27A.160 and chapter 19.27 RCW. WSR 19-24-040, § 51-11C-40393, filed 11/26/19, effective 7/1/20.

Wash. Admin. Code § 51-11C-40394 Section C403.13—Dehumidification for plant growth.

C403.13 Dehumidification in spaces for plant growth and maintenance. Equipment that dehumidifies building spaces used for plant growth and maintenance shall be one of the following:

1. Stand-alone dehumidifiers that meet the following minimum integrated energy factors as measured by the test conditions in Appendix X1 to Subpart B of 10 C.F.R. Part 430:

1.1. Minimum integrated energy factor of 1.77 L/kWh for product case volumes of 8.0 cubic feet or less;

1.2. Minimum integrated energy factor of 2.41 L/kWh for product case volumes greater than 8.0 cubic feet;

2. Integrated HVAC system including, but not limited to, heat pump technology, with on-site heat recovery designed to fulfill at least 75 percent of the annual energy for dehumidification reheat;

3. Chilled water system including, but not limited to, heat pump technology, with on-site heat recovery designed to fulfill at least 75 percent of the annual energy for dehumidification reheat; or

4. Solid or liquid desiccant dehumidification system for system designs that require dewpoint of 50°F (10°C) or less.

C403.14 Commissioning. Mechanical systems shall be commissioned in accordance with Section C408.

History

• Statutory Authority: RCW 19.27A.020, 19.27A.025, 19.27A.160 and chapters 19.27A and 19.27 RCW. WSR 22-14-091, 23-12-101, and 23-20-021, § 51-11C-40394, filed 7/1/22, 6/7/23, and 9/25/23, effective 3/15/24.

Wash. Admin. Code § 51-11C-40400 Section C404—Service water heating and pressure-booster systems.

History

• Statutory Authority: RCW 19.27A.020, 19.27A.025, 19.27A.160 and chapter 19.27 RCW. WSR 19-24-040, § 51-11C-40400, filed 11/26/19, effective 7/1/20. Statutory Authority: RCW 19.27A.020, 19.27A.025 and chapters 19.27 and 34.05 RCW. WSR 13-04-056, § 51-11C-40400, filed 2/1/13, effective 7/1/13.

Wash. Admin. Code § 51-11C-40401 Section C404.1—General.

C404.1 General. This section covers the minimum efficiency of, and controls for, service water-heating equipment and insulation of service hot water piping.

| EXCEPTION: | Energy using equipment used by a manufacturing, industrial or commercial process other than maintaining comfort and amenities for the occupants are exempt from all Section C404 subsections except Sections C404.2 and C404.13. | | --- | --- |

History

• Statutory Authority: RCW 19.27A.020, 19.27A.025, 19.27A.160 and chapters 19.27A and 19.27 RCW. WSR 22-14-091, 23-12-101, and 23-20-021, § 51-11C-40401, filed 7/1/22, 6/7/23, and 9/25/23, effective 3/15/24. Statutory Authority: RCW 19.27A.020, 19.27A.025 and chapters 19.27 and 34.05 RCW. WSR 13-04-056, § 51-11C-40401, filed 2/1/13, effective 7/1/13.

Wash. Admin. Code § 51-11C-40402 Section C404.2—Service water-heating equipment performance efficiency.

C404.2 Service water-heating equipment performance efficiency. Water-heating equipment and hot water storage tanks shall meet the requirements of Table C404.2. The efficiency shall be verified through certification and listed under an approved certification program, or if no certification program exists, the equipment efficiency ratings shall be supported by data furnished by the manufacturer. Water-heating equipment intended to be used to provide space heating shall meet the applicable provisions of Table C404.2.

C404.2.1 Service water heating system type. Service hot water shall be provided by an electric air-source heat pump water heating (HPWH) system meeting the requirements of this section. Supplemental service water heating equipment is permitted to use electric resistance or fossil fuel in compliance with Section C404.2.1.4.

| EXCEPTIONS: | 1. 24 kW plus 0.1 watts per square foot of building area of electric resistance service water heating capacity is allowed per building. | | --- | --- | | | 2. Solar thermal, wastewater heat recovery, other approved waste heat recovery, ground source heat pumps, water-source heat pump systems utilizing waste heat, and combinations thereof, are permitted to offset all or any portion of the required HPWH capacity where such systems comply with this code and the Uniform Plumbing Code. | | | 3. Systems that comply with the Northwest Energy Efficiency Alliance (NEEA) Commercial Electric Advanced Water Heating Specification. | | | 4. Service hot water systems served by a district energy system that serves multiple buildings and that was in service before the effective date of this code. | | | 5. Commercial dishwashers, commercial food service equipment, and other approved process equipment are permitted to utilize electric booster heaters for supply water temperatures 120°F (49°C) or higher. | | | 6. Systems connected to a low-carbon district energy exchange system or a low-carbon district heating and cooling or heating only system. | | | 7. Essential facilities. Groups I-2 and I-3 occupancies that by regulation are required to have in place redundant emergency backup systems. |

C404.2.1.1 Primary heat pump system sizing. The primary heat pump service water heating system shall be sized to deliver no less than 50 percent of the calculated demand for service hot water production during the peak demand period. Demand shall be calculated using the equipment manufacturer's selection criteria or another approved methodology with entering dry bulb or wet bulb outdoor air temperature at 40°F (4°C) for air-source heat pumps, or 44°F (7°C) ground temperature for ground-source heat pumps. Electric air source heat pumps shall also be sized to deliver no less than 25 percent of the calculated demand for service hot water production during the peak demand period when entering dry bulb or wet bulb outdoor air temperature is 24°F (-4°C). The remaining primary service output may be met by fossil fuel, electric resistance, or heat pump water heating systems.

| EXCEPTION: | Twenty-five percent sizing at entering dry bulb or wet bulb air temperature of 24°F (-4°C) is not required for air-source heat pumps located in a below-grade enclosed parking structure or other ventilated and unconditioned space that is not anticipated to fall below 40°F (4°C) at any time. | | --- | --- |

C404.2.1.2 Primary hot water storage sizing. The system shall provide sufficient hot water to satisfy peak demand period requirements.

C404.2.1.3 System design. The service water heating system shall be configured to conform to one of the following provisions:

1. For single-pass heat pump water heaters, temperature maintenance heating provided for reheating return water from the building's heated water circulation system shall be physically decoupled from the primary service water heating system storage tank(s) in a manner that prevents destratification of the primary system storage tanks. Temperature maintenance heating is permitted to be provided by electric resistance, fossil fuel, or a separate dedicated heat pump system.

2. For multi-pass heat pump water heaters, recirculated temperature maintenance water is permitted to be returned to the primary water storage tanks for reheating.

3. For unitary heat pump water heaters, located in conditioned space, are permitted, where they are sized to meet all calculated service water heating demand using the heat pump compressor, and not supplementary heat.

C404.2.1.3.1 Mixing valve. A thermostatic mixing valve capable of supplying hot water to the building at the user temperature setpoint shall be provided, in compliance with requirements of the Uniform Plumbing Code and the HPWH manufacturer's installation guidelines. The mixing valve shall be sized and rated to deliver tempered water in a range from the minimum flow of the temperature maintenance recirculation system up to the maximum demand for the fixtures served.

C404.2.1.4 Supplemental water heating. Total supplemental water heating equipment shall not have an output capacity greater than the total summed capacity of all primary water heating equipment. For the purposes of determining this supplemental water heating allowance, the capacity of primary water heating equipment shall be evaluated at 40°F (4°C) entering dry bulb or wet bulb outdoor air temperature for air-source heat pumps, 44°F (7°C) ground temperature for ground-source heat pumps, and at the nameplate input rate for all other water heater system types. Supplemental heating is permitted for the following uses:

1. Temperature maintenance of heated-water circulation systems, physically separate from the primary service water heating system.

2. Defrost of compressor coils.

3. Heat tracing of piping for freeze protection or for temperature maintenance in lieu of recirculation of hot water.

4. Backup or low ambient temperature conditions, where all of the following are true:

4.1. During normal operations, the supplemental heating is controlled to operate only when the entering air temperature at the air-source HPWH is below 40°F (4°C), and the primary HPWH compressor continues to operate together with the supplemental heating.

4.2. The primary water heating equipment cannot satisfy the system load due to equipment failure or entering air temperature below 40°F (4°C).

C404.2.1.5 System fault detection. The control system shall be capable of and configured to send automatic error alarms to building or maintenance personnel upon detection of equipment faults, low leaving water temperature from primary storage tanks, or low hot water supply delivery temperature to building distribution system.

History

• Statutory Authority: RCW 19.27A.020, 19.27A.025, 19.27A.160, chapters 19.27A and 19.27 RCW. WSR 24-03-085, § 51-11C-40402, filed 1/16/24, effective 3/15/24
• WSR 22-14-091, 23-12-101, and 23-20-021, § 51-11C-40402, filed 7/1/22, 6/7/23, and 9/25/23, effective 3/15/24. Statutory Authority: RCW 19.27A.025, 19.27A.045 and chapter 19.27 RCW. WSR 20-21-080, § 51-11C-40402, filed 10/19/20, effective 2/1/21. Statutory Authority: RCW 19.27A.020, 19.27A.025, 19.27A.160 and chapter 19.27 RCW. WSR 19-24-040, § 51-11C-40402, filed 11/26/19, effective 7/1/20. Statutory Authority: RCW 19.27A.025, 19.27A.160, and 19.27.074. WSR 16-03-072, § 51-11C-40402, filed 1/19/16, effective 7/1/16. Statutory Authority: RCW 19.27A.020, 19.27A.025 and chapters 19.27 and 34.05 RCW. WSR 13-04-056, § 51-11C-40402, filed 2/1/13, effective 7/1/13.

Wash. Admin. Code § 51-11C-404021 Table C404.2—Minimum performance of water-heating equipment.

Table C404.2

Minimum Performance of Water-Heating Equipment

| Equipment Type | Size Category (input) | Subcategory or Rating Condition | Draw Pattern | Performance Requireda,j | Test Procedureb | | --- | --- | --- | --- | --- | --- | | Electric table-top water heatersk | ≤ 12 kWc | ≥ 20 gal ≤ 120 gal | Very small Low Medium High | UEF ≥ 0.6323 - (0.0058 × Vr) UEF ≥ 0.9188 - (0.0031 × Vr) UEF ≥ 0.9577 - (0.0023 × Vr) UEF ≥ 0.9884 - (0.0016 × Vr) | DOE 10 C.F.R. Part 430 App. E | | Electric storage water heatersg,i resistance and heat pump | ≤ 12 kWc | ≥ 20 gal ≤ 55 gal | Very small Low Medium High | UEF ≥ 0.8808 - (0.0008 × Vr) UEF ≥ 0.9254 - (0.0003 × Vr) UEF ≥ 0.9307 - (0.0002 × Vr) UEF ≥ 0.9349 - (0.0001 × Vr) | DOE 10 C.F.R. Part 430 App. E | | ≤ 12 kW | ˃ 55 gal ≤ 120 gal | Very small Low Medium High | UEF ≥ 1.9236 - (0.0011 × Vr) UEF ≥ 2.0440 - (0.0011 × Vr) UEF ≥ 2.1171 - (0.0011 × Vr) UEF ≥ 2.2418 - (0.0011 × Vr) | DOE 10 C.F.R. Part 430 App. E | | | Electric storage water heatersg | ˃ 12 kW | | | (0.3 + 27/Vm), %h | DOE 10 C.F.R. 431.106 App B. | | Grid-enabled water heatersg,l | | ˃ 75 gal | Very small Low Medium High | UEF ≥ 1.0136 - (0.0028 × Vr) UEF ≥ 0.9984 - (0.0014 × Vr) UEF ≥ 0.9853 - (0.0010 × Vr) UEF ≥ 0.9720 - (0.0007 × Vr) | 10 C.F.R. 430 Appendix E | | Electric instantaneous water heaterh | ≤ 12 kW | < 2 gal | Very small Low Medium High | UEF ≥ 0.91 UEF ≥ 0.91 UEF ≥ 0.91 UEF ≥ 0.92 | DOE 10 C.F.R. Part 430 | | ˃ 12 kW & ≤ 58.6 kWc | ≤ 2 gal ≤ 180°F | All | UEF ≥ 0.80 | DOE 10 C.F.R. Part 430 | | | Gas storage water heatersg | ≤ 75,000 Btu/h | ≥ 20 gal & ≤ 55 galf | Very small Low Medium High | UEF ≥ 0.3456 - (0.0020 × Vr) UEF ≥ 0.5982 - (0.0019 × Vr) UEF ≥ 0.6483 - (0.0017 × Vr) UEF ≥ 0.6920 - (0.0013 × Vr) | DOE 10 C.F.R. Part 430 App. E | | ≤ 75,000 Btu/h | ˃ 55 gal & ≤ 100 galf | Very small Low Medium High | UEF ≥ 0.6470 - (0.0006 × Vr) UEF ≥ 0.7689 - (0.0005 × Vr) UEF ≥ 0.7897 - (0.0004 × Vr) UEF ≥ 0.8072 - (0.0003 × Vr) | DOE 10 C.F.R. Part 430 App. E | | | ˃ 75,000 Btu/h and ≤ 105,000 Btu/hd | ≤ 120 gal ≤ 180°F | Very small Low Medium High | UEF ≥ 0.2674-0.0009 x Vr UEF ≥ 0.5362-0.0012 x Vr UEF ≥ 0.6002-0.0011 x Vr UEF ≥ 0.6597-0.0009 x Vr | DOE 10 C.F.R. Part 430 App. E | | | ˃ 105,000 Btu/hd,f | | | 80% Et SL ≤ (Q/800 +110√V), Btu/h | DOE 10 C.F.R. 431.106 | | | Gas instantaneous water heaterh | ˃ 50,000 Btu/h and < 200,000 Btu/h | < 2 gal | Very small Low Medium High | UEF ≥ 0.80 UEF ≥ 0.81 UEF ≥ 0.81 UEF ≥ 0.81 | DOE 10 C.F.R. Part 430 App. E | | ≥ 200,000 Btu/hd,f | < 10 gal | | 80% Et | DOE 10 C.F.R. 431.106 | | | ≥ 200,000 Btu/hf | ≥ 10 gal | | 80% Et SL ≤ (Q/800 +110√V), Btu/h | | | | Oil storage water heatersg | ≤ 105,000 Btu/h | ≤ 50 gal | Very small Low Medium High | UEF = 0.2509 – (0.0012 × Vr) UEF = 0.5330 – (0.0016 × Vr) UEF = 0.6078 – (0.0016 × Vr) UEF = 0.6815 – (0.0014 × Vr) | DOE 10 C.F.R. Part 430 | | ˃ 105,000 Btu/h and ≤ 140,000 Btu/he | ≤ 120 gal ≤ 180°F | Very small Low Medium High | UEF ≥ 0.2932-0.0015 x Vr UEF ≥ 0.5596-0.0018 x Vr UEF ≥ 0.6194-0.0016 x Vr UEF ≥ 0.6740-0.0013 x Vr | DOE 10 C.F.R. Part 430 App. E | | | ˃ 140,000 Btu/h | | | 80% Et SL ≤ (Q/800 +110√V), Btu/h | DOE 10 C.F.R. 431.106 | | | Oil instantaneous water heaterh | ≤ 210,000 Btu/h | < 2 gal | | 80% Et EF ≥ 0.59 - 0.0005 x V | DOE 10 C.F.R. Part 430 App. E | | ˃ 210,000 Btu/h | < 10 gal | | 80% Et | DOE 10 C.F.R. 431.106 | | | ˃ 210,000 Btu/h | ≥ 10 gal | | 78% Et SL ≤ (Q/800 +110√V), Btu/h | DOE 10 C.F.R. 431.106 | | | Hot water supply boilers, gas and oilh | ≥ 300,000 Btu/h and < 12,500,000 Btu/h | < 10 gal | | 80% Et | DOE 10 C.F.R. 431.106 | | Hot water supply boilers, gash | ≥ 300,000 Btu/h and < 12,500,000 Btu/h | ≥ 10 gal | | 80% Et SL ≤ (Q/800 +110√V), Btu/h | DOE 10 C.F.R. 431.106 | | Hot water supply boilers, oilh | ≥ 300,000 Btu/h and < 12,500,000 Btu/h | ≥ 10 gal | | 78% Et SL ≤ (Q/800 +110√V), Btu/h | DOE 10 C.F.R. 431.106 | | Pool heaters, gas | All | | | 82% Et | DOE 10 C.F.R. Part 430 App. P | | Heat pump pool heaters | All | 50°F db 44.2°F wb outdoor air 80.0°F entering water | | 4.0 COP | DOE 10 C.F.R. Part 430 App. P | | Unfired storage tanks | All | | | Minimum insulation requirement R-12.5 (h-ft2-°F)/Btu | (none) |

| a | Thermal efficiency (Et) is a minimum requirement, while standby loss is a maximum requirement. In the standby loss equation, V is the rated volume in gallons and Q is the nameplate input rate in Btu/h. Vm is the measured volume in the tank in gallons. Standby loss for electric water heaters is in terms of %/h and denoted by the term "S," and standby loss for gas and oil water heaters is in terms of Btu/h and denoted by the term "SL" Draw pattern (DP) refers to the water draw profile in the Uniform Energy Factor (UEF) test. UEF and Energy Factor (EF) are minimum requirements. In the UEF standard equations, Vr refers to the rated volume in gallons. | | | --- | --- | --- | | b | Chapter 6 contains a complete specification, including the year version, of the referenced test procedure. | | | c | Electric instantaneous water heaters with input capacity ˃ 12 kW and ≤ 58.6 kW that have either (1) a storage volume ˃ 2 gal; or (2) is designed to provide outlet hot water at temperatures greater than 180°F; or (3) uses three-phase power has no efficiency standard. | | | d | Gas storage water heaters with input capacity ˃ 75,000 Btu/h and ≤ 105,000 Btu/h must comply with the requirements for the ˃ 105,000 Btu/h if the water heater either (1) has a storage volume ˃ 120 gal; (2) is designed to provide outlet hot water at temperatures greater than 180°F; or (3) uses three-phase power. | | | e | Oil storage water heaters with input capacity ˃ 105,000 Btu/h and ≤ 140,000 Btu/h must comply with the requirements for the ˃ 140,000 Btu/h if the water heater either (1) has a storage volume ˃ 120 gal; (2) is designed to provide outlet hot water at temperatures greater than 180°F; or (3) uses three-phase power. | | | f | Water heaters or gas pool heaters in this category are regulated as consumer products by the USDOE as defined in 10 C.F.R. Part 430. | | | g | Storage water heaters have a ratio of input capacity (Btu/h) to tank volume (gal) < 4000. | | | h | Instantaneous water heaters and hot water supply boilers have an input capacity (Btu/h) divided by storage volume (gal) ≥ 4000 Btu/h-gal. | | | i | There are no minimum efficiency requirements for electric heat pump water heaters greater than 12 kW or for gas heat pump water heaters. | | | j | Refer to Section C404.2.1 for additional requirements for service water heat system equipment. | | | k | A tabletop water heater is a storage water heater that is enclosed in a rectangular cabinet with a flat top surface not more than three feet (0.91 m) in height and have a ratio of input capacity (Btu/h) to tank volume (gal) < 4000. | | | l | A grid-enabled water heater is an electric resistance water heater that meets all of the following: | | | | 1. Has a rated storage tank volume of more than 75 gallons. | | | | 2. Is manufactured on or after April 16, 2015. | | | | 3. Is equipped at the point of manufacture with an activation lock. | | | | 4. Bears a permanent label applied by the manufacturer that complies with all of the following: | | | | | 4.1 Is made of material not adversely affected by water. | | | | 4.2 Is attached by means of nonwater soluble adhesive. | | | | 4.3 Advises purchasers and end-users of the intended and appropriate use of the product with the following notice printed in 16.5 point Arial Narrow Bold font: "IMPORTANT INFORMATION: This water heater is intended only for use as a part of an electric thermal storage or demand response program. It will not provide adequate hot water unless enrolled in such a program and activated by your utility company or another program operator. Confirm the availability of a program in your local area before purchasing or installing this product." |

Reviser's note: The brackets and enclosed material in the text of the above section occurred in the copy filed by the agency.

Wash. Admin. Code § 51-11C-40403 Section C404.3—Efficient heated water supply piping.

C404.3 Efficient heated water supply piping. Heated water supply piping shall be in accordance with Section C404.3.1 or C404.3.2. The flow rate through 1/4-inch (6.4 mm) piping shall be not greater than 0.5 gpm (1.9 L/m). The flow rate through 5/16-inch (7.9 mm) piping shall be not greater than 1 gpm (3.8 L/m). The flow rate through 3/8-inch (9.5 mm) piping shall be not greater than 1.5 gpm (5.7 L/m). Water heaters, circulating water systems and heat trace temperature maintenance systems shall be considered sources of heated water.

C404.3.1 Maximum allowable pipe length method. The maximum allowable piping length from the nearest source of heater water to the termination of the fixture supply pipe shall be in accordance with the following. Where the piping contains more than one size of pipe, the largest size of pipe within the piping shall be used for determining the maximum allowable length of the piping in Table C404.3.1.

1. For a public lavatory faucet, use the "Public lavatory faucets" column in Table C404.3.1.

2. For all other plumbing fixtures and plumbing appliances, use the "Other fixtures and appliances" column in Table C404.3.1.

Table C404.3.1

Piping Volume and Maximum Piping Lengths

| Nominal Pipe Size (inches) | Volume (liquid ounces per foot length) | Maximum Piping Length (feet) | | | --- | --- | --- | --- | | Public lavatory faucets | Other fixtures and appliances | | | | 1/4 | 0.33 | 6 | 50 | | 5/16 | 0.5 | 4 | 50 | | 3/8 | 0.75 | 3 | 50 | | 1/2 | 1.5 | 8 | 43 | | 5/8 | 2 | 8 | 32 | | 3/4 | 3 | 0.5 | 21 | | 7/8 | 4 | 0.5 | 16 | | 1 | 5 | 0.5 | 13 | | 1 1/4 | 8 | 0.5 | 8 | | 1 1/2 | 11 | 0.5 | 6 | | 2 or larger | 18 | 0.5 | 4 |

C404.3.2 Maximum allowable pipe volume method. The water volume in the piping shall be calculated in accordance with Section C404.3.2.1.

The volume from the nearest source of heated water to the termination of the fixture supply pipe shall be as follows:

1. For a public lavatory faucet: Not more than 2 ounces (0.06 L).

2. For other plumbing fixtures or plumbing appliances; not more than 0.5 gallon (1.89 L).

C404.3.2.1 Water volume determination. The volume shall be the sum of the internal volumes of pipe, fittings, valves, meters and manifolds between the nearest source of heated water and the termination of the fixture supply pipe. The volume in the piping shall be determined from the "Volume" column in Table C404.3.1 or from Table C404.3.2.1. The volume contained within fixture shutoff valves, within flexible water supply connectors to a fixture fitting and within a fixture fitting shall not be included in the water volume determination. Where heated water is supplied by a recirculating system or heat-traced piping, the volume shall include the portion of the fitting on the branch pipe that supplies water to the fixture.

Table C404.3.2.1

Internal Volume of Various Water Distribution Tubing

| Ounces of Water per Foot of Tube | | | | | | | | | | | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | | Nominal Size (inches) | Copper Type M | Copper Type L | Copper Type K | CPVC CTS SDR 11 | CPVC SCH 40 | CPVC SCH 80 | PE-RT SDR | Composite ASTM F1281 | PEX CTS SDR 9 | | 3/8 | 1.06 | 0.97 | 0.84 | N/A | 1.17 | — | 0.64 | 0.63 | 0.64 | | 1/2 | 1.69 | 1.55 | 1.45 | 1.25 | 1.89 | 1.46 | 1.18 | 1.31 | 1.18 | | 3/4 | 3.43 | 3.22 | 2.90 | 2.67 | 3.38 | 2.74 | 2.35 | 3.39 | 2.35 | | 1 | 5.81 | 5.49 | 5.17 | 4.43 | 5.53 | 4.57 | 3.91 | 5.56 | 3.91 | | 11/4 | 8.70 | 8.36 | 8.09 | 6.61 | 9.66 | 8.24 | 5.81 | 8.49 | 5.81 | | 11/2 | 12.18 | 11.83 | 11.45 | 9.22 | 13.20 | 11.38 | 8.09 | 13.88 | 8.09 | | 2 | 21.08 | 20.58 | 20.04 | 15.79 | 21.88 | 19.11 | 13.86 | 21.48 | 13.86 |

History

• Statutory Authority: RCW 19.27A.020, 19.27A.025, 19.27A.160 and chapters 19.27A and 19.27 RCW. WSR 22-14-091, 23-12-101, and 23-20-021, § 51-11C-40403, filed 7/1/22, 6/7/23, and 9/25/23, effective 3/15/24. Statutory Authority: RCW 19.27A.025, 19.27A.160, and 19.27.074. WSR 16-03-072, § 51-11C-40403, filed 1/19/16, effective 7/1/16. Statutory Authority: RCW 19.27A.020, 19.27A.025 and chapters 19.27 and 34.05 RCW. WSR 13-04-056, § 51-11C-40403, filed 2/1/13, effective 7/1/13.

Wash. Admin. Code § 51-11C-40404 Section C404.4—Heat traps.

C404.4 Heat traps for hot water storage tanks. Storage tank-type water heaters and hot water storage tanks that have vertical water pipes connecting to the inlet and outlet of the tank shall be provided with integral heat traps at the vertical inlets and outlets or shall have pipe-configured heat traps in the piping connected to those inlets and outlets. Tank inlets and outlets associated with solar water heating system circulation loops shall not be required to have heat traps.

History

• Statutory Authority: RCW 19.27A.020, 19.27A.025, 19.27A.160 and chapters 19.27A and 19.27 RCW. WSR 22-14-091, 23-12-101, and 23-20-021, § 51-11C-40404, filed 7/1/22, 6/7/23, and 9/25/23, effective 3/15/24. Statutory Authority: RCW 19.27A.020, 19.27A.025, 19.27A.160 and chapter 19.27 RCW. WSR 19-24-040, § 51-11C-40404, filed 11/26/19, effective 7/1/20. Statutory Authority: RCW 19.27A.020, 19.27A.025 and chapters 19.27 and 34.05 RCW. WSR 13-04-056, § 51-11C-40404, filed 2/1/13, effective 7/1/13.

Wash. Admin. Code § 51-11C-40405 Section C404.5—Water heater installation.

C404.5 Water heater installation. Electric water heaters in unconditioned spaces or on concrete floors shall be placed on an incompressible, insulated surface with a minimum thermal resistance of R-10.

History

• Statutory Authority: RCW 19.27A.020, 19.27A.025 and chapters 19.27 and 34.05 RCW. WSR 13-04-056, § 51-11C-40405, filed 2/1/13, effective 7/1/13.

Wash. Admin. Code § 51-11C-40406 Section C404.6—Pipe insulation.

C404.6 Insulation of piping. Piping from a water heater to the termination of the heated water fixture supply pipe shall be insulated in accordance with Table C403.10.3. On both the inlet and outlet piping of a storage water heater or heated water storage tank, the piping to a heat trap or the first 8 feet (2438 mm) of piping, whichever is less, shall be insulated. Piping that is heat traced shall be insulated in accordance with Table C403.10.3 or the heat trace manufacturer's instructions. Tubular pipe insulation shall be installed in accordance with the insulation manufacturer's instructions. Pipe insulation shall be continuous, including through hangers and supports, such that thermal bridging is prevented, except where the piping passes through a framing member. The minimum insulation thickness requirements of this section shall not supersede any greater insulation thickness requirements necessary for the protection of piping from freezing temperatures or the protection of personnel against external surface temperatures on the insulation.

| EXCEPTION: | Tubular pipe insulation shall not be required on the following: | | --- | --- | | | 1. The tubing from the connection at the termination of the fixture supply piping to a plumbing fixture or plumbing appliance. | | | 2. Valves, pumps, strainers and threaded unions in piping that is 1 inch (25 mm) or less in nominal diameter. | | | 3. Piping from user-controlled shower and bath mixing valves to the water outlets. | | | 4. Cold-water piping of a demand recirculation water system. | | | 5. Tubing from a hot drinking-water heating unit to the water outlet. | | | 6. Piping at locations where a vertical support of the piping is installed. | | | 7. Piping surrounded by building insulation with a thermal resistance (R-value) of not less than R-3. | | | 8. Hot water piping that is part of the final pipe run to the plumbing fixture and is not part of the heated-water circulation system circulation path is not required to meet the minimum insulation requirements of Section C404.6. |

C404.6.1 Storage tank insulation. Unfired storage tanks used to store service hot water at temperatures above 130°F (54°C) shall be wrapped with an insulating product, installed in accordance with the insulation manufacturer's instructions and providing a minimum of R-2 additional insulation for every 10°F (5°C) increase in stored water temperature above 130°F (54°C). Such additional insulation is also permitted to be integral to the tank. The insulation is permitted to be discontinuous at structural supports.

History

• Statutory Authority: RCW 19.27A.020, 19.27A.025, 19.27A.160 and chapters 19.27A and 19.27 RCW. WSR 22-14-091, 23-12-101, and 23-20-021, § 51-11C-40406, filed 7/1/22, 6/7/23, and 9/25/23, effective 3/15/24. Statutory Authority: RCW 19.27A.025, 19.27A.045 and chapter 19.27 RCW. WSR 20-21-080, § 51-11C-40406, filed 10/19/20, effective 2/1/21. Statutory Authority: RCW 19.27A.020, 19.27A.025, 19.27A.160 and chapter 19.27 RCW. WSR 19-24-040, § 51-11C-40406, filed 11/26/19, effective 7/1/20. Statutory Authority: RCW 19.27A.020, 19.27A.025 and chapters 19.27A and 19.27 RCW. WSR 19-02-089, § 51-11C-40406, filed 1/2/19, effective 7/1/19. Statutory Authority: RCW 19.27A.025, 19.27A.160, and 19.27.074. WSR 16-03-072, § 51-11C-40406, filed 1/19/16, effective 7/1/16. Statutory Authority: RCW 19.27A.020, 19.27A.025 and chapters 19.27 and 34.05 RCW. WSR 13-04-056, § 51-11C-40406, filed 2/1/13, effective 7/1/13.

Wash. Admin. Code § 51-11C-40407 Section C404.7—Heated-water circulating and temperature maintenance systems.

C404.7 Heated-water circulating and heat trace temperature maintenance systems. Heated-water circulation systems for temperature maintenance shall be in accordance with Section C404.7.1. Electric resistance heat trace systems for temperature maintenance shall be in accordance with Section C404.7.2. Controls for hot water storage shall be in accordance with Section C404.7.3. Automatic controls, temperature sensors and pumps shall be in a location with access. Manual controls shall be in a location with ready access.

C404.7.1 Circulation systems. Heated-water circulation systems shall be provided with a circulation pump. The pump shall have an electronically commutated motor with a means of adjusting motor speed for system balancing. The system return pipe shall be a dedicated return pipe. Gravity and thermo-syphon circulation systems are prohibited. Controls shall start the circulation pump based on the identification of a demand for hot water within the occupancy.

C404.7.1.1 Single riser systems. Where the circulation system serves only a single domestic hot water riser or zone, the following controls shall be provided:

1. Controls shall be configured to automatically turn off the pump when the water in the circulation loop is at the design supply temperature and shall not turn the pump back on until the temperature is a minimum of 10°F (5°C) lower than the design supply temperature.

2. Controls shall be equipped with a manual switch or other control method that can be used to turn off the circulating pump during extended periods when hot water is not required.

C404.7.1.2 Multiple riser systems. Where the circulation system serves multiple domestic hot water risers or piping zones, the following controls shall be provided:

1. Controls shall be configured to automatically turn off the circulation pump during extended periods when hot water is not required.

2. System shall include means for balancing the flow rate through each individual hot water supply riser or piping zone.

3. For circulation systems that use a variable flow circulation pump, each riser and piping zone shall have a self-actuating thermostatic balancing valve.

C404.7.1.3 Electronic thermostatic mixing valve (TMV). Where a heated water circulation system utilizes an electronic TMV to control the temperature of hot water supplied to the building, the TMV shall be configured so that it either reverts closed (fully COLD) or maintains its current valve position upon power failure or cessation of circulation flow.

C404.7.2 Heat trace systems. Electric heat trace systems shall comply with IEEE 515.1. Controls for such systems shall be able to automatically adjust the energy input to the heat tracing to maintain the desired water temperature in the piping in accordance with the times when heated water is used in the occupancy. Heat trace shall be arranged to be turned off automatically when there is no hot water demand.

C404.7.3 Controls for hot water storage. The controls on pumps that circulate water between a water heater and a heated-water storage tank shall limit operation of the pump from heating cycle startup to not greater than 5 minutes after the end of the cycle.

C404.7.3.1 Pipe insulation. For heated water circulation systems, both supply and return pipe insulation shall be at minimum 1.0 inch thicker than that required by Table C403.10.3.

| EXCEPTION: | Where piping is centered within a wall, ceiling or floor framing cavity with a depth at least 4 inches greater than the diameter of the pipe and that is completely filled with batt or blown-in insulation, additional pipe insulation is not required. | | --- | --- |

History

• Statutory Authority: RCW 19.27A.020, 19.27A.025, 19.27A.160 and chapters 19.27A and 19.27 RCW. WSR 22-14-091, 23-12-101, and 23-20-021, § 51-11C-40407, filed 7/1/22, 6/7/23, and 9/25/23, effective 3/15/24. Statutory Authority: RCW 19.27A.020, 19.27A.025, 19.27A.160 and chapter 19.27 RCW. WSR 19-24-040, § 51-11C-40407, filed 11/26/19, effective 7/1/20. Statutory Authority: RCW 19.27A.025, 19.27A.160, and 19.27.074. WSR 16-03-072, § 51-11C-40407, filed 1/19/16, effective 7/1/16. Statutory Authority: RCW 19.27A.020, 19.27A.025 and chapters 19.27 and 34.05 RCW. WSR 13-04-056, § 51-11C-40407, filed 2/1/13, effective 7/1/13.

Wash. Admin. Code § 51-11C-40408 Section C404.8—Demand recirculation controls.

C404.8 Demand recirculation controls.Demand recirculation water systems shall have controls that comply with both of the following:

1. The controls shall start the pump upon receiving a signal from the action of a user of a fixture or appliance, sensing the presence of a user of a fixture or sensing the flow of hot or tempered water to a fixture fitting or appliance.

2. The controls shall limit the temperature of the water entering the cold-water piping to not greater than 104°F (40°C).

History

• Statutory Authority: RCW 19.27A.020, 19.27A.025, 19.27A.160 and chapter 19.27 RCW. WSR 19-24-040, § 51-11C-40408, filed 11/26/19, effective 7/1/20. Statutory Authority: RCW 19.27A.025, 19.27A.160, and 19.27.074. WSR 16-03-072, § 51-11C-40408, filed 1/19/16, effective 7/1/16. Statutory Authority: RCW 19.27A.020, 19.27A.025 and chapters 19.27 and 34.05 RCW. WSR 13-04-056, § 51-11C-40408, filed 2/1/13, effective 7/1/13.

Wash. Admin. Code § 51-11C-40409 Section C404.9—Domestic hot water meters.

C404.9 Domestic hot water meters. Each individual dwelling unit in a Group R-2 occupancy with central service domestic hot water systems shall be provided with a domestic hot water meter to allow for domestic hot water billing based on actual domestic hot water usage.

| EXCEPTION: | Dwelling units in other than Group R-2 multi-family and live/work units are not required to provide domestic hot water metering at each dwelling unit where domestic hot water is metered separately for each of the following building end uses: | | --- | --- | | | 1. Dwelling units. | | | 2. Sleeping units. | | | 3. Commercial kitchens. | | | 4. Central laundries. |

History

• Statutory Authority: RCW 19.27A.020, 19.27A.025, 19.27A.160 and chapter 19.27 RCW. WSR 19-24-040, § 51-11C-40409, filed 11/26/19, effective 7/1/20. Statutory Authority: RCW 19.27A.025, 19.27A.045, 19.27.020, and 19.27.074. WSR 14-24-122, § 51-11C-40409, filed 12/3/14, effective 1/3/15. Statutory Authority: RCW 19.27A.020, 19.27A.025 and chapters 19.27 and 34.05 RCW. WSR 13-04-056, § 51-11C-40409, filed 2/1/13, effective 7/1/13.

Wash. Admin. Code § 51-11C-404091 Section C404.10—Drain water heat recovery units.

C404.10 Drain water heat recovery units. Drain water heat recovery units shall comply with CSA B55.2. Potable waterside pressure loss shall be less than 10 psi (69 kPa) at maximum design flow. For Group R occupancies, the efficiency of drain water heat recovery unit efficiency shall be in accordance with CSA B55.1.

History

• Statutory Authority: RCW 19.27A.025, 19.27A.160, and 19.27.074. WSR 16-03-072, § 51-11C-404091, filed 1/19/16, effective 7/1/16.

Wash. Admin. Code § 51-11C-40410 Section C404.11—Pools and spas.

C404.11 Energy consumption of pools and permanent spas. The energy consumption of pools and permanent spas shall be controlled by the requirements in Sections C404.11.1 through C404.11.4.

C404.11.1 Heaters. Pool water heaters using electric resistance heating as the primary source of heat are prohibited for pools over 2,000 gallons. Heat pump pool heaters shall have a minimum COP of 4.0 at 50°F (10°C) db, 44.2°F (6.8°C) wb outdoor air and 80°F (27°C) entering water, determined in accordance with AHRI 1160. Other pool heating equipment shall comply with the applicable efficiencies in Section C404.2.

The electric power to all heaters shall be controlled by an on-off switch that is an integral part of the heater, mounted on the exterior of the heater, or external to and within 3 feet of the heater in a location with ready access. Operation of such switch shall not change the setting of the heater thermostat. Such switches shall be in addition to a circuit breaker for the power to the heater. Gas-fired heaters shall not be equipped with constant burning pilot lights.

C404.11.2 Time switches. Time switches or other control method that can automatically turn off and on heaters and pump motors according to a preset schedule shall be installed for heaters and pump motors. Heaters and pump motors that have built-in time switches shall be in compliance with this section.

| EXCEPTIONS: | 1. Where public health standards require 24-hour pump operation. | | --- | --- | | | 2. Pumps that operate solar- and waste-heat-recovery pool heating systems. |

C404.11.3 Covers. Heated pools and permanent spas shall be provided with a vapor-retardant cover on or at the water surface. Pools heated to more than 90°F shall have a pool cover with a minimum insulation value of R-12, and the sides and bottom of the pool shall also have a minimum insulation value of R-12.

C404.11.4 Heat recovery. Heated indoor swimming pools, spas or hot tubs with water surface area greater than 200 square feet shall provide for energy conservation by an exhaust air heat recovery system that heats ventilation air, pool water or domestic hot water. The heat recovery system shall be configured to decrease the exhaust air temperature at design heating conditions (80°F indoor) by 36°F (10°C).

| EXCEPTION: | Pools, spas or hot tubs that include system(s) that provide equivalent recovered energy on an annual basis through one of the following methods: | | --- | --- | | | 1. Solar water heating systems not claimed in Section C406.2.5 or C407; | | | 2. Dehumidification heat recovery; | | | 3. Waste heat recovery; or | | | 4. A combination of these system sources capable of and configured to provide at least 70 percent of the heating energy required over an operating season. |

C404.12 Portable spas. The energy consumption of electric-powered portable spas shall be controlled by the requirements of APSP 14.

History

• Statutory Authority: RCW 19.27A.045 and chapter 19.27A RCW. WSR 24-16-145, § 51-11C-40410, filed 8/7/24, effective 9/7/24. Statutory Authority: RCW 19.27A.020, 19.27A.025, 19.27A.160 and chapters 19.27A and 19.27 RCW. WSR 22-14-091, 23-12-101, and 23-20-021, § 51-11C-40410, filed 7/1/22, 6/7/23, and 9/25/23, effective 3/15/24. Statutory Authority: RCW 19.27A.020, 19.27A.025, 19.27A.160 and chapter 19.27 RCW. WSR 19-24-040, § 51-11C-40410, filed 11/26/19, effective 7/1/20. Statutory Authority: RCW 19.27A.025, 19.27A.160, and 19.27.074. WSR 16-03-072, § 51-11C-40410, filed 1/19/16, effective 7/1/16. Statutory Authority: RCW 19.27A.020, 19.27A.025 and chapters 19.27 and 34.05 RCW. WSR 13-04-056, § 51-11C-40410, filed 2/1/13, effective 7/1/13.

Wash. Admin. Code § 51-11C-40413 Section C404.13—Service water pressure-booster systems.

C404.13 Servicewater pressure-booster systems. Service water pressure-booster systems shall be designed and configured such that the following apply:

1. One or more pressure sensors shall be used to vary pump speed and/or start and stop pumps. The sensors shall either be located near the critical fixtures that determine the pressure required, or logic shall be employed that adjusts the setpoint to simulate operations of remote sensors.

2. No devices shall be installed for the purpose of reducing the pressure of all of the water supplied by any booster system pump or booster system, except for safety devices.

3. Booster system pumps shall not operate when there is no service water flow except to refill hydro-pneumatic tanks.

4. System pump motors 5.0 hp and greater shall be provided with variable flow capacity in accordance with Section C403.2.4.

History

• Statutory Authority: RCW 19.27A.020, 19.27A.025, 19.27A.160 and chapters 19.27A and 19.27 RCW. WSR 22-14-091, 23-12-101, and 23-20-021, § 51-11C-40413, filed 7/1/22, 6/7/23, and 9/25/23, effective 3/15/24. Statutory Authority: RCW 19.27A.020, 19.27A.025, 19.27A.160 and chapter 19.27 RCW. WSR 19-24-040, § 51-11C-40413, filed 11/26/19, effective 7/1/20. Statutory Authority: RCW 19.27A.025, 19.27A.160, and 19.27.074. WSR 16-03-072, § 51-11C-40413, filed 1/19/16, effective 7/1/16.

Wash. Admin. Code § 51-11C-40414 Section C404.14—Demand responsive water heating.

C404.14 Demand responsive water heating. Electric storage water heaters with rated water storage volume between 40 and 120 gallons and a nameplate input rating equal to or less than 12kW shall be provided with demand responsive controls that comply with ANSI/CTA-2045-B Level 2 or another equivalent approved demand responsive control.

| EXCEPTIONS: | 1. Water heaters that provide a hot water delivery temperature of 180°F (82°C) or greater. | | --- | --- | | | 2. Water heaters that comply with Section IV, Part HLW or Section X of the ASME Boiler and Pressure Vessel Code. | | | 3. Water heaters that use three-phase electric power. | | | 4. Storage water heaters with demand responsive controls that comply with ANSI/CTA 2045-A or ANSI/CTA 2045-B Level 1, that are also capable of initiating water heating to meet the temperature setpoint in response to a demand response signal. |

History

• Statutory Authority: RCW 19.27A.020, 19.27A.025, 19.27A.160 and chapters 19.27A and 19.27 RCW. WSR 22-14-091, 23-12-101, and 23-20-021, § 51-11C-40414, filed 7/1/22, 6/7/23, and 9/25/23, effective 3/15/24.

Wash. Admin. Code § 51-11C-40415 Section C404.15—Service water heating commissioning.

C404.15 Commissioning. Service water heating systems shall be commissioned in accordance with Section C408.

History

• Statutory Authority: RCW 19.27A.020, 19.27A.025, 19.27A.160 and chapters 19.27A and 19.27 RCW. WSR 22-14-091, 23-12-101, and 23-20-021, § 51-11C-40415, filed 7/1/22, 6/7/23, and 9/25/23, effective 3/15/24.

Wash. Admin. Code § 51-11C-40500 Section C405—Electrical power and lighting systems.

History

• Statutory Authority: RCW 19.27A.020, 19.27A.025 and chapters 19.27 and 34.05 RCW. WSR 13-04-056, § 51-11C-40500, filed 2/1/13, effective 7/1/13.

Wash. Admin. Code § 51-11C-40501 Section C405.1—General.

C405.1 General. Lighting system controls, the maximum lighting power for interior and exterior applications, electrical energy consumption, vertical and horizontal transportation systems, and minimum efficiencies for motors and transformers shall comply with this section.

Sleeping units shall comply with Section C405.2.6, item 2 and Section C405.1.1 or Section C405.4.

General lighting shall consist of all lighting included when calculating the total connected interior lighting power in accordance with Section C405.4.1 and which does not require specific application controls in accordance with Section C405.2.5.

Lighting installed in walk-in coolers, walk-in freezers, refrigerated warehouse coolers and refrigerated warehouse freezers shall comply with the lighting requirements of Section C410.2.

Transformers, uninterruptable power supplies, motors and electrical power processing equipment in data center systems shall comply with Section 8 of ASHRAE Standard 90.4 in addition to this code.

| EXCEPTION: | Energy using equipment used by a manufacturing, industrial or commercial process other than maintaining comfort and amenities for the occupants are exempt from all Section C405 subsections except Section C405.8. Data center and computer room HVAC equipment is not covered by this exemption. | | --- | --- |

C405.1.1 Lighting for dwelling and sleeping units. No less than 90 percent of the permanently installed lighting serving dwelling units or sleeping units, excluding kitchen appliance lighting, shall be provided by lamps with a minimum efficacy of 65 lumens per watt or luminaires with an efficacy of not less than 45 lumens per watt.

History

• Statutory Authority: RCW 19.27A.020, 19.27A.025, 19.27A.160 and chapters 19.27A and 19.27 RCW. WSR 22-14-091, 23-12-101, and 23-20-021, § 51-11C-40501, filed 7/1/22, 6/7/23, and 9/25/23, effective 3/15/24. Statutory Authority: RCW 19.27A.020, 19.27A.025, 19.27A.160 and chapter 19.27 RCW. WSR 19-24-040, § 51-11C-40501, filed 11/26/19, effective 7/1/20. Statutory Authority: RCW 19.27A.025, 19.27A.160, and 19.27.074. WSR 16-03-072, § 51-11C-40501, filed 1/19/16, effective 7/1/16. Statutory Authority: RCW 19.27A.020, 19.27A.025 and chapters 19.27 and 34.05 RCW. WSR 13-04-056, § 51-11C-40501, filed 2/1/13, effective 7/1/13.

Wash. Admin. Code § 51-11C-40502 Section C405.2—Electrical power and lighting systems.

C405.2 Lighting controls. Lighting systems shall be provided with controls that comply with one of the following:

1. Lighting controls as specified in Sections C405.2.1 through C405.2.10.

2. Luminaire-level lighting controls (LLLC) as specified in Section C405.2.8.1.

| EXCEPTION: | Except for specific application controls required by Section C405.2.6, lighting controls are not required for the following: | | --- | --- | | | 1. Areas designated as security or emergency areas that are required to be continuously lighted. | | | 2. Means of egress illumination serving the exit access that does not exceed 0.01 watts per square foot of building area. | | | 3. Emergency egress lighting that is normally off. | | | 4. Industrial or manufacturing process areas, as may be required for production and safety. |

History

• Statutory Authority: RCW 19.27A.020, 19.27A.025, 19.27A.160 and chapters 19.27A and 19.27 RCW. WSR 22-14-091, 23-12-101, and 23-20-021, § 51-11C-40502, filed 7/1/22, 6/7/23, and 9/25/23, effective 3/15/24. Statutory Authority: RCW 19.27A.025, 19.27A.045 and chapter 19.27 RCW. WSR 20-21-080, § 51-11C-40502, filed 10/19/20, effective 2/1/21. Statutory Authority: RCW 19.27A.020, 19.27A.025, 19.27A.160 and chapter 19.27 RCW. WSR 19-24-040, § 51-11C-40502, filed 11/26/19, effective 7/1/20. Statutory Authority: RCW 19.27A.025, 19.27A.160, and 19.27.074. WSR 16-03-072, § 51-11C-40502, filed 1/19/16, effective 7/1/16. Statutory Authority: RCW 19.27A.020, 19.27A.025 and chapters 19.27 and 34.05 RCW. WSR 13-04-056, § 51-11C-40502, filed 2/1/13, effective 7/1/13.

Wash. Admin. Code § 51-11C-405021 Section C405.2.1—Occupant sensor controls.

C405.2.1 Occupant sensor controls. Occupant sensor controls shall be installed to control luminaires in the space types listed in Table C405.2.1, and shall comply with the requirements listed in the table.

| EXCEPTIONS: | 1. Corridors in manufacturing facilities. | | --- | --- | | | 2. General lighting and task lighting in shop and laboratory classrooms. | | | 3. Luminaires that are required to have specific application controls in accordance with Section C405.2.6 unless specifically required to comply with this section by Section C405.2.6. |

Table C405.2.1

Occupant Sensor Compliance Requirements for Space Types

| Space Type | Comply with Section | | --- | --- | | Classrooms/lecture/training rooms | C405.2.1.1 | | Conference/meeting/multipurpose rooms | C405.2.1.1 | | Copy/print rooms | C405.2.1.1 | | Lounge/breakrooms | C405.2.1.1 | | Enclosed offices | C405.2.1.1 | | Open plan office areas | C405.2.1.3 | | Restrooms | C405.2.1.1 | | Storage rooms | C405.2.1.1 | | Locker rooms | C405.2.1.1 | | Other spaces 300 square feet (28 m2) or less that are enclosed by floor-to-ceiling height partitions | C405.2.1.1 | | Warehouse storage areas | C405.2.1.2 | | Library stacks | C405.2.1.2 | | Enclosed fire rated stairways | C405.2.1.5 | | Corridors | C405.2.1.6 |

C405.2.1.1 Occupant sensor control function. Occupant sensor controls for the space types listed in Section C405.2.1 shall comply with all of the following:

1. They shall be configured to automatically turn off lights within 20 minutes of all occupants leaving the space.

2. They shall be manual on or configured to automatically turn the lighting on to not more than 50 percent power.

3. They shall incorporate a manual control to allow occupants to turn lights off.

| EXCEPTION: | Full automatic-on controls with no manual control shall be permitted in corridors, interior parking areas, stairways, restrooms, locker rooms, library stacks, lobbies, and areas where manual operation would endanger occupant safety or security. | | --- | --- |

C405.2.1.2 Occupant sensor control function in warehouse storage areas andlibrary stacks. Lighting in library stacks and warehouse storage areas shall be controlled as follows.

1. Lighting in each aisleway shall be controlled independently of lighting in all other aisleways and open areas.

2. Occupant sensors shall automatically reduce lighting power within each controlled area to an unoccupied setpoint of not more than 50 percent within 20 minutes after all occupants have left the controlled area.

3. Lights which are not turned off by occupant sensors shall be turned off by time schedule sweep to turn lighting off within 20 minutes of all occupants leaving the space, or comply with Section C405.2.2 to turn lighting off when the building is vacant.

4. Restore lighting to full power or target light level when occupants enter the space.

5. A manual control shall be provided to allow occupants to turn off lights in the space.

C405.2.1.3 Occupant sensor control function in open plan office areas. Occupant sensor controls in open plan office spaces less than 300 square feet (28 m2) in area shall comply with Section C405.2.1.1. Occupant sensor controls in all other open plan office spaces shall be configured to comply with all of the following:

1. General lighting is controlled separately in control zones with floor areas not greater than 600 square feet (55 m2) within the open plan office space.

2. General lighting in each control zone shall be permitted to automatically turn on upon occupancy within the control zone. General lighting in other unoccupied zones within the open plan office space shall be permitted to turn on to not more than 20 percent of full power or remain unaffected.

3. Automatically turn off general lighting in all control zones within 20 minutes after all occupants have left the open plan office space.

4. General lighting in each control zone shall turn off or uniformly reduce lighting power to an unoccupied setpoint of not more than 20 percent of full power within 20 minutes after all occupants have left the control zone.

5. Lighting controls in open plan office areas larger than 5,000 square feet must also comply with Section C405.2.8.

C405.2.1.4 Occupant sensor control function in enclosed fire rated stairways. Occupant sensor controls shall be configured to automatically reduce lighting power by not less than 50 percent when no occupants have been detected in the stairway for a period not exceeding 20 minutes and restore lighting to full power when occupants enter the stairway. All portions of stairways shall remain illuminated to meet the requirements of Sections 1008 and 1025 of the International Building Code when the lighting power is reduced.

C405.2.1.5 Occupant sensor control function in corridors. Occupant sensor controls in corridors shall uniformly reduce lighting power to an unoccupied setpoint of not more than 50 percent of full power within 20 minutes after all occupants have left the space.

| EXCEPTION: | Corridors provided with less than two foot-candles of illumination on the floor at the darkest point with all lights on. | | --- | --- |

History

• Statutory Authority: RCW 19.27A.045 and chapter 19.27A RCW. WSR 24-16-145, § 51-11C-405021, filed 8/7/24, effective 9/7/24. Statutory Authority: RCW 19.27A.020, 19.27A.025, 19.27A.160 and chapters 19.27A and 19.27 RCW. WSR 22-14-091, 23-12-101, and 23-20-021, § 51-11C-405021, filed 7/1/22, 6/7/23, and 9/25/23, effective 3/15/24. Statutory Authority: RCW 19.27A.025, 19.27A.045 and chapter 19.27 RCW. WSR 20-21-080, § 51-11C-405021, filed 10/19/20, effective 2/1/21. Statutory Authority: RCW 19.27A.020, 19.27A.025, 19.27A.160 and chapter 19.27 RCW. WSR 19-24-040, § 51-11C-405021, filed 11/26/19, effective 7/1/20. Statutory Authority: RCW 19.27A.025, 19.27A.160, and 19.27.074. WSR 16-03-072, § 51-11C-405021, filed 1/19/16, effective 7/1/16. Statutory Authority: RCW 19.27A.020, 19.27A.025 and chapters 19.27 and 34.05 RCW. WSR 13-04-056, § 51-11C-405021, filed 2/1/13, effective 7/1/13.

Wash. Admin. Code § 51-11C-405022 Section C405.2.2—Time switch controls.

C405.2.2 Time switch controls. Each area of the building that is not provided with occupant sensor controls complying with Section C405.2.1.1 shall be provided with time switch controls complying with Section C405.2.2.1.

| EXCEPTIONS: | 1. Luminaires which are required to have specific application controls in accordance with Section C405.2.6 unless specifically required to comply with this section by Section C405.2.6. | | --- | --- | | | 2. Spaces where patient care is directly provided. | | | 3. Spaces where an automatic shutoff would endanger occupant safety or security. | | | 4. Lighting intended for continuous operation. | | | 5. Shop and laboratory classrooms. |

C405.2.2.1 Time switch control function. Time switch controls shall comply with the following:

1. Have a minimum 7 day clock.

2. Be capable of being set for 7 different day types per week.

3. Incorporate an automatic holiday "shut-off" feature, which turns off all controlled lighting loads for at least 24 hours and then resumes normally scheduled operations.

4. Have program back-up capabilities, which prevent the loss of program and time settings for at least 10 hours, if power is interrupted.

5. Include an override switching device that complies with the following:

5.1. The override switch shall be a manual control.

5.2. The override switch, when initiated, shall permit the controlled lighting to remain on for not more than 2 hours.

5.3. Any individual override switch shall control the lighting for an area not larger than 5,000 square feet (465 m2).

6. Time switch controls are allowed to automatically turn on lighting to full power in corridors, lobbies, restrooms, storage rooms less than 50 square feet, and medical areas of health care facilities. In all other spaces, time switch controls are allowed to automatically turn on the lighting to not more than 50 percent power.

| EXCEPTION: | Within mall concourses, auditoriums, sales areas, manufacturing facilities, pools, gymnasiums, skating rinks, and sports arenas: | | --- | --- | | | 1. The time limit shall be permitted to be greater than 2 hours provided the switch is a captive key device. | | | 2. The area controlled by the override switch shall not be limited to 5,000 square feet (465 m2), provided that such area is less than 20,000 square feet (1860 m2). |

History

• Statutory Authority: RCW 19.27A.020, 19.27A.025, 19.27A.160 and chapters 19.27A and 19.27 RCW. WSR 22-14-091, 23-12-101, and 23-20-021, § 51-11C-405022, filed 7/1/22, 6/7/23, and 9/25/23, effective 3/15/24. Statutory Authority: RCW 19.27A.020, 19.27A.025, 19.27A.160 and chapter 19.27 RCW. WSR 19-24-040, § 51-11C-405022, filed 11/26/19, effective 7/1/20. Statutory Authority: RCW 19.27A.025, 19.27A.160, and 19.27.074. WSR 16-03-072, § 51-11C-405022, filed 1/19/16, effective 7/1/16. Statutory Authority: RCW 19.27A.020, 19.27A.025 and chapters 19.27 and 34.05 RCW. WSR 13-04-056, § 51-11C-405022, filed 2/1/13, effective 7/1/13.

Wash. Admin. Code § 51-11C-405023 Section C405.2.3—Manual controls.

C405.2.3 Manual controls. All lighting shall have manual controls complying with the following:

1. They shall be in a location with ready access to occupants.

2. They shall be located where the controlled lights are visible, or shall identify the area served by the lights and indicate their status.

3. Each control device shall control an area no larger than a single room, or 2,500 square feet, whichever is less, if the room area is less than or equal to 10,000 square feet, or one-quarter of the room area or 10,000 square feet, whichever is less, if the room area is greater than 10,000 square feet.

| EXCEPTIONS: | 1. A manual control may be installed in a remote location for the purpose of safety or security provided each remote control device has an indicator pilot light as part of or next to the control device and the light is clearly labeled to identify the controlled lighting. | | --- | --- | | | 2. Restrooms. |

History

• Statutory Authority: RCW 19.27A.020, 19.27A.025, 19.27A.160 and chapters 19.27A and 19.27 RCW. WSR 22-14-091, 23-12-101, and 23-20-021, § 51-11C-405023, filed 7/1/22, 6/7/23, and 9/25/23, effective 3/15/24. Statutory Authority: RCW 19.27A.020, 19.27A.025, 19.27A.160 and chapter 19.27 RCW. WSR 19-24-040, § 51-11C-405023, filed 11/26/19, effective 7/1/20. Statutory Authority: RCW 19.27A.025, 19.27A.160, and 19.27.074. WSR 16-03-072, § 51-11C-405023, filed 1/19/16, effective 7/1/16. Statutory Authority: RCW 19.27A.020, 19.27A.025 and chapters 19.27 and 34.05 RCW. WSR 13-04-056, § 51-11C-405023, filed 2/1/13, effective 7/1/13.

Wash. Admin. Code § 51-11C-405024 Section C405.2.4—Light-reduction controls.

C405.2.4 Light-reduction controls. Where not provided with occupant sensor controls complying with Section C405.2.1.1, general lighting shall be provided with light-reduction controls complying with Section C405.2.4.1.

| EXCEPTIONS: | 1. Luminaires controlled by daylight responsive controls complying with Section C405.2.5. | | --- | --- | | | 2. Luminaires controlled by specific application controls complying with Section C405.2.6. | | | 3. Where provided with manual control, the following areas are not required to have light reduction control: | | | 3.1. Spaces that have only one luminaire with a rated power of less than 60 watts. | | | 3.2. Spaces that use less than 0.45 watts per square foot (4.9 W/m2). | | | 3.3. Corridors, lobbies, electrical rooms and/or mechanical rooms. |

C405.2.4.1 Light-reduction control function.Manual controls shall be configured to provide light-reduction control that allows the occupant to reduce the connected lighting load by not less than 50 percent in a reasonably uniform illumination pattern with an intermediate step in addition to full on or off, or with continuous dimming control, by using one of the following or another approved method:

1. Continuous dimming of all luminaires from full output to less than 20 percent of full power.

2. Switching all luminaires to a reduced output of not less than 30 percent and not more than 70 percent of full power.

3. Switching alternate rows of luminaires or alternate luminaires to achieve a reduced output of not less than 30 percent and not more than 70 percent of full power.

History

• Statutory Authority: RCW 19.27A.045 and chapter 19.27A RCW. WSR 24-16-145, § 51-11C-405024, filed 8/7/24, effective 9/7/24. Statutory Authority: RCW 19.27A.020, 19.27A.025, 19.27A.160 and chapters 19.27A and 19.27 RCW. WSR 22-14-091, 23-12-101, and 23-20-021, § 51-11C-405024, filed 7/1/22, 6/7/23, and 9/25/23, effective 3/15/24. Statutory Authority: RCW 19.27A.020, 19.27A.025, 19.27A.160 and chapter 19.27 RCW. WSR 19-24-040, § 51-11C-405024, filed 11/26/19, effective 7/1/20. Statutory Authority: RCW 19.27A.025, 19.27A.160, and 19.27.074. WSR 16-03-072, § 51-11C-405024, filed 1/19/16, effective 7/1/16. Statutory Authority: RCW 19.27A.020, 19.27A.025 and chapters 19.27 and 34.05 RCW. WSR 13-04-056, § 51-11C-405024, filed 2/1/13, effective 7/1/13.

Wash. Admin. Code § 51-11C-405025 Section C405.2.5—Daylight responsive controls.

C405.2.5 Daylight responsive controls.Daylight responsive controls complying with Section C405.2.5.1 shall be provided to control the general lighting within daylight zones in the following spaces:

1. Spaces with a total of more than 75 watts of general lighting within primary sidelit daylight zones complying with Section C405.2.5.2.

2. Spaces with a total of more than 150 watts of general lighting within the combined primary and secondary daylight zones complying with Section C405.2.5.2.

3. Spaces with a total of more than 75 watts of general lighting within toplit daylight zones complying with Section C405.2.5.3.

| EXCEPTION: | Daylight responsive controls are not required for the following: | | --- | --- | | | 1. Spaces in health care facilities where patient care is directly provided. | | | 2. Sidelit daylight zones on the first floor above grade in Group A-2 and Group M occupancies where the fenestration adjoins a sidewalk or other outdoor pedestrian area, provided that the light fixtures are controlled separately from the general area lighting. |

C405.2.5.1 Daylight responsive controls function. Where required, daylight responsive controls shall be provided within each space for control of lights in that space and shall comply with all of the following:

1. Lights in primary sidelit daylight zones shall be controlled independently of lights in secondary sidelit daylight zones in accordance with Section C405.2.5.2.

2. Lights in toplit daylight zones in accordance with Section C405.2.5.3 shall be controlled independently of lights in sidelit daylight zones in accordance with Section C405.2.5.2.

3. Daylight responsive controls within each space shall be configured so that they can be calibrated from within that space by authorized personnel.

4. Calibration mechanisms shall be in a location with ready access.

5. Daylight responsive controls shall dim lights continuously from full light output to 15 percent of full light output or lower.

6. Daylight responsive controls shall be configured to completely shut off all controlled lights in that zone.

7. When occupant sensor controls have reduced the lighting power to an unoccupied setpoint in accordance with Sections C405.2.1.2 through C405.2.1.4, daylight responsive controls shall continue to adjust electric light levels in response to available daylight but shall be configured to not increase the lighting power above the specified unoccupied setpoint.

8. Lights in sidelit daylight zones in accordance with Section C405.2.5.2 facing different cardinal orientations (i.e., within 45 degrees of due north, east, south, west) shall be controlled independently of each other.

| EXCEPTION: | Up to 75 watts of general lighting are permitted to be controlled together with lighting in a daylight zone facing a different cardinal orientation. | | --- | --- |

9. Incorporate time-delay circuits to prevent cycling of light level changes of less than three minutes.

10. The maximum area a single daylight responsive control device serves shall not exceed 2,500 square feet (232 m2).

11. Occupant override capability of daylight dimming controls is not permitted, other than a reduction of light output from the level established by the daylighting controls.

C405.2.5.1.1 Dimming.Daylight responsive controls shall be configured to automatically reduce the power of general lighting in the daylight zone in response to available daylight, while maintaining uniform illumination in the space through one of the following methods:

1. Continuous dimming using dimming ballasts/dimming drivers and daylight-sensing controls. The system shall reduce lighting power continuously to less than 15 percent of rated power at maximum light output.

2. Stepped dimming using multi-level switching and daylight-sensing controls. The system shall provide a minimum of two steps of uniform illumination between 0 percent and 100 percent of rated power at maximum light output. Each step shall be in equal increments of power, plus or minus 10 percent.

General lighting within daylight zones in offices, classrooms, laboratories, and library reading rooms shall use the continuous dimming method. Stepped dimming is not allowed as a method of daylight zone control in these spaces.

C405.2.5.2 Sidelit daylight zone. The sidelit daylight zone is the floor area adjacent to vertical fenestration which complies with the following:

1. Where the fenestration is located in a wall, the primary sidelit daylight zone shall extend laterally to the nearest full height wall, or up to 1.0 times the height from the floor to the top of the fenestration, and longitudinally from the edge of the fenestration to the nearest full height wall, or up to 0.5 times the height from the floor to the top of the fenestration, whichever is less, as indicated in Figure C405.2.5.2(1).

2. The secondary sidelit daylight zone is directly adjacent to the primary daylight zone and shall extend laterally to 2.0 times the height from the floor to the top of the fenestration or to the nearest full height wall, whichever is less, and longitudinally from the edge of the fenestration to the nearest full height wall or up to 2 feet, whichever is less, as indicated in Figure C405.2.5.2(1).

3. Where clerestory fenestration is located in a wall, the sidelit daylight zone includes a lateral area twice the depth of the clerestory fenestration height, projected upon the floor at a 45 degree angle from the center of the clerestory fenestration. The longitudinal width of the sidelit daylight zone is calculated the same as for fenestration located in a wall. Where the 45 degree angle is interrupted by an obstruction greater than 0.7 times the ceiling height, the sidelit daylight zone shall remain the same lateral area but be located between the clerestory and the obstruction, as indicated in Figure C405.2.5.2(2).

4. Where the fenestration is located in a rooftop monitor, the sidelit daylight zone shall extend laterally to the nearest obstruction that is taller than 0.7 times the ceiling height, or up to 1.0 times the height from the floor to the bottom of the fenestration, whichever is less, and longitudinally from the edge of the fenestration to the nearest obstruction that is taller than 0.7 times the ceiling height, or up to 0.25 times the height from the floor to the bottom of the fenestration, whichever is less, as indicated in Figures C405.2.5.2(3) and C405.2.5.2(4).

5. If the rough opening area of a vertical fenestration assembly is less than 10 percent of the calculated primary sidelit daylight zone area for this fenestration, it does not qualify as a sidelit daylight zone.

6. The visible transmittance of the fenestration is no less than 0.20.

7. The projection factor (determined in accordance with Equation 4-5) for any overhanging projection which is shading the fenestration is not greater than 1.0 for fenestration oriented 45 degrees or less from true north, and not greater than 1.5 for all other orientations.

Figure C405.2.5.2(1)

Sidelit Daylight Zone Adjacent to Fenestration in a Wall

| | | --- |

Figure C405.2.5.2(2)

Sidelit Daylight Zone Adjacent to Clerestory Fenestration in a Wall

| | | --- |

Figure C405.2.5.2(3)

Sidelit Daylight Zone Under a Sloped Rooftop Monitor

| | | --- |

C405.2.5.3 Toplit daylight zone. The toplit daylight zone is the floor area underneath a roof fenestration assembly which complies with the following:

1. The toplit daylight zone shall extend laterally and longitudinally beyond the edge of the roof fenestration assembly to the nearest obstruction that is taller than 0.7 times the ceiling height, or up to 0.7 times the ceiling height, whichever is less, as indicated in Figure C405.2.5.3(1).

2. Where toplit daylight zones overlap with sidelit daylight zones, lights within the overlapping area shall be assigned to the toplit daylight zone.

3. The product of the visible transmittance of the roof fenestration assembly and the area of the rough opening of the roof fenestration assembly, divided by the area of the toplit daylight zone is no less than 0.008.

4. Where located under atrium fenestration, the toplit daylight zone shall include the bottom floor area directly beneath the atrium fenestration, and the top floor directly under the atrium fenestration, as indicated in Figure C405.2.5.3(4). The toplit daylight zone area at the top floor is calculated the same as for a toplit daylight zone. Intermediate levels below the top floor that are not directly beneath the atrium are not included.

Figure C405.2.5.3(1)

Toplit Daylight Zone Under a Rooftop Fenestration Assembly

| | | --- |

Figure C405.2.5.3(2)

Toplit Daylight Zone Under a Rooftop Monitor

| | | --- |

Figure C405.2.5.4

Toplit Daylight Zone Under Atrium Fenestration

| | | --- |

C405.2.5.4 Atriums. Daylight zones at atrium spaces shall be established at the top floor surrounding the atrium and at the floor of the atrium space, and not on intermediate floors, as indicated in Figure C405.2.5.4.

History

• Statutory Authority: RCW 19.27A.045 and chapter 19.27A RCW. WSR 24-16-145, § 51-11C-405025, filed 8/7/24, effective 9/7/24. Statutory Authority: RCW 19.27A.020, 19.27A.025, 19.27A.160 and chapters 19.27A and 19.27 RCW. WSR 22-14-091, 23-12-101, and 23-20-021, § 51-11C-405025, filed 7/1/22, 6/7/23, and 9/25/23, effective 3/15/24. Statutory Authority: RCW 19.27A.025, 19.27A.045 and chapter 19.27 RCW. WSR 20-21-080, § 51-11C-405025, filed 10/19/20, effective 2/1/21. Statutory Authority: RCW 19.27A.020, 19.27A.025, 19.27A.160 and chapter 19.27 RCW. WSR 19-24-040, § 51-11C-405025, filed 11/26/19, effective 7/1/20. Statutory Authority: RCW 19.27A.025, 19.27A.160, and 19.27.074. WSR 16-03-072, § 51-11C-405025, filed 1/19/16, effective 7/1/16. Statutory Authority: RCW 19.27A.020, 19.27A.025 and chapters 19.27 and 34.05 RCW. WSR 13-04-056, § 51-11C-405025, filed 2/1/13, effective 7/1/13.

Wash. Admin. Code § 51-11C-405026 Section C405.2.6—Additional lighting controls.

C405.2.6 Additional lighting controls. Specific application lighting shall be provided with controls, in addition to controls required by other sections, for the following:

1. The following lighting shall be controlled by an occupant sensor complying with Section C405.2.1.1 or a time switch control complying with Section C405.2.2.1. In addition, a manual control shall be provided to control such lighting separately from the general lighting in the space:

1.1. Luminaires for which additional lighting power is claimed in accordance with Section C405.4.2.2.1.

1.2. Display and accent.

1.3. Lighting in display cases.

1.4. Supplemental task lighting, including permanently installed under-shelf or under-cabinet lighting.

1.5. Lighting equipment that is for sale or demonstration in lighting education.

1.6. Display lighting for exhibits in galleries, museums and monuments that is in addition to general lighting.

2. Sleeping units shall have control device(s) or systems configured to automatically switch off all permanently installed luminaires and switched receptacles within 20 minutes after all occupants have left the unit.

| EXCEPTIONS: | 1. Lighting and switched receptacles controlled by card key controls. | | --- | --- | | | 2. Spaces where patient care is directly provided. |

3. Lighting for life support of nonhuman life forms and food warming, shall be controlled by a dedicated control that is independent of the controls for other lighting within the room or space. Each control zone shall be no greater than the area served by a single luminaire or 4,000 square feet (372 m2), whichever is larger.

4. Task lighting for medical and dental purposes that is in addition to general lighting shall be provided with a manual control.

5. Luminaires serving the exit access and providing means of egress illumination required by Section 1008.2 of the International Building Code, including luminaires that function as both normal and emergency means of egress illumination shall be controlled by a combination of listed emergency relay and occupancy sensors, or signal from another building control system, that automatically shuts off the lighting when the areas served by that illumination are unoccupied.

| EXCEPTION: | Means of egress illumination serving the exit access that does not exceed 0.01 watts per square foot (0.108 W/m2) of building area is exempt from this requirement. | | --- | --- |

History

• Statutory Authority: RCW 19.27A.020, 19.27A.025, 19.27A.160 and chapters 19.27A and 19.27 RCW. WSR 22-14-091, 23-12-101, and 23-20-021, § 51-11C-405026, filed 7/1/22, 6/7/23, and 9/25/23, effective 3/15/24. Statutory Authority: RCW 19.27A.020, 19.27A.025, 19.27A.160 and chapter 19.27 RCW. WSR 19-24-040, § 51-11C-405026, filed 11/26/19, effective 7/1/20. Statutory Authority: RCW 19.27A.025, 19.27A.160, and 19.27.074. WSR 16-03-072, § 51-11C-405026, filed 1/19/16, effective 7/1/16.

Wash. Admin. Code § 51-11C-405027 Section C405.2.7—Area controls.

C405.2.7 Area controls. The maximum lighting power that may be controlled from a single switch or automatic control device shall not exceed that which is provided by a 20 ampere circuit loaded to not more than 80 percent. A master control may be installed provided the individual switches retain their capability to function independently. Circuit breakers may not be used as the sole means of switching.

| EXCEPTION: | Areas less than 5 percent of the building footprint for footprints over 100,000 ft2. | | --- | --- |

History

• Statutory Authority: RCW 19.27A.020, 19.27A.025, 19.27A.160 and chapters 19.27A and 19.27 RCW. WSR 22-14-091, 23-12-101, and 23-20-021, § 51-11C-405027, filed 7/1/22, 6/7/23, and 9/25/23, effective 3/15/24. Statutory Authority: RCW 19.27A.020, 19.27A.025, 19.27A.160 and chapter 19.27 RCW. WSR 19-24-040, § 51-11C-405027, filed 11/26/19, effective 7/1/20. Statutory Authority: RCW 19.27A.025, 19.27A.160, and 19.27.074. WSR 16-03-072, § 51-11C-405027, filed 1/19/16, effective 7/1/16.

Wash. Admin. Code § 51-11C-405028 Section C405.2.8—Advanced lighting controls.

C405.2.8 Advanced lighting controls. Any contiguous open office area larger than 5,000 square feet shall have its general lighting controlled by either:

1. Luminaire-level lighting controls (LLLC) conforming to the requirements of Section C405.2.8.1.

2. Networked lighting control (NLC) conforming to the requirements of Section C405.2.8.2.

C405.2.8.1 Luminaire-level lighting controls. Where luminaire-level lighting controls are required, they shall be configured to provide the controls or equivalent control function specified in Sections C405.2.1, C405.2.3, and C405.2.5. In addition, each LLLC luminaire shall be independently configured to:

1. Provide for continuous full range dimming.

2. Monitor occupant activity to brighten or dim lights when occupied or unoccupied, respectively.

3. Monitor ambient lighting, both electric and daylight, and brighten or dim artificial light to maintain desired light level. A maximum of 8 fixtures are permitted to be controlled together to maintain uniform light levels within a single daylight zone.

4. Allow configuration and reconfiguration of performance parameters for each control strategy including: High trim and low trim setpoints, timeouts, dimming fade rates, and sensor sensitivity adjustment.

5. Construction documents shall include a submittal of a sequence of operations including a specification outlining each of the functions required by this section.

6. Luminaires shall be configured with high end trim in accordance with Section C405.2.8.3.

C405.2.8.2 Networked lighting control (NLC). Where NLC are required, they shall be configured to provide controls and minimum function as specified in Section C405.2. In addition, each NLC luminaire shall be independently configured to:

1. Provide for continuous full range dimming.

2. Each luminaire shall be individually addressed.

| EXCEPTIONS TO ITEM 2: | | | --- | --- | | | 1. Multiple luminaires mounted on no more than 12 linear feet of a single lighting track and addressed as a single luminaire. | | | 2. Multiple linear luminaires that are ganged together to create the appearance of a single longer fixture and addressed as a single luminaire, where the total length of the combined luminaires is not more than 12 feet. |

3. Monitor occupant activity to brighten or dim lighting when occupied or unoccupied, respectively.

4. Monitor ambient lighting, both electric and daylight, and brighten or dim artificial light to maintain desired light level. A maximum of 8 fixtures are permitted to be controlled together to maintain uniform light levels within a single daylight zone.

5. Allow configuration and reconfiguration of performance parameters for each control strategy including: High trim and low trim setpoints, timeouts, dimming fade rates, and sensor sensitivity adjustment.

6. Allow for demand response load shed.

7. Construction documents shall include a submittal of a sequence of operations including a specification outlining each of the functions required by this section.

8. Luminaires shall be configured with high end trim in accordance with Section C405.2.8.3.

C405.2.8.3 High end trim. Luminaires subject to high end trim shall be initially configured with the following:

1. Programmed to limit the initial maximum lumen output or maximum lighting power to 85 percent or less of full light output or full power or to meet the target light level documented in project sequence of operations using the least amount of power.

2. High end trim power levels are allowed to automatically reset to accommodate lumen maintenance.

3. High end trim controls shall be accessible only to authorized personnel.

History

• Statutory Authority: RCW 19.27A.020, 19.27A.025, 19.27A.160 and chapters 19.27A and 19.27 RCW. WSR 22-14-091, 23-12-101, and 23-20-021 § 51-11C-405028, filed 7/1/22, 6/7/23, and 9/25/23, effective 3/15/24. Statutory Authority: RCW 19.27A.025, 19.27A.045 and chapter 19.27 RCW. WSR 20-21-080, § 51-11C-405028, filed 10/19/20, effective 2/1/21. Statutory Authority: RCW 19.27A.020, 19.27A.025, 19.27A.160 and chapter 19.27 RCW. WSR 19-24-040, § 51-11C-405028, filed 11/26/19, effective 7/1/20. Statutory Authority: RCW 19.27A.025, 19.27A.160, and 19.27.074. WSR 16-03-072, § 51-11C-405028, filed 1/19/16, effective 7/1/16.

Wash. Admin. Code § 51-11C-405029 Section C405.2.9—Exterior lighting controls.

C405.2.9 Exterior lighting controls. Exterior lighting systems shall be provided with controls that comply with Sections C405.2.9.1 through C405.2.9.4.

| EXCEPTIONS: | 1. Lighting for covered vehicle entrances or exits from buildings or parking structures where required for safety, security or eye adaption. | | --- | --- | | | 2. Lighting controlled from within dwelling units. |

C405.2.9.1 Daylight shutoff. Lights shall be configured to automatically turn off when daylight is present and satisfies the lighting needs.

C405.2.9.2 Building façade and landscape lighting. Building façade and landscaping lighting shall be configured to automatically shutoff for a minimum of 6 hours per night or from not later than 1 hour after business closing to not earlier than 1 hour before business opening, whichever is less.

| EXCEPTION: | Areas where an automatic shutoff would endanger safety or security. | | --- | --- |

C405.2.9.3 Lighting setback. Lighting that is not controlled in accordance with Section C405.2.9.2 shall comply with the following:

1. Luminaires serving outdoor parking areas and having a rated input wattage of greater than 40 watts and a mounting height of 24 feet (7315 mm) or less above the ground shall also be controlled so that the total wattage of such lighting is automatically reduced by not less than 50 percent during any time where activity has not been detected for 15 minutes or more. Not more than 1,500 watts of lighting power shall be controlled together.

2. All other lighting shall be controlled so that the total wattage of such lighting is automatically reduced by not less than 50 percent by selectively switching off or dimming luminaires at one of the following times:

2.1. From not later than 12 midnight to 6 a.m.

2.2. From not later than 1 hour after business closing to not earlier than 1 hour before business opening.

2.3. During any period when no activity has been detected for 15 minutes or more.

C405.2.9.4 Exterior time-switch control functions. Time-switch controls for exterior lighting shall comply with the following:

1. They shall have a clock capable of being programmed for not fewer than 7 days.

2. They shall be capable of being set for 7 different day types per week.

3. They shall incorporate an automatic holiday setback feature.

4. They shall have program backup capabilities that prevent the loss of program and time settings for a period of at least 10 hours in the event that power is interrupted.

History

• Statutory Authority: RCW 19.27A.020, 19.27A.025, 19.27A.160 and chapters 19.27A and 19.27 RCW. WSR 22-14-091, 23-12-101, and 23-20-021, § 51-11C-405029, filed 7/1/22, 6/7/23, and 9/25/23, effective 3/15/24.

Wash. Admin. Code § 51-11C-40503 Section C405.2.10—Parking garage lighting control.

C405.2.10 Parking garage lighting control. Parking garage lighting shall be controlled by an occupant sensor complying with Section C405.2.1.1 or a time-switch control complying with Section C405.2.2.1. Additional lighting controls shall be provided as follows:

1. Lighting power of each luminaire shall be automatically reduced by not less than 30 percent when there is no activity detected within a lighting zone for 20 minutes. Lighting zones for this requirement shall be not larger than 3,600 square feet (334.5 m2).

2. Where lighting for eye adaptation is provided at covered vehicle entrances and exits from buildings and parking structures, such lighting shall be separately controlled by a device that automatically reduces lighting power by at least 50 percent from sunset to sunrise.

3. The power to luminaires within 20 feet (6096 mm) of perimeter wall openings shall automatically reduce in response to daylight by at least 50 percent.

| EXCEPTIONS TO ITEM 3: | | | --- | --- | | | 1. Daylight transition lighting for covered vehicle entrances and exits from buildings and parking structures; each transition zone shall not exceed a depth of 66 feet inside the structure and a width of 50 feet. | | | 2. Where permanent screens or architectural elements obstruct more than 50 percent of the opening. | | | 3. Where the top of any existing adjacent structure or natural object is at least twice as high above the openings as its horizontal distance from the opening. |

History

• Statutory Authority: RCW 19.27A.020, 19.27A.025, 19.27A.160 and chapters 19.27A and 19.27 RCW. WSR 22-14-091, 23-12-101, and 23-20-021, § 51-11C-40503, filed 7/1/22, 6/7/23, and 9/25/23, effective 3/15/24. Statutory Authority: RCW 19.27A.025, 19.27A.160, and 19.27.074. WSR 16-03-072, § 51-11C-40503, filed 1/19/16, effective 7/1/16. Statutory Authority: RCW 19.27A.020, 19.27A.025 and chapters 19.27 and 34.05 RCW. WSR 13-04-056, § 51-11C-40503, filed 2/1/13, effective 7/1/13.

Wash. Admin. Code § 51-11C-405030 Section C405.3—Lighting for plant growth and maintenance.

C405.3 Lighting for plant growth and maintenance. All permanently installed luminaires used for plant growth and maintenance shall have a photosynthetic photon efficacy measured at the lamp for luminaires with serviceable or removable lamps or at the luminaire for integrated, nonserviceable luminaires of not less than 1.7 µmol/J for greenhouses and not less than 1.9 µmol/J for all other indoor growing spaces as defined in accordance with ANSI/ASABE S640.

| EXCEPTION: | Buildings with no more than 10 kW of aggregate horticultural lighting load. | | --- | --- |

History

• Statutory Authority: RCW 19.27A.020, 19.27A.025, 19.27A.160 and chapters 19.27A and 19.27 RCW. WSR 22-14-091, 23-12-101, and 23-20-021, § 51-11C-405030, filed 7/1/22, 6/7/23, and 9/25/23, effective 3/15/24.

Wash. Admin. Code § 51-11C-40504 Reserved.

History

• Statutory Authority: RCW 19.27A.020, 19.27A.025, 19.27A.160 and chapter 19.27 RCW. WSR 19-24-040, § 51-11C-40504, filed 11/26/19, effective 7/1/20. Statutory Authority: RCW 19.27A.025, 19.27A.160, and 19.27.074. WSR 16-03-072, § 51-11C-40504, filed 1/19/16, effective 7/1/16. Statutory Authority: RCW 19.27A.020, 19.27A.025 and chapters 19.27 and 34.05 RCW. WSR 13-04-056, § 51-11C-40504, filed 2/1/13, effective 7/1/13.

Wash. Admin. Code § 51-11C-40505 Section C405.4—Interior lighting power requirements.

C405.4 Interior lighting power requirements. A building complies with this section if its total connected interior lighting power calculated under Section C405.4.1 is no greater than the interior lighting power allowance calculated under Section C405.4.2.

History

• Statutory Authority: RCW 19.27A.020, 19.27A.025, 19.27A.160 and chapter 19.27 RCW. WSR 19-24-040, § 51-11C-40505, filed 11/26/19, effective 7/1/20. Statutory Authority: RCW 19.27A.025, 19.27A.160, and 19.27.074. WSR 16-03-072, § 51-11C-40505, filed 1/19/16, effective 7/1/16. Statutory Authority: RCW 19.27A.020, 19.27A.025 and chapters 19.27 and 34.05 RCW. WSR 13-04-056, § 51-11C-40505, filed 2/1/13, effective 7/1/13.

Wash. Admin. Code § 51-11C-405051 Section C405.4.1—Total connected interior lighting power.

C405.4.1 Total connected interior lighting power. The total connected interior lighting power shall be determined in accordance with Equation 4-13.

TCLP = [LVL + BLL + TRK + POE + Other]

(Equation 4-13)

Where:

TCLP = Total connected lighting power (watts).

LVL = For luminaires with lamps connected directly to building power, such as line voltage lamps, the rated wattage of the lamp, which must be minimum 60 lumens/watt.

BLL = For luminaires incorporating a ballast or transformer, the rated input wattage of the ballast or transformer when operating the lamp.

TRK = For lighting track, cable conductor, rail conductor and plug-in busway systems that allow the addition and relocation of luminaires without rewiring, the wattage shall be one of the following:

1. The specified wattage of the luminaires, but not less than 16 W/lin. ft. (52 W/lin. m).

2. The wattage limit of the permanent current limiting devices protecting the system.

3. The wattage limit of the transformer supplying the system.

POE = For other modular lighting systems served with power supplied by a driver, power supply for transformer including, but not limited to, low-voltage lighting systems, the wattage of the system shall be the maximum rated input wattage of the driver, power supply or transformed published in the manufacturer's catalogs, as specified by UL 2108 or 8750. For power-over-Ethernet lighting systems, power provided to installed nonlighting devices may be subtracted from the total power rating of the power-over-Ethernet systems.

Other = The wattage of all other luminaires and lighting, sources not covered above and associated with interior lighting verified by data supplied by the manufacturer or other approved sources.

The connected power associated with the following lighting equipment is not included in calculating total connected lighting power.

1. Television broadcast lighting for playing areas in sports arenas.

2. Emergency lighting automatically off during normal building operation.

3. Lighting in spaces specifically designed for use by occupants with special lighting needs including those with visual impairment and other medical and age-related issues.

4. Casino gaming areas.

5. General area lighting power in industrial and manufacturing occupancies dedicated to the inspection or quality control of goods and products.

6. Mirror lighting in dressing rooms.

7. Task lighting for medical and dental purposes that is in addition to general lighting.

8. Display lighting for exhibits in galleries, museums and monuments that is in addition to general lighting.

9. Lighting for theatrical purposes, including performance, stage, film production and video production.

10. Lighting for photographic processes.

11. Lighting integral to equipment or instrumentation and installed by the manufacturer.

12. Task lighting for plant growth or maintenance where the lamp efficacy is not less than 90 lumens per watt.

13. Advertising signage or directional signage.

14. Lighting for food warming.

15. Lighting equipment that is for sale.

16. Lighting demonstration equipment in lighting education facilities.

17. Lighting approved because of safety considerations.

18. Lighting in retail display windows, provided the display area is enclosed by ceiling-height partitions.

19. Furniture mounted supplemental task lighting that is controlled by automatic shutoff.

20. Exit signs.

21. Lighting used for aircraft painting.

22. Antimicrobial lighting used for the sole purpose of disinfecting a space.

Reviser's note: The brackets and enclosed material in the text of the above section occurred in the copy filed by the agency.

Wash. Admin. Code § 51-11C-405052 Section C405.4.2—Interior lighting power requirements.

C405.4.2 Interior lighting power allowance. The total interior lighting power allowance (watts) for an entire building shall be determined according to Table C405.4.2(1) using the Building Area Method, or Table C405.4.2(2) using the Space-by-Space Method. The interior lighting power allowance for projects that involve only portions of a building shall be determined according to Table C405.4.2(2) using the Space-by-Space Method. Buildings with unfinished spaces shall use the Space-by-Space Method.

C405.4.2.1 Building area method. For the Building Area Method, the interior lighting power allowance is calculated as follows:

1. For each building area type inside the building, determine the applicable building area type and the allowed lighting power density for that type from Table C405.4.2(1). For building area types not listed, select the building area type that most closely represents the use of that area. For the purposes of this method, an "area" shall be defined as all contiguous spaces that accommodate or are associated with a single building area type.

2. Determine the floor area for each building area type listed in Table C405.4.2(1) and multiply this area by the applicable value from Table C405.4.2(1) to determine the lighting power (watts) for each building area type.

3. The total interior lighting power allowance (watts) for the entire building is the sum of the lighting power from each building area type.

C405.4.2.2 Space-by-Space Method. Where a building has a space designated as unfinished, neither the area nor the lighting power in the space shall be calculated as part of the LPA. For the Space-by-Space Method, the interior lighting power allowance is calculated as follows:

1. For each area enclosed by partitions that are not less than 80 percent of the ceiling height determine the applicable space type from Table C405.4.2(2). For space types not listed, select the space type that most closely represents the proposed use of the space. Where a space has multiple functions, that space shall be broken up into smaller subspaces, each using their own space type. If an entire space has multiple functions that necessitate a higher lighting power allowance in order to serve one of the primary functions, the higher allowance is permitted to be used.

2. Determine the total floor area of all of the spaces of each space type and multiply by the value for the space type in Table C405.4.2(2) to determine the lighting power (watts) for each space type.

3. The total interior lighting power allowance (watts) shall be the sum of the lighting power allowances for all space types.

C405.4.2.2.1 Additional interior lighting power. Where using the Space-by-Space Method, an increase in the interior lighting power allowance is permitted for specific lighting functions. Additional power shall be permitted only where the specified lighting is installed in addition to and automatically controlled separately from general lighting, in accordance with Section C405.2.6. This additional power shall be used only for the specified luminaires and shall not be used for any other purpose.

An increase in the interior lighting power allowance is permitted for lighting equipment to be installed in sales areas specifically to highlight merchandise. The additional lighting power shall be determined in accordance with Equation 4-14.

(Equation 4-14)

Additional Interior Lighting Power Allowance = 500 watts + (Retail Area 1 × 0.45 W/ft2) + (Retail Area 2 × 0.45 W/ft2) + (Retail Area 3 × 1.05 W/ft2) + (Retail Area 4 × 1.87 W/ft2).

Where:

Retail Area 1 = The floor area for all products not listed in Retail Area 2, 3 or 4.

Retail Area 2 = The floor area used for the sale of vehicles, sporting goods and small electronics.

Retail Area 3 = The floor area used for the sale of furniture, clothing, cosmetics and artwork.

Retail Area 4 = The floor area used for the sale of jewelry, crystal and china.

| EXCEPTION: | Other merchandise categories are permitted to be included in Retail Areas 2 through 4, provided that justification documenting the need for additional lighting power based on visual inspection, contrast, or other critical display requirement is approved by the code official. | | --- | --- |

History

• Statutory Authority: RCW 19.27A.020, 19.27A.025, 19.27A.160 and chapters 19.27A and 19.27 RCW. WSR 22-14-091, 23-12-101, and 23-20-021, § 51-11C-405052, filed 7/1/22, 6/7/23, and 9/25/23, effective 3/15/24. Statutory Authority: RCW 19.27A.020, 19.27A.025, 19.27A.160 and chapter 19.27 RCW. WSR 19-24-040, § 51-11C-405052, filed 11/26/19, effective 7/1/20. Statutory Authority: RCW 19.27A.025, 19.27A.160, and 19.27.074. WSR 16-03-072, § 51-11C-405052, filed 1/19/16, effective 7/1/16. Statutory Authority: RCW 19.27A.020, 19.27A.025 and chapters 19.27 and 34.05 RCW. WSR 13-04-056, § 51-11C-405052, filed 2/1/13, effective 7/1/13.

Wash. Admin. Code § 51-11C-405053 Table C405.4.2(1)—Interior lighting power allowances—Building area method.

Table C405.4.2(1)

Interior Lighting Power Allowances—Building Area Method

| Building Area Type | LPD(w/ft2) | | --- | --- | | Automotive facility | 0.64 | | Convention center | 0.64 | | Court house | 0.79 | | Dining: Bar lounge/leisure | 0.79 | | Dining: Cafeteria/fast food | 0.72 | | Dining: Family | 0.71 | | Dormitory | 0.46 | | Exercise center | 0.67 | | Fire station | 0.54 | | Gymnasium | 0.75 | | Health care clinic | 0.70 | | Hospital | 0.84 | | Hotel/motel | 0.56 | | Library | 0.83 | | Manufacturing facility | 0.82 | | Motion picture theater | 0.44 | | Multiple family | 0.41 | | Museum | 0.55 | | Office | 0.64 | | Parking garage | 0.14 | | Penitentiary | 0.65 | | Performing arts theater | 0.84 | | Police station | 0.66 | | Post office | 0.65 | | Religious building | 0.67 | | Retail | 0.84 | | School/university | 0.70 | | Sports arena | 0.62 | | Town hall | 0.69 | | Transportation | 0.50 | | Warehouse | 0.40 | | Workshop | 0.91 |

History

• Statutory Authority: RCW 19.27A.020, 19.27A.025, 19.27A.160 and chapters 19.27A and 19.27 RCW. WSR 22-14-091, 23-12-101, and 23-20-021, § 51-11C-405053, filed 7/1/22, 6/7/23, and 9/25/23, effective 3/15/24. Statutory Authority: RCW 19.27A.020, 19.27A.025, 19.27A.160 and chapter 19.27 RCW. WSR 19-24-040, § 51-11C-405053, filed 11/26/19, effective 7/1/20. Statutory Authority: RCW 19.27A.025, 19.27A.160, and 19.27.074. WSR 16-03-072, § 51-11C-405053, filed 1/19/16, effective 7/1/16. Statutory Authority: RCW 19.27A.020, 19.27A.025 and chapters 19.27 and 34.05 RCW. WSR 13-04-056, § 51-11C-405053, filed 2/1/13, effective 7/1/13.

Wash. Admin. Code § 51-11C-405054 Table C405.4.2(2)—Interior lighting power allowances—Space-by-space method.

Table C405.4.2(2)

Interior Lighting Power Allowances—Space-by-Space Method

| Common Space-by-Space Typesa,j | LPD (w/ft2) | | | --- | --- | --- | | Atrium - Less than 20 feet in height | 0.39 | | | Atrium - 20 to 40 feet in height | 0.48 | | | Atrium - Above 40 feet in height | 0.60 | | | Audience/seating area - Permanenti | | | | | In an auditorium | 0.61 | | | In a gymnasium | 0.23 | | | In a motion picture theater | 0.27 | | | In a penitentiary | 0.67 | | | In a performing arts theater | 1.16 | | | In a religious building | 0.72 | | | In a sports arena | 0.33 | | | Otherwise | 0.23 | | Banking activity areai | 0.61 | | | Breakroom (see lounge/breakroom) | | | | Classroom/lecture hall/training room | | | | | In a penitentiary | 0.89 | | | Otherwiseh | 0.71 | | Computer room, data center | 0.94 | | | Conference/meeting/multipurpose | 0.97 | | | Confinement cell | 0.70 | | | Copy/print room | 0.31 | | | Corridor | | | | | In a facility for the visually impaired (and not used primarily by the staff)b | 0.71 | | | In a hospital | 0.71 | | | In a manufacturing facility | 0.41 | | | Otherwisec,i | 0.41 | | Courtroomc | 1.20 | | | Dining area | | | | | In a penitentiary | 0.42 | | | In a facility for the visually impaired (and not used primarily by the staff)b | 1.27 | | | In a bar/lounge or leisure diningi | 0.86 | | | In cafeteria or fast food dining | 0.40 | | | In a family dining areai | 0.60 | | | Otherwise | 0.43 | | Electrical/mechanical | 0.43 | | | Emergency vehicle garage | 0.52 | | | Food preparation | 1.09 | | | Guest rooma,b | 0.41 | | | Laboratory | | | | | In or as a classroom | 1.11 | | | Otherwise | 1.33 | | Laundry/washing area | 0.53 | | | Loading dock, interior | 0.88 | | | Lobbyc | | | | | In a facility for the visually impaired (and not used primarily by the staff)b | 1.69 | | | For an elevator | 0.65 | | | In a hotel | 0.51 | | | In a motion picture theater | 0.23 | | | In a performing arts theater | 1.25 | | | Otherwise | 0.84 | | Locker room | 0.52 | | | Lounge/breakroomi | | | | | In a health care facilityc,i | 0.42 | | | Otherwisei | 0.59 | | Office | | | | | Enclosed ≤ 250 | 0.74 | | | Enclosed ˃ 250 | 0.66 | | | Open plan | 0.61 | | Parking area, interior | 0.15 | | | Pharmacy area | 1.66 | | | Restroom | | | | | In a facility for the visually impaired (and not used primarily by the staff)b | 1.26 | | | Otherwisei | 0.63 | | Sales area | 1.05 | | | Seating area, general | 0.23 | | | Stairway (see space containing stairway) | | | | Stairwellc,i | 0.49 | | | Storage room | | | | | < 50 ft2 | 0.51 | | | 50-100 ft2 | 0.38 | | | All other storage | 0.38 | | Vehicular maintenance | 0.60 | | | Workshop | 1.26 | |

| Building Specific Space-by-Space Typesa | LPD (w/ft2) | | | --- | --- | --- | | Automotive (see vehicular maintenance) | | | | Convention center - Exhibit spacei | 0.61 | | | Dormitory living quartersa,b | 0.50 | | | Facility for the visually impairedb | | | | | In a chapel (and not used primarily by the staff)b | 0.70 | | | In a recreation room (and not used primarily by the staff)b | 1.77 | | Fire stations | | | | | Sleeping quarters | 0.23 | | Gymnasium/fitness center | | | | | In an exercise area | 0.90 | | | In a playing area | 0.85 | | Health care facilityc,i | | | | | In an exam/treatment room | 1.40 | | | In an imaging room | 0.94 | | | In a medical supply room | 0.62 | | | In a nursery | 0.92 | | | In a nurse's station | 1.17 | | | In an operating room | 2.26 | | | In a patient room | 0.68 | | | In a physical therapy room | 0.91 | | | In a recovery room | 1.25 | | Library | | | | | In a reading areai | 0.96 | | | In the stacks | 1.10 | | Manufacturing facility | | | | | In a detailed manufacturing area | 0.80 | | | In an equipment room | 0.76 | | | In an extra high bay area (greater than 50-foot floor-to-ceiling height) | 1.42 | | | In a high bay area (25 - 50-foot floor-to-ceiling height) | 1.24 | | | In a low bay (< 25-foot floor-to-ceiling height) | 0.86 | | Museum | | | | | In a general exhibition areai | 0.31 | | | In a restoration room | 1.10 | | Performing arts theater dressing/fitting room | 0.41 | | | Post office - Sorting area | 0.76 | | | Religious buildings | | | | | In a fellowship halli | 0.54 | | | In a worship/pulpit/choir areai | 0.85 | | Retail facilities | | | | | In a dressing/fitting room | 0.51 | | | In a mall concourse | 0.82 | | Sports arena - Playing area | | | | | For a Class 1 facilityd | 2.94 | | | For a Class 2 facilitye | 2.01 | | | For a Class 3 facilityf | 1.30 | | | For a Class 4 facilityg | 0.86 | | Transportation | | | | | In a baggage/carousel area | 0.39 | | | In an airport concourse | 0.25 | | | At a terminal ticket counteri | 0.51 | | Warehouse - Storage area | | | | | For medium to bulky palletized items | 0.33 | | | For smaller, hand-carried items | 0.69 |

| For SI: 1 foot = 304.8 mm, 1 watt per square foot = 10.76 W/m2. | | | --- | --- | | a | In cases where both a common space type and a building area specific space type are listed, the building area specific space type shall apply. | | b | A facility for the visually impaired is a facility that is licensed or will be licensed by local or state authorities for senior long-term care, adult daycare, senior support or people with special visual needs. | | c | Additional lighting power allowance of 0.2 watts per square foot for the purpose of highlighting art or exhibits. This additional power allowance shall be permitted only where the specified lighting is installed in addition to and controlled separately from general lighting in accordance with Section C405.2.6. This additional power allowance shall be used only for the specified luminaires and shall not be used for any other purpose and it shall not be added to any other space or the interior power allowance. | | d | Class I facilities consist of professional facilities; and semiprofessional, collegiate or club facilities with seating for 5,000 or more spectators. | | e | Class II facilities consist of collegiate and semiprofessional facilities with seating for fewer than 5,000 spectators; club facilities with seating between 2,000 and 5,000 spectators; and amateur league and high school facilities with seating for more than 2,000 spectators. | | f | Class III facilities consist of club, amateur league and high school facilities with seating for 2,000 or fewer spectators. | | g | Class IV facilities consist of elementary school and recreational facilities; and amateur league and high school facilities without provisions for spectators. | | h | For classrooms, additional lighting power allowance of 4.50 W/lineal foot of white or chalk boards for directional lighting dedicated to white or chalk boards. | | i | Additional lighting power allowance of 0.15 W/ft2 for ornamental lighting. Qualifying ornamental lighting includes luminaires that are specifically used in a decorative manner. This additional power shall be permitted only where the specified lighting is installed in addition to and controlled separately from display or general lighting in accordance with Section C405.2.6. This additional power shall be used only for the specified luminaires and it shall not be added to any other space or the interior power allowance. | | j | Where a space is designated as unfinished, neither the area nor the lighting power in the space shall be calculated as part of the LPA. |

History

• Statutory Authority: RCW 19.27A.045 and chapter 19.27A RCW. WSR 24-16-145, § 51-11C-405054, filed 8/7/24, effective 9/7/24. Statutory Authority: RCW 19.27A.020, 19.27A.025, 19.27A.160 and chapters 19.27A and 19.27 RCW. WSR 22-14-091, 23-12-101, and 23-20-021, § 51-11C-405054, filed 7/1/22, 6/7/23, and 9/25/23, effective 3/15/24. Statutory Authority: RCW 19.27A.025, 19.27A.045 and chapter 19.27 RCW. WSR 20-21-080, § 51-11C-405054, filed 10/19/20, effective 2/1/21. Statutory Authority: RCW 19.27A.020, 19.27A.025, 19.27A.160 and chapter 19.27 RCW. WSR 19-24-040, § 51-11C-405054, filed 11/26/19, effective 7/1/20. Statutory Authority: RCW 19.27A.025, 19.27A.160, and 19.27.074. WSR 16-03-072, § 51-11C-405054, filed 1/19/16, effective 7/1/16. Statutory Authority: RCW 19.27A.020, 19.27A.025 and chapters 19.27 and 34.05 RCW. WSR 13-04-056, § 51-11C-405054, filed 2/1/13, effective 7/1/13.

Wash. Admin. Code § 51-11C-40506 Section C405.5—Exterior lighting.

C405.5 Exterior lighting power requirements. The total connected exterior lighting power calculated in accordance with Section C405.5.2 shall not be greater than the exterior lighting power allowance calculated in accordance with Section C405.5.3.

History

• Statutory Authority: RCW 19.27A.020, 19.27A.025, 19.27A.160 and chapter 19.27 RCW. WSR 19-24-040, § 51-11C-40506, filed 11/26/19, effective 7/1/20. Statutory Authority: RCW 19.27A.025, 19.27A.160, and 19.27.074. WSR 16-03-072, § 51-11C-40506, filed 1/19/16, effective 7/1/16. Statutory Authority: RCW 19.27A.020, 19.27A.025 and chapters 19.27 and 34.05 RCW. WSR 13-04-056, § 51-11C-40506, filed 2/1/13, effective 7/1/13.

Wash. Admin. Code § 51-11C-405061 Section C405.5.1—Exterior building grounds lighting.

C405.5.1 Exterior building grounds lighting. All exterior building grounds luminaires that operate at greater than 25 watts shall have a minimum efficacy of 100 lumens per watt.

| EXCEPTIONS: | 1. Luminaires controlled by a motion sensor. | | --- | --- | | | 2. Luminaires that qualify for one of the exceptions under Section C405.5.2. |

History

• Statutory Authority: RCW 19.27A.020, 19.27A.025, 19.27A.160 and chapters 19.27A and 19.27 RCW. WSR 22-14-091, 23-12-101, and 23-20-021, § 51-11C-405061, filed 7/1/22, 6/7/23, and 9/25/23, effective 3/15/24. Statutory Authority: RCW 19.27A.020, 19.27A.025, 19.27A.160 and chapter 19.27 RCW. WSR 19-24-040, § 51-11C-405061, filed 11/26/19, effective 7/1/20. Statutory Authority: RCW 19.27A.025, 19.27A.160, and 19.27.074. WSR 16-03-072, § 51-11C-405061, filed 1/19/16, effective 7/1/16. Statutory Authority: RCW 19.27A.020, 19.27A.025 and chapters 19.27 and 34.05 RCW. WSR 13-04-056, § 51-11C-405061, filed 2/1/13, effective 7/1/13.

Wash. Admin. Code § 51-11C-405062 Section C405.5.2—Exterior building lighting power.

C405.5.2 Total connected exterior building lighting power. The total exterior connected lighting power shall be the total maximum rated wattage of all exterior lighting that is powered through the energy service for the building.

| EXCEPTION: | Lighting used for the following applications shall not be included: | | --- | --- | | | 1. Lighting approved because of safety considerations; | | | 2. Emergency lighting automatically off during normal business operation; | | | 3. Exit signs; | | | 4. Specialized signal, directional and marker lighting associated with transportation; | | | 5. Advertising signage or directional signage; | | | 6. Integral to equipment or instrumentation and is installed by its manufacturer; | | | 7. Theatrical purposes, including performance, stage, film production and video production; | | | 8. Athletic playing areas; | | | 9. Temporary lighting; | | | 10. Industrial production, material handling, transportation sites and associated storage areas; | | | 11. Theme elements in theme/amusement parks; | | | 12. Lighting integrated within or used to highlight features of art, public monuments and the national flag; | | | 13. Lighting for water features and swimming pools; and | | | 14. Lighting that is controlled from within dwelling units, where the lighting complies with Section R404.1. |

C405.5.3 Exterior lighting power allowance. The exterior lighting power allowance (watts) is calculated as follows:

1. Determine the Lighting Zone (LZ) for the building according to Table C405.5.3(1), unless otherwise specified by the code official.

2. For each exterior area that is to be illuminated by lighting that is powered through the energy service for the building, determine the applicable area type from Table C405.5.3(2). For area types not listed, select the area type that most closely represents the proposed use of the area. Covered parking garage lighting is not considered exterior lighting for the purposes of this calculation.

3. Determine the total area or length of each area type and multiply by the value for the area type in Table C405.5.3(2) to determine the lighting power (watts) allowed for each area type.

4. The total exterior lighting power allowance (watts) is the sum of the base site allowance determined according to Table C405.5.3(2), plus the watts from each area type.

C405.5.3.1 Additional exterior lighting power. Additional exterior lighting power allowances are available for the specific lighting applications listed in Table C405.5.3(3). These additional power allowances shall be used only for the luminaires serving these applications and shall not be used to increase any other lighting power allowance.

C405.5.4 Gas lighting. Gas-fired lighting appliances shall not be equipped with continuously burning pilot ignition systems.

History

• Statutory Authority: RCW 19.27A.020, 19.27A.025, 19.27A.160 and chapters 19.27A and 19.27 RCW. WSR 22-14-091, 23-12-101, and 23-20-021, § 51-11C-405062, filed 7/1/22, 6/7/23, and 9/25/23, effective 3/15/24. Statutory Authority: RCW 19.27A.020, 19.27A.025, 19.27A.160 and chapter 19.27 RCW. WSR 19-24-040, § 51-11C-405062, filed 11/26/19, effective 7/1/20. Statutory Authority: RCW 19.27A.025, 19.27A.160, and 19.27.074. WSR 16-03-072, § 51-11C-405062, filed 1/19/16, effective 7/1/16. Statutory Authority: RCW 19.27A.020, 19.27A.025 and chapters 19.27 and 34.05 RCW. WSR 13-04-056, § 51-11C-405062, filed 2/1/13, effective 7/1/13.

Wash. Admin. Code § 51-11C-405063 Table C405.5.3(1)—Exterior lighting zones.

Table C405.5.3(1)

Exterior Lighting Zones

| Lighting Zone | Description | | --- | --- | | 1 | Developed areas of national parks, state parks, forest land, and rural areas | | 2 | Areas predominantly consisting of residential zoning, neighborhood business districts, light industrial with limited nighttime use and residential mixed use areas | | 3 | All other areas not classified as lighting zone 1, 2, or 4 | | 4 | High-activity commercial districts in major metropolitan areas as designated by the local land use planning authority |

History

• Statutory Authority: RCW 19.27A.020, 19.27A.025, 19.27A.160 and chapter 19.27 RCW. WSR 19-24-040, § 51-11C-405063, filed 11/26/19, effective 7/1/20. Statutory Authority: RCW 19.27A.025, 19.27A.160, and 19.27.074. WSR 16-03-072, § 51-11C-405063, filed 1/19/16, effective 7/1/16. Statutory Authority: RCW 19.27A.020, 19.27A.025 and chapters 19.27 and 34.05 RCW. WSR 13-04-056, § 51-11C-405063, filed 2/1/13, effective 7/1/13.

Wash. Admin. Code § 51-11C-405064 Table C405.5.3(2)—Individual lighting power allowances for building exteriors.

Table C405.5.3(2)

Lighting Power Allowances for Building Exteriors

| | Lighting Zones | | | | | --- | --- | --- | --- | --- | | | Zone 1 | Zone 2 | Zone 3 | Zone 4 | | Base Site Allowance | 160 W | 280 W | 400 W | 560 W | | Uncovered Parking Areas | | | | | | Parking areas and drives | 0.015 W/ft2 | 0.026 W/ft2 | 0.037 W/ft2 | 0.052 W/ft2 | | Building Grounds | | | | | | Walkways and ramps less than 10 feet wide | 0.04 W/ft2 | 0.07 W/ft2 | 0.10 W/ft2 | 0.14 W/ft2 | | Walkways and ramps 10 feet wide or greater, plaza areas, special feature areas | 0.04 W/ft2 | 0.07 W/ft2 | 0.10 W/ft2 | 0.14 W/ft2 | | Dining areas | 0.156 W/ft2 | 0.273 W/ft2 | 0.390 W/ft2 | 0.546 W/ft2 | | Stairways | Exempt | Exempt | Exempt | Exempt | | Pedestrian tunnels | 0.063 W/ft2 | 0.110 W/ft2 | 0.157 W/ft2 | 0.220 W/ft2 | | Landscaping | 0.014 W/ft2 | 0.025 W/ft2 | 0.036 W/ft2 | 0.050 W/ft2 | | Building Entrances and Exits | | | | | | Pedestrian and vehicular entrances and exits | 5.6 W/linear foot of opening | 9.8 W/linear foot of opening | 14.0 W/linear foot of opening | 19.6 W/linear foot of opening | | Entry canopies | 0.072 W/ft2 | 0.126 W/ft2 | 0.180 W/ft2 | 0.252 W/ft2 | | Loading docks | 0.104 W/ft2 | 0.182 W/ft2 | 0.260 W/ft2 | 0.364 W/ft2 | | Sales Canopies | | | | | | Free standing and attached | 0.20 W/ft2 | 0.35 W/ft2 | 0.50 W/ft2 | 0.70 W/ft2 | | Outdoor Sales | | | | | | Open areas (including vehicle sales lots) | 0.072 W/ft2 | 0.126 W/ft2 | 0.180 W/ft2 | 0.252 W/ft2 | | Street frontage for vehicle sales lots in addition to "open area" allowance | No Allowance | 7 W/linear foot | 10.3 W/linear foot | 14.4 W/linear foot |

| For SI: | 1 foot = 304.8 mm, 1 watt per square foot = 10.76 W per m2 | | --- | --- |

Table C405.5.3(3)

Individual Lighting Power Allowances for Building Exteriors

| | Lighting Zones | | | | | --- | --- | --- | --- | --- | | Zone 1 | Zone 2 | Zone 3 | Zone 4 | | | Building façade | No allowance | 0.075 W/ft2 of gross above-grade wall area | 0.113 W/ft2 of gross above-grade wall area | 0.150 W/ft2 of gross above-grade wall area | | Automated teller machines (ATM) and night depositories | 80 W per location plus 25 per additional ATM | 80 W per location plus 25 per additional ATM | 80 W per location plus 25 per additional ATM | 80 W per location plus 25 per additional ATM | | Uncovered entrances and gatehouse inspection stations at guarded facilities | 0.144 W/ft2 | 0.252 W/ft2 | 0.360 W/ft2 | 0.504 W/ft2 | | Uncovered loading areas for law enforcement, fire, ambulance and other emergency service vehicles | 0.104 W/ft2 | 0.182 W/ft2 | 0.260 W/ft2 | 0.364 W/ft2 | | Drive-up windows/doors | 53 W per drive through | 92 W per drive through | 132 W per drive through | 185 W per drive through | | Parking near 24-hour retail entrances | 80 W per main entry | 140 W per main entry | 200 W per main entry | 280 W per main entry |

History

• Statutory Authority: RCW 19.27A.020, 19.27A.025, 19.27A.160 and chapters 19.27A and 19.27 RCW. WSR 22-14-091, 23-12-101, and 23-20-021, § 51-11C-405064, filed 7/1/22, 6/7/23, and 9/25/23, effective 3/15/24. Statutory Authority: RCW 19.27A.025, 19.27A.045 and chapter 19.27 RCW. WSR 20-21-080, § 51-11C-405064, filed 10/19/20, effective 2/1/21. Statutory Authority: RCW 19.27A.020, 19.27A.025, 19.27A.160 and chapter 19.27 RCW. WSR 19-24-040, § 51-11C-405064, filed 11/26/19, effective 7/1/20. Statutory Authority: RCW 19.27A.025, 19.27A.160, and 19.27.074. WSR 16-03-072, § 51-11C-405064, filed 1/19/16, effective 7/1/16. Statutory Authority: RCW 19.27A.020, 19.27A.025 and chapters 19.27 and 34.05 RCW. WSR 13-04-056, § 51-11C-405064, filed 2/1/13, effective 7/1/13.

Wash. Admin. Code § 51-11C-40507 Sections C405.6 and C405.7—Electrical energy consumption.

C405.6 Electrical transformers. Low-voltage dry-type distribution electric transformers shall meet the minimum efficiency requirements of Table C405.6 as tested and rated in accordance with the test procedure listed in DOE 10 C.F.R. 431. The efficiency shall be verified through certification under an approved certification program or, where no certification program exists, the equipment efficiency ratings shall be supported by data furnished by the transformer manufacturer.

| EXCEPTION: | The following transformers are exempt: | | --- | --- | | | 1. Transformers that meet the Energy Policy Act of 2005 exclusions based on the DOE 10 C.F.R. 431 definition of special purpose applications. | | | 2. Transformers that meet the Energy Policy Act of 2005 exclusions that are not to be used in general purpose applications based on information provided in DOE 10 C.F.R. 431. | | | 3. Transformers that meet the Energy Policy Act of 2005 exclusions with multiple voltage taps where the highest tap is not less than 20 percent more than the lowest tap. | | | 4. Drive transformers. | | | 5. Rectifier transformers. | | | 6. Auto-transformers. | | | 7. Uninterruptible power system transformers. | | | 8. Impedance transformers. | | | 9. Regulating transformers. | | | 10. Sealed and nonventilating transformers. | | | 11. Machine tool transformer. | | | 12. Welding transformer. | | | 13. Grounding transformer. | | | 14. Testing transformer. |

Table C405.6

Minimum Nominal Efficiency Levels For 10 C.F.R. 431 Low Voltage Dry-Type Distribution Transformers

| Single Phase Transformers | Three Phase Transformers | | | | --- | --- | --- | --- | | kVAa | Efficiency (%)b | kVAa | Efficiency (%)b | | 15 | 97.70 | 15 | 97.89 | | 25 | 98.00 | 30 | 98.23 | | 37.5 | 98.20 | 45 | 98.40 | | 50 | 98.30 | 75 | 98.60 | | 75 | 98.50 | 112.5 | 98.74 | | 100 | 98.60 | 150 | 98.83 | | 167 | 98.70 | 225 | 98.94 | | 250 | 98.80 | 300 | 99.02 | | 333 | 98.90 | 500 | 99.14 | | | | 750 | 99.23 | | | | 1000 | 99.28 |

| a | kiloVolt-Amp rating. | | --- | --- | | b | Nominal efficiencies shall be established in accordance with the DOE 10 C.F.R. 431 test procedure for low voltage dry-type transformers. |

C405.7 Dwelling unit electrical energy consumption. Each dwelling unit located in a Group R-2 building shall have a separate electrical meter. A utility tenant meter meets this requirement. See Section C409 for additional requirements for energy metering and energy consumption management.

| EXCEPTION: | Dwelling units in other than Group R-2 multi-family and live/work units are not required to provide a separate electrical metering at each dwelling unit where electrical usage is metered separately for each of the following building end uses: | | --- | --- | | | 1. Dwelling units. | | | 2. Sleeping units. | | | 3. Commercial kitchens. | | | 4. Central laundries. |

C405.7.1 Electric receptacles at dwelling unit gas appliances. Where dwelling unit appliances are served by natural gas, an electrical receptacle or junction box and circuit shall be provided at each gas appliance with sufficient capacity to serve a future electric appliance in the same location. The receptacles and circuits shall be included in the electrical service load calculation and shall meet the requirements of items 1 through 3 below. The receptacle or junction box for each gas appliance shall be located within 12 inches of the appliance and without obstructions between the appliance and the outlet. An electric receptacle is not required for a decorative gas fireplace.

1. Each gas range, cooktop, or oven, or combination appliance, location shall be served by a dedicated 240/208-volt, 40-amp receptacle connected to the dwelling unit electric panel with a 3-conductor branch circuit complying with 210.19(A)(3) of the NEC as adopted by Washington state and a minimum included load of 9600 VA for 240-volt systems or 8000 VA for 208-volt systems.

2. Each gas clothes dryer location shall be served by a dedicated 240/208-volt, 30-amp receptacle connected to the dwelling unit electric panel with a 3-conductor branch circuit and a minimum included load of 5000 VA.

3. The location of each gas domestic water heater installed within a dwelling unit shall be served by a dedicated 240/208-volt, 30-amp junction box connected to the dwelling unit electrical panel with a 3-conductor branch circuit and a minimum included load of 4500 VA.

History

• Statutory Authority: RCW 19.27A.020, 19.27A.025, 19.27A.160 and chapters 19.27A and 19.27 RCW. WSR 22-14-091, 23-12-101, and 23-20-021, § 51-11C-40507, filed 7/1/22, 6/7/23, and 9/25/23, effective 3/15/24. Statutory Authority: RCW 19.27A.020, 19.27A.025, 19.27A.160 and chapter 19.27 RCW. WSR 19-24-040, § 51-11C-40507, filed 11/26/19, effective 7/1/20. Statutory Authority: RCW 19.27A.025, 19.27A.045, 19.27A.160, and 19.27.074. WSR 17-10-062, § 51-11C-40507, filed 5/2/17, effective 6/2/17
• WSR 16-13-089, § 51-11C-40507, filed 6/15/16, effective 7/16/16. Statutory Authority: RCW 19.27A.025, 19.27A.160, and 19.27.074. WSR 16-03-072, § 51-11C-40507, filed 1/19/16, effective 7/1/16. Statutory Authority: RCW 19.27A.020, 19.27A.025 and chapters 19.27 and 34.05 RCW. WSR 13-04-056, § 51-11C-40507, filed 2/1/13, effective 7/1/13.

Wash. Admin. Code § 51-11C-40508 Section C405.8—Electric motors.

C405.8 Electric motor efficiency. All electric motors, fractional or otherwise, shall meet the minimum efficiency requirements of Tables C405.8(1) through C405.8(4) when tested and rated in accordance with DOE 10 C.F.R. 431. The efficiency shall be verified through certification under an approved certification program or, where no certification program exists, the equipment efficiency ratings shall be supported by data furnished by the motor manufacturer.

| EXCEPTION: | The standards in this section shall not apply to the following exempt electric motors. | | --- | --- | | | 1. Air-over electric motors. | | | 2. Components sets of an electric motor. | | | 3. Liquid-cooled electric motors. | | | 4. Submersible electric motors. | | | 5. Inverter-only electric motors. |

Fractional hp fan motors that are 1/12 hp or greater and less than 1 hp (based on output power) which are not covered by Tables C405.8(3) and C405.8(4) shall be electronically commutated motors or shall have a minimum motor efficiency of 70 percent when rated in accordance with DOE 10 C.F.R. 431. These motors shall also have the means to adjust motor speed for either balancing or remote control. Belt-driven fans may use sheave adjustments for airflow balancing in lieu of a varying motor speed.

| EXCEPTIONS: | 1. Motors that are an integral part of specialized process equipment. | | --- | --- | | | 2. Where the motor is integral to a listed piece of equipment for which no complying motor has been approved. | | | 3. Motors used as a component of the equipment meeting the minimum efficiency requirements of Section C403.3.2 and Tables C403.3.2(1) through C403.3.2(16) provided that the motor input is included when determining the equipment efficiency. | | | 4. Motors in the airstream within fan-coils and terminal units that operate only when providing heating to the space served. | | | 5. Fan motors that are not covered by Tables C405.8(1) through C405.8(4) and are used to power heat recovery ventilators, energy recovery ventilators, or local exhaust fans in Group R subject to the efficacy requirements of Section C403.8.4. | | | 6. Domestic clothes dryer booster fans, range hood exhaust fans, and domestic range booster fans that operate intermittently. | | | 7. Radon and contaminated soil exhaust fans. | | | 8. Group R heat recovery ventilator and energy recovery ventilator fans that are less than 400 cfm. |

Table C405.8(1)

Minimum Nominal Full-load Efficiency for NEMA Design A, NEMA Design B and IEC Design N Motors (Excluding Fire Pump) Electric Motors at 60 Hza,b

| Motor horsepower (Standard kilowatt equivalent) | Nominal full-load efficiency (%) as of June 1, 2016 | | | | | | | | | --- | --- | --- | --- | --- | --- | --- | --- | --- | | 2 pole | 4 pole | 6 pole | 8 pole | | | | | | | Enclosed | Open | Enclosed | Open | Enclosed | Open | Enclosed | Open | | | 1 (0.75) | 77.0 | 77.0 | 85.5 | 85.5 | 82.5 | 82.5 | 75.5 | 75.5 | | 1.5 (1.1) | 84.0 | 84.0 | 86.5 | 86.5 | 87.5 | 86.5 | 78.5 | 77.5 | | 2 (1.5) | 85.5 | 85.5 | 86.5 | 86.5 | 88.5 | 87.5 | 84.0 | 86.5 | | 3 (2.2) | 86.5 | 85.5 | 89.5 | 89.5 | 89.5 | 88.5 | 85.5 | 87.5 | | 5 (3.7) | 88.5 | 86.5 | 89.5 | 89.5 | 89.5 | 89.5 | 86.5 | 88.5 | | 7.5 (5.5) | 89.5 | 88.5 | 91.7 | 91.0 | 91.0 | 90.2 | 86.5 | 89.5 | | 10 (7.5) | 90.2 | 89.5 | 91.7 | 91.7 | 91.0 | 91.7 | 89.5 | 90.2 | | 15 (11) | 91.0 | 90.2 | 92.4 | 93.0 | 91.7 | 91.7 | 89.5 | 90.2 | | 20 (15) | 91.0 | 91.0 | 93.0 | 93.0 | 91.7 | 92.4 | 90.2 | 91.0 | | 25 (18.5) | 91.7 | 91.7 | 93.6 | 93.6 | 93.0 | 93.0 | 90.2 | 91.0 | | 30 (22) | 91.7 | 91.7 | 93.6 | 94.1 | 93.0 | 93.6 | 91.7 | 91.7 | | 40 (30) | 92.4 | 92.4 | 94.1 | 94.1 | 94.1 | 94.1 | 91.7 | 91.7 | | 50 (37) | 93.0 | 93.0 | 94.5 | 94.5 | 94.1 | 94.1 | 92.4 | 92.4 | | 60 (45) | 93.6 | 93.6 | 95.0 | 95.0 | 94.5 | 94.5 | 92.4 | 93.0 | | 75 (55) | 93.6 | 93.6 | 95.4 | 95.0 | 94.5 | 94.5 | 93.6 | 94.1 | | 100 (75) | 94.1 | 93.6 | 95.4 | 95.4 | 95.0 | 95.0 | 93.6 | 94.1 | | 125 (90) | 95.0 | 94.1 | 95.4 | 95.4 | 95.0 | 95.0 | 94.1 | 94.1 | | 150 (110) | 95.0 | 94.1 | 95.8 | 95.8 | 95.8 | 95.4 | 94.1 | 94.1 | | 200 (150) | 95.4 | 95.0 | 96.2 | 95.8 | 95.8 | 95.4 | 94.5 | 94.1 | | 250 (186) | 95.8 | 95.0 | 96.2 | 95.8 | 95.8 | 95.8 | 95.0 | 95.0 | | 300 (224) | 95.8 | 95.4 | 96.2 | 95.8 | 95.8 | 95.8 | | | | 350 (261) | 95.8 | 95.4 | 96.2 | 95.8 | 95.8 | 95.8 | | | | 400 (298) | 95.8 | 95.8 | 96.2 | 95.8 | | | | | | 450 (336) | 95.8 | 96.2 | 96.2 | 96.2 | | | | | | 500 (373) | 95.8 | 96.2 | 96.2 | 96.2 | | | | |

| a | Nominal efficiencies shall be established in accordance with DOE 10 C.F.R. 431. | | --- | --- | | b | For purposes of determining the required minimum nominal full-load efficiency of an electric motor that has a horsepower or kilowatt rating between two horsepower or two kilowatt ratings listed in this table, each such motor shall be deemed to have a listed horsepower or kilowatt rating, determined as follows: | | | 1. A horsepower at or above the midpoint between the two consecutive horsepowers shall be rounded up to the higher of the two horsepowers. | | | 2. A horsepower below the midpoint between the two consecutive horsepowers shall be rounded down to the lower of the two horsepowers. | | | 3. A kilowatt rating shall be directly converted from kilowatts to horsepower using the formula 1 kW = (1/0.746) horsepower. The conversion should be calculated to three significant decimal places, and the resulting horsepower shall be rounded in accordance with 1 or 2, whichever applies. |

Table C405.8(2)

Minimum Nominal Full-load Efficiency for NEMA Design C and IEC Design H Motors at 60 Hza,b

| Motor horsepower (Standard kilowatt equivalent) | Nominal full-load efficiency (%) as of June 1, 2016 | | | | | | | --- | --- | --- | --- | --- | --- | --- | | 4 pole | 6 pole | 8 pole | | | | | | Enclosed | Open | Enclosed | Open | Enclosed | Open | | | 1 (0.75) | 85.5 | 85.5 | 82.5 | 82.5 | 75.5 | 75.5 | | 1.5 (1.1) | 86.5 | 86.5 | 87.5 | 86.5 | 78.5 | 77.5 | | 2 (1.5) | 86.5 | 86.5 | 88.5 | 87.5 | 84.0 | 86.5 | | 3 (2.2) | 89.5 | 89.5 | 89.5 | 88.5 | 85.5 | 87.5 | | 5 (3.7) | 89.5 | 89.5 | 89.5 | 89.5 | 86.5 | 88.5 | | 7.5 (5.5) | 91.7 | 91.0 | 91.0 | 90.2 | 86.5 | 89.5 | | 10 (7.5) | 91.7 | 91.7 | 91.0 | 91.7 | 89.5 | 90.2 | | 15 (11) | 92.4 | 93.0 | 91.7 | 91.7 | 89.5 | 90.2 | | 20 (15) | 93.0 | 93.0 | 91.7 | 92.4 | 90.2 | 91.0 | | 25 (18.5) | 93.6 | 93.6 | 93.0 | 93.0 | 90.2 | 91.0 | | 30 (22) | 93.6 | 94.1 | 93.0 | 93.6 | 91.7 | 91.7 | | 40 (30) | 94.1 | 94.1 | 94.1 | 94.1 | 91.7 | 91.7 | | 50 (37) | 94.5 | 94.5 | 94.1 | 94.1 | 92.4 | 92.4 | | 60 (45) | 95.0 | 95.0 | 94.5 | 94.5 | 92.4 | 93.0 | | 75 (55) | 95.4 | 95.0 | 94.5 | 94.5 | 93.6 | 94.1 | | 100 (75) | 95.4 | 95.4 | 95.0 | 95.0 | 93.6 | 94.1 | | 125 (90) | 95.4 | 95.4 | 95.0 | 95.0 | 94.1 | 94.1 | | 150 (110) | 95.8 | 95.8 | 95.8 | 95.4 | 94.1 | 94.1 | | 200 (150) | 96.2 | 95.8 | 95.8 | 95.4 | 94.5 | 94.1 |

| NR - No requirement. | | | --- | --- | | a | Nominal efficiencies shall be established in accordance with DOE 10 C.F.R. 431. | | b | For purposes of determining the required minimum nominal full-load efficiency of an electric motor that has a horsepower or kilowatt rating between two horsepower or two kilowatt ratings listed in this table, each such motor shall be deemed to have a listed horsepower or kilowatt rating, determined as follows: | | | 1. A horsepower at or above the midpoint between the two consecutive horsepowers shall be rounded up to the higher of the two horsepowers. | | | 2. A horsepower below the midpoint between the two consecutive horsepowers shall be rounded down to the lower of the two horsepowers. | | | 3. A kilowatt rating shall be directly converted from kilowatts to horsepower using the formula 1 kW = (1/0.746) horsepower. The conversion should be calculated to three significant decimal places, and the resulting horsepower shall be rounded in accordance with 1 or 2, whichever applies. |

Table C405.8(3)

Minimum Average Full Load Efficiency for Polyphase Small Electric Motorsa

| OPEN MOTORS | | | | | --- | --- | --- | --- | | NUMBER OF POLES ==˃ | 2 | 4 | 6 | | SYNCHRONOUS SPEED (RPM) ==˃ | 3600 | 1800 | 1200 | | MOTOR HORSEPOWER ▼ | | | | | 0.25 | 65.6 | 69.5 | 67.5 | | 0.33 | 69.5 | 73.4 | 71.4 | | 0.50 | 73.4 | 78.2 | 75.3 | | 0.75 | 76.8 | 81.1 | 81.7 | | 1 | 77.0 | 83.5 | 82.5 | | 1.5 | 84.0 | 86.5 | 83.8 | | 2 | 85.5 | 86.5 | N/A | | 3 | 85.5 | 86.9 | N/A | | a Average full load efficiencies shall be established in accordance with 10 C.F.R. 431. | | | |

Table C405.8(4)

Minimum Average Full Load Efficiency For Capacitor-start Capacitor-run and Capacitor-start Induction-run Small Electric Motorsa

| OPEN MOTORS | | | | | --- | --- | --- | --- | | NUMBER OF POLES ==˃ | 2 | 4 | 6 | | SYNCHRONOUS SPEED (RPM) ==˃ | 3600 | 1800 | 1200 | | MOTOR HORSEPOWER ▼ | | | | | 0.25 | 66.6 | 68.5 | 62.2 | | 0.33 | 70.5 | 72.4 | 66.6 | | 0.50 | 72.4 | 76.2 | 76.2 | | 0.75 | 76.2 | 81.8 | 80.2 | | 1 | 80.4 | 82.6 | 81.1 | | 1.5 | 81.5 | 83.8 | N/A | | 2 | 82.9 | 84.5 | N/A | | 3 | 84.1 | N/A | N/A | | a Average full load efficiencies shall be established in accordance with 10 C.F.R. 431. | | | |

History

• Statutory Authority: RCW 19.27A.020, 19.27A.025, 19.27A.160 and chapters 19.27A and 19.27 RCW. WSR 22-14-091, 23-12-101, and 23-20-021, § 51-11C-40508, filed 7/1/22, 6/7/23, and 9/25/23, effective 3/15/24. Statutory Authority: RCW 19.27A.025, 19.27A.045 and chapter 19.27 RCW. WSR 20-21-080, § 51-11C-40508, filed 10/19/20, effective 2/1/21. Statutory Authority: RCW 19.27A.020, 19.27A.025, 19.27A.160 and chapter 19.27 RCW. WSR 19-24-040, § 51-11C-40508, filed 11/26/19, effective 7/1/20. Statutory Authority: RCW 19.27A.025, 19.27A.160, and 19.27.074. WSR 16-03-072, § 51-11C-40508, filed 1/19/16, effective 7/1/16. Statutory Authority: RCW 19.27A.020, 19.27A.025 and chapters 19.27 and 34.05 RCW. WSR 13-04-056, § 51-11C-40508, filed 2/1/13, effective 7/1/13.

Wash. Admin. Code § 51-11C-40509 Section C405.9—Vertical and horizontal transportation systems.

C405.9 Vertical and horizontal transportation systems and equipment. Vertical and horizontal transportation systems and equipment shall comply with this section.

C405.9.1 Elevator cabs. For the luminaires in each elevator cab, not including signals and displays, the sum of the lumens divided by the sum of the watts shall be no less than 35 lumens per watt. Ventilation fans in elevators that do not have their own air conditioning system shall not consume more than 0.33 watts/cfm at the maximum rated speed of the fan. Controls shall be provided that will deenergize ventilation fans and lighting systems when the elevator is stopped, unoccupied and with its doors closed for over 15 minutes.

C405.9.2 Escalators and moving walks. Escalators and moving walks shall comply with ASME A17.1/CSA B44 and shall have automatic controls that reduce speed as permitted in accordance with ASME A17.1/CSA B44 and applicable local code when not conveying passengers.

| EXCEPTION: | A variable voltage drive system that reduces operating voltage in response to light loading conditions is allowed to be provided in lieu of the variable speed function. | | --- | --- |

C405.9.2.1Energy recovery. Escalators shall be designed to recover electrical energy when resisting overspeed in the down direction.

History

• Statutory Authority: RCW 19.27A.045 and chapter 19.27A RCW. WSR 24-16-145, § 51-11C-40509, filed 8/7/24, effective 9/7/24. Statutory Authority: RCW 19.27A.020, 19.27A.025, 19.27A.160 and chapters 19.27A and 19.27 RCW. WSR 22-14-091, 23-12-101, and 23-20-021, § 51-11C-40509, filed 7/1/22, 6/7/23, and 9/25/23, effective 3/15/24. Statutory Authority: RCW 19.27A.020, 19.27A.025, 19.27A.160 and chapter 19.27 RCW. WSR 19-24-040, § 51-11C-40509, filed 11/26/19, effective 7/1/20. Statutory Authority: RCW 19.27A.025, 19.27A.160, and 19.27.074. WSR 16-03-072, § 51-11C-40509, filed 1/19/16, effective 7/1/16. Statutory Authority: RCW 19.27A.020, 19.27A.025 and chapters 19.27 and 34.05 RCW. WSR 13-04-056, § 51-11C-40509, filed 2/1/13, effective 7/1/13.

Wash. Admin. Code § 51-11C-40510 Section C405.10—Controlled receptacles.

C405.10 Automatic receptacle control. The following shall have automatic receptacle control complying with Section C405.10.1:

1. At least 50 percent of all 125V, 15- and 20-amp receptacles installed in enclosed offices, conference rooms, rooms used primarily for copy or print functions, breakrooms, classrooms and individual workstations, including those installed in modular partitions and module office workstation systems.

2. At least 50 percent of branch circuit feeders installed for modular furniture not shown on the construction documents.

C405.10.1 Automatic receptacle control function. Automatic receptacle controls shall comply with the following:

1. Either split controlled receptacles shall be provided with the top receptacle controlled, or a controlled receptacle shall be located within 12 inches (304.8 mm) of each uncontrolled receptacle.

2. One of the following methods shall be used to provide control:

2.1. A scheduled basis using a time-of-day operated control device that turns receptacle power off at specific programmed times and can be programmed separately for each day of the week. The control device shall be configured to provide an independent schedule for each portion of the building of not more than 5,000 square feet (464.5 m2) and not more than one floor. The occupant shall be able to manually override an area for not more than 2 hours. Any individual override switch shall control the receptacles of not more than 5,000 feet (1524 m).

2.2. An occupant sensor control that shall turn off receptacles within 20 minutes of all occupants leaving a space.

2.3. An automated signal from another control or alarm system that shall turn off receptacles within 20 minutes after determining that the local area is unoccupied.

3. All controlled receptacles shall be permanently marked in accordance with NFPA 70 and be uniformly distributed throughout the space.

4. Plug-in devices shall not comply.

| EXCEPTION: | Automatic receptacle controls are not required for the following: | | --- | --- | | | 1. Receptacles specifically designated for equipment requiring continuous operation (24 hours per day, 365 days per year). | | | 2. Spaces where an automatic control would endanger the safety or security of the room or building occupants. | | | 3. Within a single modular office workstation, noncontrolled receptacles are permitted to be located more than 12 inches (304.8 mm), but not more than 72 inches (1828 mm) from the controlled receptacles serving that workstation. |

History

• Statutory Authority: RCW 19.27A.020, 19.27A.025, 19.27A.160 and chapters 19.27A and 19.27 RCW. WSR 22-14-091, 23-12-101, and 23-20-021, § 51-11C-40510, filed 7/1/22, 6/7/23, and 9/25/23, effective 3/15/24. Statutory Authority: RCW 19.27A.020, 19.27A.025, 19.27A.160 and chapter 19.27 RCW. WSR 19-24-040, § 51-11C-40510, filed 11/26/19, effective 7/1/20. Statutory Authority: RCW 19.27A.025, 19.27A.160, and 19.27.074. WSR 16-03-072, § 51-11C-40510, filed 1/19/16, effective 7/1/16. Statutory Authority: RCW 19.27A.020, 19.27A.025 and chapters 19.27 and 34.05 RCW. WSR 13-04-056, § 51-11C-40510, filed 2/1/13, effective 7/1/13.

Wash. Admin. Code § 51-11C-40511 Section C405.11—Voltage drop.

C405.11 Voltage drop. The total voltage drop across the combination of customer-owned service conductors, feeder conductors and branch circuit conductors shall not exceed five percent.

History

• Statutory Authority: RCW 19.27A.020, 19.27A.025, 19.27A.160 and chapters 19.27A and 19.27 RCW. WSR 22-14-091, 23-12-101, and 23-20-021, § 51-11C-40511, filed 7/1/22, 6/7/23, and 9/25/23, effective 3/15/24. Statutory Authority: RCW 19.27A.025, 19.27A.045 and chapter 19.27 RCW. WSR 20-21-080, § 51-11C-40511, filed 10/19/20, effective 2/1/21. Statutory Authority: RCW 19.27A.020, 19.27A.025, 19.27A.160 and chapter 19.27 RCW. WSR 19-24-040, § 51-11C-40511, filed 11/26/19, effective 7/1/20. Statutory Authority: RCW 19.27A.025, 19.27A.045, 19.27A.160, and 19.27.074. WSR 16-24-070, § 51-11C-40511, filed 12/6/16, effective 5/1/17. Statutory Authority: RCW 19.27A.025, 19.27A.160, and 19.27.074. WSR 16-03-072, § 51-11C-40511, filed 1/19/16, effective 7/1/16. Statutory Authority: RCW 19.27A.020, 19.27A.025 and chapters 19.27 and 34.05 RCW. WSR 13-04-056, § 51-11C-40511, filed 2/1/13, effective 7/1/13.

Wash. Admin. Code § 51-11C-40512 Section C405.12—Alternating current-output uninterruptible power supplies (AC-output UPS).

AC-output UPS systems serving a computer room shall meet or exceed the calculation and testing requirements identified in ENERGY STAR Program Requirements for Uninterruptible Power Supplies (UPSs) – Eligibility Criteria Version 2.0.

| EXCEPTION: | AC-output UPC that utilizes standardized NEMA-1-15P or NEMA 5-15P input plug, as specified in ANSI/NEMA WD 6. | | --- | --- |

History

• Statutory Authority: RCW 19.27A.020, 19.27A.025, 19.27A.160 and chapters 19.27A and 19.27 RCW. WSR 22-14-091, 23-12-101, and 23-20-021, § 51-11C-40512, filed 7/1/22, 6/7/23, and 9/25/23, effective 3/15/24. Statutory Authority: RCW 19.27A.020, 19.27A.025, 19.27A.160 and chapter 19.27 RCW. WSR 19-24-040, § 51-11C-40512, filed 11/26/19, effective 7/1/20. Statutory Authority: RCW 19.27A.025, 19.27A.160, and 19.27.074. WSR 16-03-072, § 51-11C-40512, filed 1/19/16, effective 7/1/16. Statutory Authority: RCW 19.27A.020, 19.27A.025 and chapters 19.27 and 34.05 RCW. WSR 13-04-056, § 51-11C-40512, filed 2/1/13, effective 7/1/13.

Wash. Admin. Code § 51-11C-40513 Section C405.13—Electrical commissioning.

C405.13 Commissioning. Controlled receptacles and lighting systems shall be commissioned in accordance with Section C408.

History

• Statutory Authority: RCW 19.27A.020, 19.27A.025, 19.27A.160 and chapters 19.27A and 19.27 RCW. WSR 22-14-091, 23-12-101, and 23-20-021, § 51-11C-40513, filed 7/1/22, 6/7/23, and 9/25/23, effective 3/15/24. Statutory Authority: RCW 19.27A.020, 19.27A.025, 19.27A.160 and chapter 19.27 RCW. WSR 19-24-040, § 51-11C-40513, filed 11/26/19, effective 7/1/20. Statutory Authority: RCW 19.27A.020, 19.27A.025 and chapters 19.27 and 34.05 RCW. WSR 13-04-056, § 51-11C-40513, filed 2/1/13, effective 7/1/13.

Wash. Admin. Code § 51-11C-40600 Section C406—Efficiency and load management measures.

C406.1 Additional energy efficiency and load management measures credit requirements. The project as defined in the building permit shall meet the following requirements as applicable:

1. New buildings, changes in space conditioning category, change of occupancy group, and building additions in accordance with Chapter 5 shall comply with sufficient measures from Section C406.2 so as to achieve the minimum number of required efficiency credits shown in Table C406.1.

2. New buildings greater than 5000 gross square feet of floor area shall comply with sufficient measures from Section C406.3 so as to achieve the minimum number of required load management credits shown in Table C406.1.

3. Tenant spaces shall comply in accordance with Section C406.1.1.

4. Projects using discrete area credit weighting shall comply in accordance with Section C406.1.2.

| EXCEPTIONS: | 1. Low energy spaces in accordance with Section C402.1.1.1, equipment buildings in accordance with Section C402.1.2, unconditioned spaces, open parking garages, and enclosed parking garages that comply with sufficient measures from Table C406.2(1) to achieve a minimum of 50 percent of the efficiency credits required for new construction. Such projects shall be exempt from the load management requirements in Table C406.1. | | --- | --- | | | 2. Building additions that have less than 1,000 square feet of conditioned floor area that comply with sufficient measures from Table C406.2(1) to achieve a minimum of 50 percent of the efficiency credits required for additions. | | | 3. Warehouses are exempt from the load management credit requirements in Table C406.1. |

Table C406.1

Energy Measure Credit Requirements

| Required Credits for Projects | Section | Occupancy Group | | | | | | | --- | --- | --- | --- | --- | --- | --- | --- | | Group R-1 | Group R-2 | Group B | Group E | Group M | All Other | | | | New building energy efficiency credit requirement | C406.2 | 54 | 41 | 42 | 48 | 74 | 49 | | Building additions energy efficiency credit requirement | C406.2 | 27 | 20 | 21 | 23 | 36 | 21 | | New building load management credit requirement | C406.3 | 12 | 15 | 27 | 15 | 13 | 26 |

C406.1.1 Tenant spaces. An initial tenant improvement shall comply with sufficient measures from Table C406.2(1) to achieve a minimum of efficiency credits required in Table C406.1 and are not required to achieve any load management credits. In projects with multiple tenant spaces, each tenant space is permitted to apply for different measures provided the weighted average of all areas in the project comply with the overall efficiency credit requirement in Table C406.1. Whole building or addition energy credits shall be allocated to tenant spaces in accordance with Sections C406.1.1.1 and C406.1.1.2.

| EXCEPTIONS: | 1. An initial tenant improvement where the core and shell building complied via Section C407 in 2018 or later edition of the Washington State Energy Code. | | --- | --- | | | 2. Previously occupied tenant spaces in existing buildings that complies with this code in accordance with Section C501. |

C406.1.1.1 Applicable envelope, renewable and elevator energy credits. Where an entire building or building addition complies with Section C406.2.5, C406.2.12, or C406.2.18, under an initial tenant improvement permit, tenant spaces within the building qualify for the number of credits assigned to the occupancy group of the tenant space in accordance with Table C406.2(1). Where prior energy credits were achieved under the 2018 Washington State Energy Code, they shall be multiplied by 6 for applicability to this code.

C406.1.1.2 Applicable HVAC and service water heating credits. Where HVAC and service water heating systems and services are installed and comply with Section C406.2.2, C406.2.8, C406.2.9, or C406.2.10 under an initial tenant improvement permit, those systems and services shall be considered a part of the tenant space. Tenant spaces qualify for the credits assigned to the occupancy group of the tenant space in accordance with Table C406.2(1) if the tenant space includes the distribution system and equipment that the central HVAC systems or service water heating systems were designed to support.

C406.1.2 Discrete area-weighted project compliance. Discrete building areas are permitted to select different packages of measures provided that the whole project complies with both the energy and load management credit requirements. Compliance shall be determined as follows:

1. Required project credits shall be prorated on an area-weighted basis for each occupancy group by multiplying the occupancy group floor area by the number of credits required, and then dividing this value by the total area of all the occupancy groups combined. Where one occupancy group is less than 10 percent of the floor area of the project, use the primary occupancy group for those credits.

2. Occupancies are permitted to be subdivided into discrete areas, with required and achieved credits for each area prorated on an area-weighted basis as required for the occupancy group.

3. Where envelope or lighting power credits in Section C406.2.3.1, C406.2.3.2, or C406.2.3.12 are applied, the lighting power or envelope UA percentage reduction shall be calculated for the project as a whole to determine achieved credits.

4. Determine total project credits achieved by area-weighting the achieved credits by occupancy group in the same manner as for required project credits.

5. A project complies when the achieved number of area-weighted energy and load management credits are equal to or greater than the required area-weighted number of credits.

History

• Statutory Authority: RCW 19.27A.045 and chapter 19.27A RCW. WSR 24-16-145, § 51-11C-40600, filed 8/7/24, effective 9/7/24. Statutory Authority: RCW 19.27A.020, 19.27A.025, 19.27A.160, chapters 19.27A and 19.27 RCW. WSR 24-03-085, § 51-11C-40600, filed 1/16/24, effective 3/15/24
• WSR 22-14-091, 23-12-101, and 23-20-021, § 51-11C-40600, filed 7/1/22, 6/7/23, and 9/25/23, effective 3/15/24. Statutory Authority: RCW 19.27A.025, 19.27A.045 and chapter 19.27 RCW. WSR 20-21-080, § 51-11C-40600, filed 10/19/20, effective 2/1/21. Statutory Authority: RCW 19.27A.020, 19.27A.025, 19.27A.160 and chapter 19.27 RCW. WSR 19-24-040, § 51-11C-40600, filed 11/26/19, effective 7/1/20. Statutory Authority: RCW 19.27A.025, 19.27A.160, and 19.27.074. WSR 16-03-072, § 51-11C-40600, filed 1/19/16, effective 7/1/16. Statutory Authority: RCW 19.27A.020, 19.27A.025 and chapters 19.27 and 34.05 RCW. WSR 13-04-056, § 51-11C-40600, filed 2/1/13, effective 7/1/13.

Wash. Admin. Code § 51-11C-40602 Reserved.

History

• Statutory Authority: RCW 19.27A.020, 19.27A.025, 19.27A.160 and chapters 19.27A and 19.27 RCW. WSR 22-14-091, 23-12-101, and 23-20-021, § 51-11C-40602, filed 7/1/22, 6/7/23, and 9/25/23, effective 3/15/24. Statutory Authority: RCW 19.27A.025, 19.27A.045 and chapter 19.27 RCW. WSR 20-21-080, § 51-11C-40602, filed 10/19/20, effective 2/1/21. Statutory Authority: RCW 19.27A.020, 19.27A.025, 19.27A.160 and chapter 19.27 RCW. WSR 19-24-040, § 51-11C-40602, filed 11/26/19, effective 7/1/20. Statutory Authority: RCW 19.27A.025, 19.27A.045, 19.27A.160, and 19.27.074. WSR 16-13-089, § 51-11C-40602, filed 6/15/16, effective 7/16/16. Statutory Authority: RCW 19.27A.025, 19.27A.160, and 19.27.074. WSR 16-03-072, § 51-11C-40602, filed 1/19/16, effective 7/1/16.

Wash. Admin. Code § 51-11C-40603 Reserved.

History

• Statutory Authority: RCW 19.27A.020, 19.27A.025, 19.27A.160 and chapters 19.27A and 19.27 RCW. WSR 22-14-091, 23-12-101, and 23-20-021, § 51-11C-40603, filed 7/1/22, 6/7/23, and 9/25/23, effective 3/15/24. Statutory Authority: RCW 19.27A.025, 19.27A.045 and chapter 19.27 RCW. WSR 20-21-080, § 51-11C-40603, filed 10/19/20, effective 2/1/21. Statutory Authority: RCW 19.27A.020, 19.27A.025, 19.27A.160 and chapter 19.27 RCW. WSR 19-24-040, § 51-11C-40603, filed 11/26/19, effective 7/1/20. Statutory Authority: RCW 19.27A.025, 19.27A.160, and 19.27.074. WSR 16-03-072, § 51-11C-40603, filed 1/19/16, effective 7/1/16.

Wash. Admin. Code § 51-11C-40604 Reserved.

History

• Statutory Authority: RCW 19.27A.020, 19.27A.025, 19.27A.160 and chapters 19.27A and 19.27 RCW. WSR 22-14-091, 23-12-101, and 23-20-021, § 51-11C-40604, filed 7/1/22, 6/7/23, and 9/25/23, effective 3/15/24. Statutory Authority: RCW 19.27A.020, 19.27A.025, 19.27A.160 and chapter 19.27 RCW. WSR 19-24-040, § 51-11C-40604, filed 11/26/19, effective 7/1/20. Statutory Authority: RCW 19.27A.025, 19.27A.160, and 19.27.074. WSR 16-03-072, § 51-11C-40604, filed 1/19/16, effective 7/1/16.

Wash. Admin. Code § 51-11C-40605 Reserved.

History

• Statutory Authority: RCW 19.27A.020, 19.27A.025, 19.27A.160 and chapters 19.27A and 19.27 RCW. WSR 22-14-091, 23-12-101, and 23-20-021, § 51-11C-40605, filed 7/1/22, 6/7/23, and 9/25/23, effective 3/15/24. Statutory Authority: RCW 19.27A.020, 19.27A.025, 19.27A.160 and chapter 19.27 RCW. WSR 19-24-040, § 51-11C-40605, filed 11/26/19, effective 7/1/20. Statutory Authority: RCW 19.27A.025, 19.27A.045, 19.27A.160, and 19.27.074. WSR 16-24-070, § 51-11C-40605, filed 12/6/16, effective 5/1/17. Statutory Authority: RCW 19.27A.025, 19.27A.160, and 19.27.074. WSR 16-03-072, § 51-11C-40605, filed 1/19/16, effective 7/1/16.

Wash. Admin. Code § 51-11C-40606 Reserved.

History

• Statutory Authority: RCW 19.27A.020, 19.27A.025, 19.27A.160 and chapters 19.27A and 19.27 RCW. WSR 22-14-091, 23-12-101, and 23-20-021, § 51-11C-40606, filed 7/1/22, 6/7/23, and 9/25/23, effective 3/15/24. Statutory Authority: RCW 19.27A.025, 19.27A.045 and chapter 19.27 RCW. WSR 20-21-080, § 51-11C-40606, filed 10/19/20, effective 2/1/21. Statutory Authority: RCW 19.27A.020, 19.27A.025, 19.27A.160 and chapter 19.27 RCW. WSR 19-24-040, § 51-11C-40606, filed 11/26/19, effective 7/1/20. Statutory Authority: RCW 19.27A.025, 19.27A.160, and 19.27.074. WSR 16-03-072, § 51-11C-40606, filed 1/19/16, effective 7/1/16.

Wash. Admin. Code § 51-11C-40607 Reserved.

History

• Statutory Authority: RCW 19.27A.020, 19.27A.025, 19.27A.160 and chapters 19.27A and 19.27 RCW. WSR 22-14-091, 23-12-101, and 23-20-021, § 51-11C-40607, filed 7/1/22, 6/7/23, and 9/25/23, effective 3/15/24. Statutory Authority: RCW 19.27A.020, 19.27A.025, 19.27A.160 and chapter 19.27 RCW. WSR 19-24-040, § 51-11C-40607, filed 11/26/19, effective 7/1/20. Statutory Authority: RCW 19.27A.025, 19.27A.045, 19.27A.160, and 19.27.074. WSR 16-24-070, § 51-11C-40607, filed 12/6/16, effective 5/1/17. Statutory Authority: RCW 19.27A.025, 19.27A.160, and 19.27.074. WSR 16-03-072, § 51-11C-40607, filed 1/19/16, effective 7/1/16.

Wash. Admin. Code § 51-11C-40608 Reserved.

History

• Statutory Authority: RCW 19.27A.020, 19.27A.025, 19.27A.160 and chapters 19.27A and 19.27 RCW. WSR 22-14-091, 23-12-101, and 23-20-021, § 51-11C-40608, filed 7/1/22, 6/7/23, and 9/25/23, effective 3/15/24. Statutory Authority: RCW 19.27A.020, 19.27A.025, 19.27A.160 and chapter 19.27 RCW. WSR 19-24-040, § 51-11C-40608, filed 11/26/19, effective 7/1/20. Statutory Authority: RCW 19.27A.020, 19.27A.025 and chapters 19.27A and 19.27 RCW. WSR 19-02-089, § 51-11C-40608, filed 1/2/19, effective 7/1/19. Statutory Authority: RCW 19.27A.025, 19.27A.045, 19.27A.160, and 19.27.074. WSR 16-13-089, § 51-11C-40608, filed 6/15/16, effective 7/16/16. Statutory Authority: RCW 19.27A.025, 19.27A.160, and 19.27.074. WSR 16-03-072, § 51-11C-40608, filed 1/19/16, effective 7/1/16.

Wash. Admin. Code § 51-11C-40609 Reserved.

History

• Statutory Authority: RCW 19.27A.020, 19.27A.025, 19.27A.160 and chapters 19.27A and 19.27 RCW. WSR 22-14-091, 23-12-101, and 23-20-021, § 51-11C-40609, filed 7/1/22, 6/7/23, and 9/25/23, effective 3/15/24. Statutory Authority: RCW 19.27A.020, 19.27A.025, 19.27A.160 and chapter 19.27 RCW. WSR 19-24-040, § 51-11C-40609, filed 11/26/19, effective 7/1/20. Statutory Authority: RCW 19.27A.025, 19.27A.160, and 19.27.074. WSR 16-03-072, § 51-11C-40609, filed 1/19/16, effective 7/1/16.

Wash. Admin. Code § 51-11C-40610 Reserved.

History

• Statutory Authority: RCW 19.27A.020, 19.27A.025, 19.27A.160 and chapters 19.27A and 19.27 RCW. WSR 22-14-091, 23-12-101, and 23-20-021, § 51-11C-40610, filed 7/1/22, 6/7/23, and 9/25/23, effective 3/15/24. Statutory Authority: RCW 19.27A.020, 19.27A.025, 19.27A.160 and chapter 19.27 RCW. WSR 19-24-040, § 51-11C-40610, filed 11/26/19, effective 7/1/20.

Wash. Admin. Code § 51-11C-40611 Reserved.

History

• Statutory Authority: RCW 19.27A.020, 19.27A.025, 19.27A.160 and chapters 19.27A and 19.27 RCW. WSR 22-14-091, 23-12-101, and 23-20-021, § 51-11C-40611, filed 7/1/22, 6/7/23, and 9/25/23, effective 3/15/24. Statutory Authority: RCW 19.27A.020, 19.27A.025, 19.27A.160 and chapter 19.27 RCW. WSR 19-24-040, § 51-11C-40611, filed 11/26/19, effective 7/1/20.

Wash. Admin. Code § 51-11C-40612 Reserved.

History

• Statutory Authority: RCW 19.27A.020, 19.27A.025, 19.27A.160 and chapters 19.27A and 19.27 RCW. WSR 22-14-091, 23-12-101, and 23-20-021, § 51-11C-40612, filed 7/1/22, 6/7/23, and 9/25/23, effective 3/15/24. Statutory Authority: RCW 19.27A.020, 19.27A.025, 19.27A.160 and chapter 19.27 RCW. WSR 19-24-040, § 51-11C-40612, filed 11/26/19, effective 7/1/20.

Wash. Admin. Code § 51-11C-40620 Section C406.2—Additional energy efficiency credit measures.

C406.2 Additional energy efficiency credit measures. Each energy efficiency credit measure used to meet credit requirements for the project shall include efficiency that is greater than the energy efficiency required for the building type and configuration requirements in Sections C402 through C405. Measures installed in the project that meet the requirements in Sections C406.2.1 through C406.2.14 shall achieve the credits listed for the measure and occupancy group in Table C406.2(1) or Table C406.2(2) or where calculations required by Sections C406.2.1 through C406.2.14 create or modify the table credits, the credits achieved shall be based upon the section calculations. Projects that chose to comply with the fossil fuel pathway in Section C401.3 shall use Table C406.2(2) to achieve credits.

For mixed fuel space heating systems, the number of space heating energy efficiency credits available for measures with a prorating flag "Heat" are calculated using the following equation:

CSH = CHPSH x B/C + CFFSH x (1 – B/C)

| Where: | | | | | --- | --- | --- | --- | | | CSH | = | Blended credits for mixed fuel systems. | | | CHPSH | = | Credits available in Table C406.2(1). | | | CFFSH | = | Credits available in Table C406.2(2). | | | B | = | Installed space heating capacity in kBTU/h of space heating appliances that comply with any of the exceptions to Section C403.1.4. | | | C | = | Total installed space heating capacity in kBTU/h of all space heating appliances. |

For mixed fuel service water heating systems, the number of service water heating energy efficiency credits available for measures with a prorating flag "SWH" are calculated using the following equation:

CWH = CHPWH × B/C + CFFWH × (1 – B/C)

| Where: | | | | | --- | --- | --- | --- | | | CWH | = | Blended credits for mixed fuel systems. | | | CHPWH | = | Credits available in Table C406.2(1). | | | CFFWH | = | Credits available in Table C406.2(2). | | | B | = | Installed service water heating capacity in kBTU/h of service water heating appliances that comply with any of the exceptions to Section C404.2.1. | | | C | = | Total installed service water heating capacity in kBTU/h of all service water heating appliances. |

Table C406.2(1)

Efficiency Measure Credits

| Measure Title | Applicable Section | Prorating Flag | Occupancy Group | | | | | | | --- | --- | --- | --- | --- | --- | --- | --- | --- | | Group R-1 | Group R-2 | Group B | Group E | Group M | All Other | | | | | 1. Dwelling unit HVAC control | C406.2.1 | Heat | NA | 7 | NA | NA | NA | NA | | 2. Improved HVAC TSPRa | C406.2.2.1 | Heat | NA | 8 | 11 | 17 | 22 | NA | | 3. Improve cooling and fan efficiency | C406.2.2.2 | Heat | 2 | 2 | 3 | 4 | 3 | 2 | | 4. Improve heating efficiency | C406.2.2.3 | Heat | 2 | 3 | 3 | 10 | 16 | 7 | | 5. Improved low-carbon district energy system (10% better) | C406.2.2.4 | | 3 | 3 | 4 | 11 | 17 | 8 | | 6. Improved low-carbon district energy system (20% better)b | C406.2.2.5 | | 9 | 10 | 12 | 33 | 52 | 24 | | 7. High performance DOAS | C406.2.2.6 | Heat | 31 | 31 | 21 | 39 | 40 | 21/ (A) 40c | | 8. Fault detection & diagnostics (FDD) | C406.2.2.7 | Heat | 2 | 2 | 2 | 6 | 9 | 4 | | 9. 10% reduced lighting power | C406.2.3.1 | Heat | 7 | 4 | 18 | 16 | 20 | 15 | | 10. 20% reduced lighting powerd | C406.2.3.2 | Heat | 13 | 8 | 36 | 32 | 40 | 29 | | 11. Lamp efficacy improvement | C406.2.3.3 | Heat | 5 | 6 | NA | NA | NA | NA | | 12. Residential lighting control | C406.2.4.1 | Heat | NA | 8 | NA | NA | NA | NA | | 13. Enhanced lighting control | C406.2.4.2 | Heat | 1 | 1 | 6 | 6 | 11 | 6 | | 14. Renewable energy | C406.2.5 | | 7 | 12 | 13 | 13 | 10 | 11 | | 15. Shower drain heat recovery | C406.2.6.1 | SWH | 9 | 30 | NA | 3 | NA | NA | | 16. Service water heat recovery | C406.2.6.2 | SWH | 35 | 111 | 13 | 14 | (Grocery) 41e | NA | | 17. Heat pump water heating | C406.2.6.3 | SWH | 72 | 54 | 1 | 13 | 5 | 29f | | 18. High efficiency service water heating, gas-fired | C406.2.6.4 | SWH | NA | NA | NA | NA | NA | NA | | 19. Heat trace system | C406.2.7.1 | SWH | 6 | 13 | 4 | 1 | NA | 6 | | 20. Point of use water heater | C406.2.7.2 | SWH | NA | NA | 19 | 5 | NA | NA | | 21. Service hot water distribution right sizing | C406.2.8 | | 13 | 42 | NA | NA | NA | NA | | 22. High performance service hot water temperature maintenance system | C406.2.9 | | 6 | 13 | 4 | 1 | NA | 6 | | 23. High efficiency service hot water circulation system | C406.2.10 | | 3 | 6 | 2 | 1 | NA | 4 | | 24. Low flow residential showerheads | C406.2.11 | SWH | 3 | 3 | NA | NA | NA | NA | | 25. Enhanced envelope performanceg | C406.2.12 | Heat | 24 | 20 | 13 | 5 | 19 | 14 | | 26. Base reduced air leakageg | C406.2.13.1 | | 29 | 24 | 6 | 3 | 9 | 11 | | 27. Enhanced reduced air leakageg | C406.2.13.2 | Heat | 53 | 44 | 11 | 5 | 16 | 20 | | 28. Enhanced commercial kitchen equipment | C406.2.14 | Heat | 30h | 18h | 18h | 30h | 30h | 31h | | 29. Enhanced residential kitchen equipment | C406.2.15 | Heat | 12 | 19 | NA | NA | NA | NA | | 30. Enhanced residential laundry equipment | C406.2.16 | Heat | NA | 6 | NA | NA | NA | NA | | 31. Heat pump clothes dryers | C406.2.17 | Heat | 6 | 6 | NA | NA | NA | NA | | 32. Efficient elevator equipment | C406.2.18 | Heat | 3 | 5 | 5 | 5 | 4 | 4 |

| a | Projects using Item 2 shall not use Items 3, 4, or 7. | | --- | --- | | b | Projects using C406.2.2.5 shall not use C406.2.2.4. | | c | For C406.2.2.6, occupancy Group A achieves 40 credits while other occupancy groups within the "all other" category achieve 21 credits. | | d | Projects using C406.2.3.2 shall not use C406.2.3.1. | | e | Service water heat recovery and heat pump water heating are available in Group M only for grocery stores larger than 10,000 ft2. Large mixed retail with full grocery and butcher sections shall achieve half the credits. This credit is not available where refrigeration recovery to heat service hot water is used to meet the requirements of Section C403.9.2.3. | | f | Heat pump water heating efficiency credits are available in the "all other" category only for Group A-2. | | g | Buildings or building areas that are exempt from the thermal envelope requirements in accordance with Sections C402.1.1 and C402.1.2, do not qualify for this package. | | h | Additional energy efficiency credits, up to the maximum shown in Table C406.2(1), shall be calculated according to Section C406.2.14. |

Table C406.2(2)

Efficiency Measure Credits for use with

Fossil Fuel Compliance Path

| Measure Title | Applicable Section | Prorating Flag | Occupancy Group | | | | | | | --- | --- | --- | --- | --- | --- | --- | --- | --- | | Group R-1 | Group R-2 | Group B | Group E | Group M | All Other | | | | | 1. Dwelling unit HVAC control | C406.2.1 | Heat | NA | 8 | NA | NA | NA | NA | | 2. Improved HVAC TSPRa | C406.2.2.1 | Heat | NA | 9 | 12 | 19 | 24 | NA | | 3. Improve cooling and fan efficiency | C406.2.2.2 | Heat | 12 | 8 | 14 | 8 | 10 | 10 | | 4. Improve heating efficiency | C406.2.2.3 | Heat | 2 | 3 | 3 | 11 | 18 | 8 | | 5. Improved low-carbon district energy system (10% better) | C406.2.2.4 | | 3 | 3 | 4 | 12 | 19 | 9 | | 6. Improved low-carbon district energy system (20% better)b | C406.2.2.5 | | 10 | 11 | 13 | 36 | 57 | 26 | | 7. High performance DOAS | C406.2.2.6 | Heat | 34 | 34 | 23 | 43 | 44 | 23/ (A) 40c | | 8. Fault detection & diagnostics (FDD) | C406.2.2.7 | Heat | 2 | 2 | 2 | 6 | 9 | 4 | | 9. 10% reduced lighting power | C406.2.3.1 | Heat | 7 | 4 | 18 | 16 | 20 | 15 | | 10. 20% reduced lighting powerd | C406.2.3.2 | Heat | 13 | 8 | 36 | 32 | 40 | 29 | | 11. Lamp efficacy improvement | C406.2.3.3 | Heat | 5 | 6 | NA | NA | NA | NA | | 12. Residential lighting control | C406.2.4.1 | Heat | NA | 8 | NA | NA | NA | NA | | 13. Enhanced lighting control | C406.2.4.2 | Heat | 1 | 1 | 6 | 6 | 11 | 6 | | 14. Renewable energy | C406.2.5 | | 7 | 12 | 13 | 13 | 10 | 11 | | 15. Shower drain heat recovery | C406.2.6.1 | SWH | 10 | 33 | NA | 3 | NA | NA | | 16. Service water heat recovery | C406.2.6.2 | SWH | 35 | 111 | 13 | 14 | (Grocery) 41e | NA | | 17. Heat pump water heating | C406.2.6.3 | SWH | 135 | 163 | 17 | 33 | (Grocery) 95e | (A-2) 95f | | 18. High efficiency service water heating, gas-fired | C406.2.6.4 | SWH | 59 | 65 | 6 | 11 | 18 | 32 | | 19. Heat trace system | C406.2.7.1 | SWH | 6 | 13 | 4 | 1 | NA | 6 | | 20. Point of use water heater | C406.2.7.2 | SWH | NA | NA | 19 | 5 | NA | NA | | 21. Service hot water distribution right sizing | C406.2.8 | | 13 | 42 | NA | NA | NA | NA | | 22. High performance service hot water temperature maintenance system | C406.2.9 | | 6 | 13 | 4 | 1 | NA | 6 | | 23. High efficiency service hot water circulation system | C406.2.10 | | 3 | 6 | 2 | 1 | NA | 4 | | 24. Low flow residential showerheads | C406.2.11 | SWH | 3 | 3 | NA | NA | NA | NA | | 25. Enhanced envelope performanceg | C406.2.12 | Heat | 24 | 20 | 13 | 5 | 19 | 14 | | 26. Base reduced air leakageg | C406.2.13.1 | | 29 | 24 | 6 | 3 | 9 | 11 | | 27. Enhanced reduced air leakageg | C406.2.13.2 | Heat | 53 | 44 | 11 | 5 | 16 | 20 | | 28. Enhanced commercial kitchen equipment | C406.2.14 | Heat | 30h | 18h | 18h | 30h | 30h | 31h | | 29. Enhanced residential kitchen equipment | C406.2.15 | Heat | 12 | 19 | NA | NA | NA | NA | | 30. Enhanced residential laundry equipment | C406.2.16 | Heat | NA | 6 | NA | NA | NA | NA | | 31. Heat pump clothes dryers | C406.2.17 | Heat | 6 | 6 | NA | NA | NA | NA | | 32. Efficient elevator equipment | C406.2.18 | Heat | 3 | 5 | 5 | 5 | 4 | 4 |

| a | Projects using Item 2 shall not use Items 3, 4, or 7. | | --- | --- | | b | Projects using C406.2.2.5 shall not use C406.2.2.4. | | c | For C406.2.2.6, occupancy Group A achieves 40 credits while other occupancy groups within the "all other" category achieve 21 credits. | | d | Projects using C406.2.3.2 shall not use C406.2.3.1. | | e | Service water heat recovery and heat pump water heating are available in Group M only for grocery stores larger than 10,000 ft2. Large mixed retail with full grocery and butcher sections shall achieve half the credits. This credit is not available where refrigeration recovery to heat service hot water is used to meet the requirements of Section C403.9.2.3. | | f | Heat pump water heating efficiency credits are available in the "all other" category only for Group A-2. | | g | Buildings or building areas that are exempt from the thermal envelope requirements in accordance with Sections C402.1.1 and C402.1.2, do not qualify for this package. | | h | Additional energy efficiency credits, up to the maximum shown in Table C406.2(2), shall be calculated according to Section C406.2.14. |

History

• Statutory Authority: RCW 19.27A.045 and chapter 19.27A RCW. WSR 24-16-145, § 51-11C-40620, filed 8/7/24, effective 9/7/24. Statutory Authority: RCW 19.27A.020, 19.27A.025, 19.27A.160, chapters 19.27A and 19.27 RCW. WSR 24-03-085, § 51-11C-40620, filed 1/16/24, effective 3/15/24
• WSR 22-14-091, 23-12-101, and 23-20-021, § 51-11C-40620, filed 7/1/22, 6/7/23, and 9/25/23, effective 3/15/24.

Wash. Admin. Code § 51-11C-40621 Section C406.2.1—Dwelling unit HVAC measures.

C406.2.1 Dwelling unit HVAC controls. HVAC systems serving dwelling units or sleeping units shall be controlled with a programmable thermostat that is configured to automatically activate a setback condition of at least 5°F (3°C) for both heating and cooling. The programmable thermostat shall be configured to provide setback during occupied sleep periods. The unoccupied setback mode shall be configured to operate in conjunction with one of the following:

1. A manual main control device by each dwelling unit main entrance that initiates setback for all HVAC units in the dwelling unit and is clearly identified as "Heating/Cooling Master Setback."

2. Occupancy sensors in each room of the dwelling unit combined with a door switch to initiate setback for all HVAC units in the dwelling within 20 minutes of all spaces being vacant immediately following a door switch operation. Where separate room HVAC units are used, an individual occupancy sensor on each unit that is configured to provide setback shall meet this requirement.

3. An advanced learning thermostat that senses occupant presence and automatically creates a schedule for occupancy and provides a dynamic setback schedule based on when the spaces are generally unoccupied.

4. An automated control and sensing system that uses geographic sensing connected to the dwelling unit occupants' cell phones and initiates the setback condition when all occupants are away from the building.

History

• Statutory Authority: RCW 19.27A.020, 19.27A.025, 19.27A.160 and chapters 19.27A and 19.27 RCW. WSR 22-14-091, 23-12-101, and 23-20-021, § 51-11C-40621, filed 7/1/22, 6/7/23, and 9/25/23, effective 3/15/24.

Wash. Admin. Code § 51-11C-40622 Section C406.2.2—HVAC measures.

C406.2.2 More efficient HVAC system performance. All heating and cooling systems shall meet the minimum requirements of Section C403 and efficiency improvements shall be referenced to the minimum efficiency requirements listed in the tables in Section C403.3.2. Where multiple efficiency requirements are listed, equipment shall meet the seasonal efficiencies including SEER, EER/IEER, IPLV or AFUE. Equipment that is larger than the maximum capacity range indicated in the tables in Section C403.3.2 shall utilize the values listed for the largest capacity equipment for the associated equipment type shown in the table. Where multiple individual heating or cooling systems serve the project, the improvement shall be the weighted average improvement based on individual system capacity.

For occupancies and systems required to comply with Section C403.1.1, credits are permitted to be achieved by meeting the requirements of Section C406.2.2.1. Other systems are permitted to achieve credits by meeting the requirements of either:

1. Section C406.2.2.2, More efficient HVAC equipment cooling and fan performance.

2. Section C406.2.2.3, More efficient HVAC equipment heating performance.

3. Section C406.2.2.6, High performance dedicated outdoor air system (DOAS).

4. Any combination of Sections C406.2.2.2, C406.2.2.3, and C406.2.2.6.

In addition, energy credits are permitted to be achieved for Section C406.2.2.7, Fault detection and diagnostics, where not otherwise required by Section C403.2.3 or C403.6.10(15).

C406.2.2.1 Improved HVAC TSPR. For systems required to comply with Section C403.1.1, the HVAC TSPR shall exceed the minimum requirement by five percent. If improvement is greater, the credits in Table C406.2(1) are permitted to be prorated up to a 20 percent improvement.

C406.2.2.2 More efficient HVAC equipment cooling and fan performance. No less than 90 percent of the total HVAC capacity serving the total conditioned floor area of the entire building, building addition or tenant space in accordance with Section C406.1.1 shall comply with Sections C406.2.2.2.1 through C406.2.2.2.3. Where individual equipment efficiencies vary, weigh them based on capacity.

C406.2.2.2.1 HVAC system selection. Equipment installed shall be types that are listed in the tables in Section C403.3.2.

C406.2.2.2.2 Cooling equipment efficiency. Equipment shall exceed the minimum cooling efficiency requirements listed in the tables in Section C403.3.2 by at least 5 percent. Where equipment exceeds the minimum annual cooling efficiency and heat rejection efficiency requirements by more than 5 percent, energy efficiency credits for cooling shall be determined using Equation 4-15, rounded to the nearest whole number.

(Equation 4-15)

| | | --- |

| Where: | | | | | --- | --- | --- | --- | | | EECHEC | = | Energy efficiency credits for cooling efficiency improvement. | | | EEC5 | = | Section C406.2.2.2 credits from Table C406.2(1). | | | CEI | = | The lesser of the improvement above minimum cooling efficiency requirements, minimum heat rejection efficiency requirements, or 20 percent (0.20). Where cooling efficiency varies by system, use the capacity weighted average efficiency improvement for all cooling equipment combined. The CEI expressed as a fraction shall be determined one of the following ways: | | | | | For metrics that increase as efficiency increases, CEI shall be calculated as follows: |

| | CEI | = | CMDES | - 1 | | --- | --- | --- | --- | --- | | CMMIN | | | | | | | For metrics that decrease as efficiency increases, CEI shall be calculated as follows: | | | | | | CEI | = | CMMIN | - 1 | | CMDES | | | | |

| Where: | | | | | --- | --- | --- | --- | | | CMDES | = | Design cooling efficiency metric, part-load or annualized where available. | | | CMMIN | = | Minimum required cooling efficiency metric, part-load or annualized where available from Section C403.3.2. |

| | For data centers using ASHRAE 90.4, CEI shall be calculated as follows: | | | | | --- | --- | --- | --- | --- | | | CEI | = | AMLCMAX | - 1 | | AMLCDES | | | | |

| Where: | | | | | --- | --- | --- | --- | | | AMLCDES | = | As-designed annualized mechanical load component calculated in accordance with ASHRAE 90.4 Section 6.5. | | | AMLCMAX | = | Maximum annualized mechanical load component from ASHRAE 90.4 Table 6.5. |

C406.2.2.2.3 Minimum fan efficiency. Where fan energy is not included in packaged equipment rating or it is and the fan size has been increased from the as-rated equipment condition, fan power or horsepower shall be less than 95 percent of the allowed fan power in Section C403.8.1.

C406.2.2.3 More efficient HVAC equipment heating performance. No less than 90 percent of the total HVAC capacity serving the total conditioned floor area of the entire building, building addition or tenant space in accordance with Section C406.1.1 shall comply with Sections C406.2.2.3.1 through C406.2.2.3.2.

C406.2.2.3.1 HVAC system selection. Equipment installed shall be types that are listed in the tables in Section C403.3.2. Electric resistance heating shall be limited to 20 percent of system capacity, with the exception of heat pump supplemental heating.

C406.2.2.3.2 Heating equipment efficiency. Equipment shall exceed the minimum heating efficiency requirements of the tables in Section C403.3.2 by at least 5 percent. Where equipment exceeds the minimum annual heating efficiency requirements by more than 5 percent, energy efficiency credits for heating shall be determined using Equation 4-16, rounded to the nearest whole number.

(Equation 4-16)

| | | --- |

| Where: | | | | | --- | --- | --- | --- | | | EECHEH | = | Energy efficiency credits for heating efficiency improvement. | | | EEC5 | = | Section C406.2.2.2 credits from Table C406.2(1). | | | HEI | = | The lesser of the improvement above minimum heating efficiency requirements or 20 percent (0.20). Where heating efficiency varies by system, use the capacity weighted average percentage for all heating equipment combined. For metrics that increase as efficiency increases, HEI shall be calculated as follows: |

| | HEI | = | HMDES | - 1 | | --- | --- | --- | --- | --- | | HMMIN | | | | |

| Where: | | | | | --- | --- | --- | --- | | | HMDES | = | Design heating efficiency metric, part-load or annualized where available. | | | HMMIN | = | Minimum required heating efficiency metric, part-load or annualized where available from Section C403.3.2. |

| EXCEPTION: | In low energy spaces complying with Section C402.1.1 and semi-heated spaces complying with Section C402.1.1.2, no less than 90 percent of the installed heating capacity is provided by electric infrared or gas-fired radiant heating equipment for localized heating applications. Such spaces shall achieve credits for EEC5. | | --- | --- |

C406.2.2.4 Improved low-carbon district energy systems (10 percent better). Not less than 90 percent of the annual service hot water and space heating load, or not less than 90 percent of the annual service hot water, space heating, and space cooling load shall meet the criteria of Section C406.2.2.4.1 or C406.2.2.4.2.

Documentation for the low-carbon district system that is operational prior to the final inspection shall be provided to demonstrate that the definition as modified in Section C406.2.2.4.1 or C406.2.2.4.2 of low-carbon district energy exchange system is satisfied.

C406.2.2.4.1 Improved low-carbon district energy exchange systems (10 percent better). Low-carbon district energy exchange systems must demonstrate the following:

1. Forty-five percent of the annual district-system-net-load-met (sum of heating and cooling energy provided to attached buildings) comes from heat recovery between connected buildings, waste heat, or renewable energy resources; and

2. No more than 25 percent of the annual heat input to the system comes from fossil fuel or electric-resistance sources.

C406.2.2.4.2 Improved low-carbon district energy heating and cooling or heating only systems (10 percent better). Distribution losses must be accounted for and may not exceed 5 percent of the annual load delivered to buildings served by the system. Low-carbon district energy heating and cooling or heating only systems must demonstrate the following:

1. Forty-five percent of the annual district-system-net-load-met (sum of heating and cooling energy provided to attached buildings) comes from heat recovery between connected buildings, waste heat, or renewable energy resources and no more than 25 percent of the annual heat input to the system comes from fossil fuel or electric-resistance sources; or

2. No more than 10 percent of the system annual heat input to the system comes from fossil fuels or electric-resistance sources. The remaining annual heat input must be provided using heat pump technology with a minimum annual operating COP of 3.0.

C406.2.2.5 Improved low-carbon district energy systems (20 percent better). Not less than 90 percent of the annual service hot water and space heating load, or not less than 90 percent of the annual service hot water, space heating, and space cooling load shall meet the criteria of Section C406.2.2.5.1 or C406.2.2.5.2.

Documentation for the low-carbon district system that is operational prior to the final inspection shall be provided to demonstrate that the definition as modified in Section C406.2.2.4.1 or C406.2.2.4.2 of low-carbon district energy exchange system is satisfied.

C406.2.2.5.1 Improved low-carbon district energy exchange systems (20 percent better). Low-carbon district energy exchange systems must demonstrate the following:

1. Fifty percent of the annual district-system-net-load-met (sum of heating and cooling energy provided to attached buildings) comes from heat recovery between connected buildings, waste heat, or renewable energy resources; and

2. No more than 10 percent of the annual heat input to the system comes from fossil fuel or electric-resistance sources.

C406.2.2.5.2 Improved low-carbon district energy heating and cooling or heating only systems (20 percent better). Distribution losses must be accounted for and may not exceed 5 percent of the annual load delivered to buildings served by the system. Low-carbon district energy heating and cooling or heating only systems must demonstrate the following:

1. Fifty percent of the annual district-system-net-load-met (sum of heating and cooling energy provided to attached buildings) comes from heat recovery between connected buildings, waste heat, or renewable energy resources and no more than 10 percent of the annual heat input to the system comes from fossil fuel or electric-resistance sources; or

2. No more than 10 percent of the system annual heat input to the system comes from fossil fuels or electric-resistance sources. The remaining annual heat input must be provided using heat pump technology with a minimum annual operating COP of 4.0.

C406.2.2.6 High performance dedicated outdoor air system (DOAS). No less than 90 percent of the total conditioned floor area of the whole project, excluding floor area of unoccupied spaces that do not require ventilation as specified by the International Mechanical Code, shall be served by DOAS installed in accordance with Section C403.3.5 with the following adjustments:

1. Minimum heat recovery sensible effectiveness of 80 percent, calculated in accordance with Section C403.3.5.1.

2. Where design outdoor airflow is greater than 500 cfm (250 L/s), the DOAS shall be equipped with an economizer bypass, damper control, or wheel speed control that is active between 55°F (13°C) and 75°F (24°C) outdoor air temperature and minimizes energy recovery or maintains an appropriate DOAS leaving air temperature when the building is generally in cooling, based either on outdoor air temperature or a DDC zone-based cooling system reset.

3. DOAS total combined fan power shall be less than either:

3.1. 0.769 W/cfm (1.55 W/L/s) when calculated in accordance with Section C403.3.5.2.

3.2. Eighty percent of fan power allowance for a constant volume system when calculated in accordance with Section C403.8.1.

This option is not available to areas served by systems utilizing Section C403.2.2.1 exception 5.

C406.2.2.7 Fault detection and diagnostics system. A project not required to comply with Section C403.2.3 or C403.6.10(16) shall achieve energy credits for installing a fault detection and diagnostics system to monitor the HVAC system's performance and automatically identify faults. The installed system shall comply with items 1 through 6 in Section C403.2.3.

Reviser's note: The brackets and enclosed material in the text of the above section occurred in the copy filed by the agency.

Wash. Admin. Code § 51-11C-40623 Section C406.2.3—Lighting measures.

C406.2.3 Reduced lighting power. Interior lighting within the whole project shall achieve credits by complying with Section C406.2.3.1 or C406.2.3.2. In Group R-1 and Group R-2 occupancies, dwelling and sleeping units shall comply with Section C406.2.3.3 and all other areas shall comply with section C406.2.3.1 or C406.2.3.2. Credits apply to the whole Group R-1 or Group R-2 area.

C406.2.3.1 Reduced lighting power option 1. The total connected interior lighting power calculated in accordance with Section C405.4.1 shall be 90 percent or less of the lighting power values specified in Table C405.4.2(1) times the floor area for the building types, or 90 percent or less of the total interior lighting power allowance calculated in accordance with Section C405.4.2.

C406.2.3.2 Reduced lighting power option 2. The total connected interior lighting power calculated in accordance with Section C405.4.1 shall be 80 percent or less of the lighting power values specified in Table C405.4.2(1) times the floor area of the building types, or 80 percent or less of the total interior lighting power allowance calculated in accordance with Section C405.4.2.

C406.2.3.3 Lamp efficacy. No less than 95 percent of the permanently installed light fixtures in dwelling units and sleeping units shall be provided by lamps with a minimum efficacy of 90 lumens per watt.

C406.2.4 Lighting controls. For buildings with nontransient dwelling units and sleeping units, energy credits shall be achieved by installation of systems that comply with the requirements of Section C406.2.4.1. All other buildings shall achieve energy credits by complying with Section C406.2.4.2. For buildings with mixed occupancies, credits shall be prorated based on floor area.

C406.2.4.1 Residential building lighting control. In buildings with nontransient dwelling units and sleeping units, lighting controls shall be configured to meet the following:

1. Each dwelling unit or sleeping unit shall have a main control by the main entrance that turns off all the lights and switched receptacles in the unit. The main control shall be permitted to have two controls, one for permanently wired lighting and one for switched receptacles. The main controls shall be clearly identified as "lights master off" and "switched outlets master off."

2. Switched receptacles shall be clearly identified and all switched receptacles shall be located within 12 inches of an unswitched receptacle. Each room shall have a minimum of two switched receptacles except bathrooms, kitchens, and closets.

C406.2.4.2 Enhanced digital lighting controls. Measure credits shall be achieved where no less than 50 percent of the gross floor area within the project has luminaires and lighting controls that include high end trim in compliance with Section C405.2.8.3 and either luminaire-level lighting controls in compliance with Section C405.2.8.1 or networked lighting controls in accordance with Section C405.2.8.2. Where general lighting in more than 50 percent of the gross floor area complies, the base credits from Table C406.2(1) shall be prorated as follows:

| [Floor area with high end trim, %] x [Base energy credits for C406.2.4.2] / 50% | | --- |

Reviser's note: The brackets and enclosed material in the text of the above section occurred in the copy filed by the agency.

Wash. Admin. Code § 51-11C-40624 Section C406.2.5—Renewable energy measures.

C406.2.5 On-site and off-site renewable energy. Projects installing on-site or off-site renewable energy systems with a capacity of at least 0.1 watts per gross square foot (1.08 W/m2) of building area in addition to the renewable energy capacity required elsewhere in this code shall achieve energy credits for this measure. Renewable energy systems achieving energy credits shall not be used to satisfy other requirements of this code. Off-site renewable energy systems shall comply with Sections C411.2.2 and C411.2.3. Credits shall be prorated from the table value in accordance with Equation 4-17.

(Equation 4-17)

| | | --- |

| Where: | | | | | --- | --- | --- | --- | | | AECRRa | = | Section C406.2.5 achieved energy credits for this project as calculated in accordance with Equation 4-17, limited to 50 percent of the required credits in Section C406.1. | | | RRt | = | Actual total rating of on-site and off-site renewable energy systems (W) for each type of renewable energy source in Table C411.2.1. | | | RRr | = | Rating of renewable energy systems required by Section C411.1, other sections in this code, or used to qualify for exceptions in this code (W). | | | RRb | = | 0.1 W/square foot (1.08 W/m2) | | | PGFA | = | Project gross floor area, square feet (m2). | | | AECb | = | Section C406.2.5 base credits from Table C406.2(1). | | | REF | = | Renewable Energy Factor from Table C411.2.1. |

| Informative Note: | On-site renewable energy may include thermal service water heating or pool water heating, in which case ratings in Btu/h can be converted to W where W = Btu/h / 3.413. | | --- | --- |

History

• Statutory Authority: RCW 19.27A.020, 19.27A.025, 19.27A.160, chapters 19.27A and 19.27 RCW. WSR 24-03-085, § 51-11C-40624, filed 1/16/24, effective 3/15/24
• WSR 22-14-091, 23-12-101, and 23-20-021, § 51-11C-40624, filed 7/1/22, 6/7/23, and 9/25/23, effective 3/15/24.

Wash. Admin. Code § 51-11C-40625 Section C406.2.6—Service water measures.

C406.2.6 Reduced energy use in service water heating. Buildings with service hot water heating equipment that serves the whole building, building addition or tenant space shall achieve credits through compliance with:

1. Section C406.2.6.1, C406.2.6.2, or C406.2.6.3.

2. Sections C406.2.6.1 and C406.2.6.2.

3. Sections C406.2.6.1 and C406.2.6.3.

C406.2.6.1 Shower drain heat recovery. Shower drain heat recovery units shall comply with Section C404.10 and preheat cold water supply to the showers. Potable waterside pressure loss shall be less than 10 psi (69 kPa) at maximum design flow. The efficiency of drain water heat recovery units shall be 54 percent in accordance with CSA B55.1. Full credits are applicable to the following building use types: Multi-family, hotel, motel, dormitory, and schools with locker room showers. Where not all showers in the project have drain heat recovery, the credit is adjusted based on the following:

| [Section C406.2.6.1 table credits] x [Showers with drain recovery] / [Total number of showers] | | --- |

C406.2.6.2 Service water heating energy recovery. Not less than 30 percent of the annual service hot water heating energy use, or not less than 70 percent of the annual service hot water heating energy use in buildings with condenser water systems subject to the requirements of Section C403.9.2.1 or qualifying for one of its exceptions, shall be provided by one or more of the following:

1. Waste heat recovery from service hot water, heat recovery chillers, building equipment, process equipment, or other approved system. Qualifying heat recovery must be above and beyond heat recovery required by other sections of this code.

2. On-site renewable energy water-heating systems where not used to meet other requirements or to obtain other energy credits.

C406.2.6.3 Heat pump water heating. Projects shall achieve credits through compliance with Section C406.2.6.3.1.

C406.2.6.3.1 Heat pump water heater. Credit shall be achieved where the primary heat pump service water heating system is sized to deliver no less than 100 percent of the net calculated demand for service water production during the peak demand period with entering dry bulb or wet bulb outdoor air temperature at 40°F (4°C) for air-source heat pumps, or 44°F (7°C) ground temperature for ground-source heat pumps, as calculated using the equipment manufacturer's selection criteria or another approved methodology. For this credit, the net calculated demand shall be the gross building demand less any portion of the demand complying with the exceptions to Section C404.2.1. Supplemental heating is permitted in accordance with Section C404.2.1, but cannot use fossil fuels. Heat pump water heaters shall comply with one of the following:

1. The COP rating shall be a minimum COP of 3.0 reported at the design leaving heat pump water temperature with an entering air temperature of 60°F (16°C) or lower. For water-source equipment, the COP rating will be reported at the design leaving load water temperature with an entering load water temperature of 74°F (23°C) or lower.

2. The uniform energy factor (UEF) shall be a minimum of 3.40 rated based on U.S. Department of Energy requirements.

C406.2.6.4 High efficiency service water heating, gas-fired. The credit achieved shall be from Table C406.2(2) where hot water is supplied by gas-fired equipment with minimum efficiency of 0.91 UEF.

C406.2.7 Improved service hot water temperature maintenance. For buildings with gross floor area greater than 10,000 square feet, credit shall be achieved when hot water temperature maintenance is installed in accordance with Section C406.2.7.1 or C406.2.7.2.

C406.2.7.1 Self-regulated heat trace system. The credit achieved shall be from Table C406.2(1). This system shall include self-regulating electric heat cables, connection kits and electronic controls. The cable shall be installed directly on the hot water supply pipes underneath the insulation to replace standby losses.

C406.2.7.2. Point of use water heater. The credit achieved shall be from Table C406.2(1) where any fixtures requiring hot water shall be supplied from a localized electric source of hot water with no recirculation or heat trace and limited to 2 kW and 6 gallons of storage. The supply pipe length from the point of use water heater to the termination of the fixture supply pipe shall be no more than 20 feet.

C406.2.8 Service hot water distribution right sizing. To achieve this credit, where Group R-1 and R-2 occupancies are served by a central service hot water system, the distribution system serving dwelling units, sleeping units and guestrooms shall be sized using Appendix M of the Uniform Plumbing Code.

C406.2.9 High performance service hot water temperature maintenance system. Systems with multiple riser service hot water circulation systems shall use only heat pump technology for temperature maintenance. The heat pump technology shall have a minimum COP of 3.0 or UEF of 3.4. For air-source equipment, the COP rating will be reported at the design leaving heat pump water temperature with an entering dry bulb air temperature of 60°F (16°C) or lower and a relative humidity of 50 percent or lower. For water-source equipment, the COP rating will be reported at the design leaving load side water temperature with an entering source side water temperature of 74°F (23°C) or lower. The system shall comply with the requirements of Section C404.7.1.

C406.2.10 High efficiency service hot water circulation system. Multiple riser service hot water circulation systems shall use a variable volume circulation pump controlled to vary the pump speed based on system demand and shall include self-actuated thermostatic balancing valves to control the system flow at each riser.

C406.2.11 Low flow showerheads for Group R-1 and R-2 occupancies. All showerheads installed in Group R-1 and R-2 dwelling units or sleeping units shall have a maximum listed flowrate of 1.25 gallons per minute or less at 80 psi operating pressure for fixed showerheads and a maximum listed flowrate of 1.50 gallons per minute or less at 80 psi operating pressure for handheld showerheads. When a shower is served by more than one showerhead, including handheld showerheads, the combined flow rate of all showerheads and/or other shower outlets controlled by a single valve shall not exceed 1.25 gallons per minute or less for fixed or 1.5 gallons per minute or less for handheld, or the shower shall be designed to allow only one shower outlet to be in operation at a time.

Reviser's note: The brackets and enclosed material in the text of the above section occurred in the copy filed by the agency.

Wash. Admin. Code § 51-11C-40626 Section C406.2—Envelope measures.

C406.2.12 Enhanced envelope performance. The Proposed Total UA of the thermal envelope of the project shall be 15 percent lower than the Allowable Total UA determined in accordance with Section C402.1.5 and Equation 4-2.

C406.2.13 Reduced air leakage. Energy credits shall be achieved where measured air leakage of the total conditioned floor area of the whole building, fully isolated building addition or tenant space is determined in accordance with Section C402.5.1.2 and complies with the maximum leakage in either Section C406.2.13.1 or C406.2.13.2.

C406.2.13.1 Base reduced air leakage. Measured air leakage shall not exceed 68 percent of the maximum leakage allowed by Section C402.5.1.2.

C406.2.13.2 Enhanced reduced air leakage. Measured air leakage shall not exceed 33 percent of the maximum leakage allowed by Section C402.5.1.2.

History

• Statutory Authority: RCW 19.27A.020, 19.27A.025, 19.27A.160 and chapters 19.27A and 19.27 RCW. WSR 22-14-091, 23-12-101, and 23-20-021, § 51-11C-40626, filed 7/1/22, 6/7/23, and 9/25/23, effective 3/15/24.

Wash. Admin. Code § 51-11C-40627 Section C406.2—Other measures.

C406.2.14 Enhanced commercial kitchen equipment. For buildings or areas designated as Group A-2, or facilities whose primary business type involves the use of a commercial kitchen with at least one gas or electric fryer, all fryers, dishwashers, steam cookers and ovens shall comply with all of the following:

1. Achieve the ENERGY STAR label in accordance with the specifications current as of January 1, 2022.

2. Be installed prior to the issuance of the certificate of occupancy.

3. Have the ENERGY STAR qualified model number listed on the construction documents submitted for permitting.

Energy efficiency credits for efficient commercial kitchen equipment shall be determined based on Equation 4-19, rounded to the nearest whole number.

(Equation 4-19)

| | | --- |

| Where: | | | | | --- | --- | --- | --- | | | AEECK | = | Section C406.2.14 table credits, to a maximum of those allowed in Table C406.2(1) for this option. | | | AreaK | = | Floor area of full-service kitchen (ft2 or m2). | | | AreaB | = | Gross floor area of building (ft2 or m2). |

C406.2.15 Residential kitchen equipment. For projects with Group R-1 and R-2 occupancies, energy credits shall be achieved where not less than 90 percent of dishwashers, refrigerators, and freezers comply with all of the following:

1. Achieve the ENERGY STAR Most Efficient label in accordance with the 2021 specifications.

2. Be installed prior to the issuance of the certificate of occupancy.

For Group R-1 where only some guestrooms are equipped with both refrigerators and dishwashers, the table credits shall be prorated as follows:

| [Section C406.2.15 table credits] x [Floor area of guestrooms with kitchens] / [Total guestroom floor area] | | --- |

C406.2.16 Residential laundry appliances. For projects with Group R-2 occupancies, energy credits shall be achieved where not less than 90 percent of clothes washers and dryers in the project meet the following requirements:

1. Each dwelling unit contains in-unit washing washer and dryer equipment that meets the following requirements:

1.1. Achieve the ENERGY STAR Most Efficient label in accordance with the 2021 specifications.

1.2. Be installed prior to the issuance of the certificate of occupancy.

2. Where only some dwelling units are equipped with both washers and dryers, the table credits shall be prorated as follows:

| [Section C406.2.16 table credits] x [Floor area of dwelling units with laundry] / [Total dwelling unit floor area] | | --- |

C406.2.17 Heat pump clothes dryers. Not less than 90 percent of domestic clothes dryers located in Group R-1 and R-2 of the whole project are ENERGY STAR rated heat pump dryers. Credit applies only to buildings where laundry facilities are provided either within each residential dwelling or sleeping units or grouped together in central multi-family use laundry rooms, or a mix of the two.

To claim this credit, the building permit drawings shall specify the appliance type and provide documentation of ENERGY STAR compliance. At the time of inspection, all appliances shall be installed and connected to utilities.

C406.2.18 Efficient elevator equipment. Qualifying elevators in the building shall be Energy Efficient Class A in accordance with ISO 25745-2, Table 7. Only buildings three or more floors above grade shall be permitted to use this credit. Credits shall be prorated based on Equation 4-18, rounded to the nearest whole credit. Projects with a compliance ratio (CRe in Equation 4-18) below 0.5 do not qualify for this credit.

(Equation 4-18)

| | | --- |

| Where: | | | | | | --- | --- | --- | --- | --- | | | ECe | = | Elevator energy credit achieved for building. | | | | ECt | = | Section C406.2.18 table energy credit. | | | | CRe | = | FA | | | | FB | | | | | | FA | = | Sum of floors served by Class A elevators. | | | | FB | = | Sum of floors served by all building elevators and escalators. | |

Reviser's note: The brackets and enclosed material in the text of the above section occurred in the copy filed by the agency.

Wash. Admin. Code § 51-11C-40630 Section C406.3—Load management credits.

C406.3 Load management credits. Load management measures installed in the building that meet the requirements in Sections C406.3.1 through C406.3.7 shall achieve the credits listed for the occupancy group in Table C406.3 or where calculations required by Sections C406.3.1 through C406.3.7 create or modify the table credits the credits achieved will be based upon the section calculations.

Each load management measure shall require automatic controls activated by either utility demand response, utility price response signal, peak price period time control, or local building demand monitoring. Controls shall be capable of and configured to provide the required load management sequences. As used in this section, "peak period" shall be either the coincident peak building load period, the peak price period, the peak utility load period, or the peak building demand period. The following additional requirements apply to these measures:

1. Where credit is taken for C406.3.6, service water heating energy storage, the equipment shall be provided with controls that comply with ANSI/CTA 2045-B.

2. For load management measures in Sections C406.3.1 through C406.3.5:

2.1. Where the serving utility has a real-time demand response or pricing program, an interface compliant with serving utility requirements shall be installed.

2.2. Where the serving utility does not have a real-time demand response or pricing program, a digital input to the system to support future utility programs shall be installed and building demand monitoring shall be installed and integrated into the load management sequence.

2.3. All equipment involved in the required load management sequence shall have controls connected to a central DDC system.

Table C406.3

Load Management Measure Credits

| Measure Title | Applicable Section | Occupancy Group | | | | | | | --- | --- | --- | --- | --- | --- | --- | --- | | Group R-1 | Group R-2 | Group B | Group E | Group M | All Other | | | | 1. Lighting load management | C406.3.1 | 12 | 15 | 27 | 15 | NA | NA | | 2. HVAC load management | C406.3.2 | 29 | 24 | 42 | 23 | 13 | 26 | | 3. Automated shading | C406.3.3 | NA | 7 | 12 | 16 | NA | NA | | 4. Electric energy storage | C406.3.4 | 41 | 50 | 126 | 72 | 37 | 65 | | 5. Cooling energy storage | C406.3.5 | 13 | 10 | 14 | 19 | NA | 14 | | 6. Service hot water energy storage | C406.3.6 | 31 | 248 | 59 | 8 | 5 | 70 | | 7. Building thermal mass | C406.3.7 | NA | NA | 50 | 95 | 96 | 80 |

C406.3.1 Lighting load management. Automatic controls shall be capable of gradually reducing general lighting power with continuous dimming in 75 percent of the building area by at least 20 percent during peak demand periods. Where less than 75 percent, but at least 50 percent, of the building area lighting is controlled, the credits from Table C406.3 shall be prorated as follows:

| | [Area of building with lighting load management, %] × [Table credits for C406.3.1] | | | --- | --- | --- | | | 75% | |

| EXCEPTION: | Warehouse or retail storage building areas shall be permitted to achieve this credit by switching off at least 25 percent of lighting power in 75 percent of the building area without dimming. | | --- | --- |

C406.3.2 HVAC load management. Automatic controls shall:

1. Where electric cooling is used, be configured to gradually increase, over a minimum of three hours, the cooling setpoint by at least 3°F during the summer peak periods.

2. Where electric heating is used, be configured to gradually reduce, over a minimum of three hours, the heating setpoint by at least 3°F during winter peak periods.

C406.3.3 Automated shading load management. Where fenestration on south and west exposures exceeds 20 percent of the wall area, automatic controls shall be configured to operate movable exterior shading devices or dynamic glazing to reduce solar gain through sunlit fenestration on southern and western exposures by at least 50 percent during summer peak periods.

| Informative Note: | This credit can be met by exterior roller, movable blind or movable shutter shading devices; however, fixed overhang, screen or shutter shading will not meet the requirement. Roller shades that reject solar gain but still allow a view are allowed as long as they provide an effective 50 percent reduction in net solar gain (e.g., have a shading coefficient of less than 0.5 for the shading material itself). Interior shading devices will not meet the requirement. Electrochromatic windows that achieve 50 percent of SHGC would qualify. | | --- | --- |

C406.3.4 Electric energy storage. Automatic controls shall store electricity in electric storage devices during nonpeak periods and use stored energy during peak periods. Electric storage devices shall have a minimum capacity of 5 Wh/ft2 (58 Wh/m2) of gross building area. For greater storage capacity up to 15 Wh/ft2 (160 Wh/m2), credits shall be prorated as follows:

| [Installed electric storage capacity, Wh/ft2] × [C406.3.4 credits from Table C406.3] | | --- |

C406.3.5 Cooling energy storage. Automatic controls shall be capable of activating ice or chilled water storage to reduce peak period electric demand. Credits shown in Table C406.3 are based on storage capacity of 2 ton-hours per design day ton of cooling load (2 kWh per design day kW) with a 1.15 sizing factor. Credits shall be prorated for installed storage systems sized between 0.5 and 3.5 ton-hours per design day ton (kWh per design day kW) of cooling load rounded to the nearest whole credit. The storage tank shall have no more than 1.5 percent of storage capacity standby loss per day.

C406.3.6 Service hot water energy storage. To achieve this credit, where service hot water is heated by electricity, automatic controls shall preheat stored service hot water before the peak period and suspend electric water heating during the peak period. Storage capacity shall be provided by either:

1. Preheating water above 140°F (60°C) delivery temperature with at least 1.34 kWh of energy storage per kW of water heating capacity. Tempering valves shall be provided at the water heater delivery location.

2. Providing additional heated water tank storage capacity above peak service hot water demand with equivalent peak storage capacity to item 1.

C406.3.7 Building thermal mass. To achieve this credit, the building shall have both additional passive interior mass and a night-flush control of the HVAC system.

1. Interior to the building thermal envelope insulation, provide 15 pounds of passive thermal mass per square foot of building floor area. Mass construction shall be in the building interior and the indoor facing portion of the exterior wall, and interior floor construction. Mass construction shall have mass surfaces in direct contact with the air in conditioned spaces with directly attached wall board or hard surface flooring allowed. Mass with carpet or furred wallboard shall not be counted toward the building mass required. For integral insulated concrete block walls complying with ASTM C90, only the mass of the interior face shall be counted toward the building mass required.

2. When summer mode is active and indoor average temperature is 5°F (3°C) or more above outdoor temperature and between 10:00 p.m. and 6:00 a.m., automatic night flush controls shall operate outdoor air economizers at low fan speed less than 66 percent during the unoccupied period until the average indoor air temperature falls to the occupied heating setpoint. Summer mode shall be activated when outdoor air exceeds 70°F (21°C) and continues until deactivated when outdoor air falls below 45°F (7°C). Another night flush strategy shall be permitted where demonstrated to be effective, avoids added morning heating and is approved by the code official.

| Informative Note: | The simplified night flush sequence described will operate in "summer mode" below the 70°F outdoor air trigger temperature down until outdoor air of 45°F is hit when the "summer mode" is deactivated until the outdoor air temperature rises above 70°F again. Other strategies may be implemented that cool the space below the heating setpoint and adjust the morning heating setpoint to avoid morning reheating. | | --- | --- |

Reviser's note: The brackets and enclosed material in the text of the above section occurred in the copy filed by the agency.

Wash. Admin. Code § 51-11C-40700 Section C407—Total building performance.

History

• Statutory Authority: RCW 19.27A.020, 19.27A.025 and chapters 19.27 and 34.05 RCW. WSR 13-04-056, § 51-11C-40700, filed 2/1/13, effective 7/1/13.

Wash. Admin. Code § 51-11C-40701 Section C407.1—Scope.

C407.1 Scope. This section establishes criteria for compliance using total building performance. All systems and loads shall be included in determining the total building performance including, but not limited to: Heating systems, cooling systems, service water heating, fan systems, lighting power, receptacle loads and process loads.

| EXCEPTION: | Energy used to recharge or refuel vehicles that are used for on-road and off-site transportation purposes. | | --- | --- |

History

• Statutory Authority: RCW 19.27A.020, 19.27A.025, 19.27A.160 and chapter 19.27 RCW. WSR 19-24-040, § 51-11C-40701, filed 11/26/19, effective 7/1/20. Statutory Authority: RCW 19.27A.020, 19.27A.025 and chapters 19.27 and 34.05 RCW. WSR 13-04-056, § 51-11C-40701, filed 2/1/13, effective 7/1/13.

Wash. Admin. Code § 51-11C-40702 Section C407.2—Mandatory requirements.

C407.2 Mandatory requirements. Compliance with Section C407 also requires compliance with those sections shown in Table C407.2.

The building permit application for projects utilizing this method shall include in one submittal all building and mechanical drawings and all information necessary to verify that the building envelope and mechanical design for the project corresponds with the annual energy analysis. If credit is proposed to be taken for lighting energy savings, then an electrical permit application shall also be submitted and approved prior to the issuance of the building permit. If credit is proposed to be taken for energy savings from other components, then the corresponding permit application (e.g., plumbing, boiler, etc.) shall also be submitted and approved prior to the building permit application. Otherwise, components of the project that would not be approved as part of a building permit application shall be modeled in the baseline in accordance with ANSI/ASHRAE/IESNA 90.1 Appendix G and in the proposed model in accordance with the requirements of the Washington State Energy Code.

Table C407.2

Mandatory Compliance Measures for Total Building Performance Method

| Sectiona | Title | Comments | | --- | --- | --- | | Envelope | | | | C401 | Thermal envelope certificate | | | C402.2.7 | Airspaces | | | C402.5 | Air leakage | | | Mechanical | | | | C403.1.2 | Calculation of heating and cooling loads | | | C403.1.3 | Data centers | | | C403.2 | System design | | | C403.3.1 | Equipment and system sizing | | | C403.3.2 | HVAC equipment performance requirements | | | C403.3.3 | Hot gas bypass limitation | | | C403.3.4.4 | Boiler turndown | | | C403.4.1 | Thermostatic controls | | | C403.4.2 | Off-hour controls | | | C403.4.7 | Combustion heating equipment controls | | | C403.4.8 | Group R-1 hotel/motel guestrooms | See Section C403.7.4 | | C403.4.9 | Group R-2 and R-3 dwelling units | | | C403.4.10 | Group R-2 sleeping units | | | C403.4.11 | Direct digital control systems | | | C403.5.5 | Economizer fault detection and diagnostics (FDD) | | | C403.7 | Ventilation and exhaust systems | Except for C403.7.6.2 | | C403.8 | Fan and fan controls | | | C403.9.1.1 | Variable flow controls | For cooling tower fans ≥ 7.5 hp | | C403.9.1.2 | Limitation on centrifugal fan cooling towers | For open cooling towers | | C403.10 | Construction of HVAC elements | | | C403.11 | Mechanical systems located outside of the building thermal envelope | | | C403.14 | Commissioning | | | Service Water Heating | | | | C404 | Service water heating | Except for C404.2.1 | | Lighting and Electrical | | | | C405 | Electrical power and lighting systems | | | Other Requirements | | | | C407 | Total building performance | | | C408 | System commissioning | | | C409 | Energy metering | | | C410 | Refrigeration requirements | | | C411b | Renewable energy | | | C412 | Compressed air systems | |

| a | Reference to a code section includes all the relative subsections except as indicated in the table. | | --- | --- | | b | Compliance with any of these sections includes compliance with any exception to that section. |

History

• Statutory Authority: RCW 19.27A.020, 19.27A.025, 19.27A.160, chapters 19.27A and 19.27 RCW. WSR 24-03-085, § 51-11C-40702, filed 1/16/24, effective 3/15/24
• WSR 22-14-091, 23-12-101, and 23-20-021, § 51-11C-40702, filed 7/1/22, 6/7/23, and 9/25/23, effective 3/15/24. Statutory Authority: RCW 19.27A.025, 19.27A.045 and chapter 19.27 RCW. WSR 20-21-080, § 51-11C-40702, filed 10/19/20, effective 2/1/21. Statutory Authority: RCW 19.27A.020, 19.27A.025, 19.27A.160 and chapter 19.27 RCW. WSR 19-24-040, § 51-11C-40702, filed 11/26/19, effective 7/1/20. Statutory Authority: RCW 19.27A.025, 19.27A.160, and 19.27.074. WSR 16-03-072, § 51-11C-40702, filed 1/19/16, effective 7/1/16. Statutory Authority: RCW 19.27A.020, 19.27A.025 and chapters 19.27 and 34.05 RCW. WSR 13-04-056, § 51-11C-40702, filed 2/1/13, effective 7/1/13.

Wash. Admin. Code § 51-11C-40703 Section C407.3—Performance-based compliance.

C407.3 Performance-based compliance. Compliance with this section requires compliance with ASHRAE Standard 90.1 Appendix G, Performance Rating Method, in accordance with Standard 90.1 Section 4.2.1 with the following modifications:

1. The mandatory requirements of the Washington State Energy Code are required to be met, instead of those of Section G1.2.1a of ANSI/ASHRAE/IESNA 90.1.

2. Compliance with Section C407 requires meeting both a regulated site energy target and a total site energy reduction target in accordance with the following:

2.1. Regulated site energy target. The regulated site energy target is focused on regulated load energy efficiency, thus shall be met only via regulated load savings without consideration of the contribution of on-site or off-site renewable energy or unregulated load savings. Adjustments to the PCI, to account for the contribution of renewable energy found in ANSI/ASHRAE/IESNA 90.1 Section 4.2.1.1 shall not be used. References to energy cost in Section 4.2.1.1 and Appendix G shall be replaced by site energy use. Heating or cooling energy provided by a district energy system may utilize coefficient of performance (COP) ratios acceptable to the code official for the respective district energy sources. The building performance factors in Table 4.2.1.1 of ANSI/ASHRAE/IESNA 90.1 shall be replaced with those in Table C407.3(2).

2.2. Total site energy target. The total site energy performance target shall be met including the contributions of on-site or off-site renewable energy as described in Section C411.2 as well as the contributions of improvements in unregulated loads as allowed by Section C407.3.4. The annual on-site and off-site renewable energy production (as adjusted by the factors in Table C411.2.1) shall be subtracted from the proposed building annual site energy use. Compliance with the site energy performance target requires that the proposed building site energy use/baseline building site energy use is less than or equal to the site energy performance target from Table C407.3(3).

3. Documentation requirements in Section G1.3.2.d shall be replaced by a list showing compliance with the mandatory provisions of Table C407.2.

4. Forms demonstrating compliance with Appendix G developed by the U.S. Department of Energy shall be completed and submitted to the code official. The forms are available at energycodes.gov/ashrae-standard-901-performance-based-compliance-form.

5. References to yet-to-be-designed future building components in the Proposed Building Performance column of Table G3.1 shall be modified to reference the corresponding sections of the Washington State Energy Code in lieu of the requirements of ANSI/ASHRAE/IESNA 90.1 in the following sections of the table:

5.1. No. 1, Design Model, subclause c.

5.2. No. 6, Lighting, subclause c.

5.3. No. 11, Service Water Heating System, subclause c.

5.4. No. 12, Receptacle and Other Loads, subclause b.

6. HVAC systems, subclauses c and d of Table G3.1, shall meet the following requirements:

6.1. For yet-to-be-designed systems in office, retail, library, education, and multifamily buildings and occupancies subject to the TSPR requirements of Section C403.1.1, the system type and efficiency parameters in the proposed model shall meet but not exceed those shown in Table D602.11 Standard Reference Design HVAC Systems.

6.2. For all other buildings and occupancies, the system type shall be the same as the system modeled in the baseline design and shall comply with but not exceed the requirements of Section C403 in lieu of ANSI/ASHRAE/IESNA 90.1.

6.3. For HVAC systems serving future tenant spaces, where the current building permit applies to only a portion of an HVAC system, and future components will receive HVAC services from systems included in the current building permit, those future components shall be modeled as the type required to complete the HVAC system portions under the current permit and shall meet but not exceed the requirements found in Section C403.

7. The requirements for proposed and baseline building lighting system shall be modified in accordance with Addendum af to ANSI/ASHRAE/IESNA 90.1.

8. Energy modeler qualifications. The energy analyst in responsible charge of the Section C407 submittal shall meet at least one of the following:

8.1. ASHRAE Building Energy Modeling Professional (BEMP) certification.

8.2. Association of Energy Engineer's Building Energy Simulation Analyst (BESA) certification.

8.3. Successful completion of at least five projects modeled following any version of ANSI/ASHRAE/IESNA 90.1 Appendix G within the last three years that were reviewed and approved by a code official or rating authority.

C407.3.1 Limits on nonmandatory measures. The Proposed Total UA of the proposed building shall be no more than 20 percent higher than the Allowed Total UA as defined in Section C402.1.5.

C407.3.2 On-site and off-site renewable energy accounting for use with Appendix G. Qualifying on-site and off-site renewable energy delivered or credited to the building project to comply with Section C407.3 item 2.2 shall meet the requirements of Section C411.2.

C407.3.3 Low-carbon district energy use with Appendix G. Qualifying low-carbon district heating and cooling or heating only systems and low-carbon district energy exchange systems shall meet the requirements of Section C407.3.3.1 or C407.3.3.2, as applicable.

C407.3.3.1 Utilization of low-carbon district heating and cooling or heating only systems. Applicable if heating and cooling or heating only is provided to the proposed building from a low-carbon district heating and cooling or heating only system that is fully operational prior to the final inspection. Proposed model shall account for all on-site HVAC and service hot water related equipment, such as circulation pump energy and heat-exchanger efficiency.

1. The following modifications shall be applied to Appendix G of ANSI/ASHRAE/IESNA 90.1 in addition to what is described in Section C407.3:

1.1. For low-carbon district heating and cooling systems, strike the text of Sections G3.1.1.1, G3.1.1.2, G3.1.1.3.1, G3.1.1.3.3, and G3.1.1.3.4. Baseline system shall be selected based on unmodified versions of Tables G3.1.1-3 and G3.1.1-4, comparing energy use to determine compliance.

1.2. For low-carbon district heating only systems, strike the text of Sections G3.1.1.1, G3.1.1.3.1, and G3.1.1.3.4. Baseline system shall be selected based on unmodified versions of Tables G3.1.1-3 and G3.1.1-4, with carbon emission factors from Table C407.3(1).

2. Any heating or cooling energy provided by the low-carbon district heating and cooling or heating only system shall utilize a calculated energy use reduction factor acceptable to the code official to account for energy use reduction from those end uses.

3. Energy "credit" for any waste/recoverable heat exported to the low-carbon district heating and cooling or heating only systems shall be accounted for in the proposed design by multiplying the quantity of heat exported by the appropriate seasonal utilization factor in Items 3.1 and 3.2 below. This energy "credit" is subtracted from the total proposed design energy use calculated in accordance with ASHRAE 90.1 Section 4.2.1.1.

3.1. Fifty percent of the waste heat exported to the low-carbon district heating and cooling or heating only systems during the months of October through December and January through March.

3.2. Twenty-five percent of the waste heat exported to the low-carbon district heating and cooling or heating only systems during the months of April through September.

| EXCEPTION: | Waste heat exported from the building to the low-carbon district heating and cooling or heating only system shall not be subtracted from the proposed design energy use if they are already accounted for in the calculation of energy use from the district heating or cooling plant as part of the district energy efficiency factor. | | --- | --- |

Documentation for the low-carbon district system that is operational prior to the final inspection shall be provided to demonstrate the following:

1. Distribution losses must be accounted for and may not exceed 10 percent of the annual load delivered to buildings served by the system.

2. Twenty-five percent of the annual district-system-net-load-met (sum of heating and cooling energy provided to attached buildings) comes from heat recovery between connected buildings, waste heat or renewable energy resources and no more than 25 percent of the annual heat input to the system comes from fossil fuel or electric-resistance sources, or not more than 10 percent of the system annual heat input to the system comes from fossil fuel or electric-resistance sources.

C407.3.3.2 Utilization of low-carbon district energy exchange systems. Applicable if heating or cooling is provided to the proposed building from a low-carbon district energy exchange system that is fully operational prior to the final inspection. Proposed model shall account for all on-site HVAC and service hot water related equipment, such as circulation pump energy and heat-exchanger efficiency.

1. The following modifications shall be applied to Appendix G of ANSI/ASHRAE/IESNA 90.1 in addition to what is described in Section C407.3:

1.1. Strike the text of Sections G3.1.1.1, G3.1.1.2, G3.1.1.3, G3.1.1.3.1, G3.1.1.3.2, G3.1.1.3.3, and G3.1.1.3.4. Baseline system shall be selected based on unmodified versions of Tables G3.1.1-3 and G3.1.1-4.

2. Any heating or cooling energy provided by a low-carbon district energy exchange system shall utilize a calculated energy use reduction factor acceptable to the code official to account for the reduction in the proposed model.

3. Energy use "credit" for any waste/recoverable heating exported to the low-carbon district energy exchange system shall be accounted for in the proposed design by multiplying the quantity of heat exported by the appropriate seasonal utilization factor in Items 3.1 and 3.2 below. This energy use "credit" is subtracted from the total proposed design energy use calculated in accordance with ASHRAE 90.1 Section 4.2.1.1.

3.1. Fifty percent of the waste heat exported to the low-carbon district energy exchange system during the months of October through December and January through March.

3.2. Twenty-five percent of the waste heat exported to the low-carbon district energy exchange system during the months of April through September.

| EXCEPTION: | Waste heat exported from the building to the low-carbon district heating and cooling or heating only system shall not be subtracted from the proposed design energy use if they are already accounted for in the calculation of energy use from the district heating or cooling plant as a part of the district energy efficiency factor. | | --- | --- |

Documentation for the low-carbon district system that is operational prior to the final inspection shall be provided to demonstrate that the definition of low-carbon district energy exchange system is satisfied.

C407.3.4 Credit for improvements in unregulated loads when using Appendix G. When calculating savings for site energy targets in accordance with Section C407.3 item 2.2, but not when calculating savings for emissions targets in accordance with Section C407.3 item 2.1, differences in the simulation of unregulated loads and equipment modeled in the baseline building design from those in the proposed design shall be approved by the code official based on documentation that the equipment installed in the proposed design represents a significant verifiable departure from documented current conventional practice. All unregulated equipment for which savings is claimed must be installed by the time of final inspection. The burden of this documentation is to demonstrate that accepted conventional practice would result in baseline building equipment different from that installed in the proposed design. Occupancy and occupancy schedules shall not be changed.

History

• Statutory Authority: RCW 19.27A.020, 19.27A.025, 19.27A.160, chapters 19.27A and 19.27 RCW. WSR 24-03-085, § 51-11C-40703, filed 1/16/24, effective 3/15/24
• WSR 22-14-091, 23-12-101, and 23-20-021, § 51-11C-40703, filed 7/1/22, 6/7/23, and 9/25/23, effective 3/15/24. Statutory Authority: RCW 19.27A.020, 19.27A.025, 19.27A.160 and chapter 19.27 RCW. WSR 19-24-040, § 51-11C-40703, filed 11/26/19, effective 7/1/20. Statutory Authority: RCW 19.27A.025, 19.27A.160, and 19.27.074. WSR 16-03-072, § 51-11C-40703, filed 1/19/16, effective 7/1/16. Statutory Authority: RCW 19.27A.020, 19.27A.025 and chapters 19.27 and 34.05 RCW. WSR 13-04-056, § 51-11C-40703, filed 2/1/13, effective 7/1/13.

Wash. Admin. Code § 51-11C-407031 Tables for Section C407.3.

Table C407.3(1)

Reserved

Table C407.3(2)

Building Performance Factors (BPF) to be used for Compliance with Section C407.3

| Building Area Type | Building Performance Factor | | --- | --- | | Multifamily | 0.51 | | Health care/hospital | 0.70 | | Hotel/motel | 0.51 | | Office | 0.44 | | Restaurant | 0.33 | | Retail | 0.41 | | School | 0.35 | | Warehouse | 0.18 | | All others | 0.43 |

Table C407.3(3)

Site Energy Performance Targets to be used for Compliance with Section C407.3

| Building Area Type | Site Energy Performance Targets | | --- | --- | | Multifamily | 0.59 | | Health care/hospital | 0.72 | | Hotel/motel | 0.62 | | Office | 0.58 | | Restaurant | 0.59 | | Retail | 0.46 | | School | 0.52 | | Warehouse | 0.29 | | All others | 0.55 |

History

• Statutory Authority: RCW 19.27A.020, 19.27A.025, 19.27A.160, chapters 19.27A and 19.27 RCW. WSR 24-03-085, § 51-11C-407031, filed 1/16/24, effective 3/15/24
• WSR 22-14-091, 23-12-101, and 23-20-021, § 51-11C-407031, filed 7/1/22, 6/7/23, and 9/25/23, effective 3/15/24.

Wash. Admin. Code § 51-11C-40704 Section C407.4—Reserved.

History

• Statutory Authority: RCW 19.27A.020, 19.27A.025, 19.27A.160 and chapter 19.27 RCW. WSR 19-24-040, § 51-11C-40704, filed 11/26/19, effective 7/1/20. Statutory Authority: RCW 19.27A.020, 19.27A.025 and chapters 19.27 and 34.05 RCW. WSR 13-04-056, § 51-11C-40704, filed 2/1/13, effective 7/1/13.

Wash. Admin. Code § 51-11C-40705 Section C407.5—Reserved.

History

• Statutory Authority: RCW 19.27A.020, 19.27A.025, 19.27A.160 and chapter 19.27 RCW. WSR 19-24-040, § 51-11C-40705, filed 11/26/19, effective 7/1/20. Statutory Authority: RCW 19.27A.025, 19.27A.160, and 19.27.074. WSR 16-03-072, § 51-11C-40705, filed 1/19/16, effective 7/1/16. Statutory Authority: RCW 19.27A.025, 19.27A.045, 19.27.020, and 19.27.074. WSR 14-24-122, § 51-11C-40705, filed 12/3/14, effective 1/3/15. Statutory Authority: RCW 19.27A.020, 19.27A.025 and chapters 19.27 and 34.05 RCW. WSR 13-04-056, § 51-11C-40705, filed 2/1/13, effective 7/1/13.

Wash. Admin. Code § 51-11C-407051 Reserved.

History

• Statutory Authority: RCW 19.27A.020, 19.27A.025, 19.27A.160 and chapters 19.27A and 19.27 RCW. WSR 22-14-091, 23-12-101, and 23-20-021, § 51-11C-407051, filed 7/1/22, 6/7/23, and 9/25/23, effective 3/15/24. Statutory Authority: RCW 19.27A.020, 19.27A.025, 19.27A.160 and chapter 19.27 RCW. WSR 19-24-040, § 51-11C-407051, filed 11/26/19, effective 7/1/20. Statutory Authority: RCW 19.27A.025, 19.27A.045, 19.27A.160, and 19.27.074. WSR 16-24-070, § 51-11C-407051, filed 12/6/16, effective 5/1/17
• WSR 16-13-089, § 51-11C-407051, filed 6/15/16, effective 7/16/16. Statutory Authority: RCW 19.27A.025, 19.27A.160, and 19.27.074. WSR 16-03-072, § 51-11C-407051, filed 1/19/16, effective 7/1/16. Statutory Authority: RCW 19.27A.020, 19.27A.025 and chapters 19.27 and 34.05 RCW. WSR 13-04-056, § 51-11C-407051, filed 2/1/13, effective 7/1/13.

Wash. Admin. Code § 51-11C-407052 Reserved.

History

• Statutory Authority: RCW 19.27A.020, 19.27A.025, 19.27A.160 and chapter 19.27 RCW. WSR 19-24-040, § 51-11C-407052, filed 11/26/19, effective 7/1/20. Statutory Authority: RCW 19.27A.025, 19.27A.045, 19.27A.160, and 19.27.074. WSR 16-24-070, § 51-11C-407052, filed 12/6/16, effective 5/1/17. Statutory Authority: RCW 19.27A.025, 19.27A.160, and 19.27.074. WSR 16-03-072, § 51-11C-407052, filed 1/19/16, effective 7/1/16. Statutory Authority: RCW 19.27A.025, 19.27A.045, 19.27.020, and 19.27.074. WSR 14-24-122, § 51-11C-407052, filed 12/3/14, effective 1/3/15. Statutory Authority: RCW 19.27A.020, 19.27A.025 and chapters 19.27 and 34.05 RCW. WSR 13-04-056, § 51-11C-407052, filed 2/1/13, effective 7/1/13.

Wash. Admin. Code § 51-11C-407053 Reserved.

History

• Statutory Authority: RCW 19.27A.020, 19.27A.025, 19.27A.160 and chapter 19.27 RCW. WSR 19-24-040, § 51-11C-407053, filed 11/26/19, effective 7/1/20. Statutory Authority: RCW 19.27A.025, 19.27A.160, and 19.27.074. WSR 16-03-072, § 51-11C-407053, filed 1/19/16, effective 7/1/16. Statutory Authority: RCW 19.27A.020, 19.27A.025 and chapters 19.27 and 34.05 RCW. WSR 13-04-056, § 51-11C-407053, filed 2/1/13, effective 7/1/13.

Wash. Admin. Code § 51-11C-407054 Reserved.

History

• Statutory Authority: RCW 19.27A.020, 19.27A.025, 19.27A.160 and chapter 19.27 RCW. WSR 19-24-040, § 51-11C-407054, filed 11/26/19, effective 7/1/20. Statutory Authority: RCW 19.27A.025, 19.27A.160, and 19.27.074. WSR 16-03-072, § 51-11C-407054, filed 1/19/16, effective 7/1/16. Statutory Authority: RCW 19.27A.020, 19.27A.025 and chapters 19.27 and 34.05 RCW. WSR 13-04-056, § 51-11C-407054, filed 2/1/13, effective 7/1/13.

Wash. Admin. Code § 51-11C-407055 Reserved.

History

• Statutory Authority: RCW 19.27A.020, 19.27A.025, 19.27A.160 and chapter 19.27 RCW. WSR 19-24-040, § 51-11C-407055, filed 11/26/19, effective 7/1/20. Statutory Authority: RCW 19.27A.025, 19.27A.160, and 19.27.074. WSR 16-03-072, § 51-11C-407055, filed 1/19/16, effective 7/1/16. Statutory Authority: RCW 19.27A.020, 19.27A.025 and chapters 19.27 and 34.05 RCW. WSR 13-04-056, § 51-11C-407055, filed 2/1/13, effective 7/1/13.

Wash. Admin. Code § 51-11C-40706 Section C407.6—Reserved.

History

• Statutory Authority: RCW 19.27A.020, 19.27A.025, 19.27A.160 and chapter 19.27 RCW. WSR 19-24-040, § 51-11C-40706, filed 11/26/19, effective 7/1/20. Statutory Authority: RCW 19.27A.025, 19.27A.160, and 19.27.074. WSR 16-03-072, § 51-11C-40706, filed 1/19/16, effective 7/1/16. Statutory Authority: RCW 19.27A.020, 19.27A.025 and chapters 19.27 and 34.05 RCW. WSR 13-04-056, § 51-11C-40706, filed 2/1/13, effective 7/1/13.

Wash. Admin. Code § 51-11C-40800 Section C408—System commissioning.

History

• Statutory Authority: RCW 19.27A.020, 19.27A.025 and chapters 19.27 and 34.05 RCW. WSR 13-04-056, § 51-11C-40800, filed 2/1/13, effective 7/1/13.

Wash. Admin. Code § 51-11C-40801 Section C408.1—General.

C408.1 General. A building commissioning process led by a certified commissioning professional and functional testing requirements shall be completed for mechanical systems in Section C403; service water heating systems in Section C404; controlled receptacle and lighting control systems in Section C405; equipment, appliances and systems installed to comply with Sections C406 or C407; energy metering in Section C409; and refrigeration systems in Section C410.

| EXCEPTION: | Buildings, or portions thereof, which are exempt from Sections C408.2 through C408.7 may be excluded from the commissioning process. | | --- | --- | | | 1. Mechanical systems that are not required to comply with Section C403.3.5 are exempt from the commissioning process where the installed total mechanical equipment capacity is less than 180,000 Btu/h (15 tons) cooling capacity and less than 240,000 Btu/h (20 tons) heating capacity and energy recovery ventilation (ERV) equipment is less than 300 cfm capacity. | | | 2. Service water heating systems are exempt from the commissioning process in buildings where the largest service water heating system capacity is less than 200,000 Btu/h and where there are any of the following: | | | 2.1. No pools or permanent spas. | | | 2.2. No solar thermal water heating. | | | 2.3. No recirculation pumps. | | | 2.4. No heat pump water heaters, except fully-packaged for individual residential dwelling unit use. | | | 3. Lighting control systems are exempt from the commissioning process in buildings where both the total installed lighting load is less than 10 kW and the lighting load controlled by occupancy sensors or automatic daylighting controls is less than 5 kW. | | | 4. Refrigeration systems are exempt from the commissioning process in buildings if they are limited to self-contained units. |

C408.1.1 Commissioning in construction documents. Construction documents shall clearly indicate provisions for commissioning process. The construction documents shall minimally include the following:

1. A narrative description of the activities that will be accomplished during the commissioning process. At a minimum, the commissioning process is required to include:

1.1. Development and execution of the commissioning plan, including all subsections of Section C408.1.2;

1.2. The certified commissioning professional's review of the building documentation and close out submittals in accordance with Section C103.6; and

1.3. The commissioning report in accordance with Section C408.1.3.

2. Roles, responsibilities, and required qualifications of the certified commissioning professional.

3. A listing of the specific equipment, appliances, or systems to be tested.

C408.1.2 Commissioning plan. A commissioning plan shall be developed by the project's certified commissioning professional and shall outline the organization, schedule, allocation of resources, and documentation requirements of the commissioning process.

1. A narrative description of the activities that will be accomplished during each phase of commissioning, including the personnel intended to accomplish each of the activities, systems testing and balancing, functional performance testing, and verification of the building documentation requirements in Section C103.6.

2. Roles and responsibilities of the commissioning team, including the name and statement of qualifications of the certifiedcommissioning professional.

3. A listing of the specific equipment, appliances or systems to be tested and a description of the tests to be performed.

C408.1.2.1 In-house commissioning disclosure and conflict management plan. Where the certified commissioning professional's contract or employment is other than directly with the building owner, an in-house commissioning disclosure and conflict management plan shall be a part of the commissioning process. A copy shall be included in the commissioning plan. This plan shall disclose the certified commissioning professional's contractual relationship with other team members and provide a conflict management plan demonstrating that the certified commissioning professional is free to identify any issues discovered and report directly to the owner.

C408.1.2.2 Functional performance testing. Functional performance testing shall be conducted for mechanical systems in Sections C403; service water heating systems in Section C404; controlled receptacles and lighting control systems in Section C405; equipment, appliances, systems installed to comply with Section C406 or C407; energy metering in Section C409; and refrigeration systems in Section C410. Written procedures which clearly describe the individual systematic test procedures, the expected system response or acceptance criteria for each procedure, the actual response or findings, and any pertinent discussion shall be followed. This testing shall include control systems which will be tested to document that control devices, components, equipment, and systems are calibrated and adjusted to operate in accordance with approved construction documents. Testing shall affirm the conditions required within Sections C408.2 through C408.7 under system testing.

C408.1.2.3 Functional performance testing - Sampling. For projects with 7 or fewer similar systems, each system shall be tested. For projects with more than 7 systems, testing shall be done for each unique combination of control types. Where multiples of each unique combination of control types exist, no fewer than 20 percent of each combination shall be tested unless the code official or design professional requires a higher percentage to be tested. Where 30 percent or more of the tested system fail, all remaining identical combinations shall be tested.

C408.1.2.4 Deficiencies. Deficiencies found during testing shall be resolved including corrections and retesting.

C408.1.3 Commissioning report. A commissioning report shall be completed and certified by the certified commissioning professional and delivered to the building owner or owner's authorized agent. The report shall be organized with mechanical, service water heating, controlled receptacle and lighting control systems, energy metering, and refrigeration findings in separate sections to allow independent review. The report shall record the activities and results of the commissioning process and be developed from the final commissioning plan with all of its attached appendices. The report shall include:

1. Results of functional performance tests.

2. Disposition of deficiencies found during testing, including details of corrective measures used or proposed.

3. Functional performance test procedures used during the commissioning process including measurable criteria for test acceptance, provided herein for repeatability.

4. Commissioning plan.

5. Testing, adjusting and balancing report.

| EXCEPTION: | Deferred tests which cannot be performed at the time of report preparation due to climatic conditions. | | --- | --- |

C408.1.4. Commissioning process completion requirements. Prior to the final mechanical, plumbing and electrical inspections or obtaining a certificate of occupancy, the certified commissioning professional shall provide evidence of building commissioning in accordance with the provisions of this section.

C408.1.4.1 Commissioning compliance. Buildings, or portions thereof, shall not be considered acceptable for a final inspection pursuant to Section C104.2.6 until the code official has received a letter of transmittal from the building owner acknowledging that the building owner or owner's authorized agent has received the Commissioning Report. Completion of Commissioning Compliance Checklist (Figure C408.1.4.1) is deemed to satisfy this requirement. Phased acceptance of Commissioning Compliance Checklist for portions of the work specific to the trade that is being inspected is permissible where accepted by the code official and where the certified commissioning professional remains responsible for completion of the commissioning process. If there are unresolved deficiencies when the final inspection is scheduled, the Commissioning Report shall be submitted and shall describe the unresolved deficiencies.

C408.1.4.2 Copy of report. The code official shall be permitted to require that a copy of the Commissioning Report be made available for review by the code official.

History

• Statutory Authority: RCW 19.27A.020, 19.27A.025, 19.27A.160 and chapters 19.27A and 19.27 RCW. WSR 22-14-091, 23-12-101, and 23-20-021, § 51-11C-40801, filed 7/1/22, 6/7/23, and 9/25/23, effective 3/15/24. Statutory Authority: RCW 19.27A.025, 19.27A.045 and chapter 19.27 RCW. WSR 20-21-080, § 51-11C-40801, filed 10/19/20, effective 2/1/21. Statutory Authority: RCW 19.27A.020, 19.27A.025, 19.27A.160 and chapter 19.27 RCW. WSR 19-24-040, § 51-11C-40801, filed 11/26/19, effective 7/1/20. Statutory Authority: RCW 19.27A.025, 19.27A.045, 19.27A.160, and 19.27.074. WSR 16-24-070, § 51-11C-40801, filed 12/6/16, effective 5/1/17
• WSR 16-13-089, § 51-11C-40801, filed 6/15/16, effective 7/16/16. Statutory Authority: RCW 19.27A.025, 19.27A.160, and 19.27.074. WSR 16-03-072, § 51-11C-40801, filed 1/19/16, effective 7/1/16. Statutory Authority: RCW 19.27A.020, 19.27A.025 and chapters 19.27 and 34.05 RCW. WSR 13-04-056, § 51-11C-40801, filed 2/1/13, effective 7/1/13.

Wash. Admin. Code § 51-11C-408012 Figure C408.1.4.1—Commissioning compliance checklist.

Figure C408.1.4.1

Commissioning Compliance Checklist

| | Project Name: | | | | | --- | --- | --- | --- | --- | | Project Information | Project Address: | | | | | | Certified Commissioning Professional: | | | | | | Type of ISO Certification and Number: | | | | | Supporting Documents | □ | Manuals, record documents and training have been completed or are scheduled (Section C103.6) | | | | | | • | Building operations and maintenance information (C103.6.2) have been submitted to the owner or scheduled date: | | | | | • | Manuals (C103.6.2.1) have been submitted to the owner or scheduled date: | | | | | • | Compliance documentation (C103.6.3) has been provided to the owner or scheduled date: | | | | | • | System operation training (C103.6.4) has been provided to the owner or scheduled date: | | | Commissioning Plan | □ | Commissioning Plan was used during construction (Section C408.1.2) | | | | Commissioning Report | □ | Commissioning Report has been submitted (Section C408.1.3) | | | | Commissioned Systems | □ | Mechanical Systems were included in the commissioning process (Section C408.2) | | | | | | □ | Testing, adjusting and balancing is complete (Section C408.2.2). | | | | | □ | There are unresolved deficiencies with the mechanical systems. These are described in the attached Commissioning Report submitted to the owner. | | | | □ | Service Water Heating Systems were included in the commissioning process (Section C408.3) | | | | | | □ | There are unresolved deficiencies with the service water heating systems. These are described in the attached Commissioning Report submitted to the owner. | | | | □ | Controlled receptacles and lighting control systems were included in the commissioning process (Section C408.4) | | | | | | □ | There are unresolved deficiencies with the electrical power and/or automatic lighting controls. These are described in the attached Commissioning Report submitted to the owner. | | | | □ | Additional Systems included in the commissioning process (Section C408.5) | | | | | | □ | There are unresolved deficiencies with systems required by Section C406 or Section C407. These are described in the attached Commissioning Report submitted to the owner. | | | | □ | Metering Systems were included in the commissioning process (Section C408.6) | | | | | | □ | There are unresolved deficiencies with the metering system. These are described in the attached Commissioning Report submitted to the owner. | | | | □ | Refrigeration Systems were included in the commissioning process (Section C408.7) | | | | | | □ | There are unresolved deficiencies with the systems required by Section C410. These are described in the attached Commissioning Report submitted to the owner. | | | Certification | □ | I hereby certify that all requirements for Section C408 System Commissioning have been completed in accordance with the Washington State Energy Code, including all items above. | | | | | | | | | | | | | Certified Commissioning Professional | Date | | | □ | I hereby certify that all requirements for Section C408 System Commissioning have been completed in accordance with the Washington State Energy Code, including all items above. | | | | | | | | | | | | | Building Owner or Owner's Authorized Agent | Date |

History

• Statutory Authority: RCW 19.27A.020, 19.27A.025, 19.27A.160 and chapter 19.27 RCW. WSR 19-24-040, § 51-11C-408012, filed 11/26/19, effective 7/1/20. Statutory Authority: RCW 19.27A.025, 19.27A.160, and 19.27.074. WSR 16-03-072, § 51-11C-408012, filed 1/19/16, effective 7/1/16. Statutory Authority: RCW 19.27A.020, 19.27A.025 and chapters 19.27 and 34.05 RCW. WSR 13-04-056, § 51-11C-408012, filed 2/1/13, effective 7/1/13.

Wash. Admin. Code § 51-11C-40802 Section C408.2—Mechanical systems commissioning.

C408.2 Mechanical systems commissioning. Mechanical equipment and controls subject to Section C403 shall be included in the commissioning process required by Section C408.1. The commissioning process shall minimally include all energy code requirements for which the code states that equipment or controls shall "be capable of" or "configured to" perform specific functions.

| EXCEPTION: | Mechanical systems are exempt from the commissioning process where the installed total mechanical equipment capacity is less than 240,000 Btu/h cooling capacity and less than 300,000 Btu/h heating capacity. | | --- | --- |

C408.2.1 Reserved.

C408.2.2 Systems adjusting and balancing. HVAC systems shall be balanced in accordance with generally accepted engineering standards. Air and water flow rates shall be measured and adjusted to deliver final flow rates within the tolerances provided in the project specifications. Test and balance activities shall include air system and hydronic system balancing.

C408.2.2.1 Air systems balancing. Each supply air outlet and zone terminal device shall be equipped with means for air balancing in accordance with the requirements of Chapter 6 of the International Mechanical Code. Discharge dampers used for air system balancing are prohibited on constant volume fans and variable volume fans with motors 10 hp (18.6 kW) and larger. Air systems shall be balanced in a manner to first minimize throttling losses then, for fans with system power of greater than 1 hp (0.74 kW), fan speed shall be adjusted to meet design flow conditions.

| EXCEPTION: | Fans with fan motors of 1 hp (0.74 kW) or less. | | --- | --- |

C408.2.2.2 Hydronic systems balancing. Individual hydronic heating and cooling coils shall be equipped with means for balancing and measuring flow. Hydronic systems shall be proportionately balanced in a manner to first minimize throttling losses, then the pump impeller shall be trimmed or pump speed shall be adjusted to meet design flow conditions. Each hydronic system shall have either the capability to measure pressure across the pump, or test ports at each side of each pump.

| EXCEPTION: | The following equipment is not required to be equipped with means for balancing or measuring flow: | | --- | --- | | | 1. Pumps with pump motors of 5 hp (3.7 kW) or less. | | | 2. Where throttling results in no greater than five percent of the nameplate horsepower draw above that required if the impeller were trimmed. |

C408.2.3 System testing. Functional performance testing shall demonstrate the components, systems, and system-to-system interfacing relationships are installed and operate in accordance with approved construction documents. Testing shall include the sequence of operation, and be conducted under full-load, part-load and the following conditions:

1. All modes as described in the sequence of operation;

2. Redundant or automatic back-up mode;

3. Performance of alarms; and

4. Mode of operation upon a loss of power and restoration of power.

History

• Statutory Authority: RCW 19.27A.025, 19.27A.045 and chapter 19.27 RCW. WSR 20-21-080, § 51-11C-40802, filed 10/19/20, effective 2/1/21. Statutory Authority: RCW 19.27A.020, 19.27A.025, 19.27A.160 and chapter 19.27 RCW. WSR 19-24-040, § 51-11C-40802, filed 11/26/19, effective 7/1/20. Statutory Authority: RCW 19.27A.025, 19.27A.045, 19.27A.160, and 19.27.074. WSR 16-24-070, § 51-11C-40802, filed 12/6/16, effective 5/1/17. Statutory Authority: RCW 19.27A.025, 19.27A.160, and 19.27.074. WSR 16-03-072, § 51-11C-40802, filed 1/19/16, effective 7/1/16. Statutory Authority: RCW 19.27A.020, 19.27A.025 and chapters 19.27 and 34.05 RCW. WSR 13-04-056, § 51-11C-40802, filed 2/1/13, effective 7/1/13.

Wash. Admin. Code § 51-11C-40803 Section C408.3—Service water heating systems commissioning.

C408.3 Service water heating systems commissioning. Service water heating equipment and controls subject to Section C404 shall be included in the commissioning process required by Section C408.1. The commissioning process shall minimally include equipment and components installed to meet all energy code requirements for devices to "start," "automatically turn off," "automatically adjust," "limit operation," and "limit the temperature" and "be configured to."

C408.3.1 System testing. Functional performance testing shall demonstrate that heaters, piping, distribution systems, and system-to-system interfacing relationships are installed and operate in accordance with approved construction documents. Testing shall include the sequence of operation, and be conducted under at least 50 percent water heating load, part-load and the following conditions:

1. Normal operation;

2. Redundant or automatic back-up mode;

3. Performance of alarms; and

4. Mode of operation upon a loss of power and restoration of power.

History

• Statutory Authority: RCW 19.27A.020, 19.27A.025, 19.27A.160 and chapter 19.27 RCW. WSR 19-24-040, § 51-11C-40803, filed 11/26/19, effective 7/1/20. Statutory Authority: RCW 19.27A.025, 19.27A.160, and 19.27.074. WSR 16-03-072, § 51-11C-40803, filed 1/19/16, effective 7/1/16. Statutory Authority: RCW 19.27A.025, 19.27A.045, and 19.27.074. WSR 13-23-096, § 51-11C-40803, filed 11/20/13, effective 4/1/14. Statutory Authority: RCW 19.27A.020, 19.27A.025 and chapters 19.27 and 34.05 RCW. WSR 13-04-056, § 51-11C-40803, filed 2/1/13, effective 7/1/13.

Wash. Admin. Code § 51-11C-40804 Section C408.4—Controlled receptacle and lighting control system commissioning.

C408.4 Controlled receptacle and lighting control system commissioning. Controlled receptacles and lighting control systems subject to Section C405 shall be included in the commissioning process required by Section C408.1. The configuration and function of controlled receptacles and lighting control systems required by this code shall be tested and shall comply with Section C408.4.1.

| EXCEPTION: | Lighting control systems are exempt from the commissioning process in buildings where: | | --- | --- | | | 1. The total installed lighting load is less than 20 kW; and | | | 2. The lighting load controlled by occupancy sensors or automatic daylighting controls is less than 10 kW. |

C408.4.1 System testing. Functional performance testing shall demonstrate that occupant sensors, time switches, manual overrides, night sweep-off, daylight responsive control, and controlled receptacles are installed and operate in accordance with approved construction documents. Testing shall include the sequence of operation and be conducted under the following conditions:

1. Normal operation;

2. Redundant or automatic back-up mode;

3. Performance of alarms; and

4. Mode of operation upon a loss of power and restoration of power.

History

• Statutory Authority: RCW 19.27A.020, 19.27A.025, 19.27A.160 and chapter 19.27 RCW. WSR 19-24-040, § 51-11C-40804, filed 11/26/19, effective 7/1/20. Statutory Authority: RCW 19.27A.025, 19.27A.045, 19.27A.160, and 19.27.074. WSR 16-13-089, § 51-11C-40804, filed 6/15/16, effective 7/16/16. Statutory Authority: RCW 19.27A.025, 19.27A.160, and 19.27.074. WSR 16-03-072, § 51-11C-40804, filed 1/19/16, effective 7/1/16. Statutory Authority: RCW 19.27A.020, 19.27A.025 and chapters 19.27 and 34.05 RCW. WSR 13-04-056, § 51-11C-40804, filed 2/1/13, effective 7/1/13.

Wash. Admin. Code § 51-11C-408045 Section C408.5—Other systems commissioning.

C408.5 Systems installed to meet Section C406 or C407. Equipment, components, controls or configuration settings for systems which are included in the project to comply with Section C406 or C407 shall be included in the commissioning process required by Section C408.1.

C408.5.1 System testing. Functional performance testing for these appliances, equipment, components, controls and/or configuration settings shall demonstrate operation, function and maintenance serviceability for each of the commissioned systems in accordance with the approved construction documents.

History

• Statutory Authority: RCW 19.27A.020, 19.27A.025, 19.27A.160 and chapter 19.27 RCW. WSR 19-24-040, § 51-11C-408045, filed 11/26/19, effective 7/1/20. Statutory Authority: RCW 19.27A.025, 19.27A.160, and 19.27.074. WSR 16-03-072, § 51-11C-408045, filed 1/19/16, effective 7/1/16.

Wash. Admin. Code § 51-11C-40805 Section C408.6—Metering system commissioning.

C408.6 Metering system commissioning. Energy metering systems required by Section C409 shall comply with Section C408.6 and be included in the commissioning process required by Section C408.1. The commissioning process shall include all energy metering equipment and controls required by Section C409.

C408.6.1 System testing. Functional performance testing shall demonstrate that energy source meters, end-use meters, data acquisition systems, and energy displays are installed and operate in accordance with approved construction documents. At a minimum, testing shall confirm that:

1. The metering system devices and components work properly under low and high load conditions.

2. The metered data is delivered in a format that is compatible with the data collection system.

3. The energy display is in a location with access to building operation and management personnel.

4. The energy display meets code requirements regarding views required in Section C409.4.3. The display shows energy data in identical units (e.g., kWh).

History

• Statutory Authority: RCW 19.27A.020, 19.27A.025, 19.27A.160 and chapter 19.27 RCW. WSR 19-24-040, § 51-11C-40805, filed 11/26/19, effective 7/1/20. Statutory Authority: RCW 19.27A.025, 19.27A.160, and 19.27.074. WSR 16-03-072, § 51-11C-40805, filed 1/19/16, effective 7/1/16. Statutory Authority: RCW 19.27A.020, 19.27A.025 and chapters 19.27 and 34.05 RCW. WSR 13-04-056, § 51-11C-40805, filed 2/1/13, effective 7/1/13.

Wash. Admin. Code § 51-11C-40807 Section C408.7—Refrigeration system commissioning.

C408.7 Refrigeration system commissioning. All installed refrigeration systems subject to Section C410 shall be included in the commissioning process required by Section C408.1.

| EXCEPTIONS: | 1. Self-contained refrigeration systems are exempt from the commissioning process. | | --- | --- | | | 2.Total installed capacity for refrigeration is equal to or less than 240 kBtu/h. |

C408.7.1 System testing. Functional performance testing shall demonstrate that compressors, heat exchangers, piping, distribution systems, and system-to-system interfacing relationships are installed and operate in accordance with approved construction documents. Testing shall include the sequence of operation and be conducted under full-load at, part-load and the following conditions:

1. Normal mode;

2. Redundant or automatic back-up mode;

3. Performance of alarms; and

4. Mode of operation upon a loss of power and restoration of power.

History

• Statutory Authority: RCW 19.27A.020, 19.27A.025, 19.27A.160 and chapter 19.27 RCW. WSR 19-24-040, § 51-11C-40807, filed 11/26/19, effective 7/1/20.

Wash. Admin. Code § 51-11C-40900 Section C409—Energy metering and energy consumption management.

History

• Statutory Authority: RCW 19.27A.020, 19.27A.025 and chapters 19.27 and 34.05 RCW. WSR 13-04-056, § 51-11C-40900, filed 2/1/13, effective 7/1/13.

Wash. Admin. Code § 51-11C-40901 Section C409.1—General.

C409.1 General. All new buildings and additions shall have the capability of metering all source energy usage in accordance with Section C409.2 in addition to the source energy for on-site renewable energy production in accordance with Section C409.2.4 and the end-use energy usage for electric vehicle charging in accordance with Section C409.3.4. New buildings and additions with a gross conditioned floor area over 25,000 square feet shall comply with Sections C409.2, C409.3, and C409.4. New buildings and additions shall be equipped to measure, monitor, record and display energy consumption data for each energy source and end use category per the provisions of this section, to enable effective energy management. Existing buildings shall comply with the energy metering provisions of Section C506.1.

| EXCEPTIONS: | 1. Tenant spaces smaller than 25,000 square feet within buildings if the tenant space has its own utility service and utility meters shall comply with Section C409.2 and are exempt from the end-use metering, measurement devices, data acquisition system and energy display requirements of Sections C409.3 and C409.4. | | --- | --- | | | 2. Buildings in which there is no gross conditioned floor area over 25,000 square feet, including building common area, that is served by its own utility services and meters shall comply with Section C409.2 and are exempt from the end-use metering, measurement devices, data acquisition system and energy display requirements of Sections C409.3 and C409.4. |

C409.1.1 Alternate metering methods. Where approved by the building official, energy use metering systems may differ from those required by this section, provided that they are permanently installed and that the source energy measurement, end use category energy measurement, data storage and data display have similar accuracy to and are at least as effective in communicating actionable energy use information to the building management and users, as those required by this section.

C409.1.2 Conversion factor. Any threshold stated in kW shall include the equivalent BTU/h heating and cooling capacity of installed equipment at a conversion factor of 3,412 Btu per kW or 2,730 Btu per kVA.

C409.1.3 Dwelling units. See Sections C404.9 and C405.7 for additional metering requirements for Group R-2 dwelling units.

History

• Statutory Authority: RCW 19.27A.020, 19.27A.025, 19.27A.160 and chapters 19.27A and 19.27 RCW. WSR 22-14-091, 23-12-101, and 23-20-021, § 51-11C-40901, filed 7/1/22, 6/7/23, and 9/25/23, effective 3/15/24. Statutory Authority: RCW 19.27A.020, 19.27A.025, 19.27A.160 and chapter 19.27 RCW. WSR 19-24-040, § 51-11C-40901, filed 11/26/19, effective 7/1/20. Statutory Authority: RCW 19.27A.025, 19.27A.160, and 19.27.074. WSR 16-03-072, § 51-11C-40901, filed 1/19/16, effective 7/1/16. Statutory Authority: RCW 19.27A.020, 19.27A.025 and chapters 19.27 and 34.05 RCW. WSR 13-04-056, § 51-11C-40901, filed 2/1/13, effective 7/1/13.

Wash. Admin. Code § 51-11C-40902 Section C409.2—Energy source metering.

C409.2 Energy source metering. Buildings shall have a meter at each energy source. For each energy supply source listed in Section C409.2.1 through C409.2.4, meters shall collect data for the whole building or for each separately metered portion of the building where not exempted by the exception to Section C409.1.

| EXCEPTIONS: | 1. Energy source metering is not required where end use metering for an energy source accounts for all usage of that energy type within a building, and the data acquisition system accurately totals the energy delivered to the building or separately metered portion of the building. | | --- | --- | | | 2. Solid fuels such as coal, firewood or wood pellets that are delivered via mobile transportation do not require metering. |

C409.2.1 Electrical energy. This category shall include all electrical energy supplied to the building and its associated site, including site lighting, parking, recreational facilities, and other areas that serve the building and its occupants.

C409.2.2 Gas and liquid fuel supply energy. This category shall include all natural gas, fuel oil, propane and other gas or liquid fuel energy supplied to the building and site.

C409.2.3 District energy. This category shall include all net energy extracted from district steam systems, district chilled water loops, district hot water systems, or other energy sources serving multiple buildings.

C409.2.4 Site-generated renewable energy. This category shall include all net energy generated from on-site solar, wind, geothermal, tidal or other natural sources. For buildings exempt from data collection systems, the data from these meters is permitted to either be stored locally using a manual totalizing meter or other means at the meter or fed into a central data collection system.

History

• Statutory Authority: RCW 19.27A.020, 19.27A.025, 19.27A.160 and chapter 19.27 RCW. WSR 19-24-040, § 51-11C-40902, filed 11/26/19, effective 7/1/20. Statutory Authority: RCW 19.27A.020, 19.27A.025 and chapters 19.27 and 34.05 RCW. WSR 13-04-056, § 51-11C-40902, filed 2/1/13, effective 7/1/13.

Wash. Admin. Code § 51-11C-40903 Section C409.3—End-use metering.

C409.3 End-use metering. Meters shall be provided to collect energy use data for each end-use category listed in Sections C409.3.1 through C409.3.7. These meters shall collect data for the whole building or for each separately metered portion of the building where not exempted by the exception to Section C409.1. Not more than 10 percent of the total connected load of any of the end-use metering categories in Sections C409.3.1 through C409.3.6 is permitted to be excluded from that end-use data collection. Not more than 10 percent of the total connected load of any of the end-use metering categories in Sections C409.3.1 through C409.3.6 is permitted to consist of loads not part of that category. Multiple meters may be used for any end-use category, provided that the data acquisition system totals all of the energy used by that category. Full-floor tenant space submetering data shall be provided to the tenant in accordance with Section C409.7, and the data shall not be required to be included in other end-use categories.

| EXCEPTIONS: | 1. HVAC and service water heating equipment serving only an individual dwelling unit or sleeping unit does not require end-use metering. | | --- | --- | | | 2. Separate metering is not required for fire pumps, stairwell pressurization fans or other life safety systems that operate only during testing or emergency. | | | 3. End use metering is not required for individual tenant spaces not exceeding 2,500 square feet in floor area when a dedicated source meter meeting the requirements of Section C409.4.1 is provided for the tenant space. | | | 4. Health care facilities with loads in excess of 150 kVA are permitted to have submetering that measures electrical energy usage in accordance with the normal and essential electrical systems except that submetering is required for the following load categories: | | | 4.1. HVAC system energy use in accordance with the requirements of Section C409.3.1. | | | 4.2. Service water heating energy use in accordance with the requirements of Section C409.3.2. | | | 4.3. Process load system energy in accordance with the requirements of Section C409.3.6 for each significant facility not used in direct patient care including, but not limited to, food service, laundry and sterile processing facilities, where the total connected load of the facility exceeds 100 kVA. | | | 5. End-use metering is not required for electrical circuits serving only sleeping rooms and guest suites within Group R-1 occupancies. This exception does not apply to common areas or to equipment serving multiple sleeping rooms. |

C409.3.1 HVAC system energy use. This category shall include all energy including electrical, gas, liquid fuel, district steam and district chilled water that is used by boilers, chillers, pumps, fans and other equipment used to provide space heating, space cooling, dehumidification and ventilation to the building, but not including energy that serves process loads, service water heating or miscellaneous loads as defined in Section C409.3. Multiple HVAC energy sources, such as gas, electric and steam, are not required to be summed together.

| EXCEPTIONS: | 1. 120 volt equipment. | | --- | --- | | | 2. An HVAC branch circuit where the total MCA of equipment served equates to less than 10 kVA. | | | 3. Individual fans or pumps that are not on a variable frequency drive. |

C409.3.2 Service water heating energy use. This category shall include all energy used for heating of domestic and service hot water, but not energy used for space heating.

| EXCEPTION: | Service water heating energy use less than 50 kVA does not require end-use metering. | | --- | --- |

C409.3.3 Lighting system energy use. This category shall include all energy used by interior and exterior lighting, including lighting in parking structures and lots, but not including plug-in task lighting.

C409.3.4 Electric vehicle charging energy use. This category shall include all energy used for electric vehicle charging. For buildings exempt from data collection systems, the data from these meters is permitted to either be stored locally using a manual totalizing meter or other means at the meter or fed into a central data collection system.

C409.3.5 Plug load system energy use. This category shall include all energy used by appliances, computers, plug-in task lighting, and other equipment or equipment covered by other end-use metering categories listed in Section C409.3. In a building where the main service is 480/277 volt, each 208/120 volt panel is permitted to be assumed to serve only plug load for the purpose of Section C409, unless it serves nonresidential refrigeration or cooking equipment.

| EXCEPTION: | Where the total connected load of all plug load circuits is less than 50 kVA, end-use metering is not required. | | --- | --- |

C409.3.6 Process load system energy use. This category shall include all energy used by any nonbuilding process load including, but not limited to, nonresidential refrigeration and cooking equipment, laundry equipment, industrial equipment, and stage lighting.

| EXCEPTION: | Where the process load energy use is less than 50 kVA end-use metering is not required. | | --- | --- |

C409.3.7 Full-floor tenant space electrical submetering. In a multitenant building where more than 90 percent of the leasable area of a floor is occupied by a single tenant, an electrical energy use display shall be provided to the tenant in accordance with the requirements of Section C409.4.3. Electrical loads from areas outside of the tenant space or from equipment that serves areas outside the tenant space shall not be included in the tenant space submetering. A single display is permitted to serve multiple floors occupied by the same tenant.

History

• Statutory Authority: RCW 19.27A.045 and chapter 19.27A RCW. WSR 24-16-145, § 51-11C-40903, filed 8/7/24, effective 9/7/24. Statutory Authority: RCW 19.27A.020, 19.27A.025, 19.27A.160 and chapter 19.27 RCW. WSR 19-24-040, § 51-11C-40903, filed 11/26/19, effective 7/1/20. Statutory Authority: RCW 19.27A.025, 19.27A.160, and 19.27.074. WSR 16-03-072, § 51-11C-40903, filed 1/19/16, effective 7/1/16. Statutory Authority: RCW 19.27A.020, 19.27A.025 and chapters 19.27 and 34.05 RCW. WSR 13-04-056, § 51-11C-40903, filed 2/1/13, effective 7/1/13.

Wash. Admin. Code § 51-11C-40904 Section C409.4—Measurement devices, data acquisition system and energy display.

C409.4 Measurement devices, data acquisition system and energy display.

C409.4.1 Meters. Meters and other measurement devices required by this section shall be configured to automatically communicate energy data to a data acquisition system and energy display. Source meters may be any digital-type meters. Current sensors or flow meters are allowed for end use metering, provided that they have an accuracy of +/- 5%. All required metering systems and equipment shall provide data that is fully integrated into the data acquisition and display system per the requirements of Section C409. Electrical meters shall be configured to communicate data to the data acquisition system and energy display for both consumption (e.g., kWh) and consumption rate (e.g., kW). Other meters and measurement devices shall be configured to communicate data to the data acquisition system for consumption.

C409.4.2 Data acquisition system. The data acquisition system shall store the data from the required meters and other sensing devices in a single database for a minimum of 36 months. For each energy supply and end use category required by C409.2 and C409.3, it shall provide energy consumption logged in one-hour or less intervals and energy consumption rate logged in 10-minute or less intervals. Data from the data acquisition system shall be viewable via the energy display in accordance with the requirements of Section C409.4.3.

C409.4.3 Energy display. For each building subject to Section C409.2 and C409.3, either a single visible display in a location with ready access, or a single web page or other electronic document available for access to building operation and management personnel or to a third-party energy data analysis service shall be provided in the building; for metering data acquisition systems and energy displays monitored by a third-party energy data analysis service, building operation and management personnel shall retain access to the metering data acquisition system and energy display. The display shall numerically provide the current energy consumption rate and energy consumption total for each whole building energy source and each end use category. The energy display shall also graphically and numerically display logged data from the data acquisition system for energy consumption for each whole building energy source and energy consumption rate for whole building electrical use and each end use category for any selected day, week, month, or year.

C409.4.4 Commissioning. Energy metering and energy consumption management systems shall be commissioned in accordance with Section C408.6.

History

• Statutory Authority: RCW 19.27A.020, 19.27A.025, 19.27A.160 and chapters 19.27A and 19.27 RCW. WSR 22-14-091, 23-12-101, and 23-20-021, § 51-11C-40904, filed 7/1/22, 6/7/23, and 9/25/23, effective 3/15/24. Statutory Authority: RCW 19.27A.025, 19.27A.045 and chapter 19.27 RCW. WSR 20-21-080, § 51-11C-40904, filed 10/19/20, effective 2/1/21. Statutory Authority: RCW 19.27A.020, 19.27A.025, 19.27A.160 and chapter 19.27 RCW. WSR 19-24-040, § 51-11C-40904, filed 11/26/19, effective 7/1/20. Statutory Authority: RCW 19.27A.025, 19.27A.045, 19.27A.160, and 19.27.074. WSR 16-13-089, § 51-11C-40904, filed 6/15/16, effective 7/16/16. Statutory Authority: RCW 19.27A.020, 19.27A.025 and chapters 19.27 and 34.05 RCW. WSR 13-04-056, § 51-11C-40904, filed 2/1/13, effective 7/1/13.

Wash. Admin. Code § 51-11C-40905 Reserved.

History

• Statutory Authority: RCW 19.27A.020, 19.27A.025, 19.27A.160 and chapters 19.27A and 19.27 RCW. WSR 22-14-091, 23-12-101, and 23-20-021, § 51-11C-40905, filed 7/1/22, 6/7/23, and 9/25/23, effective 3/15/24. Statutory Authority: RCW 19.27A.025, 19.27A.160, and 19.27.074. WSR 16-03-072, § 51-11C-40905, filed 1/19/16, effective 7/1/16. Statutory Authority: RCW 19.27A.020, 19.27A.025 and chapters 19.27 and 34.05 RCW. WSR 13-04-056, § 51-11C-40905, filed 2/1/13, effective 7/1/13.

Wash. Admin. Code § 51-11C-41000 Section C410—Refrigeration system requirements.

C410.1 General. Walk-in coolers, walk-in freezers, refrigerated warehouse coolers, refrigerated warehouse freezers, and refrigerated display cases shall comply with this Section.

Table C410.2

Minimum Efficiency Requirements: Commercial Refrigerators and Freezers and Refrigeration

| Equipment Category | Condensing Unit Configuration | Equipment Family | Rating Temp. °F | Operating Temp. °F | Equipment Classificationc | Maximum Daily Energy Consumption kWh/dayd,e | Test Standard | | --- | --- | --- | --- | --- | --- | --- | --- | | Remote condensing commercial refrigerators and commercial freezers | Remote (RC) | Vertical open (VOP) | 38 (M) | ≥32 | VOP.RC.M | 0.64 × TDA + 4.07 | AHRI 1200 | | 0 (L) | <32 | VOP.RC.L | 2.20 × TDA + 6.85 | | | | | | Semivertical open (SVO) | 38 (M) | ≥32 | SVO.RC.M | 0.66 × TDA + 3.18 | | | | | 0 (L) | <32 | SVO.RC.L | 2.20 × TDA + 6.85 | | | | | | Horizontal open (HZO) | 38 (M) | ≥32 | HZO.RC.M | 0.35 × TDA + 2.88 | | | | | 0 (L) | <32 | HZO.RC.L | 0.55 × TDA + 6.88 | | | | | | Vertical closed transparent (VCT) | 38 (M) | ≥32 | VCT.RC.M | 0.15 × TDA + 1.95 | | | | | 0 (L) | <32 | VCT.RC.L | 0.49 × TDA + 2.61 | | | | | | Horizontal closed transparent (HCT) | 38 (M) | ≥32 | HCT.RC.M | 0.16 × TDA + 0.13 | | | | | 0 (L) | <32 | HCT.RC.L | 0.34 × TDA + 0.26 | | | | | | Vertical closed solid (VCS) | 38 (M) | ≥32 | VCS.RC.M | 0.10 × V + 0.26 | | | | | 0 (L) | <32 | VCS.RC.L | 0.21 × V + 0.54 | | | | | | Horizontal closed solid (HCS) | 38 (M) | ≥32 | HCS.RC.M | 0.10 × V + 0.26 | | | | | 0 (L) | <32 | HCS.RC.L | 0.21 × V + 0.54 | | | | | | Service over counter (SOC) | 38 (M) | ≥32 | SOC.RC.M | 0.44 × TDA + 0.11 | | | | | 0 (L) | <32 | SOC.RC.L | 0.93 × TDA + 0.22 | | | | | | Self-contained commercial refrigerators and commercial freezers with and without doors | Self-contained (SC) | Vertical open (VOP) | 38 (M) | ≥32 | VOP.RC.M | 1.69 × TDA + 4.71 | AHRI 1200 | | 0 (L) | <32 | VOP.RC.L | 4.25 × TDA + 11.82 | | | | | | Semivertical open (SVO) | 38 (M) | ≥32 | SVO.RC.M | 1.70 × TDA + 4.59 | | | | | 0 (L) | <32 | SVO.RC.L | 4.26 × TDA + 11.51 | | | | | | Horizontal open (HZO) | 38 (M) | ≥32 | HZO.RC.M | 0.72 × TDA + 5.55 | | | | | 0 (L) | <32 | HZO.RC.L | 1.90 × TDA + 7.08 | | | | | | Vertical closed transparent (VCT) | 38 (M) | ≥32 | VCT.RC.M | 0.10 × V + 0.86 | | | | | 0 (L) | <32 | VCT.RC.L | 0.29 × V + 2.95 | | | | | | Vertical closed solid (VCS) | 38 (M) | ≥32 | VCS.RC.M | 0.05 × V + 1.36 | | | | | 0 (L) | <32 | VCS.RC.L | 0.22 × V + 1.38 | | | | | | Self-contained commercial refrigerators and commercial freezers with and without doors | Self-contained (SC) | Horizontal closed transparent (HCT) | 38 (M) | ≥32 | HCT.RC.M | 0.06 × V + 0.37 | AHRI 1200 | | 0 (L) | <32 | HCT.RC.L | 0.08 × V + 1.23 | | | | | | Horizontal closed solid (HCS) | 38 (M) | ≥32 | HCS.RC.M | 0.05 × V + 0.91 | | | | | 0 (L) | <32 | HCS.RC.L | 0.06 × V + 1.12 | | | | | | Service over counter (SOC) | 38 (M) | ≥32 | SOC.RC.M | 0.52 × TDA + 1.00 | | | | | 0 (L) | <32 | SOC.RC.L | 1.10 × TDA + 2.10 | | | | | | Self-contained commercial refrigerators with transparent doors for pull-down temperature applications | Self-contained (SC) | Pull-down | 38(M) | ≥32 | PD.SC.M | 0.11 × V + 0.81 | AHRI 1200 | | Commercial ice cream freezers | Remote (RC) | Vertical open (VOP) | -15 (I) | ≤-5b | VOP.RC.I | 2.79 × TDA + 8.70 | AHRI 1200 | | Semivertical open (SVO) | SVO.RC.I | 2.79 × TDA + 8.70 | | | | | | | Horizontal open (HZO) | HZO.RC.I | 0.70 × TDA + 8.74 | | | | | | | Vertical closed transparent (VCT) | VCT.RC.I | 0.58 × TDA + 3.05 | | | | | | | Horizontal closed transparent (HCT) | HCT.RC.I | 0.40 × TDA + 0.31 | | | | | | | Vertical closed solid (VCS) | VCS.RC.I | 0.25 × V + 0.63 | | | | | | | Horizontal closed solid (HCS) | HCS.RC.I | 0.25 × V + 0.63 | | | | | | | Service over counter (SOC) | SOC.RC.I | 1.09 × TDA + 0.26 | | | | | | | Self-contained (SC) | Vertical open (VOP) | -15 (I) | ≤-5b | VOP.SC.I | × TDA + | AHRI 1200 | | | Semivertical open (SVO) | SVO.SC.I | × TDA + | | | | | | | Horizontal open (HZO) | HZO.SC.I | × TDA + | | | | | | | Vertical closed transparent (VCT) | VCT.SC.I | × TDA + | | | | | | | Horizontal closed transparent (HCT) | HCT.SC.I | × TDA + | | | | | | | Vertical closed solid (VCS) | VCS.SC.I | × V + | | | | | | | Horizontal closed solid (HCS) | HCS.SC.I | × V + | | | | | | | Service over counter (SOC) | SOC.SC.I | × TDA + | | | | | |

| For SI: 1 square foot = 0.0929 m2, 1 cubic foot = 0.02832 m3, °C = (°F – 32)/1.8. | | | | --- | --- | --- | | a | The meaning of the letters in this column is indicated in the columns to the left. | | | b | Ice cream freezer is defined in DOE 10 C.F.R. Part 431.62 as a commercial freezer that is designed to operate at or below -5°F and that the manufacturer designs, markets or intends for the storing, displaying, or dispensing of ice cream. | | | c | Equipment class designations consist of a combination [(in sequential order separated by periods (AAA).(BB).(C))] of: | | | | (AAA) An equipment family code where: | | | | | VOP = Vertical open | | | | SVO = Semi-vertical open | | | | HZO = Horizontal open | | | | VCT = Vertical transparent doors | | | | VCS = Vertical solid doors | | | | HCT = Horizontal transparent doors | | | | HCS = Horizontal solid doors | | | | SOC = Service over counter | | | (BB) An operating mode code: | | | | | RC = Remote condensing | | | | SC = Self-contained | | | (C) A rating temperature code: | | | | | M = Medium temperature (38°F) | | | | L = Low temperature (0°F) | | | | I = Ice cream temperature (15°F) | | | For example, "VOP.RC.M" refers to the "vertical-open, remote-condensing, medium-temperature" equipment class. | | | d | V is the volume of the case (ft3) as measured in AHRI 1200, Appendix C. | | | e | TDA is the total display area of the case (ft2) as measured in AHRI 1200, Appendix D. | |

C410.2 Commercial refrigerators, freezers and refrigerator-freezers. Refrigeration equipment, defined in DOE 10 C.F.R. Part 431.62, shall have an energy use in kWh/day not greater than the values of Table C410.2 when tested and rated in accordance with AHRI Standard 1200. The energy use shall be verified through certification under an approved certification program or, where a certification program does not exist, the energy use shall be supported by data furnished by the equipment manufacturer.

C410.2.1 Refrigerated display cases. Refrigerated display cases shall comply with the following:

1. Lighting in refrigerated display cases shall be controlled by one of the following:

1.1. Time switch controls to turn off lights during nonbusiness hours. Timed overrides for display cases shall turn the lights on for up to 1 hour and shall automatically time out to turn the lights off.

1.2. Motion sensor controls on each display case section that reduce lighting power by at least 50 percent within 3 minutes after the area within the sensor range is vacated.

2. Low-temperature display cases shall incorporate temperature-based defrost termination control with a time-limit default. The defrost cycle shall terminate first on an upper temperature limit breach and second upon a time limit breach.

3. Antisweat heater controls shall reduce the energy use of the antisweat heater as a function of the relative humidity in the air outside the door or to the condensation on the inner glass pane.

C410.3 Walk-in coolers, walk-in freezers, refrigerated warehouse coolers and refrigerated warehouse freezers. Site-assembled and site-constructed walk-in coolers and walk-in freezers and refrigerated warehouse coolers and refrigerated warehouse freezers shall comply with the following:

1. Automatic door-closers shall be provided that fully close walk-in doors that have been closed to within 1 inch (25 mm) of full closure.

| EXCEPTION: | Automatic closers are not required for doors more than 45 inches (1143 mm) in width or more than 7 feet (2134 mm) in height. | | --- | --- |

2. Doorways shall be provided with strip doors, curtains, spring-hinged doors or other method of minimizing infiltration when doors are open.

3. Walk-in coolers and refrigerated warehouse coolers shall be provided with wall, ceiling, and door insulation of not less than R-25 or have wall, ceiling and door assembly U-factors no greater than U-0.039. Walk-in freezers and refrigerated warehouse freezers shall be provided with wall, ceiling and door insulation of not less than R-32 or have wall, ceiling and door assembly U-factors no greater than U-0.030.

| EXCEPTION: | Insulation is not required for glazed portions of doors or at structural members associated with the walls, ceiling or door frame. | | --- | --- |

4. The floor of walk-in coolers shall be provided with floor insulation of not less than R-25 or have a floor assembly U-factor no greater than U-0.40. The floor of walk-in freezers shall be provided with floor insulation of not less than R-28 or have a floor assembly U-factor no greater than U-0.035.

| EXCEPTION: | Insulation is not required in the floor of a walk-in cooler that is mounted directly on a slab on grade. | | --- | --- |

5. Transparent fixed window and reach-in doors for walk-in freezers and windows in walk-in freezer doors shall be provided with triple-pane glass, with the interstitial spaces filled with inert gas or be provided with heat-reflective treated glass.

6. Transparent fixed window and reach-in doors for walk-in coolers and windows for walk-in coolers doors shall be provided with double-pane or triple-pane glass, with interstitial space filled with inert gas, or be provided with heat-reflective treated glass.

7. Evaporator fan motors that are less than 1 hp (0.746 kW) and less than 460 volts shall be provided with electronically commutated motors, brushless direct-current motors, or 3-phase motors.

8. Condenser fan motors that are less than 1 hp (0.746 kW) shall use electronically commutated motors, permanent split capacitor-type motors or 3-phase motors.

9. Antisweat heaters that are not provided with antisweat heater controls shall have a total door rail, glass and frame heater power draw of not greater than 7.1 W/ft2 (76 W/m2) of door opening for walk-in freezers and not greater than 3.0 W/ft2 (32 W/m2) of door opening for walk-in coolers.

10. Where antisweat heater controls are provided, they shall be capable of reducing the energy use of the antisweat heater as a function of the relative humidity in the air outside the door or to the condensation on the inner glass pane.

11. Lights in walk-in coolers, walk-in freezers, refrigerated warehouse coolers and refrigerated warehouse freezers shall either be provided with light sources with an efficacy of not less than 40 lumens per watt, including ballast losses, or shall be provided with a device that automatically turns off the lights within 15 minutes of when the walk-in cooler or walk-in freezer space is not occupied.

C410.3.1 Performance standards. Site-assembled and site-constructed walk-in coolers and walk-in freezers shall meet the requirements of Tables C410.3.1(1), C410.3.1(2), and C410.2.1(3).

Table C410.3.1(1)

Walk-in Cooler and Freezer Display Doors Efficiency Requirements

| Class Descriptor | Class | Maximum Energy Consumption (kWh/day)a | | --- | --- | --- | | Display door, medium temperature | DD, M | 0.04 × Add + 0.41 | | Display door, low temperature | DD, L | 0.15 × Add + 0.29 |

| a | Add is the surface area of the display door. | | --- | --- |

Table C410.3.1(2)

Walk-in Cooler and Freezer Nondisplay Doors Efficiency Requirements

| Class Descriptor | Class | Maximum Energy Consumption (kWh/day)a | | --- | --- | --- | | Passage door, medium temperature | PD, M | 0.05 × And + 1.7 | | Passage door, low temperature | PD, L | 0.14 × And + 4.8 | | Freight door, medium temperature | FD, M | 0.04 × And + 1.9 | | Freight door, low temperature | FD, L | 0.12 × And + 5.6 |

| a | And is the surface area of the nondisplay door. | | --- | --- |

Table C410.3.1(3)

Walk-in Cooler and Freezer Refrigeration Systems Efficiency Requirements

| Class Descriptor | Class | Minimum Annual Walk-in Energy Factor AWEF (Btu/hW-h) | Test Procedure | | --- | --- | --- | --- | | Dedicated condensing, medium temperature, indoor system | DC.M.I | 5.61 | AHRI 1250 | | Dedicated condensing, medium temperature, outdoor system | DC.M.O | 7.60 | AHRI 1250 | | Dedicated condensing, low temperature, indoor system, net capacity (qnet) < 6,500 Btu/h | DC.L.I, < 6,500 | 9.091 × 10-5 × qnet + 1.81 | AHRI 1250 | | Dedicated condensing, low temperature, indoor system, net capacity (qnet) ≥ 6,500 Btu/h | DC.L.I, ≥ 6,500 | 2.40 | AHRI 1250 | | Dedicated condensing, low temperature, outdoor system, net capacity (qnet) < 6,500 Btu/h | DC.L.O, < 6,500 | 6.522 × 10-5 × qnet + 2.73 | AHRI 1250 | | Dedicated condensing, low temperature, outdoor system, net capacity (qnet) ≥ 6,500 Btu/h | DC.L.O, ≥ 6,500 | 3.15 | AHRI 1250 | | Unit cooler, medium | UC.M | 9.00 | AHRI 1250 | | Unit cooler, low temperature, net capacity (qnet) < 15,500 Btu/h | UC.L, < 15,500 | 1.575 × 10-5 × qnet + 3.91 | AHRI 1250 | | Unit cooler, low temperature, net capacity (qnet) ≥ 15,500 Btu/h | UC.L, ≥ 15,500 | 4.15 | AHRI 1250 |

C410.4 Refrigerated case and walk-in display doors. Lighting in glass doors in all walk-in coolers and walk-in freezers and all refrigerated warehouse coolers and refrigerated warehouse freezers shall comply with the following:

1. Time switch controls to turn off lights during nonbusiness hours. Timed overrides for display cases shall turn the lights on for up to 1 hour and shall automatically time out to turn the lights off.

2. Motion sensor controls on each display case section that reduce lighting power by at least 50 percent within 3 minutes after the area within the sensor range is vacated.

C410.5 Refrigeration systems. Refrigerated display cases, walk-in coolers or walk-in freezers that are served by remote compressors and remote condensers not located in a condensing unit, shall comply with Sections C410.5.1, C410.5.2, and C403.9.2.3.

| EXCEPTION: | Systems where the working fluid in the refrigeration cycle goes through both subcritical and supercritical states (transcritical) or that use ammonia refrigerant are exempt. | | --- | --- |

C410.5.1 Condensers serving refrigeration systems. Fan-powered condensers shall comply with the following:

1. The design saturated condensing temperatures for air-cooled condensers shall not exceed the design dry-bulb temperature plus 10°F (5.6°C) for low-temperature refrigeration systems, and the design dry-bulb temperature plus 15°F (8°C) for medium temperature refrigeration systems where the saturated condensing temperature for blend refrigerants shall be determined using the average of liquid and vapor temperatures as converted from the condenser drain pressure.

2. Condenser fan motors that are less than 1 hp (0.75 kW) shall use electronically commutated motors, permanent split-capacitor-type motors or 3-phase motors.

3. Condenser fans for air-cooled condensers, evaporatively cooled condensers, air- or water-cooled fluid coolers or cooling towers shall reduce fan motor demand to not more than 30 percent of design wattage at 50 percent of design air volume, and incorporate one of the following continuous variable speed fan control approaches:

3.1. Refrigeration system condenser control for air-cooled condensers shall use variable setpoint control logic to reset the condensing temperature setpoint in response to ambient dry-bulb temperature.

3.2. Refrigeration system condenser control for evaporatively cooled condensers shall use variable setpoint control logic to reset the condensing temperature setpoint in response to ambient wet-bulb temperature.

4. Multiple fan condensers shall be controlled in unison.

5. The minimum condensing temperature setpoint shall be not greater than 70°F (21°C).

C410.5.2 Compressor systems. Refrigeration compressor systems shall comply with the following:

1. Compressors and multiple-compressor system suction groups shall include control systems that use floating suction pressure control logic to reset the target suction pressure temperature based on the temperature requirements of the attached refrigeration display cases or walk-ins.

| EXCEPTION: | Controls are not required for the following: | | --- | --- | | | 1. Single-compressor systems that do not have variable capacity capability. | | | 2. Suction groups that have a design saturated suction temperature of 30°F (-1.1°C) or higher, suction groups that comprise the high stage of a two-stage or cascade system, or suction groups that primarily serve chillers for secondary cooling fluids. |

2. Liquid subcooling shall be provided for all low-temperature compressor systems with a design cooling capacity equal to or greater than 100,000 Btu/hr (29.3 kW) with a design-saturated suction temperature of -10°F (-23°C) or lower. The subcooled liquid temperature shall be controlled at a maximum temperature setpoint of 50°F (10°C) at the exit of the subcooler using either compressor economizer (interstage) ports or a separate compressor suction group operating at a saturated suction temperature of 18°F (-7.8°C) or higher.

2.1. Insulation for liquid lines with a fluid operating temperature less than 60°F (15.6°C) shall comply with Table C403.2.10.

3. Compressors that incorporate internal or external crankcase heaters shall provide a means to cycle the heaters off during compressor operation.

C410.6 Commissioning. Refrigeration systems shall be commissioned in accordance with Section C408.

| EXCEPTION: | Self-contained units. | | --- | --- |

Reviser's note: The brackets and enclosed material in the text of the above section occurred in the copy filed by the agency.

Wash. Admin. Code § 51-11C-41100 Section C411—Renewable energy.

C411.1 On-site renewable energy. Each new building or addition larger than 10,000 square feet of gross conditioned floor area shall include a renewable energy generation system consisting of not less than 0.5 W/ft2 or 1.7 Btu/ft2 multiplied by the sum of the gross conditioned floor area.

| EXCEPTIONS: | 1. Any building where more than 50 percent of the roof area is shaded from direct beam sunlight by natural objects or by structures that are not part of the building for more than 2500 annual hours between 8:00 a.m. and 4:00 p.m. | | --- | --- | | | 2. Any building where more than 80 percent of the roof area is covered by any combination of equipment other than for on-site renewable energy systems, planters, vegetated space, skylights or occupied roof deck. | | | 3. Buildings which can document they do not have adequate roof area to install the required on-site solar and that comply with Section C411.1.1 may install a lesser amount of on-site renewables but not zero. |

C411.1.1 Additional efficiency credits. Buildings which qualify for one of the exceptions in Section C411.1 to omit installation of on-site renewable energy must achieve an additional 18 efficiency package credits from Table C406.2(1). The additional 18 credits can be reduced based on a prorated fraction of renewable capacity that is installed on-site.

On-site renewable energy installations of lower than required capacity can be counted proportionally toward achievement of required or additional efficiency credits in Section C411.1.1 based on the capacity of renewable energy installed compared to the requirements of Section C411.1.

C411.2 On-site and off-site renewable energy accounting. Qualifying on-site and off-site renewable energy delivered or credited to the building project to comply with this code shall meet the requirements of this section. Renewable energy certificates for an on-site or off-site renewable energy system shall be retired on behalf of the building owner for a period of not less than 15 years and tracked in accordance with Section C411.2.3 and submitted to the code official as part of the permit application.

C411.2.1 Qualifying types of off-site renewable energy systems. The following are considered qualifying off-site renewable energy systems:

1. Self-generation (an off-site renewable energy system owned by the building project owner) systems complying with Section C411.2.2.

2. Community renewable energy facility systems complying with Section C411.2.2.

3. Purchase contracts complying with Section C411.2.3.

4. Each source of renewable energy delivered to or credited to the building project shall be connected to the Western Interconnection and energy or capacity multiplied by the factors in Table C411.2.1.

Table C411.2.1

Multipliers for Renewable Energy Procurement Methods

| Location | Renewable Energy Source | Renewable Energy Factor | | | | --- | --- | --- | --- | --- | | In the state of Washington | Western Interconnected | In the states of Oregon or Idaho | | | | On-site | On-site renewable energy system | 1 | NA | NA | | Off-site | Directly owned off-site renewable energy system that begins operation after submission of the initial permit application | 0.95 | 0.75 | 0.85 | | Off-site | Community renewable energy facility that begins operation after submission of the initial permit application | 0.95 | 0.75 | 0.85 | | Off-site | Directly owned off-site renewable energy system that begins operation before submission of the initial permit application | 0.75 | 0.55 | 0.65 | | Off-site | Community renewable energy facility that begins operation before submission of the initial permit application | 0.75 | 0.55 | 0.65 | | Off-site | Renewable Power Purchase Agreement (PPA) | 0.75 | 0.55 | 0.65 |

C411.2.2 Documentation requirements for off-site renewable energy systems. Off-site renewable energy delivered or credited to the building project to comply with Section C407.3 item 2.2 shall be subject to a legally binding contract to procure qualifying off-site renewable energy. Qualifying off-site renewable energy shall meet the following requirements:

1. Documentation of off-site renewable energy procurement shall be submitted to the code official.

2. The purchase contract shall have a duration of not less than 15 years. The contract shall be structured to survive a partial or full transfer of ownership of the building property.

3. Records on renewable power purchased by the building owner from the off-site renewable energy generator that specifically assign the RECs to the building owner shall be retained or retired by the building owner on behalf of the entity demonstrating financial or operational control over the building seeking compliance to this standard and made available for inspection by the code official upon request.

4. Where multiple buildings in a building project are allocated energy procured by a contract subject to this section, the owner shall allocate for not less than 15 years the energy procured by the contract to the buildings in the building project. A plan on operation shall be developed which shall indicate how renewable energy produced from on-site or off-site systems that is not allocated before issuance of the certificate of occupancy will be allocated to new or existing buildings included in the building project.

C411.2.3 Renewable energy certificate (REC) tracking. For multitenant buildings where RECs are transferred to tenants, the plan for operation shall include procedures for tracking the quantity and vintage of RECs that are required to be retained and retired. The plan shall include provisions to transfer the RECs to building tenants, or to retire RECs on their behalf, in proportion to the gross conditioned and semi-heated floor area leased or rented. The plan shall include provisions to use a REC tracking system that meets the requirements of Section V.B of the Green-e Framework for Renewable Energy Certification. The plan shall describe how the building owner will procure alternative qualifying renewable energy in the case that the renewable energy producer ceases.

C411.3 Solar readiness. A solar zone shall be provided on buildings that are 20 stories or less in height above grade plan. The solar zone shall be located on the roof of the building or on another structure elsewhere on the site. The solar zone shall be in accordance with this section and the International Fire Code.

| EXCEPTION: | A solar zone is not required under the following conditions: | | --- | --- | | | 1. Where the solar exposure of the building's roof area is less than 75 percent of that of an unshaded area, as defined in Section C411.3.4, in the same location, as measured by one of the following: | | | 1.1. Incident solar radiation expressed in kWh/ft2-yr using typical meteorological year (TMY) data. | | | 1.2. Annual sunlight exposure expressed in cumulative hours per year using TMY data. | | | 1.3. Shadow studies indicating that the roof area is more than 25 percent in shadow, on September 21st at 10 a.m., 11 a.m., 12 p.m., 1 p.m., and 2 p.m. solar time. | | | 2. Buildings, building additions, changes in space conditioning or occupancy where the total floor area is equal to or less than 500 square feet. |

C411.3.1 Minimum area. The minimum area of the solar zone shall be determined by one of the following methods, whichever results in the smaller area:

1. Forty percent of roof area. The roof area shall be calculated as the horizontally projected gross roof area less the area covered by skylights, occupied roof decks, mechanical equipment, mechanical equipment service clearances, and planted areas.

2. Twenty percent of electrical service size. The electrical service size is the rated capacity of the total of all electrical services to the building, and the required solar zone size shall be based upon 10 peak watts of photovoltaic per square foot.

| EXCEPTION: | Subject to the approval of the code official, buildings with extensive rooftop equipment that would make full compliance with this section impractical shall be permitted to reduce the size of the solar zone required by Section C411.3 to the maximum practicable area. | | --- | --- |

C411.3.2 Contiguous area. The solar zone is permitted to be comprised of separated subzones. Each subzone shall be at least 5 feet wide in the narrowest dimension.

C411.3.3 Obstructions. The solar zone shall be free of pipes, vents, ducts, HVAC equipment, skylights and other obstructions, except those serving photovoltaic systems within the solar zone. The solar zone is permitted to be located above any such obstructions, provided that the racking for support of the future system is installed at the time of construction, the elevated solar zone does not shade other portions of the solar zone, and its height is permitted by the International Building Code. Photovoltaic or solar water heating systems are permitted to be installed within the solar zone.

C411.3.4 Shading. The solar zone shall be set back from any existing or new object on the building or site that is located south, east or west of the solar zone a distance at least two times the object's height above the nearest point on the roof surface. Such objects include, but are not limited to, taller portions of the building itself, parapets, chimneys, antennas, signage, rooftop equipment, trees, and roof plantings. No portion of the solar zone shall be located on a roof slope greater than 2:12 that faces within 45 degrees of true north.

C411.3.5 Access. Areas contiguous to the solar zone shall provide access pathways and provisions for emergency smoke ventilation as required by the International Fire Code.

C411.3.6 Structural integrity. The as-designed dead load and live load for the solar zone shall be clearly marked on the record drawings and shall accommodate future photovoltaic system arrays at an assumed dead load of 4 pounds per square foot in addition to other required live and dead loads. A location for future inverters shall be designated either within or adjacent to the solar zone, with a minimum area of 2 square feet for each 1000 square feet of solar zone area, and shall accommodate an assume dead load of 175 pounds per square foot. Where photovoltaic systems are installed in the solar zone, structural analysis shall be based upon calculated loads, not upon these assumed loads.

C411.3.7 Photovoltaic interconnection. Interconnection of the future photovoltaic system shall be provided for at the main service panel, either ahead of the service disconnecting means or at the end of the bus opposite the service disconnecting means, in one of the following forms:

1. A space for the mounting of a future overcurrent device, sized to accommodate the largest standard rated overcurrent device that is less than 20 percent of the bus rating.

2. Lugs sized to accommodate conductors with an ampacity of at least 20 percent of the bus rating, to enable the mounting of an external overcurrent device for interconnection.

The electrical construction documents shall indicate all of the following:

1. Solar zone boundaries and access pathways.

2. Location for future inverters and metering equipment.

3. Route for future wiring between the photovoltaic panels and the inverter, and between the inverter and the main service panel.

History

• Statutory Authority: RCW 19.27A.045 and chapter 19.27A RCW. WSR 24-16-145, § 51-11C-41100, filed 8/7/24, effective 9/7/24. Statutory Authority: RCW 19.27A.020, 19.27A.025, 19.27A.160, chapters 19.27A and 19.27 RCW. WSR 24-03-085, § 51-11C-41100, filed 1/16/24, effective 3/15/24
• WSR 22-14-091, 23-12-101, and 23-20-021 § 51-11C-41100, filed 7/1/22, 6/7/23, and 9/25/23, effective 3/15/24. Statutory Authority: RCW 19.27A.020, 19.27A.025, 19.27A.160 and chapter 19.27 RCW. WSR 19-24-040, § 51-11C-41100, filed 11/26/19, effective 7/1/20.

Wash. Admin. Code § 51-11C-41200 Section C412—Compressed air systems.

C412.1 General. All new compressed air systems, and all additions or alterations of compressed air systems where the total combined horsepower (hp) of the compressor(s) is 25 hp or more, shall meet the requirements of this section. These requirements apply to the compressors, related piping systems, and related controls that provide compressed air and do not apply to any equipment or controls that use or process the compressed air.

| EXCEPTION: | Medical gas compressed air systems in health care facilities. | | --- | --- |

C412.2 Trim compressor and storage. The compressed air system shall be equipped with an appropriately sized trim compressor and primary storage to provide acceptable performance across the range of the system and to avoid control gaps. The compressed air system shall comply with 1 or 2 below:

1. The compressed air system shall include one or more variable speed drive (VSD) compressors. For systems with more than one compressor, the total combined capacity of the VSD compressor(s) acting as trim compressors must be at least 1.25 times the largest net capacity increment between combinations of compressors. The compressed air systems hall include primary storage of at least one gallon per actual cubic feet per minute (acfm) of the largest trim compressor; or

2. The compressed air system shall include a compressor or set of compressors with total effective trim capacity at least the size of the largest net capacity increment between combinations of compressors, or the size of the smallest compressor, whichever is larger. The total effective trim capacity of single compressor systems shall cover at least the range from 70 percent to 100 percent of rated capacity. The effective trim capacity of a compressor is the size of the continuous operational range where the specific power of the compressor (kW/100 acfm) is within 15 percent of the specific power at its most efficient operating point. The total effective trim capacity of the system is the sum of the effective trim capacity of the trim compressors. The system shall include primary storage of at least 2 gallons per acfm of the largest trim compressor.

| EXCEPTIONS: | 1. Alterations where the total combined added or replaced compressor horsepower is less than the average per-compressor horsepower of all compressors in the system. | | --- | --- | | | 2. Alterations where all added or replaced compressors are variable speed drive (VSD) compressors and compressed air systems includes primary storage of at least one gallon per acfm of the largest trim compressor. | | | 3. Compressed air systems that have been preapproved as having demonstrated that the system serves loads for which typical air demand fluctuates less than 10 percent. | | | 4. Alterations of existing compressed air systems that include one or more centrifugal compressors. |

C412.3 Controls.Compressed air systems with three or more compressors and a combined horsepower rating of more than 100 hp, shall operate with controls that are able to choose the most energy efficient combination and loading of compressors within the system based on the current compressed air demand.

C412.4 Monitoring.Compressed air systems having a combined horsepower rating equal to or greater than 100 hp shall have an energy and air demand monitoring system with the following minimum requirements:

1. Measurement of system pressure.

2. Measurement of amps or power of each compressor.

3. Measurement or determination of total airflow from compressors in cfm.

4. Data logging of pressure, power in kW, airflow in cfm, and compressed air system specific efficiency in kW/100 cfm at intervals of five minutes or less.

5. Maintained data storage of at least the most recent 24 months.

6. Visual trending display of each recorded point, load and specific efficiency.

C412.5 Leak testing of compressed air piping.Compressed air system piping greater than 50 adjoining feet in length shall be pressure tested after being isolated from the compressed air supply and end-uses. The piping shall be pressurized to the design pressure and test pressures shall be held for a length of time at the discretion of the local jurisdiction, but in no case for less than 30 minutes, with no perceptible drop in pressure.

If dial gauges are used for conducting this test, for pressure tests less than or equal to 100 psi (689 kPa) gauges shall be incremented in units of 1 psi (7 kPa) less, for pressure tests greater than 100 psi (689 kPa) gauges shall be incremented in units less than 2 percent of the test pressure. Test gauges shall have a pressure range not exceeding twice the test pressure.

Piping less than or equal to 50 adjoining feet in length shall be pressurized and inspected. Connections shall be tested with a noncorrosive leak-detecting fluid or other leak-detecting methods as preapproved by the local jurisdiction.

C412.6 Pipe sizing. Compressed air piping greater than 50 adjoining feet in length shall be designed and installed to minimize frictional losses in the distribution network. These piping installations shall meet the requirements of Section C412.6.1 and either Section C412.6.2 or C412.6.3.

C412.6.1 Service line piping. Service line piping shall have inner diameters greater than or equal to 3/4 inch. Service line piping are pipes that deliver compressed air from distribution piping to end uses.

C412.6.2 Piping section average velocity. Compressor room interconnection and main header piping shall be sized so that at coincident peak flow conditions, the average velocity in the segment of pipe is no greater than 20 ft/sec. Compressor room interconnection and main header piping are the pipes that deliver compressed air from the compressor outlets to the inlet to the distribution piping. Each segment of distribution and service piping shall be sized so that at coincident peak flow conditions, the average velocity in the segment of pipe is no greater than 30 ft/sec. Distribution piping are pipes that deliver compressed air from the compressor room interconnection piping or main header piping to the service line piping.

C412.6.3 Piping total pressure drop. Piping shall be designed such that piping frictional pressure loss at coincident peak loads are less than 5 percent of operating pressure between the compressor and end use or end use regulator.

C412.7 Compressed air system acceptance. Before an occupancy permit is granted for a compressed air system, a certificate of acceptance shall be submitted to the enforcement agency that certifies that the equipment and systems meet the requirements of this code.

History

• Statutory Authority: RCW 19.27A.045 and chapter 19.27A RCW. WSR 24-16-145, § 51-11C-41200, filed 8/7/24, effective 9/7/24. Statutory Authority: RCW 19.27A.020, 19.27A.025, 19.27A.160 and chapters 19.27A and 19.27 RCW. WSR 22-14-091, 23-12-101, and 23-20-021, § 51-11C-41200, filed 7/1/22, 6/7/23, and 9/25/23, effective 3/15/24.

Wash. Admin. Code § 51-11C-50000 Chapter 5 [CE]—Existing buildings.

C501 General.

C501.1 Scope. The provisions of this chapter shall control the alteration, repair, addition and change of occupancy of existing buildings and structures.

C501.1.1 Existing buildings. Except as specified in this chapter, this code shall not be used to require the removal, alteration or abandonment of, nor prevent the continued use and maintenance of, an existing building or building system lawfully in existence at the time of adoption of this code. Unaltered portions of existing buildings used for residential purposes that received a certificate of occupancy at least three years prior to a permit application for residential uses shall not be required to comply with this code.

C501.2 Compliance.Additions, alterations, repairs, changes in space conditioning and changes of occupancy to, or relocation of, existing buildings and structures shall comply with Section C502, C503, C504, or C505 of this code, and with all applicable provisions in the International Building Code, International Existing Building Code, International Fire Code, International Fuel Gas Code, International Mechanical Code, Uniform Plumbing Code, and NFPA 70.

C501.2.1 U-factor requirements for additions and alterations. For existing building projects where an addition or building envelope alteration area is combined with existing-to-remain building areas to demonstrate compliance with this code as a whole building, the U-factors applied to existing-to-remain envelope assemblies shall be in accordance with record documents.

| EXCEPTION: | If accurate record documents are not available, U-factors for the existing envelope assemblies may be in accordance with the edition of the Washington State Energy Code that was in effect at the time the building was permitted, or as approved by the code official. | | --- | --- |

C501.2.2 Calculations of mechanical heating and cooling loads for alterations. For the installation of new or replacement mechanical equipment that serves existing building areas, design loads associated with heating, cooling and ventilation of the existing building areas served shall be determined in accordance with Section C403.1.2.

R-values and U-factors used to determine existing thermal envelope performance for the purpose of calculating design loads shall be in accordance with record documents or existing conditions.

| EXCEPTION: | If accurate record documents are not available, R-values and U-factors used to determine existing building thermal envelope performance may be in accordance with the edition of the Washington State Energy Code that was in effect at the time the building was permitted, or as approved by the code official. | | --- | --- |

C501.3 Maintenance. Buildings and structures, and parts thereof, shall be maintained in a safe and sanitary condition. Devices and systems which are required by this code shall be maintained in conformance with the code edition under which installed. The owner or the owner's authorized agent shall be responsible for the maintenance of buildings and structures. The requirements of this chapter shall not provide the basis for removal or abrogation of energy conservation, fire protection and safety systems and devices in existing structures.

C501.4 New and replacement materials. Except as otherwise required or permitted by this code, materials permitted by the applicable code for new construction shall be used. Like materials shall be permitted for repairs, provided no hazard to life, health or property is created. Hazardous materials shall not be used where the code for new construction would not permit their use in buildings of similar occupancy, purpose and location.

C501.5 Historic buildings. Provisions of this code relating to the construction, repair, alteration, restoration and movement of structures, and change of occupancy shall not be mandatory for historic buildings provided that a report has been submitted to the code official and signed by a registered design professional, or a representative of the state historic preservation office or the historic preservation authority having jurisdiction, demonstrating that compliance with that provision would threaten, degrade or destroy the historic form, fabric or function of the building.

C501.6 Commissioning. Existing building systems shall be commissioned in accordance with Section C408. For the purposes of meeting the commissioning thresholds in Section C408.1, only the new and altered system capacities are considered when determining whether the project is exempt from some portion of the commissioning process.

Reviser's note: The brackets and enclosed material in the text of the above section occurred in the copy filed by the agency.

Wash. Admin. Code § 51-11C-50200 Section C502—Additions.

C502.1 General.Additions to an existing building, building system or portion thereof shall conform to the provisions of this code as they relate to new construction without requiring the unaltered portion of the existing building or building system to comply with this code. Additions shall not create an unsafe or hazardous condition or overload existing building systems. An addition shall be deemed to comply with this code if the addition alone complies or if the existing building and addition comply with this code as a single building. This allowance applies to prescriptive compliance in accordance with Section C502.2 or total building performance in accordance with Section C407.

C502.1.1 Additional energy efficiency credits. Additions shall comply with Section C406.1. The addition shall be deemed to comply with this section if the addition alone complies or if the addition area is combined with existing building areas to demonstrate compliance with an additional efficiency credit.

C502.1.2 Renewable energy. Additions shall comply with Section C411. The addition shall be deemed to comply with this section if the addition alone complies or if the addition area is combined with existing building areas to demonstrate compliance with the requirements for on-site renewable energy or solar readiness, as applicable.

C502.2 Prescriptive compliance.Additions shall comply with Sections C502.2.1 through C502.2.6.2.

C502.2.1 Building mechanical systems. New mechanical systems and equipment serving the building heating, cooling or ventilation needs, that are installed as a part of the addition shall comply with Sections C403, C408.2, C501.6, and C506.1.

C502.2.2 Service water heating systems. New service water-heating systems and equipment that are installed as a part of the addition shall comply with Sections C404, C408.3, C501.6, and C506.1.

C502.2.3 Pools and permanent spas. Systems and equipment serving new pools and permanent spas that are installed as a part of the addition shall comply with Sections C404.11, C408.3, C501.6, and C506.1.

C502.2.4 Electrical power and lighting systems and motors. New electrical power and lighting systems and motors that are installed as a part of the addition shall comply with Sections C405, C408.4, C501.6, and C506.1.

C502.2.4.1 Interior lighting power. The total interior lighting power for the addition shall comply with Section C405.4.2 for the addition alone, or the existing building and the addition shall comply as a single building.

C502.2.4.2 Exterior lighting power. The total exterior lighting power for the addition shall comply with Section C405.5.2 for the addition alone, or the existing building and the addition shall comply as a single building.

C502.2.5 Refrigeration systems. New refrigerated spaces and refrigeration systems and equipment that are installed as a part of the addition shall comply with Sections C408.7, C410, C501.6, and C506.1.

C502.2.6 Building envelope. Additions shall comply with Sections C402.1 through C402.5, C502.2.6.1 and C502.2.6.2.

C502.2.6.1 Vertical fenestration. Additions with vertical fenestration shall comply with the following:

1. Where an addition with vertical fenestration area results in a total building vertical fenestration area less than or equal to the maximum allowed by Section C402.4.1, the addition shall comply with Section C402.4.

2. Where an addition with vertical fenestration area results in a total building vertical fenestration area greater than the maximum allowed by Section C402.4.1 (regardless of the ratio prior to the addition), the addition shall comply with one of the following:

2.1. Component performance alternative with target area adjustment per Section C402.1.5 for the addition area of the building only.

2.2. Existing building and addition area are combined to demonstrate compliance with the component performance alternative for the whole building. U-factors applied to existing envelope assemblies in the UA calculation shall comply with Section C501.2.1.

2.3. Total building performance in accordance with Section C407 for the addition area of the building only.

2.4. Total building performance for the whole building.

C502.2.6.2 Skylights.Additions with skylights shall comply with the following:

1. Where an addition with skylight area results in a total building skylight area less than or equal to the maximum allowed by Section C402.4.1, the addition shall comply with Section C402.4.

2. Where an addition with skylight area results in a total building skylight area greater than the maximum allowed by Section C402.4.1 (regardless of the ratio prior to the addition), the addition shall comply with one of the following:

2.1. Component performance alternative with target area adjustment per Section C402.1.5 for the addition area of the building only.

2.2. Existing building and addition area are combined to demonstrate compliance with the component performance alternative for the whole building. U-factors applied to existing envelope assemblies in the UA calculation shall comply with Section C501.2.1.

2.3. Total building performance in accordance with Section C407 for the addition area of the building only.

2.4. Total building performance for the whole building.

History

• Statutory Authority: RCW 19.27A.045 and chapter 19.27A RCW. WSR 24-16-145, § 51-11C-50200, filed 8/7/24, effective 9/7/24. Statutory Authority: RCW 19.27A.020, 19.27A.025, 19.27A.160 and chapters 19.27A and 19.27 RCW. WSR 22-14-091, 23-12-101, and 23-20-021, § 51-11C-50200, filed 7/1/22, 6/7/23, and 9/25/23, effective 3/15/24. Statutory Authority: RCW 19.27A.020, 19.27A.025, 19.27A.160 and chapter 19.27 RCW. WSR 19-24-040, § 51-11C-50200, filed 11/26/19, effective 7/1/20. Statutory Authority: RCW 19.27A.025, 19.27A.160, and 19.27.074. WSR 16-03-072, § 51-11C-50200, filed 1/19/16, effective 7/1/16.

Wash. Admin. Code § 51-11C-50300 Section C503—Alterations.

C503.1 General. Alterations to any building or structure shall comply with the requirements of Section C503 and the code for new construction. Alterations to an existing building, building system or portion thereof shall conform to the provisions of this code as they relate to new construction without requiring the unaltered portions of the existing building or building system to comply with this code. Alterations shall be such that the existing building or structure is no less conforming with the provisions of this code than the existing building or structure was prior to the alteration. The additional energy efficiency credit requirements in Section C406.1 and the renewable energy requirements in Section C411 do not apply to alterations.

| EXCEPTION: | The following alterations need not comply with the requirements for new construction provided the energy use of the building is not increased: | | --- | --- | | | 1. Storm windows installed over existing fenestration. | | | 2. Surface applied window film installed on existing single pane fenestration assemblies to reduce solar heat gain provided the code does not require the glazing fenestration to be replaced. | | | 3. Existing ceiling, wall or floor cavities exposed during construction provided that these cavities are insulated to full depth with insulation having a minimum nominal value of R-3.0 per inch installed per Section C402. | | | 4. Construction where the existing roof, wall or floor cavity is not exposed. | | | 5. Roof recover. | | | 6. Air barriers shall not be required for roof recover and roof replacement where the alterations or renovations to the building do not include alterations, renovations or repairs to the remainder of the building envelope. | | | 7. Replacement of existing doors that separate conditioned space from the exterior shall not require the installation of a vestibule or revolving door, provided however that an existing vestibule that separates a conditioned space from the exterior shall not be removed. |

C503.2 Reserved.

C503.3 Building envelope. New building envelope assemblies that are part of the alteration shall comply with Sections C402.1 through C402.5 and Sections C503.3.1 through C503.3.3.

| EXCEPTION: | Air leakage testing is not required for alterations and repairs, unless the project includes a change in space conditioning according to Section C503.2 or a change of occupancy or use according to Section C505.1. | | --- | --- |

C503.3.1 Roof replacement.Roof replacements shall comply with Table C402.1.3 or C402.1.4 where the existing roof assembly is part of the building thermal envelope and contains no insulation or the insulation is located entirely above the roof deck. In no case shall the R-value of the roof insulation be reduced or the U-factor of the roof assembly be increased as part of the roof replacement.

C503.3.2 Vertical fenestration. Alterations that include the addition of new vertical fenestration area shall comply with the following:

1. Where the addition of new vertical fenestration area results in a total building vertical fenestration area less than or equal to the maximum allowed by Section C402.4.1, the alteration shall comply with Section C402.4.

2. Where the addition of new vertical fenestration area result in a total building vertical fenestration area greater than the maximum allowed by Section C402.4.1 (regardless of the ratio prior to the addition), the alteration shall comply with one of the following:

2.1. Vertical fenestration alternate in accordance with Section C402.4.1.1 for the new vertical fenestration added.

2.2. Vertical fenestration alternate in accordance with Section C402.4.1.1 for the area adjacent to the new vertical fenestration added.

2.3. Existing building and alteration areas are combined to demonstrate compliance with the component performance alternate in accordance with Section C402.1.5 for the whole building. U-factors applied to existing envelope assemblies in the UA calculation shall comply with Section C501.2.1. The Proposed Total UA is allowed to be up to 110 percent of the Allowed Total UA.

2.4. Total building performance in accordance with Section C407 for the whole building. The total annual site energy use of the proposed design is allowed to be up to 110 percent of the annual site energy use allowed in accordance with Section C407.3.

| EXCEPTION: | Where approved by the code official, additional fenestration is permitted where sufficient envelope upgrades beyond those required by other sections of this code are included in the project so that the addition of new vertical fenestration does not cause an increase in the overall energy use of the building. | | --- | --- |

C503.3.2.1 Replacement fenestration products. Where some or all of an existing fenestration unit is replaced with a new fenestration product, including sash and glazing, the replacement fenestration unit shall meet the applicable requirements for U-factor and SHGC in Table C402.4.

| EXCEPTION: | An area-weighted average of the U-factor of replacement fenestration products being installed in the building for each fenestration product category listed in Table C402.4 shall be permitted to satisfy the U-factor requirements for each fenestration product category listed in Table C402.4. Individual fenestration products from different product categories listed in Table C402.4 shall not be combined in calculating the area-weighted average U-factor. | | --- | --- |

C503.3.3 Skylights. Alterations that include the addition of new skylight area shall comply with the following:

1. Where the addition of new skylight area results in a total building skylight area less than or equal to the maximum allowed by Section C402.4.1, the alteration shall comply with Section C402.4.

2. Where the addition of new skylight area results in a total building skylight area greater than the maximum allowed by Section C402.4.1 (regardless of the ratio prior to the addition), the alteration shall comply with one of the following:

2.1. Existing building and alteration area are combined to demonstrate compliance with the component performance alternative with target area adjustment in accordance with Section C402.1.5 for the whole building. U-factors applied to existing envelope assemblies in the UA calculation shall comply with Section C501.2.1. The Proposed Total UA is allowed to be up to 110 percent of the Allowed Total UA.

2.2. Total building performance in accordance with Section C407 for the whole building. The annual site energy use of the proposed design is allowed to be up to 110 percent of the annual site energy use allowed in accordance with Section C407.3.

| EXCEPTION: | Additional envelope upgrades are included in the project so the addition of new skylights does not cause a reduction in overall building energy efficiency, as approved by the code official. | | --- | --- |

C503.4 Building mechanical systems. Components of existing mechanical systems that are altered or replaced shall comply with Section C403 or Section C407, unless specifically exempted in Section C503.4, and Sections C408.2, C501.2.2, C501.6, C503.4.2 through C503.4.6, and C506.1. Additions or alterations shall not be made to an existing mechanical system that will cause the existing system to become out of compliance.

| EXCEPTIONS: | 1. Existing mechanical systems are not required to be modified to comply with Section C403.3.5 where mechanical cooling capacity is not added to a system that did not have cooling capacity prior to the alteration. | | --- | --- | | | 2. Compliance with Section C403.1.4 is not required where the alteration does not include replacement of a heating appliance. | | | 3. Alternate mechanical system designs that are not in full compliance with this code may be approved when the code official determines that existing building constraints including, but not limited to, available mechanical space, limitations of the existing structure, or proximity to adjacent air intakes or exhausts makes full compliance impractical. Alternate designs shall include additional energy saving strategies not prescriptively required by this code for the scope of the project including, but not limited to, demand control ventilation, energy recovery, or increased mechanical cooling or heating equipment efficiency above that required by Tables C403.3.2(1) through C403.3.2 (16). | | | 4. Only those components of existing HVAC systems that are altered or replaced shall be required to comply with Section C403.8.1. Section C403.8.1 does not require the removal and replacement of existing system ductwork. Additional fan power allowances are available when determining the fan power budget (Fan kWbudget) as specified in Table C503.4. These values can be added to the fan power allowance values in Tables C403.8.1.1(1) and C403.8.1.1(2) when calculating a new Fan kWbudget for the fan system being altered. The additional fan power allowance is not applicable to alterations that add or change passive components which do not increase the fan system static pressure. |

Table C503.4

Additional Fan Power Allowances (W/CFM)

| Airflow | Multi-Zone VAV Systemsa ≤5,000 cfm | Multi-Zone VAV Systemsa ˃5,000 and ≤10,000 cfm | Multi-Zone VAV Systemsa ˃10,000 cfm | All Other Fan Systems ≤5,000 cfm | All Other Fan Systems ˃5,000 and ≤10,000 cfm | All Other Fan Systems ˃10,000 cfm | | --- | --- | --- | --- | --- | --- | --- | | Supply Fan System additional allowance | 0.135 | 0.114 | 0.105 | 0.139 | 0.120 | 0.107 | | Supply Fan System additional allowance in unit with adapter curb | 0.033 | 0.033 | 0.043 | 0.000 | 0.000 | 0.000 | | Exhaust/ Relief/ Return/ Transfer Fan System additional allowance | 0.070 | 0.061 | 0.054 | 0.070 | 0.062 | 0.055 | | Exhaust/ Relief/ Return/ Transfer Fan System additional allowance with adapter curb | 0.016 | 0.017 | 0.220 | 0.000 | 0.000 | 0.000 |

| a | See definition of FAN SYSTEM, MULTI-ZONE VARIABLE AIR VOLUME (VAV). | | --- | --- |

C503.4.1 New building mechanical systems. All new mechanical systems and equipment in existing buildings shall comply with Sections C403, C408.2, C501.6, and C506.1.

C503.4.2 Addition of cooling capacity. Where mechanical cooling is added to a space that was not previously cooled, the mechanical system shall comply with either Section C403.3.5 or C403.5.

| EXCEPTIONS: | 1. Qualifying small equipment: Economizers are not required for cooling units and split systems serving one zone with a total cooling capacity rated in accordance with Section C403.3.2 of less than 33,000 Btu/h (hereafter referred to as qualifying small systems) provided that these are high-efficiency cooling equipment with SEER and EER values more than 15 percent higher than minimum efficiencies listed in Tables C403.3.2 (1), (2), (4), (8), (9), and (14), in the appropriate size category, using the same test procedures. Equipment shall be listed in the appropriate certification program to qualify for this exception. The total capacity of all qualifying small equipment without economizers shall not exceed 72,000 Btu/h per building, or 5 percent of the building total air economizer capacity, whichever is greater. | | --- | --- | | | Notes and exclusions for Exception 1: | | | 1.1. The portion of the equipment serving Group R occupancies is not included in determining the total capacity of all units without economizers in a building. | | | 1.2. Redundant units are not counted in the capacity limitations. | | | 1.3. This exception shall not be used for the initial tenant improvement of a shell-and-core building or space, or for Total Building Performance in accordance with Section C407. | | | 1.4. This exception shall not be used for unitary cooling equipment installed outdoors or in a mechanical room adjacent to the outdoors. | | | 2. Chilled water terminal units connected to systems with chilled water generation equipment with IPLV values more than 25 percent higher than minimum part load equipment efficiencies listed in Table C403.3.2 (3), in the appropriate size category, using the same test procedures. Equipment shall be listed in the appropriate certification program to qualify for this exception. The total capacity of all systems without economizers shall not exceed 480,000 Btu/h per building, or 20 percent of the building total air economizer capacity, whichever is greater. | | | Notes and exclusions for Exception 2: | | | 2.1. The portion of the equipment serving Group R occupancy is not included in determining the total capacity of all units without economizers in a building. | | | 2.2. This exception shall not be used for the initial tenant improvement of a shell-and-core building or space, or for total building performance in accordance with Section C407. |

C503.4.3 Alterations or replacement of existing cooling systems. Alterations to, or replacement of, existing mechanical cooling systems shall not decrease the building total economizer capacity unless the system complies with either Section C403.3.5 or C403.5. System alterations or replacement shall comply with Table C503.4.3 when either the individual cooling unit capacity or the building total capacity of all cooling equipment without economizer does not comply with the exceptions in Section C403.5. Equipment replacements that include space heating shall also comply with Section C503.4.6.

Table C503.4.3

Economizer Compliance Options for Mechanical Alterations

| | Option A | Option B (alternate to A) | Option C (alternate to A) | Option D (alternate to A) | | --- | --- | --- | --- | --- | | Unit Type | Any alteration with new or replacement equipment | Replacement unit of the same type with the same or smaller output capacity | Replacement unit of the same type with a larger output capacity | New equipment added to existing system or replacement unit of a different type | | 1. Packaged Units | Efficiency: min. a Economizer: C403.5b | Efficiency: min. a Economizer: C403.5b | Efficiency: min. a Economizer: C403.5b | Efficiency: min. a Economizer: C403.5b | | 2. Split Systems | Efficiency: min. a Economizer: C403.5b | For units ≤ 60,000 Btuh, comply with two of two measures: 1. Efficiency: + 10%e 2. Economizer: shall not decrease existing economizer capability | For units ≤ 60,000 Btuh replacing unit installed prior to 1991 comply with at least one of two measures: 1. Efficiency: + 10%e 2. Economizer: 50% f | Efficiency: min. a Economizer: C403.5b | | For all other capacities: Efficiency: min.a Economizer: C403.5b | For all other capacities: Efficiency: min.a Economizer: C403.5b | | | | | 3. Water Source Heat Pump | Efficiency: min. a Economizer: C403.5b | For units ≤ 72,000 Btuh, comply with at least two of three measures: 1. Efficiency: +10%e 2. Flow control valve g 3. Economizer: 50% f | For units ≤ 72,000 Btuh, comply with at least three of three measures: 1. Efficiency: +10%e 2. Flow control valve g 3. Economizer: 50% f (except for certain pre-1991 systems q) | Efficiency: min. a Economizer: C403.5b (except for certain pre-1991 systems q) | | | | For all other capacities: Efficiency: min.a Economizer: C403.5b | For all other capacities: Efficiency: min.a Economizer: C403.5b | | | 4. Water Economizer using Air-Cooled Heat Rejection Equipment (Dry Cooler) | Efficiency: min. a Economizer: C403.5b | Efficiency: + 5%d Economizer: shall not decrease existing economizer capacity | Efficiency: min.a Economizer: C403.5b | Efficiency: min. a Economizer: C403.5b | | 5. Air-Handling Unit (including fan coil units) where the system has an air-cooled chiller | Efficiency: min. a Economizer: C403.5b | Economizer: shall not decrease existing economizer capacity | Efficiency: min.a Economizer: C403.5b (except for certain pre-1991 systems q) | Efficiency: min.a Economizer: C403.5b (except for certain pre-1991 systems q) | | 6. Air-Handling Unit (including fan coil units) and Water-cooled Process Equipment, where the system has a water-cooled chiller10 | Efficiency: min. a Economizer: C403.5b | Economizer: shall not decrease existing economizer capacity | Efficiency: min.a Economizer: C403.5b (except for certain pre-1991 systems q and certain 1991-2016 systems i) | Efficiency: min. a Economizer: C403.5b (except for certain pre-1991 systems q and certain 1991-2016 systems i) | | 7. Cooling Tower | Efficiency: min. a Economizer: C403.5b | No requirements | Efficiency: min.a Economizer: C403.5b | Efficiency: min.a Economizer: C403.5b | | 8. Air-Cooled Chiller | Efficiency: min. a Economizer: C403.5b | Efficiency: + 10%k Economizer: shall not decrease existing economizer capacity | Efficiency: Comply with two of two measures: 1. + 10% k,l and 2. Multistage compressor(s) Economizer: shall not decrease existing economizer capacity | Efficiency: min. a Economizer: C403.5b | | 9. Water-Cooled Chiller | Efficiency: min. a Economizer: C403.5b | Efficiency: Comply with at least one of two measures: 1. Part load IPLV + 15%n or 2. Plate frame heat exchanger o Economizer: shall not decrease existing economizer capacity | Efficiency: Comply with two of two measures: 1. Part load IPLV + 15% n 2. Plate-frame heat exchanger o Economizer: shall not decrease existing economizer capacity | Efficiency: min. a Economizer: C403.5b | | 10. Package Terminal Air Conditioner | Efficiency: min. a Economizer: C403.5b | Efficiency: + 5%a Economizer: shall not decrease existing economizer capacity | Efficiency: + 5%a Economizer: shall not decrease existing economizer capacity | Efficiency: min. a Economizer: C403.5b | | 11. Package Terminal Heat Pump | Efficiency: min. a Economizer: C403.5b | Cooling efficiency: + 5%d Heating efficiency: + 10%e Shall not decrease existing economizer capacity | Cooling efficiency: + 5%d Heating efficiency: + 10%e Shall not decrease existing economizer capacity | Efficiency: min. a Economizer: C403.5b |

| a | Minimum equipment efficiency shall comply with Section C403.3.2 and the tables in Section C403.3.2. | | | --- | --- | --- | | b | All separate new equipment and replacement equipment shall have air economizer complying with Section C403.5 including both the individual unit size limits and the total building capacity limits on units without economizer. It is acceptable to comply using one of the exceptions to Section C403.5. | | | c | Reserved. | | | d | Equipment shall have a capacity-weighted average cooling system efficiency that is 5% better than the requirements in the tables in Section C403.3.2 (1.05 × values in the tables). | | | e | Equipment shall have a capacity-weighted average cooling system efficiency that is 10% better than the requirements in the tables in Section C403.3.2 (1.10 × values in the tables). | | | f | Minimum of 50% air economizer that is ducted in a fully enclosed path directly to every heat pump unit in each zone, except that ducts may terminate within 12 inches of the intake to an HVAC unit provided that they are physically fastened so that the outside air duct is directed into the unit intake. If this is an increase in the amount of outside air supplied to this unit, the outside air supply system shall be configured to provide this additional outside air and be equipped with economizer control. | | | g | Water-source heat pump systems shall have a flow control valve to eliminate flow through the heat pumps that are not in operation and variable speed pumping control complying with Section C403.4.3 for that heat pump. | | | | | - When the total capacity of all units with flow control valves exceeds 15% of the total system capacity, a variable frequency drive shall be installed on the main loop pump. | | | | - As an alternate to this requirement, the capacity-weighted average cooling system efficiency shall be 5% better than the requirements in footnote e for water-source heat pumps (i.e., a minimum of 15% greater than the requirements in Table C403.3.2(14)). | | h | Water economizer equipment shall have a capacity-weighted average cooling system efficiency that is 10% better than the requirements in Tables C403.3.2(7), C403.3.2(10), and C403.3.2(16) (1.10 × values in Tables C403.3.2(7), C403.3.2(10), and C403.3.2(16)). | | | i | Air economizer is not required for systems installed with water economizer plate and frame heat exchanger complying with previous codes between 1991 and June 2016, provided that the total fan coil load does not exceed the existing or added capacity of the heat exchangers. | | | j | For water-cooled process equipment where the manufacturers specifications require colder temperatures than available with waterside economizer, that portion of the load is exempt from the economizer requirements. | | | k | The air-cooled chiller shall have an IPLV efficiency that is a minimum of 10% greater than the IPLV requirements in EER in Table C403.3.2(3) (1.10 × IPLV values in EER in Table C403.3.2(3)). | | | l | The air-cooled chiller shall be multistage with a minimum of two compressors. | | | m | The water-cooled chiller shall have full load and part load IPLV efficiency that is a minimum of 5% greater than the IPLV requirements in Table C403.3.2(3). | | | n | The water-cooled chiller shall have an IPLV value that is a minimum of 15% lower than the IPLV requirements in Table C403.3.2(3) ( 0.85 × IPLV values in Table C403.3.2 (3)). Water-cooled centrifugal chillers designed for nonstandard conditions shall have an NPLV value that is at least 15% lower than the adjusted maximum NPLV rating in kW per ton defined in Section C403.3.2.3 ( 0.85 × NPLV). | | | o | Economizer cooling shall be provided by adding a plate-frame heat exchanger on the waterside with a capacity that is a minimum of 20% of the chiller capacity at standard AHRI rating conditions. | | | p | Reserved. | | | q | Systems installed prior to 1991 without fully utilized capacity are allowed to comply with Option B, provided that the individual unit cooling capacity does not exceed 90,000 Btuh. | |

C503.4.4 Controls for cooling equipment replacement. When space cooling equipment is replaced, controls shall comply with all requirements under Section C403.3.5 and related subsections, and Section C403.5.1 for integrated economizer control.

C503.4.5 Mechanical equipment relocation. Existing equipment currently in use may be relocated within the same floor or same tenant space if removed and reinstalled within the same permit.

C503.4.6 Addition or replacement of heating appliances. Where a mechanical heating appliance is added or replaced, the added or replaced appliance shall comply with Section C401.3, Section C403.1.4, or with an alternate compliance option in Table C503.4.6. Where use of heat pump equipment for space heating is required by this section, it is permissible to utilize the Fossil Fuel Compliance Path in Section C401.3 to attain the credits required for building additions shown in Table C401.3.3.

| EXCEPTIONS: | 1. Terminal unit equipment including, but not limited to, hydronic VAV boxes, electric resistance VAV boxes, electric duct heaters, water source heat pumps, fan coils, or VRF indoor units that are served by an unaltered central system. | | --- | --- | | | 2. Air handling equipment with hydronic coils. | | | 3. Air handling equipment designed for 100 percent outdoor air that is not subject to the requirements in Section C403.3.5 or that qualifies for an exception to Section C403.3.5. | | | 4. Replacement of existing oil-fired boilers. | | | 5. Replacement of existing steam boilers with steam distribution to terminal units and the associated boiler feed equipment. | | | 6. Where compliance with Section C403.1.4 would trigger an unplanned utility electrical service upgrade based on the NEC 220.87 method for determining existing loads. | | | 7. Replacement of heating equipment with equipment that is the same type and where the rated capacity of the new equipment does not exceed the rated capacity of the existing equipment. |

Table C503.4.6

Compliance Options for Mechanical Heating Equipment Alterations

| | Proposed Heating Equipment Typea | Heating Efficiency Table Reference | Alternate Compliance Options to Section C403.1.4 | | --- | --- | --- | --- | | 1 | Air-Cooled Unitary Heat Pumps | Table C403.3.2(2) | 1. Compliance with C403.1.4, except heat pump rated capacity in accordance with Section C403.1.4 exception 5d is permitted to be sized equal to the supplemental internal resistance heating capacity in Climate Zone 4 or 5c 2. Compliance with C403.1.4, except electric resistance mixed air preheat is permissiblec | | 2 | Packaged terminal, single-package vertical, and room air-conditioner heat pumps | Table C403.3.2(4) | 1. Compliance with C403.1.4, except heat pump rated capacity in accordance with Section C403.1.4 Exception 5d is permitted to be sized equal to the supplemental internal resistance heating capacity in Climate Zone 4 or 5 | | 3 | Furnaces, duct furnaces, and unit heaters | Table C403.3.2(5) | 1. Efficiency: + 5%b | | 4 | Gas-fired hot water boilers with fewer than 80% of served coils replaced | Table C403.3.2(6) | 1. Efficiency: + 5%b | | 5 | Variable refrigerant flow air-to-air and applied heat pumps | Table C403.3.2(9) | No alternate compliance option | | 6 | DX-DOAS equipment | Table C403.3.2(12) and Table C403.3.2(13) | 1. DX-DOAS is provided with heat recovery if not required by C403.3.5.1. | | 7 | Water-source heat pumps | Table C403.3.2(14) | No alternate compliance option |

| a | Includes replacement of equipment with a unit that is the same type or higher efficiency and the same or lower capacity, or a replacement of one equipment type with a different equipment type. | | --- | --- | | b | Equipment shall have a capacity-weighted average heating system efficiency that is five percent better than that shown in the reference table (1.05 x values in reference table). | | c | Option 1 and Option 2 can be combined. |

C503.4.6.1 Hydronic system alteration supply water temperature. Hydronic heating coils and appliances subject to Section C503.4.5 or Section C503.4.6 shall comply with Section C403.3.8.2.

C503.5 Service water heating equipment. All new service water heating systems, equipment, and components of existing systems that are altered or replaced shall comply with Section C407 or Sections C404, C408.3, C501.6, and C506.1. Additions or alterations shall not be made to an existing service water heating system that will cause the existing system to become out of compliance. Where use of heat pump equipment for service water heating is required by this section, it is permissible to utilize the Fossil Fuel Compliance Path in Section C401.3 to attain the credits required for building additions shown in Table C401.3.3.

| EXCEPTION: | The following equipment is not required to comply with Section C401.3 or Section C404.2.1, as applicable: | | --- | --- | | | 1. Replacement of service water heating appliances with equipment that is the same type and has the same or higher efficiency and the same or lower capacity, provided there are no other alterations made to the existing service water heating system size or configuration. | | | 2. Replacement of any of the following water heater appliances: | | | 2.1. Electric water heaters with an input of 12 kW or less. | | | 2.2. Gas storage water heaters with an input of 75,000 Btu/h or less. | | | 2.3. Gas instantaneous water heaters with an input of 200,000 Btu/h or less and 2 gallons or less of storage. | | | 3. Where it has been determined by the code official that existing building constraints including, but not limited to, available floor space or ceiling height, limitations of the existing structure, or electrical service capacity, make compliance technically infeasible. |

C503.6 Pools and permanent spas. All new systems and equipment serving pools and permanent spas and components of existing systems that are altered or replaced, shall comply with Sections C404.11, C408.3, C501.6, and C506.1. Additions or alterations shall not be made to an existing system serving a pool or spa that will cause the existing system to become out of compliance.

C503.7 Electrical power and lighting systems and motors. Alterations or the addition of lighting, receptacles and motors shall comply with Sections C503.7.1 through C503.7.7. Additions or alterations shall not be made to an existing lighting or electrical system that will cause the existing system to become out of compliance.

C503.7.1 New lighting systems and controls. All new interior and exterior lighting systems within an existing building site shall be provided with lighting controls in accordance with Section C405.2 and shall comply with C408.4, C501.6, and C506.1.

C503.7.2 Luminaire additions and alterations. Alterations that add or replace 20 percent or more of the luminaires in a space enclosed by walls or ceiling-height partitions, replace 20 percent or more of parking garage luminaires, or replace 20 percent or more of the total installed wattage of exterior luminaires shall comply with Sections C405.4 and C405.5. Exterior power allowance shall be determined using the specific area allowances for the areas altered and shall not include the base site allowance. Where less than 20 percent of the fixtures in an interior space enclosed by walls or ceiling-height partitions or in a parking garage are added or replaced, or less than 20 percent of the installed exterior wattage is replaced, the installed lighting wattage shall be maintained or reduced.

C503.7.3 Rewiring and recircuiting. Where new wiring is being installed to serve added fixtures and/or fixtures are being relocated to a new circuit, lighting controls shall comply with all applicable requirements in accordance with Sections C405.2.1, C405.2.3, C405.2.4, C405.2.5, C405.2.6, C405.2.7, C405.2.8, C408.4, and C501.6.

C503.7.4 New or moved lighting panel. Where a new lighting panel (or a moved lighting panel) with all new raceway and conductor wiring from the panel to the fixtures is being installed, lighting controls shall also comply with, in addition to the requirements of Section C503.7.3, all requirements in Sections C405.2, C408.4, and C501.6.

C503.7.5 Newly created rooms. Where new walls or ceiling-height partitions are added to an existing space and create a new enclosed space, but the lighting fixtures are not being changed, other than being relocated, the new enclosed space shall have lighting controls that comply with all applicable requirements in accordance with Sections C405.2.1, C405.2.2, C405.2.3, C405.2.4, C405.2.5, C405.2.6, C408.4 and C501.6.

C503.7.6 Motors. Motors that are altered or replaced shall comply with Section C405.8.

C503.7.7 Controlled receptacles. Where electric receptacles are added or replaced, controlled receptacles shall be provided in accordance with Section C405.10 and shall comply with Sections C408.4 and C501.6.

| EXCEPTIONS: | 1. Where an alteration project impacts an area smaller than 5,000 square feet, controlled receptacles are not required. | | --- | --- | | | 2. Where existing systems furniture or partial-height relocatable office cubical partitions are reconfigured or relocated within the same area, controlled receptacles are not required in the existing systems furniture or office cubicle partitions. | | | 3. Where new or altered receptacles meet exception 1 to Section C405.10.1, they are not required to be controlled receptacles or be located within 12 inches of noncontrolled receptacles. |

C503.8 Refrigeration systems. Components of existing refrigeration systems that are altered or replaced shall comply with Sections C408.7, C410 and C501.6. Additions or alterations shall not be made to an existing refrigeration system that will cause the existing system to become out of compliance. All new refrigerated spaces and refrigeration systems and equipment in existing buildings, including new refrigerated display cases, shall comply with Sections C408.7, C410, C501.6, and C506.1.

History

• Statutory Authority: RCW 19.27A.045 and chapter 19.27A RCW. WSR 24-16-145, § 51-11C-50300, filed 8/7/24, effective 9/7/24. Statutory Authority: RCW 19.27A.020, 19.27A.025, 19.27A.160, chapters 19.27A and 19.27 RCW. WSR 24-03-085, § 51-11C-50300, filed 1/16/24, effective 3/15/24
• WSR 22-14-091, 23-12-101, and 23-20-021, § 51-11C-50300, filed 7/1/22, 6/7/23, and 9/25/23, effective 3/15/24. Statutory Authority: RCW 19.27A.025, 19.27A.045 and chapter 19.27 RCW. WSR 20-21-080, § 51-11C-50300, filed 10/19/20, effective 2/1/21. Statutory Authority: RCW 19.27A.020, 19.27A.025, 19.27A.160 and chapter 19.27 RCW. WSR 19-24-040, § 51-11C-50300, filed 11/26/19, effective 7/1/20. Statutory Authority: RCW 19.27A.020, 19.27A.025 and chapters 19.27A and 19.27 RCW. WSR 19-02-089, § 51-11C-50300, filed 1/2/19, effective 7/1/19. Statutory Authority: RCW 19.27A.025, 19.27A.045, 19.27A.160, and 19.27.074. WSR 16-24-070, § 51-11C-50300, filed 12/6/16, effective 5/1/17
• WSR 16-13-089, § 51-11C-50300, filed 6/15/16, effective 7/16/16. Statutory Authority: RCW 19.27A.025, 19.27A.160, and 19.27.074. WSR 16-03-072, § 51-11C-50300, filed 1/19/16, effective 7/1/16.

Wash. Admin. Code § 51-11C-50400 Section C504—Repairs.

C504.1 General. Buildings and structures, and parts thereof, shall be repaired in compliance with Section C501.3 and this section. Work on nondamaged components that is necessary for the required repair of damaged components shall be considered part of the repair and shall not be subject to the requirements for alterations in this chapter. Routine maintenance required by Section C501.3, ordinary repairs exempt from permit, and abatement of wear due to normal service conditions shall not be subject to the requirements for repairs in this section.

C504.2 Application. For the purposes of this code, the following shall be considered repairs.

1. Glass only replacements in an existing sash and frame.

2. Roof repairs.

3. Air barriers shall not be required for roof repair where the repairs to the building do not include alterations, renovations or repairs to the remainder of the building envelope.

4. Replacement of existing doors that separate conditioned space from the exterior shall not require the installation of a vestibule or revolving door, provided however that an existing vestibule that separates a conditioned space from the exterior shall not be removed.

5. Repairs where only the bulb and/or ballast within the existing luminaires in a space are replaced provided that the replacement does not increase the installed interior lighting power.

History

• Statutory Authority: RCW 19.27A.025, 19.27A.160, and 19.27.074. WSR 16-03-072, § 51-11C-50400, filed 1/19/16, effective 7/1/16.

Wash. Admin. Code § 51-11C-50500 Section C505—Change of space conditioning, occupancy or use.

C505.1 General. Buildings or spaces undergoing a change in space conditioning alteration shall comply with Sections C505.2 and C505.4. Buildings or spaces undergoing a change in occupancy alteration shall comply with Sections C505.3 and C505.4. Spaces changing from one use type to another shall comply with Section C505.5.

Buildings or spaces undergoing a change in space conditioning, change in occupancy or use shall conform to the provisions of this code without requiring the unaltered portion of the existing building to comply with this code. Alterations shall be such that the existing building or structure is no less conforming to the provisions of this code than the existing building or structure was prior to the alteration.

A change in space conditioning alteration shall be deemed to comply with this code if the alteration area alone complies or if the alteration area is combined with all other spaces within the existing building that are of the same space conditioning category according to Section C505.2 to demonstrate compliance. A change in occupancy alteration shall be deemed to comply with this code if the alteration area alone complies or if the existing building and the alteration area are combined to demonstrate compliance for the whole building. This allowance applies to prescriptive compliance in accordance with Section C505.4 or total building performance in accordance with Section C407.

Buildings or spaces that were permitted prior to the 2009 Washington state energy code, or were originally permitted as unconditioned, may comply with this section as follows:

1. Where the component performance alternative in Section C402.1.5 is used to demonstrate compliance with this section, the Proposed Total UA is allowed to be up to 110 percent of the Allowable Total UA. This exception may be applied to the project area alone, or to the existing building and project area combined as a whole building.

2. Where total building performance in accordance with Section C407 is used to demonstrate compliance with this section, the total annual site energy use of the proposed design is allowed to be up to 110 percent of the annual site energy use allowed by Section C407.3. This exception may be applied to the project area alone, or to the existing building and project area combined as a whole building.

C505.1.1 Additional energy efficiency credits. Buildings or spaces that are required to comply with Sections C505.2 or C505.3 shall also comply with Section C502.1.1 in the same manner as an addition.

C505.1.2 Renewable energy. Buildings or spaces that are required to comply with Section C505.2 or C505.3 shall also comply with Section C502.1.2 in the same manner as an addition.

C505.2 Change in space conditioning. Spaces undergoing a change in space conditioning alteration shall be brought up to full compliance with this code for all disciplines in the following cases:

1. Any low energy space in accordance with Section C402.1.1.1 that is altered to become conditioned space or semi-heated space shall be brought into full compliance with this code.

2. Any semi-heated space in accordance with Section C402.1.1.2 that is altered to no longer qualify as semi-heated space shall be brought into full compliance with this code.

For buildings with more than one space conditioning category, the interior partition walls, ceilings, floors and fenestration that separate space conditioning areas shall comply with the thermal envelope requirements per the area with the highest level of space conditioning.

C505.3 Change in occupancy. Spaces undergoing a change in occupancy alteration shall be brought up to full compliance with this code for all disciplines in the following cases:

1. Any space that is converted from a Group F, S or U occupancy to an occupancy other than Group F, S or U.

2. Any space that is converted to a Group R dwelling unit or portion thereof, from another use or occupancy.

3. Any Group R dwelling unit or portion thereof permitted prior to July 1, 2002, that is converted to a commercial use or occupancy.

C505.4 Prescriptive compliance. Change in space conditioning and change in occupancy alterations shall comply with Sections C505.4.1 through C505.4.7.

C505.4.1 Vertical fenestration. A change in space conditioning alteration with vertical fenestration shall comply with the following:

1. Where the vertical fenestration area of the alteration combined with the vertical fenestration area of all equivalent space conditioning areas in the existing building results in a total vertical fenestration area that is less than or equal to the maximum allowed by Section C402.4.1, the alteration shall comply with Section C402.4.

2. Where the vertical fenestration area of the alteration combined with the vertical fenestration area of all equivalent space conditioning areas in the existing building results in a total vertical fenestration area that is greater than the maximum allowed by Section C402.4.1, the alteration shall comply with one of the following:

2.1. Component performance alternative with target area adjustment in accordance with Section C402.1.5 for the alteration area of the building only.

2.2. Alteration area is combined with all equivalent space conditioning areas to demonstrate compliance with the component performance alternative.

2.3. Total building performance in accordance with Section C407 for the alteration area of the building only.

2.4. Alteration area is combined with all equivalent space conditioning areas to demonstrate total building performance compliance.

C505.4.2 Skylights. A change in space conditioning alteration with skylights shall comply with the following:

1. Where the skylight area of the alteration combined with the skylight area of all equivalent space conditioning areas in the existing building results in a total skylight area that is less than or equal to the maximum allowed by Section C402.4.1, the alteration shall comply with Section C402.4.

2. Where the skylight area of the alteration combined with the skylight area of all equivalent space conditioning areas in the existing building results in a total skylight area that is greater than the maximum allowed by Section C402.4.1, the alteration shall comply with one of the following:

2.1. Component performance alternative with target area adjustment in accordance with Section C402.1.5 for the alteration area of the building only.

2.2. Alteration area is combined with all equivalent space conditioning areas to demonstrate compliance with the component performance alternative.

2.3. Total building performance in accordance with Section C407 for the alteration area of the building only.

2.4. Alteration area is combined with all equivalent space conditioning areas to demonstrate total building performance compliance.

C505.4.3 Building mechanical systems. All new and existing mechanical systems and equipment that serve the new building heating, cooling and ventilation needs of the alteration area shall comply with Sections C403, C408.2, C501.6, and C506.1.

C505.4.4 Service water-heating systems. All new and existing service water-heating systems and equipment that serve the new service water-heating needs of the alteration area shall comply with Sections C404, C408.3, C501.6, and C506.1.

C505.4.5 Pools and permanent spas. All new and existing systems and equipment serving pools and permanent spas that are included in the alteration shall comply with Sections C404.11, C408.3, C501.6, and C506.1.

C505.4.6 Electrical power and lighting systems and motors. All new and existing electrical power and lighting systems and motors that are included in the alteration shall comply with Sections C405, C408.4, C501.6, and C506.1.

C505.4.7 Refrigeration systems. All new and existing refrigerated spaces and refrigeration systems and equipment that serve the new refrigeration needs of the alteration area shall comply with Sections C410, C408.7, C501.6, and C506.1.

C505.5 Change of use. Where the use in a space changes from one use in Table C405.4.2 (1) or (2) to another use in Table C405.4.2 (1) or (2), the installed lighting wattage in the space shall comply with Section C405.4 and the ventilation air flow provided to the space shall be in accordance with Chapter 4 of the International Mechanical Code.

History

• Statutory Authority: RCW 19.27A.045 and chapter 19.27A RCW. WSR 24-16-145, § 51-11C-50500, filed 8/7/24, effective 9/7/24. Statutory Authority: RCW 19.27A.020, 19.27A.025, 19.27A.160 and chapters 19.27A and 19.27 RCW. WSR 22-14-091, 23-12-101, and 23-20-021, § 51-11C-50500, filed 7/1/22, 6/7/23, and 9/25/23, effective 3/15/24. Statutory Authority: RCW 19.27A.020, 19.27A.025, 19.27A.160 and chapter 19.27 RCW. WSR 19-24-040, § 51-11C-50500, filed 11/26/19, effective 7/1/20. Statutory Authority: RCW 19.27A.020, 19.27A.025 and chapters 19.27A and 19.27 RCW. WSR 19-02-089, § 51-11C-50500, filed 1/2/19, effective 7/1/19. Statutory Authority: RCW 19.27A.025, 19.27A.160, and 19.27.074. WSR 16-03-072, § 51-11C-50500, filed 1/19/16, effective 7/1/16.

Wash. Admin. Code § 51-11C-50600 Section C506—Metering for existing buildings.

C506.1 Metering in existing buildings. Where new or replacement systems or equipment are installed in an existing building that was constructed subject to the requirements of this section, metering shall be provided for such new or replacement systems or equipment so that their energy use is included in the corresponding end-use category defined in Section C409.2. This includes systems or equipment added in conjunction with additions or alterations to existing buildings.

C506.1.1 Small existing buildings. Metering and data acquisition systems shall be provided for additions over 25,000 square feet to buildings that were constructed subject to the requirements of this section, in accordance with the requirements of Sections C409.2 and C409.3.

History

• Statutory Authority: RCW 19.27A.045 and chapter 19.27A RCW. WSR 24-16-145, § 51-11C-50600, filed 8/7/24, effective 9/7/24. Statutory Authority: RCW 19.27A.020, 19.27A.025, 19.27A.160 and chapters 19.27A and 19.27 RCW. WSR 22-14-091, 23-12-101, and 23-20-021, § 51-11C-50600, filed 7/1/22, 6/7/23, and 9/25/23, effective 3/15/24.

Wash. Admin. Code § 51-11C-60000 Reserved.

History

• Statutory Authority: RCW 19.27A.020, 19.27A.025, 19.27A.160 and chapters 19.27A, 19.27 RCW. WSR 22-14-091, 23-12-101, and 23-20-021, § 51-11C-60000, filed 7/1/22, 6/7/23, and 9/25/23, effective 3/15/24. Statutory Authority: RCW 19.27A.020, 19.27A.025 and chapters 19.27 and 34.05 RCW. WSR 13-04-056, § 51-11C-60000, filed 2/1/13, effective 7/1/13.

Wash. Admin. Code § 51-11C-600000 Chapter 6 [CE]—Referenced standards.

This chapter lists the standards that are referenced in various sections of this document. The standards are listed herein by the promulgating agency of the standard, the standard identification, the effective date and title, and the section or sections of this document that reference the standard. The application of the referenced standards shall be as specified in Section C106.

| AAMA | American Architectural Manufacturers Association | | | | --- | --- | --- | --- | | | 1827 Walden Office Square | | | | | Suite 550 | | | | | Schaumburg, IL 60173-4268 | | | | Standard reference number | Title | | Referenced in code section number | | AAMA/WDMA/CSA 101/I.S.2/A C440—17 | North American Fenestration Standard/Specifications for Windows, Doors and Unit Skylights | . . . . . . . . | Table C402.4.1.1.2 | | AHAM | Association of Home Appliance Manufacturers | | | | | 1111 19th Street, N.W., Suite 402 | | | | | Washington, D.C. 20036 | | | | Standard reference number | Title | | Referenced in code section number | | ANSI/AHAM RAC-1—2008 | Room Air Conditioners | . . . . . . . . | Table C403.3.2 (4) | | AHAM HRF-1—2017 | Energy, Performance and Capacity of Household Refrigerators, Refrigerator-Freezers and Freezers | . . . . . . . . | Table C410.1(1) | | AHRI | Air Conditioning, Heating, and Refrigeration Institute | | | | | 4100 North Fairfax Drive, Suite 200 | | | | | Arlington, VA 22203 | | | | Standard reference number | Title | | Referenced in code section number | | ISO/AHRI/ASHRAE | | | | | 5801—2017 | Fans - Performance Testing Using Standardized Airways | . . . . . . . . | C403.8.1.1 | | ISO/AHRI/ASHRAE | | | | | 13256-1 (2017) | Water-source Heat Pumps - Testing and Rating for Performance - Part 1: Water-to-air and Brine-to-air Heat Pumps | . . . . . . . . | Table C403.3.2 (14) | | ISO/AHRI/ASHRAE | | | | | 13256-2 (2017) | Water-source Heat Pumps - Testing and Rating for Performance - Part 2: Water-to-water and Brine-to-water Heat Pumps | . . . . . . . . | Table C403.3.2 (14) | | 210/240—2017 and 2023 | Performance Rating of Unitary Air Conditioning and Air-source Heat Pump Equipment | . . . . . . . . | Table C403.3.2(1), Table C403.3.2(2) | | 310/380—2017 | Standard for Packaged Terminal Air Conditioners and Heat Pumps | . . . . . . . . | Table C403.3.2 (4) | | 340/360—2018 | Commercial and Industrial Unitary Air-conditioning and Heat Pump Equipment | . . . . . . . . | Table C403.3.2(1), Table C403.3.2(2) | | 365—2009 | Commercial and Industrial Unitary Air-conditioning Condensing Units | . . . . . . . . | Table C403.3.2(1) | | 390—2015 | Performance Rating of Single Package Vertical Air Conditioners and Heat Pumps | . . . . . . . . | Table C403.3.2 (4) | | 400—2015 | Liquid to Liquid Heat Exchangers with Addendum 2 | . . . . . . . . | C403.3.2 | | 430—2020 | Performance Rating of Central Station Air-Handling Unit Supply Fans | . . . . . . . . | C403.8.1.1 | | 440—19 | Room Fan Coil | . . . . . . . . | C403.8.1.1, C403.10.3 | | 460—05 | Performance Rating Remote Mechanical Draft Air-cooled Refrigerant Condensers | . . . . . . . . | Table C403.3.2 (7) | | 550/590—2018 | Water Chilling Packages Using the Vapor Compression Cycle—with Addenda | . . . . . . . . | C403.3.2.3, Table C403.3.2 (3), Table C403.3.2(15) | | 560—2018 | Absorption Water Chilling and Water-heating Packages | . . . . . . . . | Table C403.3.2 (3) | | 910—2014 | Performance Rating of Indoor Pool Dehumidifiers | . . . . . . . . | Table C403.3.2(11) | | 920—2015 | Performance Rating of DX-Dedicated Outdoor Air System Units | . . . . . . . . | C202, Table C403.3.2 (12), Table C403.3.2 (13) | | 1160—2014 | Performance Rating of Heat Pump Pool Heaters | . . . . . . . . | Table C404.2, C404.11.1 | | 1200—2013 | Performance Rating of Commercial Refrigerated Display Merchandisers and Storage Cabinets | . . . . . . . . | C410.1,Table C410.1(1), Table C410.1(2) | | 1230—2014 | Performance Rating of Variable Refrigerant Flow (VRF) Multi-Split Air-Conditioning and Heat Pump Equipment (with Addendum 1) | . . . . . . . . | Table C403.3.2(9) | | 1250—2014 | Standard for Performance Rating in Walk-in Coolers and Freezers | . . . . . . . . | Table C410.2.1(3) | | AMCA | Air Movement and Control Association International | | | | | 30 West University Drive | | | | | Arlington Heights, IL 60004-1806 | | | | Standard reference number | Title | | Referenced in code section number | | 205—12 | Energy Efficiency Classification for Fans | . . . . . . . . | C403.8.3 | | 208—2018 | Calculation of the Fan Energy Index | . . . . . . . . | C403.8.1.1, C403.8.3 | | 210—2016 | Laboratory Methods of Testing Fans for Certified Aerodynamic Performance Rating | . . . . . . . . | C403.8.1.1 | | 220—19 | Laboratory Methods for Testing Air Curtain Units for Aerodynamic Performance Rating | . . . . . . . . | C402.5.7 | | 230—15 | Laboratory Methods of Testing Air Circulating Fans for Rating and Certification | . . . . . . . . | C403.9 | | 500D—18 | Laboratory Methods for Testing Dampers for Rating | . . . . . . . . | C402.4.5.1, C402.4.5.2 | | ANSI | American National Standards Institute | | | | | 25 West 43rd Street | | | | | Fourth Floor | | | | | New York, NY 10036 | | | | Standard reference number | Title | | Referenced in code section number | | ANSI/AMCA 208-2018 | Calculation of the Fan Energy Index | . . . . . . . . | C403.8.1.1 | | ANSI/AMCA 210-16/ ASHRAE 51-16 | Laboratory Methods of Testing Fans for Certified Aerodynamic Performance Rating | . . . . . . . . | C403.8.1.1 | | ANSI/ASME A17.1—2010 | Safety code for elevators and escalators | . . . . . . . . | C405.12.1 | | ANSI/CTA 2045-A—2018 | Modular Communications Interface for Energy Management | . . . . . . . . | C404.14 | | ANSI/CTA 2045-B—2021 | Modular Communications Interface for Energy Management | . . . . . . . . | C404.14 | | Z21.10.3/CSA 4.3—17 | Gas Water Heaters, Volume III—Storage Water Heaters with Input Ratings Above 75,000 Btu per Hour, Circulating Tank and Instantaneous | . . . . . . . . | Table C404.2 | | Z21.47/CSA 2.3—16 | Gas-fired Central Furnaces | . . . . . . . . | Table C403.3.2 (5) | | Z83.8/CSA 2.6—16 | Gas Unit Heaters, Gas Packaged Heaters, Gas Utility Heaters and Gas-fired Duct Furnaces | . . . . . . . . | Table C403.3.2 (5) | | APSP | The Association of Pool and Spa Professionals | | | | | 2111 Eisenhower Avenue | | | | | Alexandria, VA 22314 | | | | Standard reference number | Title | | Referenced in code section number | | 14—2019 | American National Standards for Portable Electric Spa Efficiency | . . . . . . . . | C404.12 | | ASABE | American Society of Agricultural and Biological Engineers | | | | | 2950 Niles Road | | | | | St. Joseph, MI 49085 | | | | Standard reference number | Title | | Referenced in code section number | | S640—2017 | Quantities and Units of Electromagnetic Radiation for Plants (Photosynthetic Organisms) | . . . . . . . . | C405.3 | | ASHRAE | American Society of Heating, Refrigerating and Air-Conditioning Engineers, Inc. | | | | | 1791 Tullie Circle, N.E. | | | | | Atlanta, GA 30329-2305 | | | | Standard reference number | Title | | Referenced in code section number | | ANSI/ASHRAE/ACCA | | | | | Standard 127-2007 | Method of Testing for Rating Computer and Data Processing Room Unitary Air Conditioners | . . . . . . . . | C403.5 | | Standard 183— RA2017 | Peak Cooling and Heating Load Calculations in Buildings, Except Low-rise Residential Buildings | . . . . . . . . | C403.1.2 | | ASHRAE—2020 | ASHRAE HVAC Systems and Equipment Handbook— 2020 | . . . . . . . . | C403.1.2 | | ISO/AHRI/ASHRAE | | | | | 13256-1 ( 2012) | Water-source Heat Pumps—Testing and Rating for Performance—Part 1: Water-to-air and Brine-to-air Heat Pumps | . . . . . . . . | Table C403.3.2 (14) | | ISO/AHRI/ASHRAE | | | | | 13256-2 (2012) | Water-source Heat Pumps—Testing and Rating for Performance—Part 2: Water-to-water and Brine-to-water Heat Pumps | . . . . . . . . | Table C403.3.2 (14) | | 90.1—2019 | Energy Standard for Buildings Except Low-rise Residential Buildings (ANSI/ASHRAE/IESNA 90.1— 2019)(with addendum af) | . . . . . . . . | Table C402.1.3, Table C402.1.4, C406.2 | | 90.4—2019 | Energy Standard for Data Centers (with Addenda a, b, d, e) | . . . . . . . . | C403.1.3 | | 146—2011 | Testing and Rating Pool Heaters | . . . . . . . . | Table C404.2 | | ASME | American Society of Mechanical Engineers | | | | | Two Park Avenue | | | | | New York, NY 10016-5990 | | | | Standard reference number | Title | | Referenced in code section number | | ASME A17.1/CSA B44—2019 | Safety Code for Elevators and Escalators | . . . . . . . . | C405.9.2 | | BPVC Section IV-2021 | Boiler and Pressure Vessel Code, Section IV—Rules for Construction of Heating Boilers | . . . . . . . . | C404.14 | | BPVC Section X-2021 | Boiler and Pressure Vessel Code, Section X—Fiber-Reinforced Plastic Pressure Vessels | . . . . . . . . | C404.14 | | ASTM | ASTM International | | | | | 100 Barr Harbor Drive | | | | | West Conshohocken, PA | | | | | 19428-2859 | | | | Standard reference number | Title | | Referenced in code section number | | C 90—206A | Specification for Load-bearing Concrete Masonry Units | . . . . . . . . | Table C402.1.3 | | C518—17 | Standard Test Method for Steady-State Thermal Transmission Properties by Means of the Heat Flow Meter Apparatus | . . . . . . . . | Table C403.10.1.1 | | C1363—11 | Standard Test Method for Thermal Performance of Building Materials and Envelope Assemblies by Means of a Hot Box Apparatus | . . . . . . . . | C303.1.4.1, Table C402.1.4 | | C1363—11 | Standard Test Method for Thermal Performance of Building Materials and Envelope Assemblies by Means of a Hot Box Apparatus | . . . . . . . . | C303.1.4.1, Table C402.1.4, C402.2.7 | | C 1371—15 | Standard Test Method for Determination of Emittance of Materials Near Room Temperature Using Portable Emissometers | . . . . . . . . | Table C402.4 | | C 1549—09 | Standard Test Method for Determination of Solar Reflectance Near Ambient Temperature Using A Portable Solar Reflectometer | . . . . . . . . | Table C402.4 | | D 1003—13 | Standard Test Method for Haze and Luminous Transmittance of Transparent Plastics | . . . . . . . . | C402.4.2.2 | | E 283—04 (2012) | Test Method for Determining the Rate of Air Leakage Through Exterior Windows, Curtain Walls and Doors Under Specified Pressure Differences Across the Specimen | . . . . . . . . | C402.5.8 | | E 408—13 | Test Methods for Total Normal Emittance of Surfaces Using Inspection-meter Techniques | . . . . . . . . | Table C402.3 | | E 779—2018 | Standard Test Method for Determining Air Leakage Rate by Fan Pressurization | . . . . . . . . | C402.5.1.2.3 | | E 903—12 | Standard Test Method Solar Absorptance, Reflectance and Transmittance of Materials Using Integrating Spheres (Withdrawn 2005) | . . . . . . . . | Table C402.4 | | E 1677—11 | Standard Specification for an Air-retarder (AR) Material or System for Low-rise Framed Building Walls | . . . . . . . . | C402.5.1.2.2 | | E 1827—2011 (2017) | Standard Test Methods for Determining Airtightness of Building Using an Orifice Blower Door | . . . . . . . . | C402.5.2, C402.5.3 | | E 1918—06 (2015) | Standard Test Method for Measuring Solar Reflectance of Horizontal or Low-sloped Surfaces in the Field | . . . . . . . . | Table C402.4 | | E 1980—11 | Standard Practice for Calculating Solar Reflectance Index of Horizontal and Low-sloped Opaque Surfaces | . . . . . . . . | Table C402.2.1.1 | | E 2178—13 | Standard Test Method for Air Permanence of Building Materials | . . . . . . . . | C402.4 | | E 2357—11 | Standard Test Method for Determining Air Leakage of Air Barrier Assemblies | . . . . . . . . | C402.5.1.2.2 | | F 1281—2017 | Specification for Cross-linked Polyethylene/Aluminum/Cross-linked Polyethylene (PEX-AL_PEX) Pressure Pipe | . . . . . . . . | Table C404.5.2.1 | | CSA | Canadian Standards Association | | | | | 5060 Spectrum Way | | | | | Mississauga, Ontario, Canada L4W 5N6 | | | | Standard reference number | Title | | Referenced in code section number | | AAMA/WDMA/CSA 101/I.S.2/A440—11 | North American Fenestration Standard/Specification for Windows, Doors and Unit Skylights | . . . . . . . . | Table C402.4.2 | | CSA B55.1—2015 | Test Method for Measuring Efficiency and Pressure Loss of DWHR Units | . . . . . . . . | C404.10 | | CSA B55.2—2015 | Drain Water Heat Recovery Units | . . . . . . . . | C404.10 | | CTA | Consumer Technology Association | | | | | 1919 S Eads Street | | | | | Arlington, VA 22202 | | | | Standard reference number | Title | | Referenced in code section number | | ANSI/CTA 2045-A—2018 | Modular Communications Interface for Energy Management | . . . . . . . . | C404.14 | | ANSI/CTA 2045-B—2021 | Modular Communications Interface for Energy Management | . . . . . . . . | C404.14 | | CTI | Cooling Technology Institute | | | | | 2611 FM 1960 West, Suite A-101 | | | | | Houston, TX 77068 | | | | Standard reference number | Title | | Referenced in code section number | | ATC 105—2019 | Acceptance Test Code for Water Cooling Tower | . . . . . . . . | Table C403.3.2(7) | | ATC 105DS—2018 | Acceptance Test Code for Dry Fluid Coolers | . . . . . . . . | Table C403.3.2(7) | | ATC 105S—11 | Acceptance Test Code for Closed Circuit Cooling Towers | . . . . . . . . | Table C403.3.2(7) | | ATC 106—11 | Acceptance Test Code for Mechanical Draft Evaporative Vapor Condensers | . . . . . . . . | Table C403.3.2(7) | | STD 201—17 | Standard for Certification of Water Cooling Towers Thermal Performances | . . . . . . . . | Table C403.3.2(7) | | DASMA | Door and Access Systems Manufacturers Association | | | | | 1300 Sumner Avenue | | | | | Cleveland, OH 44115-2851 | | | | Standard reference number | Title | | Referenced in code section number | | 105—17 | Test Method for Thermal Transmittance and Air Infiltration of Garage Doors | . . . . . . . . | Table C402.4.2 | | DOE | U.S. Department of Energy | | | | | c/o Superintendent of Documents | | | | | U.S. Government Printing Office | | | | | Washington, D.C. 20402-9325 | | | | Standard reference number | Title | | Referenced in code section number | | 10 C.F.R., Part 430—2015 | Energy Conservation Program for Consumer Products: | | | | | Test Procedures and Certification and Enforcement Requirement for Plumbing Products; and Certification and Enforcement Requirements for Residential Appliances; Final Rule | . . . . . . . . | Table C403.3.2(1), Table C403.3.2(2), Table C403.3.2(5), Table C403.3.2(6), Table C403.3.2(14), Table C404.2 | | 10 C.F.R., Part 431—2015 | Energy Efficiency Program for Certain Commercial and Industrial Equipment: Test Procedures and Efficiency Standards; Final Rules | . . . . . . . . | Table C403.3.2(6), C403.8.4, C403.11, Table C403.11, C403.11.2, C405.7, Table C405.7, C405.8, Table C405.8(1), Table C405.8(2), Table C405.8(3) | | HVI | Home Ventilating Institute | | | | | 1740 Dell Range Blvd., Ste. H, PMB 450 | | | | | Cheyenne, WY 82009 | | | | Standard reference number | Title | | Referenced in code section number | | 920—2020 | Product Performance Certification Procedure Including Verification and Challenge | . . . . . . . . | C403.3.5.1, C403.3.6 | | IAPMO | International Association of Plumbing and Mechanical Officials | | | | | 4755 E. Philadelphia Street | | | | | Ontario, CA 91761 | | | | Standard reference number | Title | | Referenced in code section number | | UPC—2021 | Uniform Plumbing Code | . . . . . . . . | C201.3, C501.2 | | ICC | International Code Council, Inc. | | | | | 500 New Jersey Avenue, N.W., | | | | | 6th Floor | | | | | Washington, D.C. 20001 | | | | Standard reference number | Title | | Referenced in code section number | | IBC—21 | International Building Code | . . . . . . . . | C201.3, C303.2, C402.4.3, C501.2 | | ICC 500—2020 | Standard for the Design and Construction of Storm Shelters | . . . . . . . . | C402.4.2 | | IFC—21 | International Fire Code | . . . . . . . . | C201.3, C501.2 | | IFGC—21 | International Fuel Gas Code | . . . . . . . . | C201.3, C501.2 | | IMC—21 | International Mechanical Code | . . . . . . . . | C106.3, C201.3, C402.5.3, C403.2.2.1, C403.2.2.2, C403.3.5, C403.3.5.1, C403.6.1, C403.6.5, C403.6.10, C403.7.1, C403.7.2, C403.7.5, C403.7.5.1, C403.7.6, C403.7.7.3, C403.7.8.1, C403.7.8.4, C403.8.4, C403.8.5.1, Table C403.10.1, C403.10.1.2, Table C403.10.1.2, C403.10.2.2, C403.12, C406.6, C408.2.2.1, C501.2 | | IEEE | The Institute of Electrical and Electronic Engineers, Inc. | | | | | 3 Park Avenue | | | | | New York, NY 10016 | | | | Standard reference number | Title | | Referenced in code section number | | IEEE 515.1—2012 | IEEE Standard for the Testing, Design, Installation and Maintenance of Electrical Resistance Trace Heating for Commercial Applications | . . . . . . . . | C404.6.2 | | IES | Illuminating Engineering Society | | | | | 120 Wall Street, 17th Floor | | | | | New York, NY 10005-4001 | | | | Standard reference number | Title | | Referenced in code section number | | ANSI/ASHRAE/IESNA 90.1—2019 | Energy Standard for Buildings Except Low-rise Residential Buildings | . . . . . . . . | Table C402.1.3, Table C402.1.4, Table C407.5.1 | | ISO | International Organization for Standardization | | | | | 1, rue de Varembe, Case postale 56, CH-1211 | | | | | Geneva, Switzerland | | | | Standard reference number | Title | | Referenced in code section number | | ISO/AHRI/ASHRAE 13256-1 (2017) | Water-Source Heat Pumps—Testing and Rating for Performance—Part 1: Water-to-air and Brine-to-air Heat Pumps | . . . . . . . . | C403.3.2 (14) | | ISO/AHRI/ASHRAE 13256-2 (2017) | Water-Source Heat Pumps—Testing and Rating for Performance—Part 2: Water-to-water and Brine-to-water Heat Pumps | . . . . . . . . | C403.3.2 (14) | | 25745-2:2015 | Energy Performance of Lifts, Escalators and Moving Walks—Part 2: Energy Calculation and Classification for Lifts (Elevators) | . . . . . . . . | C406.2.14 | | NEEA | Northwest Energy Efficiency Alliance | | | | | 421 SW 6th Ave. | | | | | Suite 600 | | | | | Portland, OR 97204 | | | | Standard reference number | Title | | Referenced in code section number | | AWHS Vers. 8.0—2022 | Advanced Water Heating Specification | . . . . . . . . | C404.2.1 | | NEMA | National Electric Manufacturers Association | | | | | 1300 North 17th Street | | | | | Suite 1752 | | | | | Rosslyn, VA 22209 | | | | Standard reference number | Title | | Referenced in code section number | | ANSI/NEMA WD 6-2016 | Wiring Devices—Dimensional Specifications | . . . . . . . . | C405.12 | | MGI—2016 | Motors and Generators | . . . . . . . . | C202 | | TP-1-2002 | Guide for Determining Energy Efficiency for Distribution Transformers | . . . . . . . . | C405.9 | | NFRC | National Fenestration Rating Council, Inc. | | | | | 6305 Ivy Lane, Suite 140 | | | | | Greenbelt, MD 20770 | | | | Standard reference number | Title | | Referenced in code section number | | 100—2020 | Procedure for Determining Fenestration Product U-factors | . . . . . . . . | C303.1.2, C402.2.2 | | 200—2020 | Procedure for Determining Fenestration Product Solar Heat Gain Coefficients and Visible Transmittance at Normal Incidence | . . . . . . . . | C303.1.3, C402.4.1.1 | | 202—2017 | Procedure for Determining Fenestration Product Visible Transmittance at Normal Incidence | . . . . . . . . | C202 | | NFRC 203—2017 | Procedure for Determining Visible Transmittance of Tubular Daylighting Devices | . . . . . . . . | C202, C402.4.2 | | 400—2017 | Procedure for Determining Fenestration Product Air Leakage | . . . . . . . . | Table C402.4.2 | | SMACNA | Sheet Metal and Air Conditioning Contractors National Association, Inc. | | | | | 4021 Lafayette Center Drive | | | | | Chantilly, VA 20151-1209 | | | | Standard reference number | Title | | Referenced in code section number | | SMACNA—2012 | HVAC Air Duct Leakage Test Manual | . . . . . . . . | C403.10.2.3 | | UL | Underwriters Laboratories | | | | | 333 Pfingsten Road | | | | | Northbrook, IL 60062-2096 | | | | Standard reference number | Title | | Referenced in code section number | | 710—12 | Exhaust Hoods for Commercial Cooking Equipment | . . . . . . . . | C403.7.5 | | 727—18 | Oil-fired Central Furnaces—with Revisions through April 2010 | . . . . . . . . | Table C403.3.2(4), Table C403.3.2(5) | | 731—18 | Oil-fired Unit Heaters—with Revisions through April 2010 | . . . . . . . . | Table C403.3.2(5) | | US-FTC | United States-Federal Trade Commission | | | | | 600 Pennsylvania Avenue N.W. | | | | | Washington, D.C. 20580 | | | | Standard reference number | Title | | Referenced in code section number | | C.F.R. Title 16 (2015) | R-value Rule | . . . . . . . . | C303.1.4 | | WDMA | Window and Door Manufacturers Association | | | | | 1400 East Touhy Avenue, Suite 470 | | | | | Des Plaines, IL 60018 | | | | Standard reference number | Title | | Referenced in code section number | | AAMA/WDMA/CSA 101/I.S.2/A440—17 | North American Fenestration Standard/Specification for Windows, Doors and Unit Skylights | . . . . . . . . | Table C402.4.2 |

Reviser's note: The brackets and enclosed material in the text of the above section occurred in the copy filed by the agency.

Wash. Admin. Code § 51-11C-61000 Appendix A—Default heat loss coefficients.

History

• Statutory Authority: RCW 19.27A.020, 19.27A.025, 19.27A.160 and chapters 19.27A and 19.27 RCW. WSR 22-14-091, 23-12-101, and 23-20-021, § 51-11C-61000, filed 7/1/22, 6/7/23, and 9/25/23, effective 3/15/24.

Wash. Admin. Code § 51-11C-61010 Section A101—General.

History

• Statutory Authority: RCW 19.27A.020, 19.27A.025 and chapters 19.27 and 34.05 RCW. WSR 13-04-056, § 51-11C-61010, filed 2/1/13, effective 7/1/13.

Wash. Admin. Code § 51-11C-61011 Section A101.1—Scope.

A101.1 Scope. The following defaults shall apply to Chapter 4 of both the (RE) and (CE) sections of the WSEC. This chapter includes tables of seasonal average heat loss coefficients for specified nominal insulation.

History

• Statutory Authority: RCW 19.27A.025, 19.27A.160, and 19.27.074. WSR 16-03-072, § 51-11C-61011, filed 1/19/16, effective 7/1/16. Statutory Authority: RCW 19.27A.020, 19.27A.025 and chapters 19.27 and 34.05 RCW. WSR 13-04-056, § 51-11C-61011, filed 2/1/13, effective 7/1/13.

Wash. Admin. Code § 51-11C-61012 Section A101.2—Description.

A101.2 Description. These coefficients were developed primarily from data and procedures from the ASHRAE Fundamentals Handbook.

Coefficients not contained in this chapter may be computed using the procedures listed in this reference if the assumptions in the following sections are used, along with data from the sources referenced above.

History

• Statutory Authority: RCW 19.27A.020, 19.27A.025 and chapters 19.27 and 34.05 RCW. WSR 13-04-056, § 51-11C-61012, filed 2/1/13, effective 7/1/13.

Wash. Admin. Code § 51-11C-61013 Section A101.3—Air films.

A101.3 Air films. Default R-values used for air films shall be as follows:

| R-Value | Condition | | --- | --- | | 0.17 | All exterior surfaces | | 0.61 | Interior horizontal surfaces, heat flow up | | 0.92 | Interior horizontal surfaces, heat flow down | | 0.68 | Interior vertical surfaces |

History

• Statutory Authority: RCW 19.27A.020, 19.27A.025 and chapters 19.27 and 34.05 RCW. WSR 13-04-056, § 51-11C-61013, filed 2/1/13, effective 7/1/13.

Wash. Admin. Code § 51-11C-61014 Section A101.4—Compression of insulation.

A101.4 Compression of insulation. Insulation which is compressed shall be rated in accordance with Table A101.4 or reduction in value may be calculated in accordance with the procedures in the ASHRAE Fundamentals Handbook.

Table A101.4

R-value of Fiberglass Batts Compressed Within Various Depth Cavities

| Insulation R-Values at Standard Thickness | | | | | | | | | | | | | | | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | | Rated R-Value | 82 | 71 | 60 | 49 | 38 | 30 | 22 | 21 | 19 | 15 | 13 | 11 | | | Standard Thickness, Inches | 26.0 | 22.5 | 19.0 | 15.5 | 12 | 9.5 | 6.5 | 5.5 | 6 | 3.5 | 3.5 | 3.5 | | | Nominal Lumber Sizes, Inches | Actual Depth of Cavity, Inches | Insulation R-Values when Installed in a Confined Cavity | | | | | | | | | | | | | Truss | 26.0 | 82 | — | — | — | — | — | — | — | — | — | — | — | | Truss | 22.5 | — | 71 | — | — | — | — | — | — | — | — | — | — | | Truss | 19.0 | — | — | 60 | — | — | — | — | — | — | — | — | — | | Truss | 15.5 | — | — | — | 49 | — | — | — | — | — | — | — | — | | Truss | 12.0 | — | — | — | — | 38 | — | — | — | — | — | — | — | | 2 x 12 | 11.25 | — | — | — | — | 37 | — | — | — | — | — | — | — | | 2 x 10 | 9.25 | — | — | — | — | 32 | 30 | — | — | — | — | — | — | | 2 x 8 | 7.25 | — | — | — | — | 27 | 26 | 22 | 21 | 19 | — | — | — | | 2 x 6 | 5.5 | — | — | — | — | — | 21 | 20 | 21 | 18 | — | — | — | | 2 x 4 | 3.5 | — | — | — | — | — | — | 14 | — | 13 | 15 | 13 | 11 | | | 2.5 | — | — | — | — | — | — | — | — | — | — | 9.8 | — | | | 1.5 | — | — | — | — | — | — | — | — | — | — | 6.3 | 6.0 |

History

• Statutory Authority: RCW 19.27A.020, 19.27A.025 and chapters 19.27 and 34.05 RCW. WSR 13-04-056, § 51-11C-61014, filed 2/1/13, effective 7/1/13.

Wash. Admin. Code § 51-11C-61015 Section A101.5—Building materials.

A101.5 Building materials. Default R-values used for building materials shall be as shown in Table A101.5.

Table A101.5

Default R-values for Building Materials

| Material | Nominal Size (in.) | Actual Size (in.) | R-Value (Heat Capacityc) | | --- | --- | --- | --- | | Air cavity (unventilated), between metal studs at 16 inches on centera | - | - | 0.79 | | Air cavity (unventilated), all other depths and framing materials1 | - | - | 0.91 | | Airfilm, exterior surfacesb | - | - | 0.17 | | Airfilm, interior horizontal surfaces, heat flow upb | - | - | 0.61 | | Airfilm, interior horizontal surfaces, heat flow downb | - | - | 0.92 | | Airfilm, interior vertical surfacesb | - | - | 0.68 | | Brick at R-0.12/in. (face brick, 75% solid/25% core area, 130 lbs/ft3) | 4 | 3.5 | 0.32 (5.9) | | Carpet and rubber pad | - | - | 1.23 | | Concretec at R-0.0625/in., heavyweight (144 lbs/ft3) | - | 2 | 0.13 (HC-4.8) | | | - | 4 | 0.25 (HC-9.6) | | | - | 6 | 0.38 (HC-14.4) | | | - | 8 | 0.50 (HC-19.2) | | | - | 10 | 0.63 (HC-24.0) | | | - | 12 | 0.75 (HC-28.8) | | Concrete masonry units, solid grouted, lightweight (95 lbs/ft3) | 6 | - | 0.80 (HC-11.4) | | Concrete masonry units, solid grouted, normal weight (135 lbs/ft3) | 6 | - | 0.51 (HC-13.2) | | Concrete masonry units, partly grouted, lightweight (95 lbs/ft3) | 6 | - | 1.33 (HC-6.7) | | Concrete masonry units, partly grouted, normal weight (135 lbs/ft3) | 6 | - | 0.82 (HC-9.0) | | Concrete masonry units, solid grouted, lightweight (95 lbs/ft3) | 8 | - | 1.05 (HC-15.5) | | Concrete masonry units, solid grouted, normal weight (135 lbs/ft3) | 8 | - | 0.69 (HC-17.9) | | Concrete masonry units, partly grouted, lightweight (95 lbs/ft3) | 8 | - | 1.44 (HC-9.6) | | Concrete masonry units, partly grouted, normal weight (135 lbs/ft3) | 8 | - | 0.98 (HC-12.0) | | Concrete masonry units, solid grouted, lightweight (95 lbs/ft3) | 10 | - | 1.30 (HC-19.7) | | Concrete masonry units, solid grouted, normal weight (135 lbs/ft3) | 10 | - | 0.87 (HC-22.6) | | Concrete masonry units, partly grouted, lightweight (95 lbs/ft3) | 10 | - | 1.61 (HC-11.9) | | Concrete masonry units, partly grouted, normal weight (135 lbs/ft3) | 10 | - | 1.11 (HC-14.8) | | Concrete masonry units, solid grouted, lightweight (95 lbs/ft3) | 12 | - | 1.53 (HC-23.9) | | Concrete masonry units, solid grouted, normal weight (135 lbs/ft3) | 12 | - | 1.06 (HC-27.2) | | Concrete masonry units, partly grouted, lightweight (95 lbs/ft3) | 12 | - | 1.75 (HC-14.2) | | Concrete masonry units, partly grouted, normal weight (135 lbs/ft3) | 12 | - | 1.23 (HC-17.5) | | Flooring, wood subfloor | - | 0.75 | 0.94 | | Gypsum board | - | 0.5 | 0.45 | | | - | 0.625 | 0.56 | | Metal deck | - | - | 0 | | Roofing, built-up | - | 0.375 | 0.33 | | Sheathing, vegetable fiber board, 0.78 in. | - | 0.78 | 2.06 | | Soil at R-0.104/in. | - | 12 | 1.25 | | Steel, mild | | 1 | 0.0031807 | | Stucco | - | 0.75 | 0.08 |

| a | There is no credit for cavities that are open to outside air. | | --- | --- | | b | Air films do not apply to air cavities within an assembly. | | c | For heat capacity for concrete and concrete masonry materials with densities other than the values listed in Table A101.5, see Tables A103.3.7.1 (1) through (3) or Tables A3.1B and A3.1C in ASHRAE/IESNA Standard 90.1. |

History

• Statutory Authority: RCW 19.27A.025, 19.27A.045, 19.27A.160 and 19.27.074. WSR 16-13-088, § 51-11C-61015, filed 6/15/16, effective 7/16/16. Statutory Authority: RCW 19.27A.025, 19.27A.160, and 19.27.074. WSR 16-03-072, § 51-11C-61015, filed 1/19/16, effective 7/1/16. Statutory Authority: RCW 19.27A.020, 19.27A.025 and chapters 19.27 and 34.05 RCW. WSR 13-04-056, § 51-11C-61015, filed 2/1/13, effective 7/1/13.

Wash. Admin. Code § 51-11C-61020 Section A102—Ceilings.

History

• Statutory Authority: RCW 19.27A.020, 19.27A.025 and chapters 19.27 and 34.05 RCW. WSR 13-04-056, § 51-11C-61020, filed 2/1/13, effective 7/1/13.

Wash. Admin. Code § 51-11C-61021 Section A102.1—General.

A102.1 General. Table A102.1 lists heat loss coefficients for the opaque portion of exterior ceilings below vented attics, vaulted ceilings and roof decks in units of Btu/h • ft2 • °F of ceiling.

They are derived from procedures listed in the ASHRAE Fundamentals Handbook. Ceiling U-factors are modified for the buffering effect of the attic, assuming an indoor temperature of 65°F and an outdoor temperature of 45°F.

A102.1.1 Metal framed ceilings. The nominal R-values in Table A103.3.6.2: Effective R-Values for Metal Framing and Cavity Only may be used for purposes of calculating metal framed ceiling section U-factors in lieu of the ASHRAE zone calculation method as provided in Chapter 27 of the ASHRAE Fundamentals Handbook.

Metal building roofs have a different construction and are addressed in Table A102.2.5.

History

• Statutory Authority: RCW 19.27A.020, 19.27A.025 and chapters 19.27 and 34.05 RCW. WSR 13-04-056, § 51-11C-61021, filed 2/1/13, effective 7/1/13.

Wash. Admin. Code § 51-11C-610211 Table A102.1—Default U-factors for ceilings.

Table A102.1

Default U-factors for Ceilings

| | Standard Frame | Advanced Frame | | | | --- | --- | --- | --- | --- | | Ceilings Below Vented Attics | | | | | | Flat | Baffled | | | | | | R-19 | 0.049 | 0.047 | | | | R-30 | 0.036 | 0.032 | | | | R-38 | 0.031 | 0.026 | | | | R-49 | 0.027 | 0.020 | | | | R-60 | 0.025 | 0.017 | | | Scissors Truss | | | | | | | R-30 (4/12 roof pitch) | 0.043 | 0.031 | | | | R-38 (4/12 roof pitch) | 0.040 | 0.025 | | | | R-49 (4/12 roof pitch) | 0.038 | 0.020 | | | | R-30 (5/12 roof pitch) | 0.039 | 0.032 | | | | R-38 (5/12 roof pitch) | 0.035 | 0.026 | | | | R-49 (5/12 roof pitch) | 0.032 | 0.020 | | | Vaulted Ceilings | 16" O.C. | 24" O.C. | | | | | Vented | | | | | | R-19 2x10 joist | 0.049 | 0.048 | | | | R-30 2x12 joist | 0.034 | 0.033 | | | | R-38 2x14 joist | 0.027 | 0.027 | | | | Unvented | | | | | | R-30 2x10 joist | 0.034 | 0.033 | | | | R-38 2x12 joist | 0.029 | 0.027 | | | | R-21 + R-21 2x12 joist | 0.026 | 0.025 | | | Roof Deck | 4 x Beams, 48" O.C. | | | | | R-12.5 | 2" | Rigid insulation | 0.064 | | | R-21.9 | 3.5" | Rigid insulation | 0.040 | | | R-37.5 | 6" | Rigid insulation | 0.025 | | | R-50 | 8" | Rigid insulation | 0.019 | |

History

• Statutory Authority: RCW 19.27A.020, 19.27A.025 and chapters 19.27 and 34.05 RCW. WSR 13-04-056, § 51-11C-610211, filed 2/1/13, effective 7/1/13.

Wash. Admin. Code § 51-11C-61022 Section A102.2—Component description.

A102.2 Component description. The four types of ceilings are characterized as follows:

A102.2.1 Ceilings below a vented attic. Attic insulation is assumed to be blown-in, loose-fill fiberglass with a K-value of 2.6 h • ft2 • °F/Btu per inch. Full bag count for specified R-value is assumed in all cases. Ceiling dimensions for flat ceiling calculations are 45 by 30 feet, with a gabled roof having a 4/12 pitch. The attic is assumed to vent naturally at the rate of 3 air changes per hour through soffit and ridge vents. A void fraction of 0.002 is assumed for all attics with insulation baffles. Standard-framed, unbaffled attics assume a void fraction of 0.008.

Attic framing is either standard or advanced. Standard framing assumes tapering of insulation depth around the perimeter with resultant decrease in thermal resistance. An increased R-value is assumed in the center of the ceiling due to the effect of piling leftover insulation. Advanced framing assumes full and even depth of insulation extending to the outside edge of exterior walls. Advanced framing does not change from the default value.

U-factors for flat ceilings below vented attics with standard framing may be modified with the following table:

| | U-Factor for Standard Framing | | | | --- | --- | --- | --- | | Roof Pitch | R-30 | R-38 | | | 4/12 | | 0.036 | 0.031 | | 5/12 | | 0.035 | 0.030 | | 6/12 | | 0.034 | 0.029 | | 7/12 | | 0.034 | 0.029 | | 8/12 | | 0.034 | 0.028 | | 9/12 | | 0.034 | 0.028 | | 10/12 | | 0.033 | 0.028 | | 11/12 | | 0.033 | 0.027 | | 12/12 | | 0.033 | 0.027 |

Vented scissors truss attics assume a ceiling pitch of 2/12 with a roof pitch of either 4/12 or 5/12. Unbaffled standard framed scissors truss attics are assumed to have a void fraction of 0.016.

A102.2.2 Vaulted ceilings. Insulation is assumed to be fiberglass batts installed in roof joist cavities. In the vented case, at least 1.5 inches between the top of the batts and the underside of the roof sheathing is left open for ventilation in each cavity. A ventilation rate of 3.0 air changes per hour is assumed. In the unvented or dense pack case, the ceiling cavity is assumed to be fully packed with insulation, leaving no space for ventilation.

A102.2.3 Roof decks. Rigid insulation is applied to the top of roof decking with no space left for ventilation. Roofing materials are attached directly on top of the insulation. Framing members are often left exposed on the interior side.

A102.2.4 Metal truss framing. Overall system tested values for the roof/ceiling Uo for metal framed truss assemblies from approved laboratories shall be used, when such data is acceptable to the building official.

Alternatively, the Uo for roof/ceiling assemblies using metal truss framing may be obtained from Tables A102.2.4(1) through A102.2.4(5).

A102.2.5 Metal building roof. Table A102.2.5: The base assembly is a roof where the insulation is compressed when installed beneath metal roof panels attached to the steel structure (purlins). Additional assemblies include continuous insulation, uncompressed and uninterrupted by framing.

U-factors for metal building roofs shall be taken from Table A102.2.5, provided the average purlin spacing is at least 52 inches and the R-value of the thermal spacer block is greater than or equal to the thermal spacer block R-value indicated in Table A107.2.5 for the assembly. It is not acceptable to use the U-factors in Tables A102.2.6(1), A102.2.6(2) and A102.2.6(3) if additional insulated sheathing is not continuous.

A102.2.5.1 Single layer. The rated R-value of insulation is for insulation installed perpendicular to and draped over purlins and then compressed when the metal roof panels are attached. A minimum R-3 (R-0.5) thermal spacer block between the purlins and the metal roof panels is required, unless compliance is shown by the overall assembly U-factor.

A102.2.5.2 Double layer. The first rated R-value of insulation is for insulation installed perpendicular to and draped over purlins. The second rated R-value of insulation is for unfaced insulation installed above the first layer and parallel to the purlins and then compressed when the metal roof panels are attached. A minimum R-3 (R-0.5) thermal spacer block between the purlins and the metal roof panels is required, unless compliance is shown by the overall assembly U-factor.

A102.2.5.3 Continuous insulation. For continuous insulation (e.g., insulation boards or blankets), it is assumed that the insulation is installed below the purlins and is uninterrupted by framing members. Insulation exposed to the conditioned space or semi-heated space shall have a facing, and all insulation seams shall be continuously sealed to provide a continuous air barrier.

A102.2.5.4 Liner system (Ls). A continuous membrane is installed below the purlins and uninterrupted by framing members. Uncompressed, unfaced insulation rests on top of the membrane between the purlins. For multilayer installations, the last rated R-value of insulation is for unfaced insulation draped over purlins and then compressed when the metal roof panels are attached. A minimum R-3 (R-0.5) thermal spacer block between the purlins and the metal roof panels is required, unless compliance is shown by the overall assembly U-factor.

A102.2.5.5 Filled cavity. The first rated R-value of insulation is for faced insulation installed parallel to the purlins. The second rated R-value of insulation is for unfaced insulation installed above the first layer, parallel to and between the purlins and compressed when the metal roof panels are attached. The facer of the first layer of insulation is of sufficient width to be continuously sealed to the top flange of the purlins and to accommodate the full thickness of the second layer of insulation. A supporting structure retains the bottom of the first layer at the prescribed depth required for the full thickness of the second layer of insulation being installed above it. A minimum R-5 (R-0.9) thermal spacer block between the purlins and the metal roof panels is required, unless compliance is shown by the overall assembly U-factor.

A102.2.6 Roofs with insulation entirely above deck (uninterrupted by framing). Tables A102.2.6(1) through A102.2.6(3): The base assembly is continuous insulation over a structural deck. These tables indicate effective U-factors for tapered roof insulation, sloped from a maximum R-value (Rmax) at the peak of the slope to a minimum R-value (Rmin) at the low point of the slope. The rows of the tables represent the rated R-value of the insulation at the minimum conditions (except at roof drains) and the columns of the table represent the rated R-value of the insulation at the maximum conditions. The slope of the tapered insulation shall be no greater than 1/4 inch per foot.

History

• Statutory Authority: RCW 19.27A.025, 19.27A.160, and 19.27.074. WSR 16-03-072, § 51-11C-61022, filed 1/19/16, effective 7/1/16. Statutory Authority: RCW 19.27A.020, 19.27A.025 and chapters 19.27 and 34.05 RCW. WSR 13-04-056, § 51-11C-61022, filed 2/1/13, effective 7/1/13.

Wash. Admin. Code § 51-11C-610221 Tables A102.2.4—Steel truss framed ceiling Uo values.

Table A102.2.4(1)

Steel Trussa Framed Ceiling Uo

| Cavity | | | | | | Truss Span (ft) | | | | | | | | | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | | R-value | 12 | 14 | 16 | 18 | 20 | 22 | 24 | 26 | 28 | 30 | 32 | 34 | 36 | | 19 | 0.1075 | 0.0991 | 0.0928 | 0.0878 | 0.0839 | 0.0807 | 0.0780 | 0.0757 | 0.0737 | 0.0720 | 0.0706 | 0.0693 | 0.0681 | | 30 | 0.0907 | 0.0823 | 0.0760 | 0.0710 | 0.0671 | 0.0638 | 0.0612 | 0.0589 | 0.0569 | 0.0552 | 0.0538 | 0.0525 | 0.0513 | | 38 | 0.0844 | 0.0759 | 0.0696 | 0.0647 | 0.0607 | 0.0575 | 0.0548 | 0.0525 | 0.0506 | 0.0489 | 0.0474 | 0.0461 | 0.0449 | | 49 | 0.0789 | 0.0704 | 0.0641 | 0.0592 | 0.0552 | 0.0520 | 0.0493 | 0.0470 | 0.0451 | 0.0434 | 0.0419 | 0.0406 | 0.0395 |

Table A102.2.4(2)

Steel Trussa Framed Ceiling Uo with R-3 Sheathing

| Cavity | | | | | | Truss Span (ft) | | | | | | | | | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | | R-value | 12 | 14 | 16 | 18 | 20 | 22 | 24 | 26 | 28 | 30 | 32 | 34 | 36 | | 19 | 0.0809 | 0.0763 | 0.0728 | 0.0701 | 0.0679 | 0.0661 | 0.0647 | 0.0634 | 0.0623 | 0.0614 | 0.0606 | 0.0599 | 0.0592 | | 30 | 0.0641 | 0.0595 | 0.0560 | 0.0533 | 0.0511 | 0.0493 | 0.0478 | 0.0466 | 0.0455 | 0.0446 | 0.0438 | 0.0431 | 0.0424 | | 38 | 0.0577 | 0.0531 | 0.0496 | 0.0469 | 0.0447 | 0.0430 | 0.0415 | 0.0402 | 0.0392 | 0.0382 | 0.0374 | 0.0367 | 0.0361 | | 49 | 0.0523 | 0.0476 | 0.0441 | 0.0414 | 0.0393 | 0.0375 | 0.0360 | 0.0348 | 0.0337 | 0.0328 | 0.0319 | 0.0312 | 0.0306 |

Table A102.2.4(3)

Steel Trussa Framed Ceiling Uo with R-5 Sheathing

| Cavity | | | | | | Truss Span (ft) | | | | | | | | | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | | R-value | 12 | 14 | 16 | 18 | 20 | 22 | 24 | 26 | 28 | 30 | 32 | 34 | 36 | | 19 | 0.0732 | 0.0697 | 0.0670 | 0.0649 | 0.0633 | 0.0619 | 0.0608 | 0.0598 | 0.0590 | 0.0583 | 0.0577 | 0.0571 | 0.0567 | | 30 | 0.0564 | 0.0529 | 0.0502 | 0.0481 | 0.0465 | 0.0451 | 0.0440 | 0.0430 | 0.0422 | 0.0415 | 0.0409 | 0.0403 | 0.0399 | | 38 | 0.0501 | 0.0465 | 0.0438 | 0.0418 | 0.0401 | 0.0388 | 0.0376 | 0.0367 | 0.0359 | 0.0351 | 0.0345 | 0.0340 | 0.0335 | | 49 | 0.0446 | 0.0410 | 0.0384 | 0.0363 | 0.0346 | 0.0333 | 0.0322 | 0.0312 | 0.0304 | 0.0297 | 0.0291 | 0.0285 | 0.0280 |

Table A102.2.4(4)

Steel Trussa Framed Ceiling Uo with R-10 Sheathing

| Cavity | | | | | | Truss Span (ft) | | | | | | | | | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | | R-value | 12 | 14 | 16 | 18 | 20 | 22 | 24 | 26 | 28 | 30 | 32 | 34 | 36 | | 19 | 0.0626 | 0.0606 | 0.0590 | 0.0578 | 0.0569 | 0.0561 | 0.0555 | 0.0549 | 0.0545 | 0.0541 | 0.0537 | 0.0534 | 0.0531 | | 30 | 0.0458 | 0.0437 | 0.0422 | 0.0410 | 0.0401 | 0.0393 | 0.0387 | 0.0381 | 0.0377 | 0.0373 | 0.0369 | 0.0366 | 0.0363 | | 38 | 0.0394 | 0.0374 | 0.0359 | 0.0347 | 0.0337 | 0.0330 | 0.0323 | 0.0318 | 0.0313 | 0.0309 | 0.0305 | 0.0302 | 0.0299 | | 49 | 0.0339 | 0.0319 | 0.0304 | 0.0292 | 0.0283 | 0.0275 | 0.0268 | 0.0263 | 0.0258 | 0.0254 | 0.0251 | 0.0247 | 0.0245 |

Table A102.2.4(5)

Steel Trussa Framed Ceiling Uo with R-15 Sheathing

| Cavity | | | | | | Truss Span (ft) | | | | | | | | | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | | R-value | 12 | 14 | 16 | 18 | 20 | 22 | 24 | 26 | 28 | 30 | 32 | 34 | 36 | | 19 | 0.0561 | 0.0550 | 0.0541 | 0.0535 | 0.0530 | 0.0526 | 0.0522 | 0.0519 | 0.0517 | 0.0515 | 0.0513 | 0.0511 | 0.0509 | | 30 | 0.0393 | 0.0382 | 0.0373 | 0.0367 | 0.0362 | 0.0358 | 0.0354 | 0.0351 | 0.0349 | 0.0347 | 0.0345 | 0.0343 | 0.0341 | | 38 | 0.0329 | 0.0318 | 0.0310 | 0.0303 | 0.0298 | 0.0294 | 0.0291 | 0.0288 | 0.0285 | 0.0283 | 0.0281 | 0.0279 | 0.0278 | | 49 | 0.0274 | 0.0263 | 0.0255 | 0.0249 | 0.0244 | 0.0239 | 0.0236 | 0.0233 | 0.0230 | 0.0228 | 0.0226 | 0.0225 | 0.0223 |

| | Footnotes for Tables A102.2.4(1) through A102.2.4(5) | | --- | --- | | a | Assembly values based on 24 inch on center truss spacing; 11 Truss member connections penetrating insulation (4 at the eaves, 7 in the interior space); 1/2 inch drywall ceiling; all truss members are 2x4 "C" channels with a solid web. | | b | Ceiling sheathing installed between bottom chord and drywall. |

History

• Statutory Authority: RCW 19.27A.020, 19.27A.025 and chapters 19.27 and 34.05 RCW. WSR 13-04-056, § 51-11C-610221, filed 2/1/13, effective 7/1/13.

Wash. Admin. Code § 51-11C-610225 Tables A102.2.5—Default U-factors for metal building roofs.

Table A102.2.5

Default U-factors for Metal Building Roofs

| | | | Overall U-Factor for Assembly of Base Roof Plus Continuous Insulation (uninterrupted by framing) Rated R-Value of Continuous Insulation | | | | | | | --- | --- | --- | --- | --- | --- | --- | --- | --- | | Insulation System | Rated R-Value of Insulation | Overall U-Factor for Entire Base Roof Assembly | R-6.5 | R-13 | R-19.5 | R-26 | R-32.5 | R-39 | | Standing Seam Roofs with Thermal Spacer Blocksa, b | | | | | | | | | | | None | 1.280 | 0.137 | 0.073 | 0.049 | 0.037 | 0.030 | 0.025 | | | R-10 | 0.115 | 0.066 | 0.046 | 0.035 | 0.029 | 0.024 | 0.021 | | Single | R-11 | 0.107 | 0.063 | 0.045 | 0.035 | 0.028 | 0.024 | 0.021 | | Layer | R-13 | 0.101 | 0.061 | 0.044 | 0.034 | 0.028 | 0.024 | 0.020 | | | R-16 | 0.096 | 0.059 | 0.043 | 0.033 | 0.027 | 0.023 | 0.020 | | | R-19 | 0.082 | 0.053 | 0.040 | 0.031 | 0.026 | 0.022 | 0.020 | | | R-10 + R-10 | 0.088 | 0.056 | 0.041 | 0.032 | 0.027 | 0.023 | 0.020 | | | R-10 + R-11 | 0.086 | 0.055 | 0.041 | 0.032 | 0.027 | 0.023 | 0.020 | | | R-11 + R-11 | 0.085 | 0.055 | 0.040 | 0.032 | 0.026 | 0.023 | 0.020 | | | R-10 + R-13 | 0.084 | 0.054 | 0.040 | 0.032 | 0.026 | 0.023 | 0.020 | | Double | R-11 + R-13 | 0.082 | 0.053 | 0.040 | 0.032 | 0.026 | 0.022 | 0.020 | | Layer | R-13 + R-13 | 0.075 | 0.050 | 0.038 | 0.030 | 0.025 | 0.022 | 0.019 | | | R-10 + R-19 | 0.074 | 0.050 | 0.038 | 0.030 | 0.025 | 0.022 | 0.019 | | | R-11 + R-19 | 0.072 | 0.049 | 0.037 | 0.030 | 0.025 | 0.022 | 0.019 | | | R-13 + R-19 | 0.068 | 0.047 | 0.036 | 0.029 | 0.025 | 0.021 | 0.019 | | | R-16 + R-19 | 0.065 | 0.046 | 0.035 | 0.029 | 0.024 | 0.021 | 0.018 | | | R-19 + R-19 | 0.060 | 0.043 | 0.034 | 0.028 | 0.023 | 0.020 | 0.018 | | Liner | R-19 + R-11 | 0.035 | | | | | | | | System | R-25 + R-11 | 0.031 | | | | | | | | | R-30 + R-11 | 0.029 | | | | | | | | | R-25 + R-11 + R-11 | 0.026 | | | | | | | | Filled Cavity with Thermal Spacer Blocksc | | | | | | | | | | | R-10 + R-19 | 0.057 | 0.042 | 0.033 | 0.027 | 0.023 | 0.020 | 0.018 | | Standing Seam Roofs without Thermal Spacer Blocks | | | | | | | | | | Liner System | R-19 + R-11 | 0.040 | | | | | | | | Thru-Fastened Roofs without Thermal Spacer Blocks | | | | | | | | | | Single | R-10 | 0.184 | | | | | | | | Layer | R-11 | 0.182 | | | | | | | | | R-13 | 0.174 | | | | | | | | | R-16 | 0.157 | | | | | | | | | R-19 | 0.151 | | | | | | | | Liner System | R-19 + R-11 | 0.044 | | | | | | |

| | (Multiple R-values are listed in order from inside to outside) | | --- | --- | | a | A standing seam roof clip that provides a minimum 1.5 inch distance between the top of the purlins and the underside of the metal roof panels is required. | | b | A minimum R-3 thermal spacer block is required. | | c | A minimum R-5 thermal spacer block is required. |

History

• Statutory Authority: RCW 19.27A.020, 19.27A.025 and chapters 19.27 and 34.05 RCW. WSR 13-04-056, § 51-11C-610225, filed 2/1/13, effective 7/1/13.

Wash. Admin. Code § 51-11C-610226 Tables A102.2.6—Assembly U-factors for roofs with insulation entirely above deck.

Table A102.2.6(1)

Assembly U-factors for Roofs with Tapered Insulation Entirely Above Deck Single Slope Rectangular to One-sided,e,f,g,h

(Uninterrupted by Framing)

| | | --- |

| | Rated R-value of Insulation at Maximum Condition (Rmaxc) | | | | | | | | | | | | | | | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | | 1 | 5 | 10 | 15 | 20 | 25 | 30 | 35 | 40 | 45 | 50 | 55 | 60 | | | | Rated R-value of insulation at a Minimum Condition (Rminb) | 1 | 0.562 | 0.306 | 0.213 | 0.168 | 0.140 | 0.121 | 0.107 | 0.097 | 0.088 | 0.081 | 0.075 | 0.070 | 0.066 | | 5 | - | 0.173 | 0.125 | 0.101 | 0.086 | 0.076 | 0.068 | 0.062 | 0.057 | 0.053 | 0.049 | 0.046 | 0.044 | | | 10 | - | - | 0.093 | 0.076 | 0.066 | 0.058 | 0.053 | 0.048 | 0.045 | 0.042 | 0.039 | 0.037 | 0.035 | | | 15 | - | - | - | 0.063 | 0.055 | 0.049 | 0.045 | 0.041 | 0.038 | 0.036 | 0.034 | 0.032 | 0.030 | | | 20 | - | - | - | - | 0.048 | 0.043 | 0.039 | 0.036 | 0.034 | 0.032 | 0.030 | 0.028 | 0.027 | | | 25 | - | - | - | - | - | 0.039 | 0.035 | 0.033 | 0.031 | 0.029 | 0.027 | 0.026 | 0.025 | | | 30 | - | - | - | - | - | - | 0.032 | 0.030 | 0.028 | 0.026 | 0.025 | 0.024 | 0.023 | | | 35 | - | - | - | - | - | - | - | 0.028 | 0.026 | 0.025 | 0.023 | 0.022 | 0.021 | | | 40 | - | - | - | - | - | - | - | - | 0.025 | 0.023 | 0.022 | 0.021 | 0.020 | | | 45 | - | - | - | - | - | - | - | - | - | 0.022 | 0.021 | 0.020 | 0.019 | | | 50 | - | - | - | - | - | - | - | - | - | - | 0.020 | 0.019 | 0.018 | | | 55 | - | - | - | - | - | - | - | - | - | - | - | 0.018 | 0.017 | | | 60 | - | - | - | - | - | - | - | - | - | - | - | - | 0.016 | |

Table A102.2.6(2)

Assembly U-factors for Roofs with Tapered Insulation Entirely Above Deck Sloped Triangle (Roof with Center Drain)e,f,g,h,i

(Uninterrupted by Framing)

| | | --- |

| | Rated R-value of Insulation at Maximum Condition (Rmaxc) | | | | | | | | | | | | | | | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | | 1 | 5 | 10 | 15 | 20 | 25 | 30 | 35 | 40 | 45 | 50 | 55 | 60 | | | | Rated R-value of insulation at a Minimum Condition (Rminb) | 1 | 0.526 | 0.242 | 0.146 | 0.106 | 0.083 | 0.068 | 0.058 | 0.051 | 0.045 | 0.040 | 0.036 | 0.033 | 0.031 | | 5 | - | 0.173 | 0.112 | 0.084 | 0.068 | 0.057 | 0.049 | 0.044 | 0.039 | 0.035 | 0.032 | 0.030 | 0.028 | | | 10 | - | - | 0.093 | 0.071 | 0.059 | 0.050 | 0.044 | 0.039 | 0.035 | 0.032 | 0.029 | 0.027 | 0.025 | | | 15 | - | - | - | 0.063 | 0.053 | 0.045 | 0.040 | 0.035 | 0.032 | 0.029 | 0.027 | 0.025 | 0.023 | | | 20 | - | - | - | - | 0.048 | 0.042 | 0.037 | 0.033 | 0.030 | 0.027 | 0.025 | 0.024 | 0.022 | | | 25 | - | - | - | - | - | 0.039 | 0.034 | 0.031 | 0.028 | 0.026 | 0.024 | 0.022 | 0.021 | | | 30 | - | - | - | - | - | - | 0.032 | 0.029 | 0.027 | 0.025 | 0.023 | 0.021 | 0.020 | | | 35 | - | - | - | - | - | - | - | 0.028 | 0.026 | 0.024 | 0.022 | 0.021 | 0.019 | | | 40 | - | - | - | - | - | - | - | - | 0.025 | 0.023 | 0.021 | 0.020 | 0.019 | | | 45 | - | - | - | - | - | - | - | - | - | 0.022 | 0.020 | 0.019 | 0.018 | | | 50 | - | - | - | - | - | - | - | - | - | - | 0.020 | 0.018 | 0.017 | | | 55 | - | - | - | - | - | - | - | - | - | - | - | 0.018 | 0.017 | | | 60 | - | - | - | - | - | - | - | - | - | - | - | - | 0.016 | |

Table A102.2.6(3)

Assembly U-factors for Roofs with Tapered Insulation Entirely Above Deck Sloped Triangle (Roof with Perimeter Drains)e,f,g,h,i

(Uninterrupted by Framing)

| | | --- |

| | Rated R-value of Insulation at Maximum Condition (Rmaxc) | | | | | | | | | | | | | | | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | | 1 | 5 | 10 | 15 | 20 | 25 | 30 | 35 | 40 | 45 | 50 | 55 | 60 | | | | Rated R-value of insulation at a Minimum Condition (Rminb) | 1 | 0.562 | 0.242 | 0.146 | 0.106 | 0.083 | 0.068 | 0.058 | 0.051 | 0.045 | 0.040 | 0.036 | 0.033 | 0.031 | | 5 | - | 0.173 | 0.122 | 0.084 | 0.068 | 0.057 | 0.049 | 0.044 | 0.039 | 0.035 | 0.032 | 0.030 | 0.028 | | | 10 | - | - | 0.093 | 0.071 | 0.059 | 0.050 | 0.044 | 0.039 | 0.035 | 0.032 | 0.029 | 0.027 | 0.025 | | | 15 | - | - | - | 0.063 | 0.053 | 0.045 | 0.040 | 0.035 | 0.032 | 0.029 | 0.027 | 0.025 | 0.024 | | | 20 | - | - | - | - | 0.048 | 0.042 | 0.037 | 0.033 | 0.030 | 0.027 | 0.025 | 0.024 | 0.022 | | | 25 | - | - | - | - | - | 0.039 | 0.034 | 0.031 | 0.028 | 0.026 | 0.024 | 0.022 | 0.021 | | | 30 | - | - | - | - | - | - | 0.032 | 0.029 | 0.027 | 0.025 | 0.023 | 0.021 | 0.020 | | | 35 | - | - | - | - | - | - | - | 0.028 | 0.026 | 0.024 | 0.022 | 0.021 | 0.019 | | | 40 | - | - | - | - | - | - | - | - | 0.025 | 0.023 | 0.021 | 0.020 | 0.019 | | | 45 | - | - | - | - | - | - | - | - | - | 0.022 | 0.020 | 0.019 | 0.018 | | | 50 | - | - | - | - | - | - | - | - | - | - | 0.020 | 0.018 | 0.017 | | | 55 | - | - | - | - | - | - | - | - | - | - | - | 0.018 | 0.017 | | | 60 | - | - | - | - | - | - | - | - | - | - | - | - | 0.016 | |

| Footnotes to Tables A102.2.6(1), A102.2.6(2), and A102.2.6(3): | | | --- | --- | | | a Rmax and Rmin are determined along the linearly tapered cross section for the 6. respective minimum and maximum thickness values for the roof section being analyzed. For triangular roof sections. | | | b Rmax refers to the insulation value along the long edge of the triangle and Rmin to the insulation at the point of the triangle which assumes that the insulation slopes to the center. | | | c Rmax refers to the insulation value at the point of the triangle and Rmin to the insulation along the long edge of the triangle which assumes that the insulation slopes to the perimeter. | | | d Effective U-factor for rectangular tapered insulation is calculated as follows: |

| Reff | = | Rmax – Rmin | | --- | --- | --- | | Ln[Rmax/Rmin] | | |

| | e Effective U-factor for triangular tapered insulation is calculated as follows: | | --- | --- | | | Reff = [2/(Rmax – Rmin) [1 + (Rmin/Rmax – Rmin)ln(Rmin/Rmax)]]-1 | | | f Assembly U-factors include an exterior air film (R=0.17) and an interior air film, horizontal with heat flow up (R=0.61). | | | g For effective U-factors of roof assemblies with different Rmax or Rmin values not listed in the tables interpolation is allowed. | | | h This table shall only be applied to tapered insulation that is tapered along only one axis. | | | i In areas of differing insulation slopes/configurations, individual U-values shall be calculated and an area weighted U-value calculation shall be used to determine the effective value of the roof. |

Reviser's note: The brackets and enclosed material in the text of the above section occurred in the copy filed by the agency.

Wash. Admin. Code § 51-11C-61030 Section A103—Above grade walls.

History

• Statutory Authority: RCW 19.27A.020, 19.27A.025 and chapters 19.27 and 34.05 RCW. WSR 13-04-056, § 51-11C-61030, filed 2/1/13, effective 7/1/13.

Wash. Admin. Code § 51-11C-61031 Section A103.1—General.

A103.1 General. The tables in this section list heat loss coefficients for the opaque portion of above-grade wood stud frame walls, metal stud frame walls and concrete masonry walls (Btu/h • ft2 • °F). They are derived from procedures listed in the ASHRAE Fundamentals Handbook. For intermediate floor slabs which penetrate the insulated wall, use the concrete wall U-factors in Table A103.3.7.1(1).

Insulation is assumed to uniformly fill the entire cavity and to be installed as per manufacturer's directions. All walls are assumed to be finished on the inside with 1/2 inch gypsum wallboard, and on the outside with either beveled wood siding over 1/2 inch plywood sheathing or with 5/8 inch T1-11 siding. Insulated sheathing (either interior or exterior) is assumed to cover the entire opaque wall surface, except where modified in accordance with footnote g to Table C402.1.3.

Metal building walls have a different construction and are addressed in Table A103.3.6.3.

History

• Statutory Authority: RCW 19.27A.025, 19.27A.160, and 19.27.074. WSR 16-03-072, § 51-11C-61031, filed 1/19/16, effective 7/1/16. Statutory Authority: RCW 19.27A.025, 19.27A.045, and 19.27.074. WSR 13-20-120, § 51-11C-61031, filed 10/1/13, effective 11/1/13. Statutory Authority: RCW 19.27A.020, 19.27A.025 and chapters 19.27 and 34.05 RCW. WSR 13-04-056, § 51-11C-61031, filed 2/1/13, effective 7/1/13.

Wash. Admin. Code § 51-11C-61032 Section A103.2—Framing description.

A103.2 Framing description. For wood stud frame walls, three framing types are considered and defined as follows:

A103.2.1 Standard. Studs framed on 16 inch centers with double top plate and single bottom plate. Corners use three studs and each opening is framed using two studs. Headers consist of double 2x or single 4x material with an air space left between the header and the exterior sheathing. Interior partition wall/exterior wall intersections use two studs in the exterior wall.

Standard framing weighting factors:

| Studs and plates | 0.19 | | --- | --- | | Insulated cavity | 0.77 | | Headers | 0.04 |

A103.2.2 Intermediate. Studs framed on 16 inch centers with double top plate and single bottom plate. Corners use two studs or other means of fully insulating corners, and each opening is framed by two studs. Headers consist of double 2x material with R-10 insulation. Interior partition wall/exterior wall intersections are fully insulated in the exterior wall.

Intermediate framing weighting factors:

| Studs and plates | 0.18 | | --- | --- | | Insulated cavity | 0.78 | | Headers | 0.04 |

A103.2.3 Advanced. Studs framed on 24 inch centers with double top plate and single bottom plate. Corners use two studs or other means of fully insulating corners, and one stud is used to support each header. Headers consist of double 2x material with R-10 insulation. Interior partition wall/exterior wall intersections are fully insulated in the exterior wall.

Advanced framing weighting factors:

| Studs and plates | 0.13 | | --- | --- | | Insulated cavity | 0.83 | | Headers | 0.04 |

History

• Statutory Authority: RCW 19.27A.020, 19.27A.025 and chapters 19.27 and 34.05 RCW. WSR 13-04-056, § 51-11C-61032, filed 2/1/13, effective 7/1/13.

Wash. Admin. Code § 51-11C-61033 Section A103.3—Component description.

A103.3 Component description. Default coefficients for the following types of walls are listed: Single-stud walls, strap walls, double-stud walls, log walls, stress-skin panels, metal stud walls, and metal building walls.

History

• Statutory Authority: RCW 19.27A.020, 19.27A.025 and chapters 19.27 and 34.05 RCW. WSR 13-04-056, § 51-11C-61033, filed 2/1/13, effective 7/1/13.

Wash. Admin. Code § 51-11C-610331 Section A103.3.1—Single stud wall.

A103.3.1 Single-stud wall. Tables A103.3.1(1) through A103.3.1(8): Assumes either 2 x 4 or 2 x 6 studs framed on 16 or 24 inch centers. Headers are solid for 2 x 4 walls and double 2x for 2 x 6 walls, with either dead-air or rigid-board insulation in the remaining space.

| TABLE A103.3.1(1) | | | | | | | | --- | --- | --- | --- | --- | --- | --- | | 2 x 4 Single Wood Stud: R-11 Batt | | | | | | | | | Siding Material/Framing Type | | | | | | | | | Lapped Wood | T1-11 | | | | | | R-value of FoamBoard | STD | ADV | STD | ADV | | | NOTE: Nominal Batt R-value: R-11 at 3.5 inch thickness Installed Batt R-value: R-11 in 3.5 inch cavity | 0 | 0.088 | 0.084 | 0.094 | 0.090 | | | 1 | 0.080 | 0.077 | 0.085 | 0.082 | | | | 2 | 0.074 | 0.071 | 0.078 | 0.075 | | | | 3 | 0.069 | 0.066 | 0.072 | 0.070 | | | | 4 | 0.064 | 0.062 | 0.067 | 0.065 | | | | 5 | 0.060 | 0.058 | 0.063 | 0.061 | | | | 6 | 0.056 | 0.055 | 0.059 | 0.057 | | | | 7 | 0.053 | 0.052 | 0.055 | 0.054 | | | | 8 | 0.051 | 0.049 | 0.052 | 0.051 | | | | 9 | 0.048 | 0.047 | 0.050 | 0.049 | | | | 10 | 0.046 | 0.045 | 0.047 | 0.046 | | | | 11 | 0.044 | 0.043 | 0.045 | 0.044 | | | | 12 | 0.042 | 0.041 | 0.043 | 0.042 | | | | | | | | | | |

| TABLE A103.3.1(2) | | | | | | | | --- | --- | --- | --- | --- | --- | --- | | 2 x 4 Single Wood Stud: R-13 Batt | | | | | | | | | Siding Material/Framing Type | | | | | | | | | Lapped Wood | T1-11 | | | | | | R-value of FoamBoard | STD | ADV | STD | ADV | | | NOTE: Nominal Batt R-value: R-13 at 3.63 inch thickness Installed Batt R-value: R-12.7 in 3.5 inch cavity | 0 | 0.082 | 0.078 | 0.088 | 0.083 | | | 1 | 0.075 | 0.072 | 0.080 | 0.076 | | | | 2 | 0.069 | 0.066 | 0.073 | 0.070 | | | | 3 | 0.065 | 0.062 | 0.068 | 0.065 | | | | 4 | 0.060 | 0.058 | 0.063 | 0.061 | | | | 5 | 0.057 | 0.055 | 0.059 | 0.057 | | | | 6 | 0.053 | 0.052 | 0.056 | 0.054 | | | | 7 | 0.051 | 0.049 | 0.052 | 0.051 | | | | 8 | 0.048 | 0.047 | 0.050 | 0.048 | | | | 9 | 0.046 | 0.045 | 0.047 | 0.046 | | | | 10 | 0.044 | 0.043 | 0.045 | 0.044 | | | | 11 | 0.042 | 0.041 | 0.043 | 0.042 | | | | 12 | 0.040 | 0.039 | 0.041 | 0.040 | | | | | | | | | | |

| TABLE A103.3.1(3) | | | | | | | | --- | --- | --- | --- | --- | --- | --- | | 2 x 4 Single Wood Stud: R-15 Batt | | | | | | | | | Siding Material/Framing Type | | | | | | | | | Lapped Wood | T1-11 | | | | | | R-value of FoamBoard | STD | ADV | STD | ADV | | | NOTE: Nominal Batt R-value: R-15 at 3.5 inch thickness Installed Batt R-value: R-15 in 3.5 inch cavity | 0 | 0.076 | 0.071 | 0.081 | 0.075 | | | 1 | 0.069 | 0.065 | 0.073 | 0.069 | | | | 2 | 0.064 | 0.061 | 0.068 | 0.069 | | | | 3 | 0.060 | 0.057 | 0.063 | 0.059 | | | | 4 | 0.056 | 0.053 | 0.059 | 0.056 | | | | 5 | 0.053 | 0.051 | 0.055 | 0.052 | | | | 6 | 0.050 | 0.048 | 0.052 | 0.050 | | | | 7 | 0.047 | 0.046 | 0.049 | 0.047 | | | | 8 | 0.045 | 0.044 | 0.047 | 0.045 | | | | 9 | 0.043 | 0.042 | 0.044 | 0.043 | | | | 10 | 0.041 | 0.040 | 0.042 | 0.041 | | | | 11 | 0.039 | 0.038 | 0.041 | 0.039 | | | | 12 | 0.038 | 0.037 | 0.039 | 0.038 | | | | | | | | | | |

| TABLE A103.3.1(4) | | | | | | | | | | --- | --- | --- | --- | --- | --- | --- | --- | --- | | 2 x 6 Single Wood Stud: R-19 Batt | | | | | | | | | | | Siding Material/Framing Type | | | | | | | | | | | Lapped Wood | T1-11 | | | | | | | | R-value of FoamBoard | STD | INT | ADV | STD | INT | ADV | | | NOTE: Nominal Batt R-value: R-19 at 6 inch thickness Installed Batt R-value: R-18 in 5.5 inch cavity | 0 | 0.062 | 0.058 | 0.055 | 0.065 | 0.061 | 0.058 | | | 1 | 0.058 | 0.055 | 0.052 | 0.060 | 0.057 | 0.055 | | | | 2 | 0.054 | 0.052 | 0.050 | 0.056 | 0.054 | 0.051 | | | | 3 | 0.051 | 0.049 | 0.047 | 0.053 | 0.051 | 0.049 | | | | 4 | 0.048 | 0.046 | 0.045 | 0.050 | 0.048 | 0.046 | | | | 5 | 0.046 | 0.044 | 0.043 | 0.048 | 0.046 | 0.044 | | | | 6 | 0.044 | 0.042 | 0.041 | 0.045 | 0.044 | 0.042 | | | | 7 | 0.042 | 0.040 | 0.039 | 0.043 | 0.042 | 0.040 | | | | 8 | 0.040 | 0.039 | 0.038 | 0.041 | 0.040 | 0.039 | | | | 9 | 0.038 | 0.037 | 0.035 | 0.039 | 0.038 | 0.037 | | | | 10 | 0.037 | 0.036 | 0.035 | 0.038 | 0.037 | 0.036 | | | | 11 | 0.036 | 0.035 | 0.034 | 0.036 | 0.035 | 0.035 | | | | 12 | 0.034 | 0.033 | 0.033 | 0.035 | 0.034 | 0.033 | | | | | | | | | | | | |

| TABLE A103.3.1(5) | | | | | | | | | | --- | --- | --- | --- | --- | --- | --- | --- | --- | | 2 x 6 Single Wood Stud: R-21 Batt | | | | | | | | | | | Siding Material/Framing Type | | | | | | | | | | | Lapped Wood | T1-11 | | | | | | | | R-value of FoamBoard | STD | INT | ADV | STD | INT | ADV | | | NOTE: Nominal Batt R-value: R-21 at 5.5 inch thickness Installed Batt R-value: R-21 in 5.5 inch cavity | 0 | 0.057 | 0.054 | 0.051 | 0.060 | 0.056 | 0.053 | | | 1 | 0.054 | 0.051 | 0.048 | 0.056 | 0.053 | 0.050 | | | | 2 | 0.050 | 0.048 | 0.045 | 0.052 | 0.050 | 0.047 | | | | 3 | 0.048 | 0.045 | 0.043 | 0.049 | 0.047 | 0.045 | | | | 4 | 0.045 | 0.043 | 0.041 | 0.047 | 0.045 | 0.043 | | | | | 5 | 0.043 | 0.041 | 0.040 | 0.044 | 0.042 | 0.041 | | | | 6 | 0.041 | 0.039 | 0.038 | 0.042 | 0.041 | 0.039 | | | | 7 | 0.039 | 0.038 | 0.036 | 0.040 | 0.039 | 0.037 | | | | 8 | 0.038 | 0.036 | 0.035 | 0.039 | 0.037 | 0.036 | | | | 9 | 0.036 | 0.035 | 0.034 | 0.037 | 0.036 | 0.035 | | | | 10 | 0.035 | 0.034 | 0.033 | 0.036 | 0.035 | 0.033 | | | | 11 | 0.033 | 0.033 | 0.032 | 0.034 | 0.033 | 0.032 | | | | 12 | 0.032 | 0.031 | 0.031 | 0.033 | 0.032 | 0.031 | | | | | | | | | | | |

| TABLE A103.3.1(6) | | | | | | | | | | --- | --- | --- | --- | --- | --- | --- | --- | --- | | 2 x 6 Single Wood Stud: R-22 Batt | | | | | | | | | | | Siding Material/Framing Type | | | | | | | | | | | Lapped Wood | T1-11 | | | | | | | | R-value of FoamBoard | STD | INT | ADV | STD | INT | ADV | | | NOTE: Nominal Batt R-value: R-22 at 6.75 inch thickness Installed Batt R-value: R-20 in 5.5 inch cavity | 0 | 0.059 | 0.055 | 0.052 | 0.062 | 0.058 | 0.054 | | | 1 | 0.055 | 0.052 | 0.049 | 0.057 | 0.054 | 0.051 | | | | 2 | 0.052 | 0.049 | 0.047 | 0.054 | 0.051 | 0.048 | | | | 3 | 0.049 | 0.046 | 0.044 | 0.050 | 0.048 | 0.046 | | | | 4 | 0.046 | 0.044 | 0.042 | 0.048 | 0.046 | 0.044 | | | | 5 | 0.044 | 0.042 | 0.041 | 0.045 | 0.043 | 0.042 | | | | 6 | 0.042 | 0.040 | 0.039 | 0.043 | 0.042 | 0.040 | | | | | 7 | 0.040 | 0.039 | 0.037 | 0.041 | 0.040 | 0.038 | | | | 8 | 0.038 | 0.037 | 0.036 | 0.039 | 0.038 | 0.037 | | | | 9 | 0.037 | 0.036 | 0.035 | 0.038 | 0.037 | 0.035 | | | | 10 | 0.035 | 0.034 | 0.033 | 0.036 | 0.035 | 0.034 | | | | 11 | 0.034 | 0.033 | 0.032 | 0.035 | 0.034 | 0.033 | | | | 12 | 0.033 | 0.032 | 0.031 | 0.034 | 0.033 | 0.032 | | | | | | | | | | | |

| TABLE A103.3.1(7) | | | | | | | | | | --- | --- | --- | --- | --- | --- | --- | --- | --- | | 2 x 6 Single Wood Stud: Two R-11 Batts | | | | | | | | | | | Siding Material/Framing Type | | | | | | | | | | | Lapped Wood | T1-11 | | | | | | | | R-value of FoamBoard | STD | INT | ADV | STD | INT | ADV | | | NOTE: Nominal Batt R-value: R-22 at 7 inch thickness Installed Batt R-value: R-18.9 in 5.5 inch cavity | 0 | 0.060 | 0.057 | 0.054 | 0.063 | 0.059 | 0.056 | | | 1 | 0.056 | 0.053 | 0.051 | 0.059 | 0.056 | 0.053 | | | | 2 | 0.053 | 0.050 | 0.048 | 0.055 | 0.052 | 0.050 | | | | 3 | 0.050 | 0.048 | 0.046 | 0.052 | 0.049 | 0.047 | | | | 4 | 0.047 | 0.045 | 0.044 | 0.049 | 0.047 | 0.045 | | | | | 5 | 0.045 | 0.043 | 0.042 | 0.046 | 0.045 | 0.043 | | | | 6 | 0.043 | 0.041 | 0.040 | 0.044 | 0.043 | 0.041 | | | | 7 | 0.041 | 0.040 | 0.038 | 0.042 | 0.041 | 0.039 | | | | 8 | 0.039 | 0.038 | 0.037 | 0.040 | 0.039 | 0.038 | | | | 9 | 0.038 | 0.037 | 0.036 | 0.039 | 0.038 | 0.036 | | | | 10 | 0.036 | 0.035 | 0.034 | 0.037 | 0.036 | 0.035 | | | | 11 | 0.035 | 0.034 | 0.033 | 0.036 | 0.035 | 0.034 | | | | 12 | 0.034 | 0.033 | 0.032 | 0.034 | 0.034 | 0.033 | | | | | | | | | | | |

| TABLE A103.3.1(8) | | | | | | | | | | --- | --- | --- | --- | --- | --- | --- | --- | --- | | 2 x 8 Single Stud: R-25 Batt | | | | | | | | | | | Siding Material/Framing Type | | | | | | | | | | | Lapped Wood | T1-11 | | | | | | | | R-value of FoamBoard | STD | INT | ADV | STD | INT | ADV | | | NOTE: Nominal Batt R-value: R-25 at 8 inch thickness Installed Batt R-value: R-23.6 in 7.25 inch cavity | 0 | 0.051 | 0.047 | 0.045 | 0.053 | 0.049 | 0.046 | | | 1 | 0.048 | 0.045 | 0.043 | 0.049 | 0.046 | 0.044 | | | | 2 | 0.045 | 0.043 | 0.041 | 0.047 | 0.044 | 0.042 | | | | 3 | 0.043 | 0.041 | 0.039 | 0.044 | 0.042 | 0.040 | | | | 4 | 0.041 | 0.039 | 0.037 | 0.042 | 0.040 | 0.038 | | | | | 5 | 0.039 | 0.037 | 0.036 | 0.040 | 0.038 | 0.037 | | | | 6 | 0.037 | 0.036 | 0.035 | 0.038 | 0.037 | 0.036 | | | | 7 | 0.036 | 0.035 | 0.033 | 0.037 | 0.035 | 0.034 | | | | 8 | 0.035 | 0.033 | 0.032 | 0.035 | 0.034 | 0.033 | | | | 9 | 0.033 | 0.032 | 0.031 | 0.034 | 0.033 | 0.032 | | | | 10 | 0.032 | 0.031 | 0.030 | 0.033 | 0.032 | 0.031 | | | | 11 | 0.031 | 0.030 | 0.029 | 0.032 | 0.031 | 0.030 | | | | 12 | 0.030 | 0.029 | 0.028 | 0.031 | 0.030 | 0.029 | | | | | | | | | | | |

[Statutory Authority: RCW 19.27A.020, 19.27A.025 and chapters 19.27 and 34.05 RCW. WSR 13-04-056, § 51-11C-610331, filed 2/1/13, effective 7/1/13.]

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Wash. Admin. Code § 51-11C-610332 Section A103.3.2—Strap wall.

A103.3.2 Strap wall. Table A103.3.2: Assumes 2 x 6 studs framed on 16 or 24 inch centers. 2 x 3 or 2 x 4 strapping is run horizontally along the interior surface of the wall to provide additional space for insulation.

Table A103.3.2

2 x 6: Strap Wall

| | Siding Material/Frame Type | | | | | --- | --- | --- | --- | --- | | | Lapped Wood | T1-11 | | | | | STD | ADV | STD | ADV | | R-19 + R-11 Batts | 0.036 | 0.035 | 0.038 | 0.036 | | R-19 + R-8 Batts | 0.041 | 0.039 | 0.042 | 0.040 |

History

• Statutory Authority: RCW 19.27A.020, 19.27A.025 and chapters 19.27 and 34.05 RCW. WSR 13-04-056, § 51-11C-610332, filed 2/1/13, effective 7/1/13.

Wash. Admin. Code § 51-11C-610333 Section A103.3.3—Double stud wall.

A103.3.3 Double stud wall. Tables A103.3.3(1) and A103.3.3(2): Assumes an exterior structural wall and a separate interior, nonstructural wall. Insulation is placed in both wall cavities and in the space between the two walls. Stud spacing is assumed to be on 24 inch centers for both walls.

Table A103.3.3(1)

2 x 6 + 2 x 4: Double Wood Stud

| | Siding Material/Frame Type | | | | | | | --- | --- | --- | --- | --- | --- | --- | | Batt Configuration | Lapped Wood | T1-11 | | | | | | Exterior | Middle | Interior | STD | ADV | STD | ADV | | R-19 | ——— | R-11 | 0.040 | 0.037 | 0.041 | 0.038 | | R-19 | ——— | R-19 | 0.034 | 0.031 | 0.035 | 0.032 | | R-19 | R-8 | R-11 | 0.029 | 0.028 | 0.031 | 0.029 | | R-19 | R-11 | R-11 | 0.027 | 0.026 | 0.028 | 0.027 | | R-19 | R-11 | R-19 | 0.024 | 0.023 | 0.025 | 0.023 | | R-19 | R-19 | R-19 | 0.021 | 0.020 | 0.021 | 0.020 |

Table A103.3.3(2)

2 x 4 + 2 x 4: Double Wood Stud

| | Siding Material/Frame Type | | | | | | | --- | --- | --- | --- | --- | --- | --- | | Batt Configuration | Lapped Wood | T1-11 | | | | | | Exterior | Middle | Interior | STD | ADV | STD | ADV | | R-11 | ———— | R-11 | 0.050 | 0.046 | 0.052 | 0.048 | | R-19 | ———— | R-11 | 0.039 | 0.037 | 0.043 | 0.039 | | R-11 | R-8 | R-11 | 0.037 | 0.035 | 0.036 | 0.036 | | R-11 | R-11 | R-11 | 0.032 | 0.031 | 0.033 | 0.032 | | R-13 | R-13 | R-13 | 0.029 | 0.028 | 0.029 | 0.028 | | R-11 | R-19 | R-11 | 0.026 | 0.026 | 0.027 | 0.026 |

History

• Statutory Authority: RCW 19.27A.020, 19.27A.025 and chapters 19.27 and 34.05 RCW. WSR 13-04-056, § 51-11C-610333, filed 2/1/13, effective 7/1/13.

Wash. Admin. Code § 51-11C-610334 Section A103.3.4—Log wall.

A103.3.4 Log wall. U-factors for log walls shall be determined using ICC 400 Table 305.3.1.1, U-Factor of log wall (UW) by log thickness (WL) and specific gravity.

History

• Statutory Authority: RCW 19.27A.020, 19.27A.045, 19.27A.160 and chapter 19.27 RCW. WSR 20-01-047, § 51-11C-610334, filed 12/9/19, effective 7/1/20. Statutory Authority: RCW 19.27A.020, 19.27A.025 and chapters 19.27 and 34.05 RCW. WSR 13-04-056, § 51-11C-610334, filed 2/1/13, effective 7/1/13.

Wash. Admin. Code § 51-11C-610335 Section A103.3.5—Stress skin panel.

A103.3.5 Stress-skin panel. See Table A103.3.5.

Table A103.3.5

Stress Skin Panel

| | Panel Thickness, Inches | U-factor | | | --- | --- | --- | --- | | NOTE: R-value of expanded polystyrene: R-3.85 per inch Framing: 6% Spline: 8% | 3 1/2 | 0.071 | | | 5 1/2 | 0.048 | | | | 7 1/4 | 0.037 | | | | 9 1/4 | 0.030 | | | | 11 1/4 | 0.025 | | | | No thermal bridging between interior and exterior splines | | | |

History

• Statutory Authority: RCW 19.27A.020, 19.27A.025 and chapters 19.27 and 34.05 RCW. WSR 13-04-056, § 51-11C-610335, filed 2/1/13, effective 7/1/13.

Wash. Admin. Code § 51-11C-610336 Section A103.3.6—Metal stud walls.

A103.3.6 Metal stud walls. The nominal R-values in Tables A103.3.6.1 through A103.3.6.3 may be used for purposes of calculating metal stud wall section U-factors in lieu of the ASHRAE zone calculation method as provided in Chapter 27 of the ASHRAE Fundamentals Handbook.

A103.3.6.1 Metal stud wall, overall assembly U-factors. Tables A103.3.6.1(1) and A103.6.1(2): Assumes metal studs spaced on 16 or 24 inch centers with insulation installed to fill wall cavities. Continuous rigid board insulation is applied without creating uninsulated voids in the wall assembly.

Table A103.3.6.1(1)

Overall Assembly U-factors for Metal Stud Walls with Continuous Insulation

| | | Cavity Insulation | | | | | | | --- | --- | --- | --- | --- | --- | --- | --- | | Metal Framing | R-Value of Continuous Foam Board Insulation | R-0 | R-11 | R-13 | R-15 | R-19 | R-21 | | 16" o.c. | R-0 (none) | 0.352 | 0.132 | 0.124 | 0.118 | 0.109 | 0.106 | | | R-1 | 0.260 | 0.117 | 0.111 | 0.106 | 0.099 | 0.096 | | R-2 | 0.207 | 0.105 | 0.100 | 0.096 | 0.090 | 0.087 | | | R-3 | 0.171 | 0.095 | 0.091 | 0.087 | 0.082 | 0.080 | | | R-4 | 0.146 | 0.087 | 0.083 | 0.080 | 0.076 | 0.074 | | | R-5 | 0.128 | 0.080 | 0.077 | 0.074 | 0.071 | 0.069 | | | R-6 | 0.113 | 0.074 | 0.071 | 0.069 | 0.066 | 0.065 | | | R-7 | 0.102 | 0.069 | 0.066 | 0.065 | 0.062 | 0.061 | | | R-8 | 0.092 | 0.064 | 0.062 | 0.061 | 0.058 | 0.057 | | | | R-9 | 0.084 | 0.060 | 0.059 | 0.057 | 0.055 | 0.054 | | | R-10 | 0.078 | 0.057 | 0.055 | 0.054 | 0.052 | 0.051 | | | R-11 | 0.072 | 0.054 | 0.052 | 0.051 | 0.050 | 0.049 | | | R-12 | 0.067 | 0.051 | 0.050 | 0.049 | 0.047 | 0.047 | | | R-13 | 0.063 | 0.049 | 0.048 | 0.047 | 0.045 | 0.045 | | | R-14 | 0.059 | 0.046 | 0.045 | 0.045 | 0.043 | 0.043 | | | R-15 | 0.056 | 0.044 | 0.043 | 0.043 | 0.041 | 0.041 | | | R-20 | 0.044 | 0.036 | 0.036 | 0.035 | 0.034 | 0.034 | | 24" o.c. | R-0 (none) | 0.338 | 0.116 | 0.108 | 0.102 | 0.094 | 0.090 | | | R-1 | 0.253 | 0.104 | 0.098 | 0.092 | 0.086 | 0.083 | | | R-2 | 0.202 | 0.094 | 0.089 | 0.084 | 0.079 | 0.077 | | | R-3 | 0.168 | 0.086 | 0.082 | 0.078 | 0.073 | 0.071 | | | R-4 | 0.144 | 0.079 | 0.075 | 0.072 | 0.068 | 0.066 | | | R-5 | 0.126 | 0.073 | 0.070 | 0.067 | 0.064 | 0.062 | | | R-6 | 0.112 | 0.068 | 0.066 | 0.063 | 0.060 | 0.059 | | | R-7 | 0.100 | 0.064 | 0.062 | 0.059 | 0.057 | 0.055 | | | R-8 | 0.091 | 0.060 | 0.058 | 0.056 | 0.054 | 0.052 | | | R-9 | 0.084 | 0.057 | 0.055 | 0.053 | 0.051 | 0.050 | | | R-10 | 0.077 | 0.054 | 0.052 | 0.050 | 0.048 | 0.048 | | | R-11 | 0.072 | 0.051 | 0.049 | 0.048 | 0.046 | 0.045 | | | R-12 | 0.067 | 0.048 | 0.047 | 0.046 | 0.044 | 0.043 | | | R-13 | 0.063 | 0.046 | 0.045 | 0.044 | 0.042 | 0.042 | | | R-14 | 0.059 | 0.044 | 0.043 | 0.042 | 0.041 | 0.040 | | | R-15 | 0.056 | 0.042 | 0.041 | 0.040 | 0.039 | 0.038 | | | R-20 | 0.044 | 0.035 | 0.034 | 0.034 | 0.033 | 0.032 |

Continuous foam board insulation: Continuous insulation assumes no thermal bridging of insulation by framing or z-furring through applied foam board. Zone calculation method as provided in the ASHRAE Fundamentals Handbook must be used for thermally bridged foam board insulation. Values for attachment of insulation with z-furring are given in Table A103.3.6.1(2).

Table A103.3.6.1(2)

Overall Assembly U-factors for Metal Stud Walls with Insulation Supported by Z-furring

| | | | Cavity Insulation | | | | | | | --- | --- | --- | --- | --- | --- | --- | --- | --- | | Metal Framing | R-Value of Foam Board Insulation | Z-furring Attachment | R-0 | R-11 | R-13 | R-15 | R-19 | R-21 | | 16" o.c. | R-0 (none) | Horizontal | 0.352 | 0.132 | 0.124 | 0.118 | 0.109 | 0.106 | | | R-5 | Horizontal | 0.155 | 0.089 | 0.086 | 0.083 | 0.078 | 0.077 | | | R-7.5 | Horizontal | 0.128 | 0.080 | 0.077 | 0.074 | 0.071 | 0.069 | | | R-10 | Horizontal | 0.110 | 0.072 | 0.070 | 0.068 | 0.065 | 0.064 | | | R-12.5 | Horizontal | 0.099 | 0.068 | 0.065 | 0.064 | 0.061 | 0.060 | | | R-15 | Horizontal | 0.091 | 0.064 | 0.062 | 0.060 | 0.058 | 0.057 | | | R-17.5 | Horizontal | 0.084 | 0.060 | 0.058 | 0.057 | 0.055 | 0.054 | | | R-20 | Horizontal | 0.078 | 0.057 | 0.056 | 0.054 | 0.052 | 0.052 | | | R-22.5 | Horizontal | 0.074 | 0.055 | 0.054 | 0.052 | 0.051 | 0.050 | | | R-25 | Horizontal | 0.071 | 0.053 | 0.052 | 0.051 | 0.049 | 0.048 | | | R-0 (none) | Vertical | 0.352 | 0.132 | 0.124 | 0.118 | 0.109 | 0.106 | | | R-5 | Vertical | 0.165 | 0.093 | 0.089 | 0.086 | 0.081 | 0.079 | | | R-7.5 | Vertical | 0.142 | 0.085 | 0.081 | 0.079 | 0.075 | 0.073 | | | R-10 | Vertical | 0.126 | 0.079 | 0.076 | 0.074 | 0.070 | 0.069 | | | R-12.5 | Vertical | 0.115 | 0.074 | 0.072 | 0.070 | 0.066 | 0.065 | | | R-15 | Vertical | 0.107 | 0.071 | 0.069 | 0.067 | 0.064 | 0.063 | | | R-17.5 | Vertical | 0.100 | 0.068 | 0.065 | 0.064 | 0.061 | 0.060 | | | R-20 | Vertical | 0.094 | 0.065 | 0.063 | 0.061 | 0.059 | 0.058 | | | R-22.5 | Vertical | 0.090 | 0.063 | 0.061 | 0.060 | 0.057 | 0.056 | | | R-25 | Vertical | 0.086 | 0.061 | 0.059 | 0.058 | 0.056 | 0.055 | | 24" o.c. | R-0 (none) | Horizontal | 0.338 | 0.116 | 0.108 | 0.102 | 0.094 | 0.090 | | | R-5 | Horizontal | 0.152 | 0.082 | 0.078 | 0.074 | 0.070 | 0.068 | | | R-7.5 | Horizontal | 0.126 | 0.074 | 0.070 | 0.068 | 0.064 | 0.062 | | | R-10 | Horizontal | 0.109 | 0.067 | 0.065 | 0.062 | 0.059 | 0.058 | | | R-12.5 | Horizontal | 0.098 | 0.063 | 0.061 | 0.059 | 0.056 | 0.055 | | | R-15 | Horizontal | 0.090 | 0.060 | 0.058 | 0.056 | 0.053 | 0.052 | | | R-17.5 | Horizontal | 0.083 | 0.057 | 0.055 | 0.053 | 0.051 | 0.050 | | | R-20 | Horizontal | 0.078 | 0.054 | 0.052 | 0.051 | 0.049 | 0.048 | | | R-22.5 | Horizontal | 0.074 | 0.052 | 0.050 | 0.049 | 0.047 | 0.046 | | | R-25 | Horizontal | 0.070 | 0.050 | 0.049 | 0.047 | 0.046 | 0.045 | | | R-0 (none) | Vertical | 0.338 | 0.116 | 0.108 | 0.102 | 0.094 | 0.090 | | | R-5 | Vertical | 0.162 | 0.084 | 0.080 | 0.077 | 0.072 | 0.070 | | | R-7.5 | Vertical | 0.140 | 0.078 | 0.074 | 0.071 | 0.067 | 0.065 | | | R-10 | Vertical | 0.124 | 0.073 | 0.070 | 0.067 | 0.063 | 0.062 | | | R-12.5 | Vertical | 0.113 | 0.069 | 0.066 | 0.064 | 0.061 | 0.059 | | | R-15 | Vertical | 0.106 | 0.066 | 0.063 | 0.061 | 0.058 | 0.057 | | | R-17.5 | Vertical | 0.098 | 0.063 | 0.061 | 0.059 | 0.056 | 0.055 | | | R-20 | Vertical | 0.093 | 0.061 | 0.059 | 0.057 | 0.054 | 0.053 | | | R-22.5 | Vertical | 0.089 | 0.059 | 0.057 | 0.055 | 0.053 | 0.051 | | | R-25 | Vertical | 0.085 | 0.057 | 0.055 | 0.054 | 0.051 | 0.050 |

Values in Table A103.3.6.1(2) may not be interpolated between. The value of the foam board insulation must meet or exceed the value listed in the table in order to use the value shown.

A103.3.6.2 Metal stud wall, effective R-values for metal framing and cavity only. Table A103.3.6.2: These values may be used for the metal-framing/cavity layers in walls with metal studs spaced on 16- or 24-inch centers with insulation installed to fill wall cavities in lieu of using the zone method provided in Chapter 25 of the ASHRAE Fundamentals Handbook.

Table A103.3.6.2

Effective R-values for Metal Framing and Cavity Only

| | Cavity | Insulation | | | | | --- | --- | --- | --- | --- | --- | | | Nominal Depth, Inches | Actual Depth, Inches | Nominal R-Value | Effective R-Value | | | 16" O.C. | 24" O.C. | | | | | | Air Cavity | any | any | R-0.91 (air) | 0.79 | 0.91 | | | 4 | 3-1/2 | R-11 | 5.5 | 6.6 | | | 4 | 3-1/2 | R-13 | 6.0 | 7.2 | | Wall | 4 | 3-1/2 | R-15 | 6.4 | 7.8 | | | 6 | 5-1/2 | R-19 | 7.1 | 8.6 | | | 6 | 5-1/2 | R-21 | 7.4 | 9.0 | | | 8 | 7-1/4 | R-25 | 7.8 | 9.6 | | Roof | | Insulation is uncompressed | R-11 | 5.5 | 6.1 | | | | | R-19 | 7.0 | 9.1 | | | | | R-30 | 9.3 | 11.4 |

A103.3.6.3 Metal building wall. Table A103.3.6.3: A wall whose structure consists of metal spanning panels supported by steel structural members (does not include spandrel glass or metal panels in curtain wall systems). The first nominal R-value is for insulation compressed between metal wall panels and the steel structure. For double-layer installations, the second rated R-value of insulation is for insulation installed from the inside, covering the girts. For continuous insulation (e.g., insulation boards) it is assumed that the insulation boards are installed on the inside of the girts and uninterrupted by the framing members. Insulation exposed to the conditioned space or semi-heated space shall have a facing, and all insulation seams shall be continuously sealed to provide a continuous air barrier.

Table A103.3.6.3

Default Metal Building Wall U-factors

| | | | Overall U-Factor for Assembly of Base Wall Plus Continuous Insulation (Uninterrupted by Framing) | | | | | | | --- | --- | --- | --- | --- | --- | --- | --- | --- | | Insulation System | Rated R-Value of Insulation | Overall U-Factor for Entire Base Wall Assembly | R-6.5 | R-13 | R-19.5 | R-26 | R-32.5 | R-39 | | Single Layer of Mineral Fiber | | | | | | | | | | | None | 1.180 | 0.136 | 0.072 | 0.049 | 0.037 | 0.030 | 0.025 | | | R-10 | 0.186 | 0.084 | 0.054 | 0.040 | 0.032 | 0.026 | 0.023 | | | R-11 | 0.185 | 0.084 | 0.054 | 0.040 | 0.032 | 0.026 | 0.023 | | | R-13 | 0.162 | 0.079 | 0.052 | 0.039 | 0.031 | 0.026 | 0.022 | | | R-16 | 0.155 | 0.077 | 0.051 | 0.039 | 0.031 | 0.026 | 0.022 | | | R-19 | 0.147 | 0.075 | 0.050 | 0.038 | 0.030 | 0.025 | 0.022 |

History

• Statutory Authority: RCW 19.27A.020, 19.27A.025 and chapters 19.27 and 34.05 RCW. WSR 13-04-056, § 51-11C-610336, filed 2/1/13, effective 7/1/13.

Wash. Admin. Code § 51-11C-610337 Section A103.3.7—Concrete and masonry walls.

A103.3.7 Concrete and masonry walls.

A103.3.7.1 Concrete masonry walls. The nominal R-values in Table A103.3.7.1 may be used for purposes of calculating concrete masonry wall section U-factors in lieu of the ASHRAE isothermal planes calculation method as provided in Chapter 27 of the ASHRAE Fundamentals Handbook.

Table A103.3.7.1

Default U-factors for Concrete and Masonry Walls

8" Concrete masonry

| | CORE TREATMENT | | | | | --- | --- | --- | --- | --- | | | Partial Grout with Ungrouted Cores | | | | | | | Loose-fill insulated | | | | Wall Description | Empty | Perlite | Vermiculite | Solid Grout | | Exposed Block, Both Sides | 0.40 | 0.23 | 0.24 | 0.43 | | R-5 Interior Insulation, Wood Furring | 0.14 | 0.11 | 0.12 | 0.15 | | R-6 Interior Insulation, Wood Furring | 0.14 | 0.11 | 0.11 | 0.14 | | R-10.5 Interior Insulation, Wood Furring | 0.11 | 0.09 | 0.09 | 0.11 | | R-8 Interior Insulation, Metal Clips | 0.11 | 0.09 | 0.09 | 0.11 | | R-6 Exterior Insulation | 0.12 | 0.10 | 0.10 | 0.12 | | R-10 Exterior Insulation | 0.08 | 0.07 | 0.07 | 0.08 | | R-9.5 Rigid Polystyrene Integral Insulation, Two Webbed Block | 0.11 | 0.09 | 0.09 | 0.12 |

12" Concrete masonry

| | CORE TREATMENT | | | | | --- | --- | --- | --- | --- | | | Partial Grout with Ungrouted Cores | | | | | | | Loose-fill insulated | | | | Wall Description | Empty | Perlite | Vermiculite | Solid Grout | | Exposed Block, Both Sides | 0.35 | 0.17 | 0.18 | 0.33 | | R-5 Interior Insulation, Wood Furring | 0.14 | 0.10 | 0.10 | 0.13 | | R-6 Interior Insulation, Wood Furring | 0.13 | 0.09 | 0.10 | 0.13 | | R-10.5 Interior Insulation, Wood Furring | 0.11 | 0.08 | 0.08 | 0.10 | | R-8 Interior Insulation, Metal Clips | 0.10 | 0.08 | 0.08 | 0.09 | | R-6 Exterior Insulation | 0.11 | 0.09 | 0.09 | 0.11 | | R-10 Exterior Insulation | 0.08 | 0.06 | 0.06 | 0.08 | | R-9.5 Rigid Polystyrene Integral Insulation, Two Webbed Block | 0.11 | 0.08 | 0.09 | 0.12 |

8" Clay brick

| | CORE TREATMENT | | | | | --- | --- | --- | --- | --- | | | Partial Grout with Ungrouted Cores | | | | | | | Loose-fill insulated | | | | Wall Description | Empty | Perlite | Vermiculite | Solid Grout | | Exposed Block, Both Sides | 0.50 | 0.31 | 0.32 | 0.56 | | R-5 Interior Insulation, Wood Furring | 0.15 | 0.13 | 0.13 | 0.16 | | R-6 Interior Insulation, Wood Furring | 0.15 | 0.12 | 0.12 | 0.15 | | R-10.5 Interior Insulation, Wood Furring | 0.12 | 0.10 | 0.10 | 0.12 | | R-8 Interior Insulation, Metal Clips | 0.11 | 0.10 | 0.10 | 0.11 | | R-6 Exterior Insulation | 0.12 | 0.11 | 0.11 | 0.13 | | R-10 Exterior Insulation | 0.08 | 0.08 | 0.08 | 0.09 |

6-Inch Concrete Poured

or Precast

| | CORE TREATMENT | | | | | --- | --- | --- | --- | --- | | | Partial Grout with Ungrouted Cores | | | | | | | Loose-fill insulated | | | | Wall Description | Empty | Perlite | Vermiculite | Solid Grout | | Exposed Concrete, Both Sides | NA | NA | NA | 0.61 | | R-5 Interior Insulation, Wood Furring | NA | NA | NA | 0.16 | | R-6 Interior Insulation, Wood Furring | NA | NA | NA | 0.15 | | R-10.5 Interior Insulation, Wood Furring | NA | NA | NA | 0.12 | | R-8 Interior Insulation, Metal Clips | NA | NA | NA | 0.12 | | R-6 Exterior Insulation | NA | NA | NA | 0.13 | | R-10 Exterior Insulation | NA | NA | NA | 0.09 |

Notes:

1. Grouted cores at 40" x 48" on center vertically and horizontally in partial grouted walls.

2. Interior insulation values include 1/2" gypsum board on the inner surface.

3. Furring and stud spacing is 16" on center. Insulation is assumed to fill furring space and is not compressed.

4. Intermediate values may be interpolated using this table. Values not contained in this table may be computed using the procedures listed in the ASHRAE Fundamentals Handbook.

5. Concrete masonry unit (CMU) assembly U-values are based on local test data for Washington state CMU block material using the ASTM C-236-87 steady state thermal conductance test. Tests included an 8"x8"x16" CMU with all cells filled with vermiculite (1995) and 8"x8"x16" CMU with all cells filled with polymaster foam in place insulation (1996). Refer to ASHRAE Standard 90.1 for additional nationally recognized data on the thermal performance of CMU block walls.

Table A103.3.7.1(2)

Default U-Factors for Concrete and Masonry Wallsa, b, c, d

| Framing Type and Depth | Rated R-value of Insulation Alone | Assembly U-factors for Solid Concrete Walls | Assembly U-factors for Concrete Block Walls: Solid Grouted | Assembly U-factors for Concrete Block Walls: Partially Grouted (Cores Uninsulated Except Where Specified) | | --- | --- | --- | --- | --- | | Base Wall only | | | | | | No Framing | R-0 | U-0.740 | U-0.580 | U-0.480 | | | Ungrouted Cores Filled with Loose-Fill Insulation | N.A. | N.A. | U-0.350 | | Continuous Wood Framing | | | | | | 0.75 in. | R-3.0 | U-0.247 | U-0.226 | U-0.210 | | 1.5 in. | R-6.0 | U-0.160 | U-0.151 | U-0.143 | | 2.0 in. | R-10.0 | U-0.116 | U-0.111 | U-0.107 | | 3.5 in. | R-11.0 | U-0.094 | U-0.091 | U-0.088 | | 3.5 in. | R-13.0 | U-0.085 | U-0.083 | U-0.080 | | 3.5 in. | R-15.0 | U-0.079 | U-0.077 | U-0.075 | | 5.5 in. | R-19.0 | U-0.060 | U-0.059 | U-0.058 | | 5.5 in. | R-21.0 | U-0.057 | U-0.055 | U-0.054 | | Continuous Metal Framing at 24 in. on center horizontally | | | | | | 1.0 in. | R-0.0 | U-0.414 | U-0.359 | U-0.318 | | 1.0 in. | R-3.8 | U-0.325 | U-0.290 | U-0.263 | | 1.0 in. | R-5.0 | U-0.314 | U-0.281 | U-0.255 | | 1.0 in. | R-6.5 | U-0.305 | U-0.274 | U-0.249 | | 1.5 in. | R-11.0 | U-0.267 | U-0.243 | U-0.223 | | 2.0 in. | R-7.6 | U-0.230 | U-0.212 | U-0.197 | | 2.0 in. | R-10.0 | U-0.219 | U-0.202 | U-0.188 | | 2.0 in. | R-13.0 | U-0.210 | U-0.195 | U-0.182 | | 3.0 in. | R-11.4 | U-0.178 | U-0.167 | U-0.157 | | 3.0 in. | R-15.0 | U-0.168 | U-0.158 | U-0.149 | | 3.0 in. | R-19.0 | U-0.161 | U-0.152 | U-0.144 | | 3.5 in. | R-11.0 | U-0.168 | U-0.158 | U-0.149 | | 3.5 in. | R-13.0 | U-0.161 | U-0.152 | U-0.144 | | 3.5 in. | R-15.0 | U-0.155 | U-0.147 | U-0.140 | | 4.5 in. | R-17.1 | U-0.133 | U-0.126 | U-0.121 | | 4.5 in. | R-22.5 | U-0.124 | U-0.119 | U-0.114 | | 4.5 in. | R-25.2 | U-0.122 | U-0.116 | U-0.112 | | 5.0 in. | R-19.0 | U-0.122 | U-0.117 | U-0.112 | | 5.0 in. | R-25.0 | U-0.115 | U-0.110 | U-0.106 | | 5.0 in. | R-28.0 | U-0.112 | U-0.107 | U-0.103 | | 5.0 in. | R-32.0 | U-0.109 | U-0.105 | U-0.101 | | 5.5 in. | R-19.0 | U-0.118 | U-0.113 | U-0.109 | | 5.5 in. | R-20.9 | U-0.114 | U-0.109 | U-0.105 | | 5.5 in. | R-21.0 | U-0.113 | U-0.109 | U-0.105 | | 5.5 in. | R-27.5 | U-0.106 | U-0.102 | U-0.099 | | 5.5 in. | R-30.8 | U-0.104 | U-0.100 | U-0.096 | | 6.0 in. | R-22.8 | U-0.106 | U-0.102 | U-0.098 | | 6.0 in. | R-30.0 | U-0.099 | U-0.095 | U-0.092 | | 6.0 in. | R-33.6 | U-0.096 | U-0.093 | U-0.090 | | 6.5 in. | R-24.7 | U-0.099 | U-0.096 | U-0.092 | | 7.0 in. | R-26.6 | U-0.093 | U-0.090 | U-0.087 | | 7.5 in. | R-28.5 | U-0.088 | U-0.085 | U-0.083 | | 8.0 in. | R-30.4 | U-0.083 | U-0.081 | U-0.079 | | 1 in. Metal Clips at 24 in. on center horizontally and 16 in. vertically (also, where allowed by Section C402.1.3, for assemblies with a ratio of metal penetration area/mass wall area of < 0.0004 or < 0.04% of the mass wall area) See ASHRAE Fundamentals for determination of U-factors for assemblies that include metal other than screws and nails. | | | | | | 1.0 in. | R-3.8 | U-0.210 | U-0.195 | U-0.182 | | 1.0 in. | R-5.0 | U-0.184 | U-0.172 | U-0.162 | | 1.0 in. | R-5.6 | U-0.174 | U-0.163 | U-0.154 | | 1.5 in. | R-5.7 | U-0.160 | U-0.151 | U-0.143 | | 1.5 in. | R-7.5 | U-0.138 | U-0.131 | U-0.125 | | 1.5 in. | R-8.4 | U-0.129 | U-0.123 | U-0.118 | | 2.0 in. | R-7.6 | U-0.129 | U-0.123 | U-0.118 | | 2.0 in. | R-10.0 | U-0.110 | U-0.106 | U-0.102 | | 2.0 in. | R-11.2 | U-0.103 | U-0.099 | U-0.096 | | 2.5 in. | R-9.5 | U-0.109 | U-0.104 | U-0.101 | | 2.5 in. | R-12.5 | U-0.092 | U-0.089 | U-0.086 | | 2.5 in. | R-14.0 | U-0.086 | U-0.083 | U-0.080 | | 3.0 in. | R-11.4 | U-0.094 | U-0.090 | U-0.088 | | 3.0 in. | R-15.0 | U-0.078 | U-0.076 | U-0.074 | | 3.0 in. | R-16.8 | U-0.073 | U-0.071 | U-0.069 | | 3.5 in. | R-13.3 | U-0.082 | U-0.080 | U-0.077 | | 3.5 in. | R-17.5 | U-0.069 | U-0.067 | U-0.065 | | 3.5 in. | R-19.6 | U-0.064 | U-0.062 | U-0.061 | | 4.0 in. | R-15.2 | U-0.073 | U-0.071 | U-0.070 | | 4.0 in. | R-20.0 | U-0.061 | U-0.060 | U-0.058 | | 4.0 in. | R-22.4 | U-0.057 | U-0.056 | U-0.054 | | 5.0 in. | R-28.0 | U-0.046 | U-0.046 | U-0.045 | | 6.0 in. | R-33.6 | U-0.039 | U-0.039 | U-0.038 | | 7.0 in. | R-39.2 | U-0.034 | U-0.034 | U-0.033 | | 8.0 in. | R-44.8 | U-0.030 | U-0.030 | U-0.029 | | 9.0 in. | R-50.4 | U-0.027 | U-0.027 | U-0.026 | | 10 in. | R-56.0 | U-0.024 | U-0.024 | U-0.024 | | 11 in. | R-61.6 | U-0.022 | U-0.022 | U-0.022 | | Continuous Insulation Uninterrupted by Framing | | | | | | No Framing | R-1.0 | U-0.425 | U-0.367 | U-0.324 | | | R-2.0 | U-0.298 | U-0.269 | U-0.245 | | | R-3.0 | U-0.230 | U-0.212 | U-0.197 | | | R-4.0 | U-0.187 | U-0.175 | U-0.164 | | | R-5.0 | U-0.157 | U-0.149 | U-0.141 | | No Framing | R-6.0 | U-0.136 | U-0.129 | U-0.124 | | | R-7.0 | U-0.120 | U-0.115 | U-0.110 | | | R-8.0 | U-0.107 | U-0.103 | U-0.099 | | | R-9.0 | U-0.097 | U-0.093 | U-0.090 | | | R-10.0 | U-0.088 | U-0.085 | U-0.083 | | No Framing | R-11.0 | U-0.081 | U-0.079 | U-0.076 | | | R-12.0 | U-0.075 | U-0.073 | U-0.071 | | | R-13.0 | U-0.070 | U-0.068 | U-0.066 | | | R-14.0 | U-0.065 | U-0.064 | U-0.062 | | | R-15.0 | U-0.061 | U-0.060 | U-0.059 | | No Framing | R-16.0 | U-0.058 | U-0.056 | U-0.055 | | | R-17.0 | U-0.054 | U-0.053 | U-0.052 | | | R-18.0 | U-0.052 | U-0.051 | U-0.050 | | | R-19.0 | U-0.049 | U-0.048 | U-0.047 | | | R-20.0 | U-0.047 | U-0.046 | U-0.045 | | No Framing | R-21.0 | U-0.045 | U-0.044 | U-0.043 | | | R-22.0 | U-0.043 | U-0.042 | U-0.042 | | | R-23.0 | U-0.041 | U-0.040 | U-0.040 | | | R-24.0 | U-0.039 | U-0.039 | U-0.038 | | | R-25.0 | U-0.038 | U-0.037 | U-0.037 | | No Framing | R-30.0 | U-0.032 | U-0.032 | U-0.031 | | | R-35.0 | U-0.028 | U-0.027 | U-0.027 | | | R-40.0 | U-0.024 | U-0.024 | U-0.024 | | | R-45.0 | U-0.022 | U-0.021 | U-0.021 | | | R-50.0 | U-0.019 | U-0.019 | U-0.019 | | | R-55.0 | U-0.018 | U-0.018 | U-0.018 | | | R-60.0 | U-0.016 | U-0.016 | U-0.016 | | Brick cavity wall with continuous insulation | | | | | | No Framing | R-0.0 | U-0.337 | U-0.299 | U-0.270 | | No Framing | R-3.8 | U-0.148 | U-0.140 | U-0.133 | | No Framing | R-5.0 | U-0.125 | U-0.120 | U-0.115 | | No Framing | R-6.5 | U-0.106 | U-0.102 | U-0.098 | | No Framing | R-7.6 | U-0.095 | U-0.091 | U-0.088 | | No Framing | R-10.0 | U-0.077 | U-0.075 | U-0.073 | | No Framing | R-10.5 | U-0.079 | U-0.077 | U-0.075 | | No Framing | R-11.4 | U-0.070 | U-0.068 | U-0.066 | | No Framing | R-15.0 | U-0.056 | U-0.055 | U-0.053 | | No Framing | R-16.5 | U-0.054 | U-0.053 | U-0.052 | | No Framing | R-19.0 | U-0.046 | U-0.045 | U-0.044 | | No Framing | R-22.5 | U-0.041 | U-0.040 | U-0.039 | | No Framing | R-28.5 | U-0.033 | U-0.032 | U-0.032 | | Continuous Insulation Uninterrupted by Framing with Stucco and Continuous Metal Framing at 24 in. on center horizontally | | | | | | 1.0 in. | R-0.0 + R-19 c.i. | U-0.047 | U-0.046 | U-0.045 | | 1.0 in. | R-3.8 + R-19 c.i. | U-0.045 | U-0.044 | U-0.044 | | 1.0 in. | R-5.0 + R-19 c.i. | U-0.045 | U-0.044 | U-0.043 | | 1.0 in. | R-6.5 + R-19 c.i. | U-0.045 | U-0.044 | U-0.043 | | 1.5 in. | R-11.0 + R-19 c.i. | U-0.044 | U-0.043 | U-0.043 | | 2.0 in. | R-7.6 + R-19 c.i. | U-0.043 | U-0.042 | U-0.041 | | 2.0 in. | R-10.0 + R-19 c.i. | U-0.042 | U-0.041 | U-0.041 | | 2.0 in. | R-13.0 + R-19 c.i. | U-0.042 | U-0.041 | U-0.041 | | 3.0 in. | R-11.4 + R-19 c.i. | U-0.041 | U-0.040 | U-0.039 | | 3.0 in. | R-15.0 + R-19 c.i. | U-0.040 | U-0.039 | U-0.039 | | 3.0 in. | R-19.0 + R-19 c.i. | U-0.040 | U-0.039 | U-0.038 | | 3.5 in. | R-11.0 + R-19 c.i. | U-0.040 | U-0.039 | U-0.039 | | 3.5 in. | R-13.0 + R-19 c.i. | U-0.040 | U-0.039 | U-0.038 | | 5.0 in. | R-19.0 + R-19 c.i. | U-0.037 | U-0.036 | U-0.036 | | 5.0 in. | R-25.0 + R-19 c.i. | U-0.036 | U-0.035 | U-0.035 | | 5.0 in. | R-32.5 + R-19 c.i. | U-0.035 | U-0.035 | U-0.034 | | 5.5 in. | R-19.0 + R-19 c.i. | U-0.036 | U-0.036 | U-0.035 | | 5.5 in. | R-21.0 + R-19 c.i. | U-0.035 | U-0.035 | U-0.035 |

Note for Default Table A103.3.7.1(2):

| a. | It is acceptable to use the U-factors in Table A103.3.7.1(2) for all concrete and masonry walls, provided that the grouting is equal to or less than that specified. | | --- | --- | | | - For ungrouted walls, use the partially grouted column. | | | - For metal studs and z-furring, use the continuous-metal-framing category. | | | - For discontinuous metal clips 1 inch square or smaller, use the metal-clip category. | | | - For insulation that is attached without any framing members (e.g. glued), use the continuous-insulation uninterrupted-by-framing category. Continuous insulation may be installed on the interior or exterior of masonry walls, or between stand-alone walls in multilayer masonry walls, or on the interior or exterior of the concrete. | | b. | For Table A103.3.7.1(2), the U-factor includes R-0.17 for exterior air film and R-0.68 for interior air film-vertical surfaces. For insulated walls, the U-factor also includes R-0.45 for 0.5 in. gypsum board. U-factors are provided for the following configurations: | | | (1) Concrete wall: 8-in. normal weight concrete wall with a density of 145 lb/ft3. | | | (2) Solid grouted concrete block wall: 8-in. medium weight ASTM C90 concrete block with a density of 115 lb/ft3 and solid grouted cores. | | | (3) Partially grouted concrete block wall: 8-in. medium weight ASTM C90 concrete block with a density of 115 lb/ft3 having reinforcing steel every 32 in. vertically and every 48 in. horizontally, with cores grouted in those areas only. Other cores are filled with insulating material only if there is no other insulation. | | c. | For walls with insulation contained in a framing layer, the U-factors in Table A103.3.7.1(2) assume contact (and thermal bridging) between the mass wall and other framing. For wall assemblies with multiple layers where the wood or metal framing layer does not contact the concrete or masonry layer (i.e., walls with an airspace between the stud wall layer and the mass wall layer), it is acceptable to use the appropriate wood or metal frame wall default U-factors in Tables A103.3.1 or A103.3.6.1. Note: It is acceptable to use this approach where the insulation extends beyond the framing and is in contact with the mass wall layer (e.g. a nominal four-inch metal stud containing insulation that is nominally six inches thick and therefore extends two inches beyond the back of the metal stud). | | d. | Except for wall assemblies qualifying for note 3, if not taken from Table A103.3.7.1(2), mass wall U-factors shall be determined in accordance with ASHRAE 90.1, Appendix A, Section A3.1 and Tables A3.1A to A3.1D, or Section A9.4. |

A103.3.7.2 Peripheral edges of intermediate concrete floors. See Table A103.3.7.2.

Table A103.3.7.2

Default U-factors for Peripheral Edges of Intermediate Concrete Floorsa, b, c

| | Average Thickness of Wall above and below | | | | | --- | --- | --- | --- | --- | | Slab Edge Treatment | 6 inches | 8 inches | 10 inches | 12 inches | | Exposed Concrete | 0.816 | 0.741 | 0.678 | 0.625 | | R-5 Exterior Insulation | 0.161 | 0.157 | 0.154 | 0.152 | | R-6 Exterior Insulation | 0.138 | 0.136 | 0.134 | 0.132 | | R-7 Exterior Insulation | 0.122 | 0.120 | 0.118 | 0.116 | | R-8 Exterior Insulation | 0.108 | 0.107 | 0.106 | 0.104 | | R-9 Exterior Insulation | 0.098 | 0.097 | 0.095 | 0.094 | | R-10 Exterior Insulation | 0.089 | 0.088 | 0.087 | 0.086 | | R-11 Exterior Insulation | 0.082 | 0.081 | 0.080 | 0.079 | | R-12 Exterior Insulation | 0.076 | 0.075 | 0.074 | 0.074 | | R-13 Exterior Insulation | 0.070 | 0.070 | 0.069 | 0.068 | | R-14 Exterior Insulation | 0.066 | 0.065 | 0.065 | 0.064 | | R-15 Exterior Insulation | 0.062 | 0.061 | 0.061 | 0.060 |

Note for Table A103.3.7.2:

| a. | Exterior insulation values listed above are continuous R-values on the exterior side of the concrete floor. | | --- | --- | | b. | For conditions with an exterior wall above the peripheral edge of intermediate concrete floor but with no wall below the intermediate concrete floor this table may be used as long as the code minimum insulation is applied to the floor slab below the concrete floor. | | c. | Typical conditions where conditioned space building envelope wall thermal insulation values are broken concrete floors include, but are not limited to, the following examples: | | | 1. Elevator hoistway shafts that serve the conditioned building and pass through unconditioned floors such as parking garage levels; | | | 2. Stairwell enclosures that serve the conditioned building and pass through unconditioned floors such as parking garage levels; | | | 3. Walls between interior and exterior building envelope that separate the interior conditioned space from an exterior courtyard or roofdeck; | | | 4. Walls between interior and exterior building envelope that separate the interior conditioned space from an exterior unconditioned space on parking garage levels. |

History

• Statutory Authority: RCW 19.27A.025, 19.27A.045, 19.27A.160 and 19.27.074. WSR 16-13-088, § 51-11C-610337, filed 6/15/16, effective 7/16/16. Statutory Authority: RCW 19.27A.025, 19.27A.160, and 19.27.074. WSR 16-03-072, § 51-11C-610337, filed 1/19/16, effective 7/1/16. Statutory Authority: RCW 19.27A.020, 19.27A.025 and chapters 19.27 and 34.05 RCW. WSR 13-04-056, § 51-11C-610337, filed 2/1/13, effective 7/1/13.

Wash. Admin. Code § 51-11C-61040 Section A104—Below-grade walls and slabs.

History

• Statutory Authority: RCW 19.27A.020, 19.27A.025 and chapters 19.27 and 34.05 RCW. WSR 13-04-056, § 51-11C-61040, filed 2/1/13, effective 7/1/13.

Wash. Admin. Code § 51-11C-61041 Section A104.1—General.

A104.1 General. Table A104.1 lists heat loss coefficients for below-grade walls and floors.

Coefficients for below-grade walls are given as U-factors (Btu/h • ft2 • °F of wall area). Coefficients for below-grade slabs are listed as F-factors (Btu/h • ft • °F per lineal foot of slab perimeter).

Below-grade wall U-factors are only valid when used with the accompanying below-grade slab F-factor, and vice versa.

Table A104.1

Default Wall U-factors and Slab F-factors for Basements

| | Below Grade Wall U-factor | Below Grade Slab F-factor | | --- | --- | --- | | 2 Foot Depth Below Grade | | | | Uninsulated | 0.331 | 0.58 | | R-11 Interior | 0.063 | 0.67 | | R-11 Interior w/TB | 0.065 | 0.59 | | R-19 Interior | 0.042 | 0.68 | | R-19 Interior w/TB | 0.045 | 0.59 | | R-21 Interior | 0.040 | 0.68 | | R-21 Interior w/TB | 0.042 | 0.59 | | R-21+R-5 ci Interior | 0.031 | 0.68 | | R-21+R-5 Interior w/TB | 0.032 | 0.59 | | R-21 plus R-7 ci Interior | 0.029 | 0.68 | | R-21+R-7 Interior w/TB | 0.030 | 0.59 | | R-10 Exterior | 0.089 | 0.56 | | R-12 Exterior | 0.061 | 0.60 | | 3.5 Foot Depth Below Grade | | | | Uninsulated | 0.271 | 0.51 | | R-11 Interior | 0.058 | 0.61 | | R-11 Interior w/TB | 0.061 | 0.55 | | R-19 Interior | 0.041 | 0.62 | | R-19 Interior w/TB | 0.042 | 0.55 | | R-21 Interior | 0.038 | 0.63 | | R-21 Interior w/TB | 0.040 | 0.56 | | R-21+R-5 Interior | 0.030 | 0.632 | | R-21+R-5 Interior w/TB | 0.031 | 0.56 | | R-21 plus R-7 ci | 0.027 | 0.63 | | R-21 plus R-7 ci w/TB | 0.029 | 0.56 | | R-10 Exterior | 0.075 | 0.52 | | R-12 Exterior | 0.057 | 0.57 | | 7 Foot Depth Below Grade | | | | Uninsulated | 0.185 | 0.43 | | R-11 Interior | 0.051 | 0.541 | | R-11 Interior w/TB | 0.053 | 0.49 | | R-19 Interior | 0.036 | 0.54 | | R-19 Interior w/TB | 0.037 | 0.50 | | R-21 Interior | 0.035 | 0.56 | | R-21 Interior w/TB | 0.035 | 0.50 | | R-21+R-5 Interior | 0.027 | 0.56 | | R-21+R-5 Interior w/TB | 0.028 | 0.51 | | R-21+R-7 Interior | 0.025 | 0.57 | | R-21+R-7 Interior w/TB | 0.026 | 0.51 | | R-10 Exterior | 0.058 | 0.47 | | R-12 Exterior | 0.050 | 0.42 |

| TB = R-5 Thermal Break | | --- |

History

• Statutory Authority: RCW 19.27A.020, 19.27A.045, 19.27A.160 and chapter 19.27 RCW. WSR 20-01-047, § 51-11C-61041, filed 12/9/19, effective 7/1/20. Statutory Authority: RCW 19.27A.020, 19.27A.025 and chapters 19.27 and 34.05 RCW. WSR 13-04-056, § 51-11C-61041, filed 2/1/13, effective 7/1/13.

Wash. Admin. Code § 51-11C-61042 Section A104.2—Component description.

A104.2 Component description. All below-grade walls are assumed to be 8 inch concrete. The wall is assumed to extend from the slab upward to the top of the mud sill for the distance specified in Table A104.1, with 6 inches of concrete wall extending above grade.

Interior insulation is assumed to be fiberglass batts placed in the cavity formed by 2 x 4 framing on 24 inch centers with 1/2 inch gypsum board as the interior finish material. Exterior insulation is assumed to be applied directly to the exterior of the below-grade wall from the top of the wall to the footing. The exterior case does not assume any interior framing or sheetrock.

In all cases, the entire wall surface is assumed to be insulated to the indicated nominal level with the appropriate framing and insulation application. Coefficients are listed for wall depths of 2, 3-1/2 and 7 feet below grade. Basements shallower than two feet should use on-grade slab coefficients.

Heat-loss calculations for wall areas above-grade should use above-grade wall U-factors, beginning at the mudsill.

History

• Statutory Authority: RCW 19.27A.020, 19.27A.025 and chapters 19.27 and 34.05 RCW. WSR 13-04-056, § 51-11C-61042, filed 2/1/13, effective 7/1/13.

Wash. Admin. Code § 51-11C-61043 Section A104.3—Insulation description.

A104.3 Insulation description. Coefficients are listed for the following four configurations:

1. Uninsulated: No insulation or interior finish.

2. Interior insulation: Interior 2 x 4 insulated wall without a thermal break between concrete wall and slab.

3. Interior insulation with thermal break: Interior 2 x 4 insulated wall with R-5 rigid board providing a thermal break between the concrete wall and the slab.

4. Exterior insulation: Insulation applied directly to the exterior surface of the concrete wall.

History

• Statutory Authority: RCW 19.27A.020, 19.27A.025 and chapters 19.27 and 34.05 RCW. WSR 13-04-056, § 51-11C-61043, filed 2/1/13, effective 7/1/13.

Wash. Admin. Code § 51-11C-61050 Section A105—Floors over unconditioned space.

History

• Statutory Authority: RCW 19.27A.020, 19.27A.025 and chapters 19.27 and 34.05 RCW. WSR 13-04-056, § 51-11C-61050, filed 2/1/13, effective 7/1/13.

Wash. Admin. Code § 51-11C-61051 Section A105.1—General.

A105.1 General. Tables A105.1(1), A105.1(2) and A105.1(3) list heat loss coefficients for floors over unconditioned spaces in units of Btu/h • ft2 • °F.

They are derived from procedures listed in the ASHRAE Fundamentals Handbook, assuming an average outdoor temperature of 45°F, an average indoor temperature of 65°F and a crawlspace area of 1350 ft2 and 100 feet of perimeter. The crawlspace is assumed to be 2.5 feet high, with 24 inches below grade and 6 inches above grade.

Table A105.1(1)

Default U-factors for Wood-Framed Floors

over Vented Crawlspace or

Unheated Basement

| Nominal R-value | U-factor | | | | | --- | --- | --- | --- | --- | | Floor | Perimeter | Post & Beam | Joists | | | 0 | 0 11 19 30 | | 0.112 0.100 0.098 0.093 | 0.134 0.116 0.114 0.107 | | 11 | 0 11 | | 0.052 0.048 | 0.056 0.052 | | 19 | 0 11 | | 0.038 0.036 | 0.041 0.038 | | 22 | 0 11 | | 0.034 0.033 | 0.037 0.035 | | 25 | 0 11 | | 0.032 0.031 | 0.034 0.033 | | 30 | 0 11 | | 0.028 0.027 | 0.029 0.028 | | 38 | 0 11 | | 0.024 0.024 | 0.025 0.024 |

Table A105.1(2)

Default U-factors for Wood-Framed Floors over Heated Plenum Crawlspaces

| Nominal R-value Perimeter | U-factor | | --- | --- | | 11 | 0.085 | | 19 | 0.075 | | 30 | 0.069 |

| Note: | Crawlspaces used as heated plenums have approximately 30 percent higher heat loss rate than unvented crawlspaces with the same assumed ACH. Default U-factors in Table A105.1(2) reflect this higher rate of heat loss. | | --- | --- |

Table A105.1(3)

Default U-factors for Exposed Floors

| Nominal R-value | U-factor | | | | --- | --- | --- | --- | | Concrete | Wood Joist | Metal Joist | | | R-11 | 0.077 | 0.088 | 0.14 | | R-15 | 0.059 | 0.076 | 0.12 | | R-19 | 0.048 | 0.062 | 0.11 | | R-21 | 0.043 | 0.057 | 0.11 | | R-25 | 0.037 | 0.051 | 0.10 | | R-30 | 0.031 | 0.040 | 0.09 | | R-38 | 0.025 | 0.034 | 0.08 |

History

• Statutory Authority: RCW 19.27A.025, 19.27A.160, and 19.27.074. WSR 16-03-072, § 51-11C-61051, filed 1/19/16, effective 7/1/16. Statutory Authority: RCW 19.27A.020, 19.27A.025 and chapters 19.27 and 34.05 RCW. WSR 13-04-056, § 51-11C-61051, filed 2/1/13, effective 7/1/13.

Wash. Admin. Code § 51-11C-61052 Section A105.2—Crawlspace description.

A105.2 Crawlspace description. Four configurations are considered: Naturally ventilated crawlspace, mechanically vented crawlspace, heated plenum crawlspace and exposed floor.

A105.2.1 Naturally ventilated crawlspaces. Assumed to have 3.0 air changes per hour, with at least 1.0 ft2 of net-free ventilation in the foundation for every 300 ft2 of crawlspace floor area. The crawlspace is not actively heated. Floors over unheated areas, such as garages, may only use those values which have R-0 perimeter insulation.

A105.2.2 Mechanically ventilated crawlspaces. Assume to have 1.5 air changes per hour, with less than 1.0 ft2 of net-free ventilation in the foundation for every 300 ft2 of crawlspace floor area. The crawlspace is not actively heated. Floors over unheated basements may only use those values which have R-0 perimeter insulation.

A105.2.3 Heated plenum crawlspaces. Assumed to have 0.25 air changes per hour, with no foundation vents. Heated supply air from central furnace is blown into a crawlspace and allowed to enter the living space unducted via holes cut into the floor.

A105.2.4 Exposed floors. Assumes no buffer space, and a covering of 1/2 inch T1-11 on the exterior of the cavity exposed to the outside air or rigid insulation below a concrete floor, such as over parking garages.

History

• Statutory Authority: RCW 19.27A.020, 19.27A.025 and chapters 19.27 and 34.05 RCW. WSR 13-04-056, § 51-11C-61052, filed 2/1/13, effective 7/1/13.

Wash. Admin. Code § 51-11C-61053 Section A105.3—Construction description.

A105.3 Construction description. Floors are assumed to be either joisted floors framed on 16 inch centers, or post and beam on 4 foot by 8 foot squares. Insulation is assumed to be installed under the subflooring between the joists or beams with no space between the insulation and the subfloor. Insulation is assumed to be uncompressed. Exposed floors also include concrete with continuous rigid insulation assumed.

Perimeter insulation is assumed to extend from the top of the rim joist to the crawlspace floor and then inward along the ground (on top of the ground cover) for at least 24 inches.

Floor coverings are assumed to be light carpet with rubber pad.

History

• Statutory Authority: RCW 19.27A.020, 19.27A.025 and chapters 19.27 and 34.05 RCW. WSR 13-04-056, § 51-11C-61053, filed 2/1/13, effective 7/1/13.

Wash. Admin. Code § 51-11C-61060 Section A106—On-grade slab floors.

History

• Statutory Authority: RCW 19.27A.020, 19.27A.025 and chapters 19.27 and 34.05 RCW. WSR 13-04-056, § 51-11C-61060, filed 2/1/13, effective 7/1/13.

Wash. Admin. Code § 51-11C-61061 Section A106.1—General.

A106.1 General. Table A106.1 lists heat loss coefficients for heated on-grade slab floors, in units of Btu/h • °F per lineal foot of perimeter.

Table A106.1

Default F-factors for On-Grade Slabs

| Insulation Type | R-0 | R-5 | R-10 | R-15 | R-20 | R-30 | | --- | --- | --- | --- | --- | --- | --- | | | | | Unheated Slab | | | | | Uninsulated slab | 0.73 | — | — | — | — | — | | 2 ft. Horizontal (No thermal break) | — | 0.70 | 0.70 | 0.69 | — | — | | 4 ft. Horizontal (No thermal break) | — | 0.67 | 0.64 | 0.63 | — | — | | 2 ft. Vertical | — | 0.58 | 0.54 | 0.52 | — | — | | 4 ft. Vertical | — | 0.54 | 0.48 | 0.45 | — | — | | Fully insulated slab* | — | — | 0.36 | 0.31 | 0.26 | 0.21 | | | | | Heated Slab | | | | | Uninsulated slab | 0.84 | — | — | — | — | — | | Fully insulated slab* | — | 0.74 | 0.55 | 0.44 | 0.39 | 0.32 | | R-5 Center (With perimeter insulation) | — | — | 0.66 | 0.62 | — | — | | R-10 Center (With perimeter insulation) | — | — | — | 0.51 | — | — | | 3 ft. Vertical | — | — | 0.78 | — | — | — |

| * | Edge insulation R-10 regardless of the below slab insulation level. | | --- | --- |

History

• Statutory Authority: RCW 19.27A.020, 19.27A.025 and chapters 19.27 and 34.05 RCW. WSR 13-04-056, § 51-11C-61061, filed 2/1/13, effective 7/1/13.

Wash. Admin. Code § 51-11C-61062 Section A106.2—Component description.

A106.2 Component description. All on-grade slab floors are assumed to be 6 inch concrete poured directly onto the earth. The bottom of the slab is assumed to be at grade line. Monolithic and floating slabs are not differentiated.

Soil is assumed to have a conductivity of 0.75 Btu/h • ft2 • °F. Slabs 2 feet or more below grade should use basement coefficients.

History

• Statutory Authority: RCW 19.27A.020, 19.27A.025 and chapters 19.27 and 34.05 RCW. WSR 13-04-056, § 51-11C-61062, filed 2/1/13, effective 7/1/13.

Wash. Admin. Code § 51-11C-61063 Section A106.3—Insulation description.

A106.3 Insulation description. Coefficients are provided for the following three configurations:

1. Two foot (or four foot) vertical: Insulation is applied directly to the slab exterior, extending downward from the top of the slab to a depth of 2 feet (or 4 feet) below grade.

2. Two foot (or four foot) horizontal: Insulation is applied directly to the underside of the slab, and run horizontally from the perimeter inward for 2 feet (or 4 feet). The slab edge is exposed in this configuration.

| Note: | A horizontal installation with a thermal break of at least R-5 at the slab edge should use the vertical-case F-factors. | | --- | --- |

3. Fully insulated slab: Insulation extends from the top of the slab, along the entire perimeter, and completely covers the area under the slab. Thicker perimeter insulation covers the slab edge and extends 2 feet under the slab.

History

• Statutory Authority: RCW 19.27A.020, 19.27A.025 and chapters 19.27 and 34.05 RCW. WSR 13-04-056, § 51-11C-61063, filed 2/1/13, effective 7/1/13.

Wash. Admin. Code § 51-11C-61070 Section A107—Default U-factors for doors.

History

• Statutory Authority: RCW 19.27A.020, 19.27A.025 and chapters 19.27 and 34.05 RCW. WSR 13-04-056, § 51-11C-61070, filed 2/1/13, effective 7/1/13.

Wash. Admin. Code § 51-11C-61071 Section A107.1—Doors without NFRC certification.

A107.1 Doors without NFRC certification. Doors that do not have NFRC certification shall be assigned the appropriate U-factor from Tables A107.1(1) through A107.1(4).

History

• Statutory Authority: RCW 19.27A.020, 19.27A.025 and chapters 19.27 and 34.05 RCW. WSR 13-04-056, § 51-11C-61071, filed 2/1/13, effective 7/1/13.

Wash. Admin. Code § 51-11C-610711 Table A107.1(1)—Default U-factors for doors.

Table A107.1(1)

Default U-factors for Doors

| Door Type | No Glazed Fenestration | Single Glazing | Double Glazing with 1/4 in. Airspace | Double Glazing with 1/2 in. Airspace | Double Glazing with e = 0.10, 1/2 in. Argon | | | --- | --- | --- | --- | --- | --- | --- | | Swinging Doors (Rough opening - 38 in. x 82 in.) | | | | | | | | Slab Doors | | | | | | | | Wood slab in wood framea | 0.46 | | | | | | | | 6% glazed fenestration (22 in. x 8 in. lite) | - | 0.48 | 0.47 | 0.46 | 0.44 | | | 25% glazed fenestration (22 in. x 36 in. lite) | - | 0.58 | 0.48 | 0.46 | 0.42 | | | 45% glazed fenestration (22 in. x 64 in. lite) | - | 0.69 | 0.49 | 0.46 | 0.39 | | | More than 50% glazed fenestration | | Use Table C303.1.3(1)/R303.1.3(1) as appropriate | | | | | Insulated steel slab with wood edge in wood framea | 0.16 | | | | | | | | 6% glazed fenestration (22 in. x 8 in. lite) | - | 0.21 | 0.20 | 0.19 | 0.18 | | | 25% glazed fenestration (22 in. x 36 in. lite) | - | 0.39 | 0.28 | 0.26 | 0.23 | | | 45% glazed fenestration (22 in. x 64 in. lite) | - | 0.58 | 0.38 | 0.35 | 0.26 | | | More than 50% glazed fenestration | | Use Table C303.1.3(1)/R303.1.3(1) as appropriate | | | | | Foam insulated steel slab with metal edge in steel frameb | 0.37 | | | | | | | | 6% glazed fenestration (22 in. x 8 in. lite) | - | 0.44 | 0.42 | 0.41 | 0.39 | | | 25% glazed fenestration (22 in. x 36 in. lite) | - | 0.55 | 0.50 | 0.48 | 0.44 | | | 45% glazed fenestration (22 in. x 64 in. lite) | - | 0.71 | 0.59 | 0.56 | 0.48 | | | More than 50% glazed fenestration | | Use Table C303.1.3(1)/R303.1.3(1) as appropriate | | | | | Cardboard honeycomb slab with metal edge in steel frameb | 0.61 | | | | | | | Style and Rail Doors | | | | | | | | | Sliding glass doors/French doors | | Use Table C303.1.3(1)/R303.1.3(1) as appropriate | | | | | Site-Assembled Style and Rail Doors | | | | | | | | | Aluminum in aluminum frame | - | 1.32 | 0.99 | 0.93 | 0.79 | | | Aluminum in aluminum frame with thermal break | - | 1.13 | 0.80 | 0.74 | 0.63 |

| Note: | Appendix A Tables A107.1(2) through A107.1(4) may also be used if applicable. | | --- | --- | | | a Thermally broken sill (add 0.03 for nonthermally broken sill). | | | b Nonthermally broken sill. |

History

• Statutory Authority: RCW 19.27A.025, 19.27A.045, 19.27.020, and 19.27.074. WSR 14-24-122, § 51-11C-610711, filed 12/3/14, effective 1/3/15. Statutory Authority: RCW 19.27A.020, 19.27A.025 and chapters 19.27 and 34.05 RCW. WSR 13-04-056, § 51-11C-610711, filed 2/1/13, effective 7/1/13.

Wash. Admin. Code § 51-11C-610712 Table A107.1(2)—Default U-factors for revolving doors.

Table A107.1(2)

Default U-factors for Revolving Doors

| Revolving Doors | | | --- | --- | | Size (W x H) | U-Factor | | 3-wing 8 ft. x 7 ft. 10 ft. x 8 ft. | 0.79 0.80 | | 4-wing 7 ft. x 6.5 ft. 7 ft. x 7.5 ft. | 0.63 0.64 | | Open 82 in. x 84 in. | 1.32 |

History

• Statutory Authority: RCW 19.27A.020, 19.27A.025 and chapters 19.27 and 34.05 RCW. WSR 13-04-056, § 51-11C-610712, filed 2/1/13, effective 7/1/13.

Wash. Admin. Code § 51-11C-610713 Table A107.1(3)—Default U-factors for steel emergency doors.

Table A107.1(3)

Default U-factors for Steel Emergency Doors

| Double-skin Steel Emergency Exit Doors | | | | --- | --- | --- | | Core Insulation | 3 ft. x 6 ft. 8 in. | 6 ft. x 6 ft. 8 in. | | 1-3/8 in. thickness Honeycomb kraft paper Mineral wool, steel ribs Polyurethane foam | 0.57 0.44 0.34 | 0.52 0.36 0.28 | | 1-3/4 in. thickness Honeycomb kraft paper Mineral wool, steel ribs Polyurethane foam | 0.57 0.41 0.31 | 0.54 0.33 0.26 | | 1-3/8 in. thickness Honeycomb kraft paper Mineral wool, steel ribs Polyurethane foam | 0.60 0.47 0.37 | 0.55 0.39 0.31 | | 1-3/4 in. thickness Honeycomb kraft paper Mineral wool, steel ribs Polyurethane foam | 0.60 0.44 0.34 | 0.57 0.37 0.30 |

History

• Statutory Authority: RCW 19.27A.020, 19.27A.025 and chapters 19.27 and 34.05 RCW. WSR 13-04-056, § 51-11C-610713, filed 2/1/13, effective 7/1/13.

Wash. Admin. Code § 51-11C-610714 Table A107.1(4)—Default U-factors for steel garage and hangar doors.

Table A107.1(4)

Default U-factors for Steel Garage and Hangar Doors

| Double-skin Steel Garage and Aircraft Hangar Doors | | | | | | | --- | --- | --- | --- | --- | --- | | | One-piece tilt-upa | Sectional tilt-upb | Aircraft hangar | | | | Insulatione | 8 ft. x 7 ft. | 16 ft. x 7 ft. | 9 ft. x 7 ft. | 72 ft. x 12 ft.c | 240 ft. x 50 ft.d | | 1-3/8 in. thickness XPS, steel ribs EPS, steel ribs | 0.36 0.33 | 0.33 0.31 | 0.34 - 0.39 0.31 - 0.36 | | | | 2 in. thickness XPS, steel ribs EPS, steel ribs | 0.31 0.29 | 0.28 0.26 | 0.29 - 0.33 0.27 - 0.31 | | | | 3 in. thickness XPS, steel ribs EPS, steel ribs | 0.26 0.24 | 0.23 0.21 | 0.25 - 0.28 0.24 - 0.27 | | | | 4 in. thickness XPS, steel ribs EPS, steel ribs | 0.23 0.21 | 0.20 0.19 | 0.23 - 0.25 0.21 - 0.24 | | | | 6 in. thickness XPS, steel ribs EPS, steel ribs | 0.20 0.19 | 0.16 0.15 | 0.20 - 0.21 0.19 - 0.21 | | | | 4 in. thickness Noninsulated Expanded polystyrene Mineral wool, steel ribs Extruded polystyrene | | | | 1.10 0.25 0.25 0.23 | 1.23 0.16 0.16 0.15 | | 6 in. thickness Noninsulated Expanded polystyrene Mineral wool, steel ribs Extruded polystyrene | | | | 1.10 0.21 0.23 0.20 | 1.23 0.13 0.13 0.12 | | Uninsulated All products | 1.15 | | | | |

| a | Values are for thermally broken or thermally unbroken doors. | | --- | --- | | b | Lower values are for thermally broken doors; upper values are for doors with no thermal break. | | c | Typical size for a small private airplane (single-engine or twin). | | d | Typical hangar door for a midsize commercial jet airliner. | | e | XPS is extruded polystyrene, EPS is expanded polystyrene. |

History

• Statutory Authority: RCW 19.27A.025, 19.27A.045, 19.27.020, and 19.27.074. WSR 14-24-122, § 51-11C-610714, filed 12/3/14, effective 1/3/15. Statutory Authority: RCW 19.27A.020, 19.27A.025 and chapters 19.27 and 34.05 RCW. WSR 13-04-056, § 51-11C-610714, filed 2/1/13, effective 7/1/13.

Wash. Admin. Code § 51-11C-61080 Section A108—Air infiltration.

History

• Statutory Authority: RCW 19.27A.020, 19.27A.025 and chapters 19.27 and 34.05 RCW. WSR 13-04-056, § 51-11C-61080, filed 2/1/13, effective 7/1/13.

Wash. Admin. Code § 51-11C-61081 Section A108.1—General.

A108.1 General. Tables A108.1(1) and A108.1(2) list effective air change rates and heat capacities for heat loss due to infiltration for Single-Family Residential.

The estimated seasonal average infiltration rate in air changes per hour (ACH) is given for standard air-leakage control (see Section R402.4 for air leakage requirements for Single-Family Residential). The effective air change rate shall be used in calculations for compliance under either the Component Performance or Systems Analysis approaches.

Heat loss due to infiltration shall be computed using the following equation:

| Qinfil | = | ACHeff * HCP | | --- | --- | --- | | Where: | | | | Qinfil | = | Heat loss due to air infiltration. | | ACHeff | = | The effective air infiltration rate in Table A108.1(1) | | HCP | = | The Heat Capacity Density Product for the appropriate elevation or climate zone as given below. |

Table A108.1(1)

Assumed Effective Air Changes

per Hour

| Air-Leakage | Air Changes per Hour | | | --- | --- | --- | | Control Package | Natural | Effective | | Standard | 0.35 | 0.35 |

Table A108.1(2)

Default Heat Capacity/Density

Product for Air

| Zone | Average Elevation | Heat Capacity/Density | | --- | --- | --- | | 1 | Mean Sea Level | 0.0180 Btu/h • °F | | 2 | 2000 | 0.0168 Btu/h • °F | | 3 | 3000 | 0.0162 Btu/h • °F |

History

• Statutory Authority: RCW 19.27A.020, 19.27A.025 and chapters 19.27 and 34.05 RCW. WSR 13-04-056, § 51-11C-61081, filed 2/1/13, effective 7/1/13.

Wash. Admin. Code § 51-11C-70000 Appendix B—Default internal load values and schedules.

History

• Statutory Authority: RCW 19.27A.020, 19.27A.025 and chapters 19.27 and 34.05 RCW. WSR 13-04-056, § 51-11C-70000, filed 2/1/13, effective 7/1/13.

Wash. Admin. Code § 51-11C-71010 Section B101—General.

B101.1 Scope. The following default internal load values and schedules shall apply to Section C407.

History

• Statutory Authority: RCW 19.27A.020, 19.27A.025 and chapters 19.27 and 34.05 RCW. WSR 13-04-056, § 51-11C-71010, filed 2/1/13, effective 7/1/13.

Wash. Admin. Code § 51-11C-71020 Section B102—Default tables of internal loads.

B102 Default tables of internal loads. Default occupancy densities, receptacle power densities and service hot water consumption are included in Table B102.

History

• Statutory Authority: RCW 19.27A.020, 19.27A.025 and chapters 19.27 and 34.05 RCW. WSR 13-04-056, § 51-11C-71020, filed 2/1/13, effective 7/1/13.

Wash. Admin. Code § 51-11C-71021 Table B102—Acceptable occupancy densities, receptacle power densities and service hot water consumption.

Table B102

Acceptable Occupancy Densities, Receptacle Power Densities

and Service Hot Water Consumptiona

| Building Type | Occupancy Densityb ft2/Person (Btu/h • ft2) | Receptacle Power Densityc, Watts/ft2 (Btu/h • ft2) | Service Hot Water Quantitiesd Btu/h per person | | --- | --- | --- | --- | | Assembly | 50 (4.60) | 0.25 (0.85) | 215 | | Health/Institutional | 200 (1.15) | 1.00 (3.41) | 135 | | Hotel/Motel | 250 (0.92) | 0.25 (0.85) | 1,110 | | Light Manufacturing | 750 (0.31) | 0.20 (0.68) | 225 | | Office | 275 (0.84) | 0.75 (2.56) | 175 | | Parking Garage | NA | NA | NA | | Restaurant | 100 (2.30) | 0.10 (0.34) | 390 | | Retail | 300 (3.07) | 0.25 (0.85) | 135 | | School | 75 (3.07) | 0.50 (1.71) | 215 | | Warehouse | 15,000 (0.02) | 0.10 (0.34) | 225 |

| a | The occupancy densities, receptacle power densities, and service hot water consumption values are from ASHRAE Standard 90.1-1989 and addenda. | | --- | --- | | b | Values are in square feet of conditioned floor area per person. Heat generation in Btu per person per hour is 230 sensible and 190 latent. Figures in parenthesis are equivalent Btu per hour per square foot. | | c | Values are in watts per square foot of conditioned floor area. Figures in parenthesis are equivalent Btu per hour per square foot. These values are the minimum acceptable. If other process loads are not input (such as for computers, cooking, refrigeration, etc.), it is recommended that receptacle power densities be increased until total process energy consumption is equivalent to 25 percent of the total. | | d | Values are in Btu per person per hour. |

History

• Statutory Authority: RCW 19.27A.020, 19.27A.025 and chapters 19.27 and 34.05 RCW. WSR 13-04-056, § 51-11C-71021, filed 2/1/13, effective 7/1/13.

Wash. Admin. Code § 51-11C-71030 Section B103—Default schedules.

B103 Default schedules. Default schedules for occupancy, lighting, receptacles, HVAC, service hot water, and elevators are included in Tables B103(1) through B103(10).

History

• Statutory Authority: RCW 19.27A.020, 19.27A.025 and chapters 19.27 and 34.05 RCW. WSR 13-04-056, § 51-11C-71030, filed 2/1/13, effective 7/1/13.

Wash. Admin. Code § 51-11C-71031 Table B103(1)—Assembly occupancy.

Table B103(1)

Assembly Occupancya

| | Schedule for Occupancy | Schedule for Lightingb/ Receptacle | | Schedule for Service Hot Water | Schedule for Elevator | | | | | | | | | | | | | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | | Hour of Day (time) | Percent of Maximum Load | Percent of Maximum Load | Schedule for HVAC System | Percent of Maximum Load | Percent of Maximum Load | | | | | | | | | | | | | | Wk | Sat | Sun | Wk | Sat | Sun | Wk | Sat | Sun | Wk | Sat | Sun | Wk | Sat | Sun | | | 1 | (12-1am) | 0 | 0 | 0 | 5 | 5 | 5 | Off | Off | Off | 0 | 0 | 0 | 0 | 0 | 0 | | 2 | (1-2am) | 0 | 0 | 0 | 5 | 5 | 5 | Off | Off | Off | 0 | 0 | 0 | 0 | 0 | 0 | | 3 | (2-3am) | 0 | 0 | 0 | 5 | 5 | 5 | Off | Off | Off | 0 | 0 | 0 | 0 | 0 | 0 | | 4 | (3-4am) | 0 | 0 | 0 | 5 | 5 | 5 | Off | Off | Off | 0 | 0 | 0 | 0 | 0 | 0 | | 5 | (4-5am) | 0 | 0 | 0 | 5 | 5 | 5 | Off | Off | Off | 0 | 0 | 0 | 0 | 0 | 0 | | 6 | (5-6am) | 0 | 0 | 0 | 5 | 5 | 5 | On | Off | Off | 0 | 0 | 0 | 0 | 0 | 0 | | 7 | (6-7am) | 0 | 0 | 0 | 35/40 | 5 | 5 | On | On | On | 0 | 0 | 0 | 0 | 0 | 0 | | 8 | (7-8am) | 0 | 0 | 0 | 35/40 | 30 | 30 | On | On | On | 0 | 0 | 0 | 0 | 0 | 0 | | 9 | (8-9am) | 20 | 20 | 10 | 35/40 | 30 | 30 | On | On | On | 0 | 0 | 0 | 0 | 0 | 0 | | 10 | (9-10am) | 20 | 20 | 10 | 65/75 | 40/50 | 30 | On | On | On | 5 | 5 | 5 | 0 | 0 | 0 | | 11 | (10-11am) | 20 | 20 | 10 | 65/75 | 40/50 | 30 | On | On | On | 5 | 5 | 5 | 0 | 0 | 0 | | 12 | (11-12pm) | 80 | 60 | 10 | 65/75 | 40/50 | 30 | On | On | On | 35 | 20 | 10 | 0 | 0 | 0 | | 13 | (12-1pm) | 80 | 60 | 10 | 65/75 | 40/50 | 55/65 | On | On | On | 5 | 0 | 0 | 0 | 0 | 0 | | 14 | (1-2pm) | 80 | 60 | 70 | 65/75 | 40/50 | 55/65 | On | On | On | 5 | 0 | 0 | 0 | 0 | 0 | | 15 | (2-3pm) | 80 | 60 | 70 | 65/75 | 40/50 | 55/65 | On | On | On | 5 | 0 | 0 | 0 | 0 | 0 | | 16 | (3-4pm) | 80 | 60 | 70 | 65/75 | 40/50 | 55/65 | On | On | On | 5 | 0 | 0 | 0 | 0 | 0 | | 17 | (4-5pm) | 80 | 60 | 70 | 65/75 | 40/50 | 55/65 | On | On | On | 5 | 0 | 0 | 0 | 0 | 0 | | 18 | (5-6pm) | 80 | 60 | 70 | 65/75 | 40/50 | 55/65 | On | On | On | 0 | 0 | 0 | 0 | 0 | 0 | | 19 | (6-7pm) | 20 | 60 | 70 | 65/75 | 40/50 | 55/65 | On | On | On | 0 | 0 | 0 | 0 | 0 | 0 | | 20 | (7-8pm) | 20 | 60 | 70 | 65/75 | 40/50 | 55/65 | On | On | On | 0 | 65 | 65 | 0 | 0 | 0 | | 21 | (8-9pm) | 20 | 60 | 70 | 65/75 | 40/50 | 55/65 | On | On | On | 0 | 30 | 30 | 0 | 0 | 0 | | 22 | (9-10pm) | 20 | 80 | 70 | 65/75 | 40/50 | 55/65 | On | On | On | 0 | 0 | 0 | 0 | 0 | 0 | | 23 | (10-11pm) | 10 | 10 | 20 | 25 | 40/50 | 5 | On | On | On | 0 | 0 | 0 | 0 | 0 | 0 | | 24 | (11-12am) | 0 | 0 | 0 | 5 | 5 | 5 | Off | Off | Off | 0 | 0 | 0 | 0 | 0 | 0 | | | | | | | | | | | | | | | | | | | | Total/Day | 710 | 750 | 700 | 1010/1155 | 660/800 | 745/845 | 1800 | 1700 | 1700 | 70 | 125 | 115 | 0 | 0 | 0 | | | Total/Week | | 50.50 | hours | | 64.55/74.20 | hours | | 124 | hours | | 5.9 | hours | | 0 | hours | | | Total/Year | | 2633 | hours | | 3357/3869 | hours | | 6465 | hours | | 308 | hours | | 0 | hours | |

| Wk | = Weekday | | --- | --- | | a | Schedules for occupancy, lighting, receptacle, HVAC system, and service hot water are from ASHRAE Standard 90.1-1989 and addendums, except that 5 percent emergency lighting has been added for all off hours. Elevator schedules, except for restaurants, are from the U.S. Department of Energy Standard Evaluation Techniques except changed to 0 percent when occupancy is 0 percent. These values may be used only if actual schedules are not known. | | b | Lighting profiles are modified to reflect the requirement for occupancy sensors in Section C405.2. |

History

• Statutory Authority: RCW 19.27A.020, 19.27A.025 and chapters 19.27 and 34.05 RCW. WSR 13-04-056, § 51-11C-71031, filed 2/1/13, effective 7/1/13.

Wash. Admin. Code § 51-11C-71032 Table B103(2)—Health occupancy.

Table B103(2)

Health Occupancya

| | Schedule for Occupancy | Schedule for Lightingb/ Receptacle | | Schedule for Service Hot Water | Schedule for Elevator | | | | | | | | | | | | | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | | Hour of Day (time) | Percent of Maximum Load | Percent of Maximum Load | Schedule for HVAC System | Percent of Maximum Load | Percent of Maximum Load | | | | | | | | | | | | | | Wk | Sat | Sun | Wk | Sat | Sun | Wk | Sat | Sun | Wk | Sat | Sun | Wk | Sat | Sun | | | 1 | (12-1am) | 0 | 0 | 0 | 10 | 10 | 5 | On | On | On | 1 | 1 | 1 | 0 | 0 | 0 | | 2 | (1-2am) | 0 | 0 | 0 | 10 | 10 | 5 | On | On | On | 1 | 1 | 1 | 0 | 0 | 0 | | 3 | (2-3am) | 0 | 0 | 0 | 10 | 10 | 5 | On | On | On | 1 | 1 | 1 | 0 | 0 | 0 | | 4 | (3-4am) | 0 | 0 | 0 | 10 | 10 | 5 | On | On | On | 1 | 1 | 1 | 0 | 0 | 0 | | 5 | (4-5am) | 0 | 0 | 0 | 10 | 10 | 5 | On | On | On | 1 | 1 | 1 | 0 | 0 | 0 | | 6 | (5-6am) | 0 | 0 | 0 | 10 | 10 | 5 | On | On | On | 1 | 1 | 1 | 0 | 0 | 0 | | 7 | (6-7am) | 0 | 0 | 0 | 10 | 10 | 5 | On | On | On | 1 | 1 | 1 | 0 | 0 | 0 | | 8 | (7-8am) | 10 | 10 | 0 | 45/50 | 20 | 5 | On | On | On | 17 | 1 | 1 | 2 | 2 | 0 | | 9 | (8-9am) | 50 | 30 | 5 | 80/90 | 35/40 | 10 | On | On | On | 58 | 20 | 1 | 75 | 46 | 2 | | 10 | (9-10am) | 80 | 40 | 5 | 80/90 | 35/40 | 10 | On | On | On | 66 | 28 | 1 | 100 | 70 | 2 | | 11 | (10-11am) | 80 | 40 | 5 | 80/90 | 35/40 | 10 | On | On | On | 78 | 30 | 1 | 100 | 70 | 2 | | 12 | (11-12pm) | 80 | 40 | 5 | 80/90 | 35/40 | 10 | On | On | On | 82 | 30 | 1 | 100 | 70 | 2 | | 13 | (12-1pm) | 80 | 40 | 5 | 80/90 | 35/40 | 10 | On | On | On | 71 | 24 | 1 | 75 | 51 | 2 | | 14 | (1-2pm) | 80 | 40 | 5 | 80/90 | 35/40 | 10 | On | On | On | 82 | 24 | 1 | 100 | 51 | 2 | | 15 | (2-3pm) | 80 | 40 | 5 | 80/90 | 35/40 | 10 | On | On | On | 78 | 23 | 1 | 100 | 51 | 2 | | 16 | (3-4pm) | 80 | 40 | 5 | 80/90 | 35/40 | 10 | On | On | On | 74 | 23 | 1 | 100 | 51 | 2 | | 17 | (4-5pm) | 80 | 40 | 0 | 30 | 35/40 | 5 | On | On | On | 63 | 23 | 1 | 100 | 51 | 0 | | 18 | (5-6pm) | 50 | 10 | 0 | 30 | 35/40 | 5 | On | On | On | 41 | 10 | 1 | 100 | 25 | 0 | | 19 | (6-7pm) | 30 | 10 | 0 | 30 | 10 | 5 | On | On | On | 18 | 1 | 1 | 52 | 2 | 0 | | 20 | (7-8pm) | 30 | 0 | 0 | 30 | 10 | 5 | On | On | On | 18 | 1 | 1 | 52 | 0 | 0 | | 21 | (8-9pm) | 20 | 0 | 0 | 30 | 10 | 5 | On | On | On | 18 | 1 | 1 | 52 | 0 | 0 | | 22 | (9-10pm) | 20 | 0 | 0 | 30 | 10 | 5 | On | On | On | 10 | 1 | 1 | 28 | 0 | 0 | | 23 | (10-11pm) | 0 | 0 | 0 | 30 | 10 | 5 | On | On | On | 1 | 1 | 1 | 0 | 0 | 0 | | 24 | (11-12am) | 0 | 0 | 0 | 10 | 10 | 5 | On | On | On | 1 | 1 | 1 | 0 | 0 | 0 | | | | | | | | | | | | | | | | | | | | Total/Day | 850 | 380 | 40 | 975/1060 | 500/550 | 160 | 2400 | 2400 | 2400 | 783 | 249 | 24 | 1136 | 540 | 16 | | | Total/Week | | 46.70 | hours | | 55.35/60.10 | hours | | 168 | hours | | 41.88 | hours | | 62.36 | hours | | | Total/Year | | 2435 | hours | | 2878/3134 | hours | | 8760 | hours | | 2148 | hours | | 3251 | hours | |

| Wk | = Weekday | | --- | --- | | a | Schedules for occupancy, lighting, receptacle, HVAC system, and service hot water are from ASHRAE Standard 90.1-1989 and addendums, except that 5 percent emergency lighting has been added for all off hours. Elevator schedules, except for restaurants, are from the U.S. Department of Energy Standard Evaluation Techniques except changed to 0 percent when occupancy is 0 percent. These values may be used only if actual schedules are not known. | | b | Lighting profiles are modified to reflect the requirement for occupancy sensors in Section C405.2. |

History

• Statutory Authority: RCW 19.27A.020, 19.27A.025 and chapters 19.27 and 34.05 RCW. WSR 13-04-056, § 51-11C-71032, filed 2/1/13, effective 7/1/13.

Wash. Admin. Code § 51-11C-71033 Table B103(3)—Hotel/motel occupancy.

Table B103(3)

Hotel/Motel Occupancya

| | Schedule for Occupancy | Schedule for Lighting/ Receptacle | | Schedule for Service Hot Water | Schedule for Elevator | | | | | | | | | | | | | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | | Hour of Day (time) | Percent of Maximum Load | Percent of Maximum Load | Schedule for HVAC System | Percent of Maximum Load | Percent of Maximum Load | | | | | | | | | | | | | | Wk | Sat | Sun | Wk | Sat | Sun | Wk | Sat | Sun | Wk | Sat | Sun | Wk | Sat | Sun | | | 1 | (12-1am) | 90 | 90 | 70 | 20 | 20 | 30 | On | On | On | 20 | 20 | 25 | 40 | 44 | 55 | | 2 | (1-2am) | 90 | 90 | 70 | 15 | 20 | 30 | On | On | On | 15 | 15 | 20 | 33 | 35 | 55 | | 3 | (2-3am) | 90 | 90 | 70 | 10 | 10 | 20 | On | On | On | 15 | 15 | 20 | 33 | 35 | 43 | | 4 | (3-4am) | 90 | 90 | 70 | 10 | 10 | 20 | On | On | On | 15 | 15 | 20 | 33 | 35 | 43 | | 5 | (4-5am) | 90 | 90 | 70 | 10 | 10 | 20 | On | On | On | 20 | 20 | 20 | 33 | 35 | 43 | | 6 | (5-6am) | 90 | 90 | 70 | 20 | 10 | 20 | On | On | On | 25 | 25 | 30 | 33 | 35 | 43 | | 7 | (6-7am) | 70 | 70 | 70 | 40 | 30 | 30 | On | On | On | 50 | 40 | 50 | 42 | 40 | 52 | | 8 | (7-8am) | 40 | 50 | 70 | 50 | 30 | 40 | On | On | On | 60 | 50 | 50 | 42 | 32 | 52 | | 9 | (8-9am) | 40 | 50 | 50 | 40 | 40 | 40 | On | On | On | 55 | 50 | 50 | 52 | 45 | 65 | | 10 | (9-10am) | 20 | 30 | 50 | 40 | 40 | 30 | On | On | On | 45 | 50 | 55 | 52 | 45 | 65 | | 11 | (10-11am) | 20 | 30 | 50 | 25 | 30 | 30 | On | On | On | 40 | 45 | 50 | 40 | 42 | 53 | | 12 | (11-12pm) | 20 | 30 | 30 | 25 | 25 | 30 | On | On | On | 45 | 50 | 50 | 51 | 60 | 60 | | 13 | (12-1pm) | 20 | 30 | 30 | 25 | 25 | 30 | On | On | On | 40 | 50 | 40 | 51 | 65 | 53 | | 14 | (1-2pm) | 20 | 30 | 20 | 25 | 25 | 20 | On | On | On | 35 | 45 | 40 | 51 | 65 | 51 | | 15 | (2-3pm) | 20 | 30 | 20 | 25 | 25 | 20 | On | On | On | 30 | 40 | 30 | 51 | 65 | 50 | | 16 | (3-4pm) | 30 | 30 | 20 | 25 | 25 | 20 | On | On | On | 30 | 40 | 30 | 51 | 65 | 44 | | 17 | (4-5pm) | 50 | 30 | 30 | 25 | 25 | 20 | On | On | On | 30 | 35 | 30 | 63 | 65 | 64 | | 18 | (5-6pm) | 50 | 50 | 40 | 25 | 25 | 20 | On | On | On | 40 | 40 | 40 | 80 | 75 | 62 | | 19 | (6-7pm) | 50 | 60 | 40 | 60 | 60 | 50 | On | On | On | 55 | 55 | 50 | 86 | 80 | 65 | | 20 | (7-8pm) | 70 | 60 | 60 | 80 | 70 | 70 | On | On | On | 60 | 55 | 50 | 70 | 80 | 63 | | 21 | (8-9pm) | 70 | 60 | 60 | 90 | 70 | 80 | On | On | On | 50 | 50 | 40 | 70 | 75 | 63 | | 22 | (9-10pm) | 80 | 70 | 80 | 80 | 70 | 60 | On | On | On | 55 | 55 | 50 | 70 | 75 | 63 | | 23 | (10-11pm) | 90 | 70 | 80 | 60 | 60 | 50 | On | On | On | 45 | 40 | 40 | 45 | 55 | 40 | | 24 | (11-12am) | 90 | 70 | 80 | 30 | 30 | 30 | On | On | On | 25 | 30 | 20 | 45 | 55 | 40 | | | | | | | | | | | | | | | | | | | | Total/Day | 1390 | 1390 | 1300 | 855 | 785 | 810 | 2400 | 2400 | 2400 | 915 | 930 | 900 | 1217 | 1303 | 1287 | | | Total/Week | | 96.40 | hours | | 58.70 | hours | | 168.0 | hours | | 64.05 | hours | | 86.75 | hours | | | Total/Year | | 5026 | hours | | 3061 | hours | | 8760 | hours | | 3340 | hours | | 4523 | hours | |

| Wk | = Weekday | | --- | --- | | a | Schedules for occupancy, lighting, receptacle, HVAC system, and service hot water are from ASHRAE Standard 90.1-1989 and addendums, except that 5 percent emergency lighting has been added for all off hours. Elevator schedules, except for restaurants, are from the U.S. Department of Energy Standard Evaluation Techniques except changed to 0 percent when occupancy is 0 percent. These values may be used only if actual schedules are not known. |

History

• Statutory Authority: RCW 19.27A.020, 19.27A.025 and chapters 19.27 and 34.05 RCW. WSR 13-04-056, § 51-11C-71033, filed 2/1/13, effective 7/1/13.

Wash. Admin. Code § 51-11C-71034 Table B103(4)—Light manufacturing occupancy.

Table B103(4)

Light Manufacturing Occupancya

| | Schedule for Occupancy | Schedule for Lightingb/ Receptacle | | Schedule for Service Hot Water | Schedule for Elevator | | | | | | | | | | | | | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | | Hour of Day (time) | Percent of Maximum Load | Percent of Maximum Load | Schedule for HVAC System | Percent of Maximum Load | Percent of Maximum Load | | | | | | | | | | | | | | Wk | Sat | Sun | Wk | Sat | Sun | Wk | Sat | Sun | Wk | Sat | Sun | Wk | Sat | Sun | | | 1 | (12-1am) | 0 | 0 | 0 | 5 | 5 | 5 | Off | Off | Off | 5 | 5 | 4 | 0 | 0 | 0 | | 2 | (1-2am) | 0 | 0 | 0 | 5 | 5 | 5 | Off | Off | Off | 5 | 5 | 4 | 0 | 0 | 0 | | 3 | (2-3am) | 0 | 0 | 0 | 5 | 5 | 5 | Off | Off | Off | 5 | 5 | 4 | 0 | 0 | 0 | | 4 | (3-4am) | 0 | 0 | 0 | 5 | 5 | 5 | Off | Off | Off | 5 | 5 | 4 | 0 | 0 | 0 | | 5 | (4-5am) | 0 | 0 | 0 | 5 | 5 | 5 | Off | Off | Off | 5 | 5 | 4 | 0 | 0 | 0 | | 6 | (5-6am) | 0 | 0 | 0 | 10 | 5 | 5 | Off | Off | Off | 8 | 8 | 7 | 0 | 0 | 0 | | 7 | (6-7am) | 10 | 10 | 5 | 10 | 10 | 5 | On | On | Off | 7 | 7 | 4 | 0 | 0 | 0 | | 8 | (7-8am) | 20 | 10 | 5 | 30 | 10 | 5 | On | On | Off | 19 | 11 | 4 | 35 | 16 | 0 | | 9 | (8-9am) | 95 | 30 | 5 | 85/90 | 30 | 5 | On | On | Off | 35 | 15 | 4 | 69 | 14 | 0 | | 10 | (9-10am) | 95 | 30 | 5 | 85/90 | 30 | 5 | On | On | Off | 38 | 21 | 4 | 43 | 21 | 0 | | 11 | (10-11am) | 95 | 30 | 5 | 85/90 | 30 | 5 | On | On | Off | 39 | 19 | 4 | 37 | 18 | 0 | | 12 | (11-12pm) | 95 | 30 | 5 | 85/90 | 30 | 5 | On | On | Off | 47 | 23 | 6 | 43 | 25 | 0 | | 13 | (12-1pm) | 50 | 10 | 5 | 75/80 | 15 | 5 | On | On | Off | 57 | 20 | 6 | 58 | 21 | 0 | | 14 | (1-2pm) | 95 | 10 | 5 | 85/90 | 15 | 5 | On | On | Off | 54 | 19 | 9 | 48 | 13 | 0 | | 15 | (2-3pm) | 95 | 10 | 5 | 85/90 | 15 | 5 | On | On | Off | 34 | 15 | 6 | 37 | 8 | 0 | | 16 | (3-4pm) | 95 | 10 | 5 | 85/90 | 15 | 5 | On | On | Off | 33 | 12 | 4 | 37 | 4 | 0 | | 17 | (4-5pm) | 95 | 10 | 5 | 85/90 | 15 | 5 | On | On | Off | 44 | 14 | 4 | 46 | 5 | 0 | | 18 | (5-6pm) | 30 | 5 | 5 | 50 | 5 | 5 | On | On | Off | 26 | 7 | 4 | 62 | 6 | 0 | | 19 | (6-7pm) | 10 | 5 | 0 | 30 | 5 | 5 | On | Off | Off | 21 | 7 | 4 | 20 | 0 | 0 | | 20 | (7-8pm) | 10 | 0 | 0 | 30 | 5 | 5 | On | Off | Off | 15 | 7 | 4 | 12 | 0 | 0 | | 21 | (8-9pm) | 10 | 0 | 0 | 20 | 5 | 5 | On | Off | Off | 17 | 7 | 4 | 4 | 0 | 0 | | 22 | (9-10pm) | 10 | 0 | 0 | 20 | 5 | 5 | On | Off | Off | 8 | 9 | 7 | 4 | 0 | 0 | | 23 | (10-11pm) | 5 | 0 | 0 | 10 | 5 | 5 | Off | Off | Off | 5 | 5 | 4 | 0 | 0 | 0 | | 24 | (11-12am) | 5 | 0 | 0 | 5 | 5 | 5 | Off | Off | Off | 5 | 5 | 4 | 0 | 0 | 0 | | | | | | | | | | | | | | | | | | | | Total/Day | 920 | 200 | 60 | 995/1040 | 280 | 120 | 1600 | 1200 | 0 | 537 | 256 | 113 | 555 | 151 | 0 | | | Total/Week | | 48.60 | hours | | 53.75/56.00 | hours | | 92.00 | hours | | 30.54 | hours | | 29.26 | hours | | | Total/Year | | 2534 | hours | | 2795/2920 | hours | | 4797 | hours | | 1592 | hours | | 1526 | hours | |

| Wk | = Weekday | | --- | --- | | a | Schedules for occupancy, lighting, receptacle, HVAC system, and service hot water are from ASHRAE Standard 90.1-1989 and addendums, except that 5 percent emergency lighting has been added for all off hours. Elevator schedules, except for restaurants, are from the U.S. Department of Energy Standard Evaluation Techniques except changed to 0 percent when occupancy is 0 percent. These values may be used only if actual schedules are not known. | | b | Lighting profiles are modified to reflect the requirement for occupancy sensors in Section C405.2. |

History

• Statutory Authority: RCW 19.27A.020, 19.27A.025 and chapters 19.27 and 34.05 RCW. WSR 13-04-056, § 51-11C-71034, filed 2/1/13, effective 7/1/13.

Wash. Admin. Code § 51-11C-71035 Table B103(5)—Office occupancy.

Table B103(5)

Office Occupancya

| | Schedule for Occupancy | Schedule for Lightingb/ Receptacle | | Schedule for Service Hot Water | Schedule for Elevator | | | | | | | | | | | | | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | | Hour of Day (time) | Percent of Maximum Load | Percent of Maximum Load | Schedule for HVAC System | Percent of Maximum Load | Percent of Maximum Load | | | | | | | | | | | | | | Wk | Sat | Sun | Wk | Sat | Sun | Wk | Sat | Sun | Wk | Sat | Sun | Wk | Sat | Sun | | | 1 | (12-1am) | 0 | 0 | 0 | 5 | 5 | 5 | Off | Off | Off | 5 | 5 | 4 | 0 | 0 | 0 | | 2 | (1-2am) | 0 | 0 | 0 | 5 | 5 | 5 | Off | Off | Off | 5 | 5 | 4 | 0 | 0 | 0 | | 3 | (2-3am) | 0 | 0 | 0 | 5 | 5 | 5 | Off | Off | Off | 5 | 5 | 4 | 0 | 0 | 0 | | 4 | (3-4am) | 0 | 0 | 0 | 5 | 5 | 5 | Off | Off | Off | 5 | 5 | 4 | 0 | 0 | 0 | | 5 | (4-5am) | 0 | 0 | 0 | 5 | 5 | 5 | Off | Off | Off | 5 | 5 | 4 | 0 | 0 | 0 | | 6 | (5-6am) | 0 | 0 | 0 | 10 | 5 | 5 | Off | Off | Off | 8 | 8 | 7 | 0 | 0 | 0 | | 7 | (6-7am) | 10 | 10 | 5 | 10 | 10 | 5 | On | On | Off | 7 | 7 | 4 | 0 | 0 | 0 | | 8 | (7-8am) | 20 | 10 | 5 | 30 | 10 | 5 | On | On | Off | 19 | 11 | 4 | 35 | 16 | 0 | | 9 | (8-9am) | 95 | 30 | 5 | 65/90 | 30 | 5 | On | On | Off | 35 | 15 | 4 | 69 | 14 | 0 | | 10 | (9-10am) | 95 | 30 | 5 | 65/90 | 30 | 5 | On | On | Off | 38 | 21 | 4 | 43 | 21 | 0 | | 11 | (10-11am) | 95 | 30 | 5 | 65/90 | 30 | 5 | On | On | Off | 39 | 19 | 4 | 37 | 18 | 0 | | 12 | (11-12pm) | 95 | 30 | 5 | 65/90 | 30 | 5 | On | On | Off | 47 | 23 | 6 | 43 | 25 | 0 | | 13 | (12-1pm) | 50 | 10 | 5 | 55/80 | 15 | 5 | On | On | Off | 57 | 20 | 6 | 58 | 21 | 0 | | 14 | (1-2pm) | 95 | 10 | 5 | 65/90 | 15 | 5 | On | On | Off | 54 | 19 | 9 | 48 | 13 | 0 | | 15 | (2-3pm) | 95 | 10 | 5 | 65/90 | 15 | 5 | On | On | Off | 34 | 15 | 6 | 37 | 8 | 0 | | 16 | (3-4pm) | 95 | 10 | 5 | 65/90 | 15 | 5 | On | On | Off | 33 | 12 | 4 | 37 | 4 | 0 | | 17 | (4-5pm) | 95 | 10 | 5 | 65/90 | 15 | 5 | On | On | Off | 44 | 14 | 4 | 46 | 5 | 0 | | 18 | (5-6pm) | 30 | 5 | 5 | 35/50 | 5 | 5 | On | On | Off | 26 | 7 | 4 | 62 | 6 | 0 | | 19 | (6-7pm) | 10 | 5 | 0 | 30 | 5 | 5 | On | On | Off | 21 | 7 | 4 | 20 | 0 | 0 | | 20 | (7-8pm) | 10 | 0 | 0 | 30 | 5 | 5 | On | Off | Off | 15 | 7 | 4 | 12 | 0 | 0 | | 21 | (8-9pm) | 10 | 0 | 0 | 20 | 5 | 5 | On | Off | Off | 17 | 7 | 4 | 4 | 0 | 0 | | 22 | (9-10pm) | 10 | 0 | 0 | 20 | 5 | 5 | On | Off | Off | 8 | 9 | 7 | 4 | 0 | 0 | | 23 | (10-11pm) | 5 | 0 | 0 | 10 | 5 | 5 | Off | Off | Off | 5 | 5 | 4 | 0 | 0 | 0 | | 24 | (11-12am) | 5 | 0 | 0 | 5 | 5 | 5 | Off | Off | Off | 5 | 5 | 4 | 0 | 0 | 0 | | | | | | | | | | | | | | | | | | | | Total/Day | 920 | 200 | 60 | 800/1040 | 280 | 120 | 1600 | 1200 | 0 | 537 | 256 | 113 | 555 | 151 | 0 | | | Total/Week | | 48.60 | hours | | 44.00/56.00 | hours | | 92.00 | hours | | 30.54 | hours | | 29.26 | hours | | | Total/Year | | 2534 | hours | | 2288/2920 | hours | | 4797 | hours | | 1592 | hours | | 1526 | hours | |

| Wk | = Weekday | | --- | --- | | a | Schedules for occupancy, lighting, receptacle, HVAC system, and service hot water are from ASHRAE Standard 90.1-1989 and addendums, except that 5 percent emergency lighting has been added for all off hours. Elevator schedules, except for restaurants, are from the U.S. Department of Energy Standard Evaluation Techniques except changed to 0 percent when occupancy is 0 percent. These values may be used only if actual schedules are not known. | | b | Lighting profiles are modified to reflect the requirement for occupancy sensors in Section C405.2. |

History

• Statutory Authority: RCW 19.27A.020, 19.27A.025 and chapters 19.27 and 34.05 RCW. WSR 13-04-056, § 51-11C-71035, filed 2/1/13, effective 7/1/13.

Wash. Admin. Code § 51-11C-71036 Table B103(6)—Parking garage occupancy.

Table B103(6)

Parking Garage Occupancya

| Hour of Day (time) | Schedule for Occupancy Percent of Maximum Load | Schedule forLightingb/ Receptacle Percent of Maximum Load | Schedule for HVAC System | Schedule forService Hot Water Percent of Maximum Load | Schedule for Elevator Percent of Maximum Load | | | | | | | | | | | | | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | | | Wk | Sat | Sun | Wk | Sat | Sun | Wk | Sat | Sun | Wk | Sat | Sun | Wk | Sat | Sun | | | 1 | (12-1am) | | | | 50/100 | 50/100 | 50/100 | | | | | | | | | | | 2 | (1-2am) | | | | 50/100 | 50/100 | 50/100 | | | | | | | | | | | 3 | (2-3am) | | | | 50/100 | 50/100 | 50/100 | | | | | | | | | | | 4 | (3-4am) | | | | 50/100 | 50/100 | 50/100 | | | | | | | | | | | 5 | (4-5am) | | | | 50/100 | 50/100 | 50/100 | | | | | | | | | | | 6 | (5-6am) | | | | 50/100 | 50/100 | 50/100 | | | | | | | | | | | 7 | (6-7am) | | | | 100 | 100 | 50/100 | | | | | | | | | | | 8 | (7-8am) | | | | 100 | 100 | 50/100 | | | | | | | | | | | 9 | (8-9am) | | | | 100 | 100 | 50/100 | | | | | | | | | | | 10 | (9-10am) | | 100 | 100 | 50/100 | Based | | Included | | | | | | | | | | 11 | (10-11am) | | 100 | 100 | 50/100 | on | | with | | | | | | | | | | 12 | (11-12pm) | N/A | 100 | 100 | 50/100 | likely | N/A | other | | | | | | | | | | 13 | (12-1pm) | | 100 | 100 | 50/100 | use | | occupancies | | | | | | | | | | 14 | (1-2pm) | | 100 | 100 | 50/100 | | | | | | | | | | | | | 15 | (2-3pm) | | | | 100 | 100 | 50/100 | | | | | | | | | | | 16 | (3-4pm) | | | | 100 | 100 | 50/100 | | | | | | | | | | | 17 | (4-5pm) | | | | 100 | 100 | 50/100 | | | | | | | | | | | 18 | (5-6pm) | | | | 100 | 50/100 | 50/100 | | | | | | | | | | | 19 | (6-7pm) | | | | 100 | 50/100 | 50/100 | | | | | | | | | | | 20 | (7-8pm) | | | | 100 | 50/100 | 50/100 | | | | | | | | | | | 21 | (8-9pm) | | | | 100 | 50/100 | 50/100 | | | | | | | | | | | 22 | (9-10pm) | | | | 100 | 50/100 | 50/100 | | | | | | | | | | | 23 | (10-11pm) | | | | 50/100 | 50/100 | 50/100 | | | | | | | | | | | 24 | (11-12am) | | | | 50/100 | 50/100 | 50/100 | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Total/Day | | | | 2000/ 2400 | 1750/ 2400 | 1200/ 2400 | | | | | | | | | | | | Total/Week | | | | | 129.50/ 168 | hours | | | | | | | | | | | | Total/Year | | | | | 6734/ 8760 | hours | | | | | | | | | | |

| Wk | = Weekday | | --- | --- | | a | Schedules for occupancy, lighting, receptacle, HVAC system and service hot water are from ASHRAE Standard 90.1-1989 and addendums, except that 5 percent emergency lighting has been added for all off hours. Elevator schedules, except for restaurants, are from the U.S. Department of Energy Standard Evaluation Techniques except changed to 0 percent when occupancy is 0 percent. These values may be used only if actual schedules are not known. | | b | Lighting profiles are modified to reflect the requirement for occupancy sensors in Section C405.2. For parking garage lighting, the schedule has been revised to accompany the office schedule: The lighting in the parking garage is set to be on at 100 percent for all hours when the building occupancy is 10 percent or greater, but reduced to 50 percent (per Section C405.2) for all hours when the building occupancy is less than 10 percent. For a parking garage serving a use other than office, it is acceptable to modify the parking garage schedule to parallel that use. |

History

• Statutory Authority: RCW 19.27A.020, 19.27A.025 and chapters 19.27 and 34.05 RCW. WSR 13-04-056, § 51-11C-71036, filed 2/1/13, effective 7/1/13.

Wash. Admin. Code § 51-11C-71037 Table B103(7)—Restaurant occupancy.

Table B103(7)

Restaurant Occupancya

| | Schedule for Occupancy | Schedule for Lightingb/ Receptacle | | Schedule for Service Hot Water | Schedule for Elevator | | | | | | | | | | | | | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | | Hour of Day (time) | Percent of Maximum Load | Percent of Maximum Load | Schedule for HVAC System | Percent of Maximum Load | Percent of Maximum Load | | | | | | | | | | | | | | Wk | Sat | Sun | Wk | Sat | Sun | Wk | Sat | Sun | Wk | Sat | Sun | Wk | Sat | Sun | | | 1 | (12-1am) | 15 | 30 | 20 | 15 | 20 | 20 | On | On | On | 20 | 20 | 25 | 0 | 0 | 0 | | 2 | (1-2am) | 15 | 25 | 20 | 15 | 15 | 15 | On | On | On | 15 | 15 | 20 | 0 | 0 | 0 | | 3 | (2-3am) | 5 | 5 | 5 | 15 | 15 | 15 | On | On | On | 15 | 15 | 20 | 0 | 0 | 0 | | 4 | (3-4am) | 0 | 0 | 0 | 15 | 15 | 15 | Off | Off | Off | 0 | 0 | 0 | 0 | 0 | 0 | | 5 | (4-5am) | 0 | 0 | 0 | 15 | 15 | 15 | Off | Off | Off | 0 | 0 | 0 | 0 | 0 | 0 | | 6 | (5-6am) | 0 | 0 | 0 | 20 | 15 | 15 | Off | Off | Off | 0 | 0 | 0 | 0 | 0 | 0 | | 7 | (6-7am) | 0 | 0 | 0 | 35/40 | 30 | 30 | Off | Off | Off | 0 | 0 | 0 | 0 | 0 | 0 | | 8 | (7-8am) | 5 | 0 | 0 | 35/40 | 30 | 30 | On | Off | Off | 60 | 0 | 0 | 0 | 0 | 0 | | 9 | (8-9am) | 5 | 0 | 0 | 55/60 | 55/60 | 45/50 | On | Off | Off | 55 | 0 | 0 | 0 | 0 | 0 | | 10 | (9-10am) | 5 | 5 | 0 | 55/60 | 55/60 | 45/50 | On | On | Off | 45 | 50 | 0 | 0 | 0 | 0 | | 11 | (10-11am) | 20 | 20 | 10 | 85/90 | 75/80 | 65/70 | On | On | On | 40 | 45 | 50 | 0 | 0 | 0 | | 12 | (11-12pm) | 50 | 45 | 20 | 85/90 | 75/80 | 65/70 | On | On | On | 45 | 50 | 50 | 0 | 0 | 0 | | 13 | (12-1pm) | 80 | 50 | 25 | 85/90 | 75/80 | 65/70 | On | On | On | 40 | 50 | 40 | 0 | 0 | 0 | | 14 | (1-2pm) | 70 | 50 | 25 | 85/90 | 75/80 | 65/70 | On | On | On | 35 | 45 | 40 | 0 | 0 | 0 | | 15 | (2-3pm) | 40 | 35 | 15 | 85/90 | 75/80 | 65/70 | On | On | On | 30 | 40 | 30 | 0 | 0 | 0 | | 16 | (3-4pm) | 20 | 30 | 20 | 85/90 | 75/80 | 65/70 | On | On | On | 30 | 40 | 30 | 0 | 0 | 0 | | 17 | (4-5pm) | 25 | 30 | 25 | 85/90 | 75/80 | 55/60 | On | On | On | 30 | 35 | 30 | 0 | 0 | 0 | | 18 | (5-6pm) | 50 | 30 | 35 | 85/90 | 85/90 | 55/60 | On | On | On | 40 | 40 | 40 | 0 | 0 | 0 | | 19 | (6-7pm) | 80 | 70 | 55 | 85/90 | 85/90 | 55/60 | On | On | On | 55 | 55 | 50 | 0 | 0 | 0 | | 20 | (7-8pm) | 80 | 90 | 65 | 85/90 | 85/90 | 55/60 | On | On | On | 60 | 55 | 50 | 0 | 0 | 0 | | 21 | (8-9pm) | 80 | 70 | 70 | 85/90 | 85/90 | 55/60 | On | On | On | 50 | 50 | 40 | 0 | 0 | 0 | | 22 | (9-10pm) | 50 | 65 | 35 | 85/90 | 85/90 | 55/60 | On | On | On | 55 | 55 | 50 | 0 | 0 | 0 | | 23 | (10-11pm) | 35 | 55 | 20 | 45/50 | 45/50 | 45/50 | On | On | On | 45 | 40 | 40 | 0 | 0 | 0 | | 24 | (11-12am) | 20 | 35 | 20 | 30 | 30 | 30 | On | On | On | 25 | 30 | 20 | 0 | 0 | 0 | | | | | | | | | | | | | | | | | | | | Total/Day | 750 | 740 | 485 | 1370/ 1455 | 1290/ 1365 | 1040/ 1115 | 2000 | 1800 | 1700 | 790 | 730 | 625 | 0 | 0 | 0 | | | Total/Week | | 49.75 | hours | | 91.80/ 97.55 | hours | | 135 | hours | | 53.05 | hours | | 0 | hours | | | Total/Year | | 2594 | hours | | 4774/ 5086 | hours | | 7039 | hours | | 2766 | hours | | 0 | hours | |

| Wk | = Weekday | | --- | --- | | a | Schedules for occupancy, lighting, receptacle, HVAC system and service hot water are from ASHRAE Standard 90.1-1989 and addendums, except that 5 percent emergency lighting has been added for all off hours. Elevator schedules, except for restaurants, are from the U.S. Department of Energy Standard Evaluation Techniques except changed to 0 percent when occupancy is 0 percent. These values may be used only if actual schedules are not known. | | b | Lighting profiles are modified to reflect the requirement for occupancy sensors in Section C405.2. |

History

• Statutory Authority: RCW 19.27A.020, 19.27A.025 and chapters 19.27 and 34.05 RCW. WSR 13-04-056, § 51-11C-71037, filed 2/1/13, effective 7/1/13.

Wash. Admin. Code § 51-11C-71038 Table B103(8)—Retail occupancy.

Table B103(8)

Retail Occupancya

| | Schedule for Occupancy | Schedule forLightingb/Receptacle | | Schedule for Service Hot Water | Schedule for Elevator | | | | | | | | | | | | | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | | Hour of Day (time) | Percent of Maximum Load | Percent of Maximum Load | Schedule for HVAC System | Percent of Maximum Load | Percent of Maximum Load | | | | | | | | | | | | | | Wk | Sat | Sun | Wk | Sat | Sun | Wk | Sat | Sun | Wk | Sat | Sun | Wk | Sat | Sun | | | 1 | (12-1am) | 0 | 0 | 0 | 5 | 5 | 5 | Off | Off | Off | 4 | 11 | 7 | 0 | 0 | 0 | | 2 | (1-2am) | 0 | 0 | 0 | 5 | 5 | 5 | Off | Off | Off | 5 | 10 | 7 | 0 | 0 | 0 | | 3 | (2-3am) | 0 | 0 | 0 | 5 | 5 | 5 | Off | Off | Off | 5 | 8 | 7 | 0 | 0 | 0 | | 4 | (3-4am) | 0 | 0 | 0 | 5 | 5 | 5 | Off | Off | Off | 4 | 6 | 6 | 0 | 0 | 0 | | 5 | (4-5am) | 0 | 0 | 0 | 5 | 5 | 5 | Off | Off | Off | 4 | 6 | 6 | 0 | 0 | 0 | | 6 | (5-6am) | 0 | 0 | 0 | 5 | 5 | 5 | Off | Off | Off | 4 | 6 | 6 | 0 | 0 | 0 | | 7 | (6-7am) | 0 | 0 | 0 | 5 | 5 | 5 | On | On | Off | 4 | 7 | 7 | 0 | 0 | 0 | | 8 | (7-8am) | 10 | 10 | 0 | 20 | 10 | 5 | On | On | Off | 15 | 20 | 10 | 12 | 9 | 0 | | 9 | (8-9am) | 20 | 20 | 0 | 50 | 30 | 10 | On | On | On | 23 | 24 | 12 | 22 | 21 | 0 | | 10 | (9-10am) | 50 | 50 | 10 | 85/90 | 55/60 | 10 | On | On | On | 32 | 27 | 14 | 64 | 56 | 11 | | 11 | (10-11am) | 50 | 60 | 20 | 85/90 | 85/90 | 40 | On | On | On | 41 | 42 | 29 | 74 | 66 | 13 | | 12 | (11-12pm) | 70 | 80 | 20 | 85/90 | 85/90 | 40 | On | On | On | 57 | 54 | 31 | 68 | 68 | 35 | | 13 | (12-1pm) | 70 | 80 | 40 | 85/90 | 85/90 | 55/60 | On | On | On | 62 | 59 | 36 | 68 | 68 | 37 | | 14 | (1-2pm) | 70 | 80 | 40 | 85/90 | 85/90 | 55/60 | On | On | On | 61 | 60 | 36 | 71 | 69 | 37 | | 15 | (2-3pm) | 70 | 80 | 40 | 85/90 | 85/90 | 55/60 | On | On | On | 50 | 49 | 34 | 72 | 70 | 39 | | 16 | (3-4pm) | 80 | 80 | 40 | 85/90 | 85/90 | 55/60 | On | On | On | 45 | 48 | 35 | 72 | 69 | 41 | | 17 | (4-5pm) | 70 | 80 | 40 | 85/90 | 85/90 | 55/60 | On | On | On | 46 | 47 | 37 | 73 | 66 | 38 | | 18 | (5-6pm) | 50 | 60 | 20 | 85/90 | 85/90 | 40 | On | On | Off | 47 | 46 | 34 | 68 | 58 | 34 | | 19 | (6-7pm) | 50 | 20 | 10 | 55/60 | 50 | 20 | On | On | Off | 42 | 44 | 25 | 68 | 47 | 3 | | 20 | (7-8pm) | 30 | 20 | 0 | 55/60 | 30 | 5 | On | On | Off | 34 | 36 | 27 | 58 | 43 | 0 | | 21 | (8-9pm) | 30 | 20 | 0 | 50 | 30 | 5 | On | On | Off | 33 | 29 | 21 | 54 | 43 | 0 | | 22 | (9-10pm) | 0 | 10 | 0 | 20 | 10 | 5 | Off | On | Off | 23 | 22 | 16 | 0 | 8 | 0 | | 23 | (10-11pm) | 0 | 0 | 0 | 5 | 5 | 5 | Off | Off | Off | 13 | 16 | 10 | 0 | 0 | 0 | | 24 | (11-12am) | 0 | 0 | 0 | 5 | 5 | 5 | Off | Off | Off | 8 | 13 | 6 | 0 | 0 | 0 | | | | | | | | | | | | | | | | | | | | Total/Day | 750 | 750 | 280 | 1060/ 1115 | 940/ 985 | 500/ 525 | 1500 | 1600 | 900 | 662 | 690 | 459 | 844 | 761 | 288 | | | Total/Week | | 46.30 | hours | | 67.40/ 70.85 | hours | | 100 | hours | | 44.59 | hours | | 52.69 | hours | | | Total/Year | | 2414 | hours | | 3505/ 3694 | hours | | 5214 | hours | | 2325 | hours | | 2747 | hours | |

| Wk | = Weekday | | --- | --- | | a | Schedules for occupancy, lighting, receptacle, HVAC system and service hot water are from ASHRAE Standard 90.1-1989 and addendums, except that 5 percent emergency lighting has been added for all off hours. Elevator schedules, except for restaurants, are from the U.S. Department of Energy Standard Evaluation Techniques except changed to 0 percent when occupancy is 0 percent. These values may be used only if actual schedules are not known. | | b | Lighting profiles are modified to reflect the requirement for occupancy sensors in Section C405.2. |

History

• Statutory Authority: RCW 19.27A.020, 19.27A.025 and chapters 19.27 and 34.05 RCW. WSR 13-04-056, § 51-11C-71038, filed 2/1/13, effective 7/1/13.

Wash. Admin. Code § 51-11C-71039 Table B103(9)—School and warehouse occupancies.

Table B103(9)

School Occupancya

| | Schedule for Occupancy | Schedule for Lightingb/Receptacle | | Schedule for Service Hot Water | Schedule for Elevator | | | | | | | | | | | | | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | | Hour of Day (time) | Percent of Maximum Load | Percent of Maximum Load | Schedule forHVAC System | Percent of Maximum Load | Percent of Maximum Load | | | | | | | | | | | | | | | Wk | Sat | Sun | Wk | Sat | Sun | Wk | Sat | Sun | Wk | Sat | Sun | Wk | Sat | Sun | | 1 | (12-1am) | 0 | 0 | 0 | 5 | 5 | 5 | Off | Off | Off | 5 | 3 | 3 | 0 | 0 | 0 | | 2 | (1-2am) | 0 | 0 | 0 | 5 | 5 | 5 | Off | Off | Off | 5 | 3 | 3 | 0 | 0 | 0 | | 3 | (2-3am) | 0 | 0 | 0 | 5 | 5 | 5 | Off | Off | Off | 5 | 3 | 3 | 0 | 0 | 0 | | 4 | (3-4am) | 0 | 0 | 0 | 5 | 5 | 5 | Off | Off | Off | 5 | 3 | 3 | 0 | 0 | 0 | | 5 | (4-5am) | 0 | 0 | 0 | 5 | 5 | 5 | Off | Off | Off | 5 | 3 | 3 | 0 | 0 | 0 | | 6 | (5-6am) | 0 | 0 | 0 | 5 | 5 | 5 | Off | Off | Off | 5 | 3 | 3 | 0 | 0 | 0 | | 7 | (6-7am) | 0 | 0 | 0 | 5 | 5 | 5 | Off | Off | Off | 5 | 3 | 3 | 0 | 0 | 0 | | 8 | (7-8am) | 5 | 0 | 0 | 30 | 5 | 5 | On | Off | Off | 10 | 3 | 3 | 0 | 0 | 0 | | 9 | (8-9am) | 75 | 10 | 0 | 60/85 | 15 | 5 | On | On | Off | 34 | 3 | 5 | 30 | 0 | 0 | | 10 | (9-10am) | 90 | 10 | 0 | 65/95 | 15 | 5 | On | On | Off | 60 | 5 | 5 | 30 | 0 | 0 | | 11 | (10-11am) | 90 | 10 | 0 | 65/95 | 15 | 5 | On | On | Off | 63 | 5 | 5 | 30 | 0 | 0 | | 12 | (11-12pm) | 80 | 10 | 0 | 65/95 | 15 | 5 | On | On | Off | 72 | 5 | 5 | 30 | 0 | 0 | | 13 | (12-1pm) | 80 | 10 | 0 | 55/80 | 15 | 5 | On | On | Off | 79 | 5 | 5 | 30 | 0 | 0 | | 14 | (1-2pm) | 80 | 0 | 0 | 55/80 | 5 | 5 | On | Off | Off | 83 | 3 | 5 | 30 | 0 | 0 | | 15 | (2-3pm) | 80 | 0 | 0 | 55/80 | 5 | 5 | On | Off | Off | 61 | 3 | 3 | 30 | 0 | 0 | | 16 | (3-4pm) | 45 | 0 | 0 | 50/70 | 5 | 5 | On | Off | Off | 65 | 3 | 3 | 15 | 0 | 0 | | 17 | (4-5pm) | 15 | 0 | 0 | 35/50 | 5 | 5 | On | Off | Off | 10 | 3 | 3 | 0 | 0 | 0 | | 18 | (5-6pm) | 5 | 0 | 0 | 35/50 | 5 | 5 | On | Off | Off | 10 | 3 | 3 | 0 | 0 | 0 | | 19 | (6-7pm) | 15 | 0 | 0 | 35 | 5 | 5 | On | Off | Off | 19 | 3 | 3 | 0 | 0 | 0 | | 20 | (7-8pm) | 20 | 0 | 0 | 35 | 5 | 5 | On | Off | Off | 25 | 3 | 3 | 0 | 0 | 0 | | 21 | (8-9pm) | 20 | 0 | 0 | 35 | 5 | 5 | On | Off | Off | 22 | 3 | 3 | 0 | 0 | 0 | | 22 | (9-10pm) | 10 | 0 | 0 | 30 | 5 | 5 | On | Off | Off | 22 | 3 | 3 | 0 | 0 | 0 | | 23 | (10-11pm) | 0 | 0 | 0 | 5 | 5 | 5 | Off | Off | Off | 12 | 3 | 3 | 0 | 0 | 0 | | 24 | (11-12am) | 0 | 0 | 0 | 5 | 5 | 5 | Off | Off | Off | 9 | 3 | 3 | 0 | 0 | 0 | | | | | | | | | | | | | | | | | | | | Total/Day | 710 | 50 | 0 | 750/990 | 170 | 120 | 1500 | 500 | 0 | 691 | 80 | 84 | 285 | 0 | 0 | | | Total/Week | | 36.00 | hours | | 40.40/ 52.40 | hours | | 80.00 | hours | | 36.19 | hours | | 14.25 | hours | | | Total/Year | | 1877 | hours | | 2101/ 2732 | hours | | 4171 | hours | | 1887 | hours | | 743 | hours | |

| Wk | = Weekday | | --- | --- | | a | Schedules for occupancy, lighting, receptacle, HVAC system and service hot water are from ASHRAE Standard 90.1-1989 and addendums, except that 5 percent emergency lighting has been added for all off hours. Elevator schedules, except for restaurants, are from the U.S. Department of Energy Standard Evaluation Techniques except changed to 0 percent when occupancy is 0 percent. These values may be used only if actual schedules are not known. | | b | Lighting profiles are modified to reflect the requirement for occupancy sensors in Section C405.2. |

Table B103(10)

Warehouse Occupancya

| | Schedule forOccupancy | Schedule for Lightingb/ Receptacle | | Schedule for Service Hot Water | Schedule forElevator | | | | | | | | | | | | | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | | Hour of Day (time) | Percent of Maximum Load | Percent of Maximum Load | Schedule for HVAC System | Percent of Maximum Load | Percent of Maximum Load | | | | | | | | | | | | | | | Wk | Sat | Sun | Wk | Sat | Sun | Wk | Sat | Sun | Wk | Sat | Sun | Wk | Sat | Sun | | 1 | (12-1am) | 0 | 0 | 0 | 5 | 5 | 5 | Off | Off | Off | 2 | 2 | 2 | 0 | 0 | 0 | | 2 | (1-2am) | 0 | 0 | 0 | 5 | 5 | 5 | Off | Off | Off | 2 | 2 | 2 | 0 | 0 | 0 | | 3 | (2-3am) | 0 | 0 | 0 | 5 | 5 | 5 | Off | Off | Off | 2 | 2 | 2 | 0 | 0 | 0 | | 4 | (3-4am) | 0 | 0 | 0 | 5 | 5 | 5 | Off | Off | Off | 2 | 2 | 2 | 0 | 0 | 0 | | 5 | (4-5am) | 0 | 0 | 0 | 5 | 5 | 5 | Off | Off | Off | 5 | 2 | 2 | 0 | 0 | 0 | | 6 | (5-6am) | 0 | 0 | 0 | 5 | 5 | 5 | Off | Off | Off | 7 | 2 | 2 | 0 | 0 | 0 | | 7 | (6-7am) | 0 | 0 | 0 | 5 | 5 | 5 | Off | Off | Off | 7 | 2 | 2 | 0 | 0 | 0 | | 8 | (7-8am) | 15 | 0 | 0 | 25/40 | 5 | 5 | On | Off | Off | 10 | 2 | 2 | 0 | 0 | 0 | | 9 | (8-9am) | 70 | 20 | 0 | 45/70 | 8 | 5 | On | On | Off | 30 | 6 | 2 | 0 | 0 | 0 | | 10 | (9-10am) | 90 | 20 | 0 | 55/90 | 24 | 5 | On | On | Off | 36 | 12 | 2 | 0 | 0 | 0 | | 11 | (10-11am) | 90 | 20 | 0 | 55/90 | 24 | 5 | On | On | Off | 36 | 12 | 2 | 30 | 0 | 0 | | 12 | (11-12pm) | 90 | 20 | 0 | 55/90 | 24 | 5 | On | On | Off | 46 | 17 | 2 | 0 | 0 | 0 | | 13 | (12-1pm) | 50 | 10 | 0 | 50/80 | 5 | 5 | On | On | Off | 57 | 4 | 4 | 0 | 0 | 0 | | 14 | (1-2pm) | 85 | 10 | 0 | 55/90 | 5 | 5 | On | On | Off | 43 | 4 | 4 | 0 | 0 | 0 | | 15 | (2-3pm) | 85 | 10 | 0 | 55/90 | 5 | 5 | On | On | Off | 38 | 2 | 2 | 0 | 0 | 0 | | 16 | (3-4pm) | 85 | 10 | 0 | 55/90 | 5 | 5 | On | On | Off | 40 | 2 | 2 | 40 | 0 | 0 | | 17 | (4-5pm) | 20 | 0 | 0 | 55/90 | 5 | 5 | On | Off | Off | 30 | 2 | 2 | 0 | 0 | 0 | | 18 | (5-6pm) | 0 | 0 | 0 | 30 | 5 | 5 | Off | Off | Off | 18 | 2 | 2 | 0 | 0 | 0 | | 19 | (6-7pm) | 0 | 0 | 0 | 5 | 5 | 5 | Off | Off | Off | 3 | 2 | 2 | 0 | 0 | 0 | | 20 | (7-8pm) | 0 | 0 | 0 | 5 | 5 | 5 | Off | Off | Off | 3 | 2 | 2 | 0 | 0 | 0 | | 21 | (8-9pm) | 0 | 0 | 0 | 5 | 5 | 5 | Off | Off | Off | 3 | 2 | 2 | 0 | 0 | 0 | | 22 | (9-10pm) | 0 | 0 | 0 | 5 | 5 | 5 | Off | Off | Off | 3 | 2 | 2 | 0 | 0 | 0 | | 23 | (10-11pm) | 0 | 0 | 0 | 5 | 5 | 5 | Off | Off | Off | 3 | 2 | 2 | 0 | 0 | 0 | | 24 | (11-12am) | 0 | 0 | 0 | 5 | 5 | 5 | Off | Off | Off | 3 | 2 | 2 | 0 | 0 | 0 | | | | | | | | | | | | | | | | | | | | Total/Day | 680 | 120 | 0 | 600/915 | 180 | 120 | 1000 | 800 | 0 | 429 | 91 | 52 | 70 | 0 | 0 | | | Total/Week | | 35.20 | hours | | 33.00/ 48.75 | hours | | 58.00 | hours | | 22.88 | hours | | 3.50 | hours | | | Total/Year | | 1835 | hours | | 1716/ 2542 | hours | | 3024 | hours | | 1193 | hours | | 182 | hours | |

| Wk | = Weekday | | --- | --- | | a | Schedules for occupancy, lighting, receptacle, HVAC system and service hot water are from ASHRAE Standard 90.1-1989 and addendums, except that 5 percent emergency lighting has been added for all off hours. Elevator schedules, except for restaurants, are from the U.S. Department of Energy Standard Evaluation Techniques except changed to 0 percent when occupancy is 0 percent. These values may be used only if actual schedules are not known. | | b | Lighting profiles are modified to reflect the requirement for occupancy sensors in Section C405.2. |

History

• Statutory Authority: RCW 19.27A.020, 19.27A.025 and chapters 19.27 and 34.05 RCW. WSR 13-04-056, § 51-11C-71039, filed 2/1/13, effective 7/1/13.

Wash. Admin. Code § 51-11C-80000 Appendix C—Exterior design conditions.

As required by Sections C302.2 and R302.2, the heating or cooling outdoor design temperatures shall be selected from Table C-1.

History

• Statutory Authority: RCW 19.27A.020, 19.27A.025 and chapters 19.27 and 34.05 RCW. WSR 13-04-056, § 51-11C-80000, filed 2/1/13, effective 7/1/13.

Wash. Admin. Code § 51-11C-80100 Table C-1—Outdoor design temperatures for Washington.

Table C-1

Outdoor Design Temperatures

| | Outdoor Design Temp. Heating | Outdoor Design Temp. Cooling | | | | --- | --- | --- | --- | --- | | Location | (°F) | (°F) | | | | Aberdeen 20 NNE | 25 | | 83 | | | Anacortes | 24 | | 72 | | | Anatone | -4 | | 89 | | | Auburn | 25 | | 84 | | | Battleground | 19 | | 91 | | | Bellevue | 24 | | 83 | | | Bellingham 2 N | 19 | | 78 | | | Blaine | 17 | | 73 | | | Bremerton | 29 | | 83 | | | Burlington | 19 | | 77 | | | Chehalis | 21 | | 87 | | | Chelan | 10 | | 89 | | | Cheney | 4 | | 94 | | | Chesaw | -11 | | 81 | | | Clarkston | 10 | | 94 | | | Cle Elum | 1 | | 91 | | | Colfax 1 NW | 2 | | 94 | | | Colville AP | -2 | | 92 | | | Concrete | 19 | | 83 | | | Connell 4 NNW | 6 | | 100 | | | Cougar 5 E | 25 | | 93 | | | Dallesport AP | 14 | | 99 | | | Darrington RS | 13 | | 85 | | | Davenport | 5 | | 92 | | | Edmonds | 24 | | 82 | | | Ellensburg AP | 2 | | 90 | | | Elma | 24 | | 88 | | | Ephrata AP | 7 | | 97 | | | Everett Paine AFB | 21 | | 79 | | | Forks 1 E | 23 | | 81 | | | Glacier RS | 13 | | 82 | | | Glenoma (Kosmos) | 18 | | 89 | | | Goldendale | 7 | | 94 | | | Grays River Hatchery | 24 | | 86 | | | Greenwater | 1.4 | | 84 | | | Grotto | 21 | | 84 | | | Hoquiam AP | 26 | | 79 | | | Inchelium 2 NW | 0 | | 92 | | | John Day Dam | 19 | | 100 | | | Kent | 21 | | 85 | | | Kirkland | 17 | | 83 | | | La Grande | 23 | | 88 | | | Leavenworth | -3 | | 93 | | | Little Goose Dam | 22 | | 101 | | | Long Beach 3 NNE | 25 | | 77 | | | Longview | 24 | | 87 | | | Lower Granite Dam | 14 | | 98 | | | Lower Monument Dam | 18 | | 103 | | | Marysville | 23 | | 79 | | | Metaline Falls | -1 | | 89 | | | Methow 2 W | 1 | | 89 | | | Nespelem 2 S | -4 | | 93 | | | Newhalem | 19 | | 89 | | | Newport | -5 | | 92 | | | Northport | 2 | | 92 | | | Oak Harbor | 16 | | 74 | | | Odessa | 7 | | 100 | | | Olga 2 SE | 24 | | 71 | | | Olympia, AP | 17 | | 85 | | | Omak 2 NW | 3 | | 90 | | | Oroville | 5 | | 93 | | | Othello | 9 | | 98 | | | Packwood | 16 | | 90 | | | Plain | -3 | | 89 | | | Pleasant View | 16 | | 98 | | | Pomeroy | 3 | | 95 | | | Port Angeles | 28 | | 75 | | | Port Townsend | 25 | | 76 | | | Prosser | 12 | | 97 | | | Puyallup | 19 | | 86 | | | Quilcene 2 SW | 23 | | 83 | | | Quinault RS | 25 | | 84 | | | Rainier, Longmire | 15 | | 85 | | | Paradise RS | 8 | | 71 | | | Raymond | 28 | | 81 | | | Redmond | 17 | | 83 | | | Republic | -9 | | 87 | | | Richland | 11 | | 101 | | | Ritzville | 6 | | 99 | | | Satus Pass | 10 | | 90 | | | Seattle: Sea-Tac AP | 24 | | 83 | | | Sedro Woolley 1 E | 19 | | 78 | | | Sequim | 23 | | 78 | | | Shelton | 23 | | 85 | | | Smyrna | 8 | | 102 | | | Snohomish | 21 | | 81 | | | Snoqualmie Pass | 6 | | 80 | | | Spokane AP | 4 | | 92 | | | Spokane CO | 10 | | 96 | | | Stampede Pass | 7 | | 76 | | | Stehekin 3 NW | 12 | | 85 | | | Stevens Pass | 6 | | 77 | | | Tacoma CO | 29 | | 82 | | | Tatoosh Island | 31 | | 63 | | | Toledo AP | 17 | | 84 | | | Vancouver | 22 | | 88 | | | Vashon Island | 28 | | 78 | | | Walla Walla AP | 6 | | 96 | | | Waterville | 1 | | 88 | | | Wellpinit | 1 | | 93 | | | Wenatchee CO | 10 | | 92 | | | Whidbey Island | 11 | | 71 | | | Willapa Harbor | 26 | | 81 | | | Wilson Creek | 3 | | 96 | | | Winthrop 1 WSW | -12 | | 91 | | | Yakima AP | 11 | | 94 | |

ABBREVIATIONS:

AFB Air Force Base

AP Airport

CO City Office

RS Ranger Station

Typical: "4(miles)NE"

History

• Statutory Authority: RCW 19.27A.020, 19.27A.025 and chapters 19.27 and 34.05 RCW. WSR 13-04-056, § 51-11C-80100, filed 2/1/13, effective 7/1/13.

Wash. Admin. Code § 51-11C-80500 Appendix D—Calculation of HVAC total system performance ratio.

D101 Scope. This appendix establishes criteria for demonstrating compliance using the HVAC total system performance ratio (HVAC TSPR) for systems serving office (including medical offices), retail, library and education occupancies and buildings, which are subject to the requirements of Section C403.3.5 without exceptions, and dwelling units and common areas within multifamily buildings. Those HVAC systems shall comply with Section C403 and this appendix as required by Section C403.1.1.

D101.1 Core and Shell/Initial Build-Out, and Future System Construction Analysis.

Where the building permit applies to only a portion of the HVAC system in a building and the remaining components will be designed under a future building permit or were previously installed, the future or previously installed components shall be modeled as follows:

1. Where the HVAC zones that do not include HVAC systems in the current permit will be or are served by independent systems, then the block including those zones shall not be included in the model.

2. Where the HVAC zones that do not include complete HVAC systems in the permit are intended to receive HVAC services from systems in the permit, their proposed zonal systems shall be modeled with equipment that meets, but does not exceed, the requirements of Section C403.

3. Where the zone equipment in the permit receives HVAC services from previously installed systems that are not in the permit, the previously installed systems shall be modeled with equipment matching the certified value of what is installed or equipment that meets the requirements of Section C403.

4. Where the central plant heating and cooling equipment is completely replaced and HVAC zones with existing systems receive HVAC services from systems in the permit, their proposed zonal systems shall be modeled with equipment that meets, but does not exceed, the requirements of Section C403.

| Informative Notes: | 1. Examples of HVAC systems that are intended to receive HVAC services from systems in the permit include future zonal water source heat pumps that will receive loop water that is heated by a boiler or cooled by a cooling tower included in the permit, any system that will receive outdoor ventilation air from a dedicated outdoor air system included in the permit, and future zone terminal units that will be connected to a central VAV system included in the permit. | | --- | --- | | | 2. An initial build-out with heating coils served from a previously installed system with a high-efficiency condensing boiler would use the installed efficiency if it exceeded the current requirements. If the installed boiler had a lower efficiency than the current requirements, the current requirement would be used. | | | 3. A partial central plant upgrade (e.g., chiller, but not boiler replacement) cannot use this method. |

D201 Compliance. Compliance based on HVAC total system performance ratio requires that the provisions of Section C403.3 are met and the HVAC total system performance ratio of the proposed design is more than or equal to the HVAC total system performance ratio of the standard reference design. The HVAC TSPR is calculated according to the following formula:

HVAC TSPR = annual heating and cooling load/annual carbon emissions from energy consumption of the building HVAC systems

| Where: | | | | --- | --- | --- | | Annual carbon emissions from energy consumption of the building HVAC systems | = | sum of the annual carbon emissions in pounds for heating, cooling, fans, energy recovery, pumps, and heat rejection calculated by multiplying site energy consumption by the carbon emission factors from Table D201 | | Annual heating and cooling load | = | sum of the annual heating and cooling loads met by the building HVAC system in thousands of Btus. |

Table D201

Carbon Emissions Factors

| Type | CO2e (lb/unit) | Unit | | --- | --- | --- | | Electricity | 0.44 | kWh | | Natural gas | 11.70 | Therm | | Oil | 19.2 | Gallon | | Propane | 10.5 | Gallon | | Othera | 195.00 | mmBtu | | On-site renewable energyb | 0.00 | |

| a | District energy systems may use alternative emissions factors supported by calculations approved by the code official. | | --- | --- | | b | Not applicable to TSPR calculation in Appendix D. |

D300 Simulation program.

D301 General.

D302 Calculation of the HVAC TSPR for the Standard Reference Design. The simulation program shall calculate the HVAC TSPR based only on the input for the proposed design and the requirements of this appendix. The calculation procedure shall not allow the user to directly modify the building component characteristics of the standard reference design.

D303 Specific approval. Performance analysis tools meeting the applicable subsections of Appendix D and tested according to ASHRAE Standard 140 shall be permitted to be approved. Tools are permitted to be approved based on meeting a specified threshold for a jurisdiction. The code official shall be permitted to approve tools for a specified application or limited scope.

D400 Climatic data. The simulation program shall perform the simulation using hourly values of climatic data, such as temperature and humidity, using TMY3 data for the site as specified here: https://buildingenergyscore.energy.gov/resources

D500 Documentation. Documentation conforming to the provisions of this section shall be provided to the code official.

D501 Compliance report. Building permit submittals shall include:

1. A report produced by the simulation software that includes the following:

1.1 Address of the building.

1.2 Name of individual completing the compliance report.

1.3 Name and version of the compliance software tool.

1.4 The dimensions, floor heights and number of floors for each block.

1.5 By block, the U-factor, C-factor, or F-factor for each simulated opaque envelope component and the U-factor and SHGC for each fenestration component.

1.6 By block or by surface for each block, the fenestration area.

1.7 By block, a list of the HVAC equipment simulated in the proposed design including the equipment type, fuel type, equipment efficiencies and system controls.

1.8 Annual site HVAC energy use by end use for the proposed and baseline building.

1.9 Annual sum of heating and cooling loads for the baseline building.

1.10 The HVAC total system performance ratio for both the standard reference design and the proposed design.

2. A mapping of the actual building HVAC component characteristics and those simulated in the proposed design showing how individual pieces of HVAC equipment identified above have been combined into average inputs as required by Section D601.10 including:

2.1 Fans.

2.2 Hydronic pumps.

2.3 Air handlers.

2.4 Packaged cooling equipment.

2.5 Furnaces.

2.6 Heat pumps.

2.7 Boilers.

2.8 Chillers.

2.9 Cooling towers.

2.10 Electric resistance coils.

2.11 Condensing units.

2.12 Motors for fans and pumps.

2.13 Energy recovery devices.

For each piece of equipment identified above, include the following as applicable:

2.14 Equipment name or tag consistent with that found on the design documents.

2.15 Rated efficiency level.

2.16 Rated capacity.

2.17 Electrical input power for fans and pumps (before any speed or frequency control device) at design conditions and calculation of input value (W/cfm or W/gpm).

3. Floor plan of the building identifying how portions of the building are assigned to the simulated blocks and areas of the building that are not covered under the requirements of Section C403.1.1.

D600 Calculation procedure. Except as specified by this appendix, the standard reference design and proposed design shall be configured and analyzed using identical methods and techniques.

D601 Simulation of the proposed building design. The proposed design shall be configured and analyzed as specified in this section.

D601.1Block geometry. The geometry of buildings shall be configured using one or more blocks. Each block shall define attributes including block dimensions, number of floors, floor to floor height and floor to ceiling height. Simulation software may allow the use of simplified shapes (such as rectangle, L shape, H shape, U shape or T shape) to represent blocks. Where actual building shape does not match these predefined shapes, simplifications are permitted providing the following requirements are met:

1. The conditioned floor area and volume of each block shall match the proposed design within 10 percent.

2. The area of each exterior envelope component from Table C402.1.4 is accounted for within 10 percent of the actual design.

3. The area of vertical fenestration and skylights is accounted for within 10 percent of the actual design.

4. The orientation of each component in 2 and 3 above is accounted for within 45 degrees of the actual design.

The creation of additional blocks may be necessary to meet these requirements.

| EXCEPTION: | Portions of the building that are unconditioned or served by systems not covered by the requirements of Section C403.1.1 shall be omitted. | | --- | --- |

D601.1.1 Number of blocks. One or more blocks may be required per building based on the following restrictions:

1. Each block can have only one occupancy type (multifamily dwelling unit, multifamily common area, office, library, education or retail). Therefore, at least one single block shall be created for each unique use type.

2. Each block can be served by only one type of HVAC system. Therefore, a single block shall be created for each unique HVAC system and use type combination. Multiple HVAC units of the same type may be represented in one block. Section D601.10.2 provides directions for combining multiple HVAC units or components of the same type into a single block.

3. Each block can have a single definition of floor to floor or floor to ceiling heights. Where floor heights differ by more than 2 feet, unique blocks should be created for the floors with varying heights.

4. Each block can include either above grade or below grade floors. For buildings with both above grade and below grade floors, separate blocks should be created for each. For buildings with floors partially above grade and partially below grade, if the total wall area of the floor(s) in consideration is greater than or equal to 50 percent above grade, then it should be simulated as a completely above grade block, otherwise it should be simulated as a below grade block.

5. Each wall on a façade of a block shall have similar vertical fenestration. The product of the proposed designU-factor times the area of windows (UA) on each façade of a given floor cannot differ by more than 15 percent of the average UA for that façade in each block. The product of the proposed design SHGC times the area of windows (SHGCA) on each façade of a given floor cannot differ by more than 15 percent of the average SHGCA for that façade in each block. If either of these conditions are not met, additional blocks shall be created consisting of floors with similar fenestration.

6. For a building model with multiple blocks, the blocks should be configured together to have the same adjacencies as the actual building design.

D601.2 Thermal zoning. Each floor in a block shall be modeled as a single thermal zone or as five thermal zones consisting of four perimeter zones and a core zone. Below grade floors shall be modeled as a single thermal block. If any façade in the block is less than 45 feet in length, there shall only be a single thermal zone per floor. Otherwise each floor shall be modeled with 5 thermal zones. A perimeter zone shall be created extending from each façade to a depth of 15 feet. Where facades intersect, the zone boundary shall be formed by a 45 degree angle with the 2 facades. The remaining area or each floor shall be modeled as a core zone with no exterior walls.

D601.3 Occupancy.

D601.3.1 Occupancy type. The occupancy type for each block shall be consistent with the building area type as determined in accordance with Section C405.4.2.1. Portions of the building that are building area types other than multifamily dwelling unit, multifamily common area, office, school (education), library, or retail shall not be included in the simulation. Surfaces adjacent to such building portions shall be modeled as adiabatic in the simulation program.

D601.3.2 Occupancy schedule, density, and heat gain. The occupant density, heat gain, and schedule shall be for multifamily, office, retail, library, or school as specified by ASHRAE Standard 90.1 Normative Appendix C.

D601.4 Envelope components.

D601.4.1 Roofs. Roofs will be modeled with insulation above a steel roof deck. The roof U-factor and area shall be modeled as in the proposed design. If different roof thermal properties are present in a single block, an area weighted U-factor shall be used. Roof solar absorbtance shall be modeled at 0.70 and emittance at 0.90.

D601.4.2 Above grade walls. Walls will be modeled as steel frame construction. The U-factor and area of above grade walls shall be modeled as in the proposed design. If different wall constructions exist on the façade of a block an area-weighted U-factor shall be used.

D601.4.3 Below grade walls. The C-factor and area of below grade walls shall be modeled as in the proposed design. If different slab on grade floor constructions exist in a block, an area-weighted C-factor shall be used.

D601.4.4 Above grade exterior floors. Exterior floors shall be modeled as steel frame. The U-factor and area of floors shall be modeled as in the proposed design. If different wall constructions exist in the block an area-weighted U-factor shall be used.

D601.4.5 Slab on grade floors. The F-factor and area of slab on grade floors shall be modeled as in the proposed design. If different below grade wall constructions exist in a block, an area-weighted F-factor shall be used.

D601.4.6 Vertical fenestration. The window area and area weighted U-factor and SHGC shall be modeled for each façade based on the proposed design. Each exterior surface in a block must comply with Section D601.1.1 item 5. Windows will be combined in to a single window centered on each façade based on the area and sill height input by the user. When different U-factors, SHGC or sill heights exist on a single façade, area weighted average for each shall be input by the user.

D601.4.7 Skylights. The skylight area and area weighted U-factor and SHGC shall be modeled for each floor based the proposed design. Skylights will be combined in to a single skylight centered on the roof of each zone based on the area input by the user.

D601.4.8 Exterior shading. Permanent window overhangs shall be modeled. When windows with and without overhangs or windows with different overhang projection factors exist on a façade, window width weighted projection factors shall be input by the user as follows.

| Pavg | = | A1 × Lo1 + A2 × Lo2 … An × Lon | | --- | --- | --- | | Lw1 + Lw2 … Lwn | | |

| Where: | | | | | --- | --- | --- | --- | | | Pavg | = | Average overhang projection modeled in the simulation tool. | | | A | = | Distance measured horizontally from the furthest continuous extremity of any overhang, eave or permanently attached shading device to the vertical surface of the glazing. | | | Lo | = | Length off the overhang. | | | Lw | = | Length of the window. |

D601.5 Lighting. Interior lighting power density shall be equal to the allowance in Table C405.4.2(1) for multifamily, office, retail, library, or school. The lighting schedule shall be for multifamily, office, retail, library, or school as specified by ASHRAE Standard 90.1 Normative Appendix C. The impact of lighting controls is assumed to be captured by the lighting schedule and no explicit controls shall be modeled. Exterior lighting shall not be modeled.

D601.6 Miscellaneous equipment. The miscellaneous equipment schedule and power shall be for multifamily, office, retail, library, or school as specified by ASHRAE Standard 90.1 Normative Appendix C. The impact of miscellaneous equipment controls is assumed to be captured by the equipment schedule and no explicit controls shall be modeled.

| EXCEPTIONS: | 1. Multifamily dwelling units shall have a miscellaneous load density of 0.42 W/ft2. | | --- | --- | | | 2. Multifamily common areas shall have a miscellaneous load density of 0 W/ft2. |

D601.7 Elevators. Elevators shall not be modeled.

D601.8 Service water heating equipment. Service water heating shall not be modeled.

D601.9 On-site renewable energy systems. On-site renewable energy systems shall not be modeled.

D601.10 HVAC equipment. HVAC systems shall meet the requirements of Section C403.

D601.10.1 Supported HVAC systems. At a minimum, the HVAC systems shown in Table D601.10.1 shall be supported by the simulation program.

Table D601.10.1

Proposed Building HVAC Systems Supported by HVAC TSPR Simulation Software

| System No. | System Name | System Abbreviation | | --- | --- | --- | | 1 | Packaged Terminal Air Conditioner | PTAC | | 2 | Packaged Terminal Air Heat Pump | PTHP | | 3 | Packaged Single Zone Gas Furnace (includes split system) | PSZGF | | 4 | Packaged Single Zone Heat Pump (air to air only)(includes split system) | PSZHP | | 5 | Variable Refrigerant Flow (air cooled only) | VRF | | 6 | Four Pipe Fan Coil | FPFC | | 7 | Water Source Heat Pump | WSHP | | 8 | Ground Source Heat Pump | GSHP | | 9 | Packaged Variable Air Volume (dx cooling) | PVAV | | 10 | Variable Air Volume (hydronic cooling) | VAV | | 11 | Variable Air Volume with Fan Powered Terminal Units | VAVFPTU | | 12 | Dedicated Outdoor Air System (in conjunction with systems 1-8) | DOAS |

D601.10.2 Proposed building HVAC system simulation. The HVAC systems shall be modeled as in the proposed design with clarifications and simplifications as described in Table D601.10.2. System parameters not described in the following sections shall be simulated to meet the minimum requirements of Section C403. All zones within a block shall be served by the same HVAC system type as described in Section D601.1.1 item 2. Where multiple system components serve a block, average values weighed by the appropriate metric as described in this section shall be used. Heat loss from ducts and pipes shall not be modeled.

1. Where multiple fan systems serve a single block, fan power shall be based on weighted average using the design supply air cfm.

2. Where multiple cooling systems serve a single block, COP shall be based on a weighted average using cooling capacity. DX coils shall be entered as multi-stage if more than 50% of coil capacity serving the block is multi-stage with staged controls.

3. Where multiple heating systems serve a single block, thermal efficiency or heating COP shall be based on a weighted average using heating capacity.

4. Where multiple boilers or chillers serve a heating water or chilled water loop, efficiency shall be based on a weighted average for using heating or cooling capacity.

5. When multiple cooling towers serving a condenser water loop are combined, the cooling tower efficiency, cooling tower design approach and design range are based on a weighted average of the design water flow rate through each cooling tower.

6. Where multiple pumps serve a heating water, chilled water or condenser water loop, pump power shall be based on a weighted average for using design water flow rate.

7. When multiple system types with and without economizers are combined, the economizer maximum outside air fraction of the combined system shall be based on weighted average of 100% supply air for systems with economizers and design outdoor air for systems without economizers.

8. Multiple systems with and without ERVs cannot be combined.

9. Systems with and without supply air temperature reset cannot be combined.

10. Systems with different fan control (constant volume, multi-speed or VAV) for supply fans cannot be combined.

11. Demand Controlled Ventilation (DCV) shall be modeled using a simplified approach that adjusts the design outdoor supply air flow rate based on the area of the building that is covered by DCV.

Table D601.10.2

Proposed Building System Parameters

| Category | Parameter | Fixed or User Defined | Required | Applicable Systems | | --- | --- | --- | --- | --- | | HVAC System Type | System Type | User Defined | Selected from Table D601.10.1 | All | | System Sizing | Design Day Information | Fixed | 99.6 percent heating design and 1 percent dry-bulb and 1 percent wet-bulb cooling design | All | | Zone Coil Capacity | Fixed | Sizing factors used are 1.25 for heating equipment and 1.15 for cooling equipment | All | | | Supply Airflow | Fixed | Based on a supply-air-to-room-air temperature set-point difference of 20°F | 1-11 | | | Fixed | Equal to required outdoor air ventilation | 12 | | | | Outdoor Ventilation Air | Portion of Supply Air with Proposed Filter ≥ MERV 13 | User Defined | Percentage of supply air flow subject to higher filtration (Adjusts baseline fan power higher. Prorated) | All | | | Outdoor Ventilation Air Flow Rate | Fixed | As specified in ASHRAE Standard 90.1 Normative Appendix C, adjusted for proposed DCV control | All | | | Outdoor Ventilation Supply Air Flow Rate Adjustments | Fixed | Based on ASHRAE Standard 62.1 Section 6.2.4.3 system ventilation efficiency (EVS) is 0.75 | 9-11 | | | Fixed | System ventilation efficiency (EVS) is 1.0 | 1-8, 12 | | | | Fixed | Base is 1.0 zone air distribution effectiveness | All | | | System Operation | Space Temperature Setpoints | Fixed | As specified in ASHRAE Standard 90.1 Normative Appendix C, except multifamily which shall use 68°F heating and 76°F cooling setpoints | 1-11 | | Fan Operation - Occupied | User Defined | Runs continuously during occupied hours or cycled to meet load. Multispeed fans reduce airflow related to thermal loads | 1-11 | | | Fan Operation - Occupied | Fixed | Fan runs continuously during occupied hours | 12 | | | Fan Operation -Night Cycle | Fixed | Fan cycles on to meet setback temperatures | 1-11 | | | Packaged Equipment Efficiency | DX Cooling Efficiency | User Defined | Cooling COP without fan energy calculated in accordance with ASHRAE Standard 90.1 Section 11.5.2c.b | 1, 2, 3, 4, 5, 7, 8, 9, 11, 12 | | DX Coil Number of Stages | User Defined | Single state or multistage | 3, 4, 9, 10, 11, 12 | | | Heat Pump Efficiency | User Defined | Heating COP without fan energy calculated in accordance with ASHRAE Standard 90.1 Section 11.5.2c.c | 2, 4, 5, 7, 8 | | | Furnace Efficiency | User Defined | Furnace thermal efficiencyc | 3, 9, 11, 12 | | | Heat Pump Supplemental Heat | Control | Fixed | Supplemental electric heat locked out above 40°F. Runs in conjunction with compressor between 40°F and 0°F. | 2, 4 | | System Fan Power and Controls | Part-Load Fan Controls | User Defined | Constant volume or two speed | 1-8 | | Part-Load Fan Controlsa | User Defined | Constant volume or variable air volume | 12 | | | Part-Load Fan Controlsa | Fixed | Variable air volume. VFD with static pressure reset. | 9-11 | | | Design Fan Power (W/cfm) | User Defined | Input electric power for all fans is required to operate at fan system design conditions divided by the supply airflow rate. This is a "wire to air" value including all drive, motor efficiency and other losses. | All | | | Low-Speed Fan Power | User Defined | Low speed input electric power for all fans required to operate at low speed conditions divided by the low speed supply airflow rate. This is a "wire to air" value including all drive, motor efficiency and other losses. | 1-8 | | | Variable Air Volume Systems | Supply Air Temperature (SAT) Controls | User Defined | If not SAT reset, constant at 55°F. Options for reset based on outdoor air temperature (OAT) or warmest zone. If warmest zone, then the user can specify the minimum and maximum temperatures. If OAT reset, SAT is reset higher to 60°F at outdoor low of 50°F. SAT is 55°F at outdoor high of 70°F. | 9, 10, 11 | | Minimum Terminal Unit Airflow Percentage | User Defined | Average minimum terminal unit airflow percentage for block weighted by cfm | 9, 10, 11 | | | Terminal Unit Heating Source | User Defined | Electric or hydronic | 9, 10, 11 | | | Dual Set Point Minimum VAV Damper Position | User Defined | Heating maximum airflow fractions | 9, 10 | | | Fan Powered Terminal Unit (FPTU) Type | User Defined | Series or parallel FPTU | 11 | | | Parallel FPTU Fan | Fixed | Sized for 50 percent peak primary air at 0.35 W/cfm | 11 | | | Series FPTU Fan | Fixed | Sized for 50 percent peak primary air at 0.35 W/cfm | 11 | | | Economizer | Economizer Presence | User Defined | Yes or No | 3, 4, 9, 10, 11 | | Economizer Control Type | Fixed | Differential dry-bulb | 3, 4, 9, 10, 11 | | | Energy Recovery | Sensible Effectiveness | User Defined | Heat exchanger sensible effectiveness at design heating and cooling conditions | 3, 4, 9, 10, 11, 12 | | Latent Effectiveness | User Defined | Heat exchanger latent effectiveness at design heating and cooling conditions | 3, 4, 9, 10, 11, 12 | | | Economizer Bypass | User Defined | If ERV is bypassed during economizer conditions | 3, 4, 9, 10, 11, 12 | | | Bypass SAT Setpoint | User Defined | If bypass, target supply air temperature | 3, 4, 9, 10, 11, 12 | | | Fan Power Reduction during Bypass (W/cfm) | User Defined | If ERV system include bypass, static pressure setpoint and variable speed fan, fan power can be reduced during economizer conditions | 3, 4, 9, 10, 11, 12 | | | Demand Controlled Ventilation | DCV Application | User Defined | Percent of block floor area under DCV control | 3, 4, 9, 10, 11, 12 | | DOAS | DOAS Fan Power W/cfm | User Defined | Fan electrical input power in W/cfm of supply airflow | 12 | | DOAS Supplemental Heating and Cooling | User Defined | Heating source, cooling source | 12 | | | Minimum SAT Setpoint (Cooling) | User Defined | SAT setpoint if DOAS includes supplemental cooling | 12 | | | Minimum SAT Setpoint (Heating) | User Defined | SAT setpoint if DOAS includes supplemental heating | 12 | | | Heating Plant | Boiler Efficiency | User Defined | Boiler thermal efficiency | 1, 6, 7, 9, 10, 11, 12 | | Heating Water Loop Configurationa | User Defined | Constant flow primary only; variable flow primary only; constant flow primary-variable flow secondary; variable flow primary and secondary | 1, 6, 7, 9, 10, 11, 12 | | | Heating Water Primary Pump Power (W/gpm) | User Defined | Heating water primary pump input W/gpm heating water flow | 1, 6, 7, 9, 10, 11, 12 | | | Heating Water Secondary Pump Power (W/gpm) | User Defined | Heating water secondary pump input W/gpm heating water flow (if primary/secondary) | 1, 6, 7, 9, 10, 11, 12 | | | Heating Water Loop Temperature | User Defined | Heating water supply and return temperatures | 1, 6, 9, 10, 11, 12 | | | Heating Water Loop Supply Temperature Reset Included | User Defined | Yes/No | 1, 6, 9, 10, 11, 12 | | | Heating Water Loop Supply Reset Temperature | Fixed | Reset HWS by 27.3 percent of design delta-T (HWS - 70°F (21.1°C) space heating temperature set point) between 20°F (-6.7°C) and 50°F (10°C) OAT | 1, 6, 9, 10, 11, 12 | | | Boiler Type | Fixed | Noncondensing boiler where input thermal efficiency is less than 86 percent; condensing boiler otherwise | 1, 6, 7, 9, 10, 11, 12 | | | Chilled Water Plant | Chiller Compressor Type | User Defined | Screw/scroll, centrifugal or reciprocating | 6,10, 11, 12 | | Chiller Condenser Type | User Defined | Air cooled or water cooled | 6, 10, 11, 12 | | | Chiller Full Load Efficiency | User Defined | Chiller COP | 6, 10, 11, 12 | | | Chilled Water Loop Configurationa | User Defined | Variable flow primary only, constant flow primary - variable flow secondary, variable flow primary and secondary | 6, 10, 11, 12 | | | Chilled Water Primary Pump Power (W/gpm) | User Defined | Primary pump input W/gpm chilled water flow (if primary/secondary) | 6, 10, 11, 12 | | | Chilled Water Secondary Pump Power (W/gpm) | User Defined | Secondary pump input W/gpm chilled water flow | 6, 10, 11, 12 | | | Chilled Water Temperature Reset Included | User Defined | Yes/No | 6, 10, 11, 12 | | | Chilled Water Temperature Reset Schedule (if included) | Fixed | Outdoor air reset: CHW supply temperature of 44°F at 80°F outdoor air dry-bulb and above, CHW supply temperature of 54°F at 60°F outdoor air dry-bulb temperature and below, ramped linearly between | 6, 10, 11, 12 | | | Condenser Water Pump Power (W/gpm) | User Defined | Pump input W/gpm condenser water flow | 6, 7, 8, 10, 11, 12 | | | Condenser Water Pump Control | User Defined | Constant speed or variable speed | 6, 7, 8, 10, 11, 12 | | | Cooling Tower Efficiency | User Defined | gpm/hp tower fan | 6, 7, 10, 11, 12 | | | | Cooling Tower Fan Control | User Defined | Constant or variable speed | 6, 7, 10, 11, 12 | | Cooling Tower Approach and Range | User Defined | Design cooling tower approach and range temperature | 6, 7, 10, 11, 12 | | | Heat Pump Loop Flow Control | Loop Flow and Heat Pump Control Valve | Fixed | Two position valve with VFD on pump. Loop flow at 3 gpm/ton | 7, 8 | | Heat Pump Loop Temperature Control | | User Defined | Restrict to minimum 20°F and maximum 40°F temperature difference | 7 | | GLHP Well Field | | Fixed | Bore depth = 250 feet Bore length 200 feet/ton for greater of cooling or heating load Bore spacing = 15 feet Bore diameter = 5 inches 3/4 inch Polyethylene pipe Ground and grout conductivity = 4.8 Btu-in/h-ft2-°F | 8 |

| a | Part load fan power and pump power modified in accordance with Table D601.10.3. | | --- | --- |

Table D601.10.3

Fan and Pump Power Curve Coefficients

| Equation Term | Fan Power Coefficients | Pump Power Coefficients | | | --- | --- | --- | --- | | VSD + SP Reset | Ride Pump Curve | VSD + DP/Valve Reset | | | b | 0.0408 | 0 | 0 | | x | 0.088 | 3.2485 | 0.0205 | | x2 | -0.0729 | -4.7443 | 0.4101 | | x3 | 0.9437 | 2.5295 | 0.5753 |

D602 Simulation of the standard reference design. The standard reference design shall be configured and analyzed as specified in this section.

D602.1 Utility rates. Same as proposed.

D602.2 Blocks. Same as proposed.

D602.3 Thermal zoning. Same as proposed.

D602.4 Occupancy type, schedule, density, and heat gain. Same as proposed.

D602.5 Envelope components. Same as proposed.

D602.6 Lighting. Same as proposed.

D602.7 Miscellaneous equipment. Same as proposed.

D602.8 Elevators. Not modeled. Same as proposed.

D602.9 Service water heating equipment. Not modeled. Same as proposed.

D602.10 On-site renewable energy systems. Not modeled. Same as proposed.

D602.11 HVAC equipment. The standard reference design HVAC equipment consists of separate space conditioning systems and dedicated outside air systems as described in Table D602.11 for the appropriate building occupancies.

Table D602.11

Standard Reference Design HVAC Systems

| Parameter | Building Type | | | | | | --- | --- | --- | --- | --- | --- | | Large Officea | Small Office and Librariesa | Retail | School | Multifamily | | | System Type | Water-source Heat Pump | Packaged air-source Heat Pump | Packaged air-source Heat Pump | Packaged air-source Heat Pump | Packaged air-source Heat Pump | | Fan Controlb | Cycle on Load | Cycle on Load | Cycle on Load | Cycle on Load | Cycle on Load | | Space Condition Fan Power (W/cfm) Proposed < MERV 13 | 0.528 | 0.528 | 0.522 | 0.528 | 0.528 | | Space Condition Fan Power (W/cfm) Proposed ≥ MERV 13 | 0.634 | 0.634 | 0.634 | 0.634 | 0.634 | | Heating/Cooling Sizing Factorc | 1.25/1.15 | 1.25/1.15 | 1.25/1.15 | 1.25/1.15 | 1.25/1.15 | | Supplemental Heating Availability | NA | <40°F | <40°F | <40°F | <40°F | | Modeled cooling COP (Net of Fan) d | 4.46 | 3.83 | 4.25 | 3.83 | 3.83 | | Modeled heating COP (Net of Fan) d | 4.61 | 3.81 | 3.57 | 3.81 | 3.86 | | Cooling Source | DX (Heat Pump) | DX (Heat Pump) | DX (Heat Pump) | DX (Heat Pump) | DX (Heat Pump) | | Heat Source | Heat Pump | Heat Pump | Heat Pump | Heat Pump | Heat Pump | | Number of Stages of Cooling | Single | Single | Two | Single | Single | | OSA Economizere | No | No | Yes | Yes | Yes | | Occupied Ventilation Sourcef | DOAS | DOAS | DOAS | DOAS | DOAS | | DOAS Fan Power (W/cfm of Outside Air) | 0.819 | 0.819 | 0.730 | 0.742 | 0.780 | | DOAS Fan Power (W/cfm) Proposed ≥ MERV 13 | 1.042 | 1.042 | 0.928 | 0.944 | 0.944 | | DOAS Temperature Controlg, h | Bypass | Wild | Bypass | Bypass | Wild | | ERV Efficiency (Sensible Only) | 70 percent | 70 percent | 70 percent | 70 percent | 70 percent | | WSHP Loop Heat Rejection | Cooling Toweri | NA | NA | NA | NA | | WSHP Loop Heat Source | Gas Boiler j | NA | NA | NA | NA | | WSHP Loop Temperature Controlk | 50°F to 70°F | NA | NA | NA | NA | | WSHP Circulation Pump W/gpml | 16 | NA | NA | NA | NA | | WSHP Loop Pumping Controlm | HP Valves & Pump VSD | NA | NA | NA | NA |

a Offices less than 50,000 square feet use "Small Office" parameters; otherwise use "Large Office" parameters.

b Space conditioning system shall cycle on to meet heating and cooling setpoint schedules as specified in ASHRAE Standard 90.1 Normative Appendix C. One space conditioning system is modeled in each zone. Conditioning system fan operation is not necessary for ventilation delivery.

c The equipment capacities (i.e., system coil capacities) for the standard reference design building design shall be based on design day sizing runs and shall be oversized by 15 percent for cooling and 25 percent for heating.

d COPs shown are direct heating or cooling performance and do not include fan energy use. See ASHRAE 90.1 Appendix G (G3.1.2.1) for separation of fan from COP in packaged equipment for units where the efficiency rating includes fan energy (e.g., SEER, EER, HSPF, COP).

e Economizer on space conditioning systems shall be simulated when outdoor air conditions allow free cooling. Economizer high limit shall be based on differential dry-bulb control. DOAS system continues to operate during economizer mode.

f Airflow equal to the outside air ventilation requirements is supplied and exhausted through a separate DOAS system including a supply fan, exhaust fan and sensible only heat exchanger. No additional heating or cooling shall be provided by the DOAS. A single DOAS system will be provided for each block. The DOAS supply and return fans shall run whenever the HVAC system is scheduled to operate in accordance with ASHRAE 90.1 Normative Appendix C.

g "Wild" DOAS control indicates no active control of the supply air temperature leaving the DOAS system. Temperature will fluctuate based only on entering and leaving conditions and the effectiveness of ERV.

h "Bypass" DOAS control includes modulating dampers to bypass ERV with the intent to maintain supply air temperature at a maximum of 60°F when outside air is below 75°F. Once outside air is above 75°F, bypass dampers will be fully closed.

i Includes a single axial fan cooling tower with variable speed fans at 40.2 gpm/hp, sized for an approach of 10°F and a range of 10°F.

j Includes a single natural draft boiler with 80 percent Et.

k Loop boiler and heat rejection shall be controlled to maintain loop temperature entering heat pumps between 50°F and 70°F.

l Pump motor input power shall be 16 W/gpm.

m Loop flow shall be variable with variable speed drive pump and unit fluid flow shutoff at each heat pump when its compressor cycles off.

History

• Statutory Authority: RCW 19.27A.020, 19.27A.025, 19.27A.160, chapters 19.27A and 19.27 RCW. WSR 24-03-085, § 51-11C-80500, filed 1/16/24, effective 3/15/24
• WSR 22-14-091, 23-12-101, and 23-20-021, § 51-11C-80500, filed 7/1/22, 6/7/23, and 9/25/23, effective 3/15/24. Statutory Authority: RCW 19.27A.025, 19.27A.045 and chapter 19.27 RCW. WSR 20-21-080, § 51-11C-80500, filed 10/19/20, effective 2/1/21. Statutory Authority: RCW 19.27A.020, 19.27A.025, 19.27A.160 and chapter 19.27 RCW. WSR 19-24-040, § 51-11C-80500, filed 11/26/19, effective 7/1/20. Statutory Authority: RCW 19.27A.025, 19.27A.160, and 19.27.074. WSR 16-03-072, § 51-11C-80500, filed 1/19/16, effective 7/1/16.

Wash. Admin. Code § 51-11C-90000 Appendix E—Reserved.

History

• Statutory Authority: RCW 19.27A.020, 19.27A.025, 19.27A.160 and chapters 19.27A and 19.27 RCW. WSR 22-14-091, 23-12-101, and 23-20-021, § 51-11C-90000, filed 7/1/22, 6/7/23, and 9/25/23, effective 3/15/24. Statutory Authority: RCW 19.27A.020, 19.27A.025, 19.27A.160 and chapter 19.27 RCW. WSR 19-24-040, § 51-11C-90000, filed 11/26/19, effective 7/1/20.

Wash. Admin. Code § 51-11C-90500 Appendix F—Outcome-based energy budget.

Informational Note:The provisions contained in this appendix are not mandatory unless specifically referenced in the adopting ordinance.

F101.1 General. This section is an outcome-based energy budget compliance requirement pursuant to RCW 19.27A.160 to incrementally move toward achieving by 2031 a 70 percent reduction in annual net energy use compared with 2006 baseline. As an outcome-based energy budget, this requirement uses a building's actual energy use to determine compliance.

F101.2 Scope. Buildings permitted under this section shall document one year of net energy use below an energy budget within 3 years after occupancy and every 5 years thereafter. Buildings and sites shall also be designed with the ability to offset in the future all estimated energy needs through renewable energy generation with minimum 40 percent on-site, maximum 40 percent off-site, and maximum 20 percent through green power purchase. Buildings that exceed the energy budget by up to 20 percent shall offset the excess amount through a green power purchase agreement. Buildings that exceed the energy budget by more than 20 percent shall, using a posted performance bond or financial security, offset the excess amount over 20 percent by installing renewable energy or with an energy retrofit.

F101.3 Building permit submittal. Building designs shall establish on the Washington State Outcome-Based Energy Budget form (Figure F101.3):

1. The anticipated building energy use is lower than the energy budget.

2. The energy generation ability in the future is greater than or equal to the anticipated building energy use.

F101.3.1 Anticipated building energy use. The total yearly energy use from all metered fuel sources is the anticipated building energy use. Any energy used from district energy, combined heat and power, renewable energy, or captured waste heat systems must be metered. Buildings with any nonmetered energy sources are not permitted for compliance with this section. All secondary spaces and services (examples: Exterior building and site lighting, surface parking, garages, and exterior swimming pools) associated with the building shall be included in the overall energy use total. The anticipated site Energy Use Intensity (EUI) for each fuel source shall be reported in units of kWh/ft2/yr or kBtu/ft2/yr using the conversions listed below:

| Metered Fuel Source | to kWh: | to kBTU: | | --- | --- | --- | | Electric | kWh × 1 | kWh × 3.412 | | Gas | Therm × 29.308 | Therm × 100 | | Propane | Cubic Foot × 0.738 | Cubic Foot × 2.5185 | | Fuel Oil | Gallon × 43.872 | Gallon × 149.6905 |

F101.3.2 Building use and occupancy types. Building use and occupancy types permitted are indicated in Table F101.3.2(1).

F101.3.3 Maximum site energy budget. Table F101.3.2(1) indicates the site EUI budget for each building use and occupancy type along with the building enclosure requirements for all use and occupancy types.

F101.3.3.1 Mixed-use buildings. For buildings that contain more than one building use or occupancy type, the overall energy budget shall be based on the individual floor area percentage totals of each use times the individual energy budget and summing the results of all individual areas.

F101.3.3.2 Energy budget level options. Development teams may commit to a future, more stringent energy budget level from Table F101.3.2(1). Actual energy use and energy generation ability will be evaluated on this lower budget level.

F101.3.3.3 Energy modeling. A proposed building energy model is required for compliance with Section F101.3.2. A baseline energy model is not required. The proposed design model must show estimated energy use below the energy.

F101.3.4 Energy generation ability. Permit documents shall indicate the location, space allocated, and connection pathways for future installation of all potential energy generation systems. Only items defined by the Washington State Energy Code as on-site renewable energy shall be used to meet energy generation requirements.

F101.3.4.1 Energy generation categories. The development team shall complete the Washington State Outcome-Based Energy Budget form (Figure F101.3) to show the total renewable energy generation ability in the following categories:

1. Building integral: Renewable energy generation sources attached to the building. This value, combined with the on-site value, shall be at least 40 percent of the energy budget.

2. On-site: Renewable energy generation sources located on the building site property. This value, combined with the building integral value, shall be at least 40 percent of the energy budget.

3. Off-site: Renewable energy generation sources not located on the building site. This amount is limited to 40 percent of the energy budget. A specific off-site location does not need to be identified.

4. Green Power: Renewable energy purchased through the electric utility provider for the building. This amount is limited to 20 percent of the energy budget.

F101.3.4.2 Energy generation ability for building sites within a 2030 District. The development team for building sites within a designated 2030 District recognized by Architecture 2030 may use the Architecture 2030 Challenge 70 percent energy reduction target from the 2003 baseline as the energy budget. Building locations meeting this criteria and choosing this energy budget are exempt from the building integral and on-site requirements in Section F101.3.4.1. Green power remains capped at 20 percent. The generation requirements may be split, in any amount, among the building integral, on-site, or off-site categories. Actual energy use will be evaluated against the Architecture 2030 Challenge 70 percent energy reduction budget.

F101.4 Actual energy use submittal. The building owner or representative shall submit energy use documentation summary from all energy source providers or from an energy benchmarking service to the building code official. Code compliance is achieved with net energy use below the energy budget for any continuous 12-month span within the first 3 years of occupancy.

F101.4.1 Energy use monitoring period and occupancy. The energy use monitoring time frame shall start on the first full-month billing cycle of the utility or energy source provider(s) 6 months after a certificate of occupancy is issued. Buildings shall be deemed substantially occupied when a minimum 85 percent of the floor area, including all common areas, is occupied. The energy monitoring start time may be delayed up to an additional 6 months from certificate of occupancy (up to 12 months total) if 85 percent occupancy is not yet achieved. Buildings not 85 percent occupied after 12 months shall start the monitoring period for the portions occupied with an energy budget based on the spaces occupied and all common areas combined.

F101.4.2 Change of occupancy use during monitoring period. If an area within the building changes from one occupancy use to another with a different target EUI energy budget or if the building occupancy level drops below 50 percent, the target EUI energy budget shall be recalculated to become the new energy budget against which the building energy use shall be compared for compliance.

F101.4.3 Energy metering. All building spaces and uses subject to an energy budget or a portion of the energy budget shall be metered separately for all energy uses.

F101.4.4 Energy budget responsibility. The building owner is responsible for the compliance of the whole building. At the building owner's discretion, responsibility for the energy use budget may be divided and transferred into portions attributable to the occupant, operator or controller of each energy budget space. Common area spaces not under the control of an occupant or tenant may not be transferred.

F101.5 Actual energy use above the energy budget. Buildings exceeding the energy budget are not in compliance with the energy code and the building owner shall complete one of the following measures within 1 year:

1. Owners of buildings with actual energy use that exceeds the energy budget by up to 20 percent may offset the excess energy amount through annual green power purchase agreement from the utility provider at a rate of 1.1 times the excess energy amount until future code compliance is demonstrated.

2. Owners of buildings with actual energy use that exceeds the energy budget by more than 20 percent and up to 40 percent shall complete item 1 and either install on-building, on-site, or off-site energy generation equipment or invest in an energy conservation retrofit using the performance bond or financial security for energy amount remaining above 20 percent.

3. Owners of buildings with actual energy use that exceeds the energy budget by more than 40 percent shall complete item 1, item 2, and post a replacement performance bond or financial security equal to the first bond or security amount.

F101.5.1 Continued energy monitoring. Upon completing the necessary compliance measure(s) in Section F101.5 the building owner is provided another 3-year time frame to achieve and document net energy use below the energy budget for any continuous 12-month span. Owners of buildings that remain more than 20 percent above the energy budget shall repeat the measures in Section F101.5, up to 3 times maximum, using the performance bond or financial security to install energy generation equipment or to install an energy retrofit and post a new performance bond equal to the first.

F101.5.2 Tradable certificate for energy savings. As an alternate to the requirements of Section F101.5 a building owner may, when this market-based instrument becomes available, purchase a Tradable Certificate for Energy Savings (TCES) or "white certificates" from a building or entity with energy savings. The building owner shall purchase TCES's equal to 1.1 times the amount that the building's actual energy use exceeds the energy budget.

F101.6 Performance bond or financial security. A building developer must secure and submit to the code official a performance bond or an irrevocable financial security letter of credit from a state of Washington financial institution prior to certificate of occupancy issuance. The bond or security shall have a value equal to $4.00 per square foot of gross conditioned floor area. The bond or security shall be used only to install renewable energy on the building or for investment into energy conservation measures as part of an energy retrofit. The bond or security may also be held for one additional 3-year energy-monitoring period if green power is purchased. Upon demonstrated compliance with the energy budget, the bond or security requirement shall be released.

F101.6.1 Failure to submit energy use data. Building owners that fail to submit energy use data at the end of the 3-year monitoring period shall forfeit the full amount of the performance bond or financial security as payment to the local jurisdiction. Building owners that fail to submit energy use data at the end of each continuing five-year monitoring period shall be fined an amount equal to the original bond or financial security by the local jurisdiction.

F101.7 Continued energy budget certification. After achieving code compliance buildings shall be required every 5 years to document a continuous 12-month span with net energy use that is lower than the required energy budget. Owners of buildings with actual energy use that is at least 2.5 percent below their energy budget (from year permitted baseline, not voluntary year) may sell, when a future market-based instrument becomes available, their unused energy equivalents in the form of a "white certificate" or Tradable Certificate for Energy Savings.

F101.8 Local amendments. Local jurisdictions may amend the current code cycle EUI maximum energy budget by adopting a more stringent future code year value stated in Table F101.3.2(1).

Table F101.3.2(1)

Washington State Outcome-Based Energy Budget

| Building Occupancy/Use | Site EUI | | | | | | | | | | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | | | 2021 | 2024 | 2027 | 2030 | | | | | | | 4c | 5b | 4c | 5b | 4c | 5b | 4c | 5b | | | | B | Office - small | 19.48 | 20.60 | 16.79 | 17.74 | 14.09 | 14.87 | 11.40 | 12.00 | | | Office - medium | 22.22 | 24.47 | 18.91 | 20.81 | 15.61 | 17.16 | 12.30 | 13.50 | | | Office - large | 21.94 | 23.06 | 18.53 | 19.48 | 15.11 | 15.89 | 11.70 | 12.30 | | B | Health out-patient | 69.75 | 70.88 | 58.90 | 59.85 | 48.05 | 48.83 | 37.20 | 37.80 | | E | School - primary | 25.40 | 27.20 | 22.80 | 24.30 | 18.99 | 21.31 | 14.70 | 16.50 | | | School - secondary | 24.75 | 28.13 | 20.90 | 23.75 | 17.05 | 19.38 | 13.20 | 15.00 | | I-2 | Hospital | 76.60 | 72.00 | 68.70 | 64.50 | 56.19 | 57.10 | 43.50 | 49.70 | | M | Grocery | 98.90 | 98.40 | 88.70 | 88.20 | 75.56 | 78.00 | 58.50 | 62.70 | | M | Retail - stand alone | 30.00 | 34.50 | 26.60 | 30.40 | 23.20 | 26.30 | 19.80 | 22.20 | | | Retail - strip mall | 29.14 | 34.76 | 26.53 | 31.28 | 23.91 | 27.79 | 21.30 | 24.30 | | S-1 | Garage - encloseda | 7.00 | 7.00 | 5.90 | 5.90 | 4.90 | 4.90 | 3.90 | 3.90 | | | Garage - opena | 4.20 | 4.20 | 3.60 | 3.60 | 3.00 | 3.00 | 2.30 | 2.30 | | S-2 | Warehouse (nonref)b | 6.49 | 7.61 | 5.63 | 6.58 | 4.76 | 5.54 | 3.90 | 4.50 | | R-2 | kWh/person/year | 3,089 | 3,212 | 2,681 | 2,789 | 2,256 | 2,348 | 1,808 | 1,886 | | R-2 | Common kWh/sf/yr | 15.0 | 15.8 | 11.6 | 12.2 | 8.5 | 8.9 | 5.7 | 5.9 |

aLighting power allowance must still comply with Table C405.4.2(2).

bApplicable to heated warehouses only.

Table F101.3.2(2)

COMMERCIAL BUILDING TYPE DESCRIPTIONS

Commercial Building Prototype Descriptions Compared to CBSA Building Types

| Commercial Prototypes | CBSA Detailed Building Type Included | Other Criteria | | --- | --- | --- | | Small Office | office- admin, professional, government, financial; call center; city hall; retail banking; sales office; other office | Less than 20,000 square feet | | Medium Office | office- admin, professional, government, financial; call center; city hall; retail banking; sales office; other office | 20,001 - 100,000 square feet | | Large Office | office- admin, professional, government, financial; call center; city hall; retail banking; sales office; other office | Greater than 100,000 square feet | | Stand-alone Retail | auto parts; auto/boat dealer/show room; beauty/barber; car wash; clothing; department store; dry cleaner; electronics/appliances; florist, nursery; hardware; home improvement; laundromat (self-service); pharmacy; post office; rental center; repair shop; studio/gallery; vehicle repair; warehouse club; other specialty merchandise | Single stand-alone building | | Strip Mall | auto parts; auto/boat dealer/ show room; beauty/barber; car wash; clothing; department store; dry cleaner; electronics/appliances; florist, nursery; hardware; home improvement; laundromat (self-service); pharmacy; post office; rental center; repair shop; studio/gallery; vehicle repair; warehouse club; other specialty merchandise | Part of larger mixed-use building | | Supermarket | grocery | | | Primary School | elementary school; middle school; pre-school; other k-12 school | | | Secondary School | high school | | | Small Hotel | motel; bed & breakfast; boarding/rooming house, apt hotel | | | Large Hotel | hotel; hotel - resort | | | Hospital | hospital | | | Warehouse (non- refrigerated) | ministorage; warehouse, distribution; warehouse, storage; other warehouse | | | Quick Service Restaurant | cafeteria; catering service; coffee, doughnut, or bagel shop; fast food restaurant; ice cream or frozen yogurt shop; take-out restaurant; truck stop | | | Full-Service Restaurant | bar, pub, lounge; sit down restaurant; other restaurant | | | Outpatient Health care | dental office; medical clinic/outpatient medical; medical office; medical urgent care clinic; outpatient rehab; veterinarian office/clinic | | | Mid-rise Apartment | Not included in CBSA. Should represent all high rise (up to 4 stories) apartment buildings. | Census Data used to estimate number of apartments and square footage. Seattle Benchmarking Data used to estimate high rise to mid- rise split in urban area. | | High-rise Apartment | Not included in CBSA. Should represent all low rise (greater than 4 story) apartment buildings. | Census Data used to estimate number of apartments and square footage. Seattle Benchmarking Data used to estimate high rise to mid- rise split in urban area. | | Residential Care | assisted living; in-patient rehab; nursing home; retirement home; other residential care | |

FIGURE F101.3.2

Washington State Outcome-based Energy Budget Form

| WASHINGTON STATE OUTCOME-BASED ENERGY BUDGET FORM | (reserved for graphics) | | | | | | --- | --- | --- | --- | --- | --- | | | | | | | | | Building occupancy/use | | | | | | | | | | | | | | Conditioned floor area SF | | | | | | | | | | | | | | Code maximum site EUI energy budget | | | | | | | | | | | | | | Predicted EUI | | | | | | | | | | | | | | Electric | | | | | | | | | | | | | | Gas | | | | | | | | | | | | | | Propane | | | | | | | | | | | | | | Oil | | | | | | | | | | | | | | Other (source/generation) | | | | | | | | | | | | | | Generation Potential EUI | | | | | | | | | | | | | | Building Integral | | (combined must exceed 40%) | | | | | | | | | | | | On-site | | | | | | | | | | | | | | Off-site | | (max 40%) | | | | | | | | | | | | Purchase | | (max 40%) | | | | | | | | | | | | Percentage better than energy budget | | | | | | | | | | | | | | Percentage potential EUI above predicted EUI | | | | | | | | | | | | | | PROJECT SUMMARY | | | | | | | Building Name | | | | | | | Address | | | | | | | City | | | | | | | Owner | | | | | | | Address | | | | | | | City, State, Zip | | | | | | | PROJECT CERTIFICATION | | | | | | | Name | | | | | | | Firm | | | | | | | Date | | | | | (seal) |

History

• Statutory Authority: RCW 19.27A.020, 19.27A.025, 19.27A.160 and chapters 19.27A and 19.27 RCW. WSR 22-14-091, 23-12-101, and 23-20-021, § 51-11C-90500, filed 7/1/22, 6/7/23, and 9/25/23, effective 3/15/24. Statutory Authority: RCW 19.27A.020, 19.27A.025, 19.27A.160 and chapter 19.27 RCW. WSR 19-24-040, § 51-11C-90500, filed 11/26/19, effective 7/1/20.

Chapter 51-11R State Building Code adoption and amendment of the 2021 edition of the International Energy Conservation Code, Residential.

Wash. Admin. Code § 51-11R-10000 Chapter 1 RE—Scope and administration.

Reviser's note: The brackets and enclosed material in the text of the above section occurred in the copy filed by the agency.

Wash. Admin. Code § 51-11R-10100 Section R101—Scope and general requirements.

R101.1 Title. This code shall be known as the Washington State Energy Code-Residential, and shall be cited as such. It is referred to herein as "this code."

The 2021 edition of the Washington State Energy Code is hereby adopted. The Washington State Energy Code adopted under chapter 51-11R WAC shall become effective in all counties and cities of this state on March 15, 2024.

R101.2 Scope. This code applies to residential buildings and the buildings sites and associated systems and equipment. This code shall be the maximum and minimum energy code for residential construction in each town, city and county. Residential sleeping units, Group I-1, Condition 2 assisted living facilities licensed by Washington state under chapter 388-78A WAC and Group I-1, Condition 2 residential treatment facilities licensed by Washington state under chapter 246-337 WAC shall utilize the commercial building sections of the energy code regardless of the number of stories of height above grade plane.

R101.3 Intent. This code shall regulate the design and construction of buildings for the effective use and conservation of energy over the useful life of each building. This code is intended to provide flexibility to permit the use of innovative approaches and techniques to achieve this objective. This code is not intended to abridge safety, health or environmental requirements contained in other applicable codes or ordinances.

R101.4 Applicability. Where, in any specific case, different sections of this code specify different materials, methods of construction or other requirements, the most restrictive shall govern. Where there is a conflict between a general requirement and a specific requirement, the specific requirement shall govern.

R101.4.1 Mixed residential and commercial buildings. Where a building includes both residential building and commercial building portions, each portion shall be separately considered and meet the applicable provisions of the WSEC - Commercial or WSEC - Residential Provisions.

R101.5 Compliance.Residential buildings shall meet the provisions of WSEC - Residential Provisions. Commercial buildings shall meet the provisions of WSEC - Commercial Provisions.

R101.5.1 Compliance materials. The code official shall be permitted to approve specific computer software, worksheets, compliance manuals and other similar materials that meet the intent of this code.

History

• Statutory Authority: RCW 19.27A.020, 19.27A.045, 19.27A.160, and chapter 19.27A RCW. WSR 24-03-084, § 51-11R-10100, filed 1/16/24, effective 3/15/24
• WSR 23-02-060, 23-12-102, and 23-20-022, § 51-11R-10100, filed 1/3/23, 6/7/23, and 9/25/23, effective 3/15/24. Statutory Authority: RCW 19.27A.020, 19.27A.045, 19.27A.160 and chapter 19.27 RCW. WSR 20-01-047, § 51-11R-10100, filed 12/9/19, effective 7/1/20. Statutory Authority: RCW 19.27A.025, 19.27A.045, and chapters 19.27, 19.27A, and 34.05 RCW. WSR 17-17-160, § 51-11R-10100, filed 8/23/17, effective 10/1/17. Statutory Authority: RCW 19.27A.020, 19.27A.045, 19.27A.160, and 19.27.074. WSR 16-02-127, § 51-11R-10100, filed 1/6/16, effective 7/1/16. Statutory Authority: RCW 19.27A.020, 19.27A.045 and chapters 19.27 and 34.05 RCW. WSR 13-04-055, § 51-11R-10100, filed 2/1/13, effective 7/1/13.

Wash. Admin. Code § 51-11R-10200 Section R102—Alternative materials, design and methods of construction and equipment.

R102.1 General. The provisions of this code are not intended to prevent the installation of any material or to prohibit any design or method of construction not specifically prescribed by this code, provided that any such alternative has been approved. The code official shall have the authority to approve an alternative material, design or method of construction upon the written application of the owner or owner's authorized agent. The code official shall first find that the proposed design is satisfactory and complies with the intent of the provisions of this code, and that the material, method or work offered is, for the purpose intended, not less than the equivalent of that prescribed in this code for strength, effectiveness, fire resistance, durability, energy efficiency and safety. The code official shall respond in writing, stating the reason why the alternative was approved or was not approved.

History

• Statutory Authority: RCW 19.27A.020, 19.27A.045, 19.27A.160, and chapter 19.27A RCW. WSR 23-02-060, 23-12-102, and 23-20-022, § 51-11R-10200, filed 1/3/23, 6/7/23, and 9/25/23, effective 3/15/24. Statutory Authority: RCW 19.27A.020, 19.27A.045, 19.27A.160 and chapter 19.27 RCW. WSR 20-01-047, § 51-11R-10200, filed 12/9/19, effective 7/1/20. Statutory Authority: RCW 19.27A.020, 19.27A.045, 19.27A.160, and 19.27.074. WSR 16-02-127, § 51-11R-10200, filed 1/6/16, effective 7/1/16. Statutory Authority: RCW 19.27A.020, 19.27A.045 and chapters 19.27 and 34.05 RCW. WSR 13-04-055, § 51-11R-10200, filed 2/1/13, effective 7/1/13.

Wash. Admin. Code § 51-11R-10300 Section R103—Construction documents.

R103.1 General. Construction documents, technical report, and other supporting data shall be submitted in one or more sets, or in a digital format where allowed by the code official, with each application for a permit. The construction documents and technical reports shall be prepared by a registered design professional where required by the statutes of the jurisdiction in which the project is to be constructed. Where special conditions exist, the code official is authorized to require necessary construction documents to be prepared by a registered design professional.

| EXCEPTION: | The code official is authorized to waive the requirements for construction documents or other supporting data if the code official determines they are not necessary to confirm compliance with this code. | | --- | --- |

R103.2 Information on construction documents. Construction documents shall be drawn to scale upon suitable material. Electronic media documents are permitted to be submitted when approved by the code official. Construction documents shall be of sufficient clarity to indicate the location, nature and extent of the work proposed, and show in sufficient detail pertinent data and features of the building, systems and equipment as herein governed. Details shall include, but are not limited to, the following as applicable:

1. Energy compliance path per Section R401.2.

2. Insulation materials and their R-values.

3. Fenestration U-factors and SHGCs.

4. Area-weighted U-factor and SHGC calculations.

5. Mechanical system design criteria.

6. Mechanical and service water heating system and equipment types, sizes and efficiencies.

7. Equipment and systems controls.

8. Duct sealing, duct and pipe insulation and location.

9. Air sealing details.

R103.2.1 Building thermal envelope depiction. The building's thermal envelope shall be represented on the construction documents.

R103.3 Examination of documents. The code official shall examine or cause to be examined the accompanying construction documents and shall ascertain whether the construction indicated and described is in accordance with the requirements of this code and other pertinent laws or ordinances. The code official is authorized to utilize a registered design professional or other approved entity not affiliated with the building design or construction in conducting the review of the plans and specifications for compliance with the code.

R103.3.1 Approval of construction documents. When the code official issues a permit where construction documents are required, the construction documents shall be endorsed in writing and stamped "Reviewed for Code Compliance." Such approved construction documents shall not be changed, modified or altered without authorization from the code official. Work shall be done in accordance with the approved construction documents.

One set of construction documents so reviewed shall be retained by the code official. The other set shall be returned to the applicant, kept at the site of work and shall be open to inspection by the code official or a duly authorized representative.

R103.3.2 Previous approvals. This code shall not require changes in the construction documents, construction or designated occupancy of a structure for which a lawful permit has been heretofore issued or otherwise lawfully authorized, and the construction of which has been pursued in good faith within 180 days after the effective date of this code and has not been abandoned.

R103.3.3 Phased approval. The code official shall have the authority to issue a permit for the construction of part of an energy conservation system before the construction documents for the entire system have been submitted or approved, provided adequate information and detailed statements have been filed complying with all pertinent requirements of this code. The holders of such permit shall proceed at their own risk without assurance that the permit for the entire energy conservation system will be granted.

R103.4 Amended construction documents. Work shall be installed in accordance with the approved construction documents, and any changes made during construction that are not in compliance with the approved construction documents shall be resubmitted for approval as an amended set of construction documents.

R103.5 Retention of construction documents. One set of approved construction documents shall be retained by the code official for a period of not less than 180 days from date of completion of the permitted work, or as required by state or local laws.

History

• Statutory Authority: RCW 19.27A.020, 19.27A.045, 19.27A.160, and chapter 19.27A RCW. WSR 23-02-060, 23-12-102, and 23-20-022, § 51-11R-10300, filed 1/3/23, 6/7/23, and 9/25/23, effective 3/15/24. Statutory Authority: RCW 19.27A.020, 19.27A.045, 19.27A.160, and 19.27.074. WSR 16-02-127, § 51-11R-10300, filed 1/6/16, effective 7/1/16. Statutory Authority: RCW 19.27A.020, 19.27A.045 and chapters 19.27 and 34.05 RCW. WSR 13-04-055, § 51-11R-10300, filed 2/1/13, effective 7/1/13.

Wash. Admin. Code § 51-11R-10400 Section R104—Fees.

R104.1 Fees. A permit shall not be issued until the fees prescribed in Section R104.2 have been paid, nor shall an amendment to a permit be released until the additional fee, if any, has been paid.

R104.2 Schedule of permit fees. A fee for each permit shall be paid as required, in accordance with the schedule as established by the applicable governing authority.

R104.3 Work commencing before permit issuance. Any person who commences any work before obtaining the necessary permits shall be subject to an additional fee established by the code official, which shall be in addition to the required permit fees.

R104.4 Related fees. The payment of the fee for the construction, alteration, removal, or demolition of work done in connection to or concurrently with the work or activity authorized by a permit shall not relieve the applicant or holder of the permit from the payment of other fees that are prescribed by law.

R104.5 Refunds. The code official is authorized to establish a refund policy.

History

• Statutory Authority: RCW 19.27A.020, 19.27A.045, 19.27A.160, and chapter 19.27A RCW. WSR 24-03-084, § 51-11R-10400, filed 1/16/24, effective 3/15/24
• WSR 23-02-060, 23-12-102, and 23-20-022, § 51-11R-10400, filed 1/3/23, 6/7/23, and 9/25/23, effective 3/15/24. Statutory Authority: RCW 19.27A.045 and chapter 19.27A RCW. WSR 20-21-081, § 51-11R-10400, filed 10/19/20, effective 2/1/21. Statutory Authority: RCW 19.27A.020, 19.27A.045, 19.27A.160 and chapter 19.27 RCW. WSR 20-01-047, § 51-11R-10400, filed 12/9/19, effective 7/1/20. Statutory Authority: RCW 19.27A.025, 19.27A.045, 19.27A.160, and 19.27.074. WSR 17-10-063, § 51-11R-10400, filed 5/2/17, effective 6/2/17
• WSR 16-02-127, § 51-11R-10400, filed 1/6/16, effective 7/1/16. Statutory Authority: RCW 19.27A.020, 19.27A.045 and chapters 19.27 and 34.05 RCW. WSR 13-04-055, § 51-11R-10400, filed 2/1/13, effective 7/1/13.

Wash. Admin. Code § 51-11R-10500 Section R105—Inspections.

R105.1 General. Construction or work for which a permit is required shall be subject to inspection by the code official or his or her designated agent, and such construction or work shall remain visible and able to be accessed for inspection purposes until approved. It shall be the duty of the permit applicant to cause the work to remain visible and able to be accessed for inspection purposes. Neither the code official nor the jurisdiction shall be liable for expense entailed in the removal or replacement of any material, product, system or building component required to allow inspection to validate compliance with this code.

R105.2 Required inspections. The code official or his or her designated agent, upon notification, shall make the inspections set forth in Sections R105.2.1 through R105.2.5.

R105.2.1 Footing and foundation inspection. Inspections associated with footings and foundations shall verify compliance with the code as to R-value, location, thickness, depth of burial and protection of insulation as required by the code and approved plans and specifications.

R105.2.2 Framing and rough-in inspection. Inspections at framing and rough-in shall be made before application of interior finish and shall verify compliance with the code as to types of insulation and corresponding R-values and their correct location and proper installation; fenestration properties (U-factor and SHGC) and proper installation; and air leakage controls as required by the code and approved plans and specifications.

R105.2.2.1 Wall insulation inspection. The code official, upon notification, shall make a wall insulation inspection in addition to those inspections required in Section R109 of the International Residential Code. This inspection shall be made after all wall and cavity insulation is in place and prior to cover.

R105.2.3 Plumbing rough-in inspection. Inspections at plumbing rough-in shall verify compliance as required by the code and approved plans and specifications as to types of insulation and corresponding R-values and protection, and required controls.

R105.2.4 Mechanical rough-in inspection. Inspections at mechanical rough-in shall verify compliance as required by the code and approved plans and specifications as to installed HVAC equipment type and size, required controls, system insulation and corresponding R-value, system air leakage control, programmable thermostats, dampers, whole-house ventilation and minimum fan efficiency.

| EXCEPTION: | Systems serving multiple dwelling units shall be inspected in accordance with Section C104.2.4. | | --- | --- |

R105.2.5 Final inspection. The building shall have a final inspection and not be occupied until approved.

R105.3 Reinspection. A building shall be reinspected when determined necessary by the code official.

R105.4 Approved inspection agencies. The code official is authorized to accept reports of third-party inspection agencies not affiliated with the building design or construction, provided such agencies are approved as to qualifications and reliability relevant to the building components and systems they are inspecting.

R105.5 Inspection requests. It shall be the duty of the holder of the permit or their duly authorized agent to notify the code official when work is ready for inspection. It shall be the duty of the permit holder to provide access to and means for inspections of such work that are required by this code.

R105.6 Reinspection and testing. Where any work or installation does not pass an initial test or inspection, the necessary corrections shall be made so as to achieve compliance with this code. The work or installation shall then be resubmitted to the code official for inspection and testing.

History

• Statutory Authority: RCW 19.27A.020, 19.27A.045, 19.27A.160, and chapter 19.27A RCW. WSR 24-03-084, § 51-11R-10500, filed 1/16/24, effective 3/15/24
• WSR 23-02-060, 23-12-102, and 23-20-022, § 51-11R-10500, filed 1/3/23, 6/7/23, and 9/25/23, effective 3/15/24. Statutory Authority: RCW 19.27A.020, 19.27A.045 and chapters 19.27 and 34.05 RCW. WSR 13-04-055, § 51-11R-10500, filed 2/1/13, effective 7/1/13.

Wash. Admin. Code § 51-11R-10600 Section R106—Notice of approval.

R106.1 Approval. After the prescribed tests and inspections indicate that the work complies in all respects with this code, a notice of approval shall be issued by the code official.

R106.2 Revocation. The code official is authorized to, in writing, suspend or revoke a notice of approval issued under the provisions of this code wherever the certificate is issued in error, or on the basis of incorrect information supplied, or where it is determined that the building or structure, premise, or portion thereof is in violation of any ordinance or regulation or any of the provisions of this code.

History

• Statutory Authority: RCW 19.27A.020, 19.27A.045, 19.27A.160, and chapter 19.27A RCW. WSR 23-02-060, 23-12-102, and 23-20-022, § 51-11R-10600, filed 1/3/23, 6/7/23, and 9/25/23, effective 3/15/24. Statutory Authority: RCW 19.27A.020, 19.27A.045, 19.27A.160, and 19.27.074. WSR 16-02-127, § 51-11R-10600, filed 1/6/16, effective 7/1/16. Statutory Authority: RCW 19.27A.020, 19.27A.045 and chapters 19.27 and 34.05 RCW. WSR 13-04-055, § 51-11R-10600, filed 2/1/13, effective 7/1/13.

Wash. Admin. Code § 51-11R-10700 Section R107—Validity.

R107.1 General. If a portion of this code is held to be illegal or void, such a decision shall not affect the validity of the remainder of this code.

History

• Statutory Authority: RCW 19.27A.020, 19.27A.045, 19.27A.160, and chapter 19.27A RCW. WSR 23-02-060, 23-12-102, and 23-20-022, § 51-11R-10700, filed 1/3/23, 6/7/23, and 9/25/23, effective 3/15/24. Statutory Authority: RCW 19.27A.020, 19.27A.045 and chapters 19.27 and 34.05 RCW. WSR 13-04-055, § 51-11R-10700, filed 2/1/13, effective 7/1/13.

Wash. Admin. Code § 51-11R-10800 Section R108—Referenced standards.

R108.1 Referenced codes and standards. The codes and standards referenced in this code shall be those listed in Chapter 6, and such codes and standards shall be considered as part of the requirements of this code to the prescribed extent of each such reference and as further regulated in Sections R108.1.1 and R108.1.2.

R108.1.1 Conflicts. Where differences occur between provisions of this code and referenced codes and standards, the provisions of this code shall apply.

R108.1.2 Provisions in referenced codes and standards. Where the extent of the reference to a referenced code or standard includes subject matter that is within the scope of this code, the provisions of this code, as applicable, shall take precedence over the provisions in the referenced code or standard.

R108.2 Application of references. References to chapter or section numbers, or to provisions not specifically identified by number, shall be construed to refer to such chapter, section, or provision of this code.

R108.3 Other laws. The provisions of this code shall not be deemed to nullify any provisions of local, state, or federal law. In addition to the requirements of this code, all occupancies shall conform to the provisions included in the state building code (chapter 19.27 RCW). In case of conflicts among codes enumerated in RCW 19.27.031 (1) through (4) and this code, an earlier named code shall govern over those following. In the case of conflict between the duct sealing and insulation requirements of this code and the duct insulation requirements of Sections 603 and 604 of the International Mechanical Code, the duct insulation requirements of this code shall govern.

History

• Statutory Authority: RCW 19.27A.020, 19.27A.045, 19.27A.160, and chapter 19.27A RCW. WSR 24-03-084, § 51-11R-10800, filed 1/16/24, effective 3/15/24
• WSR 23-02-060, 23-12-102, and 23-20-022, § 51-11R-10800, filed 1/3/23, 6/7/23, and 9/25/23, effective 3/15/24. Statutory Authority: RCW 19.27A.020, 19.27A.045, 19.27A.160, and 19.27.074. WSR 16-02-127, § 51-11R-10800, filed 1/6/16, effective 7/1/16. Statutory Authority: RCW 19.27A.020, 19.27A.045 and chapters 19.27 and 34.05 RCW. WSR 13-04-055, § 51-11R-10800, filed 2/1/13, effective 7/1/13.

Wash. Admin. Code § 51-11R-10900 Section R109—Stop work order.

R109.1 Authority. Whenever the code official finds any work regulated by this code being performed in a manner either contrary to the provisions of this code or dangerous or unsafe, the code official is authorized to issue a stop work order.

R109.2 Issuance. The stop work order shall be in writing and shall be given to the owner of the property involved, or to the owner's authorized agent, or to the person doing the work. Upon issuance of a stop work order, the cited work shall immediately cease. The stop work order shall state the reason for the order, and the conditions under which the cited work will be permitted to resume.

R109.3 Emergencies. Where an emergency exists, the code official shall not be required to give a written notice prior to stopping the work.

R109.4 Failure to comply. Any person who shall continue any work after having been served with a stop work order, except such work as that person is directed to perform to remove a violation or unsafe condition, shall be subject to a fine as set by the applicable governing authority.

History

• Statutory Authority: RCW 19.27A.020, 19.27A.045, 19.27A.160, and chapter 19.27A RCW. WSR 23-02-060, 23-12-102, and 23-20-022, § 51-11R-10900, filed 1/3/23, 6/7/23, and 9/25/23, effective 3/15/24. Statutory Authority: RCW 19.27A.020, 19.27A.045 and chapters 19.27 and 34.05 RCW. WSR 13-04-055, § 51-11R-10900, filed 2/1/13, effective 7/1/13.

Wash. Admin. Code § 51-11R-11000 Section R110—Means of appeal.

R110.1 General. In order to hear and decide appeals of orders, decisions or determinations made by the code official relative to the application and interpretation of this code, there shall be and is hereby created a board of appeals. The code official shall be an ex officio member of said board but shall have no vote on any matter before the board. The board of appeals shall be appointed by the governing body and shall hold office at its pleasure. The board shall adopt rules of procedure for conducting its business, and shall render all decisions and findings in writing to the appellant with a duplicate copy to the code official.

R110.2 Limitations on authority. An application for appeal shall be based on a claim that the true intent of this code or the rules legally adopted thereunder have been incorrectly interpreted, the provisions of this code do not fully apply or an equally good or better form of construction is proposed. The board shall have no authority to waive requirements of this code.

R110.3 Qualifications. The board of appeals shall consist of members who are qualified by experience and training and are not employees of the jurisdiction.

R110.4 Administration. The code official shall take immediate action in accordance with the decision of the board.

History

• Statutory Authority: RCW 19.27A.020, 19.27A.045, 19.27A.160, and chapter 19.27A RCW. WSR 23-02-060, 23-12-102, and 23-20-022, § 51-11R-11000, filed 1/3/23, 6/7/23, and 9/25/23, effective 3/15/24. Statutory Authority: RCW 19.27A.020, 19.27A.045 and chapters 19.27 and 34.05 RCW. WSR 13-04-055, § 51-11R-11000, filed 2/1/13, effective 7/1/13.

Wash. Admin. Code § 51-11R-11100 Section R111—Violations.

It shall be unlawful for any person, firm, or corporation to erect or construct any building, or remodel or rehabilitate any existing building or structure in the state, or allow the same to be done, contrary to or in violation of any of the provisions of this code.

History

• Statutory Authority: RCW 19.27A.020, 19.27A.045, 19.27A.160, and chapter 19.27A RCW. WSR 23-02-060, 23-12-102, and 23-20-022, § 51-11R-11100, filed 1/3/23, 6/7/23, and 9/25/23, effective 3/15/24. Statutory Authority: RCW 19.27A.020, 19.27A.045 and chapters 19.27 and 34.05 RCW. WSR 13-04-055, § 51-11R-11100, filed 2/1/13, effective 7/1/13.

Wash. Admin. Code § 51-11R-11200 Section R112—Liability.

Nothing contained in this code is intended to be nor shall be construed to create or form the basis for any liability on the part of any city or county or its officers, employees, or agents for any injury or damage resulting from the failure of a building to conform to the provisions of this code.

History

• Statutory Authority: RCW 19.27A.020, 19.27A.045, 19.27A.160, and chapter 19.27A RCW. WSR 23-02-060, 23-12-102, and 23-20-022, § 51-11R-11200, filed 1/3/23, 6/7/23, and 9/25/23, effective 3/15/24.

Wash. Admin. Code § 51-11R-20000 Chapter 2 RE—Definitions.

Reviser's note: The brackets and enclosed material in the text of the above section occurred in the copy filed by the agency.

Wash. Admin. Code § 51-11R-20100 Section R201—General.

R201.1 Scope. Unless stated otherwise, the following words and terms in this code shall have the meanings indicated in this chapter.

R201.2 Interchangeability. Words used in the present tense include the future; words in the masculine gender include the feminine and neuter; the singular number includes the plural and the plural includes the singular.

R201.3 Terms defined in other codes. Terms that are not defined in this code but are defined in the International Building Code, International Fire Code, International Fuel Gas Code, International Mechanical Code, Uniform Plumbing Code or the International Residential Code shall have the meanings ascribed to them in those codes.

R201.4 Terms not defined. Terms not defined by this chapter shall have ordinarily accepted meanings such as the context implies.

History

• Statutory Authority: RCW 19.27A.020, 19.27A.045 and chapters 19.27 and 34.05 RCW. WSR 13-04-055, § 51-11R-20100, filed 2/1/13, effective 7/1/13.

Wash. Admin. Code § 51-11R-20200 Section R202—General definitions.

History

• Statutory Authority: RCW 19.27A.020, 19.27A.045 and chapters 19.27 and 34.05 RCW. WSR 13-04-055, § 51-11R-20200, filed 2/1/13, effective 7/1/13.

Wash. Admin. Code § 51-11R-20201 Section R202.1—A.

ABOVE-GRADE WALL. A wall enclosing conditioned space that is not a below-grade wall. This includes between-floor spandrels, peripheral edges of floors, roof and basement knee walls, dormer walls, gable end walls, walls enclosing a mansard roof and skylight shafts.

ACCESS (TO). That which enables a device, appliance, or equipment to be reached by ready access or by a means that first requires the removal or movement of a panel or similar obstruction.

ADDITION. An extension or increase in the conditioned space floor area, number of stories or height of a building or structure.

ADVANCED FRAMED WALLS. Studs framed on 24-inch centers with double top plate and single bottom plate. Corners use two studs or other means of fully insulating corners, and one stud is used to support each header. Headers consist of double 2x material with R-10 insulation between the header and exterior sheathing. Interior partition wall/exterior wall intersections are fully insulated in the exterior wall. (See Standard Framing and Appendix A of chapter 51-11C WAC.)

AIR BARRIER. One or more materials joined together in a continuous manner to restrict or prevent the passage of air through the building thermal envelope and its assemblies.

ALTERATION. Any construction, retrofit or renovation to an existing structure other than repair or addition. Also, a change in a building, electrical, gas, mechanical or plumbing system that involves an extension, addition or change to the arrangement, type or purpose of the original installation.

APPROVED. Acceptable to the code official.

APPROVED AGENCY. An established and recognized agency that is regularly engaged in conducting tests or furnishing inspection services, or furnishing product certification, where such agency has been approved by the code official.

AUTOMATIC. Self-acting, operating by its own mechanism when actuated by some impersonal influence, as, for example, a change in current strength, pressure, temperature or mechanical configuration (see "Manual").

History

• Statutory Authority: RCW 19.27A.020, 19.27A.045, 19.27A.160, and chapter 19.27A RCW. WSR 24-03-084, § 51-11R-20201, filed 1/16/24, effective 3/15/24
• WSR 23-02-060, 23-12-102, and 23-20-022, § 51-11R-20201, filed 1/3/23, 6/7/23, and 9/25/23, effective 3/15/24. Statutory Authority: RCW 19.27A.020, 19.27A.045, 19.27A.160 and chapter 19.27 RCW. WSR 20-01-047, § 51-11R-20201, filed 12/9/19, effective 7/1/20. Statutory Authority: RCW 19.27A.020, 19.27A.045, 19.27A.160, and 19.27.074. WSR 16-02-127, § 51-11R-20201, filed 1/6/16, effective 7/1/16. Statutory Authority: RCW 19.27A.020, 19.27A.045 and chapters 19.27 and 34.05 RCW. WSR 13-04-055, § 51-11R-20201, filed 2/1/13, effective 7/1/13.

Wash. Admin. Code § 51-11R-20202 Section R202.2—B.

BASEMENT WALL. See above-grade wall and below-grade wall.

BELOW-GRADE WALL. That portion of a wall in the building envelope that is entirely below the finish grade and in contact with the ground.

BUILDING. Any structure used or intended for supporting or sheltering any use or occupancy, including any mechanical systems, service water heating systems and electric power and lighting systems located on the building site and supporting the building.

BUILDING SITE. A contiguous area of land that is under the ownership or control of one entity.

BUILDING THERMAL ENVELOPE. The below-grade walls, above-grade walls, floors, ceilings, roofs, and any other building element assemblies that enclose conditioned space or provides a boundary between conditioned space and exempt or unconditioned space.

History

• Statutory Authority: RCW 19.27A.020, 19.27A.045, 19.27A.160 and chapter 19.27 RCW. WSR 20-01-047, § 51-11R-20202, filed 12/9/19, effective 7/1/20. Statutory Authority: RCW 19.27A.020, 19.27A.045 and chapters 19.27 and 34.05 RCW. WSR 13-04-055, § 51-11R-20202, filed 2/1/13, effective 7/1/13.

Wash. Admin. Code § 51-11R-20203 Section R202.3—C.

C-FACTOR (THERMAL CONDUCTANCE). The coefficient of heat transmission (surface to surface) through a building component or assembly, equal to the time rate of heat flow per unit area and the unit temperature difference between the warm side and cold side surfaces (Btu/h ft2 × °F) [W/(m2 × K)].

CAVITY INSULATION. Insulating material located between framing members.

CIRCULATING HOT WATER SYSTEM. A specifically designed water distribution system where one or more pumps are operated in the service hot water piping to circulate heated water from the water-heating equipment to the fixture supply and back to the water-heating equipment.

CLIMATE ZONE. A geographical region based on climatic criteria as specified in this code.

CODE OFFICIAL. The officer or other designated authority charged with the administration and enforcement of this code, or a duly authorized representative.

COMMERCIAL BUILDING. For this code, all buildings that are not included in the definition of "Residential buildings."

CONDITIONED FLOOR AREA. The horizontal projection of the floors associated with the conditioned space.

CONDITIONED SPACE. An area, room or space that is enclosed within the building thermal envelope and that is directly or indirectly heated or cooled. Spaces are indirectly heated or cooled where they communicate through openings with conditioned spaces, where they are separated from conditioned spaces by uninsulated walls, floors or ceilings, or where they contain uninsulated ducts, piping or other sources of heating or cooling.

CONNECTED THERMOSTAT. An internet enabled device that automatically adjusts heating and cooling temperature settings.

CONTINUOUS AIR BARRIER. A combination of materials and assemblies that restrict or prevent the passage of air through the building thermal envelope.

CONTINUOUS INSULATION (c.i.). Insulating material that is continuous across all structural members without thermal bridges other than fasteners and service openings. It is installed on the interior or exterior or is integral to any opaque surface of the building envelope.

CURTAIN WALL. Fenestration products used to create an external nonload-bearing wall that is designed to separate the exterior and interior environments.

Reviser's note: The brackets and enclosed material in the text of the above section occurred in the copy filed by the agency.

Wash. Admin. Code § 51-11R-20204 Section R202.4—D.

DEMAND RECIRCULATION WATER SYSTEM. A water distribution system where one or more pumps prime the service hot water piping with heated water upon demand for hot water.

DIMMER. A control device that is capable of continuously varying the light output and energy use of light sources.

DUCT. A tube or conduit utilized for conveying air. The air passages of self-contained systems are not to be construed as air ducts.

DUCT SYSTEM. A continuous passageway for the transmission of air that, in addition to ducts, includes duct fittings, dampers, plenums, fans and accessory air-handling equipment and appliances.

DUCTLESS MINI-SPLIT HEAT PUMP SYSTEM. A heating and cooling system that is comprised of one or multiple indoor evaporator/air-handling units and an outdoor condensing unit that is connected by refrigerant piping and electrical wiring. A ductless mini-split system is capable of cooling or heating one or more rooms without the use of a central ductwork system.

DWELLING UNIT. A single unit providing complete independent living facilities for one or more persons, including permanent provisions for living, sleeping, eating, cooking and sanitation.

DWELLING UNIT ENCLOSURE AREA. The sum of the area of ceiling, floors, and walls separating a dwelling unit's conditioned space from the exterior or from adjacent conditioned or unconditioned spaces. Wall height shall be measured from the finished floor of the dwelling unit to the underside of the floor above.

History

• Statutory Authority: RCW 19.27A.020, 19.27A.045, 19.27A.160, and chapter 19.27A RCW. WSR 23-02-060, 23-12-102, and 23-20-022, § 51-11R-20204, filed 1/3/23, 6/7/23, and 9/25/23, effective 3/15/24. Statutory Authority: RCW 19.27A.020, 19.27A.045, 19.27A.160 and chapter 19.27 RCW. WSR 20-01-047, § 51-11R-20204, filed 12/9/19, effective 7/1/20. Statutory Authority: RCW 19.27A.020, 19.27A.045 and chapters 19.27 and 34.05 RCW. WSR 13-04-055, § 51-11R-20204, filed 2/1/13, effective 7/1/13.

Wash. Admin. Code § 51-11R-20205 Section R202.5—E.

ENERGY ANALYSIS. A method for estimating the annual energy use of the proposed design and standard reference design based on estimates of energy use.

ENERGY COST. The total estimated annual cost for purchased energy for the building functions regulated by this code, including applicable demand charges.

ENERGY SIMULATION TOOL. An approved software program or calculation-based methodology that projects the annual energy use of a building.

EXTERIOR WALL. Walls including both above-grade walls and below-grade walls.

History

• Statutory Authority: RCW 19.27A.020, 19.27A.045, 19.27A.160, and 19.27.074. WSR 16-02-127, § 51-11R-20205, filed 1/6/16, effective 7/1/16. Statutory Authority: RCW 19.27A.020, 19.27A.045 and chapters 19.27 and 34.05 RCW. WSR 13-04-055, § 51-11R-20205, filed 2/1/13, effective 7/1/13.

Wash. Admin. Code § 51-11R-20206 Section R202.6—F.

FENESTRATION. Products classified as either vertical fenestration or skylights.

VERTICAL FENESTRATION. Windows (fixed or operable), glazed doors, glazed block and combination opaque/glazed doors composed of glass or other transparent or translucent glazing materials and installed at a slope of not less than 60 degrees from horizontal. Opaque areas such as spandrel panels are not considered vertical fenestration.

SKYLIGHT. Glass or other transparent or translucent glazing material installed with a slope of less than 60 degrees from horizontal, including unit skylights, tubular daylighting devices and glazing materials in solariums, sunrooms, roofs, and sloped walls.

FENESTRATION AREA. Total area of the fenestration measured using the rough opening, and including the glazing, sash and frame.

FENESTRATION PRODUCT, FIELD-FABRICATED. A fenestration product whose frame is made at the construction site of standard dimensional lumber or other materials that were not previously cut, or otherwise formed with the specific intention of being used to fabricate a fenestration product or exterior door. Field fabricated does not include site-built fenestration.

FENESTRATION PRODUCT, SITE-BUILT. A fenestration designed to be made up of field-glazed or field-assembled units using specific factory cut or otherwise factory-formed framing and glazing units. Examples of site-built fenestration include storefront systems, curtain walls, and atrium roof systems.

F-FACTOR. The perimeter heat loss factor for slab-on-grade floors (Btu/h × ft × °F) [W/(m × K)].

Reviser's note: The brackets and enclosed material in the text of the above section occurred in the copy filed by the agency.

Wash. Admin. Code § 51-11R-20207 Section R202.7—G.

History

• Statutory Authority: RCW 19.27A.020, 19.27A.045 and chapters 19.27 and 34.05 RCW. WSR 13-04-055, § 51-11R-20207, filed 2/1/13, effective 7/1/13.

Wash. Admin. Code § 51-11R-20208 Section R202.8—H.

HEATED SLAB-ON-GRADE FLOOR. Slab-on-grade floor construction in which the heating elements, hydronic tubing, or hot air distribution system is in contact with, or placed within or under, the slab.

HIGH-EFFICACYLIGHT SOURCES. Compact fluorescent lamps, light emitting diode (LED) lamps, T-8 or smaller diameter linear fluorescent lamps, or other lamps with an efficacy of not less than 65 lumens per watt, or luminaires with an efficacy of not less than 45 lumens per watt.

HISTORIC BUILDINGS. Buildings that are listed in or eligible for listing in the National Register of Historic Places, or designated as historic under an appropriate state or local law.

History

• Statutory Authority: RCW 19.27A.020, 19.27A.045, 19.27A.160, and chapter 19.27A RCW. WSR 23-02-060, 23-12-102, and 23-20-022, § 51-11R-20208, filed 1/3/23, 6/7/23, and 9/25/23, effective 3/15/24. Statutory Authority: RCW 19.27A.020, 19.27A.045, 19.27A.160 and chapter 19.27 RCW. WSR 20-01-047, § 51-11R-20208, filed 12/9/19, effective 7/1/20. Statutory Authority: RCW 19.27A.020, 19.27A.045, 19.27A.160, and 19.27.074. WSR 16-02-127, § 51-11R-20208, filed 1/6/16, effective 7/1/16. Statutory Authority: RCW 19.27A.020, 19.27A.045 and chapters 19.27 and 34.05 RCW. WSR 13-04-055, § 51-11R-20208, filed 2/1/13, effective 7/1/13.

Wash. Admin. Code § 51-11R-20209 Section R202.9—I.

INFILTRATION. The uncontrolled inward air leakage into a building caused by the pressure effects of wind or the effect of differences in the indoor and outdoor air density or both.

INSULATED SIDING. A type of continuous insulation with manufacturer-installed insulating material as an integral part of the cladding product having a minimum R-value of R-2.

INSULATING SHEATHING. An insulating board with a core material having a minimum R-value of R-2.

INTEGRATED ENERGY EFFICIENCY RATIO (IEER). A single-number figure of merit expressing cooling part-load EER efficiency for unitary air-conditioning and heat pump equipment on the basis of weighted operation at various load capacities for the equipment.

INTERMEDIATE FRAMED WALLS. Studs framed on 16-inch centers with double top plate and single bottom plate. Corners use two studs or other means of fully insulating corners, and each opening is framed by two studs. Headers shall be insulated to R-10.

History

• Statutory Authority: RCW 19.27A.020, 19.27A.045, 19.27A.160, and 19.27.074. WSR 16-02-127, § 51-11R-20209, filed 1/6/16, effective 7/1/16. Statutory Authority: RCW 19.27A.020, 19.27A.045 and chapters 19.27 and 34.05 RCW. WSR 13-04-055, § 51-11R-20209, filed 2/1/13, effective 7/1/13.

Wash. Admin. Code § 51-11R-20210 Section R202.10—J.

History

• Statutory Authority: RCW 19.27A.020, 19.27A.045 and chapters 19.27 and 34.05 RCW. WSR 13-04-055, § 51-11R-20210, filed 2/1/13, effective 7/1/13.

Wash. Admin. Code § 51-11R-20211 Section 202.11—K.

History

• Statutory Authority: RCW 19.27A.020, 19.27A.045 and chapters 19.27 and 34.05 RCW. WSR 13-04-055, § 51-11R-20211, filed 2/1/13, effective 7/1/13.

Wash. Admin. Code § 51-11R-20212 Section R202.12—L.

LABELED. Equipment, materials or products to which have been affixed a label, seal, symbol or other identifying mark of a nationally recognized testing laboratory, approved agency or other organization concerned with product evaluation that maintains periodic inspection of the production of the above-labeled items and whose labeling indicates either that the equipment, material or product meets identified standards or has been tested and found suitable for a specified purpose.

LISTED. Equipment, materials, products or services included in a list published by an organization acceptable to the code official and concerned with evaluation of products or services that maintains periodic inspection of production of listed equipment or materials or periodic evaluation of services and whose listing states either that the equipment, material, product or service meets identified standards or has been tested and found suitable for a specified purpose.

LOG STRUCTURE. A type of construction whose primary structural elements are formed by a system of logs.

LOG WALL. An assembly of individual structural logs for use as an exterior or interior load bearing wall, shear wall or nonload bearing wall.

LOW-VOLTAGE LIGHTING. A lighting system consisting of an isolating power supply, the low voltage luminaires, and associated equipment that are all identified for the use. The output circuits of the power supply operate at 30 volts (42.4 volts peak) or less under all load conditions.

History

• Statutory Authority: RCW 19.27A.020, 19.27A.045, 19.27A.160 and chapter 19.27 RCW. WSR 20-01-047, § 51-11R-20212, filed 12/9/19, effective 7/1/20. Statutory Authority: RCW 19.27A.020, 19.27A.045 and chapters 19.27 and 34.05 RCW. WSR 13-04-055, § 51-11R-20212, filed 2/1/13, effective 7/1/13.

Wash. Admin. Code § 51-11R-20213 Section R202.13—M.

manual. Capable of being operated by personal intervention (see "Automatic").

History

• Statutory Authority: RCW 19.27A.020, 19.27A.045 and chapters 19.27 and 34.05 RCW. WSR 13-04-055, § 51-11R-20213, filed 2/1/13, effective 7/1/13.

Wash. Admin. Code § 51-11R-20214 Section R202.14—N.

History

• Statutory Authority: RCW 19.27A.020, 19.27A.045 and chapters 19.27 and 34.05 RCW. WSR 13-04-055, § 51-11R-20214, filed 2/1/13, effective 7/1/13.

Wash. Admin. Code § 51-11R-20215 Section R202.15—O.

OCCUPANT SENSOR CONTROL. An automatic control device that detects the presence or absence of people within an area and causes lighting, equipment, or appliances to be regulated accordingly.

ON-SITE RENEWABLE ENERGY. Energy from renewable energy resources harvested at the building site.

OPAQUE DOOR. A door that is not less than 50 percent opaque in surface area.

History

• Statutory Authority: RCW 19.27A.020, 19.27A.045, 19.27A.160, and chapter 19.27A RCW. WSR 23-02-060, 23-12-102, and 23-20-022, § 51-11R-20215, filed 1/3/23, 6/7/23, and 9/25/23, effective 3/15/24. Statutory Authority: RCW 19.27A.045 and chapter 19.27A RCW. WSR 20-21-081, § 51-11R-20215, filed 10/19/20, effective 2/1/21. Statutory Authority: RCW 19.27A.020, 19.27A.045, 19.27A.160 and chapter 19.27 RCW. WSR 20-01-047, § 51-11R-20215, filed 12/9/19, effective 7/1/20. Statutory Authority: RCW 19.27A.020, 19.27A.045 and chapters 19.27 and 34.05 RCW. WSR 13-04-055, § 51-11R-20215, filed 2/1/13, effective 7/1/13.

Wash. Admin. Code § 51-11R-20216 Section R202.16—P.

PILOT LIGHT, CONTINUOUSLY BURNING. A small gas flame used to ignite gas at a larger burning. Once lit, a continuous pilot light remains in operation until manually interrupted. Pilot light ignition systems with the ability to switch between intermittent and continuous mode are considered continuous.

PILOT LIGHT, INTERMITTENT. A pilot which is automatically ignited when an appliance is called on to operate and which remains continuously ignited during each period of main burner operation. The pilot is automatically extinguished when each main burner operating cycle is completed.

PILOT LIGHT, INTERRUPTED. A pilot which is automatically ignited prior to the admission of fuel to the main burner and which is automatically extinguished after the main flame is established.

PILOT LIGHT, ON-DEMAND. A pilot which, once placed into operation, is intended to remain ignited for a predetermined period of time following an automatic or manual operation of the main burner gas valve.

PROPOSED DESIGN. A description of the proposed building used to estimate annual energy use for determining compliance based on total building performance.

History

• Statutory Authority: RCW 19.27A.045 and chapter 19.27A RCW. WSR 20-21-081, § 51-11R-20216, filed 10/19/20, effective 2/1/21. Statutory Authority: RCW 19.27A.020, 19.27A.045 and chapters 19.27 and 34.05 RCW. WSR 13-04-055, § 51-11R-20216, filed 2/1/13, effective 7/1/13.

Wash. Admin. Code § 51-11R-20217 Section R202.17—Q.

History

• Statutory Authority: RCW 19.27A.020, 19.27A.045 and chapters 19.27 and 34.05 RCW. WSR 13-04-055, § 51-11R-20217, filed 2/1/13, effective 7/1/13.

Wash. Admin. Code § 51-11R-20218 Section R202.18—R.

READY ACCESS (TO). That which enables a device, appliance, or equipment to be directly reached without requiring the removal or movement of any panel or similar obstruction.

RENEWABLE ENERGY CERTIFICATE (REC). An instrument that represents the environmental attributes of one megawatt hour of renewable energy; also known as an energy attribute certificate (EAC).

RENEWABLE ENERGY RESOURCES. Energy derived from solar radiation, wind, waves, tides, landfill gas, biogas, biomass, or extracted from hot fluid or steam heated within the earth.

REPAIR. The reconstruction or renewal of any part of an existing building for the purpose of its maintenance or to correct damage.

REROOFING. The process of recovering or replacing an existing roof covering. See "Roof recover" and "Roof replacement."

RESIDENTIAL BUILDING. For this code, the following building types are residential buildings:

1. Detached one- and two-family dwellings.

2. Multiple single-family dwellings (townhouses).

3. Group R-3 occupancy areas in buildings three stories or less in height above grade plane whose dwelling units are accessed directly from the exterior.

4. Group R-2 occupancy areas in buildings three stories or less in height above grade plane whose dwelling units are accessed directly from the exterior.

5. Accessory structures to residential buildings.

Group R-2 buildings with dwelling units accessed from interior corridors or other interior spaces are not residential buildings.

ROOF ASSEMBLY. A system designed to provide weather protection and resistance to design loads. The system consists of a roof covering and roof deck or a single component serving as both the roof covering and the roof deck. A roof assembly includes the roof covering, underlayment and roof deck, and can also include a thermal barrier, an ignition barrier, insulation or a vapor retarder.

ROOF RECOVER. The process of installing an additional roof covering over a prepared existing roof covering without removing the existing roof covering.

ROOF REPAIR. Reconstruction or renewal of any part of an existing roof for the purposes of its maintenance.

ROOF REPLACEMENT. The process of removing the existing roof covering, repairing any damaged substrate and installing a new roof covering.

R-VALUE (THERMAL RESISTANCE). The inverse of the time rate of heat flow through a body from one of its bounding surfaces to the other surface for a unit temperature difference between the two surfaces, under steady state conditions, per unit area (h • ft2 • °F/Btu) [(m2 • K)/W].

Reviser's note: The brackets and enclosed material in the text of the above section occurred in the copy filed by the agency.

Wash. Admin. Code § 51-11R-20219 Section R202.19—S.

SERVICE WATER HEATING. Supply of hot water for purposes other than comfort heating.

SLAB-ON-GRADE FLOOR. That portion of a slab floor of the building envelope that is in contact with the ground and that is either above grade or is less than or equal to 24 inches below the final elevation of the nearest exterior grade.

SMALL BUSINESS. Any business entity (including a sole proprietorship, corporation, partnership or other legal entity) which is owned and operated independently from all other businesses, which has the purpose of making a profit, and which has fifty or fewer employees.

SOLAR HEAT GAIN COEFFICIENT (SHGC). The ratio of the solar heat gain entering the space through the fenestration assembly to the incident solar radiation. Solar heat gain includes directly transmitted solar heat and absorbed solar radiation which is then reradiated, conducted or convected into the space.

STANDARD FRAMING. All framing practices not defined as "intermediate" or "advanced" shall be considered standard. (See Advanced Framed Wall, Intermediate Framed Wall).

STANDARD REFERENCE DESIGN. A version of the proposed design that meets the minimum requirements of this code and is used to determine the maximum annual energy use requirement for compliance based on total building performance.

History

• Statutory Authority: RCW 19.27A.025, 19.27A.045, 19.27A.160, and 19.27.074. WSR 17-10-063, § 51-11R-20219, filed 5/2/17, effective 6/2/17. Statutory Authority: RCW 19.27A.020, 19.27A.045 and chapters 19.27 and 34.05 RCW. WSR 13-04-055, § 51-11R-20219, filed 2/1/13, effective 7/1/13.

Wash. Admin. Code § 51-11R-20220 Section R202.20—T.

THERMAL DISTRIBUTION EFFICIENCY (TDE). The resistance to changes in air heat as air is conveyed through a distance of air duct. TDE is a heat loss calculation evaluating the difference in the heat of the air between the air duct inlet and outlet caused by differences in temperatures between the air in the duct and the duct material. TDE is expressed as a percent difference between the inlet and outlet heat in the duct.

THERMAL ISOLATION. Physical and space conditioning separation from conditioned space(s). The conditioned space(s) shall be controlled as separate zones for heating and cooling or conditioned by separate equipment.

THERMOSTAT. An automatic control device used to maintain temperature at a fixed or adjustable set point.

History

• Statutory Authority: RCW 19.27A.020, 19.27A.045, 19.27A.160, and chapter 19.27A RCW. WSR 23-02-060, 23-12-102, and 23-20-022, § 51-11R-20220, filed 1/3/23, 6/7/23, and 9/25/23, effective 3/15/24. Statutory Authority: RCW 19.27A.020, 19.27A.045 and chapters 19.27 and 34.05 RCW. WSR 13-04-055, § 51-11R-20220, filed 2/1/13, effective 7/1/13.

Wash. Admin. Code § 51-11R-20221 Section R202.21—U.

U-FACTOR (THERMAL TRANSMITTANCE). The coefficient of heat transmission (air to air) through a building component or assembly, equal to the time rate of heat flow per unit area and unit temperature difference between the warm side and cold side air films (Btu/h • ft2 • °F) [W/(m2 • K)].

UNHEATED SLAB-ON-GRADE FLOOR. A slab-on-grade floor that is not a heated slab-on-grade floor.

Reviser's note: The brackets and enclosed material in the text of the above section occurred in the copy filed by the agency.

Wash. Admin. Code § 51-11R-20222 Section R202.22—V.

VENTILATION. The natural or mechanical process of supplying conditioned or unconditioned air to, or removing such air from, any space.

VENTILATION AIR. That portion of supply air that comes from outside (outdoors) plus any recirculated air that has been treated to maintain the desired quality of air within a designated space.

VERTICAL FENESTRATION. All fenestration other than skylights.

VISIBLE TRANSMITTANCE [VT]. The ratio of visible light entering the space through the fenestration product assembly to the incident visible light, visible transmittance, includes the effects of glazing material and frame and is expressed as a number between 0 and 1.

Reviser's note: The brackets and enclosed material in the text of the above section occurred in the copy filed by the agency.

Wash. Admin. Code § 51-11R-20223 Section R202.23—W.

WHOLE HOUSE MECHANICAL VENTILATION SYSTEM. An exhaust system, supply system, or combination thereof that is designed to mechanically exchange indoor air with outdoor air when operating continuously or through a programmed intermittent schedule to satisfy the whole house ventilation rates.

History

• Statutory Authority: RCW 19.27A.020, 19.27A.045 and chapters 19.27 and 34.05 RCW. WSR 13-04-055, § 51-11R-20223, filed 2/1/13, effective 7/1/13.

Wash. Admin. Code § 51-11R-20224 Section R202.24—XYZ.

ZONE. A space or group of spaces within a building with heating or cooling requirements that are sufficiently similar so that desired conditions can be maintained throughout using a single controlling device.

History

• Statutory Authority: RCW 19.27A.020, 19.27A.045 and chapters 19.27 and 34.05 RCW. WSR 13-04-055, § 51-11R-20224, filed 2/1/13, effective 7/1/13.

Wash. Admin. Code § 51-11R-30000 Chapter 3 RE—General requirements.

Reviser's note: The brackets and enclosed material in the text of the above section occurred in the copy filed by the agency.

Wash. Admin. Code § 51-11R-30100 Section R301—Climate zones.

R301.1 General. Climate zones from Table R301.1 shall be used in determining the applicable requirements from Chapter 4. Locations not in Table R301.1 (outside the United States) shall be assigned a climate zone based on Section R301.3.

R301.2 Warm humid counties. Warm humid counties are identified in Table R301.1 by an asterisk.

R301.3 International climate zones. The climate zone for any location outside the United States shall be determined by applying Table R301.3(1) and then Table R301.3(2).

TABLE R301.1

CLIMATE ZONES, MOISTURE REGIMES, AND WARM-HUMID

DESIGNATIONS BY STATE AND COUNTY

| Key: A - Moist, B - Dry, C - Marine. Absence of moisture designation indicates moisture regime is irrelevant. Asterisk (*) indicates a warm-humid location. | | | | --- | --- | --- | | washington | | | | 5B Adams | 4C Grays Harbor | 4C Pierce | | 5B Asotin | 4C Island | 4C San Juan | | 5B Benton | 4C Jefferson | 4C Skagit | | 5B Chelan | 4C King | 5B Skamania | | 4C Clallam | 4C Kitsap | 4C Snohomish | | 4C Clark | 5B Kittitas | 5B Spokane | | 5B Columbia | 5B Klickitat | 5B Stevens | | 4C Cowlitz | 4C Lewis | 4C Thurston | | 5B Douglas | 5B Lincoln | 4C Wahkiakum | | 5B Ferry | 4C Mason | 5B Walla Walla | | 5B Franklin | 5B Okanogan | 4C Whatcom | | 5B Garfield | 4C Pacific | 5B Whitman | | 5B Grant | 5B Pend Oreille | 5B Yakima |

History

• Statutory Authority: RCW 19.27A.025, 19.27A.045, and 19.27.074. WSR 13-23-096, § 51-11R-30100, filed 11/20/13, effective 4/1/14. Statutory Authority: RCW 19.27A.020, 19.27A.045 and chapters 19.27 and 34.05 RCW. WSR 13-04-055, § 51-11R-30100, filed 2/1/13, effective 7/1/13.

Wash. Admin. Code § 51-11R-30200 Section R302—Design conditions.

R302.1 Interior design conditions. The interior design temperatures used for heating and cooling load calculations shall be a maximum of 72°F (22°C) for heating and minimum of 75°F (24°C) for cooling.

R302.2 Exterior design conditions. The heating or cooling outdoor design temperatures shall be selected from Appendix RC.

History

• Statutory Authority: RCW 19.27A.020, 19.27A.045, 19.27A.160, and chapter 19.27A RCW. WSR 24-03-084, § 51-11R-30200, filed 1/16/24, effective 3/15/24. Statutory Authority: RCW 19.27A.020, 19.27A.045 and chapters 19.27 and 34.05 RCW. WSR 13-04-055, § 51-11R-30200, filed 2/1/13, effective 7/1/13.

Wash. Admin. Code § 51-11R-30300 Section R303—Materials, systems and equipment.

History

• Statutory Authority: RCW 19.27A.020, 19.27A.045 and chapters 19.27 and 34.05 RCW. WSR 13-04-055, § 51-11R-30300, filed 2/1/13, effective 7/1/13.

Wash. Admin. Code § 51-11R-30310 Section R303.1—Identification.

R303.1 Identification. Materials, systems and equipment shall be identified in a manner that will allow a determination of compliance with the applicable provisions of this code.

R303.1.1 Building thermal envelope insulation. An R-value identification mark shall be applied by the manufacturer to each piece of building thermal envelope insulation 12 inches (305 mm) or greater in width. Alternately, the insulation installers shall provide a certification listing the type, manufacturer and R-value of insulation installed in each element of the building thermal envelope. For blown or sprayed insulation (fiberglass and cellulose), the initial installed thickness, settled thickness, settled R-value, installed density, coverage area and number of bags installed shall be listed on the certification. For sprayed polyurethane foam (SPF) insulation, the installed thickness of the areas covered and R-value of installed thickness shall be listed on the certification. For insulated siding, the R-value shall be labeled on the product's package and shall be listed on the certification. The insulation installer shall sign, date and post the certification in a conspicuous location on the job site.

| EXCEPTION: | For roof insulation installed above the deck, the R-value shall be labeled as required by the material standards specified in Table 1508.5 of the International Building Code or Table R906.2 of the International Residential Code. | | --- | --- |

R303.1.1.1 Blown or sprayed roof/ceiling insulation. The thickness of blown-in or sprayed roof/ceiling insulation (fiberglass or cellulose) shall be written in inches (mm) on markers that are installed at least one for every 300 square feet (28 m2) throughout the attic space. The markers shall be affixed to the trusses or joists and marked with the minimum initial installed thickness with numbers a minimum of 1 inch (25 mm) in height. Each marker shall face the attic access opening. Spray polyurethane foam thickness and installed R-value shall be listed on certification provided by the insulation installer.

R303.1.2 Insulation mark installation. Insulating materials shall be installed such that the manufacturer's R-value mark is readily observable upon inspection. For insulation materials that are installed without an observable manufacturer's R-value mark, such as blown or draped products, an insulation certificate complying with Section R303.1.1 shall be left immediately after installation by the installer, in a conspicuous location within the building, to certify the installed R-value of the insulation material.

R303.1.3 Fenestration product rating.U-factors of fenestration products (windows, doors and skylights) shall be determined in accordance with NFRC 100.

| EXCEPTION: | Where required, garage door U-factors shall be determined in accordance with either NFRC 100 or ANSI/DASMA 105. | | --- | --- |

U-factors shall be determined by an accredited, independent laboratory, and labeled and certified by the manufacturer.

Products lacking such a labeled U-factor shall be assigned a default U-factor from Table R303.1.3(1), R303.1.3(2) or R303.1.3(4). The solar heat gain coefficient (SHGC) and visible transmittance (VT) of glazed fenestration products (windows, glazed doors and skylights) shall be determined in accordance with NFRC 200 by an accredited, independent laboratory, and labeled and certified by the manufacturer. Products lacking such a labeled SHGC or VT shall be assigned a default SHGC or VT from Table R303.1.3(3).

| EXCEPTIONS: | 1. Units without NFRC ratings produced by a small business may be assigned default U-factors from Table R303.1.3(5) for vertical fenestration. | | --- | --- | | | 2. Owner-built, nonoperable wood frame window consisting of a double pane unit with low-e (E = 0.04 or less), 1/2-inch air space with argon fill. |

R303.1.4 Insulation product rating. The thermal resistance (R-value) of insulation shall be determined in accordance with the U.S. Federal Trade Commission R-value rule (C.F.R. Title 16, Part 460) in units of h × ft2 × °F/Btu at a mean temperature of 75°F (24°C).

R303.1.4.1 Insulated siding. The thermal resistance (R-value) of insulated siding shall be determined in accordance with ASTM C1363. Installation for testing shall be in accordance with the manufacturer's installation instructions.

R303.1.5 Air-impermeable insulation. Insulation having an air permeability not greater than 0.004 cubic feet per minute per square foot (0.002 L/(s x m2)) under pressure differential of 0.3-inch water gauge (75 Pa) when tested in accordance with ASTM E2178 shall be determined air-impermeable insulation.

History

• Statutory Authority: RCW 19.27A.020, 19.27A.045, 19.27A.160, and chapter 19.27A RCW. WSR 23-02-060, 23-12-102, and 23-20-022, § 51-11R-30310, filed 1/3/23, 6/7/23, and 9/25/23, effective 3/15/24. Statutory Authority: RCW 19.27A.045 and chapter 19.27A RCW. WSR 20-21-081, § 51-11R-30310, filed 10/19/20, effective 2/1/21. Statutory Authority: RCW 19.27A.020, 19.27A.045, 19.27A.160 and chapter 19.27 RCW. WSR 20-01-047, § 51-11R-30310, filed 12/9/19, effective 7/1/20. Statutory Authority: RCW 19.27A.020, 19.27A.045, 19.27A.160, and 19.27.074. WSR 16-02-127, § 51-11R-30310, filed 1/6/16, effective 7/1/16. Statutory Authority: RCW 19.27A.020, 19.27A.045 and chapters 19.27 and 34.05 RCW. WSR 13-04-055, § 51-11R-30310, filed 2/1/13, effective 7/1/13.

Wash. Admin. Code § 51-11R-30311 Table R303.1.3(1)—Default glazed fenestration U-factor.

TABLE R303.1.3(1)

DEFAULT GLAZED WINDOW, GLASS DOOR AND SKYLIGHT U-FACTOR

| FRAME TYPE | SINGLE PANE | DOUBLE PANE | | | --- | --- | --- | --- | | Metal | 1.20 | 0.80 | SKYLIGHT | | Metal with Thermal Breaka | 1.10 | 0.65 | See Table R303.1.3(4) | | Nonmetal or Metal Clad | 0.95 | 0.55 | | | Glazed Block | 0.60 | | |

| a | Metal Thermal Break = A metal thermal break framed window shall incorporate the following minimum design characteristics: | | --- | --- | | | 1) The thermal conductivity of the thermal break material shall be not more than 3.6 Btu-in/h/ft2/°F; | | | 2) The thermal break material must produce a gap in the frame material of not less than 0.210 inches; and | | | 3) All metal framing members of the products exposed to interior and exterior air shall incorporate a thermal break meeting the criteria in 1) and 2) above. |

History

• Statutory Authority: RCW 19.27A.045 and chapter 19.27A RCW. WSR 20-21-081, § 51-11R-30311, filed 10/19/20, effective 2/1/21. Statutory Authority: RCW 19.27A.020, 19.27A.045, 19.27A.160 and chapter 19.27 RCW. WSR 20-01-047, § 51-11R-30311, filed 12/9/19, effective 7/1/20. Statutory Authority: RCW 19.27A.020, 19.27A.045 and chapters 19.27 and 34.05 RCW. WSR 13-04-055, § 51-11R-30311, filed 2/1/13, effective 7/1/13.

Wash. Admin. Code § 51-11R-30312 Table R303.1.3(2)—Default opaque door U-factors.

TABLE R303.1.3(2)

DEFAULT OPAQUE DOOR U-FACTORS

| Door Type | No Glazed Fenestration | Single Glazing | Double Glazing with 1/4 in. Airspace | Double Glazing with 1/2 in. Airspace | Double Glazing with e = 0.10, 1/2 in. Argon | | | --- | --- | --- | --- | --- | --- | --- | | SWINGING DOORS (Rough opening - 38 in. x 82 in.) | | | | | | | | Slab Doors | | | | | | | | Wood slab in wood framea | 0.46 | | | | | | | | 6% glazed fenestration (22 in. x 8 in. lite) | - | 0.48 | 0.47 | 0.46 | 0.44 | | | 25% glazed fenestration (22 in. x 36 in. lite) | - | 0.58 | 0.48 | 0.46 | 0.42 | | | 45% glazed fenestration (22 in. x 64 in. lite) | - | 0.69 | 0.49 | 0.46 | 0.39 | | | More than 50% glazed fenestration | Use Table R303.1.3(1) | | | | | | Insulated steel slab with wood edge in wood framea | 0.16 | | | | | | | | 6% glazed fenestration (22 in. x 8 in. lite) | - | 0.21 | 0.20 | 0.19 | 0.18 | | | 25% glazed fenestration (22 in. x 36 in. lite) | - | 0.39 | 0.28 | 0.26 | 0.23 | | | 45% glazed fenestration (22 in. x 64 in. lite) | - | 0.58 | 0.38 | 0.35 | 0.26 | | | More than 50% glazed fenestration | Use Table R303.1.3(1) | | | | | | Foam insulated steel slab with metal edge in steel frameb | 0.37 | | | | | | | | 6% glazed fenestration (22 in. x 8 in. lite) | - | 0.44 | 0.42 | 0.41 | 0.39 | | | 25% glazed fenestration (22 in. x 36 in. lite) | - | 0.55 | 0.50 | 0.48 | 0.44 | | | 45% glazed fenestration (22 in. x 64 in. lite) | - | 0.71 | 0.59 | 0.56 | 0.48 | | | More than 50% glazed fenestration | Use Table R303.1.3(1) | | | | | | Cardboard honeycomb slab with metal edge in steel frameb | 0.61 | | | | | | | Style and Rail Doors | | | | | | | | Sliding glass doors/French doors | Use Table R303.1.3(1) | | | | | | | Site-Assembled Style and Rail Doors | | | | | | | | Aluminum in aluminum frame | - | 1.32 | 0.99 | 0.93 | 0.79 | | | Aluminum in aluminum frame with thermal break | - | 1.13 | 0.80 | 0.74 | 0.63 | |

| Note: | Appendix A Tables A107.1(2) through A107.1(4) of chapter 51-11C WAC may also be used if applicable. | | | --- | --- | --- | | | a | Thermally broken sill (add 0.03 for nonthermally broken sill). | | | b | Nonthermally broken sill. |

History

• Statutory Authority: RCW 19.27A.020, 19.27A.045, 19.27A.160, and chapter 19.27A RCW. WSR 24-03-084, § 51-11R-30312, filed 1/16/24, effective 3/15/24. Statutory Authority: RCW 19.27A.020, 19.27A.045, 19.27A.160 and chapter 19.27 RCW. WSR 20-01-047, § 51-11R-30312, filed 12/9/19, effective 7/1/20. Statutory Authority: RCW 19.27A.025, 19.27A.045, 19.27.020, and 19.27.074. WSR 14-24-123, § 51-11R-30312, filed 12/3/14, effective 1/3/15. Statutory Authority: RCW 19.27A.020, 19.27A.045 and chapters 19.27 and 34.05 RCW. WSR 13-04-055, § 51-11R-30312, filed 2/1/13, effective 7/1/13.

Wash. Admin. Code § 51-11R-30313 Table R303.1.3(3)—Default glazed fenestration SHGC and VT.

TABLE R303.1.3(3)

DEFAULT GLAZED FENESTRATION SHGC AND VT

| | SINGLE GLAZED | DOUBLE GLAZED | GLAZED BLOCK | | | | --- | --- | --- | --- | --- | --- | | | Clear | Tinted | Clear | Tinted | | | SHGC | 0.8 | 0.7 | 0.7 | 0.6 | 0.6 | | VT | 0.6 | 0.3 | 0.6 | 0.3 | 0.6 |

History

• Statutory Authority: RCW 19.27A.020, 19.27A.045 and chapters 19.27 and 34.05 RCW. WSR 13-04-055, § 51-11R-30313, filed 2/1/13, effective 7/1/13.

Wash. Admin. Code § 51-11R-30314 Table R303.1.3(4)—Default U-factors for skylights.

TABLE R303.1.3(4)

DEFAULT U-FACTORS FOR SKYLIGHTS

| | Frame Type | | | | | | --- | --- | --- | --- | --- | --- | | | Aluminum Without Thermal Break | Aluminum With Thermal Break | Reinforced Vinyl/Aluminum-Clad Wood or Vinyl | Wood or Vinyl-Clad Wood/Vinyl Without Reinforcing | | | Fenestration Type | | | | | | | Single Glazing | | | | | | | | glass | U-1.58 | U-1.51 | U-1.40 | U-1.18 | | | acrylic/polycarb | U-1.52 | U-1.45 | U-1.34 | U-1.11 | | Double Glazing | | | | | | | | air | U-1.05 | U-0.89 | U-0.84 | U-0.67 | | | argon | U-1.02 | U-0.86 | U-0.80 | U-0.64 | | Double Glazing, e = 0.20 | | | | | | | | air | U-0.96 | U-0.80 | U-0.75 | U-0.59 | | | argon | U-0.91 | U-0.75 | U-0.70 | U-0.54 | | Double Glazing, e = 0.10 | | | | | | | | air | U-0.94 | U-0.79 | U-0.74 | U-0.58 | | | argon | U-0.89 | U-0.73 | U-0.68 | U-0.52 | | Double Glazing, e = 0.05 | | | | | | | | air | U-0.93 | U-0.78 | U-0.73 | U-0.56 | | | argon | U-0.87 | U-0.71 | U-0.66 | U-0.50 | | Triple Glazing | | | | | | | | air | U-0.90 | U-0.70 | U-0.67 | U-0.51 | | | argon | U-0.87 | U-0.69 | U-0.64 | U-0.48 | | Triple Glazing, e = 0.20 | | | | | | | | air | U-0.86 | U-0.68 | U-0.63 | U-0.47 | | | argon | U-0.82 | U-0.63 | U-0.59 | U-0.43 | | Triple Glazing, e = 0.20 on 2 surfaces | | | | | | | | air | U-0.82 | U-0.64 | U-0.60 | U-0.44 | | | argon | U-0.79 | U-0.60 | U-0.56 | U-0.40 | | Triple Glazing, e = 0.10 on 2 surfaces | | | | | | | | air | U-0.81 | U-0.62 | U-0.58 | U-0.42 | | | argon | U-0.77 | U-0.58 | U-0.54 | U-0.38 | | Quadruple Glazing, e = 0.10 on 2 surfaces | | | | | | | | air | U-0.78 | U-0.59 | U-0.55 | U-0.39 | | | argon | U-0.74 | U-0.56 | U-0.52 | U-0.36 | | | krypton | U-0.70 | U-0.52 | U-0.48 | U-0.32 |

| Notes for Table R303.1.3(4) | | | --- | --- | | 1. | U-factors are applicable to glass and plastic, flat and domed units, all spacers and gaps. | | 2. | Emissivities shall be less than or equal to the value specified. | | 3. | Gap fill shall be assumed to be air unless there is a minimum of 90% argon or krypton. | | 4. | Aluminum frame with thermal break is as defined in footnote 1 to Table R303.1.3(1). |

History

• Statutory Authority: RCW 19.27A.045 and chapter 19.27A RCW. WSR 20-21-081, § 51-11R-30314, filed 10/19/20, effective 2/1/21. Statutory Authority: RCW 19.27A.020, 19.27A.045 and chapters 19.27 and 34.05 RCW. WSR 13-04-055, § 51-11R-30314, filed 2/1/13, effective 7/1/13.

Wash. Admin. Code § 51-11R-30315 Table R303.1.3(5)—Small business compliance default table.

TABLE R303.1.3(5)

SMALL BUSINESS COMPLIANCE TABLE

DEFAULT U-FACTORS FOR VERTICAL FENESTRATION

| Vertical Fenestration Description | Frame Type | | | | | | | --- | --- | --- | --- | --- | --- | --- | | Any Frame | Aluminum Thermal Break2 | Wood/Vinyl/ Fiberglass | | | | | | Panes | Low-e1 | Spacer | Fill | | | | | Double3 | A | Any | Argon | 0.48 | 0.41 | 0.32 | | | B | Any | Argon | 0.46 | 0.39 | 0.30 | | | C | Any | Argon | 0.44 | 0.37 | 0.28 | | | C | High Performance | Argon | 0.42 | 0.35 | Deemed to comply5 | | Triple4 | A | Any | Air | 0.50 | 0.44 | 0.26 | | | B | Any | Air | 0.45 | 0.39 | 0.22 | | | C | Any | Air | 0.41 | 0.34 | 0.20 | | | Any double low-e | Any | Air | 0.35 | 0.32 | 0.18 |

| 1 | Low-eA (emissivity) shall be 0.24 to 0.16. | | --- | --- | | | Low-eB (emissivity) shall be 0.15 to 0.08. | | | Low-eC (emissivity) shall be 0.07 or less. | | 2 | Aluminum Thermal Break = An aluminum thermal break framed window shall incorporate the following minimum design characteristics: | | a) | The thermal conductivity of the thermal break material shall be not more than 3.6 Btu-in/h/ft2/°F; | | b) | The thermal break material must produce a gap in the frame material of not less than 0.210 inches; and | | c) | All metal framing members of the products exposed to interior and exterior air shall incorporate a thermal break meeting the criteria in a and b above. | | 3 | A minimum air space of 0.375 inches between panes of glass is required for double glazing. | | 4 | A minimum air space of 0.25 inches between panes of glass is required for triple glazing. | | 5 | Deemed to comply glazing shall not be used for performance compliance. |

History

• Statutory Authority: RCW 19.27A.020, 19.27A.045 and chapters 19.27 and 34.05 RCW. WSR 13-04-055, § 51-11R-30315, filed 2/1/13, effective 7/1/13.

Wash. Admin. Code § 51-11R-30320 Section R303.2—Installation.

R303.2 Installation. All materials, systems and equipment shall be installed in accordance with the manufacturer's installation instructions and the International Building Code or International Residential Code, as applicable.

R303.2.1 Protection of exposed foundation insulation. Insulation applied to the exterior of basement walls, crawlspace walls and the perimeter of slab-on-grade floors shall have a rigid, opaque and weather-resistant protective covering to prevent the degradation of the insulation's thermal performance. The protective covering shall cover the exposed exterior insulation and extend a minimum of 6 inches (153 mm) below grade.

History

• Statutory Authority: RCW 19.27A.020, 19.27A.045 and chapters 19.27 and 34.05 RCW. WSR 13-04-055, § 51-11R-30320, filed 2/1/13, effective 7/1/13.

Wash. Admin. Code § 51-11R-30330 Section R303.3—Maintenance information.

R303.3 Maintenance information. Maintenance instructions shall be furnished for equipment and systems that require preventive maintenance. Required regular maintenance actions shall be clearly stated and incorporated on a readily visible label. The label shall include the title or publication number for the operation and maintenance manual for that particular model and type of product.

History

• Statutory Authority: RCW 19.27A.020, 19.27A.045, 19.27A.160, and chapter 19.27A RCW. WSR 23-02-060, 23-12-102, and 23-20-022, § 51-11R-30330, filed 1/3/23, 6/7/23, and 9/25/23, effective 3/15/24. Statutory Authority: RCW 19.27A.020, 19.27A.045 and chapters 19.27 and 34.05 RCW. WSR 13-04-055, § 51-11R-30330, filed 2/1/13, effective 7/1/13.

Wash. Admin. Code § 51-11R-40000 Chapter 4 RE—Residential energy efficiency.

Reviser's note: The brackets and enclosed material in the text of the above section occurred in the copy filed by the agency.

Wash. Admin. Code § 51-11R-40100 Section R401—General.

R401.1 Scope. This chapter applies to residential buildings. Group R-2 occupancy areas with dwelling units accessed from enclosed interior corridors or other enclosed interior spaces must comply with the Washington State Energy Code (WSEC), Commercial Provisions. Other Group R-2 occupancy areas are permitted to comply with the WSEC, Commercial Provisions, in lieu of the WSEC, Residential Provisions.

| EXCEPTION: | Water heaters that each serve only an individual Group R-2 dwelling unit in a building three stories or less above grade plane are permitted to comply with the requirements of the WSEC, Residential Provisions. | | --- | --- |

R401.2 Compliance. Projects shall comply with one of the following:

1. Sections R401 through R404. In addition, dwelling units and sleeping units in a residential building shall comply with Section R406.

2. Section R405.

3. Section R407.

R401.3 Certificate. A permanent certificate shall be completed by the builder or other approved party and posted on a wall in the space where the furnace is located, a utility room, or an approved location inside the building. When located on an electrical panel, the certificate shall not cover or obstruct the visibility of the circuit directory label, service disconnect label, or other required labels. The certificate shall indicate the following:

1. The predominant R-values of insulation installed in or on ceiling/roof, walls, foundation (slab, below-grade wall, and/or floor) and ducts outside conditioned spaces.

2. U-factors for fenestration and the solar heat gain coefficient (SHGC) of fenestration. Where there is more than one value for each component, the certificate shall indicate the area weighted average value.

3. The results from any required duct system and building envelope air leakage testing done on the building.

4. The results from the whole-house mechanical ventilation system flow rate test.

5. The types, sizes, and efficiencies of heating, cooling, whole-house mechanical ventilation, and service water heating appliances. Where a gas-fired unvented room heater, electric furnace, or baseboard electric heater is installed in the residence, the certificate shall list "gas-fired unvented room heater," "electric furnace" or "baseboard electric heater," as appropriate. An efficiency shall not be listed for gas-fired unvented room heaters, electric furnaces or electric baseboard heaters.

6. Where on-site photovoltaic panel systems have been installed, the array capacity, inverter efficiency, panel tilt, orientation and estimated annual electrical generation shall be noted on the certificate.

7. The code edition under which the structure was permitted, and the compliance path used.

The code official may require that documentation for any required test results include an electronic record of the time, date, and location of the test. A date-stamped smart phone photo or air leakage testing software may be used to satisfy this requirement.

History

• Statutory Authority: RCW 19.27A.020, 19.27A.045, 19.27A.160, and chapter 19.27A RCW. WSR 23-02-060, 23-12-102, and 23-20-022, § 51-11R-40100, filed 1/3/23, 6/7/23, and 9/25/23, effective 3/15/24. Statutory Authority: RCW 19.27A.020, 19.27A.045, 19.27A.160 and chapter 19.27 RCW. WSR 20-01-047, § 51-11R-40100, filed 12/9/19, effective 7/1/20. Statutory Authority: RCW 19.27A.020, 19.27A.045, 19.27A.160, and 19.27.074. WSR 16-02-127, § 51-11R-40100, filed 1/6/16, effective 7/1/16. Statutory Authority: RCW 19.27A.020, 19.27A.045 and chapters 19.27 and 34.05 RCW. WSR 13-04-055, § 51-11R-40100, filed 2/1/13, effective 7/1/13.

Wash. Admin. Code § 51-11R-40200 Section R402—Building thermal envelope.

History

• Statutory Authority: RCW 19.27A.020, 19.27A.045 and chapters 19.27 and 34.05 RCW. WSR 13-04-055, § 51-11R-40200, filed 2/1/13, effective 7/1/13.

Wash. Admin. Code § 51-11R-40210 Section R402.1—General.

R402.1 General. The building thermal envelope shall meet the requirements of Sections R402.1.1 through R402.1.6.

| EXCEPTION: | The following buildings, or portions thereof, separated from the remainder of the building by building thermal envelope assemblies complying with this code shall be exempt from the building thermal envelope provisions of this code. | | --- | --- | | | 1. Those with a peak design rate of energy usage less than 3.4 Btu/h ft2 (10.7 W/m2) or 1.0 watt/ft2 of floor area for space conditioning purposes. | | | 2. Those that do not contain conditioned space. | | | 3. Greenhouses isolated from any conditioned space and not intended for occupancy. |

R402.1.1 Vapor retarder. Wall assemblies in the building thermal envelope shall comply with the vapor retarder requirements of Section R702.7 of the International Residential Code or Section 1404.3 of the International Building Code, as applicable.

R402.1.2 Insulation and fenestration criteria. The building thermal envelope shall meet the requirements of Table R402.1.2 based on the climate zone specified in Chapter 3. Assemblies shall have a U-factor equal to or less than that specified in Table R402.1.2. Fenestration shall have a U-factor equal to or less than specified in Table R402.1.2.

R402.1.3 R-value alternative. Assemblies with R-value of insulation materials equal to or greater than that specified in Table R402.1.3 shall be an alternative to the U-factor in Table R402.1.2.

R402.1.4 R-value computation.Cavity insulation alone shall be used to determine compliance with the cavity insulation R-value requirement in Table R402.1.3. Where cavity insulation is installed in multiple layers, the R-values of the cavity insulation layers shall be summed to determine compliance with the cavity insulation R-value requirements. The manufacturer's settled R-value shall be used for blown insulation. Continuous insulation (ci) alone shall be used to determine compliance with the continuous insulation R-value requirements in Table R402.1.3. Where continuous insulation is installed in multiple layers, the R-values of the continuous insulation layers shall be summed to determine compliance with the continuous insulation R-value requirements. Computed R-values shall not include an R-value for other building materials or air films. Where insulated siding is used for the purpose of complying with the continuous insulation requirements of Table R402.1.3, the manufacturer's labeled R-value for insulated siding shall be reduced by R-0.6.

R402.1.5 Total UA alternative. If the proposed building thermal envelope UA is less than or equal to the target UA, the building shall be considered in compliance with Table R402.1.2. The proposed UA shall be calculated in accordance with Equation 2. The target UA shall be calculated in accordance with Equation 1. U-factors shall be determined as specified in Section R402.1.6. In addition to UA compliance, the maximum fenestration U-factors of Section R402.5 shall be met.

R402.1.6 U-factor reference and calculations. The U-factors for typical construction assemblies are included in Appendix A in chapter 51-11C WAC. These values shall be used for all calculations. Where proposed construction assemblies are not represented in Appendix A, values shall be calculated in accordance with the ASHRAE Handbook of Fundamentals using the framing factors listed in Appendix A where applicable and shall include the thermal bridging effects of framing materials. The SHGC requirements shall be met in addition to UA compliance.

Fenestration U-factors shall comply with Section R303.1.3, Fenestration product rating.

History

• Statutory Authority: RCW 19.27A.020, 19.27A.045, 19.27A.160, and chapter 19.27A RCW. WSR 24-03-084, § 51-11R-40210, filed 1/16/24, effective 3/15/24
• WSR 23-02-060, 23-12-102, and 23-20-022, § 51-11R-40210, filed 1/3/23, 6/7/23, and 9/25/23, effective 3/15/24. Statutory Authority: RCW 19.27A.020, 19.27A.045, 19.27A.160 and chapter 19.27 RCW. WSR 20-01-047, § 51-11R-40210, filed 12/9/19, effective 7/1/20. Statutory Authority: RCW 19.27A.025, 19.27A.045, 19.27A.160, and 19.27.074. WSR 17-10-063, § 51-11R-40210, filed 5/2/17, effective 6/2/17. Statutory Authority: RCW 19.27A.020, 19.27A.045, 19.27A.160, and 19.27.074. WSR 16-02-127, § 51-11R-40210, filed 1/6/16, effective 7/1/16. Statutory Authority: RCW 19.27A.020, 19.27A.045 and chapters 19.27 and 34.05 RCW. WSR 13-04-055, § 51-11R-40210, filed 2/1/13, effective 7/1/13.

Wash. Admin. Code § 51-11R-40211 Table R402.1.2—Insulation and fenestration requirements by component.

TABLE R402.1.2

INSULATION AND FENESTRATION REQUIREMENTS BY COMPONENTa

| CLIMATE ZONE 5 AND MARINE 4 | | | | --- | --- | --- | | Fenestration U-factorb | 0.30 | | | Skylight U-factor | 0.50 | | | Ceiling U-factor | 0.024 | | | Above-Grade Wall U-factor | 0.056 | | | Floor U-factor | 0.029 | | | Slab on Grade F-factor | 0.54 | | | Below Grade 2' Depth | | | | | Wall U-factor | 0.042 | | | Slab F-factor | 0.59 | | Below Grade 3.5' Depth | | | | | Wall U-factor | 0.040 | | | Slab F-factor | 0.56 | | Below Grade 7' Depth | | | | | Wall U-factor | 0.035 | | | Slab F-factor | 0.50 |

| a | U-factors or F-factors shall be obtained from measurement, calculation, or an approved source or as specified in Section R402.1.5. | | --- | --- | | b | A maximum U-factor of 0.32 shall apply to vertical fenestration products installed in buildings located above 4000 feet in elevation above sea level, or in windborne debris regions where protection of openings is required under Section R301.2.1.2 of the International Residential Code. |

History

• Statutory Authority: RCW 19.27A.020, 19.27A.045, 19.27A.160, and chapter 19.27A RCW. WSR 23-02-060, 23-12-102, and 23-20-022, § 51-11R-40211, filed 1/3/23, 6/7/23, and 9/25/23, effective 3/15/24. Statutory Authority: RCW 19.27A.020, 19.27A.045, 19.27A.160 and chapter 19.27 RCW. WSR 20-01-047, § 51-11R-40211, filed 12/9/19, effective 7/1/20. Statutory Authority: RCW 19.27A.025, 19.27A.045, 19.27A.160, and 19.27.074. WSR 17-10-063, § 51-11R-40211, filed 5/2/17, effective 6/2/17. Statutory Authority: RCW 19.27A.020, 19.27A.045, 19.27A.160, and 19.27.074. WSR 16-02-127, § 51-11R-40211, filed 1/6/16, effective 7/1/16. Statutory Authority: RCW 19.27A.025, 19.27A.045, and 19.27.074. WSR 13-20-121, § 51-11R-40211, filed 10/1/13, effective 11/1/13. Statutory Authority: RCW 19.27A.020, 19.27A.045 and chapters 19.27 and 34.05 RCW. WSR 13-04-055, § 51-11R-40211, filed 2/1/13, effective 7/1/13.

Wash. Admin. Code § 51-11R-40213 Table R402.1.3—Insulation minimum R-values and fenestration requirements by components.

TABLE R402.1.3

INSULATION MINIMUM R-VALUES AND FENESTRATION REQUIREMENTS BY COMPONENTSa

| Climate Zone 5 and Marine 4 | | | --- | --- | | Fenestrationb,jU-Factor | 0.30 | | SkylightbU-Factor | 0.50 | | CeilingeR-Value | 60 | | Wood Frame Wallg,iR-Value | 20+5 or 13+10 | | Floor R-Value | 30 | | Below-Grade Wallc,hR-Value | 10/15/21 int + 5TB | | Slabd,fR-Value and Depth | 10, 4 ft. |

| For SI: | 1 foot = 304.8 mm, ci = continuous insulation, int = intermediate framing. | | --- | --- | | | aR-values are minimums. U-factors and SHGC are maximums. When insulation is installed in a cavity which is less than the label or design thickness of the insulation, the compressed R-value of the insulation from Appendix A Table A101.4 of chapter 51-11C WAC shall not be less than the R-value specified in the table. | | | b The fenestration U-factor column excludes skylights. | | | c "10/15/21+5TB" means R-10 continuous insulation on the exterior of the wall, or R-15 on the continuous insulation on the interior of the wall, or R-21 cavity insulation plus a thermal break between the slab and the basement wall at the interior of the basement wall. "10/15/21+5TB" shall be permitted to be met with R-13 cavity insulation on the interior of the basement wall plus R-5 continuous insulation on the interior or exterior of the wall. "TB" means R-5 thermal break between floor slab and basement wall. | | | d R-10 continuous insulation is required under heated slab on grade floors. See Section R402.2.9.1. | | | e For single rafter- or joist-vaulted ceilings, the insulation may be reduced to R-38 if the full insulation depth extends over the top plate of the exterior wall. | | | f R-7.5 continuous insulation installed over an existing slab is deemed to be equivalent to the required perimeter slab insulation when applied to existing slabs complying with Section R503.1.1. If foam plastic is used, it shall meet the requirements for thermal barriers protecting foam plastics. | | | g For log structures developed in compliance with Standard ICC 400, log walls shall meet the requirements for climate zone 5 of ICC 400. | | | h Int. (intermediate framing) denotes framing and insulation as described in Section A103.2.2 including standard framing 16 inches on center, 78 percent of the wall cavity insulated and headers insulated with a minimum of R-10 insulation. | | | i The first value is cavity insulation, the second value is continuous insulation. Therefore, as an example "13+10" means R-13 cavity insulation plus R-10 continuous insulation. | | | j A maximum U-factor of 0.32 shall apply to vertical fenestration products installed in buildings located above 4000 feet in elevation above sea level, or in windborne debris regions where protection of openings is required under Section R301.2.1.2 of the International Residential Code. |

History

• Statutory Authority: RCW 19.27A.020, 19.27A.045, 19.27A.160, and chapter 19.27A RCW. WSR 24-03-084, § 51-11R-40213, filed 1/16/24, effective 3/15/24
• WSR 23-02-060, 23-12-102, and 23-20-022, § 51-11R-40213, filed 1/3/23, 6/7/23, and 9/25/23, effective 3/15/24. Statutory Authority: RCW 19.27A.020, 19.27A.045, 19.27A.160 and chapter 19.27 RCW. WSR 20-01-047, § 51-11R-40213, filed 12/9/19, effective 7/1/20. Statutory Authority: RCW 19.27A.020, 19.27A.045, 19.27A.160, and 19.27.074. WSR 16-02-127, § 51-11R-40213, filed 1/6/16, effective 7/1/16. Statutory Authority: RCW 19.27A.020, 19.27A.045 and chapters 19.27 and 34.05 RCW. WSR 13-04-055, § 51-11R-40213, filed 2/1/13, effective 7/1/13.

Wash. Admin. Code § 51-11R-40215 Target/Proposed UA equations.

EQUATION 1 - GROUP R OCCUPANCY

TARGET UA

| UAT = UWAW + UBGWABGW + UVGAVG + UOGAOG + UFAF + URCARC + UDAD + FSPS + FBGSPBGS | | --- |

| Where: | | | | | --- | --- | --- | --- | | | UAT | = | The target combined thermal transmittance of the gross exterior wall, floor and roof/ceiling area. | | | UW | = | The thermal transmittance value of the opaque above grade wall found in Table R402.1.2. | | | AW | = | Opaque above grade wall area. | | | UBGW | = | The thermal transmittance value of the below grade opaque wall found in Table R402.1.2. | | | ABGW | = | Opaque below grade wall area. | | | UVG | = | The thermal transmittance value of the fenestration found in Table R402.1.2. | | | AVG | = | (a) The proposed glazing area; where proposed fenestration glazing area is less than 15 percent of the conditioned floor area, minus AOG. | | | | | (b) 15 percent of the conditioned floor area; where the proposed fenestration glazing area is 15 percent or more of the conditioned floor area, minus AOG. | | | UOG | = | The thermal transmittance value of the skylight glazing found in Table R402.1.2. | | | AOG | = | Skylight glazing area (if the proposed AOG exceeds 15 percent, the target AOG shall be 15 percent of the total floor area of the conditioned space). | | | UF | = | The thermal transmittance value of the floor found in Table R402.1.2. | | | AF | = | Floor area over unconditioned space. | | | URC | = | The thermal transmittance value of the ceiling found in Table R402.1.2. | | | ARC | = | Roof/ceiling area. | | | UD | = | The thermal transmittance value of the fenestration found in Table R402.1.2. | | | AD | = | Opaque door area. | | | FS | = | Concrete slab on grade component F-factor found in Table R402.1.2. | | | PS | = | Lineal ft. of concrete slab on grade perimeter. | | | FBGS | = | Concrete below grade slab component F-factor found in Table R402.1.2. | | | PBGS | = | Lineal ft. of concrete below grade slab perimeter. |

EQUATION 2 - GROUP R OCCUPANCY

PROPOSED UA

| UA = UWAW + UBGWABGW + UVGAVG + UOGAOG + UFAF + URCARC + UDAD + FSPS + FBGSPBGS | | --- |

| Where: | | | | | --- | --- | --- | --- | | | UA | = | The combined thermal transmittance of the gross exterior wall, floor and roof/ceiling assembly area. | | | UW | = | The thermal transmittance of the opaque above grade wall area. | | | AW | = | Opaque above grade wall area. | | | UBGW | = | The thermal transmittance value of the below grade opaque wall. | | | ABGW | = | Opaque below grade wall area. | | | UVG | = | The thermal transmittance value of the fenestration glazing. | | | AVG | = | Fenestration glazing area, including windows in exterior doors. | | | UOG | = | The thermal transmittance value of the skylight glazing. | | | AOG | = | Skylight glazing area. | | | UF | = | The thermal transmittance of the floor. | | | AF | = | Floor area over unconditioned space. | | | URC | = | The thermal transmittance of the ceiling. | | | ARC | = | Ceiling area. | | | UD | = | The thermal transmittance value of the opaque door area. | | | AD | = | Opaque door area. | | | FS | = | Concrete slab on grade component F-factor. | | | PS | = | Lineal ft. of concrete slab on grade perimeter. | | | FBGS | = | Concrete below grade slab component F-factor. | | | PBGS | = | Lineal ft. of concrete below grade slab perimeter. |

| NOTE: | Where more than one type of wall, window, roof/ceiling, door and skylight is used, the U and A terms for those items shall be expanded into subelements as: | | --- | --- | | | UW1AW1 + UW2AW2 + UW3AW3 + ...etc. |

| NOTE: | Below grade walls: The wall is assumed to extend from the slab upward to the top of the mud sill for the distance specified in Table A104.1, with 6 inches of concrete wall extending above grade. This will be calculated separately from above grade walls using the wall height that best describes the system. | | --- | --- |

History

• Statutory Authority: RCW 19.27A.020, 19.27A.045, 19.27A.160, and chapter 19.27A RCW. WSR 23-02-060, 23-12-102, and 23-20-022, § 51-11R-40215, filed 1/3/23, 6/7/23, and 9/25/23, effective 3/15/24. Statutory Authority: RCW 19.27A.020, 19.27A.045, 19.27A.160 and chapter 19.27 RCW. WSR 20-01-047, § 51-11R-40215, filed 12/9/19, effective 7/1/20.

Wash. Admin. Code § 51-11R-40220 Section R402.2—Specific insulation requirements.

R402.2 Specific insulation requirements. In addition to the requirements of Section R402.1, insulation shall meet the specific requirements of Sections R402.2.1 through R402.2.11.

R402.2.1 Ceilings with attic spaces. Where Section R402.1.3 would require R-60 in the ceiling or attic, installing R-49 over 100 percent of the ceiling area requiring insulation shall satisfy the requirement for R-60 wherever the full height of uncompressed R-49 insulation extends over the wall top plate at the eaves. This reduction shall not apply to the insulation and fenestration criteria in Section R402.1.2 and the total UA alternative in Section R402.1.5.

R402.2.1.1 Loose insulation in attic spaces. Open-blown or poured loose fill insulation may be used in attic spaces where the slope of the ceiling is not more than 3 feet in 12 and there is at least 30 inches of clear distance from the top of the bottom chord of the truss or ceiling joist to the underside of the sheathing at the roof ridge.

R402.2.2 Reserved.

R402.2.3 Eave baffle. For air-permeable insulation in vented attics, a baffle shall be installed adjacent to soffit and eave vents. Baffles shall maintain a net free area opening equal to or greater than the size of the vent. The baffle shall extend over the top of the attic insulation. The baffle shall be permitted to be any solid material. The baffle shall be installed to the outer edge of the exterior wall top plate so as to provide maximum space for attic insulation coverage over the top plate. Where soffit venting is not continuous, baffles shall be installed continuously to prevent ventilation air in the eave soffit from bypassing the baffle.

R402.2.4 Access hatches and doors. Access hatches and doors from conditioned spaces to unconditioned spaces such as attics and crawl spaces shall be insulated to the same R-value required by Table R402.1.3 for the wall or ceiling in which they are installed.

| EXCEPTION: | Vertical doors providing access from conditioned spaces to unconditioned spaces that comply with the fenestration requirements of Table R402.1.3. | | --- | --- |

R402.2.4.1 Access hatches and door insulation installation and retention. Vertical or horizontal access hatches and doors from conditioned spaces to unconditioned spaces such as attics and crawl spaces shall be weatherstripped. Access that prevents damaging or compressing the insulation shall be provided to all equipment. Where loose fill insulation is installed, a wood framed or equivalent baffle or retainer, or dam shall be installed to prevent the loose-fill insulation from spilling into the living spaces, from higher to lower sections of the attic and from attics covering conditioned spaces to unconditioned spaces. The baffle or retainer shall provide a permanent means of maintaining the installed R-value of the loose fill insulation.

R402.2.5 Mass walls. Mass walls, where used as a component of the building thermal envelope, shall be one of the following:

1. Above-grade walls of concrete block, concrete, insulated concrete form, masonry cavity, brick (but not brick veneer), adobe, compressed earth block, rammed earth, mass timber, or solid logs.

2. Any other wall having a heat capacity greater than or equal to 6 Btu/ft2 x °F (123 kJ/m2 x K).

R402.2.6 Steel-frame ceilings, walls, and floors. Steel-frame ceilings, walls, and floors shall comply with the U-factor requirements of Table R402.1.2.

R402.2.7 Floors. Floor framing cavity insulation shall comply with one of the following:

1. Insulation shall be installed to maintain permanent contact with the underside of the subfloor decking in accordance with manufacturer instructions to maintain required R-value or readily fill the available cavity space. Insulation supports shall be installed so spacing is no more than 24 inches on center. Foundation vents shall be placed so that the top of the vent is below the lower surface of the floor insulation.

2. Floor framing cavity insulation shall be permitted to be in contact with the top side of sheathing separating the cavity and the unconditioned space below. Insulation shall extend from the bottom to the top of all perimeter floor framing members and the framing members shall be air sealed.

3. A combination of cavity and continuous insulation shall be installed so that the cavity insulation is in contact with the top side of the continuous insulation that is installed on the underside of the floor framing separating the cavity and the unconditioned space below. The combined R-value of the cavity and continuous insulation shall equal the required R-value for floors. Insulation shall extend from the bottom to the top of all perimeter floor framing members and the framing members shall be air sealed.

| EXCEPTIONS: | 1. When foundation vents are not placed so that the top of the vent is below the lower surface of the floor insulation, a permanently attached baffle shall be installed at an angle of 30° from horizontal, to divert air flow below the lower surface of the floor insulation. | | --- | --- | | | 2. Substantial contact with the surface being insulated is not required in enclosed floor/ceiling assemblies containing ducts where full R-value insulation is installed between the duct and the exterior surface. |

R402.2.8 Below-grade walls. Below-grade exterior wall insulation used on the exterior (cold) side of the wall shall extend from the top of the below-grade wall to the top of the footing and shall be approved for below-grade use. Above-grade insulation shall be protected. Insulation used on the interior (warm) side of the wall shall extend from the top of the below-grade wall to the below-grade floor level and shall include R-5 rigid board providing a thermal break between the concrete wall and the slab.

R402.2.9 Slab-on-grade floors. The minimum thermal resistance (R-value) of the insulation around the perimeter of unheated or heated slab-on-grade floors shall be as specified in Table C402.1.3. The insulation shall be placed on the outside of the foundation or on the inside of the foundation wall. The insulation shall extend downward from the top of the slab for a minimum distance as shown in the table or to the top of the footing, whichever is less, or downward to at least the bottom of the slab and then horizontally to the interior or exterior for the total distance shown in the table. A two-inch by two-inch (maximum) pressure treated nailer may be placed at the finished floor elevation for attachment of interior finish materials. Insulation extending away from the building shall be protected by pavement or by a minimum of 10 inches (254 mm) of soil.

R402.2.9.1 Heated slab-on-grade floors. The entire area of a heated slab-on-grade floor shall be thermally isolated from the soil with a minimum of R-10 insulation. The insulation shall be an approved product for its intended use. If a soil gas control system is present below the heated slab-on-grade floor, which results in increased convective flow below the heated slab-on-grade floor, the heated slab-on-grade floor shall be thermally isolated from the sub-slab gravel layer. R-10 heated slab-on-grade floor insulation is required for all compliance paths.

R402.2.10 Masonry veneer. Insulation shall not be required on the horizontal portion of the foundation that supports a masonry veneer.

History

• Statutory Authority: RCW 19.27A.020, 19.27A.045, 19.27A.160, and chapter 19.27A RCW. WSR 23-02-060, 23-12-102, and 23-20-022, § 51-11R-40220, filed 1/3/23, 6/7/23, and 9/25/23, effective 3/15/24. Statutory Authority: RCW 19.27A.045 and chapter 19.27A RCW. WSR 20-21-081, § 51-11R-40220, filed 10/19/20, effective 2/1/21. Statutory Authority: RCW 19.27A.020, 19.27A.045, 19.27A.160 and chapter 19.27 RCW. WSR 20-01-047, § 51-11R-40220, filed 12/9/19, effective 7/1/20. Statutory Authority: RCW 19.27A.020, 19.27A.045, 19.27A.160, and 19.27.074. WSR 16-02-127, § 51-11R-40220, filed 1/6/16, effective 7/1/16. Statutory Authority: RCW 19.27A.020, 19.27A.045 and chapters 19.27 and 34.05 RCW. WSR 13-04-055, § 51-11R-40220, filed 2/1/13, effective 7/1/13.

Wash. Admin. Code § 51-11R-40230 Section R402.3—Fenestration.

R402.3 Fenestration. In addition to the requirements of Section R402, fenestration shall comply with Sections R402.3.1 through R402.3.6.

R402.3.1 U-factor. An area-weighted average of fenestration products shall be permitted to satisfy the U-factor requirements.

R402.3.2 Glazed fenestration SHGC. An area-weighted average of fenestration products more than 50 percent glazed shall be permitted to satisfy the SHGC requirements.

R402.3.3 Glazed fenestration exemption. Up to 15 square feet (1.4 m2) of glazed fenestration per dwelling unit shall be permitted to be exempt from U-factor and SHGC requirements in Section R402.1.2. This exemption shall not apply to the total UA alternative in Section R402.1.5.

R402.3.4 Opaque door exemption. One side-hinged opaque door assembly up to 24 square feet (2.22 m2) in area is exempted from the U-factor requirement in Section R402.1.2. This exemption shall not apply to the total UA alternative in Section R402.1.5.

R402.3.5Combustion air openings. Where open combustion air ducts provide combustion air to open combustion, space conditioning fuel burning appliances, the appliances and combustion air openings shall be located outside of the building thermal envelope, or enclosed in a room isolated from inside the thermal envelope. Such rooms shall be sealed and insulated in accordance with the envelope requirements of Table R402.1.3, where the walls, floors, and ceilings shall meet the minimum of the below-grade wall R-value requirements. The door into the room shall be fully gasketed and any water lines and ducts in the room insulated in accordance with Section R403. The combustion air duct shall be insulated where it passes through conditioned space to a minimum of R-8.

| EXCEPTIONS: | 1. Direct vent appliances with both intake and exhaust pipes installed continuous to the outside. | | --- | --- | | | 2. Fireplaces and stoves complying with Section R402.3.6 of this code and Section R1006 of the International Residential Code. |

R402.3.6 Fireplaces. New wood-burning fireplaces shall have tight-fitting flue dampers or doors, and outdoor combustion air. When using tight-fitting doors on factory-built fireplaces listed and labeled in accordance with UL 127, the doors shall be tested and listed for the fireplace. Where using tight-fitting doors on masonry fireplaces, the doors shall be listed and labeled in accordance with UL 907. Gas fireplaces shall comply with the efficiency requirements in Section R403.7.2.

History

• Statutory Authority: RCW 19.27A.020, 19.27A.045, 19.27A.160 and chapter 19.27A RCW. WSR 24-03-084, § 51-11R-40230, filed 1/16/24, effective 3/15/24
• WSR 23-02-060, 23-12-102, and 23-20-022, § 51-11R-40230, filed 1/3/23, 6/7/23, and 9/25/23, effective 3/15/24. Statutory Authority: RCW 19.27A.020, 19.27A.045, 19.27A.160 and chapter 19.27 RCW. WSR 20-01-047, § 51-11R-40230, filed 12/9/19, effective 7/1/20. Statutory Authority: RCW 19.27A.020, 19.27A.045, 19.27A.160, and 19.27.074. WSR 16-02-127, § 51-11R-40230, filed 1/6/16, effective 7/1/16. Statutory Authority: RCW 19.27A.020, 19.27A.045 and chapters 19.27 and 34.05 RCW. WSR 13-04-055, § 51-11R-40230, filed 2/1/13, effective 7/1/13.

Wash. Admin. Code § 51-11R-40240 Section R402.4—Air leakage.

R402.4 Air leakage. The building thermal envelope shall be constructed to limit air leakage in accordance with the requirements of Sections R402.4.1 through R402.4.4.

R402.4.1 Building thermal envelope air leakage. The building thermal envelope shall comply with Sections R402.4.1.1 through R402.4.1.3. The sealing methods between dissimilar materials shall allow for differential expansion and contraction.

R402.4.1.1 Installation. The components of the building thermal envelope as listed in Table R402.4.1.1 shall be installed in accordance with the manufacturer's instructions and the criteria listed in Table R402.4.1.1, as applicable to the method of construction. Where required by the code official, an approved third party shall inspect all components and verify compliance.

R402.4.1.2 Testing. The building or dwelling unit shall be tested for air leakage. Testing shall be conducted in accordance with RESNET/ICC 380, ASTM E779 or ASTM E1827. Test pressure and leakage rate shall comply with Section R402.1.3. A written report of the test results, including verified location and time stamp of the date of the test, shall be signed by the testing agency and provided to the building owner and code official. Testing shall be performed at any time after creation of all penetrations of the building thermal envelope. Once visual inspection has confirmed air sealing has been conducted in accordance with Table R402.4.1.1, operable windows and doors manufactured by small business are permitted to be sealed off at the frame prior to the test.

Testing of single-family dwellings and townhouses shall be conducted in accordance with RESNET/ICC 380. Test pressure and leakage rate shall comply with Section R402.1.3.1.

For Group R-2 occupancies, testing shall be conducted in accordance with ASTM E779, ASTM E1827, or ASTM E3158. Test pressure and leakage rate shall comply with Section R402.1.3.2. The individual performing the air leakage test shall be trained and certified by a certification body that is, at the time of permit application, an ISO 17024 accredited certification body including, but not limited to, the Air Barrier Association of America.

During testing:

1. Exterior windows and doors, fireplace and stove doors shall be closed, but not sealed, beyond the intended weatherstripping or other infiltration control measures;

2. Dampers including exhaust, intake, makeup air, backdraft and flue dampers shall be closed, but not sealed beyond intended infiltration control measures;

3. Interior doors, if installed at the time of the test, shall be open, access hatches to conditioned crawl spaces and conditioned attics shall be open;

4. Exterior or interior terminations for continuous ventilation systems and heat recovery ventilators shall be sealed;

5. Heating and cooling systems, if installed at the time of the test, shall be turned off; and

6. Supply and return registers, if installed at the time of the test, shall be fully open.

| EXCEPTION: | Additions less than 500 square feet of conditioned floor area. | | --- | --- |

R402.4.1.3 Leakage rate. Detached one- and two-family dwellings and multiple single-family dwellings (townhouses) shall comply with Section R402.4.1.3.1. Group R-2 multifamily buildings shall comply with Section R402.4.1.3.2.

R402.4.1.3.1 Dwelling unit leakage rate. The maximum air leakage rate for any dwelling unit under any compliance path shall not exceed 4.0 air changes per hour. Testing shall be conducted with a blower door test at a test pressure of 0.2 inches w.g. (50 Pa).

| EXCEPTION: | Additions tested with the existing home having a combined maximum air leakage rate of 7 air changes per hour. To qualify for this exception, the date of construction of the existing dwelling must be prior to the 2009 Washington State Energy Code. | | --- | --- |

R402.4.1.3.2 Group R-2 multifamily building leakage rate. For Group R-2 multifamily buildings, the maximum leakage rate for any dwelling unit shall not exceed 0.25 cfm per square foot of the dwelling unit enclosure area. Testing shall be conducted with a blower door at a test pressure of 0.2 inches w.g. (50 Pa). Doors and windows of adjacent dwelling units (including top and bottom units) shall be open to the outside during the test.

R402.4.2 Air leakage of fenestration. Windows, skylights and sliding glass doors shall have an air infiltration rate of no more than 0.3 cfm per square foot (1.5 L/s/m2), and swinging doors no more than 0.5 cfm per square foot (2.6 L/s/m2), when tested according to NFRC 400 or AAMA/WDMA/CSA 101/I.S.2/A440 by an accredited, independent laboratory and listed and labeled by the manufacturer.

| EXCEPTIONS: | 1. Field-fabricated fenestration products (windows, skylights and doors). | | --- | --- | | | 2. Custom exterior fenestration products manufactured by a small business provided they meet the applicable provisions of Chapter 24 of the International Building Code. Once visual inspection has confirmed the presence of a gasket, operable windows and doors manufactured by small business shall be permitted to be sealed off at the frame prior to the test. |

R402.4.3 Recessed lighting. Recessed luminaires installed in the building thermal envelope shall be Type IC-rated and certified under ASTM E283 as having an air leakage rate not more than 2.0 cfm (0.944 L/s) when tested at a 1.57 psf (75 Pa) pressure differential and shall have a label attached showing compliance with this test method. All recessed luminaires shall be sealed with a gasket or caulk between the housing and the interior wall or ceiling covering.

R402.4.4 Electrical and communication outlet boxes (air-sealed boxes). Electrical and communication outlet boxes installed in the building thermal envelope shall be sealed to limit air leakage between conditioned and unconditioned spaces. Electrical and communication outlet boxes shall be tested in accordance with NEMA OS 4, Requirements for Air-Sealed Boxes for Electrical and Communication Applications, and shall have an air leakage rate of not greater than 2.0 cubic feet per minute (0.944 L/s) at a pressure differential of 1.57 psf (75 Pa). Electrical and communication outlet boxes shall be marked "NEMA OS 4" or "OS 4" in accordance with NEMA OS 4. Electrical and communication outlet boxes shall be installed per the manufacturer's instructions and with any supplied components required to achieve compliance with NEMA OS 4.

History

• Statutory Authority: RCW 19.27A.020, 19.27A.045, 19.27A.160, and chapter 19.27A RCW. WSR 24-03-084, § 51-11R-40240, filed 1/16/24, effective 3/15/24
• WSR 23-02-060, 23-12-102, and 23-20-022, § 51-11R-40240, filed 1/3/23, 6/7/23, and 9/25/23, effective 3/15/24. Statutory Authority: RCW 19.27A.045 and chapter 19.27A RCW. WSR 20-21-081, § 51-11R-40240, filed 10/19/20, effective 2/1/21. Statutory Authority: RCW 19.27A.020, 19.27A.045, 19.27A.160 and chapter 19.27 RCW. WSR 20-01-047, § 51-11R-40240, filed 12/9/19, effective 7/1/20. Statutory Authority: RCW 19.27A.020, 19.27A.045, 19.27A.160, and 19.27.074. WSR 16-02-127, § 51-11R-40240, filed 1/6/16, effective 7/1/16. Statutory Authority: RCW 19.27A.025, 19.27A.045, 19.27.020, and 19.27.074. WSR 14-24-123, § 51-11R-40240, filed 12/3/14, effective 1/3/15. Statutory Authority: RCW 19.27A.020, 19.27A.045 and chapters 19.27 and 34.05 RCW. WSR 13-04-055, § 51-11R-40240, filed 2/1/13, effective 7/1/13.

Wash. Admin. Code § 51-11R-40241 Table R402.4.1.1—Air barrier and insulation installation.

TABLE R402.4.1.1

AIR BARRIER, AIR SEALING AND INSULATION INSTALLATIONa

| COMPONENT | AIR BARRIER CRITERIA | INSULATION CRITERIA | | --- | --- | --- | | General requirements | A continuous air barrier shall be installed in the building envelope. | Air-permeable insulation shall not be used as a sealing material. | | Breaks or joints in the air barrier shall be sealed. | | | | Cavity insulation installation | | All cavities in the thermal envelope shall be filled with insulation. The density of the insulation shall be at the manufacturers' product recommendation and said density shall be maintained for all volume of each cavity. Batt type insulation will show no voids or gaps and maintain an even density for the entire cavity. Batt insulation shall be installed in the recommended cavity depth. Where an obstruction in the cavity due to services, blocking, bracing or other obstruction exists, the batt product will be cut to fit the remaining depth of the cavity. Where the batt is cut around obstructions, loose fill insulation shall be placed to fill any surface or concealed voids, and at the manufacturers' specified density. Where faced batt is used, the installation tabs must be stapled to the face of the stud. There shall be no compression to the batt at the edges of the cavity due to inset stapling installation tabs. | | Insulation that upon installation readily conforms to available space shall be installed filling the entire cavity and within the manufacturers' density recommendation. | | | | Ceiling/attic | The air barrier in any dropped ceiling/soffit shall be aligned with the insulation and any gaps in the air barrier sealed. | The insulation in any dropped ceiling/soffit shall be aligned with the air barrier. | | Access openings, drop down stair or knee wall doors to unconditioned attic spaces shall be sealed. | Batt insulation installed in attic roof assemblies may be compressed at exterior wall lines to allow for required attic ventilation. | | | Walls | The junction of the foundation and sill plate shall be sealed. The junction of the top plate and top of exterior walls shall be sealed. Knee walls shall be sealed. | Cavities within corners and headers of frame walls shall be insulated by completely filling the cavity with a material having a thermal resistance of R-3 per inch minimum. Exterior thermal envelope insulation for framed walls shall be installed in substantial contact and continuous alignment with the air barrier. | | Windows, skylights and doors | The space between window/door jambs and framing and skylights and framing shall be sealed. | | | Rim joists | Rim joists shall include an exterior air barrierb. | Rim joists shall be insulated so that the insulation maintains permanent contact with the exterior rim boardb. | | | The junctions of the rim board to the sill plate and the rim board and the subfloor shall be air sealed. | | | Floors (including above garage and cantilevered floors) | The air barrier shall be installed at any exposed edge of insulation. | Floor framing cavity insulation shall be installed to maintain permanent contact with the underside of subfloor decking or floor framing cavity insulation shall be permitted to be in contact with the topside of sheathing or continuous insulation installed on the underside of floor framing and extend from the bottom to the top of all perimeter floor framing members. | | Basement, crawl space, and slab foundations | Exposed earth in unvented crawl spaces shall be covered with a Class I, black vapor retarder with overlapping joints taped. | Crawl space insulation, where provided instead of floor insulation, shall be installed in accordance with Section R402.2.10. | | | Penetrations through concrete foundation walls and slabs shall be air sealed. | Conditioned basement foundation wall insulation shall be installed in accordance with Section R402.2.8. | | | Class I vapor retarders shall not be used as an air barrier on below-grade walls and shall be installed in accordance with Section R702.7 of the International Residential Code. | Slab on grade floor insulation shall be installed in accordance with Section R402.2.10. | | Shafts, penetrations | Duct and flue shafts to exterior or unconditioned space shall be air sealed. | Insulation shall be fitted tightly around utilities passing through shafts and penetrations in the building thermal envelope to maintain required R-value. | | | Utility penetrations of the air barrier shall be caulked, gasketed, or otherwise sealed and shall allow for expansion and contraction of materials and mechanical vibration. | | | Narrow cavities | Narrow cavities, of an inch or less, not able to be insulated, shall be air sealed. | Batts in narrow cavities shall be cut to fit and installed to the correct density without any voids or gaps or compression, or narrow cavities shall be filled by insulation that on installation readily conforms to the available cavity space. | | Garage separation | Air sealing shall be provided between the garage and conditioned spaces. | Insulated portions of the garage separation assembly shall be installed in accordance with Sections R303 and R402.2.8. | | Recessed lighting | Recessed light fixtures installed in the building thermal envelope shall be air sealed in accordance with Section R402.4.3. | Recessed light fixtures installed in the building thermal envelope shall be air tight and IC rated and shall be buried or surrounded with insulation. | | Plumbing, wiring, or other obstructions | All holes created by wiring, plumbing, or other obstructions in the air barrier assembly shall be air sealed. | Batt insulation shall be cut neatly to fit around wiring and plumbing in exterior walls. There shall be no voids or gaps or compression where cut to fit. Insulation that on installation readily conforms to available space shall extend behind piping and wiring. Insulation shall be installed to fill the available space and surround wiring, plumbing, or other obstructions, unless the required R-value can be met by installing insulation and air barrier systems completely to the exterior side of the obstructions. | | Shower/tub on exterior wall | The air barrier installed at exterior walls adjacent to showers and tubs shall separate the wall from the showers and tubs. | Exterior walls adjacent to showers and tubs shall be insulated. | | Electrical/phone box on exterior wall | The air barrier shall be installed behind electrical or communication boxes or air sealed boxes shall be installed. | | | HVAC register boots | HVAC supply and return register boots shall be sealed to the subfloor, wall covering or ceiling penetrated by the boot. | | | Concealed sprinklers | When required to be sealed, concealed fire sprinklers shall only be sealed in a manner that is recommended by the manufacturer. Caulking or other adhesive sealants shall not be used to fill voids between fire sprinkler cover plates and walls or ceilings. | |

| IC = insulation contact. | | --- | | a In addition, inspection of log walls shall be in accordance with the provisions of ICC-400. | | b Insulation installed in unconditioned/ventilated attic spaces is not required to be enclosed within an air barrier assembly. |

History

• Statutory Authority: RCW 19.27A.020, 19.27A.045, 19.27A.160, and chapter 19.27A RCW. WSR 24-03-084, § 51-11R-40241, filed 1/16/24, effective 3/15/24
• WSR 23-02-060, 23-12-102, and 23-20-022, § 51-11R-40241, filed 1/3/23, 6/7/23, and 9/25/23, effective 3/15/24. Statutory Authority: RCW 19.27A.020, 19.27A.045, 19.27A.160 and chapter 19.27 RCW. WSR 20-01-047, § 51-11R-40241, filed 12/9/19, effective 7/1/20. Statutory Authority: RCW 19.27A.020, 19.27A.045, 19.27A.160, and 19.27.074. WSR 16-02-127, § 51-11R-40241, filed 1/6/16, effective 7/1/16. Statutory Authority: RCW 19.27A.020, 19.27A.045 and chapters 19.27 and 34.05 RCW. WSR 13-04-055, § 51-11R-40241, filed 2/1/13, effective 7/1/13.

Wash. Admin. Code § 51-11R-40250 Section R402.5—Maximum fenestration U-factor and SHGC.

R402.5 Maximum fenestration U-factor. The area-weighted average maximum fenestration U-factor permitted using tradeoffs from Section R402.1.5 or R405 shall be 0.48 for vertical fenestration, and 0.75 for skylights.

| EXCEPTION: | The maximum U-factor and solar heat gain coefficient (SHGC) for fenestration shall not be required in storm shelters complying with ICC 500. | | --- | --- |

History

• Statutory Authority: RCW 19.27A.020, 19.27A.045, 19.27A.160, and chapter 19.27A RCW. WSR 23-02-060, 23-12-102, and 23-20-022, § 51-11R-40250, filed 1/3/23, 6/7/23, and 9/25/23, effective 3/15/24. Statutory Authority: RCW 19.27A.020, 19.27A.045, 19.27A.160 and chapter 19.27 RCW. WSR 20-01-047, § 51-11R-40250, filed 12/9/19, effective 7/1/20. Statutory Authority: RCW 19.27A.020, 19.27A.045, 19.27A.160, and 19.27.074. WSR 16-02-127, § 51-11R-40250, filed 1/6/16, effective 7/1/16. Statutory Authority: RCW 19.27A.020, 19.27A.045 and chapters 19.27 and 34.05 RCW. WSR 13-04-055, § 51-11R-40250, filed 2/1/13, effective 7/1/13.

Wash. Admin. Code § 51-11R-40300 Section R403—Systems.

History

• Statutory Authority: RCW 19.27A.020, 19.27A.045 and chapters 19.27 and 34.05 RCW. WSR 13-04-055, § 51-11R-40300, filed 2/1/13, effective 7/1/13.

Wash. Admin. Code § 51-11R-40310 Section R403.1—Controls.

R403.1 Controls. Not less than one thermostat shall be provided for each separate heating and cooling system.

R403.1.1 Programmable or connected thermostat. Where the primary heating system is a forced-air furnace, at least one thermostat per dwelling unit shall be Energy Star certified and capable of controlling the heating and cooling system on a daily schedule to maintain different temperature set points at different times of the day and different days of the week. The thermostat shall allow for, at a minimum, a 5-2 programmable schedule (weekdays/weekends) and be capable of providing at least two programmable setback/setup periods per day. This thermostat shall include the capability to set back, set up or temporarily operate the system to maintain zone temperatures down to 55°F (13°C) or up to 85°F (29°C). The thermostat shall be programmed initially by the manufacturer with a heating temperature set point of not greater than 70°F (21°C) and a cooling temperature set point of not less than 78°F (26°C). The thermostat and/or control system shall have an adjustable deadband of not less than 10°F.

| EXCEPTIONS: | 1. Systems controlled by an occupant sensor that is capable of shutting the system off when no occupant is sensed for a period of up to 30 minutes. | | --- | --- | | | 2. Systems controlled solely by a manually operated timer capable of operating the system for no more than two hours. | | | 3. Ductless mini-split heat pump systems that have an integral proprietary thermostat. |

R403.1.2 Heat pump supplementary heat. Unitary air cooled heat pumps shall include controls that minimize supplemental heat usage during start-up, set-up, and defrost conditions. These controls shall anticipate need for heat and use compression heating as the first stage of heat. Controls shall indicate when supplemental heating is being used through visual means (e.g., LED indicators). Heat pumps equipped with supplementary heaters shall be installed with controls that prevent supplemental heater operation above 40°F. At final inspection the auxiliary heat lock out control shall be set to 35°F or less.

R403.1.3 Continuously burning pilot lights. The natural gas systems and equipment listed below are not permitted to be equipped with continuously burning pilot lights.

1. Fan-type central furnaces.

2. Household cooking appliances.

| EXCEPTION: | Household cooking appliances without electrical supply voltage connections and in which each pilot light consumes less than 150 Btu/hr. | | --- | --- |

3. Pool heaters.

4. Spa heaters.

5. Fireplaces.

| EXCEPTION: | Any fireplace with on-demand, intermittent or interrupted ignition (as defined in ANSI Z21.20) is not considered continuous. | | --- | --- |

History

• Statutory Authority: RCW 19.27A.020, 19.27A.045, 19.27A.160, and chapter 19.27A RCW. WSR 23-02-060, 23-12-102, and 23-20-022, § 51-11R-40310, filed 1/3/23, 6/7/23, and 9/25/23, effective 3/15/24. Statutory Authority: RCW 19.27A.045 and 19.27A.020. WSR 22-13-100, § 51-11R-40310, filed 6/14/22, effective 7/15/22. Statutory Authority: RCW 19.27A.020, 19.27A.045, 19.27A.160 and chapter 19.27 RCW. WSR 20-01-047, § 51-11R-40310, filed 12/9/19, effective 7/1/20. Statutory Authority: RCW 19.27A.020, 19.27A.045, 19.27A.160, and 19.27.074. WSR 16-02-127, § 51-11R-40310, filed 1/6/16, effective 7/1/16. Statutory Authority: RCW 19.27A.020, 19.27A.045 and chapters 19.27 and 34.05 RCW. WSR 13-04-055, § 51-11R-40310, filed 2/1/13, effective 7/1/13.

Wash. Admin. Code § 51-11R-40315 Section R403.2—Hot water boiler.

R403.2 Hot water boiler temperature reset. The manufacturer shall configure each gas, oil, and electric boiler (other than a boiler equipped with a tankless domestic water heating coil) with an automatic means of adjusting the water temperature supplied by the boiler to ensure incremental change of the inferred heat load will cause an incremental change in the temperature of the water supplied by the boiler. This can be accomplished with outdoor reset, indoor reset, or water temperature sensing.

History

• Statutory Authority: RCW 19.27A.020, 19.27A.045, 19.27A.160, and chapter 19.27A RCW. WSR 23-02-060, 23-12-102, and 23-20-022, § 51-11R-40315, filed 1/3/23, 6/7/23, and 9/25/23, effective 3/15/24. Statutory Authority: RCW 19.27A.020, 19.27A.045, 19.27A.160, and 19.27.074. WSR 16-02-127, § 51-11R-40315, filed 1/6/16, effective 7/1/16.

Wash. Admin. Code § 51-11R-40320 Section R403.3—Ducts.

R403.3 Ducts. Ducts and air handlers shall be installed in accordance with Sections R403.3.1 through R403.3.7.

R403.3.1Ducts located outside conditioned space. Supply and return ducts located outside conditioned space shall be insulated to an R-value of not less than R-8 for ducts 3 inches (76 mm) in diameter and larger and not less than R-6 for ducts smaller than 3 inches (76 mm) in diameter. Ducts buried beneath a building shall be insulated as required per this section or have an equivalent thermal distribution efficiency. Ducts within a concrete slab or in the ground shall be insulated to R-10 with insulation designed to be used below grade. Underground ducts utilizing the thermal distribution efficiency method shall be listed and labeled to indicate the R-value equivalency.

R403.3.2 Ducts located in conditioned space. For ducts to be considered as being located inside a conditioned space, such ducts shall comply with the following:

1. All duct systems shall be located completely within the continuous air barrier and within the building thermal envelope.

2. All heating, cooling, and ventilation system components shall be installed inside the conditioned space including, but not limited to, forced air ducts, hydronic piping, hydronic floor heating loops, convectors and radiators. Combustion equipment shall be direct vent or sealed combustion.

3. For forced air ducts, a maximum of 10 linear feet of return ducts and 5 linear feet of supply ducts is permitted to be located outside the conditioned space, provided they are insulated to a minimum of R-8.

3.1. Metallic ducts located outside the conditioned space must have both transverse and longitudinal joints sealed with mastic.

3.2. If flex ducts are used, they cannot contain splices. Flex duct connections must be made with nylon straps and installed using a plastic strapping tensioning tool.

4. Ductwork in floor cavities located over unconditioned space shall comply with all of the following:

4.1. A continuous air barrier installed between unconditioned space and the duct.

4.2. Insulation installed in accordance with Section R402.2.7.

4.3. A minimum R-19 insulation installed in the cavity width separating the duct from unconditioned space.

5. Ductwork located within exterior walls of the building thermal envelope shall comply with the following:

5.1. A continuous air barrier installed between unconditioned space and the duct.

5.2. A minimum R-10 insulation installed in the cavity width separating the duct from unconditioned space.

5.3. The remainder of the cavity insulation shall be fully insulated to the drywall side.

R403.3.3 Ducts buried within ceiling insulation. Where supply and return air ducts are partially or completely buried in ceiling insulation, such ducts shall comply with all of the following:

1. The supply and return ducts shall have an insulation R-value not less than R-8.

2. At all points along each duct, the sum of the ceiling insulation R-value against and above the top of the duct, and against and below the bottom of the duct, shall be not less than R-19, excluding the R-value of the duct insulation.

| EXCEPTION: | Sections of the supply duct that are less than 3 feet (914 mm) from the supply outlet shall not be required to comply with these requirements. | | --- | --- |

R403.3.3.1 Effective R-value of deeply buried ducts. Where using the total building performance compliance option in Section R405, sections of ducts that are: Installed in accordance with Section R403.3.3; located directly on, or within 5.5 inches (140 mm) of the ceiling; surrounded with blown-in attic insulation having an R-value of R-30 or greater and located such that the top of the duct is not less than 3.5 inches (89 mm) below the top of the insulation, shall be considered as having an effective duct insulation R-value of R-25.

R403.3.4 Sealing. Ducts, air handlers, and filter boxes shall be sealed. Joints and seams shall comply with either the International Mechanical Code or International Residential Code, as applicable.

| EXCEPTIONS: | 1. Air-impermeable spray foam products shall be permitted to be applied without additional joint seals. | | --- | --- | | | 2. For ducts having a static pressure classification of less than 2 inches of water column (500 Pa), additional closure systems shall not be required for continuously welded joints and seams, and locking-type joints and seams of other than the snap-lock and button-lock types. |

R403.3.4.1 Sealed air handler. Air handlers shall have a manufacturer's designation for an air leakage of no more than 2 percent of the design air flow rate when tested in accordance with ASHRAE 193.

R403.3.5 Duct testing. Ducts shall be leak tested in accordance with WSU RS-33, using the maximum duct leakage rates specified.

| EXCEPTION: | A duct air leakage test shall not be required for ducts serving ventilation systems that are not integrated with the ducts serving heating or cooling systems. | | --- | --- |

A written report of the results shall be signed by the party conducting the test and provided to the code official.

R403.3.6 Duct leakage. The total leakage of the ducts, where measured in accordance with Section R403.3.3, shall be as follows:

1. Rough-in test: Total leakage shall be less than or equal to 4.0 cfm (113.3 L/min) per 100 square feet (9.29 m2) of conditioned floor area when tested at a pressure differential of 0.1 inches w.g. (25 Pa) across the system, including the manufacturer's air handler enclosure. All registers shall be taped or otherwise sealed during the test. If the air handler is not installed at the time of the test, total leakage shall be less than or equal to 3.0 cfm (85 L/min) per 100 square feet (9.29 m2) of conditioned floor area.

2. Postconstruction test: Leakage to outdoors shall be less than or equal to 4.0 cfm (113.3 L/min) per 100 square feet (9.29 m2) of conditioned floor area or total leakage shall be less than or equal to 4.0 cfm (113.3 L/min) per 100 square feet (9.29 m2) of conditioned floor area when tested at a pressure differential of 0.1 inches w.g. (25 Pa) across the entire system, including the manufacturer's air handler enclosure. All register boots shall be taped or otherwise sealed during the test.

3. Test for ducts within thermal envelope: Where all ducts and air handlers are located entirely within the building thermal envelope, total leakage shall be less than or equal to 8.0 cubic feet per minute (226.6 L/min) per 100 square feet (9.29 m2) of conditioned floor area. For forced air ducts, a maximum of 10 linear feet of return ducts and 5 linear feet of supply ducts may be located outside the conditioned space. All metallic ducts located outside the conditioned space must have both transverse and longitudinal joints sealed with mastic. If flex ducts are used, they cannot contain splices. Flex duct connections must be made with nylon straps and installed using a plastic strapping tensioning tool. Ducts located in crawl spaces do not qualify for this exception.

R403.3.7 Building cavities. Building framing cavities shall not be used as ducts or plenums. Installation of ducts in exterior walls, floors or ceilings shall not displace required envelope insulation.

History

• Statutory Authority: RCW 19.27A.020, 19.27A.045, 19.27A.160, and chapter 19.27A RCW. WSR 24-03-084, § 51-11R-40320, filed 1/16/24, effective 3/15/24
• WSR 23-02-060, 23-12-102, and 23-20-022, § 51-11R-40320, filed 1/3/23, 6/7/23, and 9/25/23, effective 3/15/24. Statutory Authority: RCW 19.27A.020, 19.27A.045, 19.27A.160 and chapter 19.27 RCW. WSR 20-01-047, § 51-11R-40320, filed 12/9/19, effective 7/1/20. Statutory Authority: RCW 19.27A.025, 19.27A.045, 19.27A.160, and 19.27.074. WSR 17-10-063, § 51-11R-40320, filed 5/2/17, effective 6/2/17. Statutory Authority: RCW 19.27A.020, 19.27A.045, 19.27A.160, and 19.27.074. WSR 16-02-127, § 51-11R-40320, filed 1/6/16, effective 7/1/16. Statutory Authority: RCW 19.27A.020, 19.27A.045 and chapters 19.27 and 34.05 RCW. WSR 13-04-055, § 51-11R-40320, filed 2/1/13, effective 7/1/13.

Wash. Admin. Code § 51-11R-40330 Section R403.4—Mechanical system piping insulation.

R403.4 Mechanical system piping insulation. Mechanical system piping capable of carrying fluids above 105°F (41°C) or below 55°F (13°C) shall be insulated to a minimum of R-6.

| EXCEPTION: | Up to 200 feet of hydronic system piping installed within the conditioned space may be insulated with a minimum of 1/2-inch insulation with a k value of 0.28. | | --- | --- |

R403.4.1 Protection of piping insulation. Piping insulation, including termination ends, exposed to weather shall be protected from damage, including that caused by sunlight, moisture, physical damage, and wind, and shall provide shielding from solar radiation that can cause degradation of the material. Protection shall be removable for the exposed length or no less than six inches from the equipment for maintenance. Adhesive tape shall not be permitted.

History

• Statutory Authority: RCW 19.27A.020, 19.27A.045, 19.27A.160, and chapter 19.27A RCW. WSR 23-02-060, 23-12-102, and 23-20-022, § 51-11R-40330, filed 1/3/23, 6/7/23, and 9/25/23, effective 3/15/24. Statutory Authority: RCW 19.27A.020, 19.27A.045, 19.27A.160 and chapter 19.27 RCW. WSR 20-01-047, § 51-11R-40330, filed 12/9/19, effective 7/1/20. Statutory Authority: RCW 19.27A.020, 19.27A.045, 19.27A.160, and 19.27.074. WSR 16-02-127, § 51-11R-40330, filed 1/6/16, effective 7/1/16. Statutory Authority: RCW 19.27A.020, 19.27A.045 and chapters 19.27 and 34.05 RCW. WSR 13-04-055, § 51-11R-40330, filed 2/1/13, effective 7/1/13.

Wash. Admin. Code § 51-11R-40340 Section R403.5—Service hot water systems.

R403.5 Service hot water systems. Energy conservation measures for service hot water systems shall be in accordance with this section. Service water-heating equipment shall meet the requirements of DOE 10 C.F.R. Part 430 Uniform Energy Factor or the equipment shall meet the requirements of Section C404.2.

R403.5.1 Heated water circulation and temperature maintenance systems. Heated water circulation systems shall be in accordance with Section R403.5.1.1. Heat trace temperature maintenance systems shall be in accordance with Section R403.5.1.2. Automatic controls, temperature sensors and pumps shall be in a location with access. Manual controls shall be in a location with ready access.

R403.5.1.1 Circulation systems. Heated water circulation systems shall be provided with a circulation pump. The system return pipe shall be a dedicated return pipe. Gravity and thermo-syphon circulation systems are prohibited. Controls automatically turn off the circulation pump when the water in the circulation loop is at the desired temperature and when there is no demand for hot water.

R403.5.1.1.1 Demand recirculation water systems serving an individual dwelling unit.Demand recirculation water systems shall have controls that start the pump upon receiving a signal from the action of a user of a fixture or appliance, sensing the presence of a user of a fixture or sensing the flow of hot or tempered water to a fixture fitting or appliance.

R403.5.1.2 Heat trace systems. Electric heat trace systems shall comply with IEEE 515.1 or UL 515. Controls for such systems shall automatically adjust the energy input to the heat tracing to maintain the desired water temperature in the piping in accordance with the times when heated water is used in the occupancy.

R403.5.2 Water volume determination. The volume shall be the sum of the internal volumes of pipe, fittings, valves, meters, and manifolds between the nearest source of heated water and the termination of the fixture supply pipe. Water heaters, circulating water systems, and heat trace temperature maintenance systems shall be considered to be sources of heated water. The volume in the piping shall be determined from Table C404.3.1 in the Washington State Energy Code, Commercial Provisions or Table L502.7 of the Uniform Plumbing Code. The volume contained within fixture shutoff valves, within flexible water supply connectors to a fixture fitting and within a fixture fitting shall not be included in the water volume determination. Where heated water is supplied by a recirculating system or heat-traced piping, the volume shall include the portion of the fitting on the branch pipe that supplies water to the fixture.

R403.5.3 Hot water pipe insulation. Insulation for service hot water pipe, both within and outside the conditioned space, shall have a minimum thermal resistance (R-value) of R-3.

| EXCEPTION: | Pipe insulation is permitted to be discontinuous where it passes through studs, joists or other structural members and where the insulated pipes pass other piping, conduit or vents, provided the insulation is installed tight to each obstruction. | | --- | --- |

R403.5.4 Drain water heat recovery units. Drain water heat recovery units shall comply with CSA 55.2 or IAPMO PS 92. Drain water heat recovery units shall be in accordance with CSA 55.1 or IAPMO IGC 346-2017.

R403.5.5 Water heater installation location. Service hot water systems shall be installed within the building thermal envelope.

| EXCEPTIONS: | 1. Where the hot water system efficiency is greater than or equal to 2.0 UEF. | | --- | --- | | | 2. Tankless water heaters. | | | 3. Gas heat pump water heaters intended for exterior installation. | | | 4. Atmospheric vented gas water heaters. |

R403.5.6 Water heater insulation. All tank-type water heaters in unconditioned spaces, or on concrete floors in conditioned spaces, shall be placed on an insulated surface with a minimum thermal resistance of R-10, and a minimum compressive strength of 40 psi or engineered to support the appliance.

R403.5.7

Supplementary heat for heat pump water heating systems. Heat pumps used for water heating and having supplementary water heating equipment shall have controls that limit supplementary water heating equipment operation to only those times when one of the following applies:

1. The heat pump water heater cannot meet hot water demand.

2. For heat pumps located in unconditioned space, the outside air temperature is below 40°F (4°C).

3. The heat pump is operating in defrost mode.

4. The vapor compression cycle malfunctions or loses power.

| EXCEPTION: | Heat trace temperature maintenance systems, provided the system capacity does not exceed the capacity of the heat pump water heating system. | | --- | --- |

History

• Statutory Authority: RCW 19.27A.020, 19.27A.045, 19.27A.160, and chapter 19.27A RCW. WSR 24-03-084, § 51-11R-40340, filed 1/16/24, effective 3/15/24
• WSR 23-02-060, 23-12-102, and 23-20-022, § 51-11R-40340, filed 1/3/23, 6/7/23, and 9/25/23, effective 3/15/24. Statutory Authority: RCW 19.27A.020, 19.27A.045, 19.27A.160 and chapter 19.27 RCW. WSR 20-01-047, § 51-11R-40340, filed 12/9/19, effective 7/1/20. Statutory Authority: RCW 19.27A.020, 19.27A.045, 19.27A.160, and 19.27.074. WSR 16-02-127, § 51-11R-40340, filed 1/6/16, effective 7/1/16. Statutory Authority: RCW 19.27A.025, 19.27A.045, 19.27.020, and 19.27.074. WSR 14-24-053, § 51-11R-40340, filed 11/25/14, effective 5/1/15. Statutory Authority: RCW 19.27A.025, 19.27A.045, and 19.27.074. WSR 13-20-121, § 51-11R-40340, filed 10/1/13, effective 11/1/13. Statutory Authority: RCW 19.27A.020, 19.27A.045 and chapters 19.27 and 34.05 RCW. WSR 13-04-055, § 51-11R-40340, filed 2/1/13, effective 7/1/13.

Wash. Admin. Code § 51-11R-40350 Section R403.6—Mechanical ventilation.

R403.6 Mechanical ventilation. The buildings complying with Section R402.4.1 shall be provided with mechanical ventilation that meets the requirements of Section M1505 in the International Residential Code or Section 403 in the International Mechanical Code, as applicable, or with other approved means of ventilation. Outdoor air intakes and exhausts shall have automatic or gravity dampers that close when the ventilation system is not operating.

R403.6.1 Whole-house mechanical ventilation system fan efficacy. Mechanical ventilation system fans shall meet the efficacy requirements of Table R403.6.1 at one or more rating points. Fans shall be tested in accordance with HVI 916 and listed. The airflow shall be reported in the product listing or on the label. Fan efficacy shall be reported in the product listing or shall be derived from the input power and airflow values reported in the product listing on the label. Fan efficacy for fully ducted HRV, ERV, balanced, and in-line fans shall be determined at a static pressure of not less than 0.2 inch w.c. (49.85 Pa). Fan efficacy for ducted range hoods, bathroom and utility room fans shall be determined at a static pressure of not less than 0.1 inch w.c. (24.91 Pa).

R403.6.2 Testing. Mechanical ventilation systems shall be tested and verified to provide the minimum ventilation flow rates required by Section R403.6. Testing shall be performed according to the ventilation equipment manufacturer's instructions, or by using a flow hood or box, flow grid, or other airflow measuring device at the mechanical ventilation fan's inlet terminals or grilles, outlet terminals or grilles, or in the connected ventilation ducts. Where required by the code official, testing shall be conducted by an approved third party. A written report of the results of the test shall be signed by the party conducting the test and provided to the code official.

| EXCEPTION: | Kitchen range hoods that are ducted to the outside with 6-inch (152 mm) or larger duct and not more than one 90-degree (1.57 rad) elbow or equivalent in the duct run. | | --- | --- |

History

• Statutory Authority: RCW 19.27A.020, 19.27A.045, 19.27A.160, and chapter 19.27A RCW. WSR 23-02-060, 23-12-102, and 23-20-022, § 51-11R-40350, filed 1/3/23, 6/7/23, and 9/25/23, effective 3/15/24. Statutory Authority: RCW 19.27A.020, 19.27A.045, 19.27A.160 and chapter 19.27 RCW. WSR 20-01-047, § 51-11R-40350, filed 12/9/19, effective 7/1/20. Statutory Authority: RCW 19.27A.020, 19.27A.045, 19.27A.160, and 19.27.074. WSR 16-02-127, § 51-11R-40350, filed 1/6/16, effective 7/1/16. Statutory Authority: RCW 19.27A.020, 19.27A.045 and chapters 19.27 and 34.05 RCW. WSR 13-04-055, § 51-11R-40350, filed 2/1/13, effective 7/1/13.

Wash. Admin. Code § 51-11R-40351 Table R403.6.1—Mechanical ventilation system fan efficacy.

TABLE R403.6.1

WHOLE HOUSE MECHANICAL VENTILATION SYSTEM FAN EFFICACYa

| System Type | Air Flow Rate (cfm) | Minimum Efficacy (cfm/watt) | | --- | --- | --- | | HRV, ERV or balanced | Any | 1.2 | | Range hoods | Any | 2.8 | | In-line supply or exhaust fan | Any | 3.8 | | Other exhaust fan | <90 | 2.8 | | Other exhaust fan | ≥90 | 3.5 |

| For SI: 1 cfm = 28.3 L/min. | | --- | | a. Design outdoor or exhausted airflow rates/watt of fan used. |

History

• Statutory Authority: RCW 19.27A.020, 19.27A.045, 19.27A.160, and chapter 19.27A RCW. WSR 23-02-060, 23-12-102, and 23-20-022, § 51-11R-40351, filed 1/3/23, 6/7/23, and 9/25/23, effective 3/15/24. Statutory Authority: RCW 19.27A.045 and chapter 19.27A RCW. WSR 20-21-081, § 51-11R-40351, filed 10/19/20, effective 2/1/21. Statutory Authority: RCW 19.27A.020, 19.27A.045, 19.27A.160 and chapter 19.27 RCW. WSR 20-01-047, § 51-11R-40351, filed 12/9/19, effective 7/1/20. Statutory Authority: RCW 19.27A.020, 19.27A.045, 19.27A.160, and 19.27.074. WSR 16-02-127, § 51-11R-40351, filed 1/6/16, effective 7/1/16. Statutory Authority: RCW 19.27A.020, 19.27A.045 and chapters 19.27 and 34.05 RCW. WSR 13-04-055, § 51-11R-40351, filed 2/1/13, effective 7/1/13.

Wash. Admin. Code § 51-11R-40360 Section R403.7—Equipment sizing.

R403.7 Equipment sizing and efficiency rating. Heating and cooling equipment shall be sized in accordance with ACCA Manual S based on building loads calculated in accordance with ACCA Manual J or other approved heating and cooling calculation methodologies. The output capacity of heating and cooling equipment shall not be greater than that of the smallest available equipment size that exceeds the loads calculated, including allowable oversizing limits. Equipment shall meet the minimum federal efficiency standards as referenced in Tables C403.3.2(1), C403.3.2(2), C403.3.2(3), C403.3.2(4), C403.3.2(5), C403.3.2(6), C403.3.2(7), C403.3.2(8) and C403.3.2(9) and tested and rated in accordance with the applicable test procedure.

R403.7.1 Gas fireplace efficiency. All vented gas fireplace heaters rated to ANSI Z21.88 shall be listed and labeled with a fireplace efficiency (FE) rating of 50 percent or greater in accordance with CSA P.4.1. Vented gas fireplaces (decorative appliances) certified to ANSI Z21.50 shall be listed and labeled, including their FE ratings, in accordance with CSA P.4.1.

History

• Statutory Authority: RCW 19.27A.020, 19.27A.045, 19.27A.160, and chapter 19.27A RCW. WSR 23-02-060, 23-12-102, and 23-20-022, § 51-11R-40360, filed 1/3/23, 6/7/23, and 9/25/23, effective 3/15/24. Statutory Authority: RCW 19.27A.045 and chapter 19.27A RCW. WSR 20-21-081, § 51-11R-40360, filed 10/19/20, effective 2/1/21. Statutory Authority: RCW 19.27A.020, 19.27A.045, 19.27A.160 and chapter 19.27 RCW. WSR 20-01-047, § 51-11R-40360, filed 12/9/19, effective 7/1/20. Statutory Authority: RCW 19.27A.020, 19.27A.045, 19.27A.160, and 19.27.074. WSR 16-02-127, § 51-11R-40360, filed 1/6/16, effective 7/1/16. Statutory Authority: RCW 19.27A.020, 19.27A.045 and chapters 19.27 and 34.05 RCW. WSR 13-04-055, § 51-11R-40360, filed 2/1/13, effective 7/1/13.

Wash. Admin. Code § 51-11R-40370 Section R403.8—Systems serving multiple dwelling units.

R403.8 Systems serving multiple dwelling units. Systems serving multiple dwelling units shall comply with Sections C403 and C404 of the WSEC—Commercial Provisions in lieu of Section R403.

History

• Statutory Authority: RCW 19.27A.020, 19.27A.045, 19.27A.160 and chapter 19.27 RCW. WSR 20-01-047, § 51-11R-40370, filed 12/9/19, effective 7/1/20. Statutory Authority: RCW 19.27A.020, 19.27A.045, 19.27A.160, and 19.27.074. WSR 16-02-127, § 51-11R-40370, filed 1/6/16, effective 7/1/16. Statutory Authority: RCW 19.27A.020, 19.27A.045 and chapters 19.27 and 34.05 RCW. WSR 13-04-055, § 51-11R-40370, filed 2/1/13, effective 7/1/13.

Wash. Admin. Code § 51-11R-40380 Section R403.9—Snow melt system controls.

R403.9 Snow melt system controls. Snow and ice-melting systems, supplied through energy service to the building, shall include automatic controls capable of shutting off the system when the pavement temperature is above 50°F, and no precipitation is falling and an automatic or manual control that will allow shutoff when the outdoor temperature is above 40°F.

History

• Statutory Authority: RCW 19.27A.020, 19.27A.045, 19.27A.160 and Chapter 19.27 RCW. WSR 20-01-047, § 51-11R-40380, filed 12/9/19, effective 7/1/20. Statutory Authority: RCW 19.27A.020, 19.27A.045, 19.27A.160, and 19.27.074. WSR 16-02-127, § 51-11R-40380, filed 1/6/16, effective 7/1/16. Statutory Authority: RCW 19.27A.020, 19.27A.045 and chapters 19.27 and 34.05 RCW. WSR 13-04-055, § 51-11R-40380, filed 2/1/13, effective 7/1/13.

Wash. Admin. Code § 51-11R-40390 Section R403.10—Pool and spa energy consumption.

R403.10 Energy consumption of pools and spas. The energy consumption of pools and permanent spas shall be controlled by the requirements in Sections R403.10.1 through R403.10.4.2.

R403.10.1 Heaters. The electric power to heaters shall be controlled by an on-off switch that is an integral part of the heater mounted on the exterior of the heater in a location with ready access, or external to and within 3 feet (914 mm) of the heater. Operation of such switch shall not change the settings of the heater thermostat. Such switches shall be in addition to a circuit breaker for the power to the heater.

R403.10.2 Time switches. Time switches or other control method that can automatically turn off and on heaters and pump motors according to a preset schedule shall be installed for heaters and pump motors. Heaters and pump motors that have built in time switches shall be deemed in compliance with this requirement.

| EXCEPTIONS: | 1. Where public health standards require 24-hour pump operation. | | --- | --- | | | 2. Pumps that operate solar- and waste-heat-recovery pool heating systems. |

R403.10.3 Covers. Outdoor heated pools and outdoor permanent spas shall be provided with a vapor-retardant cover, or other approved vapor retardant means.

| EXCEPTION: | Where more than 75 percent of the energy for heating, computed over an operating season of not fewer than three calendar months, is from a heat pump or on-site renewable energy system, covers or other vapor-retardant means shall not be required. | | --- | --- |

R403.10.4 Residential pool pumps. Pool pump motors may not be split-phase or capacitor start-induction run type.

R403.10.4.1 Two-speed capability.

1. Pump motors: Pool pump motors with a capacity of 1 hp or more shall have the capability of operating at two or more speeds with low speed having a rotation rate that is no more than one-half of the motor's maximum rotation rate.

2. Pump controls: Pool pump motor controls shall have the capability of operating the pool pump with at least two speeds. The default circulation speed shall be the lowest speed, with a high speed override capability being for a temporary period not to exceed one normal cycle.

R403.10.4.2 Pump operation. Circulating water systems shall be controlled so that the circulation pump(s) can be conveniently turned off, automatically or manually, when the water system is not in operation.

History

• Statutory Authority: RCW 19.27A.020, 19.27A.045, 19.27A.160, and chapter 19.27A RCW. WSR 23-02-060, 23-12-102, and 23-20-022, § 51-11R-40390, filed 1/3/23, 6/7/23, and 9/25/23, effective 3/15/24. Statutory Authority: RCW 19.27A.020, 19.27A.045, 19.27A.160 and chapter 19.27 RCW. WSR 20-01-047, § 51-11R-40390, filed 12/9/19, effective 7/1/20. Statutory Authority: RCW 19.27A.020, 19.27A.045, 19.27A.160, and 19.27.074. WSR 16-02-127, § 51-11R-40390, filed 1/6/16, effective 7/1/16. Statutory Authority: RCW 19.27A.020, 19.27A.045 and chapters 19.27 and 34.05 RCW. WSR 13-04-055, § 51-11R-40390, filed 2/1/13, effective 7/1/13.

Wash. Admin. Code § 51-11R-40391 Section R403.10—Other pools and spas.

R403.11 Portable spas. The energy consumption of electric-powered portable spas shall be controlled by the requirements of APSP-14.

R403.12 Residential pools and permanent residential spas. The energy consumption of residential swimming pools and permanent residential spas shall be controlled in accordance with the requirements of APSP-15.

History

• Statutory Authority: RCW 19.27A.020, 19.27A.045, 19.27A.160, and chapter 19.27A RCW. WSR 23-02-060, 23-12-102, and 23-20-022, § 51-11R-40391, filed 1/3/23, 6/7/23, and 9/25/23, effective 3/15/24. Statutory Authority: RCW 19.27A.020, 19.27A.045, 19.27A.160 and chapter 19.27 RCW. WSR 20-01-047, § 51-11R-40391, filed 12/9/19, effective 7/1/20. Statutory Authority: RCW 19.27A.020, 19.27A.045, 19.27A.160, and 19.27.074. WSR 16-02-127, § 51-11R-40391, filed 1/6/16, effective 7/1/16.

Wash. Admin. Code § 51-11R-40392 Reserved.

History

• Statutory Authority: RCW 19.27A.020, 19.27A.045, 19.27A.160, and chapter 19.27A RCW. WSR 24-03-084, § 51-11R-40392, filed 1/16/24, effective 3/15/24
• WSR 23-02-060, 23-12-102, and 23-20-022, § 51-11R-40392, filed 1/3/23, 6/7/23, and 9/25/23, effective 3/15/24.

Wash. Admin. Code § 51-11R-40400 Section R404—Electrical power and lighting systems.

History

• Statutory Authority: RCW 19.27A.020, 19.27A.045 and chapters 19.27 and 34.05 RCW. WSR 13-04-055, § 51-11R-40400, filed 2/1/13, effective 7/1/13.

Wash. Admin. Code § 51-11R-40410 Section R404.1—Lighting equipment.

R404.1 Lighting equipment. All permanently installed lighting fixtures, excluding kitchen appliance lighting fixtures, shall contain only high-efficacy lighting sources.

R404.1.1 Exterior lighting. Connected exterior lighting for residential buildings shall comply with Section C405.5.

| EXCEPTION: | Solar-powered lamps not connected to any electrical service. | | --- | --- |

R404.1.2 Fuel gas lighting equipment. Fuel gas lighting systems shall not have continuously burning pilot lights.

R404.2 Interior lighting controls. Permanently installed interior lighting fixtures shall be controlled with either a dimmer, an occupant sensor control, or other control that is installed or built into the fixture.

| EXCEPTION: | Lighting controls shall not be required for the following: | | --- | --- | | | 1. Bathrooms; | | | 2. Hallways; | | | 3. Lighting designed for safety or security. |

R404.3 Exterior lighting controls. Where the total permanently installed exterior lighting power is greater than 30 watts, the permanently installed exterior lighting shall comply with the following:

1. Lighting shall be controlled by a manual on and off switch which permits automatic shut-off actions.

| EXCEPTION: | Lighting serving multiple dwelling units. | | --- | --- |

2. Lighting shall be automatically shut off when daylight is present and satisfies the lighting needs.

3. Controls that override automatic shut-off actions shall not be allowed unless the override automatically returns automatic control to its normal operation within 24 hours.

History

• Statutory Authority: RCW 19.27A.020, 19.27A.045, 19.27A.160, and chapter 19.27A RCW. WSR 23-02-060, 23-12-102, and 23-20-022, § 51-11R-40410, filed 1/3/23, 6/7/23, and 9/25/23, effective 3/15/24. Statutory Authority: RCW 19.27A.020, 19.27A.045, 19.27A.160 and chapter 19.27 RCW. WSR 20-01-047, § 51-11R-40410, filed 12/9/19, effective 7/1/20. Statutory Authority: RCW 19.27A.020, 19.27A.045, 19.27A.160, and 19.27.074. WSR 16-02-127, § 51-11R-40410, filed 1/6/16, effective 7/1/16. Statutory Authority: RCW 19.27A.020, 19.27A.045 and chapters 19.27 and 34.05 RCW. WSR 13-04-055, § 51-11R-40410, filed 2/1/13, effective 7/1/13.

Wash. Admin. Code § 51-11R-40500 Section R405—Total building performance.

History

• Statutory Authority: RCW 19.27A.020, 19.27A.045, 19.27A.160, and chapter 19.27A RCW. WSR 23-02-060, 23-12-102, and 23-20-022, § 51-11R-40500, filed 1/3/23, 6/7/23, and 9/25/23, effective 3/15/24. Statutory Authority: RCW 19.27A.020, 19.27A.045 and chapters 19.27 and 34.05 RCW. WSR 13-04-055, § 51-11R-40500, filed 2/1/13, effective 7/1/13.

Wash. Admin. Code § 51-11R-40510 Section R405.1—Scope.

R405.1 Scope. This section establishes criteria for compliance using total building performance analysis. Such analysis shall include heating, cooling, mechanical ventilation, and service water heating energy only.

History

• Statutory Authority: RCW 19.27A.020, 19.27A.045, 19.27A.160, and chapter 19.27A RCW. WSR 23-02-060, 23-12-102, and 23-20-022, § 51-11R-40510, filed 1/3/23, 6/7/23, and 9/25/23, effective 3/15/24. Statutory Authority: RCW 19.27A.020, 19.27A.045, 19.27A.160 and chapter 19.27 RCW. WSR 20-01-047, § 51-11R-40510, filed 12/9/19, effective 7/1/20. Statutory Authority: RCW 19.27A.020, 19.27A.045 and chapters 19.27 and 34.05 RCW. WSR 13-04-055, § 51-11R-40510, filed 2/1/13, effective 7/1/13.

Wash. Admin. Code § 51-11R-40520 Section R405.2—Performance based compliance.

R405.2 Performance based compliance. Compliance based on total building performance requires that a proposed design meet all of the following:

1. The requirements of the sections indicated within Table R405.2.

2. For structures less than 1,500 square feet of conditioned floor area, the annual site energy consumption shall be less than or equal to 64 percent of the annual site energy consumption of the standard reference design.

3. For structures 1,500 to 5,000 square feet of conditioned floor area, the annual site energy consumption shall be no more than 47 percent of the standard reference design.

4. For structures over 5,000 square feet of conditioned floor area, the annual site energy consumption shall be no more than 41 percent of the standard reference design.

5. For structures serving Group R-2 occupancies, the annual site energy consumption shall be less than or equal to 61 percent of the annual site energy consumption of the standard reference design. See Section R401.1 and residential building in Section R202 for Group R-2 scope.

Energy use derived from simulation analysis shall be expressed in Btu per square foot of conditioned floor area per year.

TABLE R405.2

MANDATORY COMPLIANCE MEASURES FOR TOTAL BUILDING PERFORMANCE

| Sectiona | Title | Comments | | --- | --- | --- | | General | | | | R401.3 | Certificate | | | Envelope | | | | R402.1.1 | Vapor retarder | | | R402.2.3 | Eave baffle | | | R402.2.4.1 | Access hatches and doors | | | R402.4 | Air leakage | | | R402.5 | Maximum fenestration U-factor | | | Systems | | | | R403.1 | Controls | | | R403.3 | Ducts | Except for R403.3.2 and R403.3.3 | | R403.4 | Mechanical system piping insulation | | | R403.5.1 | Heated water circulation and temperature maintenance system | | | R403.5.3 | Drain water heat recovery units | | | R403.6 | Mechanical ventilation | | | R403.7 | Equipment sizing and efficiency rating | | | R403.8 | Systems serving multiple dwelling units | | | R403.9 | Snow melt system controls | | | R403.10 | Energy consumption of pools and spas | | | R403.11 | Portable spas | | | R403.12 | Residential pools and permanent residential spas | | | Electrical Power and Lighting | | | | R404.1 | Lighting equipment | | | R404.2 | Interior lighting controls | |

| a | Reference to a code section includes all the relative subsections except as indicated in the table. | | --- | --- |

History

• Statutory Authority: RCW 19.27A.020, 19.27A.045, 19.27A.160, and chapter 19.27A RCW. WSR 24-03-084, § 51-11R-40520, filed 1/16/24, effective 3/15/24
• WSR 23-02-060, 23-12-102, and 23-20-022, § 51-11R-40520, filed 1/3/23, 6/7/23, and 9/25/23, effective 3/15/24. Statutory Authority: RCW 19.27A.045 and chapter 19.27A RCW. WSR 22-10-094, § 51-11R-40520, filed 5/3/22, effective 6/3/22. Statutory Authority: RCW 19.27A.020, 19.27A.045, 19.27A.160 and chapter 19.27 RCW. WSR 20-01-047, § 51-11R-40520, filed 12/9/19, effective 7/1/20. Statutory Authority: RCW 19.27A.020, 19.27A.045 and chapters 19.27 and 34.05 RCW. WSR 13-04-055, § 51-11R-40520, filed 2/1/13, effective 7/1/13.

Wash. Admin. Code § 51-11R-40530 Section R405.3—Documentation.

R405.3 Documentation. Documentation of the software used for the performance design and the parameters for the building shall be in accordance with Sections R405.3.1 through R405.3.2.2.

R405.3.1 Compliance software tools. Documentation verifying that the methods and accuracy of the compliance software tools conform to the provisions of this section shall be provided to the code official.

R405.3.2 Compliance report. Compliance software tools shall generate a report that documents that the proposed design complies with Section R405.2.

A compliance report on the proposed design shall be submitted with the application for the building permit. Upon completion of the building, a confirmed compliance report based upon the confirmed condition of the building shall be submitted to the code official before a certificate of occupancy is issued.

Compliance reports shall include information in accordance with Sections R405.3.2.1 and R405.3.2.2.

R405.3.2.1 Compliance report for permit application. A compliance report submitted with the application for building permit shall include all of the following:

1. Building street address, or other building site identification.

2. The name, organization, and contact information of the individual performing the analysis and generating the compliance report.

3. The name and version of the compliance software tool.

4. Documentation of all inputs entered into the software used to produce the results for the reference design and/or the rated home.

5. A certificate indicating that the proposed design complied with Section R405.2. The certificate shall document the building components' energy specifications that are included in the calculation including: Component-level insulation R-values or U-factors; duct system and building envelope air leakage testing assumptions; and the type and rated efficiencies of proposed heating, cooling, mechanical ventilation, and service water-heating equipment to be installed. If on-site renewable energy systems will be installed, the certificate shall report the type and production size of the proposed system. Additional documentation reporting estimated annual energy production shall be provided.

6. When a site-specific report is not generated, the proposed design shall be based on the worst-case orientation and configuration of the rated home.

R405.3.2.2 Compliance report for certificate of occupancy. A compliance report submitted for obtaining the certificate of occupancy shall include all of the following:

1. Building street address, or other building site identification.

2. Declaration of the total building performance path on the title page of the energy report and the title page of the building plans.

3. A statement bearing the name of the individual performing the analysis and generating the report, along with their organization and contact information, indicating that the as-build building complies with Section R405.2.

4. The name and version of the compliance software tool.

5. A site-specific energy analysis report that is in compliance with Section R405.2.

6. A final confirmed certificate indicating compliance based on inspection, and a statement indicating that the confirmed rated design of the built home complies with Section R405.2. The certificate shall report the energy features that were confirmed to be in the home, including component level insulation R-values or U-factors; results from any required duct system and building envelope air leakage testing; and the type and rated efficiencies of the heating, cooling, mechanical ventilation, and service water-heating equipment installed.

7. Where on-site renewable energy systems have been installed, the certificate shall report the type and production size of the installed system. Additional documentation reporting estimated annual energy production shall be provided.

History

• Statutory Authority: RCW 19.27A.020, 19.27A.045, 19.27A.160, and chapter 19.27A RCW. WSR 24-03-084, § 51-11R-40530, filed 1/16/24, effective 3/15/24
• WSR 23-02-060, 23-12-102, and 23-20-022, § 51-11R-40530, filed 1/3/23, 6/7/23, and 9/25/23, effective 3/15/24. Statutory Authority: RCW 19.27A.045 and chapter 19.27A RCW. WSR 20-21-081, § 51-11R-40530, filed 10/19/20, effective 2/1/21. Statutory Authority: RCW 19.27A.020, 19.27A.045, 19.27A.160 and chapter 19.27 RCW. WSR 20-01-047, § 51-11R-40530, filed 12/9/19, effective 7/1/20. Statutory Authority: RCW 19.27A.020, 19.27A.045, 19.27A.160, and 19.27.074. WSR 16-02-127, § 51-11R-40530, filed 1/6/16, effective 7/1/16. Statutory Authority: RCW 19.27A.020, 19.27A.045 and chapters 19.27 and 34.05 RCW. WSR 13-04-055, § 51-11R-40530, filed 2/1/13, effective 7/1/13.

Wash. Admin. Code § 51-11R-40540 Section R405.4—Calculation procedure.

R405.4 Calculation procedure. Calculations of the performance design shall be in accordance with Sections R405.4.1 and R405.4.2.

R405.4.1 General. Except as specified by this section, the standard reference design and proposed design shall be configured and analyzed using identical methods and techniques.

R405.4.2 Residence specifications. The standard reference design and proposed design shall be configured and analyzed as specified by Table R405.4.2(1). Table R405.4.2(1) shall include by reference all notes contained in Table R402.1.3.

History

• Statutory Authority: RCW 19.27A.020, 19.27A.045, 19.27A.160, and chapter 19.27A RCW. WSR 23-02-060, 23-12-102, and 23-20-022, § 51-11R-40540, filed 1/3/23, 6/7/23, and 9/25/23, effective 3/15/24. Statutory Authority: RCW 19.27A.020, 19.27A.045, 19.27A.160, and 19.27.074. WSR 16-02-127, § 51-11R-40540, filed 1/6/16, effective 7/1/16. Statutory Authority: RCW 19.27A.020, 19.27A.045 and chapters 19.27 and 34.05 RCW. WSR 13-04-055, § 51-11R-40540, filed 2/1/13, effective 7/1/13.

Wash. Admin. Code § 51-11R-40550 Section R405.5—Calculation procedure.

History

• Statutory Authority: RCW 19.27A.020, 19.27A.045, 19.27A.160, and chapter 19.27A RCW. WSR 23-02-060, 23-12-102, and 23-20-022, § 51-11R-40550, filed 1/3/23, 6/7/23, and 9/25/23, effective 3/15/24. Statutory Authority: RCW 19.27A.020, 19.27A.045 and chapters 19.27 and 34.05 RCW. WSR 13-04-055, § 51-11R-40550, filed 2/1/13, effective 7/1/13.

Wash. Admin. Code § 51-11R-40551 Table R405.4.2(1)—Specifications for the standard reference and proposed designs.

TABLE R405.4.2(1)

SPECIFICATIONS FOR THE STANDARD REFERENCE AND PROPOSED DESIGNS

| BUILDING COMPONENT | STANDARD REFERENCE DESIGN | PROPOSED DESIGN | | --- | --- | --- | | Above-grade walls | Type: Mass wall if proposed wall is mass; otherwise wood frame. Gross area: Same as proposed U-factor: From Table R402.1.2 Solar absorptance = 0.75 Emittance = 0.90 | As proposed As proposed As proposed As proposed As proposed | | Below-grade walls | Type: Same as proposed Gross area: Same as proposed U-factor: From Table R402.1.2, with insulation layer on interior side of walls. | As proposed As proposed As proposed | | Above-grade floors | Type: Wood frame Gross area: Same as proposed U-factor: From Table R402.1.2 | As proposed As proposed As proposed | | Ceilings | Type: Wood frame Gross area: Same as proposed U-factor: From Table R402.1.2 | As proposed As proposed As proposed | | Roofs | Type: Composition shingle on wood sheathing Gross area: Same as proposed Solar absorptance = 0.75 Emittance = 0.90 | As proposed As proposed As proposed As proposed | | Attics | Type: Vented with aperture = 1 ft2 per 300 ft2 ceiling area | As proposed | | Foundations | Type: Same as proposed foundation wall area above and below-grade Soil characteristics: Same as proposed. | As proposed As proposed | | Opaque doors | Area: 40 ft2 Orientation: North U-factor: Same as fenestration from Table R402.1.2. | As proposed As proposed As proposed | | Vertical fenestration other than opaque doorsa | Total areah = (a) The proposed glazing area; where proposed glazing area is less than 15% of the conditioned floor area. (b) 15% of the conditioned floor area; where the proposed glazing area is 15% or more of the conditioned floor area. | As proposed | | | Orientation: Equally distributed to four cardinal compass orientations (N, E, S & W). | As proposed | | | U-factor: From Table R402.1.2 | As proposed | | | SHGC: From Table R402.1.1 except that for climates with no requirement (NR) SHGC = 0.40 shall be used. | As proposed | | | Interior shade fraction: 0.92 - (0.21 × SHGC for the standard reference design) External shading: None | 0.92 - (0.21 × SHGC as proposed) As proposed | | Skylights | None | As proposed | | Air exchange rate | Air leakage rate of 4 air changes per hour at a pressure of 0.2 inches w.g. (50 Pa). The mechanical ventilation rate shall be in addition to the air leakage rate and the same as in the proposed design, but no greater than 0.01 × CFA +7.5 × (Nbr + 1) where: CFA = conditioned floor area Nbr = number of bedrooms - The mechanical ventilation system type shall be the same as in the proposed design. Energy recovery shall not be assumed for mechanical ventilation. | As proposeda. The mechanical ventilation rateb shall be in addition to the air leakage rate and shall be as proposed. | | Mechanical ventilation | None, except where mechanical ventilation is specified by the proposed design, in which case: Annual vent fan energy use: kWh/yr = (1ef) × (0.0876 × CFA + 65.7 × (Nbr + 1) where: ef = the minimum fan efficacy from Table R403.6.1 corresponding to the system type at a flow rate of 0.01 × CFA + 7.5 × (Nbr + 1) CFA = conditioned floor area Nbr = number of bedrooms | As proposed | | Internal gains | IGain = 17,900 + 23.8 × CFA + 4104 × Nbr (Btu/day per dwelling unit) | Same as standard reference design | | Internal mass | An internal mass for furniture and contents of 8 pounds per square foot of floor area. | Same as standard reference design, plus any additional mass specifically designed as a thermal storage elementc but not integral to the building envelope or structure. | | Structural mass | For masonry floor slabs, 80% of floor area covered by R-2 carpet and pad, and 20% of floor directly exposed to room air. | As proposed | | | For masonry basement walls, as proposed, but with insulation required by Table R402.1.2 located on the interior side of the walls. | As proposed | | | For other walls, for ceilings, floors, and interior walls, wood frame construction. | As proposed | | Heating systemsd, e | The standard reference design shall be an air source heat pump meeting the requirements of Section C403 of the WSEC—Commercial Provisions. Capacity: Sized in accordance with Section R403.7 | As proposed | | Cooling systemsd, f | Same system type as proposed. Same system efficiency as required by prevailing minimum federal standard. Capacity: Sized in accordance with Section R403.7 | As proposed | | Service water heatingd, e, f, g | The standard reference design shall be a heat pump water heater meeting the efficiency standards of Table C404.2. Use, in units of gal/day = 25.5 + (8.5 x Nbr) Where Nbr = number of bedrooms | As proposed Use, in units of gal/day = 25.5 + (8.5 x Nbr) x (1 - HWDS) Where: Nbr= number of bedrooms HWDS = factor for the compactness of the hot water distribution system | | Thermal distribution systems | Duct insulation: From Section R403.3.3. Duct location: Same as proposed design. A thermal distribution system efficiency (DSE) of 0.93 shall be applied to both the heating and cooling system efficiencies for all systems. Exception: For nonducted heating and cooling systems that do not have a fan, the standard reference design distribution system efficiency (DSE) shall be 1. | Duct insulation: As proposed. Duct location: As proposed. As specified in Table R405.5.2(2). | | Thermostat | Type: Manual, cooling temperature setpoint = 75°F; Heating temperature setpoint = 72°F | Same as standard reference |

| For SI: | 1 square foot = 0.93 m2, 1 British thermal unit = 1055 J, 1 pound per square foot = 4.88 kg/m2, 1 gallon (U.S.) = 3.785 L, °C = (°F-3)/1.8, 1 degree = 0.79 rad | | --- | --- |

| a | Where required by the code official, testing shall be conducted by an approved party. Hourly calculations as specified in the ASHRAE Handbook of Fundamentals, or the equivalent, shall be used to determine the energy loads resulting from infiltration. | | --- | --- | | b | The combined air exchange rate for infiltration and mechanical ventilation shall be determined in accordance with Equation 43 of 2001 ASHRAE Handbook of Fundamentals, page 26.24 and the "Whole-house Ventilation" provisions of 2001 ASHRAE Handbook of Fundamentals, page 26.19 for intermittent mechanical ventilation. | | c | Thermal storage element shall mean a component not part of the floors, walls or ceilings that is part of a passive solar system, and that provides thermal storage such as enclosed water columns, rock beds, or phase-change containers. A thermal storage element must be in the same room as fenestration that faces within 15 degrees (0.26 rad) of true south, or must be connected to such a room with pipes or ducts that allow the element to be actively charged. | | d | For a proposed design with multiple heating, cooling or water heating systems using different fuel types, the applicable standard reference design system capacities and fuel types shall be weighted in accordance with their respective loads as calculated by accepted engineering practice for each equipment and fuel type present. | | e | For a proposed design without a proposed heating system, a heating system with the prevailing federal minimum efficiency shall be assumed for both the standard reference design and proposed design. | | f | For a proposed design home without a proposed cooling system, an electric air conditioner with the prevailing federal minimum efficiency shall be assumed for both the standard reference design and the proposed design. | | g | For a proposed design with a nonstorage-type water heater, a 40-gallon storage-type water heater with the prevailing federal minimum energy factor for the same fuel as the predominant heating fuel type shall be assumed. For the case of a proposed design without a proposed water heater, a 40-gallon storage-type water heater with the prevailing federal minimum efficiency for the same fuel as the predominant heating fuel type shall be assumed for both the proposed design and standard reference design. | | h | For residences with conditioned basements, R-2 and R-4 residences and townhouses, the following formula shall be used to determine fenestration area: |

| AF = As x FA x F | | | | --- | --- | --- | | Where: | | | | AF | = | Total fenestration area. | | As | = | Standard reference design total fenestration area. | | FA | = | (Above-grade thermal boundary gross wall area)/(above-grade boundary wall area + 0.5 x below-grade boundary wall area). | | F | = | (Above-grade thermal boundary wall area)/(above-grade thermal boundary wall area + common wall area) or 0.56, whichever is greater. | | and where: | | | | Thermal boundary wall is any wall that separates conditioned space from unconditioned space or ambient conditions. | | | | Above-grade thermal boundary wall is any thermal boundary wall component not in contact with soil. | | | | Below-grade boundary wall is any thermal boundary wall in soil contact. | | | | Common wall area is the area of walls shared with an adjoining dwelling unit. | | | | L and CFA are in the same units. | | |

| i | The factor for the compactness of the hot water distribution system is the ratio of the area of the rectangle that bounds the source of hot water and the fixtures that it serves (the "hot water rectangle") divided by the floor area of the dwelling. | | --- | --- | | | 1. Sources of hot water include water heaters, or in multifamily buildings with central water heating systems, circulation loops, or electric heat traced pipes. | | | 2. The hot water rectangle shall include the source of hot water and the points of termination of all hot water fixture supply piping. | | | 3. The hot water rectangle shall be shown on the floor plans and the area shall be computed to the nearest square foot. | | | 4. Where there is more than one water heater and each water heater serves different plumbing fixtures and appliances, it is permissible to establish a separate hot water rectangle for each hot water distribution system and add the area of these rectangles together to determine the compactness ratio. | | | 5. The basement or attic shall be counted as a story when it contains the water heater. | | | 6. Compliance shall be demonstrated by providing a drawing on the plans that shows the hot water distribution system rectangle(s), comparing the area of the rectangle(s) to the area of the dwelling and identifying the appropriate compactness ratio and HWDS factor. |

History

• Statutory Authority: RCW 19.27A.020, 19.27A.045, 19.27A.160, and chapter 19.27A RCW. WSR 24-03-084, § 51-11R-40551, filed 1/16/24, effective 3/15/24
• WSR 23-02-060, 23-12-102, and 23-20-022, § 51-11R-40551, filed 1/3/23, 6/7/23, and 9/25/23, effective 3/15/24. Statutory Authority: RCW 19.27A.045 and chapter 19.27A RCW. WSR 20-21-081, § 51-11R-40551, filed 10/19/20, effective 2/1/21. Statutory Authority: RCW 19.27A.020, 19.27A.045, 19.27A.160 and chapter 19.27 RCW. WSR 20-01-047, § 51-11R-40551, filed 12/9/19, effective 7/1/20. Statutory Authority: RCW 19.27A.020, 19.27A.045, 19.27A.160, and 19.27.074. WSR 16-02-127, § 51-11R-40551, filed 1/6/16, effective 7/1/16. Statutory Authority: RCW 19.27A.020, 19.27A.045 and chapters 19.27 and 34.05 RCW. WSR 13-04-055, § 51-11R-40551, filed 2/1/13, effective 7/1/13.

Wash. Admin. Code § 51-11R-40552 Table R405.4.2(2)—Default distribution system efficiencies for proposed designs.

TABLE R405.4.2(2)

DEFAULT DISTRIBUTION SYSTEM EFFICIENCIES FOR PROPOSED DESIGNSa

| DISTRIBUTION SYSTEM CONFIGURATION AND CONDITION | DISTRIBUTION SYSTEM EFFICIENCY | | --- | --- | | Distribution system components located in unconditioned space | 0.88 | | Distribution systems entirely located in conditioned spaceb | 0.93 | | Zonal systemsc | 1.00 |

| For SI: | 1 cubic foot per minute = 0.47 L/s, 1 square foot = 0.093m2, 1 pound per square inch = 6895 Pa, 1 inch water gauge = 1250 Pa. | | --- | --- | | | a Values given by this table are for distribution systems, which must still meet all prescriptive requirements for duct and pipe system insulation and leakage. | | | b Entire system in conditioned space shall mean that no component of the distribution system, including the air-handler unit, is located outside of the conditioned space. All components must be located on the interior side of the thermal envelope (inside the insulation) and also inside of the air barrier. Refrigerant compressors and piping are allowed to be located outside. | | | c Zonal systems are systems where the heat source is located within each room. Systems shall be allowed to have forced airflow across a coil but shall not have any ducted airflow external to the manufacturer's air-handler enclosure. Hydronic systems do not qualify. |

History

• Statutory Authority: RCW 19.27A.020, 19.27A.045, 19.27A.160, and chapter 19.27A RCW. WSR 24-03-084, § 51-11R-40552, filed 1/16/24, effective 3/15/24
• WSR 23-02-060, 23-12-102, and 23-20-022, § 51-11R-40552, filed 1/3/23, 6/7/23, and 9/25/23, effective 3/15/24. Statutory Authority: RCW 19.27A.020, 19.27A.045, 19.27A.160, and 19.27.074. WSR 16-02-127, § 51-11R-40552, filed 1/6/16, effective 7/1/16. Statutory Authority: RCW 19.27A.020, 19.27A.045 and chapters 19.27 and 34.05 RCW. WSR 13-04-055, § 51-11R-40552, filed 2/1/13, effective 7/1/13.

Wash. Admin. Code § 51-11R-40560 Section R405.5—Calculation software tools.

R405.5 Calculation software tools. Calculation software, where used, shall be in accordance with Sections R405.5.1 through R405.5.3.

R405.5.1 Minimum capabilities. Calculation procedures used to comply with this section shall be software tools capable of calculating the annual energy consumption of all building elements that differ between the standard reference design and the proposed design and shall include the following capabilities:

1. Calculation of whole-building (as a single zone) sizing for the heating and cooling equipment in the standard reference design residence in accordance with Section R403.6.

2. Calculations that account for the effects of indoor and outdoor temperatures and part-load ratios on the performance of heating, ventilating and air-conditioning equipment based on climate and equipment sizing.

3. Printed code official inspection checklist listing each of the proposed design component characteristics from Table R405.4.2(1) determined by the analysis to provide compliance, along with their respective performance ratings (e.g., R-value, U-factor, SHGC, HSPF, AFUE, SEER, EF, etc.).

R405.5.2 Specific approval. Performance analysis tools meeting the applicable sections of Section R405 shall be permitted to be approved. Tools are permitted to be approved based on meeting a specified threshold for a jurisdiction. The code official shall be permitted to approve tools for a specified application or limited scope.

R405.5.3 Input values. When calculations require input values not specified by Sections R402, R403, R404 and R405, those input values shall be taken from an approved source.

History

• Statutory Authority: RCW 19.27A.020, 19.27A.045, 19.27A.160, and chapter 19.27A RCW. WSR 24-03-084, § 51-11R-40560, filed 1/16/24, effective 3/15/24
• WSR 23-02-060, 23-12-102, and 23-20-022, § 51-11R-40560, filed 1/3/23, 6/7/23, and 9/25/23, effective 3/15/24. Statutory Authority: RCW 19.27A.020, 19.27A.045 and chapters 19.27 and 34.05 RCW. WSR 13-04-055, § 51-11R-40560, filed 2/1/13, effective 7/1/13.

Wash. Admin. Code § 51-11R-40600 Section R406—Additional energy efficiency requirements.

History

• Statutory Authority: RCW 19.27A.020, 19.27A.045 and chapters 19.27 and 34.05 RCW. WSR 13-04-055, § 51-11R-40600, filed 2/1/13, effective 7/1/13.

Wash. Admin. Code § 51-11R-40610 Section R406.1—Scope.

R406.1 Scope. This section establishes additional energy efficiency requirements for all new construction covered by this code, including additions subject to Section R502 and change of occupancy or use subject to Section R505 unless specifically exempted in Section R406. Credits from both Sections R406.2 and R406.3 are required.

R406.2 Carbon emission equalization. This section establishes a base equalization between fuels used to define the equivalent carbon emissions of the options specified. The permit shall define the base fuel selection to be used and the points specified in Table R406.2 shall be used to modify the requirements in Section R406.3.

TABLE R406.2

ENERGY EQUALIZATION CREDITS

| System Type | Description of Heating Sources | Credits | | | --- | --- | --- | --- | | All Other | Group R-2a | | | | 1 | For combustion heating system using equipment meeting minimum federal efficiency standards for the equipment listed in Table C403.3.2(5) or C403.3.2(6) | 0 | 0 | | 2 | For an initial heating system using a heat pump that meets federal standards for the equipment listed in Table C403.3.2(2) and supplemental heating provided by electric resistance or a combustion furnace meeting minimum standards listed in Table C403.3.2(5)b | 1.5 | 0 | | 3 | For heating system based on electric resistance only (either forced air or zonal) | 0.5 | -0.5 | | 4c | For a heating system using a heat pump that meets federal standards for the equipment listed in Table C403.3.2(2) or C403.3.2(9) or Air to water heat pump units that are configured to provide both heating and cooling and are rated in accordance with AHRI 550/590 | 3.0 | 2.0 | | 5 | For heating system based on electric resistance with: 1. Inverter-driven ductless mini-split heat pump system installed in the largest zone in the dwelling or 2. With 2 kW or less total installed heating capacity per dwelling | 2.0 | 0 |

| a | See Section R401.1 and residential building in Section R202 for Group R-2 scope. | | --- | --- | | b | The gas back-up furnace will operate as fan-only when the heat pump is operating. The heat pump shall operate at all temperatures above 38°F (3.3°C) (or lower). Below that "changeover" temperature, the heat pump would not operate to provide space heating. The gas furnace provides heating below 38°F (3.3°C) (or lower). | | c | Additional points for this HVAC system are included in Table R406.3. |

History

• Statutory Authority: RCW 19.27A.020, 19.27A.045, 19.27A.160, and chapter 19.27A RCW. WSR 24-03-084, § 51-11R-40610, filed 1/16/24, effective 3/15/24
• WSR 23-02-060, 23-12-102, and 23-20-022, § 51-11R-40610, filed 1/3/23, 6/7/23, and 9/25/23, effective 3/15/24. Statutory Authority: RCW 19.27A.020, 19.27A.045, 19.27A.160 and chapter 19.27 RCW. WSR 20-01-047, § 51-11R-40610, filed 12/9/19, effective 7/1/20. Statutory Authority: RCW 19.27A.025, 19.27A.045, 19.27A.160, and 19.27.074. WSR 17-10-063, § 51-11R-40610, filed 5/2/17, effective 6/2/17. Statutory Authority: RCW 19.27A.020, 19.27A.045 and chapters 19.27 and 34.05 RCW. WSR 13-04-055, § 51-11R-40610, filed 2/1/13, effective 7/1/13.

Wash. Admin. Code § 51-11R-40620 Section R406.3—Additional energy efficiency requirements.

R406.3 Additional energy efficiency requirements. Each dwelling unit in a residential building shall comply with sufficient options from Table R406.2 and R406.3 so as to achieve the following minimum number of credits:

| 1. | Small Dwelling Unit: | 5.0 credits | | | --- | --- | --- | --- | | | Dwelling units less than 1500 square feet in conditioned floor area with less than 300 square feet of fenestration area. Additions to existing building that are greater than 500 square feet of heated floor area but less than 1500 square feet. | | | | 2. | Medium Dwelling Unit: | 8.0 credits | | | | All dwelling units that are not included in #1, #3, or #4. | | | | 3. | Large Dwelling Unit: | 9.0 credits | | | | Dwelling units exceeding 5000 square feet of conditioned floor area. | | | | 4. | Dwelling units serving Group R-2 occupancies. See Section R401.1 and residential building in Section R202 for Group R-2 scope. | 6.5 credits | | | 5. | Additions 150 square feet to 500 square feet: | 2.0 credits | |

The drawings included with the building permit application shall identify which options have been selected and the point value of each option, regardless of whether separate mechanical, plumbing, electrical, or other permits are utilized for the project.

History

• Statutory Authority: RCW 19.27A.020, 19.27A.045, 19.27A.160, and chapter 19.27A RCW. WSR 24-03-084, § 51-11R-40620, filed 1/16/24, effective 3/15/24
• WSR 23-02-060, 23-12-102, and 23-20-022, § 51-11R-40620, filed 1/3/23, 6/7/23, and 9/25/23, effective 3/15/24. Statutory Authority: RCW 19.27A.020, 19.27A.045, 19.27A.160 and chapter 19.27 RCW. WSR 20-01-047, § 51-11R-40620, filed 12/9/19, effective 7/1/20. Statutory Authority: RCW 19.27A.020, 19.27A.045, 19.27A.160, and 19.27.074. WSR 16-02-127, § 51-11R-40620, filed 1/6/16, effective 7/1/16. Statutory Authority: RCW 19.27A.020, 19.27A.045 and chapters 19.27 and 34.05 RCW. WSR 13-04-055, § 51-11R-40620, filed 2/1/13, effective 7/1/13.

Wash. Admin. Code § 51-11R-40621 Table R406.3—Energy credits.

TABLE 406.3

ENERGY CREDITS

| OPTION | DESCRIPTION | CREDIT(S) | | | --- | --- | --- | --- | | All Other | Group R-2b | | | | 1. EFFICIENT BUILDING ENVELOPE OPTIONS Only one option from Items 1.1 through 1.4 may be selected in this category. Compliance with the conductive UA targets is demonstrated using Section R402.1.5, Total UA alternative, where [1-(Proposed UA/Target UA)] ˃; the required %UA reduction | | | | | 1.1 | Prescriptive compliance is based on Table R402.1.3 with the following modifications: Vertical fenestration U = 0.22. | 0.5 | 0.5 | | 1.2 | Prescriptive compliance is based on Table R402.1.3 with the following modifications: Vertical fenestration U = 0.25 Floor R-38 Basement wall R-21 int plus R-5 ci Ceiling and single-rafter or joist-vaulted R-60 advanced Slab on grade R-10 perimeter and under entire slab Below grade slab R-10 perimeter and under entire slab or Compliance based on Section R402.1.5: Reduce the Total conductive UA by 15%. | 1.0 | 1.0 | | 1.3 | Prescriptive compliance is based on Table R402.1.3 with the following modifications: Vertical fenestration U = 0.18 Ceiling and single-rafter or joist-vaulted R-60 advanced Floor R-38 Basement wall R-21 int plus R-12 ci Slab on grade R-10 perimeter and under entire slab Below grade slab R-10 perimeter and under entire slab or Compliance based on Section R402.1.5: Reduce the Total conductive UA by 22.5%. | 1.5 | 1.5 | | 1.4 | Prescriptive compliance is based on Table R402.1.3 with the following modifications: Vertical fenestration U = 0.18 Ceiling and single-rafter or joist-vaulted R-60 advanced Wood frame wall R-21 int plus R-16 ci Floor R-48 Basement wall R-21 int plus R-16 ci Slab on grade R-20 perimeter and under entire slab Below grade slab R-20 perimeter and under entire slab or Compliance based on Section R402.1.5: Reduce the Total conductive UA by 30%. | 2.5 | 2.0 | | 2. AIR LEAKAGE CONTROL AND EFFICIENT VENTILATION OPTIONS Only one option from Items 2.1 through 2.3 may be selected in this category. | | | | | 2.1 | Compliance based on Section R402.4.1.2: Reduce the tested air leakage to 2.0 air changes per hour maximum at 50 Pascals or For R-2 Occupancies, optional compliance based on Section R402.4.1.2: Reduce the tested air leakage to 0.25 cfm/ft2 maximum at 50 Pascals and All whole house ventilation requirements as determined by Section M1505.3 of the International Residential Code or Section 403.8 of the International Mechanical Code shall be met with a heat recovery ventilation system with minimum sensible heat recovery efficiency of 0.65. To qualify to claim this credit, the building permit drawings shall specify the option being selected and shall specify the maximum tested building air leakage and shall show the heat recovery ventilation system. | 1.0 | 1.0 | | 2.2 | Compliance based on Section R402.4.1.2: Reduce the tested air leakage to 1.5 air changes per hour maximum at 50 Pascals or For R-2 Occupancies, optional compliance based on Section R402.4.1.2: Reduce the tested air leakage to 0.20 cfm/ft2 maximum at 50 Pascals and All whole house ventilation requirements as determined by Section M1505.3 of the International Residential Code or Section 403.8 of the International Mechanical Code shall be met with a heat recovery ventilation system with minimum sensible heat recovery efficiency of 0.75. To qualify to claim this credit, the building permit drawings shall specify the option being selected and shall specify the maximum tested building air leakage and shall show the heat recovery ventilation system. | 1.5 | 1.5 | | 2.3 | Compliance based on Section R402.4.1.2: Reduce the tested air leakage to 0.6 air changes per hour maximum at 50 Pascals or For R-2 Occupancies, optional compliance based on Section R402.4.1.2: Reduce the tested air leakage to 0.15 cfm/ft2 maximum at 50 Pascals and All whole house ventilation requirements as determined by Section M1505.3 of the International Residential Code or Section 403.8 of the International Mechanical Code shall be met with a heat recovery ventilation system with minimum sensible heat recovery efficiency of 0.80. Duct installation shall comply with Section R403.3.2. To qualify to claim this credit, the building permit drawings shall specify the option being selected and shall specify the maximum tested building air leakage and shall show the heat recovery ventilation system. | 2.0 | 2.0 | | 3. HIGH EFFICIENCY HVAC EQUIPMENT OPTIONS Only one option from Items 3.1 through 3.10 may be selected in this category. Item 3.11 may be taken with Items 3.1 or 3.3c only. | | | | | 3.1a | For a System Type 1 in Table R406.2: Energy Star rated (U.S. North) gas or propane furnace with minimum AFUE of 95%. or Energy Star rated (U.S. North) gas or propane boiler with minimum AFUE of 90% To qualify to claim this credit, the building permit drawings shall specify the option being selected and shall specify the heating equipment type and the minimum equipment efficiency. | 1.0 | 1.0 | | 3.2a | For secondary heating system serving System Type 2 in Table R406.2: Energy Star rated (U.S. North) Gas or propane furnace with minimum AFUE of 95% or Energy Star rated (U.S. North) Gas or propane boiler with minimum AFUE of 90%. To qualify to claim this credit, the building permit drawings shall specify the option being selected and shall specify the heating equipment type and the minimum equipment efficiency. | 0.5 | 0.5 | | 3.3a,c,d | Air-source centrally ducted heat pump with minimum HSPF2 of 8.1 (HSPF of 9.5). In areas where the winter design temperature as specified in Appendix RC is 23°F or below, a cold climate heat pump found on the NEEP cc ASHP qualified product list shall be used. To qualify to claim this credit, the building permit drawings shall specify the option being selected and shall specify the heating equipment type and the minimum equipment efficiency. | 0.5 | N/A | | 3.4a,d | Closed-loop ground source heat pump; with a minimum COP of 3.3 or Open loop water source heat pump with a maximum pumping hydraulic head of 150 feet and minimum COP of 3.6. To qualify to claim this credit, the building permit drawings shall specify the option being selected and shall specify the heating equipment type and the minimum equipment efficiency. | 1.5 | 1.0 | | 3.5d | Ductless mini-split heat pump system, zonal control: In homes where the primary space heating system is zonal electric heating, a ductless mini-split heat pump system with a minimum HSPF2 of 9 (HSPF of 10.0) shall be installed and provide heating to the largest zone of the housing unit. To qualify to claim this credit, the building permit drawings shall specify the option being selected and shall specify the heating equipment type and the minimum equipment efficiency. | 1.5 | 2.0 | | 3.6a,d | Air-source, centrally ducted heat pump with minimum HSPF2 of 9.4 (HSPF of 11.0). A centrally ducted air source cold climate variable capacity heat pump (cc VCHP) found on the NEEP cc VCHP qualified product list with a minimum of 9 HSPF2 (10 HSPF) may be used to satisfy this requirement. In areas where the winter design temperature as specified in Appendix RC is 23°F or below, an air source centrally ducted heat pump shall be a cold climate variable capacity heat pump as listed on the NEEP qualified product list. To qualify to claim this credit, the building permit drawings shall specify the option being selected and shall specify the heating equipment type and the minimum equipment efficiency. | 1.0 | N/A | | 3.7a,d,e | Ductless split system heat pumps with no electric resistance heating in the primary living areas. A ductless heat pump system with a minimum HSPF2 of 9 (HSPF of 10) shall be sized and installed to provide heat to entire dwelling unit at the design outdoor air temperature. Exception: In homes with total heating loads of 24,000 or less using multi-zone mini-split systems with nominal ratings of 24,000 or less, the minimum HSPF2 to claim this credit shall be 8.1 (9 HSPF). To qualify to claim this credit, the building permit drawings shall specify the option being selected, the heated floor area calculation, the heating equipment type(s), the minimum equipment efficiency, and total installed heat capacity (by equipment type). | 2.0 | 3.0 | | 3.8a,d | Air-to-water heat pump with minimum COP of 3.2 at 47°F, rated in accordance with AHRI 550/590 by an accredited or certified testing lab. To qualify to claim this credit, the building permit drawings shall specify the option being selected, the heated floor area calculation, the heating equipment type(s), the minimum equipment efficiency, and total installed heat capacity (by equipment type). | 1.0 | N/A | | 3.9 | Gas-fired heat pump(s) meeting ANSI Z21.40.2 and Z21.40.4 or CSA, with a minimum UEF of 1.15. For R-2 Occupancy, gas-fired heat pump(s) meeting ANSI Z21.40.2 and Z21.40.4 or CSA, with a minimum UEF of 1.15, shall serve all units. | 1.5 | 1.5 | | 3.l0f | Combination water heating and space heating system shall include one of the following: Gas-fired heat pump water heater(s) meeting Tier 2 of the NEEA Advanced Water Heating Specification for Gas-Fueled Residential Storage Water Heaters Version 1.0. or For R-2 Occupancy, gas-fired heat pump water heater(s) meeting Tier 2 of the NEEA Advanced Water Heating Specification for Gas-Fueled Residential Storage Water Heaters Version 1.0., shall serve all units. or For R-2 Occupancy, gas-fired heat pump(s) meeting ANSI Z21.40.2 and Z21.40.4 or CSA, with a minimum UEF of 1.15, shall serve all units. To qualify to claim this credit, the building permit drawings shall specify the option being selected and shall specify the water heater equipment type and the minimum equipment efficiency and, for solar water heating systems, the calculation of the minimum energy savings. | 2.5 | 2.5 | | 3.11c | Connected thermostat meeting ENERGY STAR Certified Smart Thermostats/EPA ENERGY STAR specifications. To qualify to claim this credit, the building permit drawings shall specify the option being selected and shall specify the thermostat model. | 0.5 | 0.5 | | 4. HIGH EFFICIENCY HVAC DISTRIBUTION SYSTEM OPTIONS | | | | | 4.1 | HVAC equipment and associated duct system(s) installation shall comply with the requirements of Section R403.3.2. Electric resistance heat, hydronic heating and ductless heat pumps are not permitted under this option. To qualify to claim this credit, the building permit drawings shall specify the option being selected and shall specify the heating equipment type and shall show the location of the heating and cooling equipment and all the ductwork. | 0.5 | N/A | | 5. EFFICIENT WATER HEATING OPTIONS Only one option from Items 5.3 through 5.8 may be selected in this category. Items 5.1 and 5.2 may be combined with any option. | | | | | 5.1 | A drain water heat recovery unit(s) shall be installed, which captures wastewater heat from at least two showers, including tub/shower combinations. It is acceptable, but not required, for sink water to be connected. Unit shall have a minimum efficiency of 40% if installed for equal flow or a minimum efficiency of 54% if installed for unequal flow. Such units shall be rated in accordance with CSA B55.1 or IAPMO IGC 346-2017 and be so labeled. To qualify to claim this credit, the building permit drawings shall include a plumbing diagram that specifies the drain water heat recovery units and the plumbing layout needed to install it. Labels or other documentation shall be provided that demonstrates that the unit complies with the standard. | 0.5 | 0.5 | | 5.2 | For Compact Hot Water Distribution system credit, the volume shall store not more than 16 ounces of water between the nearest source of heated water and the termination of the fixture supply pipe where calculated using Section R403.5.2. Construction documents shall indicate the ounces of water in piping between the hot water source and the termination of the fixture supply. When the hot water source is the nearest primed plumbing loop or trunk, this must be primed with an On Demand recirculation pump and must run a dedicated ambient return line from the furthest fixture or end of loop to the water heater. To qualify for this credit, the dwelling must have a minimum of 1.5 bathrooms. | 0.5 | 0.5 | | 5.3 | Water heating system shall include the following: Energy Star rated gas or propane water heater with a minimum UEF of 0.80. To qualify to claim this credit, the building permit drawings shall specify the option being selected and shall specify the water heater equipment type and the minimum equipment efficiency. | 0.5 | 0.5 | | 5.4 | Water heating system shall include one of the following: Energy Star rated gas or propane water heater with a minimum UEF of 0.91. or Solar water heating supplementing a minimum standard water heater. Solar water heating will provide a rated minimum savings of 85 therms or 2000 kWh based on the Solar Rating and Certification Corporation (SRCC) Annual Performance of OG-300 Certified Solar Water Heating Systems or Water heater heated by ground source heat pump meeting the requirements of Option 3.4. To qualify to claim this credit, the building permit drawings shall specify the option being selected and shall specify the water heater equipment type and the minimum equipment efficiency and, for solar water heating systems, the calculation of the minimum energy savings. | 1.0 | 1.0 | | 5.5 | Water heating system shall include one of the following: Gas-fired heat pump water heater(s) meeting Tier 2 of the NEEA Advanced Water Heating Specification for Gas-Fueled Residential Storage Water Heaters Version 1.0. or For R-2 Occupancy, gas-fired heat pump water heater(s) meeting Tier 2 of the NEEA Advanced Water Heating Specification for Gas-Fueled Residential Storage Water Heaters Version 1.0. shall supply domestic hot water to all units. or For R-2 Occupancy, gas-fired heat pump water heater(s) meeting ANSI Z21.40.2 and Z21.40.4 or CSA, with a minimum UEF of 1.15, shall supply domestic hot water to all units. To qualify to claim this credit, the building permit drawings shall specify the option being selected and shall specify the water heater equipment type and the minimum equipment efficiency and, for solar water heating systems, the calculation of the minimum energy savings. | 1.5 | 1.5 | | 5.6 | Water heating system shall include one of the following: Electric heat pump water heater meeting the standards for Tier III of NEEA's advanced water heating specification. or For R-2 Occupancy, electric heat pump water heater(s), meeting the standards for Tier III of NEEA's advanced water heating specification, shall supply domestic hot water to all units. If one water heater is serving more than one dwelling unit, all hot water supply and recirculation piping shall be insulated with R-8 minimum pipe insulation. To qualify to claim this credit, the building permit drawings shall specify the option being selected and shall specify the water heater equipment type and the minimum equipment efficiency. | 2.0 | 2.5 | | 5.7 | Water heating system shall include one of the following: Electric heat pump water heater with a minimum UEF of 2.9 and utilizing a split system configuration with the air-to-refrigerant heat exchanger located outdoors. Equipment shall meet Section 4, requirements for all units, of the NEEA standard Advanced Water Heating Specification with the UEF noted above. or For R-2 Occupancy, electric heat pump water heater(s), meeting the standards for Tier III of NEEA's advanced water heating specification and utilizing a split system configuration with the air-to-refrigerant heat exchanger located outdoors, shall supply domestic hot water to all units. If one water heater is serving more than one dwelling unit, all hot water supply and recirculation piping shall be insulated with R-8 minimum pipe insulation. To qualify to claim this credit, the building permit drawings shall specify the option being selected and shall specify the water heater equipment type and the minimum equipment efficiency. | 2.5 | 3.0 | | 5.8 | Combination water heating and space heating system shall include one of the following: Gas-fired heat pump water heater(s) meeting Tier 2 of the NEEA Advanced Water Heating Specification for Gas-Fueled Residential Storage Water Heaters Version 1.0. or For R-2 Occupancy, gas-fired heat pump water heater(s) meeting Tier 2 of the NEEA Advanced Water Heating Specification for Gas-Fueled Residential Storage Water Heaters Version 1.0., shall supply all units. or For R-2 Occupancy, gas-fired heat pump(s) meeting ANSI Z21.40.2 and Z21.40.4 or CSA, with a minimum UEF of 1.15, shall supply all units. To qualify to claim this credit, the building permit drawings shall specify the option being selected and shall specify the water heater equipment type and the minimum equipment efficiency and, for solar water heating systems, the calculation of the minimum energy savings. | 2.5 | 2.5 | | 6. RENEWABLE ELECTRIC ENERGY OPTION | | | | | 6.1 | For each 600 kWh of electrical generation per housing unit provided annually by on-site wind or solar equipment a 0.5 credit shall be allowed, up to 4.5 credits. Generation shall be calculated as follows: For solar electric systems, the design shall be demonstrated to meet this requirement using the National Renewable Energy Laboratory calculator PVWATTs or approved alternative by the code official. Documentation noting solar access shall be included on the plans. For wind generation projects designs shall document annual power generation based on the following factors: The wind turbine power curve; average annual wind speed at the site; frequency distribution of the wind speed at the site and height of the tower. To qualify to claim this credit, the building permit drawings shall specify the option being selected and shall show the photovoltaic or wind turbine equipment type, provide documentation of solar and wind access, and include a calculation of the minimum annual energy power production. | 0.5 – 4.5 | 0.5 – 4.5 | | 7. APPLIANCE PACKAGE OPTION | | | | | 7.1 | All of the following appliances shall be new and installed in the dwelling unit and shall meet the following standards: 1. Dishwasher, standard - Energy Star rated, Most Efficient 2021 or Dishwasher, compact – Energy Star rated (Version 6.0) 2. Refrigerator (if provided) - Energy Star rated (Version 5.1) 3. Washing machine (Residential) - Energy Star rated (Version 8.1) 4. Dryer - Energy Star rated, Most Efficient 2022 To qualify to claim this credit, the building permit drawings shall specify the option being selected and shall show the appliance type and provide documentation of Energy Star compliance. At the time of inspection, all appliances shall be installed and connected to utilities. Dryer ducts and exterior dryer vent caps are not permitted to be installed in the dwelling unit. | 0.5 | 1.5 |

| a | An alternative heating source sized at a maximum of 0.5 Watts/ft2 (equivalent) of heated floor area or 500 Watts, whichever is bigger, may be installed in the dwelling unit. | | --- | --- | | b | See Section R401.1 and residential building in Section R202 for Group R-2 scope. | | c | Option 3.11 can only be taken with Options 3.1 and 3.3. To qualify to claim Option 3.11 with 3.3, the system shall be a 1-2 speed heat pump system. Variable capacity heat pumps are ineligible from claiming this option. | | d | This option may only be claimed if serving System Type 4 or 5 from Table R406.2. | | e | Primary living areas include living, dining, kitchen, family rooms, and similar areas. | | f | Option 3.10 may only be taken with Efficient Water Heating Options 5.1 or 5.2. Equipment sizing for space heating shall be calculated as provided in Section R403.7 with increased capacity to provide a minimum of 75 percent of peak hot water demand or shall be sized in accordance with approved manufacturer's specifications or guidance. Supplementary heat for water heating system shall be in accordance with Section R403.5.7. |

Reviser's note: The brackets and enclosed material in the text of the above section occurred in the copy filed by the agency.

Wash. Admin. Code § 51-11R-40700 Section R407—Certified passive house.

R407.1 General. Projects shall comply with Section R407.2 or R407.3.

R407.2 Passive House Institute U.S. (PHIUS). Projects shall comply with PHIUS+ 2018 Passive Building Standard, including its USDOE Energy Star and Zero Energy Ready Home co-requisites, and performance calculations by PHIUS-approved software. Projects shall also comply with the provisions of Table R405.2.

R407.2.1 PHIUS documentation. Prior to the issuance of a building permit, the following items must be provided to the code official:

1. A list of compliance features.

2. A PHIUS precertification letter.

Prior to the issuance of a certificate of occupancy, the following item must be provided to the code official:

1. A PHIUS+ 2018 (or later) project certificate.

R407.3 Passive House Institute (PHI). Projects shall comply with Low Energy Building Standard, version 9f or later, including performance calculations by PHI-approved software. Projects shall also comply with the provisions of Section R401 through R404.

R407.3.1 PHI documentation. Prior to the issuance of a building permit, the following items must be provided to the code official:

1. A list of compliance features.

2. A statement from a passive house certifier that the modeled energy performance is congruent with the plans and specifications, and that the modeled performance meets said standard.

Prior to the issuance of a certificate of occupancy, the following item must be provided to the code official:

1. A PHI Low Energy Building project certificate.

History

• Statutory Authority: RCW 19.27A.045 and chapter 19.27A RCW. WSR 20-21-081, § 51-11R-40700, filed 10/19/20, effective 2/1/21. Statutory Authority: RCW 19.27A.020, 19.27A.045, 19.27A.160 and chapter 19.27 RCW. WSR 20-01-047, § 51-11R-40700, filed 12/9/19, effective 7/1/20.

Wash. Admin. Code § 51-11R-50000 Chapter 5—Existing buildings.

History

• Statutory Authority: RCW 19.27A.020, 19.27A.045, 19.27A.160, and 19.27.074. WSR 16-02-127, § 51-11R-50000, filed 1/6/16, effective 7/1/16. Statutory Authority: RCW 19.27A.020, 19.27A.045 and chapters 19.27 and 34.05 RCW. WSR 13-04-055, § 51-11R-50000, filed 2/1/13, effective 7/1/13.

Wash. Admin. Code § 51-11R-50100 Section R501—General.

R501.1 Scope. The provisions of this chapter shall control the alteration, repair, addition and change of occupancy of existing buildings and structures.

R501.1.1General. Except as specified in this chapter, this code shall not be used to require the removal, alteration, or abandonment of, nor prevent the continued use and maintenance of, an existing building or building system lawfully in existence at the time of adoption of this code. Unaltered portions of the existing building or building supply system shall not be required to comply with this code.

R501.1.2 Thermostats for accessory dwelling units. Where a separate dwelling unit, that provides independent facilities for living, sleeping, cooking, bathing and sanitation, is established within or attached to an existing dwelling unit, the heating and cooling for the newly-created dwelling unit shall be controllable with a separate programmable thermostat in accordance with Section R403.1.1.

R501.2Compliance.Additions, alterations, repairs or changes of occupancy to, or relocation of, an existing building, building system or portion thereof shall comply with Sections R502, R503, R504 or R505, respectively, in this code. Changes where unconditioned space is changed to conditioned space shall comply with Section R502.

R501.3 Maintenance. Buildings and structures, and parts thereof, shall be maintained in a safe and sanitary condition. Devices and systems that are required by this code shall be maintained in conformance with the code edition under which installed. The owner or the owner's authorized agent shall be responsible for the maintenance of buildings and structures. The requirements of this chapter shall not provide the basis for removal or abrogation of energy conservation, fire protection and safety systems and devices in existing structures.

R501.4 Compliance.Alterations, repairs, additions and changes of occupancy to, or relocation of, existing buildings and structures shall comply with the provisions for alterations, repairs, additions and changes of occupancy or relocation, respectively, in this code and the International Residential Code, International Building Code, International Existing Building Code, International Fire Code, International Fuel Gas Code, International Mechanical Code, Uniform Plumbing Code, International Property Maintenance Code, and NFPA 70.

R501.5 New and replacement materials. Except as otherwise required or permitted by this code, materials permitted by the applicable code for new construction shall be used. Like materials shall be permitted for repairs, provided hazards to life, health or property are not created. Hazardous materials shall not be used where the code for new construction would not permit their use in buildings of similar occupancy, purpose and location.

R501.6 Historic buildings. The code official may modify the specific requirements of this code for historic buildings and require alternative provisions which will result in a reasonable degree of energy efficiency. This modification may be allowed for those buildings or structures that are listed in the state or national register of historic places; designated as a historic property under local or state designation law or survey; certified as a contributing resource with a national register listed or locally designated historic district; or with an opinion or certification that the property is eligible to be listed on the national or state register of historic places either individually or as a contributing building to a historic district by the state historic preservation officer or the keeper of the National Register of Historic Places.

History

• Statutory Authority: RCW 19.27A.020, 19.27A.045, 19.27A.160, and chapter 19.27A RCW. WSR 24-03-084, § 51-11R-50100, filed 1/16/24, effective 3/15/24
• WSR 23-02-060, 23-12-102, and 23-20-022, § 51-11R-50100, filed 1/3/23, 6/7/23, and 9/25/23, effective 3/15/24. Statutory Authority: RCW 19.27A.045 and chapter 19.27A RCW. WSR 20-21-081, § 51-11R-50100, filed 10/19/20, effective 2/1/21. Statutory Authority: RCW 19.27A.020, 19.27A.045, 19.27A.160 and chapter 19.27 RCW. WSR 20-01-047, § 51-11R-50100, filed 12/9/19, effective 7/1/20. Statutory Authority: RCW 19.27A.020, 19.27A.045, 19.27A.160, and 19.27.074. WSR 16-02-127, § 51-11R-50100, filed 1/6/16, effective 7/1/16.

Wash. Admin. Code § 51-11R-50200 Section R502—Additions.

R502.1 General. Additions to an existing building, building system or portion thereof shall conform to the provisions of this code as those provisions relate to new construction without requiring the unaltered portion of the existing building or building system to comply with this code, except as specified in this chapter. Additions shall not create an unsafe or hazardous condition or overload existing building systems. An addition shall be deemed to comply with this code where the addition alone complies, where the existing building and addition comply with this code as a single building, or where the building with the addition uses no more energy than the existing building. Additions shall be in accordance with Section R502.3 or R502.4.

R502.1.1 Small additions.Additions not greater than 150 square feet (13.9 m2) shall not be required to comply with Section R406.

R502.2 Change in space conditioning. Any nonconditioned or low-energy space that is altered to become conditioned space shall be required to be brought into full compliance with this code.

| EXCEPTION: | Where the total building performance option in Section R405 is used to comply with this section, the annual energy use of the proposed design is permitted to be 110 percent of the annual energy use otherwise allowed by Section R405.3. | | --- | --- |

R502.3 Prescriptive compliance. Additions shall comply with Sections R502.3.1 through R502.3.4.

R502.3.1 Building envelope. New building envelope assemblies that are part of the addition shall comply with Sections R402.1, R402.2, R402.3.1 through R402.3.5, and R402.4.

| EXCEPTION: | Where nonconditioned space is changed to conditioned space, the building envelope of the addition shall comply where the UA, as determined in Section R402.1.5, of the existing building and the addition, and any alterations that are part of the project, is less than or equal to UA generated for the existing building. | | --- | --- |

R502.3.1.1 Existing ceilings with attic spaces. Where an addition greater than 150 square feet (13.9 m2) adjoins existing ceilings with attic spaces, the existing attic spaces shall comply with Section R402.

R502.3.2 Heating and cooling systems. HVAC ducts newly installed as part of an addition shall comply with Section R403.

| EXCEPTION: | The following need not comply with the testing requirements of Section R403.3.3: | | --- | --- | | | 1. Additions of less than 150 square feet. | | | 2. Duct systems that are documented to have been previously sealed as confirmed through field verification and diagnostic testing in accordance with procedures in WSU RS-33. | | | 3. Existing duct systems constructed, insulated or sealed with asbestos. |

R502.3.3 Service hot water systems. New service hot water systems that are part of the addition shall comply with Section R403.5.

R502.3.4 Lighting. New lighting systems that are part of the addition shall comply with Section 404.1.

R502.4 Existing plus addition compliance (Total Building Performance). Where nonconditioned space is changed to conditioned space the addition shall comply where the annual energy use of the addition and the existing building, and any alterations that are part of the project, is less than or equal to the annual energy use of the existing building when modeled in accordance with Section R405. The addition and any alterations that are part of the project shall comply with Section R405 in its entirety.

History

• Statutory Authority: RCW 19.27A.020, 19.27A.045, 19.27A.160, and chapter 19.27A RCW. WSR 24-03-084, § 51-11R-50200, filed 1/16/24, effective 3/15/24
• WSR 23-02-060, 23-12-102, and 23-20-022, § 51-11R-50200, filed 1/3/23, 6/7/23, and 9/25/23, effective 3/15/24. Statutory Authority: RCW 19.27A.020, 19.27A.045, 19.27A.160 and chapter 19.27 RCW. WSR 20-01-047, § 51-11R-50200, filed 12/9/19, effective 7/1/20. Statutory Authority: RCW 19.27A.025, 19.27A.045, 19.27A.160, and 19.27.074. WSR 17-10-063, § 51-11R-50200, filed 5/2/17, effective 6/2/17. Statutory Authority: RCW 19.27A.020, 19.27A.045, 19.27A.160, and 19.27.074. WSR 16-02-127, § 51-11R-50200, filed 1/6/16, effective 7/1/16.

Wash. Admin. Code § 51-11R-50300 Section R503—Alterations.

R503.1 General.Alterations to any building or structure shall comply with the requirements of the code for new construction, without requiring the unaltered portions of the existing building or building system to comply with this code. Alterations shall be such that the existing building or structure is no less conforming to the provisions of this code than the existing building or structure was prior to the alteration.

Alterations shall not create an unsafe or hazardous condition or overload existing building systems.

Alterations shall be such that the existing building or structure uses no more energy than the existing building or structure prior to the alteration. Alterations to existing buildings shall comply with Sections R503.1.1 through R503.2.

The code official may approve designs of alterations which do not fully conform to all of the requirements of this code where in the opinion of the code official full compliance is physically impossible and/or economically impractical and:

The alteration improves the energy efficiency of the building; or

The alteration is energy efficient and is necessary for the health, safety, and welfare of the general public.

R503.1.1 Building envelope. Building envelope assemblies that are part of the alteration shall comply with Section R402.1.3 or R402.1.5, Sections R402.2.1 through R402.2.10, R402.3.1, R402.3.2, R402.3.5, and R402.4.2.

| EXCEPTION: | The following alterations need not comply with the requirements for new construction provided the energy use of the building is not increased: | | --- | --- | | | 1. Storm windows installed over existing fenestration. | | | 2. Existing ceiling, wall or floor cavities exposed during construction provided that these cavities are filled with insulation. 2 x 4 framed walls shall be insulated to a minimum of R-15 and 2 x 6 framed walls shall be insulated to a minimum of R-21. | | | 3. Construction where the existing roof, wall or floor cavity is not exposed. | | | 4. Roof recover. | | | 5. Roofs without insulation in the cavity and where the sheathing or insulation is exposed during reroofing shall be insulated either above or below the sheathing. | | | 6. Surface-applied window film installed on existing single pane fenestration assemblies to reduce solar heat gain provided the code does not require the glazing fenestration to be replaced. |

R503.1.1.1 Replacement fenestration. Where some or all of an existing fenestration unit is replaced with a new fenestration product, including sash and glazing, the replacement fenestration unit shall meet the applicable requirements for U-factor and SHGC in Table R402.1.3. Where more than one replacement fenestration unit is being installed, an area-weighted average of the U-factor and SHGC of all replacement fenestration shall be permitted to be used to demonstrate compliance.

R503.1.2 Heating and cooling systems. New heating, cooling and duct systems that are part of the alteration shall comply with Section R403.

| EXCEPTIONS: | 1. Where ducts from an existing heating and cooling system are extended, duct systems with less than 40 linear feet in unconditioned spaces shall not be required to be tested in accordance with Section R403.2.2. | | --- | --- | | | 2. Existing duct systems constructed, insulated or sealed with asbestos. |

R503.1.3 Service hot water systems. New service hot water systems that are part of the alteration shall comply with Section R403.5.

| EXCEPTION: | Replacement of water heating equipment shall not be required to comply with Section R403.5.5. | | --- | --- |

R503.1.4 Lighting. New lighting systems that are part of the alteration shall comply with Section R404.1.

| EXCEPTION: | Alterations that replace less than 10 percent of the luminaires in a space, provided that such alterations do not increase the installed interior lighting power. | | --- | --- |

History

• Statutory Authority: RCW 19.27A.020, 19.27A.045, 19.27A.160, and chapter 19.27A RCW. WSR 24-03-084, § 51-11R-50300, filed 1/16/24, effective 3/15/24
• WSR 23-02-060, 23-12-102, and 23-20-022, § 51-11R-50300, filed 1/3/23, 6/7/23, and 9/25/23, effective 3/15/24. Statutory Authority: RCW 19.27A.045 and chapter 19.27A RCW. WSR 20-21-081, § 51-11R-50300, filed 10/19/20, effective 2/1/21. Statutory Authority: RCW 19.27A.020, 19.27A.045, 19.27A.160 and chapter 19.27 RCW. WSR 20-01-047, § 51-11R-50300, filed 12/9/19, effective 7/1/20. Statutory Authority: RCW 19.27A.025, 19.27A.045, 19.27A.160, and 19.27.074. WSR 17-10-063, § 51-11R-50300, filed 5/2/17, effective 6/2/17. Statutory Authority: RCW 19.27A.020, 19.27A.045, 19.27A.160, and 19.27.074. WSR 16-02-127, § 51-11R-50300, filed 1/6/16, effective 7/1/16.

Wash. Admin. Code § 51-11R-50400 Section R504—Repairs.

R504.1 General. Buildings, structures and parts thereof shall be repaired in compliance with Section R501.3 and this section. Work on nondamaged components that is necessary for the required repair of damaged components shall be considered part of the repair and shall not be subject to the requirements for alterations in this chapter. Routine maintenance required by Section R501.3, ordinary repairs exempt from permit, and abatement of wear due to normal service conditions shall not be subject to the requirements for repairs in this section.

The code official may approve designs of repairs which do not fully conform with all of the requirements of this code where in the opinion of the code official full compliance is physically impossible and/or economically impractical and:

1. The repair improves the energy efficiency of the building; or

2. The repair is energy efficient and is necessary for the health, safety, and welfare of the general public.

R504.2 Application. For the purposes of this code, the following shall be considered repairs.

1. Glass only replacements in an existing sash and frame.

2. Roof repairs.

3. Repairs where only the bulb and/or ballast within the existing luminaires in a space are replaced provided that the replacement does not increase the installed interior lighting power.

History

• Statutory Authority: RCW 19.27A.045 and chapter 19.27A RCW. WSR 20-21-081, § 51-11R-50400, filed 10/19/20, effective 2/1/21. Statutory Authority: RCW 19.27A.020, 19.27A.045, 19.27A.160, and 19.27.074. WSR 16-02-127, § 51-11R-50400, filed 1/6/16, effective 7/1/16.

Wash. Admin. Code § 51-11R-50500 Section R505—Change of occupancy or use.

R505.1 General. Any space not within the scope of Section R101.2 which is converted to space that is within the scope of Section R101.2 shall be brought into full compliance with this code.

Spaces undergoing a change in occupancy that would result in an increase in demand for either fossil fuel or electrical energy shall comply with this code.

Any space that is converted to a dwelling unit or portion thereof from another use or occupancy shall comply with this code.

| EXCEPTION: | Where the simulated performance option in Section R405 is used to comply with this section, the annual energy use of the proposed design is permitted to be 110 percent of the annual energy use otherwise allowed by Section R405.3. | | --- | --- |

R505.1.1 Unconditioned space. Any unconditioned or low-energy space that is altered to become a conditioned space shall comply with Section R502.

History

• Statutory Authority: RCW 19.27A.020, 19.27A.045, 19.27A.160, and chapter 19.27A RCW. WSR 23-02-060, 23-12-102, and 23-20-022, § 51-11R-50500, filed 1/3/23, 6/7/23, and 9/25/23, effective 3/15/24. Statutory Authority: RCW 19.27A.020, 19.27A.045, 19.27A.160, and 19.27.074. WSR 16-02-127, § 51-11R-50500, filed 1/6/16, effective 7/1/16.

Wash. Admin. Code § 51-11R-51000 Chapter 6—Referenced standards.

This chapter lists the standards that are referenced in various sections of this document. The standards are listed herein by the promulgating agency of the standard, the standard identification, the effective date and title, and the section or sections of this document that reference the standard. The application of the referenced standards shall be as specified in Section R106.

| AAMA | American Architectural Manufacturers Association | | | | --- | --- | --- | --- | | | 1827 Walden Office Square | | | | | Suite 550 | | | | | Schaumburg, IL 60173-4268 | | | | Standard reference number | Title | | Referenced in code section number | | AAMA/WDMA/CSA 101/I.S.2/A C440-17 | North American Fenestration Standard/Specifications for Windows, Doors and Unit Skylights | . . . . . . . . | R402.4.2 | | ACCA | Air Conditioning Contractors of America | | | | | 2800 Shirlington Road, Suite 300 | | | | | Arlington, VA 22206 | | | | Standard reference number | Title | | Referenced in code section number | | Manual J-16 | Residential Load Calculation Eighth Edition | . . . . . . . . | R403.7 | | Manual S-14 | Residential Equipment | . . . . . . . . | R403.7 | | ANSI | American National Standards Institute 25 West 43rd Street, 4th Floor New York, NY 10036 | | | | Standard reference number | Title | | Referenced in code section number | | Z21.50-2016/CSA 2.22-2016 | Vented Decorative Gas Appliances | . . . . . . . . | R403.7.1 | | Z21.88-2017/CSA 2.33-2017 | Vented Gas Fireplace Heaters | . . . . . . . . | R403.7.1 | | Z21.40.2-1996 | Gas-fired, Work Activated Air-Conditioning and Heat Pump Appliances (Internal Combustion) | . . . . . . . . | Table R406.3 | | Z21.40.4-1996 | Performance Testing and Rating of Gas-Fired, Air-Conditioning and Heat Pump Appliances | . . . . . . . . | Table R406.3 | | APSP | The Association of Pool and Spa Professionals | | | | | 2111 Eisenhower Avenue, Suite 500 | | | | | Alexandria, VA 22206 | | | | Standard reference number | Title | | Referenced in code section number | | ANSI/APSP/ICC 14-2019 | American National Standard for Portable Electric Spa Energy Efficiency | . . . . . . . . | R403.11 | | ANSI/APSP/ICC 15a-2011 | American National Standard for Residential Swimming Pool and Spa Energy Efficiency—Includes Addenda A approved January 9, 2013 | . . . . . . . . | R403.12 | | ASHRAE | American Society of Heating, Refrigerating and Air-Conditioning Engineers, Inc. | | | | | 1791 Tullie Circle, N.E. | | | | | Atlanta, GA 30329-2305 | | | | Standard reference number | Title | | Referenced in code section number | | ASHRAE-2021 | ASHRAE Handbook of Fundamentals | . . . . . . . . | R402.1.5, Table R405.5.2(1) | | ASHRAE 193-2010 (RA 2014) | Method of Test for Determining the Airtightness of HVAC Equipment | . . . . . . . . | R403.3.4.1 | | ASTM | ASTM International | | | | | 100 Barr Harbor Drive | | | | | West Conshohocken, PA 19428-2859 | | | | Standard reference number | Title | | Referenced in code section number | | C1363-11 | Standard Test Method for Thermal Performance of Building Materials and Envelope Assemblies by Means of a Hot Box Apparatus | . . . . . . . . | R303.1.4.1 | | E283-2004 (2012) | Test Method for Determining the Rate of Air Leakage Through Exterior Windows, Curtain Walls and Doors Under Specified Pressure Differences Across the Specimen | . . . . . . . . | R402.4.3 | | E779-2010 (2018) | Standard Test Method for Determining Air Leakage Rate by Fan Pressurization | . . . . . . . . | R402.4.1.2 | | E1554/E1554M-E2013 | Standard Test Method for Determining Air Leakage of Air Distribution Systems by Fan Pressurization | . . . . . . . . | R403.3.5 | | E1827-2011 (2017) | Standard Test Methods for Determining Airtightness of Building Using an Orifice Blower Door | . . . . . . . . | R402.4.1.2 | | E2178-2013 | Standard Test Method for Air Permeance of Building Materials | . . . . . . . . | R303.1.5 | | E3158-2018 | Standard Test Method for Measuring the Air Leakage Rate of a Large or Multizone Building | . . . . . . . . | R402.4.1.2 | | CSA | Canadian Standards Association | | | | | 5060 Spectrum Way | | | | | Mississauga, Ontario, Canada L4W 5N6 | | | | Standard reference number | Title | | Referenced in code section number | | AAMA/WDMA/CSA 101/I.S.2/A440-17 | North American Fenestration Standard/Specification for Windows, Doors and Unit Skylights | . . . . . . . . | R402.4.2 | | CSA 55.1-2015 | Test Method for Measuring Efficiency and Pressure Loss of Drain Water Heat Recovery Systems | . . . . . . . . | R403.5.4, Table R406.2 | | CSA 55.2-2015 | Drain Water Heat Recovery Units | . . . . . . . . | R403.5.4 | | CSA P.4.1-15 | Testing Method for Measuring Annual Fireplace Efficiency | . . . . . . . . | R403.7.1 | | DASMA | Door and Access Systems Manufacturers Association | | | | | 1300 Sumner Avenue | | | | | Cleveland, OH 44115-2851 | | | | 105-2017 | Test Method for Thermal Transmittance and Air Infiltration of Garage Doors and Rolling Doors | . . . . . . . . | R303.1.3 | | HVI | Home Ventilating Institute | | | | | 1000 North Rand Road, Suite 214 | | | | | Wauconda, IL 60084 | | | | 916-18 | Airflow Test Procedure | . . . . . . . . | R303.1.3 | | ICC | International Code Council, Inc. | | | | | 500 New Jersey Avenue, N.W. | | | | | 6th Floor | | | | | Washington, DC 20001 | | | | Standard reference number | Title | | Referenced in code section number | | ANSI/APSP/ICC 14-2019 | American National Standard for Portable Electric Spa Energy Efficiency | . . . . . . . . | R403.11 | | ANSI/APSP/ICC 15a-2011 | American National Standard for Residential Swimming Pool and Spa Energy Efficiency—Includes Addenda A approved January 9, 2013 | . . . . . . . . | R403.12 | | ANSI/RESNET/ICC 380-2019 | Standard for Testing Airtightness of building, Dwelling Unit and Sleeping Unit Enclosures; Airtightness of Heating and Cooling Air Distribution Systems, and Airflow of Mechanical Ventilation Systems | . . . . . . . . | R402.4.1.2 | | IBC-21 | International Building Code | . . . . . . . . | R201.3, R303.2, R402.11, R4501.4 | | ICC 400-17 | Standard on the Design and Construction of Log Structures | . . . . . . . . | Table R402.1.1 | | ICC 500-2020 | ICC/NSSA Standard for the Design and Construction of Storm Shelters | . . . . . . . . | R402.5 | | IFC-21 | International Fire Code | . . . . . . . . | R201.3, R501.4 | | IFGC-21 | International Fuel Gas Code | . . . . . . . . | R201.3, R501.4 | | IFGC-21 | International Mechanical Code | . . . . . . . . | R201.3, R403.3.2, R403.6, R501.4 | | IPMC-21 | International Property Maintenance Code | . . . . . . . . | R501.4 | | IRC-21 | International Residential Code | . . . . . . . . | R104.2.1, R201.3, R303.2, R401.2, R403.2.2, R403.5, R406.1, R406.2, Table R406.2 | | IEEE | The Institute of Electrical and Electronic Engineers, Inc. | | | | | 3 Park Avenue | | | | | New York, NY 10016-5997 | | | | Standard reference number | Title | | Referenced in code section number | | 515.1-2012 | IEEE Standard for the Testing, Design, Installation and Maintenance of Electrical Resistance Trace Heating for Commercial Applications | . . . . . . . . | R403.5.1.2 | | ISO | International Organization for Standardization | | | | | 1, rue de Varembe, Case postale 56, CH-1211 | | | | | Geneva, Switzerland | | | | Standard reference number | Title | | Referenced in code section number | | ISO/IEC 17024-2012 | Conformity Assessment: General requirements for bodies operating certification of persons | . . . . . . . . | R402.4.1.2 | | NEEA | Northwest Energy Efficiency Alliance | | | | | 421 S.W. 6th Ave., Suite 600 | | | | | Portland, OR 97204 | | | | Standard reference number | Title | | Referenced in code section number | | NEEA-2011 | Northern Climate Specification for Heat Pump Water Heaters, Vers. 4.0 | . . . . . . . . | Table R406.3 | | NEEA-2019 | Advanced Water Heating Specifications for Gas-Fueled Residential Storage Water Heaters, Version 1.0. | . . . . . . . . | Table R406.3 | | NEEP | Northeast Energy Efficiency Partnership, Inc. | | | | | 24 School Street, 2nd Floor | | | | | Boston, MA 02108-4314 | | | | Standard reference number | Title | | Referenced in code section number | | ccASHP Version 3.1 | Cold Climate Air Source Heat Pump (ccASHP) Product List and Specifications: https://neep.org/heating-electrification/ccashp-specification-product-list | . . . . . . . . | Table R406.3 | | NEMA | National Electrical Manufacturers Association | | | | | 1300 17th Street N No. 900 | | | | | Arlington, VA 22209 | | | | Standard reference number | Title | | Referenced in code section number | | OS4-2016 | Requirements for Air-Sealed Boxes for Electrical and Communications Applications | . . . . . . . . | R402.4.4 | | NFPA | National Fire Protection Association | | | | | 1 Batterymarch Park | | | | | Quincy, MA 02169-7417 | | | | Standard reference number | Title | | Referenced in code section number | | 70-20 | National Electrical Code | . . . . . . . . | R501.4 | | NFRC | National Fenestration Rating Council, Inc. | | | | | 6305 Ivy Lane, Suite 140 | | | | | Greenbelt, MD 20770 | | | | Standard reference number | Title | | Referenced in code section number | | 100-2020 | Procedure for Determining Fenestration Products U-factors | . . . . . . . . | R303.1.3 | | 200-2020 | Procedure for Determining Fenestration Product Solar Heat Gain Coefficients and Visible Transmittance at Normal Incidence | . . . . . . . . | R303.1.3 | | 400-2020 | Procedure for Determining Fenestration Product Air Leakage | . . . . . . . . | R402.4.2 | | UL | Underwriters Laboratory | | | | | 333 Pfingsten Road | | | | | Northbrook, IL 60062 | | | | Standard reference number | Title | | Referenced in code section number | | UL 127-11 | Factory Built Fireplace | . . . . . . . . | R402.3.6 | | UL 515-11 | Electric Resistance Heat Tracing for Commercial and Industrial Applications | . . . . . . . . | R403.5.1.2 | | UL 907-94 | Fireplace Accessories (with revisions through April 2010) | . . . . . . . . | R402.3.6 | | US-FTC | United States-Federal Trade Commission | | | | | 600 Pennsylvania Avenue N.W. | | | | | Washington, DC 20580 | | | | Standard reference number | Title | | Referenced in code section number | | C.F.R. Title 16 (2015) | R-value Rule | . . . . . . . . | Rule R303.1.4 | | WDMA | Window and Door Manufacturers Association | | | | | 1400 East Touhy Avenue, Suite 470 | | | | | Des Plaines, IL 60018 | | | | Standard reference number | Title | | Referenced in code section number | | AAMA/WDMA/CSA 101/I.S.2/A440-17 | North American Fenestration Standard/Specification for Windows, Doors and Unit Skylights | . . . . . . . . | R402.4.2 | | WSU | Washington State University Energy Extension Program | | | | | 905 Plum Street S.E., Bldg 3 | | | | | P.O. Box 43165 | | | | | Olympia, WA 98506-3166 | | | | Standard reference number | Title | | Referenced in code section number | | WSU RS 33 | Duct Testing Standard for New and Existing Construction Publication No. WSUEEP15-016 | . . . . . . . . | R403.3.3 |

History

• Statutory Authority: RCW 19.27A.020, 19.27A.045, 19.27A.160, and chapter 19.27A RCW. WSR 24-03-084, § 51-11R-51000, filed 1/16/24, effective 3/15/24
• WSR 23-02-060, 23-12-102, and 23-20-022, § 51-11R-51000, filed 1/3/23, 6/7/23, and 9/25/23, effective 3/15/24. Statutory Authority: RCW 19.27A.020, 19.27A.045, 19.27A.160 and chapter 19.27 RCW. WSR 20-01-047, § 51-11R-51000, filed 12/9/19, effective 7/1/20. Statutory Authority: RCW 19.27A.020, 19.27A.045, 19.27A.160, and 19.27.074. WSR 16-02-127, § 51-11R-51000, filed 1/6/16, effective 7/1/16.

Wash. Admin. Code § 51-11R-58000 Appendix RA—Optional energy efficiency measures—One step.

Building owners may choose to use this appendix to achieve an additional 6 percent savings in building energy use. The number of additional energy efficiency credits required by Section R406.3 would be increased by the following amounts:

1.0 credit for each new single-family, two-family and townhouse dwelling unit.

0.5 credit for each new dwelling unit within an R-2 occupancy building.

0.5 credit for each addition smaller than 500 square feet to a single-family, two-family or townhouse dwelling unit.

1.0 credit for each addition of 500 square feet or larger to a single-family, two-family or townhouse dwelling unit.

Where Section R405, Simulated performance alternative, is used, the maximum allowable energy consumption shall be 92 percent of the value calculated according to Section R405.3.

History

• Statutory Authority: RCW 19.27A.020, 19.27A.045, 19.27A.160 and chapter 19.27 RCW. WSR 20-01-047, § 51-11R-58000, filed 12/9/19, effective 7/1/20.

Wash. Admin. Code § 51-11R-59000 Appendix RB—Optional energy efficiency measures—Two step.

Building owners may choose to use this appendix to achieve an additional 12 percent savings in building energy use. The number of additional energy efficiency credits required by Section R406.3 would be increased by the following amounts:

2.0 credit for each new single-family, two-family and townhouse dwelling unit.

1.0 credit for each new dwelling unit within an R-2 occupancy building.

1.0 credit for each addition smaller than 500 square feet to a single-family, two-family or townhouse dwelling unit.

1.5 credit for each addition of 500 square feet or larger to a single-family, two-family or townhouse dwelling unit.

Where Section R405, Simulated performance alternative, is used, the maximum allowable energy consumption shall be 84 percent of the value calculated according to Section R405.3.

History

• Statutory Authority: RCW 19.27A.045 and chapter 19.27A RCW. WSR 20-21-081, § 51-11R-59000, filed 10/19/20, effective 2/1/21. Statutory Authority: RCW 19.27A.020, 19.27A.045, 19.27A.160 and chapter 19.27 RCW. WSR 20-01-047, § 51-11R-59000, filed 12/9/19, effective 7/1/20.

Wash. Admin. Code § 51-11R-60000 Appendix RC—Exterior design conditions.

As required by Section R302.2, the heating or cooling outdoor design temperatures shall be selected from Table RC-1.

History

• Statutory Authority: RCW 19.27A.020, 19.27A.045, 19.27A.160 and chapter 19.27 RCW. WSR 20-01-047, § 51-11R-60000, filed 12/9/19, effective 7/1/20. Statutory Authority: RCW 19.27A.020, 19.27A.045 and chapters 19.27 and 34.05 RCW. WSR 13-04-055, § 51-11R-60000, filed 2/1/13, effective 7/1/13.

Wash. Admin. Code § 51-11R-60100 Table RC-1—Outdoor design temperatures for Washington.

TABLE RC-1

OUTDOOR DESIGN TEMPERATURES

| Location | Outdoor Design Temp Heating (°F) | Outdoor Design Temp Cooling (°F) | | --- | --- | --- | | Aberdeen 20NNE | 25 | 83 | | Anacortes | 24 | 72 | | Anatone | -4 | 89 | | Auburn | 25 | 84 | | Battleground | 19 | 91 | | Bellevue | 24 | 83 | | Bellingham 2N | 19 | 78 | | Blaine | 17 | 73 | | Bremerton | 29 | 83 | | Burlington | 19 | 77 | | Chehalis | 21 | 87 | | Chelan | 10 | 89 | | Cheney | 4 | 94 | | Chesaw | -11 | 81 | | Clarkston | 10 | 94 | | Cle Elum | 1 | 91 | | Colfax 1NW | 2 | 94 | | Colville AP | -2 | 92 | | Concrete | 19 | 83 | | Connell 4NNW | 6 | 100 | | Cougar 5E | 25 | 93 | | Dallesport AP | 14 | 99 | | Darrington RS | 13 | 85 | | Davenport | 5 | 92 | | Edmonds | 24 | 82 | | Ellensburg AP | 2 | 90 | | Elma | 24 | 88 | | Ephrata AP | 7 | 97 | | Everett Paine AFB | 21 | 79 | | Forks 1E | 23 | 81 | | Glacier RS | 13 | 82 | | Glenoma (Kosmos) | 18 | 89 | | Goldendale | 7 | 94 | | Grays River Hatchery | 24 | 86 | | Greenwater | 1.4 | 84 | | Grotto | 21 | 84 | | Hoquiam AP | 26 | 79 | | Inchelium 2NW | 0 | 92 | | John Day Dam | 19 | 100 | | Kent | 21 | 85 | | Kirkland | 17 | 83 | | La Grande | 23 | 88 | | Leavenworth | -3 | 93 | | Little Goose Dam | 22 | 101 | | Long Beach 3NNE | 25 | 77 | | Longview | 24 | 87 | | Lower Granite Dam | 14 | 98 | | Lower Monument Dam | 18 | 103 | | Marysville | 23 | 79 | | Metaline Falls | -1 | 89 | | Methow 2W | 1 | 89 | | Nespelem 2S | -4 | 93 | | Newhalem | 19 | 89 | | Newport | -5 | 92 | | Northport | 2 | 92 | | Oak Harbor | 16 | 74 | | Odessa | 7 | 100 | | Olga 2SE | 24 | 71 | | Olympia AP | 17 | 85 | | Omak 2NW | 3 | 90 | | Oroville | 5 | 93 | | Othello | 9 | 98 | | Packwood | 16 | 90 | | Plain | -3 | 89 | | Pleasant View | 16 | 98 | | Pomeroy | 3 | 95 | | Port Angeles | 28 | 75 | | Port Townsend | 25 | 76 | | Prosser | 12 | 97 | | Puyallup | 19 | 86 | | Quilcene 2SW | 23 | 83 | | Quinault RS | 25 | 84 | | Rainier, Longmire | 15 | 85 | | Paradise RS | 8 | 71 | | Raymond | 28 | 81 | | Redmond | 17 | 83 | | Republic | -9 | 87 | | Richland | 11 | 101 | | Ritzville | 6 | 99 | | Satus Pass | 10 | 90 | | Seattle: SeaTac AP | 24 | 83 | | Sedro Woolley 1E | 19 | 78 | | Sequim | 23 | 78 | | Shelton | 23 | 85 | | Smyrna | 8 | 102 | | Snohomish | 21 | 81 | | Snoqualmie Pass | 6 | 80 | | Spokane AP | 4 | 92 | | Spokane CO | 10 | 96 | | Stampede Pass | 7 | 76 | | Stehekin 3NW | 12 | 85 | | Stevens Pass | 6 | 77 | | Tacoma CO | 29 | 82 | | Tatoosh Island | 31 | 63 | | Toledo AP | 17 | 84 | | Vancouver | 22 | 88 | | Vashon Island | 28 | 78 | | Walla Walla AP | 6 | 96 | | Waterville | 1 | 88 | | Wellpinit | 1 | 93 | | Wenatchee CO | 10 | 92 | | Whidbey Island | 11 | 71 | | Willapa Harbor | 26 | 81 | | Wilson Creek | 3 | 96 | | Winthrop 1WSW | -12 | 91 | | Yakima AP | 11 | 94 |

ABBREVIATIONS:

AFB Air Force Base

AP Airport

CO City Office

RS Ranger Station

Typical: "4(miles)NE"

History

• Statutory Authority: RCW 19.27A.020, 19.27A.045, 19.27A.160 and chapter 19.27 RCW. WSR 20-01-047, § 51-11R-60100, filed 12/9/19, effective 7/1/20. Statutory Authority: RCW 19.27A.020, 19.27A.045 and chapters 19.27 and 34.05 RCW. WSR 13-04-055, § 51-11R-60100, filed 2/1/13, effective 7/1/13.

Chapter 51-16 State Building Code Guidelines.

Wash. Admin. Code § 51-16-010 Authority.

These guidelines are adopted under the authority of chapter 19.27 RCW.

History

• Statutory Authority: RCW 19.27.074, chapter 19.27 RCW and 1991 c 139. WSR 92-01-069, § 51-16-010, filed 12/13/91, effective 7/1/92. Statutory Authority: RCW 19.27.074. WSR 88-24-018 (Order 88-11), § 51-16-010, filed 12/1/88, effective 7/1/89. Statutory Authority: 1985 c 360. WSR 85-24-029 (Order 85-13), § 51-16-010, filed 11/26/85, effective 6/11/86.

Wash. Admin. Code § 51-16-020 Purpose.

The purpose of these guidelines is to provide local governments with amendatory language for specific applications. The guidelines are not required to be adopted and enforced by local governments.

History

• Statutory Authority: RCW 19.27.074, chapter 19.27 RCW and 1991 c 139. WSR 92-01-069, § 51-16-020, filed 12/13/91, effective 7/1/92. Statutory Authority: RCW 19.27.074. WSR 88-24-018 (Order 88-11), § 51-16-020, filed 12/1/88, effective 7/1/89. Statutory Authority: 1985 c 360. WSR 85-24-029 (Order 85-13), § 51-16-020, filed 11/26/85, effective 6/11/86.

Wash. Admin. Code § 51-16-030 Exemptions for indigent housing guidelines.

Cities and counties are permitted the option of adopting exemptions from the state building code requirements for buildings whose character of use or occupancy has been changed in order to provide housing for indigent persons. The adoption of an ordinance or resolution by cities and counties for the purpose to provide for occupancy exemptions for indigent housing as outlined in this section, shall not be considered a local government residential amendment requiring approval by the state building code council.

The guideline shall read as follows:

The character of use or occupancy of an existing building located in this state, may be changed in order to provide housing for indigent persons, without conforming to all of the requirements of the State Building Code provided that:

1. The building official has reviewed and approved the proposed exemption; and,

2. The proposed housing for indigent persons is less hazardous than the existing use; and,

3. Any code deficiencies exempted pose no threat to human life, health, or safety; and,

4. The building or buildings exempted are owned or administered by a public agency or nonprofit corporation; and,

5. The exemption is authorized for no more than five years, subject to renewal of the exemption by the building official.

History

• Statutory Authority: RCW 19.27.074, chapter 19.27 RCW and 1991 c 139. WSR 92-01-069, § 51-16-030, filed 12/13/91, effective 7/1/92. Statutory Authority: RCW 19.27.020 and 19.27.074. WSR 91-01-117, § 51-16-030, filed 12/19/90, effective 7/1/91. Statutory Authority: Chapters 19.27, 19.27A and 70.92 RCW, and 1989 c 266. WSR 90-02-110, § 51-16-030, filed 1/3/90, effective 7/1/90. Statutory Authority: RCW 19.27.074. WSR 88-24-018 and 89-11-081 (Orders 88-11 and 88-11A), § 51-16-030, filed 12/1/88 and 5/23/89, effective 7/1/89. Statutory Authority: 1985 c 360. WSR 85-24-029 (Order 85-13), § 51-16-030, filed 11/26/85, effective 6/11/86.

Wash. Admin. Code § 51-16-080 Permit exemptions guideline.

Cities and counties are permitted the option of adopting a one thousand five hundred dollar building permit exemption for certain construction and alteration activities for Group R, Division 3 and Group M, Division 1 Occupancies. To adopt the permit exemption guideline, the following section of the 1991 Uniform Building Code shall be amended as follows:

(1) Section 301(b) of the Uniform Building Code shall be amended to read as follows:

(b) Exempted work. A building permit shall not be required for the following:

1. One-story detached accessory buildings used as tool and storage sheds, playhouses and similar uses, provided the projected roof area does not exceed one hundred twenty square feet.

2. Fences not over six feet high.

3. Oil derricks.

4. Movable cases, counters, and partitions not over five feet nine inches high.

5. Retaining walls which are not over four feet in height measured from the bottom of the footing to the top of the wall, unless supporting a surcharge or impounding Class I, II, or III-A liquids.

6. Water tanks supported directly upon grade if the capacity does not exceed five thousand gallons and the ratio of height to diameter or width does not exceed two to one.

7. Platforms, walks, and driveways not more than thirty inches above grade and not over any basement or story below.

8. Painting, papering, and similar finish work.

9. Temporary motion picture, television, and theater stage sets and scenery.

10. Window awnings supported by an exterior wall of Group R, Division 3, and Group M Occupancies when projecting not more than fifty-four inches.

11. Prefabricated swimming pools accessory to a Group R, Division 3 Occupancy in which the pool walls are entirely above the adjacent grade and if the capacity does not exceed five thousand gallons.

12. Minor construction and alteration activities to Group R, Division 3 and Group M, Division 1 Occupancies, as determined by the building official, which the total valuation, as determined in Section 304(b) or as documented by the applicant to the satisfaction of the building official, does not exceed one thousand five hundred dollars in any twelve-month period: Provided, That the construction and/or alteration activity does not affect any structural components, or reduce existing egress, light, air, and ventilation conditions. This exemption does not include electrical, plumbing, or mechanical activities. The permit exemption shall not otherwise exempt the construction or alteration from the substantive standards of the codes enumerated in RCW 19.27.031, as amended and maintained by the state building code council under RCW 19.27.070.

Unless otherwise exempted, separate plumbing, electrical, and mechanical permits will be required for the above exempted items.

Exemption from the permit requirements of this code shall not be deemed to grant authorization for any work to be done in any manner in violation of the provisions of this code or any other laws or ordinances of this jurisdiction.

The adoption of an ordinance or resolution by cities and counties for the purpose to provide for a permit exemption as outlined in this section, shall not be considered a local government residential amendment requiring approval by the state building code council.

History

• Statutory Authority: RCW 19.27.074, chapter 19.27 RCW and 1991 c 139. WSR 92-01-069, § 51-16-080, filed 12/13/91, effective 7/1/92. Statutory Authority: RCW 19.27.060 (7)(b). WSR 90-13-033, § 51-16-080, filed 6/13/90, effective 7/23/90. Statutory Authority: RCW 19.27.074. WSR 88-24-018 (Order 88-11), § 51-16-080, filed 12/1/88, effective 7/1/89. Statutory Authority: 1985 c 360. WSR 85-24-029 (Order 85-13), § 51-16-080, filed 11/26/85, effective 6/11/86.

Chapter 51-50 State Building Code adoption and amendment of the 2021 edition of the International Building Code.

Wash. Admin. Code § 51-50-001 Authority.

These rules are adopted under the authority of chapter 19.27 RCW.

History

• Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 04-01-108, § 51-50-001, filed 12/17/03, effective 7/1/04.

Wash. Admin. Code § 51-50-002 Purpose.

The purpose of these rules is to implement the provisions of chapter 19.27 RCW, which provides that the state building code council shall maintain the State Building Code in a status which is consistent with the purpose as set forth in RCW 19.27.020. In maintaining the codes the council shall regularly review updated versions of the codes adopted under the act, and other pertinent information, and shall amend the codes as deemed appropriate by the council.

History

• Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 04-01-108, § 51-50-002, filed 12/17/03, effective 7/1/04.

Wash. Admin. Code § 51-50-003 International Building Code.

The 2021 edition of the International Building Code, including Appendix E, published by the International Code Council is hereby adopted by reference with the exceptions noted in this chapter of the Washington Administrative Code.

History

• Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 22-13-094, 23-12-103, and 23-20-023, § 51-50-003, filed 6/14/22, 6/7/23, and 9/25/23, effective 3/15/24
• WSR 20-01-090, § 51-50-003, filed 12/12/19, effective 7/1/20
• WSR 16-03-064, § 51-50-003, filed 1/19/16, effective 7/1/16. Statutory Authority: RCW 19.27.031 and chapters 19.27 and 34.05 RCW. WSR 13-04-067, § 51-50-003, filed 2/1/13, effective 7/1/13. Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 10-03-097, § 51-50-003, filed 1/20/10, effective 7/1/10. Statutory Authority: RCW 19.27.074, 19.27.020, and chapters 70.92, 19.27, and 34.05 RCW. WSR 07-01-091, § 51-50-003, filed 12/19/06, effective 7/1/07. Statutory Authority: RCW 19.27.020, 19.27.031, 19.27.074 and chapters 19.27 and 34.05 RCW. WSR 05-01-014, § 51-50-003, filed 12/2/04, effective 7/1/05. Statutory Authority: RCW 19.27.190, 19.27.020, and chapters 19.27 and 34.05 RCW. WSR 04-18-033, § 51-50-003, filed 8/25/04, effective 9/25/04. Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 04-01-108, § 51-50-003, filed 12/17/03, effective 7/1/04.

Wash. Admin. Code § 51-50-005 International Building Code requirements for barrier-free accessibility.

Chapter 11 and other International Building Code requirements for barrier-free access, including ICC A117.1-2017 and Appendix E, are adopted pursuant to chapters 70.92 and 19.27 RCW.

Pursuant to RCW 19.27.040, Chapter 11 and requirements affecting barrier-free access shall not be amended by local governments.

History

• Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 22-13-094, 23-12-103, and 23-20-023, § 51-50-005, filed 6/14/22, 6/7/23, and 9/25/23, effective 3/15/24. Statutory Authority: RCW 19.27.031 and chapters 19.27 and 34.05 RCW. WSR 13-04-067, § 51-50-005, filed 2/1/13, effective 7/1/13. Statutory Authority: RCW 19.27.074, 19.27.020, and chapters 70.92, 19.27, and 34.05 RCW. WSR 07-01-091, § 51-50-005, filed 12/19/06, effective 7/1/07. Statutory Authority: RCW 19.27.020, 19.27.031, 19.27.074 and chapters 19.27 and 34.05 RCW. WSR 05-01-014, § 51-50-005, filed 12/2/04, effective 7/1/05. Statutory Authority: RCW 19.27.190, 19.27.020, and chapters 19.27 and 34.05 RCW. WSR 04-18-033, § 51-50-005, filed 8/25/04, effective 9/25/04. Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 04-01-108, § 51-50-005, filed 12/17/03, effective 7/1/04.

Wash. Admin. Code § 51-50-007 Exceptions.

The exceptions and amendments to the International Building Code contained in the provisions of chapter 19.27 RCW shall apply in case of conflict with any of the provisions of these rules.

The provisions of this code do not apply to temporary growing structures used solely for the commercial production of horticultural plants including ornamental plants, flowers, vegetables, and fruits. "Temporary growing structure" means a structure that has the sides and roof covered with polyethylene, polyvinyl, or similar flexible synthetic material and is used to provide plants with either frost protection or increased heat retention. A temporary growing structure is not considered a building for purposes of this code.

The provisions of this code do not apply to the construction, alteration, or repair of temporary worker housing except as provided by rule adopted under chapter 70.114A RCW or chapter 37, Laws of 1998 (SB 6168). "Temporary worker housing" means a place, area, or piece of land where sleeping places or housing sites are provided by an employer for his or her employees or by another person, including a temporary worker housing operator, who is providing such accommodations for employees, for temporary, seasonal occupancy, and includes "labor camps" under RCW 70.54.110.

Codes referenced which are not adopted through RCW 19.27.031 or chapter 19.27A RCW shall not apply unless specifically adopted by the authority having jurisdiction. The 2021 International Existing Building Code is included in the adoption of this code in Section 101.4.7 and amended in WAC 51-50-480000.

History

• Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 22-13-094, 23-12-103, and 23-20-023, § 51-50-007, filed 6/14/22, 6/7/23, and 9/25/23, effective 3/15/24
• WSR 16-03-064, § 51-50-007, filed 1/19/16, effective 7/1/16. Statutory Authority: RCW 19.27.031 and chapters 19.27 and 34.05 RCW. WSR 13-04-067, § 51-50-007, filed 2/1/13, effective 7/1/13. Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 10-03-097, § 51-50-007, filed 1/20/10, effective 7/1/10. Statutory Authority: RCW 19.27.074, 19.27.020, and chapters 70.92, 19.27, and 34.05 RCW. WSR 07-01-091, § 51-50-007, filed 12/19/06, effective 7/1/07. Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 04-01-108, § 51-50-007, filed 12/17/03, effective 7/1/04.

Wash. Admin. Code § 51-50-008 Implementation.

The International Building Code adopted under chapter 51-50 WAC shall become effective in all counties and cities of this state on March 15, 2024.

History

• Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 23-23-102, § 51-50-008, filed 11/15/23, effective 3/16/24
• WSR 22-13-094, 23-12-103, and 23-20-023, § 51-50-008, filed 6/14/22, 6/7/23, and 9/25/23, effective 3/15/24
• WSR 21-11-066, § 51-50-008, filed 5/14/21, effective 6/14/21
• WSR 20-01-090, § 51-50-008, filed 12/12/19, effective 7/1/20
• WSR 16-03-064, § 51-50-008, filed 1/19/16, effective 7/1/16. Statutory Authority: RCW 19.27.031 and chapters 19.27 and 34.05 RCW. WSR 13-04-067, § 51-50-008, filed 2/1/13, effective 7/1/13. Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 10-03-097, § 51-50-008, filed 1/20/10, effective 7/1/10. Statutory Authority: RCW 19.27.074, 19.27.020, and chapters 70.92, 19.27, and 34.05 RCW. WSR 07-01-091, § 51-50-008, filed 12/19/06, effective 7/1/07. Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 04-01-108, § 51-50-008, filed 12/17/03, effective 7/1/04.

Wash. Admin. Code § 51-50-009 Reserved.

History

• Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 22-13-094, 23-12-103, and 23-20-023, § 51-50-009, filed 6/14/22, 6/7/23, and 9/25/23, effective 3/15/24
• WSR 16-03-064, § 51-50-009, filed 1/19/16, effective 7/1/16
• WSR 04-01-108, § 51-50-009, filed 12/17/03, effective 7/1/04.

Wash. Admin. Code § 51-50-0107 Section 107—Construction documents.

107.2 Construction documents. Construction documents shall be in accordance with Sections 107.2.1 through 107.2.9.

107.2.9 Nonstructural components. Construction documents shall indicate if structural support and anchoring documentation for nonstructural components is part of the design submittal or a deferred submittal. The construction documents for nonstructural components shall at a minimum identify the following:

1. All nonstructural components required by ASCE 7 Section 13.1.3 to have an importance factor of, Ip, of 1.5.

2. All mechanical equipment, fire sprinkler equipment, electrical equipment, and other nonstructural components required by ASCE 7 Section 13.1.3 Item 1 to be operational following a seismic event that require designated seismic systems per ASCE 7 Section 13.2.2 and special inspections per Section 1705.13.4.

History

• Statutory Authority: RCW 19.27.031, 19.27.074, and 19.27.540. WSR 23-02-073, 23-12-103, and 23-20-023, § 51-50-0107, filed 1/4/23, 6/7/23, and 9/25/23, effective 3/15/24.

Wash. Admin. Code § 51-50-0108 Temporary structures and uses.

108.1 General. The building official is authorized to issue a permit for temporary structures and temporary uses. Such permits shall be limited as to time of service, but shall not be permitted for more than 180 days. The building official is authorized to grant extensions for demonstrated cause.

| EXCEPTION: | The building official may authorize unheated tents and yurts under 500 square feet accommodating an R-1 Occupancy for recreational use as a temporary structure and allow them to be used indefinitely. | | --- | --- |

History

• Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 10-03-097, amended and recodified as § 51-50-0108, filed 1/20/10, effective 7/1/10. Statutory Authority: RCW 19.27.074, 19.27.020, and chapters 70.92, 19.27, and 34.05 RCW. WSR 07-01-091, § 51-50-0107, filed 12/19/06, effective 7/1/07.

Wash. Admin. Code § 51-50-0110 Reserved.

History

• Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 22-13-094, 23-12-103, and 23-20-023, § 51-50-0110, filed 6/14/22, 6/7/23, and 9/25/23, effective 3/15/24
• WSR 20-21-021, § 51-50-0110, filed 10/9/20, effective 11/9/20.

Wash. Admin. Code § 51-50-0200 Chapter 2—Definitions.

SECTION 202—DEFINITIONS.

ADULT FAMILY HOME. A dwelling, licensed by the state of Washington department of social and health services, in which a person or persons provide personal care, special care, room and board to more than one but not more than six adults who are not related by blood or marriage to the person or persons providing the services. An existing adult family home may provide services to up to eight adults upon approval from the department of social and health services in accordance with RCW 70.128.066.

ASSISTED LIVING FACILITY. A home or other institution, licensed by the state of Washington, providing housing, basic services and assuming general responsibility for the safety and well-being of residents under chapters 18.20 RCW and 388-78A WAC. These facilities may provide care to residents with symptoms consistent with dementia requiring additional security measures.

AUTOMATIC LOAD MANAGEMENT SYSTEM (ALMS). A system designed to manage electrical load across one or more EV Ready parking spaces.

BOTTLE FILLING STATION. A plumbing fixture connected to the potable water distribution system and sanitary drainage system that is designed and intended for filling personal use drinking water bottles or containers not less than 10 inches (254 mm) in height. Such fixtures can be separate from or integral to a drinking fountain and can incorporate a water filter and a cooling system for chilling the drinking water.

CHILD CARE. The care of children during any period of a 24-hour day.

CHILD CARE, FAMILY HOME. A child care facility, licensed by Washington state, located in the dwelling of the person or persons under whose direct care and supervision the child is placed, for the care of 16 or fewer children, including children who reside at the home.

CLIMATE ZONE. A geographical region that has been assigned climatic criteria as specified in the Washington State Energy Code.

CLUSTER. Clusters are multiple portable school classrooms separated by less than the requirements of the building code for separate buildings.

COMPOST. Biodegradable solid wastes that are separated for composting such as food waste, food soiled paper, and yard waste.

CUSTODIAL CARE. Assistance with day-to-day living tasks; such as assistance with cooking, taking medication, bathing, using toilet facilities, and other tasks of daily living. Custodial care includes persons receiving care who have the ability to respond to emergency situations and may receive limited verbal or physical assistance. These care recipients may evacuate at a slower rate and/or who have mental and psychiatric complications.

EFFICIENCY DWELLING UNIT. A dwelling unit where all permanent provisions for living, sleeping, eating and cooking are contained in a single room.

ELECTRIC VEHICLE (EV) CAPABLE PARKING SPACE. A parking space provided with a conduit, electrical panel and load capacity to support future installation of EV charging equipment.

ELECTRIC VEHICLE (EV) CHARGER. Off-board charging equipment used to charge electric vehicles.

ELECTRIC VEHICLE (EV) CHARGING STATION. EV Ready parking space with installed EV charger.

ELECTRIC VEHICLE (EV) READY PARKING SPACE. A parking space provided with a receptacle outlet allowing charging of electric vehicles.

ELECTRIC VEHICLE SUPPLY EQUIPMENT (EVSE). The conductors, including the ungrounded, grounded, and equipment grounding conductors, and the electric vehicle connectors, attachment plugs, personnel protection system, and all other fittings, devices, power outlets, or apparatus installed specifically for the purpose of transferring energy between the premises wiring and the electric vehicle.

HIGH-RISE BUILDING. A building with an occupied floor, located more than 75 feet (22,860 mm) above the lowest level of fire department vehicle access. For the purposes of this definition, an occupied roof with an occupant load of 50 or more is considered to be an occupied floor.

HOSPICE CARE CENTER. A building or portion thereof used on a 24-hour basis for the provision of hospice services to terminally ill inpatients.

LIMITED VERBAL OR PHYSICAL ASSISTANCE. Persons who, because of age, physical limitations, cognitive limitations, treatment or chemical dependency, and may not independently recognize, respond, or evacuate without limited verbal or physical assistance during an emergency situation. Verbal assistance includes prompting, giving, and repeating instructions. Physical assistance includes assistance with transfers to walking aids or mobility devices and assistance with egress.

LOFT. A space on an intermediate level or levels between the floor and ceiling of a Group R occupancy dwelling or sleeping unit, open on one or more sides to the room in which the loft is located, and in accordance with Section 420.14.

NIGHTCLUB. An A-2 Occupancy in which the aggregate area of concentrated use of unfixed chairs and standing space that is specifically designated and primarily used for dancing or viewing performers exceeds 350 square feet, excluding adjacent lobby areas. "Nightclub" does not include theaters with fixed seating, banquet halls, or lodge halls.

PORTABLE SCHOOL CLASSROOM. A prefabricated structure consisting of one or more rooms with direct exterior egress from the classroom(s). The structure is transportable in one or more sections and is designed to be used as an educational space with or without a permanent foundation. The structure shall be capable of being demounted and relocated to other locations as needs arise.

RECYCLED MATERIALS. Those solid wastes that are separated for recycling or reuse, such as papers, metals, and glass.

RESIDENTIAL SLEEPING SUITES. A unit that provides multiple rooms or spaces for up to five residents, includes provisions for sleeping and can include provisions for living, eating, sanitation, and kitchen facilities.

SMALL BUSINESS. Any business entity (including a sole proprietorship, corporation, partnership or other legal entity) which is owned and operated independently from all other businesses, which has the purpose of making a profit, and which has 50 or fewer employees.

STAGED EVACUATION. A method of emergency response, that engages building components and trained staff to provide occupant safety during an emergency. Emergency response involves moving or holding certain occupants at temporary locations for a brief period of time before evacuating the building. This response is used by ambulatory surgery facilities and assisted living facilities to protect the health and safety of fragile occupants and residents.

History

• Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 26-07-066, s 51-50-0200, filed 3/17/26, effective 4/17/26
• WSR 23-22-115, § 51-50-0200, filed 10/31/23, effective 3/15/24
• WSR 22-13-094, 23-12-103, and 23-20-023, § 51-50-0200, filed 6/14/22, 6/7/23, and 9/25/23, effective 3/15/24
• WSR 21-12-103, § 51-50-0200, filed 6/2/21, effective 7/3/21
• WSR 20-01-090, § 51-50-0200, filed 12/12/19, effective 7/1/20
• WSR 19-02-038, § 51-50-0200, filed 12/26/18, effective 7/1/19
• WSR 16-03-064, § 51-50-0200, filed 1/19/16, effective 7/1/16. Statutory Authority: RCW 19.27.074, 19.27.020, and 19.27.031. WSR 14-24-089, § 51-50-0200, filed 12/1/14, effective 5/1/15. Statutory Authority: RCW 19.27.031 and chapters 19.27 and 34.05 RCW. WSR 13-04-067, § 51-50-0200, filed 2/1/13, effective 7/1/13. Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 10-03-097, § 51-50-0200, filed 1/20/10, effective 7/1/10. Statutory Authority: RCW 19.27.190, 19.27.020, and chapters 19.27 and 34.05 RCW. WSR 08-01-110, § 51-50-0200, filed 12/18/07, effective 4/1/08. Statutory Authority: RCW 19.27.074, 19.27.020, and chapters 70.92, 19.27, and 34.05 RCW. WSR 07-01-091, § 51-50-0200, filed 12/19/06, effective 7/1/07. Statutory Authority: RCW 19.27.020, 19.27.031, 19.27.074, and chapters 19.27 and 34.05 RCW. WSR 05-24-070, § 51-50-0200, filed 12/5/05, effective 7/1/06. Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 04-01-108, § 51-50-0200, filed 12/17/03, effective 7/1/04.

Wash. Admin. Code § 51-50-0303 Section 303—Assembly Group A.

303.4 Assembly Group A-3. Group A-3 occupancy includes assembly uses intended for worship, recreation or amusement and other assembly uses not classified elsewhere in Group A including, but not limited to:

• Amusement arcades;

• Art galleries more than 3,000 square feet (279 m2);

• Bowling alleys;

• Community halls;

• Courtrooms;

• Dance halls (not including food or drink consumption);

• Exhibition halls;

• Funeral parlors;

• Greenhouses for the conservation and exhibition of plants that provide public access;

• Gymnasiums (without spectator seating);

• Indoor swimming pools (without spectator seating);

• Indoor tennis courts (without spectator seating);

• Lecture halls;

• Libraries;

• Museums;

• Places of religious worship;

• Pool and billiard parlors;

• Waiting areas in transportation terminals.

History

• Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 23-23-102, § 51-50-0303, filed 11/15/23, effective 3/16/24
• WSR 20-01-090, § 51-50-0303, filed 12/12/19, effective 7/1/20.

Wash. Admin. Code § 51-50-0305 Section 305—Educational Group E.

305.2.4 Family home child care. Family home child care licensed by Washington state for the care of 16 or fewer children shall be classified as Group R-3 or shall comply with the International Residential Code.

History

• Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 26-07-066, s 51-50-0305, filed 3/17/26, effective 4/17/26. Statutory Authority: RCW 19.27.031 and chapters 19.27 and 34.05 RCW. WSR 13-04-067, § 51-50-0305, filed 2/1/13, effective 7/1/13. Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 10-03-097, § 51-50-0305, filed 1/20/10, effective 7/1/10. Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 04-01-108, § 51-50-0305, filed 12/17/03, effective 7/1/04.

Wash. Admin. Code § 51-50-0306 Section 306—Factory Group F.

306.2 Moderate-hazard factory industrial, Group F-1. Factory industrial uses that are not classified as factory industrial F-2 low hazard shall be classified as F-1 moderate hazard and shall include, but not be limited to, the following:

Aircraft (manufacturing, not to include repair)

Appliances

Athletic equipment

Automobiles and other motor vehicles

Bakeries

Beverages: Over 16 percent alcohol content

Bicycles

Boats

Brooms or brushes

Business machines

Cameras and photo equipment

Canvas or similar fabric

Carpets and rugs (includes cleaning)

Clothing

Construction and agricultural machinery

Disinfectants

Dry cleaning and dyeing

Electric generation plants

Electronics

Energy storage systems (ESS) in dedicated use buildings

Engines (including rebuilding)

Food processing establishments and commercial kitchens not associated with restaurants, cafeterias and similar dining facilities more than 2,500 square feet (232m2) in area

Furniture

Hemp products

Jute products

Laundries

Leather products

Machinery

Marijuana processing

Metals

Millwork (sash and door)

Motion pictures and television filming (without spectators)

Musical instruments

Optical goods

Paper mills or products

Photographic film

Plastic products

Printing or publishing

Recreational vehicles

Refuse incineration

Shoes

Soaps and detergents

Textiles

Tobacco

Trailers

Upholstering

Water/sewer treatment facilities

Wood; distillation

Woodworking (cabinet)

History

• Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 22-13-094, 23-12-103, and 23-20-023, § 51-50-0306, filed 6/14/22, 6/7/23, and 9/25/23, effective 3/15/24
• WSR 16-03-064, § 51-50-0306, filed 1/19/16, effective 7/1/16.

Wash. Admin. Code § 51-50-0308 Section 308—Institutional Group I.

308.2 Institutional Group I-1. Institutional Group I-1 occupancy shall include buildings, structures or portions thereof for more than 16 persons, excluding staff, who reside on a 24-hour basis in a supervised environment and receive custodial care. Buildings of Group I-1 shall be classified as one of the occupancy conditions specified in Section 308.2.1 or 308.2.2 and shall comply with Section 420. This group shall include, but not be limited to, the following:

Alcohol and drug centers;

Assisted living facilities as licensed by Washington state under chapter 388-78A WAC;

Congregate care facilities;

Group homes;

Halfway houses;

Residential board and care facilities;

Residential treatment facilities as licensed by Washington state under chapter 246-337 WAC;

Social rehabilitation facilities.

308.2.5 Adult family homes. Adult family homes licensed by Washington state shall be classified as Group R-3 or shall comply with the International Residential Code.

308.2.6 Assisted living facilities. Assisted living facilities as licensed by Washington state under chapter 388-78A WAC shall be classified as Group I-1, Condition 2.

308.3 Institutional Group I-2. Institutional Group I-2 occupancy shall include buildings and structures used for medical care on a 24-hour basis for more than five persons who are incapable of self-preservation. This group shall include, but not be limited to, the following:

Foster care facilities.

Detoxification facilities.

Hospice care centers.

Hospitals.

Nursing homes.

Psychiatric hospitals.

308.5.5 Family home child care. Family home child care licensed by Washington state for the care of 16 or fewer children shall be classified as Group R-3 or shall comply with the International Residential Code.

History

• Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 26-07-066, s 51-50-0308, filed 3/17/26, effective 4/17/26
• WSR 23-22-115, § 51-50-0308, filed 10/31/23, effective 3/15/24
• WSR 22-13-094, 23-12-103, and 23-20-023, § 51-50-0308, filed 6/14/22, 6/7/23, and 9/25/23, effective 3/15/24
• WSR 20-21-021, § 51-50-0308, filed 10/9/20, effective 11/9/20
• WSR 20-01-090, § 51-50-0308, filed 12/12/19, effective 7/1/20
• WSR 16-03-064, § 51-50-0308, filed 1/19/16, effective 7/1/16. Statutory Authority: RCW 19.27.031 and chapters 19.27 and 34.05 RCW. WSR 13-04-067, § 51-50-0308, filed 2/1/13, effective 7/1/13. Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 10-03-097, § 51-50-0308, filed 1/20/10, effective 7/1/10. Statutory Authority: RCW 19.27.074, 19.27.020, and chapters 70.92, 19.27, and 34.05 RCW. WSR 07-01-091, § 51-50-0308, filed 12/19/06, effective 7/1/07. Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 04-01-108, § 51-50-0308, filed 12/17/03, effective 7/1/04.

Wash. Admin. Code § 51-50-0309 Section 309—Mercantile Group M.

309.1 Mercantile Group M. Mercantile Group M occupancy includes, among others, the use of a building or structure or a portion thereof for the display and sale of merchandise, and involves stocks of goods, wares or merchandise incidental to such purposes and where the public has access. Mercantile occupancies shall include, but not be limited to, the following:

• Art galleries 3,000 square feet or less;

• Department stores;

• Drug stores;

• Markets;

• Greenhouses for display and sale of plants that provide public access;

• Motor fuel-dispensing facilities;

• Retail or wholesale stores;

• Sales rooms.

History

• Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 22-13-094, 23-12-103, and 23-20-023, § 51-50-0309, filed 6/14/22, 6/7/23, and 9/25/23, effective 3/15/24
• WSR 20-01-090, § 51-50-0309, filed 12/12/19, effective 7/1/20.

Wash. Admin. Code § 51-50-0310 Section 310—Residential Group R.

310.3 Residential Group R-2. Residential occupancies containing sleeping units or more than two dwelling units where the occupants are primarily permanent in nature, including:

Apartment houses

Congregate living facilities (nontransient) with more than 16 occupants

Boarding houses (nontransient)

Convents

Dormitories

Fraternities and sororities

Monasteries

Hotels (nontransient)

Live/work units

Motels (nontransient)

Vacation timeshare properties

310.4.3 Adult family homes, family home child care. Adult family homes and family home child care facilities that are within a single-family home are permitted to comply with the International Residential Code.

310.4.4 Foster family care homes. Foster family care homes licensed by Washington state are permitted to comply with the International Residential Code, as an accessory use to a dwelling, for six or fewer children including those of the resident family.

History

• Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 23-22-115, § 51-50-0310, filed 10/31/23, effective 3/15/24
• WSR 22-13-094, 23-12-103, and 23-20-023, § 51-50-0310, filed 6/14/22, 6/7/23, and 9/25/23, effective 3/15/24
• WSR 21-06-035, § 51-50-0310, filed 2/23/21, effective 3/26/21
• WSR 16-03-064, § 51-50-0310, filed 1/19/16, effective 7/1/16. Statutory Authority: RCW 19.27.031 and chapters 19.27 and 34.05 RCW. WSR 13-04-067, § 51-50-0310, filed 2/1/13, effective 7/1/13. Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 10-03-097, § 51-50-0310, filed 1/20/10, effective 7/1/10. Statutory Authority: RCW 19.27.190, 19.27.020, and chapters 19.27 and 34.05 RCW. WSR 08-01-110, § 51-50-0310, filed 12/18/07, effective 4/1/08. Statutory Authority: RCW 19.27.074, 19.27.020, and chapters 70.92, 19.27, and 34.05 RCW. WSR 07-01-091, § 51-50-0310, filed 12/19/06, effective 7/1/07. Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 04-01-108, § 51-50-0310, filed 12/17/03, effective 7/1/04.

Wash. Admin. Code § 51-50-0312 Reserved.

History

• Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 20-01-090, § 51-50-0312, filed 12/12/19, effective 7/1/20
• WSR 16-06-108 and 16-03-064, § 51-50-0312, filed 3/1/16 and 1/19/16, effective 7/1/16.

Wash. Admin. Code § 51-50-0403 Section 403—High-rise buildings.

403.4.8.3 Standby power loads. The following are classified as standby power loads:

1. Ventilation and automatic fire detection equipment for smokeproof enclosures.

2. Elevators.

3. Where elevators are provided in a high-rise building for accessible means of egress, fire service access or occupant self-evacuation, the standby power system shall also comply with Sections 1009.4, 3007 or 3008, as applicable.

4. Sump pumps required by ASME A17.1 serving pit drains at the bottom of elevator hoistways of fire service access or occupant evacuation elevators.

403.5.4 Smokeproof enclosures. Every required interior exit stairway serving floors more than 75 feet (22,860 mm) above the lowest level of fire department vehicle access shall be a smokeproof enclosure in accordance with Sections 909.20 and 1023.12. Where interior exit stairways and ramps are pressurized in accordance with Section 909.20.5, the smoke control pressurization system shall comply with the requirements specified in Section 909.6.3.

History

• Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 23-23-102, § 51-50-0403, filed 11/15/23, effective 3/16/24
• WSR 22-13-094, 23-12-103, and 23-20-023, § 51-50-0403, filed 6/14/22, 6/7/23, and 9/25/23, effective 3/15/24
• WSR 20-01-090, § 51-50-0403, filed 12/12/19, effective 7/1/20
• WSR 19-02-038, § 51-50-0403, filed 12/26/18, effective 7/1/19
• WSR 16-03-064, § 51-50-0403, filed 1/19/16, effective 7/1/16. Statutory Authority: RCW 19.27.031 and chapters 19.27 and 34.05 RCW. WSR 13-04-067, § 51-50-0403, filed 2/1/13, effective 7/1/13. Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 10-03-097, § 51-50-0403, filed 1/20/10, effective 7/1/10.

Wash. Admin. Code § 51-50-0405 Section 405—Underground buildings.

405.7.2 Smokeproof enclosure. Every required stairway serving floor levels more than 30 feet (9144 mm) below the finished floor of its level of exit discharge shall comply with the requirements for a smokeproof enclosure as provided in Sections 909.20 and 1023.12. Where interior exit stairways and ramps are pressurized in accordance with Section 909.20.5, the smoke control pressurization system shall comply with the requirements specified in Section 909.6.3.

History

• Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 22-13-094, 23-12-103, and 23-20-023, § 51-50-0405, filed 6/14/22, 6/7/23, and 9/25/23, effective 3/15/24.

Wash. Admin. Code § 51-50-0406 Reserved.

History

• Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 10-03-097, § 51-50-0406, filed 1/20/10, effective 7/1/10. Statutory Authority: RCW 19.27.074, 19.27.020, and chapters 70.92, 19.27, and 34.05 RCW. WSR 07-01-091, § 51-50-0406, filed 12/19/06, effective 7/1/07.

Wash. Admin. Code § 51-50-0407 Reserved.

History

• Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 22-13-094, 23-12-103, and 23-20-023, § 51-50-0407, filed 6/14/22, 6/7/23, and 9/25/23, effective 3/15/24
• WSR 20-01-090, § 51-50-0407, filed 12/12/19, effective 7/1/20
• WSR 16-03-064, § 51-50-0407, filed 1/19/16, effective 7/1/16. Statutory Authority: RCW 19.27.031 and chapters 19.27 and 34.05 RCW. WSR 13-04-067, § 51-50-0407, filed 2/1/13, effective 7/1/13. Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 10-03-097, § 51-50-0407, filed 1/20/10, effective 7/1/10. Statutory Authority: RCW 19.27.074, 19.27.020, and chapters 70.92, 19.27, and 34.05 RCW. WSR 07-01-091, § 51-50-0407, filed 12/19/06, effective 7/1/07. Statutory Authority: RCW 19.27.020, 19.27.031, 19.27.074 and chapters 19.27 and 34.05 RCW. WSR 05-01-014, § 51-50-0407, filed 12/2/04, effective 7/1/05.

Wash. Admin. Code § 51-50-0412 Section 412—Aircraft-related occupancies.

412.2.2.1 Stairways. Stairways in airport traffic control towers shall be in accordance with Section 1011. Exit stairways shall be smokeproof enclosures complying with one of the alternatives provided in Section 909.20. Where interior exit stairways and ramps are pressurized in accordance with Section 909.20.5, the smoke control pressurization system shall comply with the requirements specified in Section 909.6.3.

| EXCEPTION: | Stairways in airport traffic control towers are not required to comply with Section 1011.12. | | --- | --- |

[F] 412.7.3 Means of egress. The means of egress from heliports, helipads and helistops shall comply with the provisions of Chapter 10. Landing areas located on buildings or structures shall have two or more exits or access to exits. For landing areas less than 60 feet in length or less than 2,000 square feet (186 m2) in area, the second means of egress is permitted to be a fire escape, alternating tread device or ladder leading to the floor below. On Group I-2 roofs with heliports or helipads and helistops, rooftop structures enclosing exit stair enclosures or elevator shafts shall be enclosed with fire barriers and opening protectives that match the rating of their respective shaft enclosures below.

Reviser's note: The brackets and enclosed material in the text of the above section occurred in the copy filed by the agency.

Wash. Admin. Code § 51-50-0420 Section 420—Groups I-1, R-1, R-2, R-3, and R-4.

420.2 Separation walls. Walls separating dwelling units in the same building, walls separating sleeping units in the same building and walls separating dwelling or sleeping units from other occupancies contiguous to them in the same building shall be constructed as fire partitions in accordance with Section 708. Buildings containing multiple sleeping units with common use or central kitchens shall not be classified as a single dwelling.

420.12 Adult family homes. This section shall apply to all newly constructed adult family homes and all existing single-family homes being converted to adult family homes. This section shall not apply to those adult family homes licensed by the state of Washington department of social and health services prior to July 1, 2001.

420.12.1 Sleeping room classification. Each sleeping room in an adult family home shall be classified as one of the following:

1. Type S - Where the means of egress contains stairs, elevators or platform lifts.

2. Type NS1 - Where one means of egress is at grade level or a ramp constructed in accordance with Section 1012 is provided.

3. Type NS2 - Where two means of egress are at grade level or ramps constructed in accordance with Section 1012 are provided.

420.12.2 Types of locking devices and door activation. All bedrooms and bathroom doors shall be openable from the outside when locked.

Every closet door shall be readily openable from the inside.

Operable parts of door handles, pulls, latches, locks and other devices installed in adult family homes shall be operable with one hand and shall not require tight grasping, pinching, or twisting of the wrist. Pocket doors shall have graspable hardware available when in the closed or open position.

The force required to activate operable parts shall be 5.0 pounds (22.2 N) maximum. Required exit door(s) shall have no additional locking devices. Required exit door hardware shall unlock inside and outside mechanisms when exiting the building allowing reentry into the adult family home without the use of a key, tool or special knowledge.

420.12.3 Smoke and carbon monoxide alarm requirements. Alarms shall be installed in such a manner so that the detection device warning is audible from all areas of the dwelling upon activation of a single alarm.

420.12.4 Escape windows and doors. Every sleeping room shall be provided with emergency escape and rescue windows as required by Section 1031. No alternatives to the sill height such as steps, raised platforms or other devices placed by the openings will be approved as meeting this requirement.

420.12.5 Grab bar general requirements. Where facilities are designated for use by adult family home clients, grab bars for water closets, bathtubs and shower stalls shall be installed according to ICC A117.1.

420.12.6 Shower stalls. Where provided to meet the requirements for bathing facilities, the minimum size of shower stalls for an adult family home shall be 30 inches deep by 48 inches (760 mm by 1220 mm) long.

420.13 Licensed care cooking facilities. In Group I-1, Condition 2 assisted living facilities licensed under chapter 388-78A WAC and residential treatment facilities licensed under chapter 246-337 WAC, rooms or spaces that contain a cooking facility with domestic cooking appliances shall be permitted to be open to the corridor where all of the following criteria are met:

1. The number of care recipients housed in the smoke compartment is not greater than 30.

2. The number of care recipients served by the cooking facility is not greater than 30.

3. Only one cooking facility area is permitted in a smoke compartment.

4. The types of domestic cooking appliances permitted are limited to ovens, cooktops, ranges, warmers and microwaves.

5. The corridor is a clearly identified space delineated by construction or floor pattern, material or color.

6. The space containing the domestic cooking facility shall be arranged so as not to obstruct access to the required exit.

7. A domestic cooking hood installed and constructed in accordance with Section 505 of the International Mechanical Code is provided over the cooktop or range.

8. The domestic cooking hood provided over the cooktop or range shall be equipped with an automatic fire-extinguishing system of a type recognized for protection of domestic cooking equipment. Preengineered automatic extinguishing systems shall be tested in accordance with UL 300A and listed and labeled for the intended application. The system shall be installed in accordance with this code, its listing and the manufacturer's instructions.

9. A manual actuation device for the hood suppression system shall be installed in accordance with Sections 904.13.1 and 904.13.2.

10. An interlock device shall be provided such that upon activation of the hood suppression system, the power or fuel supply to the cooktop or range will be turned off.

11. A shut-off for the fuel and electrical power supply to the cooking equipment shall be provided in a location that is accessible only to staff.

12. A timer shall be provided that automatically deactivates the cooking appliances within a period of not more than 120 minutes.

13. A portable fire extinguisher shall be installed in accordance with Section 906 of the International Fire Code.

420.14 Lofts. Where provided in Group R occupancies, lofts shall comply with this code as modified by Sections 420.14.1 through 420.14.5. Lofts constructed in compliance with this section shall be considered a portion of the story below. Such lofts shall not contribute to either the building area or number of stories as regulated by Section 503.1. The loft floor area shall be included in determining the fire area.

| EXCEPTION: | Lofts need not comply with Section 420.14 where they meet any of the following conditions: | | --- | --- | | | 1. The loft has a maximum depth of less than 3 feet (914 mm). | | | 2. The loft has a floor area of less than 35 square feet (3.3 m2). | | | 3. The loft is not provided with a permanent means of egress. |

420.14.1 Loft limitations.Lofts shall comply with the following conditions:

1. The loft floor area shall be less than 70 square feet (6.5 m2).

2. The loft ceiling height shall not exceed 7 feet (2134 mm) for more than one-half of the loft floor area.

The provisions of Sections 420.14.2 through 420.14.5 shall not apply to lofts that do not comply with Items 1 and 2.

420.14.2 Loft ceiling height. The ceiling height below a loft shall not be less than 7 feet (2134 mm). The ceiling height above the finished floor of the loft shall not be less than 3 feet (914 mm). Portions of the loft with a sloped ceiling measuring less than 3 feet (914 mm) from the finished floor to the finished ceiling shall not contribute to the loft floor area.

420.14.3 Loft area. The aggregate area of all lofts and mezzanines within a room shall comply with Section 505.2.1.

| EXCEPTION: | The area of a single loft shall not be greater than two-thirds of the area of the room in which it is located, provided that no other lofts or mezzanines are open to the room in which the loft is located. | | --- | --- |

420.14.4 Permanent egress for lofts. Where a permanent means of egress is provided for lofts, the means of egress shall comply with Chapter 10 as modified by Section 420.14.4.1.

420.14.4.1 Ceiling height at loft means of egress. A minimum ceiling height of 3 feet shall be provided for the entire width of the means of egress from the loft.

420.14.5 Smoke alarms. Single- or multiple-station smoke alarms shall be installed in all lofts in accordance with Section 907.2.11.1 or 907.2.11.2.

History

• Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 23-22-115, § 51-50-0420, filed 10/31/23, effective 3/15/24
• WSR 22-13-094, 23-12-103, and 23-20-023, § 51-50-0420, filed 6/14/22, 6/7/23, and 9/25/23, effective 3/15/24
• WSR 20-01-090, § 51-50-0420, filed 12/12/19, effective 7/1/20
• WSR 16-03-064, § 51-50-0420, filed 1/19/16, effective 7/1/16. Statutory Authority: RCW 19.27.031 and chapters 19.27 and 34.05 RCW. WSR 13-04-067, § 51-50-0420, filed 2/1/13, effective 7/1/13. Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 10-03-097, § 51-50-0420, filed 1/20/10, effective 7/1/10.

Wash. Admin. Code § 51-50-0422 Section 422—Ambulatory care facilities.

422.3.1 Means of egress. Where ambulatory care facilities require smoke compartmentation in accordance with Section 422.3, the fire safety evacuation plans provided in accordance with Section 1002.2 shall identify the building components necessary to support Sections 403 and 404 of the International Fire Code.

History

• Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 20-01-090, § 51-50-0422, filed 12/12/19, effective 7/1/20
• WSR 16-03-064, § 51-50-0422, filed 1/19/16, effective 7/1/16. Statutory Authority: RCW 19.27.031 and chapters 19.27 and 34.05 RCW. WSR 13-04-067, § 51-50-0422, filed 2/1/13, effective 7/1/13. Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 10-03-097, § 51-50-0422, filed 1/20/10, effective 7/1/10.

Wash. Admin. Code § 51-50-0427 Reserved.

History

• Statutory Authority: RCW 19.27.077, 19.27.031 and 19.27.074. WSR 21-14-074 and 21-16-063, § 51-50-0427, filed 7/6/21 and 7/29/21, effective 8/6/21 and 8/29/21. Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 16-03-064, § 51-50-0427, filed 1/19/16, effective 7/1/16.

Wash. Admin. Code § 51-50-0429 Section 429—Electric vehicle charging infrastructure.

429.1 General. The provisions of this section shall apply to the construction of new buildings and accessory structures, including parking lots and parking garages.

Electric vehicle supply equipment (EVSE) shall be installed in accordance with applicable requirements of chapter 19.28 RCW and the National Electrical Code, Article 625.

| EXCEPTION: | Electric vehicle charging infrastructure is not required if any of the following conditions are met: | | --- | --- | | | 1. There is no public utility or commercial power supply. | | | 2. Dwelling units without garages or other on-site parking. |

429.2 Electric vehicle (EV) charging infrastructure. Buildings and accessory structures shall be provided with EV charging stations, EV-Ready parking spaces, and EV-capable parking spaces in accordance with Table 429.2. Calculations shall be rounded up to the nearest whole number. Where a building contains more than one occupancy, the electric vehicle charging infrastructure percentages of Table 429.2 shall be applied to the number of spaces required for each occupancy.

| EXCEPTIONS: | 1. Except for Group A, Group E, and Group M occupancies, on-site parking with less than 10 parking spaces shall not be required to comply with Section 429.2. | | --- | --- | | | 2. Group A, Group E, and Group M occupancies shall comply with one of the following, whichever is greater: | | | 2.1. The provisions of Section 429.2 shall apply only to designated employee parking spaces. | | | 2.2. One of each 200 parking spaces or fraction thereof shall be EV Ready. One of each 200 parking spaces or fraction thereof shall be an EV Charging Station. |

Table 429.2

Electric Vehicle Charging Infrastructure

| Occupancy | Number of EV Charging Stations | Number of EV-Ready Parking Spaces | Number of EV-Capable Parking Spaces | | | --- | --- | --- | --- | --- | | Group A, B, E, F, H, I, M, and S occupancies | 10% of total parking spaces | 10% of total parking spaces | 10% of total parking spaces | | | Group R occupancies | | | | | | | Buildings that do not contain more than two dwelling units | Not required | One for each dwelling unit | Not required | | | Dwelling units with private garages | Not required | One for each dwelling unit | Not required | | All other Group R occupancies | 10% of total parking spaces | 25% of total parking spaces | 10% of total parking spaces | |

429.2.1 EV charging stations and EV-Ready parking spaces. A minimum of 40-ampere dedicated 208/240-volt branch circuit shall be installed for each EV Ready parking space and each EV Charging Station. The branch circuits shall terminate at a receptacle outlet or EV charger in close proximity to the proposed location of the EV Ready parking space or the EV Charging Station.

429.2.2 EV-Capable parking spaces. A listed raceway capable of accommodating a minimum of 40-ampere dedicated 208/240-volt branch circuit shall be installed for each EV-Capable parking space. The raceway shall terminate into a cabinet, box or other enclosure in close proximity to the proposed location of the EV-Capable parking space. Raceways and related components that are planned to be installed underground, and in enclosed, inaccessible or concealed areas and spaces, shall be installed at the time of original construction.

429.3 Electrical room(s) and equipment. Electrical room(s) and/or dedicated electrical equipment shall be sized to accommodate the requirements of Section 429.

The electrical service and the electrical system, including any on-site distribution transformer(s), shall have sufficient capacity to simultaneously charge all EVs at all required EV Charging Stations, EV Ready parking spaces, and EV-Capable parking spaces at a minimum of 40-amperes each.

| EXCEPTION: | Automatic Load Management System (ALMS) may be used to adjust the maximum electrical capacity required for the EV-Ready and EV-Capable parking spaces. The ALMS must be designed to allocate charging capacity among multiple future EV Charging Stations at a minimum of 16 amperes per EV charger. | | --- | --- |

429.4 Electric vehicle charging infrastructure for accessible parking spaces. Ten percent of the accessible parking spaces, rounded to the next whole number, shall be EV Charging Stations. Additional 10 percent of the accessible parking spaces, rounded to the next whole number, shall be EV Ready. Not fewer than one for each type of EV charging system shall be accessible.

The electric vehicle charging infrastructure may also serve adjacent parking spaces not designated as accessible parking. A maximum of 10 percent of the accessible parking spaces, rounded to the next whole number, are allowed to be included in the total number of electric vehicle parking spaces required under Section 429.2.

History

• Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 22-13-094, 23-12-103, and 23-20-023, § 51-50-0429, filed 6/14/22, 6/7/23, and 9/25/23, effective 3/15/24. Statutory Authority: RCW 19.27.077, 19.27.031 and 19.27.074. WSR 21-16-063, § 51-50-0429, filed 7/29/21, effective 8/29/21.

Wash. Admin. Code § 51-50-0430 Section 430—Recycled materials.

430.1 Recyclable materials, compost, and solid waste storage. Space shall be provided for the storage of recycled materials, compost, and solid waste for all new buildings.

| EXCEPTION: | Group R-3 and Group U Occupancies. | | --- | --- |

The storage area shall be designed to meet the needs of the occupancy, efficiency of pickup, and be available to occupants and haulers.

History

• Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 23-23-102, § 51-50-0430, filed 11/15/23, effective 3/16/24
• WSR 22-13-094, 23-12-103, and 23-20-023, § 51-50-0430, filed 6/14/22, 6/7/23, and 9/25/23, effective 3/15/24.

Wash. Admin. Code § 51-50-0502 Reserved.

History

• Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 10-03-097, § 51-50-0502, filed 1/20/10, effective 7/1/10. Statutory Authority: RCW 19.27.074, 19.27.020, and chapters 70.92, 19.27, and 34.05 RCW. WSR 07-01-091, § 51-50-0502, filed 12/19/06, effective 7/1/07.

Wash. Admin. Code § 51-50-0503 Section 503—General building height and area limitations.

503.1.4.1 Enclosure of occupied roof areas. Elements or structures enclosing the occupied roof areas shall not extend more than 48 inches (1220 mm) above the surface of the occupied roof.

| EXCEPTIONS: | 1. Penthouses constructed in accordance with Section 1511.2 and towers, domes, spires, and cupolas constructed in accordance with Section 1511.5. | | --- | --- | | | 2. High rise buildings. |

503.1.4.2 Guards. Occupied roofs shall have guards in accordance with Section 1015.2.

History

• Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 22-13-094, 23-12-103, and 23-20-023, § 51-50-0503, filed 6/14/22, 6/7/23, and 9/25/23, effective 3/15/24
• WSR 20-01-090, § 51-50-0503, filed 12/12/19, effective 7/1/20
• WSR 16-03-064, § 51-50-0503, filed 1/19/16, effective 7/1/16.

Wash. Admin. Code § 51-50-0504 Section 504—Building height and number of stories.

Table 504.3

Allowable Building Height in Feet Above Grade Planea

| Occupancy Classification | Type of Construction | | | | | | | | | | | | | | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | | See Footnotes | Type I | Type II | Type III | Type IV | Type V | | | | | | | | | | A | B | A | B | A | B | A | B | C | HT | A | B | | | | A, B, E, F, M, S, U | NSb | UL | 160 | 65 | 55 | 65 | 55 | 65 | 65 | 65 | 65 | 50 | 40 | | S | UL | 180 | 85 | 75 | 85 | 75 | 270 | 180 | 85 | 85 | 70 | 60 | | | H-1, H-2, H-3, H-5 | NSc,d | UL | 160 | 65 | 55 | 65 | 55 | 120 | 90 | 65 | 65 | 50 | 40 | | S | | | | | | | | | | | | | | | H-4 | NSc,d | UL | 160 | 65 | 55 | 65 | 55 | 65 | 65 | 65 | 65 | 50 | 40 | | S | UL | 180 | 85 | 75 | 85 | 75 | 140 | 100 | 85 | 85 | 70 | 60 | | | I-1 Condition 1, I-3 | NSd,e | UL | 160 | 65 | 55 | 65 | 55 | 65 | 65 | 65 | 65 | 50 | 40 | | S | UL | 180 | 85 | 75 | 85 | 75 | 180 | 120 | 85 | 85 | 70 | 60 | | | I-1 Condition 2, I-2 | NSd,e,f | UL | 160 | 65 | 55 | 65 | 55 | 65 | 65 | 65 | 65 | 50 | 40 | | Si | UL | 180 | 85 | | | | | | | | | | | | I-4 | NSd,g | UL | 160 | 65 | 55 | 65 | 55 | 65 | 65 | 65 | 65 | 50 | 40 | | S | UL | 180 | 85 | 75 | 85 | 75 | 180 | 120 | 85 | 85 | 70 | 60 | | | Rh | NSd | UL | 160 | 65 | 55 | 65 | 55 | 65 | 65 | 65 | 65 | 50 | 40 | | S13D | 60 | 60 | 60 | 60 | 60 | 60 | 60 | 60 | 60 | 60 | 50 | 40 | | | S13R | 60 | 60 | 60 | 60 | 60 | 60 | 60 | 60 | 60 | 60 | 60 | 60 | | | S | UL | 180 | 85 | 75 | 85 | 75 | 270 | 180 | 85 | 85 | 70 | 60 | |

| For SI: 1 foot = 304.8 mm. | | | | --- | --- | --- | | UL = Unlimited; NS = Buildings not equipped throughout with an automatic sprinkler system; S = Buildings equipped throughout with an automatic sprinkler system installed in accordance with Section 903.3.1.1; S13R = Buildings equipped throughout with an automatic sprinkler system installed in accordance with Section 903.3.1.2; S13D = Buildings equipped throughout with an automatic sprinkler system installed in accordance with Section 903.3.1.3. | | | | | a | See Chapters 4 and 5 for specific exceptions to the allowable height in this chapter. | | | b | See Section 903.2 for the minimum thresholds for protection by an automatic sprinkler system for specific occupancies. | | | c | New Group H occupancies are required to be protected by an automatic sprinkler system in accordance with Section 903.2.5. | | | d | The NS value is only for use in evaluation of existing building height in accordance with the International Existing Building Code. | | | e | New Group I-1 and I-3 occupancies are required to be protected by an automatic sprinkler system in accordance with Section 903.2.6. For new Group I-1 occupancies Condition 1, see Exception 1 of Section 903.2.6. | | | f | New and existing Group I-2 occupancies are required to be protected by an automatic sprinkler system in accordance with Section 903.2.6 and Section 1103.5 of the International Fire Code. | | | g | For new Group I-4 occupancies, see Exceptions 2 and 3 of Section 903.2.6. | | | h | New Group R occupancies are required to be protected by an automatic sprinkler system in accordance with Section 903.2.8. | | | i | I-1, Condition 2 Assisted living facilities licensed in accordance with chapter 388-78A WAC and residential treatment facilities as licensed by Washington state under chapter 246-337 WAC shall be permitted to use the allowable height above grade plane for Group R-2 occupancies. |

Table 504.4

Allowable Number of Stories Above Grade Planea,b

| Occupancy Classification | Type of Construction | | | | | | | | | | | | | | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | | See Footnotes | Type I | Type II | Type III | Type IV | Type V | | | | | | | | | | A | B | A | B | A | B | A | B | C | HT | A | B | | | | A-1 | NS | UL | 5 | 3 | 2 | 3 | 2 | 3 | 3 | 3 | 3 | 2 | 1 | | S | UL | 6 | 4 | 3 | 4 | 3 | 9 | 6 | 4 | 4 | 3 | 2 | | | A-2 | NS | UL | 11 | 3 | 2 | 3 | 2 | 3 | 3 | 3 | 3 | 2 | 1 | | S | UL | 12 | 4 | 3 | 4 | 3 | 18 | 12 | 6 | 4 | 3 | 2 | | | A-3 | NS | UL | 11 | 3 | 2 | 3 | 2 | 3 | 3 | 3 | 3 | 2 | 1 | | S | UL | 12 | 4 | 3 | 4 | 3 | 18 | 12 | 6 | 4 | 3 | 2 | | | A-4 | NS | UL | 11 | 3 | 2 | 3 | 2 | 3 | 3 | 3 | 3 | 2 | 1 | | S | UL | 12 | 4 | 3 | 4 | 3 | 18 | 12 | 6 | 4 | 3 | 2 | | | A-5 | NS | UL | UL | UL | UL | UL | UL | 1 | 1 | 1 | UL | UL | UL | | S | UL | UL | UL | UL | UL | UL | UL | UL | UL | UL | UL | UL | | | B | NS | UL | 11 | 5 | 3 | 5 | 3 | 5 | 5 | 5 | 5 | 3 | 2 | | S | UL | 12 | 6 | 4 | 6 | 4 | 18 | 12 | 9 | 6 | 4 | 3 | | | E | NS | UL | 5 | 3 | 2 | 3 | 2 | 3 | 3 | 3 | 3 | 1 | 1 | | S | UL | 6 | 4 | 3 | 4 | 3 | 9 | 6 | 4 | 4 | 2 | 2 | | | F-1 | NS | UL | 11 | 4 | 2 | 3 | 2 | 3 | 3 | 3 | 4 | 2 | 1 | | S | UL | 12 | 5 | 3 | 4 | 3 | 10 | 7 | 5 | 5 | 3 | 2 | | | F-2 | NS | UL | 11 | 5 | 3 | 4 | 3 | 5 | 5 | 5 | 5 | 3 | 2 | | S | UL | 12 | 6 | 4 | 5 | 4 | 12 | 8 | 6 | 6 | 4 | 3 | | | H-1 | NSc,d | 1 | 1 | 1 | 1 | 1 | 1 | NP | NP | NP | 1 | 1 | NP | | S | | | | | | | 1 | 1 | 1 | | | | | | H-2 | NSc,d | UL | 3 | 2 | 1 | 2 | 1 | 1 | 1 | 1 | 2 | 1 | 1 | | S | | | | | | | 2 | 2 | 2 | | | | | | H-3 | NSc,d | UL | 6 | 4 | 2 | 4 | 2 | 3 | 3 | 3 | 4 | 2 | 1 | | S | | | | | | | 4 | 4 | 4 | | | | | | H-4 | NSc,d | UL | 7 | 5 | 3 | 5 | 3 | 5 | 5 | 5 | 5 | 3 | 2 | | S | UL | 8 | 6 | 4 | 6 | 4 | 8 | 7 | 6 | 6 | 4 | 3 | | | H-5 | NSc,d | 4 | 4 | 3 | 3 | 3 | 3 | 2 | 2 | 2 | 3 | 3 | 2 | | S | | | | | | | 3 | 3 | 3 | | | | | | I-1 Condition 1 | NSd,e | UL | 9 | 4 | 3 | 4 | 3 | 4 | 4 | 4 | 4 | 3 | 2 | | S | UL | 10 | 5 | 4 | 5 | 4 | 10 | 7 | 5 | 5 | 4 | 3 | | | I-1 Condition 2 | NSd,e | UL | 9 | 4 | 3 | 4 | 3 | 3 | 3 | 3 | 4 | 3 | 2 | | Si | UL | 10 | 5 | | | | 10 | 6 | 4 | | | | | | I-2 | NSd,f | UL | 4 | 2 | 1 | 1 | NP | NP | NP | NP | 1 | 1 | NP | | S | UL | 5 | 3 | | | | 7 | 5 | 1 | | | | | | I-3 | NSd,e | UL | 4 | 2 | 1 | 2 | 1 | 2 | 2 | 2 | 2 | 2 | 1 | | S | UL | 5 | 3 | 2 | 3 | 2 | 7 | 5 | 3 | 3 | 3 | 2 | | | I-4 | NSd,g | UL | 5 | 3 | 2 | 3 | 2 | 3 | 3 | 3 | 3 | 1 | 1 | | S | UL | 6 | 4 | 3 | 4 | 3 | 9 | 6 | 4 | 4 | 2 | 2 | | | M | NS | UL | 11 | 4 | 2 | 4 | 2 | 4 | 4 | 4 | 4 | 3 | 1 | | S | UL | 12 | 5 | 3 | 5 | 3 | 12 | 8 | 6 | 5 | 4 | 2 | | | R-1h | NSd | UL | 11 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 3 | 2 | | S13R | 4 | 4 | | | | | | | | | 4 | 3 | | | S | UL | 12 | 5 | 5 | 5 | 5 | 18 | 12 | 8 | 5 | 4 | 3 | | | R-2h | NSd | UL | 11 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 3 | 2 | | S13R | 4 | 4 | 4 | | | | | | | | 4 | 3 | | | | S | UL | 12 | 5 | 5 | 5 | 5 | 18 | 12 | 8 | 5 | 4 | 3 | | R-3h | NSd | UL | 11 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 3 | 3 | | S13D | 4 | 4 | | | | | | | | | 3 | 3 | | | S13R | 4 | 4 | | | | | | | | | 4 | 4 | | | S | UL | 12 | 5 | 5 | 5 | 5 | 18 | 12 | 5 | 5 | 4 | 4 | | | R-4h | NSd | UL | 11 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 3 | 2 | | S13D | 4 | 4 | | | | | | | | | 3 | 2 | | | S13R | 4 | 4 | | | | | | | | | 4 | 3 | | | S | UL | 12 | 5 | 5 | 5 | 5 | 18 | 12 | 5 | 5 | 4 | 3 | | | S-1 | NS | UL | 11 | 4 | 2 | 3 | 2 | 4 | 4 | 4 | 4 | 3 | 1 | | S | UL | 12 | 5 | 4 | 4 | 4 | 10 | 7 | 5 | 5 | 4 | 2 | | | S-2 | NS | UL | 11 | 5 | 3 | 4 | 3 | 4 | 4 | 4 | 5 | 4 | 2 | | S | UL | 12 | 6 | 4 | 5 | 4 | 12 | 8 | 5 | 6 | 5 | 3 | | | U | NS | UL | 5 | 4 | 2 | 3 | 2 | 4 | 4 | 4 | 4 | 2 | 1 | | S | UL | 6 | 5 | 3 | 4 | 3 | 9 | 6 | 5 | 5 | 3 | 2 | |

| UL = Unlimited; NP = Not permitted; NS = Buildings not equipped throughout with an automatic sprinkler system; S = Buildings equipped throughout with an automatic sprinkler system installed in accordance with Section 903.3.1.1; S13R = Buildings equipped throughout with an automatic sprinkler system installed in accordance with Section 903.3.1.2; S13D = Buildings equipped throughout with an automatic sprinkler system installed in accordance with Section 903.3.1.3. | | | | --- | --- | --- | | | a | See Chapters 4 and 5 for specific exceptions to the allowable height in this chapter. | | | b | See Section 903.2 for the minimum thresholds for protection by an automatic sprinkler system for specific occupancies. | | | c | New Group H occupancies are required to be protected by an automatic sprinkler system in accordance with Section 903.2.5. | | | d | The NS value is only for use in evaluation of existing building height in accordance with the International Existing Building Code. | | | e | New Group I-1 and I-3 occupancies are required to be protected by an automatic sprinkler system in accordance with Section 903.2.6. For new Group I-1 occupancies Condition 1, see Exception 1 of Section 903.2.6. | | | f | New and existing Group I-2 occupancies are required to be protected by an automatic sprinkler system in accordance with Section 903.2.6 and Section 1103.5 of the International Fire Code. | | | g | For new Group I-4 occupancies, see Exceptions 2 and 3 of Section 903.2.6. | | | h | New Group R occupancies are required to be protected by an automatic sprinkler system in accordance with Section 903.2.8. | | | i | Group I-1, Condition 2 Assisted living facilities licensed in accordance with chapter 388-78A WAC and residential treatment facilities as licensed by Washington state under chapter 246-337 WAC shall be permitted to use the allowable number of stories for Group R-2 occupancies. |

504.4.1 Stair enclosure pressurization increase. For Group R-1, R-2, and I-1 Condition 2 Assisted living facilities licensed under chapter 388-78A WAC and residential treatment facilities as licensed by Washington state under chapter 246-337 WAC located in buildings of Type VA construction equipped throughout with an approved automatic sprinkler system in accordance with Section 903.3.1.1, the maximum number of stories permitted in Section 504.4 may be increased by one provided the interior exit stairways and ramps are pressurized in accordance with Sections 909.6.3 and 909.20. Legally required standby power shall be provided in accordance with Sections 909.11 and 2702.17 for buildings constructed in compliance with this section and be connected to stairway shaft pressurization equipment, elevators and lifts used for accessible means of egress (if provided), elevator hoistway pressurization equipment (if provided) and other life safety equipment as determined by the authority having jurisdiction. For the purposes of this section, legally required standby power shall comply with 2020 NEC Section 701.12, options (C), (D), (E), (F), (H) or (J) or subsequent revised section number(s).

History

• Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 23-23-102, § 51-50-0504, filed 11/15/23, effective 3/16/24
• WSR 22-13-094, 23-12-103, and 23-20-023, § 51-50-0504, filed 6/14/22, 6/7/23, and 9/25/23, effective 3/15/24
• WSR 21-06-035, § 51-50-0504, filed 2/23/21, effective 3/26/21
• WSR 20-21-021, § 51-50-0504, filed 10/9/20, effective 11/9/20
• WSR 20-01-090, § 51-50-0504, filed 12/12/19, effective 7/1/20
• WSR 19-02-038, § 51-50-0504, filed 12/26/18, effective 7/1/19
• WSR 16-03-064, § 51-50-0504, filed 1/19/16, effective 7/1/16. Statutory Authority: RCW 19.27.031 and chapters 19.27 and 34.05 RCW. WSR 13-04-067, § 51-50-0504, filed 2/1/13, effective 7/1/13. Statutory Authority: Chapter 19.27 RCW. WSR 10-24-059, § 51-50-0504, filed 11/29/10, effective 7/1/11.

Wash. Admin. Code § 51-50-0505 Section 0505—Mezzanines and equipment platforms.

505.1 General.Mezzanines shall comply with Section 505.2. Equipment platforms shall comply with Section 505.3.

| EXCEPTION: | Lofts in Group R occupancy dwelling units and sleeping units shall be permitted to comply with Section 420.14, subject to the limitations in Section 420.14.1. | | --- | --- |

History

• Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 23-23-102, § 51-50-0505, filed 11/15/23, effective 3/16/24
• WSR 22-13-094, 23-12-103, and 23-20-023, § 51-50-0505, filed 6/14/22, 6/7/23, and 9/25/23, effective 3/15/24
• WSR 20-01-090, § 51-50-0505, filed 12/12/19, effective 7/1/20
• WSR 16-03-064, § 51-50-0505, filed 1/19/16, effective 7/1/16.

Wash. Admin. Code § 51-50-0506 Reserved.

History

• Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 22-13-094, 23-12-103, and 23-20-023, § 51-50-0506, filed 6/14/22, 6/7/23, and 9/25/23, effective 3/15/24
• WSR 20-01-090, § 51-50-0506, filed 12/12/19, effective 7/1/20
• WSR 19-02-038, § 51-50-0506, filed 12/26/18, effective 7/1/19
• WSR 16-03-064, § 51-50-0506, filed 1/19/16, effective 7/1/16. Statutory Authority: RCW 19.27.031 and chapters 19.27 and 34.05 RCW. WSR 13-04-067, § 51-50-0506, filed 2/1/13, effective 7/1/13. Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 10-03-097, § 51-50-0506, filed 1/20/10, effective 7/1/10. Statutory Authority: RCW 19.27.074, 19.27.020, and chapters 70.92, 19.27, and 34.05 RCW. WSR 07-01-091, § 51-50-0506, filed 12/19/06, effective 7/1/07.

Wash. Admin. Code § 51-50-0508 Section 508—Mixed use and occupancy.

508.5.1 Limitations. The following shall apply to live/work areas:

1. The live/work unit is permitted to be not greater than 3,000 square feet (279 m) in area.

2. The nonresidential area is permitted to be not more than 50 percent of the area of each live/work unit.

3. The nonresidential area function shall be limited to the first or main floor only of the live/work unit.

History

• Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 22-13-094, 23-12-103, and 23-20-023, § 51-50-0508, filed 6/14/22, 6/7/23, and 9/25/23, effective 3/15/24
• WSR 19-02-038, § 51-50-0508, filed 12/26/18, effective 7/1/19.

Wash. Admin. Code § 51-50-0509 Section 509—Incidental uses.

Table 509.1

Incidental Uses

| Room or Area | Separation and/or Protection | | --- | --- | | Dry type transformers over 112.5 kVA and required to be in a fire resistant room per NEC (NFPA 70) Section 450.21 (B)1 | 1 hour or provide automatic sprinkler system |

| 1 | Dry type transformers rated over 35,000 volts and oil-insulated transformers shall be installed in a transformer vault complying with NFPA 70. | | --- | --- |

(Remainder of table unchanged)

History

• Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 23-23-102, § 51-50-0509, filed 11/15/23, effective 3/16/24
• WSR 22-13-094, 23-12-103, and 23-20-023, § 51-50-0509, filed 6/14/22, 6/7/23, and 9/25/23, effective 3/15/24
• WSR 19-02-038, § 51-50-0509, filed 12/26/18, effective 7/1/19. Statutory Authority: RCW 19.27.031 and chapters 19.27 and 34.05 RCW. WSR 13-04-067, § 51-50-0509, filed 2/1/13, effective 7/1/13. Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 10-03-097, § 51-50-0509, filed 1/20/10, effective 7/1/10. Statutory Authority: RCW 19.27.074, 19.27.020, and chapters 70.92, 19.27, and 34.05 RCW. WSR 07-01-091, § 51-50-0509, filed 12/19/06, effective 7/1/07.

Wash. Admin. Code § 51-50-0510 Section 510—Special provisions.

510.2 Horizontal building separation allowance. A building shall be considered as separate and distinct buildings for the purpose of determining area limitations, continuity of fire walls, limitation of number of stories and type of construction where the following conditions are met:

1. The buildings are separated with a horizontal assembly having a fire-resistance rating of not less than three hours. Where vertical offsets are provided as part of a horizontal assembly, the vertical offset and the structure supporting the vertical offset shall have a fire-resistance rating of not less than three hours.

2. The building below, including the horizontal assembly, is of Type IA construction.

3. Shaft, stairway, ramp and escalator enclosures through the horizontal assembly shall have not less than a two-hour fire-resistance rating with opening protective in accordance with Section 716.

| EXCEPTION: | Where the enclosure walls below the horizontal assembly have not less than a three-hour fire-resistance rating with opening protectives in accordance with Section 716, the enclosure walls extending above the horizontal assembly shall be permitted to have a 1-hour fire-resistance rating provided that the following conditions are met: | | --- | --- | | | 1. The building above the horizontal assembly is not required to be of Type I construction. | | | 2. The enclosure connects fewer than four stories; and | | | 3. The enclosure opening protective above the horizontal assembly have a fire protection rating of not less than 1 hour. |

4. Interior exit stairways located within the Type IA building are permitted to be of combustible materials where both of the following requirements are met:

4.1. The building above the Type IA building is of Type III, IV, or V construction.

4.2. The stairway located in the Type IA building is enclosed by 3-hour fire-resistance-rated construction with opening protectives in accordance with Section 716.

5. The building or buildings above the horizontal assembly shall be permitted to have Group A, B, M, R, or S occupancies.

6. The building below the horizontal assembly shall be protected throughout by an approved automatic sprinkler system in accordance with Section 903.3.1.1, and shall be permitted to be any occupancy allowed by this code except Group H.

7. The maximum building height in feet (mm) shall not exceed the limits set forth in Section 504.3 for the building having the smaller allowable height as measured from the grade plane.

History

• Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 22-13-094, 23-12-103, and 23-20-023, § 51-50-0510, filed 6/14/22, 6/7/23, and 9/25/23, effective 3/15/24
• WSR 20-21-021, § 51-50-0510, filed 10/9/20, effective 11/9/20
• WSR 20-01-090, § 51-50-0510, filed 12/12/19, effective 7/1/20
• WSR 16-03-064, § 51-50-0510, filed 1/19/16, effective 7/1/16.

Wash. Admin. Code § 51-50-0601 Reserved.

History

• Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 22-13-094, 23-12-103, and 23-20-023, § 51-50-0601, filed 6/14/22, 6/7/23, and 9/25/23, effective 3/15/24
• WSR 19-02-038, § 51-50-0601, filed 12/26/18, effective 7/1/19.

Wash. Admin. Code § 51-50-0602 Section 602—Construction classification.

602.4.2.2.2 Protected area. Interior faces of mass timber elements, including the inside face of exterior mass timber walls and mass timber roofs, shall be protected in accordance with Section 602.4.2.2.1.

| EXCEPTIONS: | Unprotected portions of mass timber ceilings and walls complying with Section 602.4.2.2.4 and the following: | | --- | --- | | | 1. Unprotected portions of mass timber ceilings and walls complying with one of the following: 1.1. Unprotected portions of mass timber ceilings, including attached beams, shall be permitted and shall be limited to an area less than or equal to 100 percent of the floor area in any dwelling unit or fire area. | | | 1.2. Unprotected portions of mass timber walls, including attached columns, shall be permitted and shall be limited to an area less than or equal to 40 percent of the floor area in any dwelling unit or fire area. | | | 1.3. Unprotected portions of both walls and ceilings of mass timber, including attached columns and beams, in any dwelling unit or fire area shall be permitted in accordance with Section 602.4.2.2.3. | | | 2. Mass timber columns and beams that are not an integral portion of walls or ceilings, respectively, shall be permitted to be unprotected without restriction of either aggregate area or separation from one another. |

602.4.2.2.4 Separation distance between unprotected mass timber elements. In each dwelling unit or fire area, unprotected portions of mass timber walls and ceilings shall be not less than 15 feet from unprotected portions of other walls measured horizontally along the floor.

602.4.2.3 Floors. The floor assembly shall contain a noncombustible material not less than 1 inch in thickness above the mass timber. Floor finishes in accordance with Section 804 shall be permitted on top of the noncombustible material. Except where unprotected mass timber ceilings are permitted in Section 602.4.2.2.2, the underside of floor assemblies shall be protected in accordance with Section 602.4.1.2.

602.4.4.3 Concealed spaces. Concealed spaces shall not contain combustible materials other than building elements and electrical, mechanical, fire protection, or plumbing materials and equipment permitted in plenums in accordance with Section 602 of the International Mechanical Code. Concealed spaces shall comply with applicable provisions of Section 718. Concealed spaces shall be protected in accordance with one or more of the following:

1. The building shall be sprinklered throughout in accordance with Section 903.3.1.1 and automatic sprinklers shall also be provided in the concealed space.

2. The concealed space shall be completely filled with noncombustible insulation.

3. Combustible surfaces within the concealed space shall be fully sheathed with not less than 5/8-inch Type X gypsum board.

| EXCEPTION: | Concealed spaces within interior walls and partitions with a 1-hour or greater fire-resistance rating complying with Section 2304.11.2.2 shall not require additional protection. | | --- | --- |

History

• Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 22-13-094, 23-12-103, and 23-20-023, § 51-50-0602, filed 6/14/22, 6/7/23, and 9/25/23, effective 3/15/24
• WSR 20-21-021, § 51-50-0602, filed 10/9/20, effective 11/9/20
• WSR 20-01-090, § 51-50-0602, filed 12/12/19, effective 7/1/20
• WSR 19-02-038, § 51-50-0602, filed 12/26/18, effective 7/1/19.

Wash. Admin. Code § 51-50-0603 Reserved.

History

• Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 22-13-094, 23-12-103, and 23-20-023, § 51-50-0603, filed 6/14/22, 6/7/23, and 9/25/23, effective 3/15/24
• WSR 20-21-021, § 51-50-0603, filed 10/9/20, effective 11/9/20
• WSR 20-01-090, § 51-50-0603, filed 12/12/19, effective 7/1/20
• WSR 19-02-038, § 51-50-0603, filed 12/26/18, effective 7/1/19.

Wash. Admin. Code § 51-50-0703 Reserved.

History

• Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 22-13-094, 23-12-103, and 23-20-023, § 51-50-0703, filed 6/14/22, 6/7/23, and 9/25/23, effective 3/15/24
• WSR 19-02-038, § 51-50-0703, filed 12/26/18, effective 7/1/19.

Wash. Admin. Code § 51-50-0704 Section 704—Fire-resistance rating of structural members.

704.6.1 Secondary (nonstructural) attachments to structural members. Where primary and secondary structural steel members require fire protection, any additional structural steel members having direct connection to the primary structural frame or secondary structural members shall be protected with the same fire-resistive material and thickness as required for the structural member. The protection shall extend away from the structural member a distance of not less than 12 inches (305 mm), or shall be applied to the entire length where the attachment is less than 12 inches (305 mm) long. Where an attachment is hollow and the ends are open, the fire-resistive material and thickness shall be applied to both exterior and interior of the hollow steel attachment.

History

• Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 22-13-094, 23-12-103, and 23-20-023, § 51-50-0704, filed 6/14/22, 6/7/23, and 9/25/23, effective 3/15/24
• WSR 20-01-090, § 51-50-0704, filed 12/12/19, effective 7/1/20.

Wash. Admin. Code § 51-50-0705 Section 705—Exterior walls.

705.2 Projections.Cornices, roof and eave overhangs, projecting floors above, exterior balconies and similar projections extending beyond the exterior wall shall conform to the requirements of this section and Section 1405. Exterior egress balconies and exterior exit stairways and ramps shall comply with Sections 1021 and 1027, respectively. Projections shall not extend any closer to the line used to determine the fire separation distance than shown in Table 705.2.

| EXCEPTIONS: | 1. Buildings on the same lot and considered as portions of one building in accordance with Section 705.3 are not required to comply with this section for projections between the buildings. | | --- | --- | | | 2. Projecting floors complying with Section 705.2.4 are not required to comply with the projection limitations of Table 705.2. |

705.2.5 Projecting floors. Where the fire separation distance on a lower floor is greater than the fire separation distance on the floor immediately above, the projecting floor shall have not less than the fire-resistance rating as the exterior wall above based on Table 602. The fire-resistant rating of the horizontal portion shall be continuous to the lower vertical wall.

Table 705.5

Fire-Resistance Rating Requirements for Exterior Walls Based on Fire Separation Distancea,d,g,j

| Fire Separation Distance = X (feet) | Type of Construction | Occupancy Group He | Occupancy Group F-1, M, S-1f | Occupancy Group A, B, E, F-2, I, Ri, S-2, Uh | | --- | --- | --- | --- | --- | | X < 5b | All | 3 | 2 | 1 | | 5 ≤ X < 10 | IA, IVA | 3 | 2 | 1 | | | Others | 2 | 1 | 1 | | 10 ≤ X < 30 | IA, IB, IVA, IVB | 2 | 1 | 1c | | | IIB, VB | 1 | 0 | 0 | | | Others | 1 | 1 | 1c | | X ≥ 30 | All | 0 | 0 | 0 |

| For SI: 1 foot = 304.8 mm. | | | | --- | --- | --- | | | a | Load-bearing exterior walls shall also comply with the fire-resistance rating requirements of Table 601. | | | b | See Section 706.1.1 for party walls. | | | c | Open parking garages complying with Section 406 shall not be required to have a fire-resistance rating. | | | d | The fire-resistance rating of an exterior wall is determined based upon the fire separation distance of the exterior wall and the story in which the wall is located. | | | e | For special requirements for Group H occupancies, see Section 415.6. | | | f | For special requirements for Group S aircraft hangars, see Section 412.3.1. | | | g | Where Table 705.8 permits nonbearing exterior walls with unlimited area of unprotected openings, the required fire-resistance rating for the exterior walls is 0 hours. | | | h | For a building containing only a Group U occupancy private garage or carport, the exterior wall shall not be required to have a fire-resistance rating where the fire separation distance is 5 feet (1523 mm) or greater. | | | i | For a Group R-3 building of Type II-B or Type V-B construction, the exterior wall shall not be required to have a fire-resistance rating where the fire separation distance is 5 feet (1523 mm) or greater. | | | j | In a mixed occupancy building containing Group R-3 and Group U private garage, the exterior wall fire-resistance rating shall be as required for Group R-3. |

Table 705.8

Maximum Area of Exterior Wall Openings Based on Fire Separation Distance and Degree of Opening Protectionl

| Fire Separation Distance (feet) | Degree of Opening Protection | Allowable Areaa | | --- | --- | --- | | | Unprotected, Nonsprinklered (UP, NS) | Not Permittedk | | 0 to less than 3b,c,k | Unprotected, Sprinklered (UP, S)i | Not Permittedk | | | Protected (P) | Not Permittedk | | | Unprotected, Nonsprinklered (UP, NS) | Not Permitted | | 3 to less than 5d,e | Unprotected, Sprinklered (UP, S)i | 15% | | | Protected (P) | 15% | | | Unprotected, Nonsprinklered (UP, NS) | 10%h | | 5 to less than 10e,f,j | Unprotected, Sprinklered (UP, S)i | 25% | | | Protected (P) | 25% | | | Unprotected, Nonsprinklered (UP, NS) | 15%h | | 10 to less than 15e,f,g,j | Unprotected, Sprinklered (UP, S)i | 45% | | | Protected (P) | 45% | | | Unprotected, Nonsprinklered (UP, NS) | 25% | | 15 to less than 20f,g,j | Unprotected, Sprinklered (UP, S)i | 75% | | | Protected (P) | 75% | | | Unprotected, Nonsprinklered (UP, NS) | 45% | | 20 to less than 25f,g,j | Unprotected, Sprinklered (UP, S)i | No Limit | | | Protected (P) | No Limit | | | Unprotected, Nonsprinklered (UP, NS) | 70% | | 25 to less than 30f,g,j | Unprotected, Sprinklered (UP, S)i | No Limit | | | Protected (P) | No Limit | | | Unprotected, Nonsprinklered (UP, NS) | No Limit | | 30 or greater | Unprotected, Sprinklered (UP, S)i | No Limit | | | Protected (P) | No Limit |

| For SI: 1 foot = 304.8 mm. | | | | --- | --- | --- | | | UP, NS = Unprotected openings in buildings not equipped throughout with an automatic sprinkler system in accordance with Section 903.3.1.1. | | | | UP, S = Unprotected openings in buildings equipped throughout with an automatic sprinkler system in accordance with Section 903.3.1.1. | | | | P = Openings protected with an opening protective assembly in accordance with Section 705.8.2. | | | | a | Values indicated are the percentage of the area of the exterior wall, per story. | | | b | For the requirements for fire walls of buildings with differing heights, see Section 706.6.1. | | | c | For openings in a fire wall for buildings on the same lot, see Section 706.8. | | | d | The maximum percentage of unprotected and protected openings shall be 25 percent for Group R-3 occupancies. | | | e | Unprotected openings shall not be permitted for openings with a fire separation distance of less than 15 feet for Group H-2 and H-3 occupancies. | | | f | The area of unprotected and protected openings shall not be limited for Group R-3 occupancies, with a fire separation distance of 5 feet or greater. | | | g | The area of openings in an open parking structure with a fire separation distance of 10 feet or greater shall not be limited. | | | h | Includes buildings accessory to Group R-3. | | | i | Not applicable to Group H-1, H-2, and H-3 occupancies. | | | j | The area of openings in a building containing only a Group U occupancy private garage or carport with a fire separation distance of 5 feet or greater shall not be limited. | | | k | For openings between S-2 parking garage and Group R-2 building, see Section 705.3, Exception 2. | | | l | In a mixed occupancy building containing Group R-3 and Group U private garage, the maximum area of exterior openings shall be as required for Group R-3. |

History

• Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 23-23-102, § 51-50-0705, filed 11/15/23, effective 3/16/24
• WSR 22-13-094, 23-12-103, and 23-20-023, § 51-50-0705, filed 6/14/22, 6/7/23, and 9/25/23, effective 3/15/24
• WSR 20-21-021, § 51-50-0705, filed 10/9/20, effective 11/9/20
• WSR 20-01-090, § 51-50-0705, filed 12/12/19, effective 7/1/20.

Wash. Admin. Code § 51-50-0706 Section 706—Fire walls.

706.3 Materials.Fire walls that separate a building of Type I or II construction from a building of any construction type shall be of any approved noncombustible materials. Other fire walls shall be built of materials consistent with the types permitted for the type of construction of the building.

706.4 Fire-resistance rating.Fire walls shall have a fire-resistance rating of not less than that required by Table 706.4.

Table 706.4

Fire Wall Fire-resistance Ratings

| GROUP | FIRE-RESISTANCE RATING (hours) | | --- | --- | | A, B, E, H-4, I, R-1, R-2, U | 3a | | F-1, H-3b, H-5, M, S-1 | 3 | | H-1, H-2 | 4b | | F-2, S-2, R-3, R-4 | 2 |

| a | In Type II, III, IV, or V construction, walls shall be permitted to have a 2-hour fire-resistance rating. | | --- | --- | | b | For Group H-1, H-2, or H-3 buildings, also see Sections 415.7 and 415.8. |

History

• Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 23-22-115, § 51-50-0706, filed 10/31/23, effective 3/15/24
• WSR 22-13-094, 23-12-103, and 23-20-023, § 51-50-0706, filed 6/14/22, 6/7/23, and 9/25/23, effective 3/15/24
• WSR 20-01-090, § 51-50-0706, filed 12/12/19, effective 7/1/20
• WSR 16-03-064, § 51-50-0706, filed 1/19/16, effective 7/1/16.

Wash. Admin. Code § 51-50-07070 Reserved.

History

• Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 22-13-094, 23-12-103, and 23-20-023, § 51-50-07070, filed 6/14/22, 6/7/23, and 9/25/23, effective 3/15/24
• WSR 20-01-090, § 51-50-07070, filed 12/12/19, effective 7/1/20.

Wash. Admin. Code § 51-50-0708 Section 708—Reserved.

History

• Statutory Authority: RCW 19.27.031 and chapters 19.27 and 34.05 RCW. WSR 13-04-067, § 51-50-0708, filed 2/1/13, effective 7/1/13. Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 10-03-097, amended and recodified as § 51-50-0708, filed 1/20/10, effective 7/1/10. Statutory Authority: RCW 19.27.074, 19.27.020, and chapters 70.92, 19.27, and 34.05 RCW. WSR 07-01-091, § 51-50-0707, filed 12/19/06, effective 7/1/07. Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 04-01-108, § 51-50-0707, filed 12/17/03, effective 7/1/04.

Wash. Admin. Code § 51-50-0710 Section 710—Reserved.

History

• Statutory Authority: RCW 19.27.031 and chapters 19.27 and 34.05 RCW. WSR 13-04-067, § 51-50-0710, filed 2/1/13, effective 7/1/13. Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 10-03-097, § 51-50-0710, filed 1/20/10, effective 7/1/10.

Wash. Admin. Code § 51-50-0713 Section 713—Shaft enclosures.

713.13.7 Chute venting and roof termination. The full diameter of waste and linen chutes shall extend a minimum of 3 feet (0.92 m) above the building roof and be gravity vented in accordance with International Mechanical Code Section 515.

| EXCEPTIONS: | 1. Where mechanically ventilated in accordance with International Mechanical Code Section 515 the full diameter of the chute shall extend through the roof a minimum of 3 feet (0.92 m) and terminate at a blast cap. The mechanical exhaust connection shall tap into the side of the blast cap extension above the roof. | | --- | --- | | | 2. Where the trash chute does not extend to the upper floor of the building below the roof the trash chute shall be permitted to gravity vent to a sidewall louver termination. The horizontal extension of the trash chute shall be the full diameter of the chute and shall be enclosed in rated construction equal to the rating of the shaft enclosure. Where the chute is mechanically ventilated in accordance with International Mechanical Code Section 515 the blast cap shall terminate behind the louver and the exhaust fan and duct connection will be enclosed in the rated shaft. |

History

• Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 22-13-094, 23-12-103, and 23-20-023, § 51-50-0713, filed 6/14/22, 6/7/23, and 9/25/23, effective 3/15/24
• WSR 20-01-090, § 51-50-0713, filed 12/12/19, effective 7/1/20.

Wash. Admin. Code § 51-50-0716 Section 716—Opening protectives.

716.2.6.1 Door closing.Fire doors shall be latching and self- or automatic-closing in accordance with this section.

| EXCEPTIONS: | 1. Fire doors located in common walls separating sleeping units in Group R-l shall be permitted without automatic- or self-closing devices. | | --- | --- | | | 2. The elevator car doors and the associated hoistway enclosure doors at the floor level designated for recall in accordance with Section 3003.2 shall be permitted to remain open during Phase I emergency recall operation. | | | 3. In Group I-1, Condition 2 Assisted living facilities licensed under chapter 388-78A WAC and residential treatment facilities licensed under chapter 246-337 WAC, fire doors in dwelling and sleeping units opening to the corridor shall be permitted without automatic or self-closing devices when all of the following conditions exist: | | | 3.1 Each floor is constantly attended by staff on a 24-hour basis and stationed on that floor; | | | 3.2 The facility is provided with an NFPA 13 sprinkler system throughout; | | | 3.3 Doors shall be equipped with positive latching; | | | 3.4 Dwelling and sleeping units are not equipped with cooking appliances; | | | 3.5 Dwelling and sleeping units shall be equipped with a smoke detection system interconnected with the smoke detection system required by Section 907.2.6.1. |

History

• Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 21-06-035, § 51-50-0716, filed 2/23/21, effective 3/26/21
• WSR 16-03-064, § 51-50-0716, filed 1/19/16, effective 7/1/16.

Wash. Admin. Code § 51-50-0717 Reserved.

History

• Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 22-13-094, 23-12-103, and 23-20-023, § 51-50-0717, filed 6/14/22, 6/7/23, and 9/25/23, effective 3/15/24
• WSR 20-01-090, § 51-50-0717, filed 12/12/19, effective 7/1/20.

Wash. Admin. Code § 51-50-0718 Reserved.

History

• Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 22-13-094, 23-12-103, and 23-20-023, § 51-50-0718, filed 6/14/22, 6/7/23, and 9/25/23, effective 3/15/24
• WSR 19-02-038, § 51-50-0718, filed 12/26/18, effective 7/1/19.

Wash. Admin. Code § 51-50-0722 Reserved.

History

• Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 23-23-102, § 51-50-0722, filed 11/15/23, effective 3/16/24
• WSR 22-13-094, 23-12-103, and 23-20-023, § 51-50-0722, filed 6/14/22, 6/7/23, and 9/25/23, effective 3/15/24
• WSR 19-02-038, § 51-50-0722, filed 12/26/18, effective 7/1/19.

Wash. Admin. Code § 51-50-0803 Reserved.

History

• Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 22-13-094, 23-12-103, and 23-20-023, § 51-50-0803, filed 6/14/22, 6/7/23, and 9/25/23, effective 3/15/24
• WSR 19-02-038, § 51-50-0803, filed 12/26/18, effective 7/1/19.

Wash. Admin. Code § 51-50-0902 Reserved.

History

• Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 22-13-094, 23-12-103, and 23-20-023, § 51-50-0902, filed 6/14/22, 6/7/23, and 9/25/23, effective 3/15/24. Statutory Authority: RCW 19.27.031 and chapters 19.27 and 34.05 RCW. WSR 13-04-067, § 51-50-0902, filed 2/1/13, effective 7/1/13. Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 04-01-108, § 51-50-0902, filed 12/17/03, effective 7/1/04.

Wash. Admin. Code § 51-50-0903 Section 903—Automatic sprinkler systems.

903.2.1.3 Group A-3. An automatic sprinkler system shall be provided throughout stories containing Group A-3 occupancies and throughout all stories from the Group A-3 occupancy to and including the levels of exit discharge serving that occupancy where one of the following conditions exists:

1. The fire area exceeds 12,000 square feet (1115 m2).

2. The fire area has an occupant load of 300 or more.

3. The fire area is located on a floor other than a level of exit discharge serving such occupancies.

| EXCEPTION: | For fixed guideway transit and passenger rail system stations, an automatic sprinkler system shall be provided in accordance with Section 3116. | | --- | --- |

903.2.1.6 Assembly occupancies on roofs. Where an occupied roof has an assembly occupancy with an occupant load exceeding 100 for Group A-2, and 300 for other Group A occupancies, the building shall be equipped with an automatic sprinkler system in accordance with Section 903.3.1.1 or 903.3.1.2.

| EXCEPTION: | Open parking garages of Type I or Type II construction. | | --- | --- |

903.2.1.8 Nightclub. An automatic sprinkler system shall be provided throughout Group A-2 nightclubs as defined in this code.

903.2.3 Group E. An automatic sprinkler system shall be provided for fire areas containing Group E occupancies where the fire area has an occupant load of 51 or more, calculated in accordance with Table 1004.5.

| EXCEPTIONS: | 1. Portable school classrooms with an occupant load of 50 or less calculated in accordance with Table 1004.5, provided that the aggregate area of any cluster of portable school classrooms does not exceed 6,000 square feet (557 m2); and clusters of portable school classrooms shall be separated as required by the building code; or | | --- | --- | | | 2. Portable school classrooms with an occupant load from 51 through 98, calculated in accordance with Table 1004.5, and provided with two means of direct independent exterior egress from each classroom in accordance with Chapter 10, and one exit from each class room shall be accessible, provided that the aggregate area of any cluster of portable classrooms does not exceed 6,000 square feet (557 m2); and clusters of portable school classrooms shall be separated as required by the building code; or | | | 3. Fire areas containing day care and preschool facilities with a total occupant load of 100 or less located at the level of exit discharge where every room in which care is provided has not fewer than one exit discharge door. |

903.2.6 Group I. An automatic sprinkler system shall be provided throughout buildings with a Group I fire area.

| EXCEPTIONS: | 1. An automatic sprinkler system installed in accordance with Section 903.3.1.2 shall be permitted in Group I-1 Condition 1 facilities. | | --- | --- | | | 2. Where new construction house 16 persons receiving care, an automatic sprinkler system installed in accordance with Section 903.3.1.2 shall be permitted for Group I-1, Condition 2, assisted living facilities licensed under chapter 388-78A WAC and residential treatment facilities licensed under chapter 246-337 WAC. | | | 3. An automatic sprinkler system installed in accordance with Section 903.3.1.2 shall be permitted in additions to existing buildings where both of the following situations are true: | | | 3.1. The addition is made to a building previously approved as Group LC or Group R-2 that houses either an assisted living facility licensed under chapter 388-78A WAC or residential treatment facility licensed under chapter 246-337 WAC. | | | 3.2. The addition contains spaces for 16 or fewer persons receiving care. |

903.2.6.1 Group I-4. An automatic sprinkler system shall be provided in fire areas containing Group I-4 occupancies where the fire area has an occupant load of 51 or more, calculated in accordance with Table 1004.5.

| EXCEPTIONS: | 1. An automatic sprinkler system is not required for Group I-4 day care facilities with a total occupant load of 100 or less, and located at the level of exit discharge and where every room where care is provided has not fewer than one exterior exit door. | | --- | --- | | | 2. In buildings where Group I-4 day care is provided on levels other than the level of exit discharge, an automatic sprinkler system in accordance with Section 903.3.1.1 shall be installed on the entire floor where care is provided, all floors between the level of care and the level of exit discharge and all floors below the level of exit discharge other than areas classified as an open parking garage. |

903.2.8 Group R. An automatic fire sprinkler system installed in accordance with Section 903.3 shall be provided throughout all buildings with a Group R fire area.

| EXCEPTION: | Group R-1 if all of the following conditions apply: | | --- | --- | | | 1. The Group R fire area is no more than 500 square feet and is used for recreational use only. | | | 2. The Group R fire area is only one story. | | | 3. The Group R fire area does not include a basement. | | | 4. The Group R fire area is no closer than 30 feet from another structure. | | | 5. Cooking is not allowed within the Group R fire area. | | | 6. The Group R fire area has an occupant load of no more than 8. | | | 7. A hand held (portable) fire extinguisher is in every Group R fire area. |

903.2.11 Specific building areas and hazards. In all occupancies other than Group U, an automatic sprinkler system shall be installed for building design or hazards in the locations set forth in Sections 903.2.11.1 through 903.2.11.7.

903.2.11.1.3 Basements. Where any portion of a basement is located more than 75 feet (22,860 mm) from openings required by Section 903.2.11.1, or where new walls, partitions or other similar obstructions are installed that increase the exit access travel distance to more than 75 feet, the basement shall be equipped throughout with an approved automatic sprinkler system.

903.2.11.7 Relocatable buildings within buildings. Relocatable buildings or structures located within a building with an approved fire sprinkler system shall be provided with fire sprinkler protection within the occupiable space of the building and the space underneath the relocatable building.

| EXCEPTIONS: | 1. Sprinkler protection is not required underneath the building when the space is separated from the adjacent space by construction resisting the passage of smoke and heat and combustible storage will not be located there. | | --- | --- | | | 2. If the building or structure does not have a roof or ceiling obstructing the overhead sprinklers. | | | 3. Construction trailers and temporary offices used during new building construction prior to occupancy. | | | 4. Movable shopping mall kiosks with a roof or canopy dimension of less than 4 feet on the smallest side. |

903.3.1.2 NFPA 13R sprinkler systems.Automatic sprinkler systems in Group R occupancies up to and including four stories in height in buildings not exceeding 60 feet (18,288 mm) in height above grade plane shall be permitted to be installed throughout in accordance with NFPA 13R.

The number of stories of Group R occupancies constructed in accordance with Sections 510.2 and 510.4 shall be measured from the horizontal assembly creating separate buildings.

903.3.5.3 Underground portions of fire protection system water supply piping. The installation or modification of an underground water main, public or private, supplying a water-based fire protection system shall be in accordance with NFPA 24 and chapter 18.160 RCW. Piping and appurtenances downstream of the first control valve on the lateral or service line from the distribution main to one-foot above finished floor shall be approved by the fire code official. Such underground piping shall be installed by a fire sprinkler system contractor licensed in accordance with chapter 18.160 RCW and holding either a Level U or a Level 3 license. For underground piping supplying systems installed in accordance with Section 903.3.1.2, a Level 2, 3, or U licensed contractor is acceptable.

History

• Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 23-23-102, § 51-50-0903, filed 11/15/23, effective 3/16/24
• WSR 22-13-094, 23-12-103, and 23-20-023, § 51-50-0903, filed 6/14/22, 6/7/23, and 9/25/23, effective 3/15/24
• WSR 20-21-021, § 51-50-0903, filed 10/9/20, effective 11/9/20
• WSR 20-01-090, § 51-50-0903, filed 12/12/19, effective 7/1/20
• WSR 16-03-064, § 51-50-0903, filed 1/19/16, effective 7/1/16. Statutory Authority: RCW 19.27.074, 19.27.020, and 19.27.031. WSR 14-24-089, § 51-50-0903, filed 12/1/14, effective 5/1/15. Statutory Authority: RCW 19.27.031 and chapters 19.27 and 34.05 RCW. WSR 13-04-067, § 51-50-0903, filed 2/1/13, effective 7/1/13. Statutory Authority: Chapter 19.27 RCW. WSR 10-24-059, § 51-50-0903, filed 11/29/10, effective 7/1/11. Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 10-03-097, § 51-50-0903, filed 1/20/10, effective 7/1/10. Statutory Authority: RCW 19.27.190, 19.27.020, and chapters 19.27 and 34.05 RCW. WSR 08-01-110, § 51-50-0903, filed 12/18/07, effective 4/1/08. Statutory Authority: RCW 19.27.074, 19.27.020, and chapters 70.92, 19.27, and 34.05 RCW. WSR 07-01-091, § 51-50-0903, filed 12/19/06, effective 7/1/07. Statutory Authority: RCW 19.27.020, 19.27.031, 19.27.074, and chapters 19.27 and 34.05 RCW. WSR 05-24-070, § 51-50-0903, filed 12/5/05, effective 7/1/06. Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 04-01-108, § 51-50-0903, filed 12/17/03, effective 7/1/04.

Wash. Admin. Code § 51-50-0907 Section 907—Fire alarm and detection systems.

[F] 907.2.3 Group E. Group E occupancies shall be provided with a manual fire alarm system that initiates the occupant notification signal utilizing one of the following:

1. An emergency voice/alarm communication system meeting the requirements of Section 907.5.2.2 and installed in accordance with Section 907.6; or

2. A system developed as part of a safe school plan adopted in accordance with RCW 28A.320.125 or developed as part of an emergency response system consistent with the provisions of RCW 28A.320.126. The system must achieve all of the following performance standards:

2.1 The ability to broadcast voice messages or customized announcements;

2.2 Includes a feature for multiple sounds, including sounds to initiate a lock down;

2.3 The ability to deliver messages to the interior of a building, areas outside of a building as designated pursuant to the safe school plan, and to personnel;

2.4 The ability for two-way communications;

2.5 The ability for individual room calling;

2.6 The ability for a manual override;

2.7 Installation in accordance with NFPA 72;

2.8 Provide 15 minutes of battery backup for alarm and 24 hours of battery backup for standby; and

2.9 Includes a program for annual inspection and maintenance in accordance with NFPA 72.

| EXCEPTIONS: | 1. A manual fire alarm system shall not be required in Group E occupancies with an occupant load of 50 or less. | | --- | --- | | | 2. Emergency voice/alarm communication systems meeting the requirements of Section 907.5.2.2 and installed in accordance with Section 907.6 shall not be required in Group E occupancies with occupant loads of 100 or less, such as individual portable school classroom buildings; provided that activation of the manual fire alarm system initiates an approved occupant notification signal in accordance with Section 907.5. | | | 3. Where an existing approved alarm system is in place, an emergency voice/alarm system is not required in any portion of an existing Group E building undergoing any one of the following repairs, alteration or addition: | | | 3.1 Alteration or repair to an existing building including, without limitation, alterations to rooms and systems, and/or corridor configurations, not exceeding 35 percent of the fire area of the building (or the fire area undergoing the alteration or repair if the building is comprised of two or more fire areas); or | | | 3.2 An addition to an existing building, not exceeding 35 percent of the fire area of the building (or the fire area to which the addition is made if the building is comprised of two or more fire areas). | | | 4. Manual fire alarm boxes shall not be required in Group E occupancies where all of the following apply: | | | 4.1 Interior corridors are protected by smoke detectors. | | | 4.2 Auditoriums, cafeterias, gymnasiums and similar areas are protected by heat detectors or other approved detection devices. | | | 4.3 Shops and laboratories involving dust or vapors are protected by heat detectors or other approved detection devices. | | | 4.4 Manual activation is provided from a normally occupied location. | | | 5. Manual fire alarm boxes shall not be required in Group E occupancies where all of the following apply: | | | 5.1 The building is equipped throughout with an approved automatic sprinkler system installed in accordance with Section 903.3.1.1. | | | 5.2 The emergency voice/alarm communication system will activate on sprinkler waterflow. | | | 5.3 Manual activation is provided from a normally occupied location. |

[F] 907.2.3.1 Sprinkler systems or detection. When automatic sprinkler systems or smoke detectors are installed, such systems or detectors shall be connected to the building fire alarm system.

[F] 907.2.6.4 Group I-4 occupancies. A manual fire alarm system that initiates the occupant notification signal utilizing an emergency voice/alarm communication system meeting the requirements of Section 907.5.2.2 and installed in accordance with Section 907.6 shall be installed in Group I-4 occupancies. When automatic sprinkler systems or smoke detectors are installed, such systems or detectors shall be connected to the building fire alarm system.

| EXCEPTIONS: | 1. A manual fire alarm system is not required in Group I-4 occupancies with an occupant load of 50 or less. | | --- | --- | | | 2. Emergency voice alarm communication systems meeting the requirements of Section 907.5.2.2 and installed in accordance with Section 907.6 shall not be required in Group I-4 occupancies with occupant loads of 100 or less, provided that activation of the manual fire alarm system initiates an approved occupant notification signal in accordance with Section 907.5. |

907.2.11.1 Group R-1. Single- or multiple-station smoke alarms shall be installed in all of the following locations in Group R-1:

1. In sleeping areas.

2. In each loft constructed in accordance with Section 420.14.

3. In every room in the path of the means of egress from the sleeping area to the door leading from the sleeping unit.

4. In each story within the sleeping unit, including basements. For sleeping units with split levels and without an intervening door between the adjacent levels, a smoke alarm installed on the upper level shall suffice for the adjacent lower level provided that the lower level is less than one full story below the upper level.

907.2.11.2 Groups R-2, R-3, R-4, and I-1. Single- or multiple-station smoke alarms shall be installed and maintained in Groups R-2, R-3, R-4, and I-1 regardless of occupant load at all of the following locations:

1. On the ceiling or wall outside of each separate sleeping area in the immediate vicinity of bedrooms.

2. In each room used for sleeping purposes.

3. In each loft constructed in accordance with Section 420.14.

4. In each story within a dwelling unit, including basements but not including crawl spaces and uninhabitable attics. In dwellings or dwelling units with split levels and without an intervening door between the adjacent levels, a smoke alarm installed on the upper level shall suffice for the adjacent lower level provided that the lower level is less than one full story below the upper level.

[F] 907.5.2.1.2 Maximum sound pressure. The total sound pressure level produced by combining the ambient sound pressure level with all audible notification appliances operating shall not exceed 110 dBA at the minimum hearing distance from the audible appliance. For systems operating in public mode, the maximum sound pressure level shall not exceed 30 dBA over the average ambient sound level. Where the average ambient noise is greater than 95 dBA, visible alarm notification appliances shall be provided in accordance with NFPA 72 and audible alarm notification appliances shall not be required.

907.9 Reserved.

[F] 907.10 NICET: National Institute for Certification in Engineering Technologies.

907.10.1 Scope. This section shall apply to new and existing fire alarm systems.

907.10.2 Design review. All construction documents shall be reviewed by a NICET III in fire alarms or a licensed professional engineer (PE) in Washington prior to being submitted for permitting. The reviewing professional shall submit a stamped, signed, and dated letter; or a verification method approved by the local authority having jurisdiction indicating the system has been reviewed and meets or exceeds the design requirements of the state of Washington and the local jurisdiction. (Effective July 1, 2018.)

907.10.3 Testing/maintenance. All inspection, testing, maintenance and programing not defined as "electrical construction trade" by chapter 19.28 RCW shall be completed by a NICET II in fire alarms. (Effective July 1, 2018.)

Reviser's note: The brackets and enclosed material in the text of the above section occurred in the copy filed by the agency.

Wash. Admin. Code § 51-50-0908 Reserved.

History

• Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 22-13-094, 23-12-103, and 23-20-023, § 51-50-0908, filed 6/14/22, 6/7/23, and 9/25/23, effective 3/15/24
• WSR 16-03-064, § 51-50-0908, filed 1/19/16, effective 7/1/16. Statutory Authority: Chapters 19.27A, 19.27, and 34.05 RCW. WSR 13-23-087, § 51-50-0908, filed 11/19/13, effective 4/1/14. Statutory Authority: RCW 19.27.031 and chapters 19.27 and 34.05 RCW. WSR 13-04-067, § 51-50-0908, filed 2/1/13, effective 7/1/13. Statutory Authority: RCW 19.27.074 and 19.27.530. WSR 12-01-099, § 51-50-0908, filed 12/20/11, effective 4/1/12.

Wash. Admin. Code § 51-50-0909 Section 909—Smoke control systems.

909.21.12 Hoistway venting. Hoistway venting need not be provided for pressurized elevator shafts.

909.21.13 Machine rooms. Elevator machine rooms shall be pressurized in accordance with this section unless separated from the hoistway shaft by construction in accordance with Section 707.

History

• Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 20-21-021, § 51-50-0909, filed 10/9/20, effective 11/9/20
• WSR 20-01-090, § 51-50-0909, filed 12/12/19, effective 7/1/20
• WSR 16-03-064, § 51-50-0909, filed 1/19/16, effective 7/1/16. Statutory Authority: RCW 19.27.031 and chapters 19.27 and 34.05 RCW. WSR 13-04-067, § 51-50-0909, filed 2/1/13, effective 7/1/13. Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 10-03-097, § 51-50-0909, filed 1/20/10, effective 7/1/10. Statutory Authority: RCW 19.27.074, 19.27.020, and chapters 70.92, 19.27, and 34.05 RCW. WSR 07-01-091, § 51-50-0909, filed 12/19/06, effective 7/1/07. Statutory Authority: RCW 19.27.020, 19.27.031, 19.27.074, and chapters 19.27 and 34.05 RCW. WSR 05-24-070, § 51-50-0909, filed 12/5/05, effective 7/1/06. Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 04-01-108, § 51-50-0909, filed 12/17/03, effective 7/1/04.

Wash. Admin. Code § 51-50-0911 Section 911—Fire command center.

911.1.2 Separation. The fire command center shall be separated from the remainder of the building by not less than a one 2-hour fire barrier constructed in accordance with Section 707 or horizontal assembly constructed in accordance with Section 711, or both.

History

• Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 22-13-094, 23-12-103, and 23-20-023, § 51-50-0911, filed 6/14/22, 6/7/23, and 9/25/23, effective 3/15/24
• WSR 16-03-064, § 51-50-0911, filed 1/19/16, effective 7/1/16
• WSR 10-03-097, § 51-50-0911, filed 1/20/10, effective 7/1/10.

Wash. Admin. Code § 51-50-0913 Section 913—Fire pumps.

913.2.1 Protection of fire pump rooms and access. Fire pumps shall be located in rooms that are separated from all other areas of the building by 2-hour fire barriers constructed in accordance with Section 707 or 2-hour horizontal assemblies constructed in accordance with Section 711, or both. Fire pump rooms not directly accessible from the outside shall be accessible through an enclosed passageway from an interior exit stairway or exterior exit. The enclosed passageway shall have a fire-resistance rating not less than the fire-resistance rating of the fire pump room (see NFPA 20 Section 4.14.2.1.2).

History

• Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 22-13-094, 23-12-103, and 23-20-023, § 51-50-0913, filed 6/14/22, 6/7/23, and 9/25/23, effective 3/15/24
• WSR 20-01-090, § 51-50-0913, filed 12/12/19, effective 7/1/20.

Wash. Admin. Code § 51-50-0915 Section 915—Carbon monoxide detection.

915.1.1 Where required. Carbon monoxide detection shall be provided in Group I and R occupancies and in classrooms in Group E occupancies in the locations specified in Section 915.2 where any of the conditions in Sections 915.1.2 through 915.1.6 exist.

| EXCEPTIONS: | 1. R-2 occupancies, with the exception of R-2 college dormitories, are required to install carbon monoxide detectors without exception. | | --- | --- | | | 2. Sleeping units or dwelling units in I and R-1 occupancies and R-2 college dormitories, hotel, DOC prisons and work releases and DSHS licensed boarding home and residential treatment facility occupancies which do not themselves contain a fuel-burning appliance, a fuel-burning fireplace, or have an attached garage, need not be provided with carbon monoxide alarms provided that they comply with the exceptions of 915.1.4. |

915.2.3 Group E occupancies. When required by Section 915.1 in new buildings, or by Chapter 11 of the International Fire Code, carbon monoxide detection shall be installed in classrooms in Group E occupancies. Carbon monoxide alarm signals shall be automatically transmitted to an on-site location that is staffed by school personnel.

| EXCEPTIONS: | 1. Carbon monoxide alarm signals shall not be required to be automatically transmitted to an on-site location that is staffed by school personnel in Group E occupancies with an occupant load of 50 or less. | | --- | --- | | | 2. Carbon monoxide alarm signals shall not be required to be automatically transmitted to an on-site location that is staffed by school personnel in Group E occupancies where an exception contained in Section 915.1 applies, or in Group E occupancies where signals are transmitted to an off-site service monitored by a third party, such as a service that monitors fire protection systems in the building. |

History

• Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 22-13-094, 23-12-103, and 23-20-023, § 51-50-0915, filed 6/14/22, 6/7/23, and 9/25/23, effective 3/15/24
• WSR 16-03-064, § 51-50-0915, filed 1/19/16, effective 7/1/16.

Wash. Admin. Code § 51-50-0918 Section 918—Emergency responder communication coverage enhancement.

918.1 General. In-building emergency responder communication enhancement system shall be provided in all new buildings in accordance with Section 510 of the International Fire Code.

History

• Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 22-13-094, 23-12-103, and 23-20-023, § 51-50-0918, filed 6/14/22, 6/7/23, and 9/25/23, effective 3/15/24.

Wash. Admin. Code § 51-50-1003 Section 1003—General means of egress.

1003.7 Elevators, escalators and moving walks. Elevators, escalators and moving walks shall not be used as a component of a required means of egress from any other part of the building.

| EXCEPTIONS: | 1. Elevators used as an accessible means of egress in accordance with Section 1009.4. | | --- | --- | | | 2. Escalators used as a means of egress for fixed transit and passenger rail system accordance with Section 3116. |

History

• Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 22-13-094, 23-12-103, and 23-20-023, § 51-50-1003, filed 6/14/22, 6/7/23, and 9/25/23, effective 3/15/24.

Wash. Admin. Code § 51-50-1004 Section 1004—Occupant load.

Table 1004.5

Maximum Floor Area Allowance Per Occupant

| FUNCTION OF SPACE | OCCUPANT LOAD FACTORa | | | --- | --- | --- | | Accessory storage areas, mechanical equipment room | 300 gross | | | Agricultural building | 300 gross | | | Aircraft hangars | 500 gross | | | Airport terminal | | | | | Baggage claim | 20 gross | | | Baggage handling | 300 gross | | | Concourse | 100 gross | | | Waiting areas | 15 gross | | Assembly | | | | | Gaming floors (keno, slots, etc.) | 11 gross | | | Exhibit gallery and museum | 30 net | | | Billiard table/game table area | 50 gross | | Assembly with fixed seats | See Section 1004.6 | | | Assembly without fixed seats | | | | | Concentrated (chairs only - not fixed) | 7 net | | | Standing space | 5 net | | | Unconcentrated (tables and chairs) | 15 net | | Bowling centers, allow 5 persons for each lane including 15 feet of runway, and for additional areas | 7 net | | | Business areas | | | | | Concentrated business use areas | 150 gross (See Section 1004.8) | | Courtrooms - Other than fixed seating areas | 40 net | | | Day care | 35 net | | | Dormitories | 50 gross | | | Educational | | | | | Classroom area | 20 net | | | Shops and other vocational room areas | 50 net | | Exercise rooms | 50 gross | | | Fixed guideway transit and passenger rail systems Platform Concourse/lobby | 100 gross (See Section 3116) | | | Group H-5 fabrication and manufacturing areas | 200 gross | | | Industrial areas | 100 gross | | | Institutional areas | | | | | Inpatient treatment areas | 240 gross | | | Outpatient areas | 100 gross | | | Sleeping areas | 120 gross | | Kitchens, commercial | 200 gross | | | Library | | | | | Reading rooms | 50 net | | | Stack area | 100 gross | | Locker rooms | 50 gross | | | Mall buildings - Covered and open | See Section 402.8.2 | | | Mercantile | 60 gross | | | | Storage, stock, shipping areas | 300 gross | | Parking garages | 200 gross | | | Residential | 200 gross | | | Skating rinks, swimming pools | | | | | Rink and pool | 50 gross | | | Decks | 15 gross | | Stages and platforms | 15 net | | | Warehouses | 500 gross | |

| a | Floor area in square feet per occupant. | | --- | --- |

History

• Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 23-23-102, § 51-50-1004, filed 11/15/23, effective 3/16/24
• WSR 22-13-094, 23-12-103, and 23-20-023, § 51-50-1004, filed 6/14/22, 6/7/23, and 9/25/23, effective 3/15/24
• WSR 20-01-090, § 51-50-1004, filed 12/12/19, effective 7/1/20
• WSR 19-02-038, § 51-50-1004, filed 12/26/18, effective 7/1/19
• WSR 16-03-064, § 51-50-1004, filed 1/19/16, effective 7/1/16.

Wash. Admin. Code § 51-50-1005 Section 1005—Means of egress sizing.

1005.1 General. All portions of the means of egress system shall be sized in accordance with this section.

| EXCEPTIONS: | 1. Aisles and aisle accessways in rooms or spaces used for assembly purposes complying with Section 1030. | | --- | --- | | | 2. The capacity in inches, of means of egress components for fixed guideway transit and passenger rail stations, shall meet the requirements of Section 3116. |

History

• Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 22-13-094, 23-12-103, and 23-20-023, § 51-50-1005, filed 6/14/22, 6/7/23, and 9/25/23, effective 3/15/24. Statutory Authority: RCW 19.27.031 and chapters 19.27 and 34.05 RCW. WSR 13-04-067, § 51-50-1005, filed 2/1/13, effective 7/1/13. Statutory Authority: Chapter 19.27 RCW. WSR 10-24-059, § 51-50-1005, filed 11/29/10, effective 7/1/11.

Wash. Admin. Code § 51-50-1006 Section 1006—Number of exits and exit access doorways.

Table 1006.2.1

Spaces with One Exit or Exit Access Doorway

| OCCUPANCY | MAXIMUM OCCUPANT LOAD OF SPACE | MAXIMUM COMMON PATH OF EGRESS TRAVEL DISTANCE (feet) | | | | --- | --- | --- | --- | --- | | Without Sprinkler System (feet) | With Sprinkler System (feet) | | | | | Occupant Load | | | | | | OL ≤ 30 | OL ˃ 30 | | | | | Ac, Eh, M | 49 | 75 | 75 | 75a | | B | 49 | 100 | 75 | 100a | | F | 49 | 75 | 75 | 100a | | H-1, H-2, H-3 | 3 | NP | NP | 25b | | H-4, H-5 | 10 | NP | NP | 75b | | I-1, I-2d, I-4 | 10 | NP | NP | 75a | | I-3 | 10 | NP | NP | 100a | | R-1 | 10 | NP | NP | 75a | | R-2 | 20 | NP | NP | 125a | | R-3e | 20 | NP | NP | 125a,g | | R-4e | 20 | NP | NP | 125a,g | | Sf | 29 | 100 | 75 | 100a | | U | 49 | 100 | 75 | 75a |

| For SI: 1 foot = 304.8 mm. | | | | --- | --- | --- | | NP = Not Permitted. | | | | | a | Buildings equipped throughout with an automatic sprinkler system in accordance with Section 903.3.1.1 or 903.3.1.2. See Section 903 for occupancies where automatic sprinkler systems are permitted in accordance with Section 903.3.1.2. | | | b | Group H occupancies equipped throughout with an automatic sprinkler system in accordance with Section 903.2.5. | | | c | For a room or space used for assembly purposes having fixed seating, see Section 1029.8. | | | d | For the travel distance limitations in Group I-2, see Section 407.4. | | | e | The common path of egress travel distance shall only apply in a Group R-3 occupancy located in a mixed occupancy building. | | | f | The length of common path of egress travel distance in a Group S-2 open parking garage shall be not more than 100 feet. | | | g | For the travel distance limitations in Groups R-3 and R-4 equipped throughout with an automatic sprinkler system in accordance with Section 903.3.1.3, see Section 1006.2.2.6. | | | h | Day care facilities, rooms or spaces where care is provided for more than 10 children that are 2 1/2 years of age or less, shall have access to not less than two exits or exit access doorways. |

1006.2.1 Egress based on occupant load and common path of egress travel distance. Two exits or exit access doorways from any space shall be provided where the design occupant load or the common path of egress travel distance exceeds the values listed in Table 1006.2.1. The cumulative occupant load from adjacent rooms, areas or spaces shall be determined in accordance with Section 1004.2.

| EXCEPTIONS: | 1. The number of exits from foyers, lobbies, vestibules or similar spaces need not be based on cumulative occupant loads for areas discharging through such spaces, but the capacity of the exits from such spaces shall be based on applicable cumulative occupant loads. | | --- | --- | | | 2. Care suites in Group I-2 occupancies complying with Section 407.4. | | | 3. Unoccupied mechanical rooms and penthouses are not required to comply with the common path of egress travel distance measurement. | | | 4. The common path of travel for fixed transit and passenger rail system stations shall be in accordance with Section 3116. |

1006.2.1.1 Three or more exits or exit access doorways. Three exits or exit access doorways shall be provided from any space with an occupant load of 501 to 1,000. Four exits or exit access doorways shall be provided from any space with an occupant load greater than 1,000.

| EXCEPTION: | The number of required exits for fixed transit and passenger rail systems may be reduced by one at open stations. | | --- | --- |

1006.3.4 Single exits. A single exit or access to a single exit shall be permitted from any story or occupied roof where one of the following conditions exists:

1. The occupant load, number of dwelling units and exit access travel distance within the portion of the building served by the single exit do not exceed the values in Table 1006.3.4(1) or 1006.3.4(2).

2. Rooms, areas and spaces complying with Section 1006.2.1 with exits that discharge directly to the exterior at the level of exit discharge, are permitted to have one exit or access to a single exit.

3. Parking garages where vehicles are mechanically parked shall be permitted to have one exit or access to a single exit.

4. Groups R-3 and R-4 occupancies shall be permitted to have one exit or access to a single exit.

5. Individual single-story or multistory dwelling units shall be permitted to have a single exit or access to a single exit from the dwelling unit provided that both of the following criteria are met:

5.1. The dwelling unit complies with Section 1006.2.1 as a space with one means of egress.

5.2. Either the exit from the dwelling unit discharges directly to the exterior at the level of exit discharge, or the exit access outside the dwelling unit's entrance door provides access to not less than two approved independent exits.

History

• Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 23-23-102, § 51-50-1006, filed 11/15/23, effective 3/16/24
• WSR 22-13-094, 23-12-103, and 23-20-023, § 51-50-1006, filed 6/14/22, 6/7/23, and 9/25/23, effective 3/15/24
• WSR 20-21-021, § 51-50-1006, filed 10/9/20, effective 11/9/20
• WSR 20-01-090, § 51-50-1006, filed 12/12/19, effective 7/1/20
• WSR 16-03-064, § 51-50-1006, filed 1/19/16, effective 7/1/16.

Wash. Admin. Code § 51-50-1007 Section 1007—Reserved.

History

• Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 16-03-064, § 51-50-1007, filed 1/19/16, effective 7/1/16
• WSR 10-03-097, § 51-50-1007, filed 1/20/10, effective 7/1/10.

Wash. Admin. Code § 51-50-1008 Section 1008—Means of egress illumination.

1008.2.3 Exit discharge. This subsection not adopted.

History

• Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 20-01-103, § 51-50-1008, filed 12/13/19, effective 7/1/20
• WSR 16-03-064, § 51-50-1008, filed 1/19/16, effective 7/1/16. Statutory Authority: RCW 19.27.031 and chapters 19.27 and 34.05 RCW. WSR 13-04-067, § 51-50-1008, filed 2/1/13, effective 7/1/13. Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 10-03-097, § 51-50-1008, filed 1/20/10, effective 7/1/10. Statutory Authority: RCW 19.27.074, 19.27.020, and chapters 70.92, 19.27, and 34.05 RCW. WSR 07-01-091, § 51-50-1008, filed 12/19/06, effective 7/1/07. Statutory Authority: RCW 19.27.020, 19.27.031, 19.27.074, and chapters 19.27 and 34.05 RCW. WSR 05-24-070, § 51-50-1008, filed 12/5/05, effective 7/1/06. Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 04-01-108, § 51-50-1008, filed 12/17/03, effective 7/1/04.

Wash. Admin. Code § 51-50-1009 Section 1009—Accessible means of egress.

1009.1 Accessible means of egress required.Accessiblemeans of egress shall comply with this section. Accessible spaces shall be provided with not less than one accessible means of egress. Where more than one means of egress is required by Section 1006.2 or 1006.3 from any accessible space, each accessible portion of the space shall be served by not less than two accessible means of egress.

| EXCEPTIONS: | 1. Accessible means of egress are not required to be provided in existing buildings. | | --- | --- | | | 2. One accessible means of egress is required from an accessible mezzanine level in accordance with Section 1009.3, 1009.4 or 1009.5. | | | 3. In assembly areas with ramped aisles or stepped aisles, one accessible means of egress is permitted where the common path of egress travel is accessible and meets the requirements in Section 1030.8. | | | 4. In parking garages, accessible means of egress are not required to serve parking areas that do not contain accessible parking spaces. |

1009.8 Two-way communication. A two-way communication system complying with Sections 1009.8.1 and 1009.8.2 shall be provided at the landing serving each elevator or bank of elevators on each accessible floor that is one or more stories above or below the level of exit discharge.

| EXCEPTIONS: | 1. Two-way communication systems are not required at the landing serving each elevator or bank of elevators where the two-way communication system is provided within areas of refuge in accordance with Section 1009.6.5. | | --- | --- | | | 2. Two-way communication systems are not required on floors provided with ramps that provide a direct path of egress travel to grade or the level of exit discharge conforming to the provisions of Section 1012. | | | 3. Two-way communication systems are not required at the landings serving only service elevators that are not designated as part of the accessible means of egress or serve as part of the required accessible route into a facility. | | | 4. Two-way communication systems are not required at the landings serving only freight elevators. | | | 5. Two-way communication systems are not required at the landing serving a private residence elevator. | | | 6. Two-way communication systems are not required in Group I-2 or I-3 facilities. |

1009.8.1 System requirements. Two-way communication systems shall provide communication between each required location and the fire command center or a central control point location approved by the fire department. Where the central control point is not a constantly attended location, a two-way communication system shall have a timed automatic telephone dial-out capability that provides two-way communication with an approved supervising station. The two-way communication system shall include both audible and visible signals. The two-way communication system shall have a battery backup or an approved alternate source of power that is capable of 90 minutes use upon failure of the normal power source.

History

• Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 22-13-094, 23-12-103, and 23-20-023, § 51-50-1009, filed 6/14/22, 6/7/23, and 9/25/23, effective 3/15/24
• WSR 20-21-021, § 51-50-1009, filed 10/9/20, effective 11/9/20
• WSR 20-01-090, § 51-50-1009, filed 12/12/19, effective 7/1/20
• WSR 16-03-064, § 51-50-1009, filed 1/19/16, effective 7/1/16. Statutory Authority: RCW 19.27.031 and chapters 19.27 and 34.05 RCW. WSR 13-04-067, § 51-50-1009, filed 2/1/13, effective 7/1/13. Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 10-03-097, § 51-50-1009, filed 1/20/10, effective 7/1/10. Statutory Authority: RCW 19.27.074, 19.27.020, and chapters 70.92, 19.27, and 34.05 RCW. WSR 07-01-091, § 51-50-1009, filed 12/19/06, effective 7/1/07. Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 04-01-108, § 51-50-1009, filed 12/17/03, effective 7/1/04.

Wash. Admin. Code § 51-50-10100 Section 1010—Doors, gates, and turnstiles.

1010.2.4 Locks and latches. Locks and latches shall be permitted to prevent operation of doors where any of the following exists:

1. Places of detention or restraint.

2. Approved, listed locks without delayed egress shall be permitted in Group I-1 condition 2 assisted living facilities licensed by the state of Washington, provided that:

2.1. The clinical needs of one or more patients require specialized security measures for their safety.

2.2. The doors unlock upon actuation of the automatic sprinkler system or automatic fire detection system.

2.3. The doors unlock upon loss of electrical power controlling the lock or lock mechanism.

2.4. The lock shall be capable of being deactivated by a signal from a switch located in an approved location.

2.5. There is a system, such as a keypad and code, in place that allows visitors, staff persons and appropriate residents to exit. Instructions for exiting shall be posted within six feet of the door.

3. In buildings in occupancy Group A having an occupant load of 300 or less, Groups B, F, M and S, and in places of religious worship, the main door or doors are permitted to be equipped with key-operated locking devices from the egress side, provided:

3.1. The locking device is readily distinguishable as locked.

3.2. A readily visible and durable sign is posted on the egress side on or adjacent to the door stating: THIS DOOR TO REMAIN UNLOCKED WHEN THIS SPACE IS OCCUPIED. The sign shall be in letters 1 inch (25 mm) high on a contrasting background.

3.3. The use of the key-operated locking device is revocable by the building official for due cause.

4. Where egress doors are used in pairs, approved automatic flush bolts shall be permitted to be used, provided that the door leaf having the automatic flush bolts has no doorknob or surface-mounted hardware.

5. Doors from individual dwelling or sleeping units of Group R occupancies having an occupant load of 10 or less are permitted to be equipped with a night latch, dead bolt, or security chain, provided such devices are openable from the inside without the use of a key or a tool.

6. Fire doors after the minimum elevated temperature has disabled the unlatching mechanism in accordance with listed fire door test procedures.

7. Doors serving roofs not intended to be occupied shall be permitted to be locked preventing entry to the building from the roof.

8. Other than egress courts, where occupants must egress from an exterior space through the building for means of egress, exit access doors shall be permitted to be equipped with an approved locking device where installed and operated in accordance with all of the following:

8.1. The maximum occupant load shall be posted where required by Section 1004.9. Such signage shall be permanently affixed inside the building and shall be posted in a conspicuous space near all the exit access doorways.

8.2. A weatherproof telephone or two-way communication system installed in accordance with Sections 1009.8.1 and 1009.8.2 shall be located adjacent to not less than one required exit access door on the exterior side.

8.3. The egress door locking device is readily distinguishable as locked and shall be a key-operated locking device.

8.4. A clear window or glazed door opening, not less than 5 square feet (0.46 m2) in area, shall be provided at each exit access door to determine if there are occupants using the outdoor area.

8.5. A readily visible durable sign shall be posted on the interior side on or adjacent to each locked required exit access door serving the exterior area stating: THIS DOOR TO REMAIN UNLOCKED WHEN THE OUTDOOR AREA IS OCCUPIED. The letters on the sign shall be not less than 1 inch high on a contrasting background.

8.6. The occupant load of the occupied exterior area shall not exceed 300 occupants in accordance with Section 1004.

9. Locking devices are permitted on doors to balconies, decks or other exterior spaces serving individual dwelling or sleeping units.

10. Locking devices are permitted on doors to balconies, decks or other exterior spaces of 250 square feet or less, serving a private office space.

1010.2.14 Controlled egress doors in Groups I-1 and I-2. Electric locking systems, including electromechanical locking systems and electromagnetic locking systems, shall be permitted to be locked in the means of egress in Group I-1 or I-2 occupancies where the clinical needs of persons receiving care require their containment. Controlled egress doors shall be permitted in such occupancies where the building is equipped throughout with an automatic sprinkler system in accordance with Section 903.3.1.1 or an approved automatic smoke detection system installed in accordance with Section 907, provided that the doors are installed and operate in accordance with all of the following:

1. The door locks shall unlock on actuation of the automatic sprinkler system or automatic smoke detection system.

2. The doors locks shall unlock on loss of power controlling the lock or lock mechanism.

3. The door locking system shall be installed to have the capability of being unlocked by a switch located at the fire command center, a nursing station or other approved location. The switch shall directly break power to the lock.

4. A building occupant shall not be required to pass through more than one door equipped with a controlled egress locking system before entering an exit.

5. The procedures for unlocking the doors shall be described and approved as part of the emergency planning and preparedness required by Chapter 4 of the International Fire Code.

6. There is a system, such as a keypad and code, in place that allows visitors, staff persons and appropriate residents to exit. Instructions for exiting shall be posted within six feet of the door. All clinical staff shall have the keys, codes or other means necessary to operate the locking systems.

7. Emergency lighting shall be provided at the door.

8. The door locking system units shall be listed in accordance with UL 294.

| EXCEPTIONS: | 1. Items 1 through 4, and 6, shall not apply to doors to areas occupied by persons who, because of clinical needs, require restraint or containment as part of the function of a psychiatric or cognitive treatment area, provided that all clinical staff shall have the keys, codes or other means necessary to operate the locking devices. | | --- | --- | | | 2. Items 1 through 4, and 6, shall not apply to doors to areas where a listed egress control system is utilized to reduce the risk of child abduction from nursery and obstetric areas of a Group I-2 hospital. |

1010.3.4.1 Fixed transit and passenger rail systems. In fixed transit and passenger rail system stations, horizontal and vertical security grilles are permitted at station entrances as a component in the means of egress when the station is under constant supervision by on-site security personnel and an exit door with panic hardware that swings in the direction of egress, with a minimum clear width of 32 inches, provided within 10 feet of the gate. The security grilles shall remain secured in the full-open position during the period of occupancy by the general public.

History

• Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 22-13-094, 23-12-103, and 23-20-023, § 51-50-10100, filed 6/14/22, 6/7/23, and 9/25/23, effective 3/15/24
• WSR 20-01-090, § 51-50-10100, filed 12/12/19, effective 7/1/20
• WSR 16-03-064, § 51-50-10100, filed 1/19/16, effective 7/1/16. Statutory Authority: RCW 19.27.031 and chapters 19.27 and 34.05 RCW. WSR 13-04-067, § 51-50-10100, filed 2/1/13, effective 7/1/13. Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 10-03-097, § 51-50-10100, filed 1/20/10, effective 7/1/10.

Wash. Admin. Code § 51-50-1011 Section 1011—Stairways.

1011.1 General. Stairways serving occupied portions of a building shall comply with the requirements of Sections 1011.2 through 1011.13. Alternating tread devices shall comply with Section 1011.14. Ship's ladders shall comply with Section 1011.15. Ladders shall comply with Section 1011.16.

| EXCEPTIONS: | 1. Within rooms or spaces used for assembly purposes, stepped aisles shall comply with Section 1029. | | --- | --- | | | 2. Stairways, alternating tread devices, ship's ladders, or ladders within an individual dwelling unit or sleeping unit used for egress from areas of 200 square feet (18.6 m2) or less, and not containing the primary bathroom or kitchen, are exempt from the requirements of Section 1011. Such areas shall not be located more than 10 feet (3048 mm) above the finished floor of the space below. |

History

• Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 22-13-094, 23-12-103, and 23-20-023, § 51-50-1011, filed 6/14/22, 6/7/23, and 9/25/23, effective 3/15/24
• WSR 20-01-090, § 51-50-1011, filed 12/12/19, effective 7/1/20
• WSR 16-03-064, § 51-50-1011, filed 1/19/16, effective 7/1/16.

Wash. Admin. Code § 51-50-1012 Section 1012—Ramps.

1012.1 Scope. The provisions of this section shall apply to ramps used as a component of a means of egress.

| EXCEPTIONS: | 1. Ramped aisles within assembly rooms or spaces shall comply with the provisions in Section 1030.13. | | --- | --- | | | 2. Curb ramps shall comply with ICC A117.1. | | | 3. Vehicle ramps in parking garages for pedestrian exit access shall not be required to comply with Sections 1012.3 through 1012.10 where they are not an accessible route serving accessible parking spaces, other required accessible elements, or part of an accessible means of egress. | | | 4. In a parking garage where one accessible means of egress serving accessible parking spaces or other accessible elements is provided, a second accessible means of egress serving that area may include a vehicle ramp that does not comply with Sections 1012.5, 1012.6, and 1012.9. A landing complying with Sections 1012.6.1 and 1012.6.4 shall be provided at any change of direction in the accessible means of egress. |

History

• Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 22-13-094, 23-12-103, and 23-20-023, § 51-50-1012, filed 6/14/22, 6/7/23, and 9/25/23, effective 3/15/24
• WSR 16-03-064, § 51-50-1012, filed 1/19/16, effective 7/1/16.

Wash. Admin. Code § 51-50-1014 Section 1014—Handrails.

1014.2 Height and location. Handrails serving flights of stairways, ramps, stepped aisles, and ramped aisles shall comply with the provisions of Sections 1014.2.1 and 1014.2.2.

1014.2.1 Height. Handrail height, measured above stair tread nosings, or finish surface of ramp slope, shall be uniform, not less than 34 inches (864 mm) and not more than 38 inches (965 mm). Handrail height of alternating tread devices and ships ladders, measured above tread nosings, shall be uniform, not less than 30 inches (762 mm) and not more than 34 inches (864 mm).

| EXCEPTIONS: | 1. Where handrail fittings or bendings are used to provide continuous transition between flights, the fittings or bendings shall be permitted to exceed the maximum height. | | --- | --- | | | 2. In Group R-3 occupancies; within dwelling units in Group R-2 occupancies; and in Group U occupancies that are associated with a Group R-3 occupancy or associated with individual dwelling units in Group R-2 occupancies; where handrail fittings or bendings are used to provide continuous transition between flights, transition at winder treads, transition from handrail to guard, or where used at the start of a flight, the handrail height at the fittings or bendings shall be permitted to exceed the maximum height. | | | 3. Handrails on top of a guard where permitted along stepped aisles and ramped aisles in accordance with Section 1030.16. |

1014.2.2 Lateral location. Handrails located outward from the edge of the walking surface of flights of stairways, ramps, stepped aisles, and ramped aisles shall be located within 6 inches (152.4 mm) measured horizontally from the edge of the walking surface. Handrails projecting into the width of the walking surface shall comply with Section 1014.8.

1014.8 Projections. On ramps and on ramped aisles that are part of an accessible route, the clear width between handrails shall be 36 inches (914 mm) minimum. Projections into the required width of stepped and ramped aisles, flights of stairways and ramps at each side shall not exceed 4.5 inches (114 mm) at or below the handrail height. Projections into the required width shall not be limited above the minimum headroom height required in Section 1011.3. Projections due to intermediate handrails shall not constitute a reduction in the egress width. Where a pair of intermediate handrails are provided within the stairway width without a walking surface between the pair of intermediate handrails and the distance between the pair of intermediate handrails is greater than 6 inches (152 mm), the available egress width shall be reduced by the distance between the closest edges of each such intermediate pair of handrails that is greater than 6 inches (152 mm).

History

• Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 22-13-094, 23-12-103, and 23-20-023, § 51-50-1014, filed 6/14/22, 6/7/23, and 9/25/23, effective 3/15/24. Statutory Authority: RCW 19.27.031 and chapters 19.27 and 34.05 RCW. WSR 13-04-067, § 51-50-1014, filed 2/1/13, effective 7/1/13. Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 10-03-097, § 51-50-1014, filed 1/20/10, effective 7/1/10. Statutory Authority: RCW 19.27.074, 19.27.020, and chapters 70.92, 19.27, and 34.05 RCW. WSR 07-01-091, § 51-50-1014, filed 12/19/06, effective 7/1/07.

Wash. Admin. Code § 51-50-1015 Section 1015—Guards.

1015.2 Where required.Guards shall be located along open-sided walking surfaces, including mezzanines, equipment platforms, lofts in accordance with Section 420.14, aisles, stairs, ramps and landings that are located more than 30 inches (762 mm) measured vertically to the floor or grade below at any point within 36 inches (914 mm) horizontally to the edge of the open side. Guards shall be provided at the perimeter of the occupied portions of an occupied roof. Guards shall be adequate in strength and attachment in accordance with Section 1607.9.

| EXCEPTION: | Guards are not required for the following locations: | | --- | --- | | | 1. On the loading side of loading docks or piers. | | | 2. On the audience side of stages and raised platforms, including stairs leading up to the stage and raised platforms. | | | 3. On raised stage and platform floor areas, such as runways, ramps and side stages used for entertainment or presentations. | | | 4. At vertical openings in the performance area of stages and platforms. | | | 5. At elevated walking surfaces appurtenant to stages and platforms for access to and utilization of special lighting or equipment. | | | 6. Along vehicle service pits not accessible to the public. | | | 7. In assembly seating areas at cross aisles in accordance with Section 1030.17.2. | | | 8. On the loading side of station platforms on fixed guideway transit or passenger rail stations. | | | 9. Portions of an occupied roof located less than 30 inches measured vertically to adjacent unoccupied roof areas when approved guards are present at the perimeter of the roof. | | | 10. At an occupied portion of an occupied roof where a barrier approved by the building official is provided. |

1015.3 Height. Required guards shall be not less than 42 inches (1067 mm) high, measured vertically as follows:

1. From the adjacent walking surfaces.

2. On stairways and stepped aisles, from the line connecting the leading edges of the tread nosings.

3. On ramps and ramped aisles, from the ramp surface at the guard.

| EXCEPTIONS: | 1. For occupancies in Group R-3 not more than three stories above grade in height and within individual dwelling units in occupancies in Group R-2 not more than three stories above grade in height with separate means of egress, required guards shall be not less than 36 inches (914 mm) in height measured vertically above the adjacent walking surfaces. | | --- | --- | | | 2. For occupancies in Group R-3, and within individual dwelling units in occupancies in Group R-2, guards on the open sides of stairs shall have a height not less than 34 inches (864 mm) measured vertically from a line connecting the leading edges of the treads. | | | 3. For occupancies in Group R-3, and within individual dwelling units in occupancies in Group R-2, where the top of the guard serves as a handrail on the open sides of stairs, the top of the guard shall be not less than 34 inches (864 mm) and not more than 38 inches (965 mm) measured vertically from a line connecting the leading edges of the treads. | | | 4. In areas with ceiling heights of 7 feet (2134 mm) or less in lofts constructed in accordance with Section 420.14, guards shall not be less than 36 inches (914 mm) in height or one-half of the clear height from the loft floor to the loft ceiling, whichever is less. | | | 5. The guard height in assembly seating areas shall comply with Section 1030.17 as applicable. | | | 6. Along alternating tread devices and ships ladders, guards where the top rail serves as a handrail shall have height not less than 30 inches (762 mm) and not more than 34 inches (864 mm), measured vertically from the leading edge of the device tread nosing. | | | 7. In Group F occupancies where exit access stairways serve fewer than three stories and such stairways are not open to the public, and where the top of the guard also serves as a handrail, the top of the guard shall be not less than 34 inches (864 mm) and not more than 38 inches (965 mm) measured vertically from a line connecting the leading edges of the treads. |

History

• Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 22-13-094, 23-12-103, and 23-20-023, § 51-50-1015, filed 6/14/22, 6/7/23, and 9/25/23, effective 3/15/24
• WSR 10-03-097, § 51-50-1015, filed 1/20/10, effective 7/1/10. Statutory Authority: RCW 19.27.074, 19.27.020, and chapters 70.92, 19.27, and 34.05 RCW. WSR 07-01-091, § 51-50-1015, filed 12/19/06, effective 7/1/07.

Wash. Admin. Code § 51-50-10170 Section 1017—Exit access travel distance.

Table 1017.2

Exit Access Travel Distancea

| Occupancy | Without Sprinkler System (feet) | With Sprinkler System (feet) | | --- | --- | --- | | A, E, F-1, M, R, S-1 | 200e | 250b | | I-1 | Not Permitted | 250b | | B | 200 | 300c | | F-2, S-2, U | 300 | 400c | | H-1 | Not Permitted | 75d | | H-2 | Not Permitted | 100d | | H-3 | Not Permitted | 150d | | H-4 | Not Permitted | 175d | | H-5 | Not Permitted | 200c | | I-2, I-3 | Not Permitted | 200c | | l-4 | 150 | 200c |

| For SI: 1 foot = 304.8 mm. | | | --- | --- | | a | See the following sections for modifications to exit access travel distance requirements: | | | • Section 402.8: For the distance limitation in malls. | | | • Section 407.4: For the distance limitation in Group I-2. | | | • Sections 408.6.1 and 408.8.1: For the distance limitations in Group I-3. | | | • Section 411.2: For the distance limitation in special amusement areas. | | | • Section 412.6: For the distance limitations in aircraft manufacturing facilities. | | | • Section 1006.2.2.2: For the distance limitation in refrigeration machinery rooms. | | | • Section 1006.2.2.3: For the distance limitation in refrigerated rooms and spaces. | | | • Section 1006.3.4: For buildings with one exit. | | | • Section 1017.2.2: For increased distance limitation in Groups F-1 and S-1. | | | • Section 1030.7: For increased limitation in assembly seating. | | | • Section 3103.4: For temporary structures. | | | • Section 3104.9: For pedestrian walkways. | | | • Section 3116: For fixed guideway and passenger rail stations. | | b | Buildings equipped throughout with an automatic sprinkler system in accordance with Section 903.3.1.1 or 903.3.1.2. See Section 903 for occupancies where automatic sprinkler systems are permitted in accordance with Section 903.3.1.2. | | c | Buildings equipped throughout with an automatic sprinkler system in accordance with Section 903.3.1.1. | | d | Group H occupancies equipped throughout with an automatic sprinkler system in accordance with Section 903.2.5.1. | | e | Group R-3 and R-4 buildings equipped throughout with an automatic sprinkler system in accordance with Section 903.3.1.3. See Section 903.2.8 for occupancies where automatic sprinkler systems are permitted in accordance with Section 903.3.1.3. |

History

• Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 23-22-115, § 51-50-10170, filed 10/31/23, effective 3/15/24
• WSR 22-13-094, 23-12-103, and 23-20-023, § 51-50-10170, filed 6/14/22, 6/7/23, and 9/25/23, effective 3/15/24.

Wash. Admin. Code § 51-50-1018 Section 1018—Reserved.

History

• Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 16-03-064, § 51-50-1018, filed 1/19/16, effective 7/1/16. Statutory Authority: RCW 19.27.031 and chapters 19.27 and 34.05 RCW. WSR 13-04-067, § 51-50-1018, filed 2/1/13, effective 7/1/13. Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 10-03-097, amended and recodified as § 51-50-1018, filed 1/20/10, effective 7/1/10. Statutory Authority: RCW 19.27.074, 19.27.020, and chapters 70.92, 19.27, and 34.05 RCW. WSR 07-01-091, § 51-50-1017, filed 12/19/06, effective 7/1/07.

Wash. Admin. Code § 51-50-1019 Reserved.

History

• Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 23-22-115, § 51-50-1019, filed 10/31/23, effective 3/15/24
• WSR 22-13-094, 23-12-103, and 23-20-023, § 51-50-1019, filed 6/14/22, 6/7/23, and 9/25/23, effective 3/15/24
• WSR 20-21-021, § 51-50-1019, filed 10/9/20, effective 11/9/20
• WSR 20-01-090, § 51-50-1019, filed 12/12/19, effective 7/1/20
• WSR 10-03-097, § 51-50-1019, filed 1/20/10, effective 7/1/10. Statutory Authority: RCW 19.27.074, 19.27.020, and chapters 70.92, 19.27, and 34.05 RCW. WSR 07-01-091, § 51-50-1019, filed 12/19/06, effective 7/1/07.

Wash. Admin. Code § 51-50-1020 Section 1020—Corridors.

1020.6 Air movement in corridors.Corridors shall not serve as supply, return, exhaust, relief, or ventilation air ducts.

| EXCEPTIONS: | 1. Use of a corridor as a source of makeup air for exhaust systems in rooms that open directly onto such corridors, including toilet rooms, bathrooms, dressing rooms, smoking lounges and janitor closets, shall be permitted provided that each such corridor is directly supplied with outdoor air at a rate greater than the rate of makeup air taken from the corridor. | | --- | --- | | | 2. Where located within a dwelling unit, the use of corridors for conveying return air shall not be prohibited. | | | 3. Where located within tenant spaces of 1,000 square feet (93 m2) or less in area, utilization of corridors for conveying return air is permitted. | | | 4. Transfer air movement required to maintain the pressurization difference within health care facilities in accordance with ASHRAE 170. | | | 5. Where such air is part of an engineered smoke control system. | | | 6. Air supplied to corridors serving residential occupancies shall not be considered as providing ventilation air to the dwelling units and sleeping units subject to the following: | | | 6.1 The air supplied to the corridor is 100 percent outside air; and | | | 6.2 The units served by the corridor have conforming ventilation air independent of the air supplied to the corridor; and | | | 6.3 For other than high-rise buildings, the supply fan will automatically shut off upon activation of corridor smoke detectors which shall be spaced at no more than 30 feet (9,144 mm) on center along the corridor; or | | | 6.4 For high-rise buildings, corridor smoke detector activation will close required smoke/fire dampers at the supply inlet to the corridor at the floor receiving the alarm. |

History

• Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 22-13-094, 23-12-103, and 23-20-023, § 51-50-1020, filed 6/14/22, 6/7/23, and 9/25/23, effective 3/15/24
• WSR 20-01-090, § 51-50-1020, filed 12/12/19, effective 7/1/20
• WSR 16-03-064, § 51-50-1020, filed 1/19/16, effective 7/1/16.

Wash. Admin. Code § 51-50-1023 Section 1023—Interior exit stairways and ramps.

1023.12 Smokeproof enclosures. Where required by Section 403.5.4, 405.7.2 or 412.2.2.1, interior exit stairways and ramps shall be smokeproof enclosures in accordance with Section 909.20. Where interior exit stairways and ramps are pressurized in accordance with Section 909.20.5, the smoke control pressurization system shall comply with the requirements specified in Section 909.6.3.

History

• Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 22-13-094, 23-12-103, and 23-20-023, § 51-50-1023, filed 6/14/22, 6/7/23, and 9/25/23, effective 3/15/24
• WSR 20-01-090, § 51-50-1023, filed 12/12/19, effective 7/1/20.

Wash. Admin. Code § 51-50-10240 Reserved.

History

• Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 22-13-094, 23-12-103, and 23-20-023, § 51-50-10240, filed 6/14/22, 6/7/23, and 9/25/23, effective 3/15/24
• WSR 20-21-021, § 51-50-10240, filed 10/9/20, effective 11/9/20
• WSR 20-01-090, § 51-50-10240, filed 12/12/19, effective 7/1/20.

Wash. Admin. Code § 51-50-1028 Reserved.

History

• Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 20-01-090, § 51-50-1028, filed 12/12/19, effective 7/1/20
• WSR 16-03-064, § 51-50-1028, filed 1/19/16, effective 7/1/16.

Wash. Admin. Code § 51-50-10300 Reserved.

History

• Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 22-13-094, 23-12-103, and 23-20-023, § 51-50-10300, filed 6/14/22, 6/7/23, and 9/25/23, effective 3/15/24
• WSR 20-01-090, § 51-50-10300, filed 12/12/19, effective 7/1/20.

Wash. Admin. Code § 51-50-1101 Section 1101—General.

1101.2 Design. Buildings and facilities shall be designed and constructed to be accessible in accordance with this code and ICC A117.1, except those portions of ICC A117.1 amended by this section.

1101.2.1 Reserved.

1101.2.2 (ICC A117.1 Section 404.2.8) Door-opening force. Fire doors and doors or gates required to be equipped with panic hardware, break away features or other factors requiring higher opening force for safety reasons shall have the minimum opening force allowable in scoping provisions adopted by the appropriate administrative authority. For other doors or gates, the force for pushing or pulling open doors or gates shall be as follows:

1. Interior hinged door: 5.0 pounds (22.2 N) maximum

2. Interior sliding or folding doors: 5.0 pounds (22.2 N) maximum

3. Exterior hinged, sliding or folding door: 10 pounds (44.4 N) maximum.

| EXCEPTION: | The force required to retract latch bolts or disengage other devices that hold the door or gate in a closed position shall not apply to panic hardware, delayed egress devices or fire-rated hardware. | | --- | --- |

1101.2.3 Reserved.

1101.2.4 (ICC ANSI A117.1 603.6) Operable parts. Operable parts on drying equipment, towel or cleansing product dispensers, and disposal fixtures shall comply with Table 603.6.

1101.2.5 (ICC A117.1 Section 604.6) Flush controls. Flush controls shall be hand operated or automatic. Hand operated flush controls shall comply with Section 309, except the maximum height above the floor shall be 44 inches. Flush controls shall be located on the open side of the water closet.

| EXCEPTION: | In ambulatory accessible compartments complying with Section 604.10, flush controls shall be permitted to be located on either side of the water closet. | | --- | --- |

1101.2.6 (ICC A117.1 Section 703.6.3.1) International Symbol of Accessibility. Where the International Symbol of Accessibility is required, it shall be proportioned complying with ICC A117.1 Figure 703.6.3.1. All interior and exterior signs depicting the International Symbol of Accessibility shall be white on a blue background.

1101.2.7 (ICC A117.1 Section 502.2) Vehicle space size. Car and van parking spaces shall be 96 inches (2440 mm) minimum in width.

1101.2.8 (ICC A117.1 Section 502.4.2) Access aisle width. Access aisles serving car parking spaces shall be 60 inches (1525 mm) minimum in width. Access aisles serving van parking spaces shall be 96 inches (2440 mm) minimum in width.

1101.2.9 (ICC A117.1 Section 502.7) Identification. Accessible parking spaces shall be indicated by a vertical sign. The signs shall include the International Symbol of Accessibility complying with section 703.6.3.1. Such symbol shall be white on a blue background. Signs identifying van parking spaces shall contain the designation "van accessible." The sign may include additional language such as, but not limited to, an indication of the amount of the monetary penalty defined in RCW 46.19.050 for parking in the space without a valid permit. A vertical "no parking" sign shall be erected at the head of each access aisle located adjacent to an accessible parking space. The sign may include additional language such as, but not limited to, an indication of any penalty for parking in an access aisle. Such signs shall be 60 inches (1525 mm) minimum above the floor of the parking space, measured to the bottom of the sign.

History

• Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 23-23-102, § 51-50-1101, filed 11/15/23, effective 3/16/24
• WSR 22-13-094, 23-12-103, and 23-20-023, § 51-50-1101, filed 6/14/22, 6/7/23, and 9/25/23, effective 3/15/24. Statutory Authority: RCW 19.27.074 and 19.27.550. WSR 17-23-182, § 51-50-1101, filed 11/21/17, effective 7/1/18. Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 16-03-064, § 51-50-1101, filed 1/19/16, effective 7/1/16. Statutory Authority: RCW 19.27.031 and chapters 19.27 and 34.05 RCW. WSR 13-04-067, § 51-50-1101, filed 2/1/13, effective 7/1/13. Statutory Authority: RCW 19.27.074, 19.27.020, and chapters 70.92, 19.27, and 34.05 RCW. WSR 07-01-091, § 51-50-1101, filed 12/19/06, effective 7/1/07. Statutory Authority: RCW 19.27.020, 19.27.031, 19.27.074, and chapters 19.27 and 34.05 RCW. WSR 05-24-070, § 51-50-1101, filed 12/5/05, effective 7/1/06
• WSR 05-01-014, § 51-50-1101, filed 12/2/04, effective 7/1/05. Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 04-01-108, § 51-50-1101, filed 12/17/03, effective 7/1/04.

Wash. Admin. Code § 51-50-11050 Reserved.

History

• Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 22-13-094, 23-12-103, and 23-20-023, § 51-50-11050, filed 6/14/22, 6/7/23, and 9/25/23, effective 3/15/24
• WSR 20-01-090, § 51-50-11050, filed 12/12/19, effective 7/1/20.

Wash. Admin. Code § 51-50-1106 Section 1106—Parking and passenger loading facilities.

1106.7 Location. Accessible parking spaces shall be located on the shortest accessible route of travel from adjacent parking to an accessible building entrance. In parking facilities that do not serve a particular building, accessible parking spaces shall be located on the shortest route to an accessible pedestrian entrance to the parking facility. Where buildings have multiple accessible entrances with adjacent parking, accessible parking spaces shall be dispersed and located near the accessible entrances. Wherever practical, the accessible route shall not cross lanes of vehicular traffic. Where crossing traffic lanes is necessary, the route shall be designated and marked as a crosswalk.

| EXCEPTION: | 1. In multilevel parking structures, van accessible parking spaces are permitted on one level. | | --- | --- | | | 2. Accessible parking spaces shall be permitted to be located in different parking facilities if substantially equivalent or greater accessibility is provided in terms of distance from an accessible entrance or entrances, parking fee and user convenience. |

History

• Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 22-13-094, 23-12-103, and 23-20-023, § 51-50-1106, filed 6/14/22, 6/7/23, and 9/25/23, effective 3/15/24. Statutory Authority: RCW 19.27.031 and chapters 19.27 and 34.05 RCW. WSR 13-04-067, § 51-50-1106, filed 2/1/13, effective 7/1/13. Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 10-03-097, § 51-50-1106, filed 1/20/10, effective 7/1/10. Statutory Authority: RCW 19.27.074, 19.27.020, and chapters 70.92, 19.27, and 34.05 RCW. WSR 07-01-091, § 51-50-1106, filed 12/19/06, effective 7/1/07. Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 04-01-108, § 51-50-1106, filed 12/17/03, effective 7/1/04.

Wash. Admin. Code § 51-50-1107 Section 1107—Motor vehicle related facilities.

1107.2 Electrical vehicle charging stations. Electrical vehicle charging stations shall comply with Sections 1107.2.1 and 1107.2.2.

| EXCEPTION: | Electrical vehicle charging stations provided to serve Group R-3 occupancies are not required to comply with this section. | | --- | --- |

1107.2.1 Number of accessible vehicle spaces. See Section 429.4.

History

• Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 22-13-094, 23-12-103, and 23-20-023, § 51-50-1107, filed 6/14/22, 6/7/23, and 9/25/23, effective 3/15/24
• WSR 21-06-035, § 51-50-1107, filed 2/23/21, effective 3/26/21
• WSR 20-21-021, § 51-50-1107, filed 10/9/20, effective 11/9/20
• WSR 20-01-090, § 51-50-1107, filed 12/12/19, effective 7/1/20
• WSR 16-03-064, § 51-50-1107, filed 1/19/16, effective 7/1/16. Statutory Authority: RCW 19.27.031 and chapters 19.27 and 34.05 RCW. WSR 13-04-067, § 51-50-1107, filed 2/1/13, effective 7/1/13. Statutory Authority: RCW 19.27.074, 19.27.020, and chapters 70.92, 19.27, and 34.05 RCW. WSR 07-01-091, § 51-50-1107, filed 12/19/06, effective 7/1/07. Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 04-01-108, § 51-50-1107, filed 12/17/03, effective 7/1/04.

Wash. Admin. Code § 51-50-1108 Section 1108—Dwelling units and sleeping units.

1108.6.2.2.1 Type A units. In Group R-2 Occupancies containing more than 10 dwelling units or sleeping units, at least 5 percent, but not less than one, of the units shall be a Type A unit. All units on a site shall be considered to determine the total number of units and the required number of Type A units. Type A units shall be dispersed among the various classes of units, as described in Section 1108.6. Bedrooms in monasteries and convents shall be counted as sleeping units for the purpose of determining the number of units. Where the sleeping units are grouped into suites, only one sleeping unit in each suite shall count towards the number of required Type A units.

| EXCEPTIONS: | 1. The number of Type A units is permitted to be reduced in accordance with Section 1108.7. | | --- | --- | | | 2. Existing structures on a site shall not contribute to the total number of units on a site. |

History

• Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 23-23-102, § 51-50-1108, filed 11/15/23, effective 3/16/24
• WSR 22-13-094, 23-12-103, and 23-20-023, § 51-50-1108, filed 6/14/22, 6/7/23, and 9/25/23, effective 3/15/24.

Wash. Admin. Code § 51-50-11090 Reserved.

History

• Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 22-13-094, 23-12-103, and 23-20-023, § 51-50-11090, filed 6/14/22, 6/7/23, and 9/25/23, effective 3/15/24
• WSR 20-21-021, § 51-50-11090, filed 10/9/20, effective 11/9/20
• WSR 20-01-090, § 51-50-11090, filed 12/12/19, effective 7/1/20.

Wash. Admin. Code § 51-50-1110 Section 1110—Other features and facilities.

1110.2 Toilet and bathing facilities. Each toilet room and bathing room shall be accessible. Where a floor level is not required to be connected by an accessible route, the only toilet rooms or bathing rooms provided within the facility shall not be located on the inaccessible floor. Except as provided for in Sections 1110.2.4 and 1110.2.5 at least one of each type of fixture, element, control or dispenser in each accessible toilet room and bathing room shall be accessible.

| EXCEPTIONS: | 1. Toilet rooms or bathing rooms accessed only through a private office, not for common or public use and intended for use by a single occupant, shall be permitted to comply with the specific exceptions in ICC A117.1. | | --- | --- | | | 2. This section is not applicable to toilet and bathing rooms that serve dwelling units or sleeping units that are not required to be accessible by Section 1108. | | | 3. Where multiple single-user all-gender toilet rooms or bathing rooms are clustered at a single location, at least 50 percent shall be accessible. | | | 4. Where no more than one urinal is provided in a toilet room or bathing room, the urinal is not required to be accessible. | | | 5. Toilet rooms or bathing rooms that are part of critical care or intensive care patient sleeping rooms serving accessible units are not required to be accessible. | | | 6. Toilet rooms or bathing rooms designed for bariatrics patients are not required to comply with the toilet room and bathing room requirement in ICC A117.1. The sleeping units served by bariatrics toilet or bathing rooms shall not count toward the required number of accessible sleeping units. | | | 7. Where permitted in Section 1108, in toilet rooms or bathrooms serving accessible units, water closets designed for assisted toileting shall be permitted to comply with Section 1110.2.2. | | | 8. Where permitted in Section 1108, in bathrooms serving accessible units, showers designed for assisted bathing shall be permitted to comply with Section 1110.2.3. | | | 9. Where toilet facilities are primarily for children's use, required accessible water closets, toilet compartments and lavatories shall be permitted to comply with children's provision of ICC A117.1. |

1110.5.1 Minimum number. Not fewer than two drinking fountains shall be provided. One drinking fountain shall comply with the requirements for people who use a wheelchair and one drinking fountain shall comply with the requirements for standing persons.

| EXCEPTIONS: | 1. A single drinking fountain with two separate spouts that complies with the requirements for people who use a wheelchair and standing persons shall be permitted to be substituted for two separate drinking fountains. | | --- | --- | | | 2. Where drinking fountains are primarily for children's use, drinking fountains for people using wheelchairs shall be permitted to comply with the children's provisions in ICC A117.1 and drinking fountains for standing children shall be permitted to provide the spout at 30 inches (762 mm) minimum above the floor. | | | 3. In all occupancies that require more than two drinking fountains per floor or secured area, bottle filling stations shall be allowed to be substituted in accordance with Section 2902.5. |

History

• Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 23-23-102, § 51-50-1110, filed 11/15/23, effective 3/16/24
• WSR 22-13-094, 23-12-103, and 23-20-023, § 51-50-1110, filed 6/14/22, 6/7/23, and 9/25/23, effective 3/15/24.

Wash. Admin. Code § 51-50-1202 Section 1202—Ventilation.

1202.1 General. Buildings shall be provided with natural ventilation in accordance with Section 1202.5, or mechanical ventilation in accordance with the International Mechanical Code. Ambulatory care facilities and Group I-2 occupancies shall be ventilated by mechanical means in accordance with Section 407 of the International Mechanical Code.

1202.2.1 Ventilated attics and rafter spaces. Enclosed attics and enclosed rafter spaces formed where ceilings are applied directly to the underside of roof framing members shall have cross ventilation for each separate space by ventilation openings protected against the entrance of rain and snow. Blocking and bridging shall be arranged so as not to interfere with the movement of air. An airspace of not less than 1 inch (25 mm) shall be provided between the insulation and the roof sheathing. The net free ventilating area shall not be less than 1/150th of the area of the space ventilated. Ventilators shall be installed in accordance with the manufacturer's installation instructions.

| EXCEPTION: | The net free cross-ventilation area shall be permitted to be reduced to 1/300 provided both of the following conditions are met: | | --- | --- | | | 1. A Class I or II vapor retarder is installed on the warm-in-winter side of the ceiling. | | | 2. At least 40 percent and not more than 50 percent of the required venting area is provided by ventilators located in the upper portion of the attic or rafter space. Upper ventilators shall be located not more than 3 feet (914 mm) below the ridge or highest point of the space, measured vertically, with the balance of the ventilation provided by eave or cornice vents. Where the location of wall or roof framing members conflicts with the installation of upper ventilators, installation more than 3 feet (914 mm) below the ridge or highest point of the space shall be permitted. |

1202.4 Under-floor ventilation. The space between the bottom of the floor joists and the earth under any building except spaces occupied by basements or cellars shall be provided with ventilation openings through foundation walls or exterior walls. Such openings shall be placed so as to provide cross ventilation of the under-floor space. A ground cover of six mil (0.006 inch thick) black polyethylene or approved equal shall be laid over the ground within crawl spaces. The ground cover shall be overlapped six inches minimum at the joints and shall extend to the foundation wall.

| EXCEPTION: | The ground cover may be omitted in crawl spaces if the crawl space has a concrete slab floor with a minimum thickness of two inches. | | --- | --- |

1202.5 Natural ventilation. For other than Group R Occupancies, natural ventilation of an occupied space shall be through windows, doors, louvers or other openings to the outdoors. The operating mechanism for such openings shall be provided with ready access so that the openings are readily controllable by the building occupants. Group R Occupancies shall comply with the International Mechanical Code.

1202.7 Radon resistive construction standards. The criteria of this section establishes minimum radon resistive construction requirements for Group R Occupancies.

1202.7.1 Application. The requirements of Section 1202.7 shall be adopted and enforced by all jurisdictions of the state according to the following subsections.

1202.7.1.1 All jurisdictions of the state shall comply with Section 1202.7.2.

1202.7.1.2 Clark, Ferry, Okanogan, Pend Oreille, Skamania, Spokane, and Stevens counties shall also comply with Section 1202.7.3.

1202.7.2 State wide radon requirements.

1202.7.2.1 Crawlspaces. All crawlspaces shall comply with the requirements of this section.

1202.7.2.2 Ventilation. All crawlspaces shall be ventilated as specified in Section 1202.4.

If the installed ventilation in a crawlspace is less than one square foot for each 300 square feet of crawlspace area, or if the crawlspace vents are equipped with operable louvers, a radon vent shall be installed to originate from a point between the ground cover and soil. The radon vent shall be installed in accordance with Sections 1202.7.3.2.6 and 1202.7.3.2.7.

1202.7.2.3 Crawlspace plenum systems. In crawlspace plenum systems used for providing supply air for an HVAC system, aggregate, a permanently sealed soil gas retarder membrane and a radon vent pipe shall be installed in accordance with Section 1202.7.3.2. Crawlspaces shall not be used for return air plenums.

In addition, an operable radon vent fan shall be installed and activated. The fan shall be located as specified in Section 1202.7.3.2.7. The fan shall be capable of providing at least 100 cfm at 1-inch water column static pressure. The fan shall be controlled by a readily accessible manual switch. The switch shall be labeled "RADON VENT FAN."

1202.7.3 Radon prescriptive requirements.

1202.7.3.1 Scope. This section applies to those counties specified in Section 1202.7.1.2. This section establishes prescriptive construction requirements for reducing the potential for radon entry into all Group R Occupancies, and for preparing the building for future mitigation if desired.

In all crawlspaces, except crawlspace plenums used for providing supply air for an HVAC system, a continuous air barrier shall be installed between the crawlspace area and the occupied area to limit air transport between the areas. If a wood sheet subfloor or other material is utilized as an air barrier, in addition to the requirements of Section 502.1.6.2 of the Washington State Energy Code, all joints between sheets shall be sealed.

1202.7.3.2 Floors in contact with the earth.

1202.7.3.2.1 General. Concrete slabs that are in direct contact with the building envelope shall comply with the requirements of this section.

| EXCEPTION: | Concrete slabs located under garages or other than Group R Occupancies need not comply with this chapter. | | --- | --- |

1202.7.3.2.2 Aggregate. A layer of aggregate of 4-inch minimum thickness shall be placed beneath concrete slabs. The aggregate shall be continuous to the extent practical.

1202.7.3.2.3 Gradation. Aggregate shall:

1. Comply with ASTM Standard C-33 Standard Specification for Concrete Aggregate and shall be size No. 8 or larger size aggregate as listed in Table 2, Grading Requirements for Course Aggregate; or

2. Meet the 1988 Washington State Department of Transportation Specification 9-03.1 (3) "Coarse Aggregate for Portland Cement Concrete," or any equivalent successor standards. Aggregate size shall be of Grade 8 or larger as listed in Section 9-03.1 (3) C, "Grading"; or

3. Be screened, washed pea gravel free of deleterious substances in a manner consistent with ASTM Standard C-33 with 100 percent passing a 1/2-inch sieve and less than 5 percent passing a No. 16 sieve. Sieve characteristics shall conform to those acceptable under ASTM Standard C-33.

| EXCEPTION: | Aggregate shall not be required if a substitute material or system, with sufficient load bearing characteristics, and having approved capability to provide equal or superior air flow, is installed. | | --- | --- |

1202.7.3.2.4 Soil-gas retarder membrane. A soil-gas retarder membrane, consisting of at least one layer of virgin polyethylene with a thickness of at least 6 mil, or equivalent flexible sheet material, shall be either placed directly under all concrete slabs so that the slab is in direct contact with the membrane, or on top of the aggregate with 2 inches minimum of fine sand or pea gravel installed between the concrete slab and membrane. The flexible sheet shall extend to the foundation wall or to the outside edge of the monolithic slab. Seams shall overlap at least 12 inches. The membrane shall also be fitted tightly to all pipes, wires, and other penetrations of the membrane and sealed with an approved sealant or tape. All punctures or tears shall be repaired with the same or approved material and similarly lapped and sealed.

1202.7.3.2.5 Sealing of penetrations and joints. All penetrations and joints in concrete slabs or other floor systems and walls below grade shall be sealed by an approved sealant to create an air barrier to limit the movement of soil-gas into the indoor air.

Sealants shall be approved by the manufacturer for the intended purpose. Sealant joints shall conform to manufacturer's specifications. The sealant shall be placed and tooled in accordance with manufacturer's specifications. There shall be no gaps or voids after the sealant has cured.

1202.7.3.2.6 Radon vent. One continuous sealed pipe shall run from a point within the aggregate under each concrete slab to a point outside the building. Joints and connections shall be permanently gas tight. The continuous sealed pipe shall interface with the aggregate in the following manner, or by other approved equal method. The pipe shall be permanently connected to a "T" within the aggregate area so that the two end openings of the "T" lie within the aggregate area. A minimum of 5 feet of perforated drain pipe of 3 inches minimum diameter shall join to and extend from the "T." The perforated pipe shall remain in the aggregate area and shall not be capped at the ends. The "T" and its perforated pipe extensions shall be located at least 5 feet horizontally from the exterior perimeter of the aggregate area.

The continuous sealed pipe shall terminate no less than 12 inches above the eave, and more than 10 horizontal feet from a woodstove or fireplace chimney, or operable window. The continuous sealed pipe shall be labeled "radon vent." The label shall be placed so as to remain visible to an occupant.

The minimum pipe diameter shall be 3 inches unless otherwise approved. Acceptable sealed plastic pipe shall be smooth walled, and may include either PVC schedule 40 or ABS schedule of equivalent wall thickness.

The entire sealed pipe system shall be sloped to drain to the subslab aggregate.

The sealed pipe system may pass through an unconditioned attic before exiting the building; but to the extent practicable, the sealed pipe shall be located inside the thermal envelope of the building in order to enhance passive stack venting.

| EXCEPTION: | A fan for subslab depressurization system includes the following: | | --- | --- | | | 1. Soil-gas retarder membrane as specified in Section 1202.7.3.2.4; | | | 2. Sealing of penetrations and joints as specified in Section 1202.7.3.2.5; | | | 3. A 3-inch continuous sealed radon pipe shall run from a point within the aggregate under each concrete slab to a point outside the building; | | | 4. Joints and connections shall be gas tight, and may be of either PVC schedule 40 or ABS schedule of equivalent in wall thickness; | | | 5. A label of "radon vent" shall be placed on the pipe so as to remain visible to an occupant; | | | 6. Fan circuit and wiring as specified in Section 1202.7.3.2.7 and a fan. |

If the subslab depressurization system is exhausted through the concrete foundation wall or rim joist, the exhaust terminus shall be a minimum of 6 feet from operable windows or outdoor air intake vents and shall be directed away from operable windows and outdoor air intake vents to prevent radon reentrainment.

1202.7.3.2.7 Fan circuit and wiring and location. An area for location of an in-line fan shall be provided. The location shall be as close as practicable to the radon vent pipe's point of exit from the building, or shall be outside the building shell; and shall be located so that the fan and all downstream piping is isolated from the indoor air.

Provisions shall be made to allow future activation of an in-line fan on the radon vent pipe without the need to place new wiring. A 110 volt power supply shall be provided at a junction box near the fan location.

1202.7.3.2.8 Separate aggregate areas. If the 4-inch aggregate area underneath the concrete slab is not continuous, but is separated into distinct isolated aggregate areas by a footing or other barrier, a minimum of one radon vent pipe shall be installed into each separate aggregate area.

| EXCEPTION: | Separate aggregate areas may be considered a single area if a minimum 3-inch diameter connection joining the separate areas is provided for every 30 feet of barrier separating those areas. | | --- | --- |

1202.7.3.2.9 Concrete block walls. Concrete block walls connected to below grade areas shall be considered unsealed surfaces. All openings in concrete block walls that will not remain accessible upon completion of the building shall be sealed at both vertical and horizontal surfaces, in order to create a continuous air barrier to limit the transport of soil-gas into the indoor air.

History

• Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 22-13-094, 23-12-103, and 23-20-023, § 51-50-1202, filed 6/14/22, 6/7/23, and 9/25/23, effective 3/15/24
• WSR 20-21-021, § 51-50-1202, filed 10/9/20, effective 11/9/20
• WSR 20-01-090, § 51-50-1202, filed 12/12/19, effective 7/1/20.

Wash. Admin. Code § 51-50-1203 Section 1203—Temperature control.

1203.1 Equipment and systems. Interior spaces intended for human occupancy shall be provided with active or passive space-heating systems capable of maintaining an indoor temperature of not less than 68°F (20°C) at a point 3 feet (914 mm) above the floor on the design heating day.

| EXCEPTIONS: | 1. Interior spaces where the primary purpose of the space is not associated with human comfort. | | --- | --- | | | 2. Group F, H, S, or U occupancies. | | | 3. Group R-1 Occupancies not more than 500 square feet (46 m2). |

1203.2 Definitions. For the purposes of this section only, the following definitions apply.

DESIGNATED AREAS are those areas designated by a county to be an urban growth area in chapter 36.70A RCW and those areas designated by the U.S. Environmental Protection Agency as being in nonattainment for particulate matter.

SUBSTANTIALLY REMODELED means any alteration or restoration of a building exceeding 60 percent of the appraised value of such building within a 12-month period. For the purpose of this section, the appraised value is the estimated cost to replace the building and structure in-kind, based on current replacement costs.

1203.3 Primary heating source. Primary heating sources in all new and substantially remodeled buildings in designated areas shall not be dependent upon wood stoves.

1203.4 Solid fuel burning devices. No new or used solid fuel burning device shall be installed in new or existing buildings unless such device is United States Environmental Protection Agency certified or exempt from certification by the United States Environmental Protection Agency and conforms with RCW 70A.15.1005, 70A.15.3500, 70A.15.3510, and 70A.15.3530.

| EXCEPTIONS: | 1. Wood cook stoves. | | --- | --- | | | 2. Antique wood heaters manufactured prior to 1940. |

History

• Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 23-23-102, § 51-50-1203, filed 11/15/23, effective 3/16/24
• WSR 20-21-021, § 51-50-1203, filed 10/9/20, effective 11/9/20
• WSR 20-01-090, § 51-50-1203, filed 12/12/19, effective 7/1/20
• WSR 16-03-064, § 51-50-1203, filed 1/19/16, effective 7/1/16. Statutory Authority: RCW 19.27.074, 19.27.020, and 19.27.031. WSR 14-24-055, § 51-50-1203, filed 11/25/14, effective 5/1/15. Statutory Authority: RCW 19.27.031 and chapters 19.27 and 34.05 RCW. WSR 13-04-067, § 51-50-1203, filed 2/1/13, effective 7/1/13. Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 10-03-097, § 51-50-1203, filed 1/20/10, effective 7/1/10
• WSR 04-01-108, § 51-50-1203, filed 12/17/03, effective 7/1/04.

Wash. Admin. Code § 51-50-1204 Reserved.

History

• Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 22-13-094, 23-12-103, and 23-20-023, § 51-50-1204, filed 6/14/22, 6/7/23, and 9/25/23, effective 3/15/24
• WSR 16-03-064, § 51-50-1204, filed 1/19/16, effective 7/1/16. Statutory Authority: RCW 19.27.031 and chapters 19.27 and 34.05 RCW. WSR 13-04-067, § 51-50-1204, filed 2/1/13, effective 7/1/13. Statutory Authority: RCW 19.27.074, 19.27.020, and chapters 70.92, 19.27, and 34.05 RCW. WSR 07-01-091, § 51-50-1204, filed 12/19/06, effective 7/1/07. Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 04-01-108, § 51-50-1204, filed 12/17/03, effective 7/1/04.

Wash. Admin. Code § 51-50-1206 Reserved.

History

• Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 22-13-094, 23-12-103, and 23-20-023, § 51-50-1206, filed 6/14/22, 6/7/23, and 9/25/23, effective 3/15/24
• WSR 20-01-090, § 51-50-1206, filed 12/12/19, effective 7/1/20.

Wash. Admin. Code § 51-50-1207 Reserved.

History

• Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 22-13-094, 23-12-103, and 23-20-023, § 51-50-1207, filed 6/14/22, 6/7/23, and 9/25/23, effective 3/15/24
• WSR 20-01-090, § 51-50-1207, filed 12/12/19, effective 7/1/20.

Wash. Admin. Code § 51-50-1208 Section 1208—Interior space dimensions.

1208.3 Dwelling unit size. Dwelling units shall have a minimum of 190 square feet (17.7 m2) of habitable space.

1208.4 Room area. Every dwelling unit shall have not less than one room that shall have not less than 120 square feet (11.2 m2) of net floor area. Sleeping units and other habitable rooms of a dwelling unit shall have a net floor area of not less than 70 square feet (6.5 m2).

| EXCEPTION: | Kitchens are not required to be of a minimum floor area. | | --- | --- |

1208.5 Efficiency dwelling units. Efficiency dwelling units shall conform to the requirements of the code except as modified herein:

1. The unit's habitable space shall comply with Sections 1208.1 through 1208.4.

2. The unit shall be provided with a separate closet.

3. For other than accessible, Type A and Type B dwelling units, the unit shall be provided with a kitchen sink, cooking appliance and refrigerator, each having a clear working space of not less than 30 inches (762 mm) in front. Light and ventilation conforming to this code shall be provided.

4. The unit shall be provided with a separate bathroom containing a water closet, lavatory, and bathtub or shower.

History

• Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 23-23-102, § 51-50-1208, filed 11/15/23, effective 3/16/24
• WSR 22-13-094, 23-12-103, and 23-20-023, § 51-50-1208, filed 6/14/22, 6/7/23, and 9/25/23, effective 3/15/24
• WSR 20-01-090, § 51-50-1208, filed 12/12/19, effective 7/1/20
• WSR 16-03-064, § 51-50-1208, filed 1/19/16, effective 7/1/16. Statutory Authority: RCW 19.27.031 and chapters 19.27 and 34.05 RCW. WSR 13-04-067, § 51-50-1208, filed 2/1/13, effective 7/1/13. Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 10-03-097, § 51-50-1208, filed 1/20/10, effective 7/1/10. Statutory Authority: RCW 19.27.020, 19.27.031, 19.27.074 and chapters 19.27 and 34.05 RCW. WSR 05-01-014, § 51-50-1208, filed 12/2/04, effective 7/1/05. Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 04-01-108, § 51-50-1208, filed 12/17/03, effective 7/1/04.

Wash. Admin. Code § 51-50-1209 Reserved.

History

• Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 22-13-094, 23-12-103, and 23-20-023, § 51-50-1209, filed 6/14/22, 6/7/23, and 9/25/23, effective 3/15/24
• WSR 20-01-090, § 51-50-1209, filed 12/12/19, effective 7/1/20.

Wash. Admin. Code § 51-50-1210 Section 1210—Toilet and bathroom requirements.

1210.3.1 Water closet compartment. Each water closet utilized by the public or employees shall occupy a separate compartment with walls or partitions and a door enclosing the fixtures to ensure privacy. Gender-neutral toilet room water closet compartments shall be in accordance with Section 2902.2.2.

| EXCEPTIONS: | 1. Water closet compartments shall not be required in a single-occupant toilet room with a lockable door. | | --- | --- | | | 2. Toilet rooms located in child day care facilities and containing two or more water closets shall be permitted to have one water closet without an enclosing compartment. | | | 3. This provision is not applicable to toilet areas located within Group I-3 occupancy housing areas. |

1210.3.2 Urinal partitions. Each urinal utilized by the public or employees shall occupy a separate area with walls or partitions to provide privacy. The walls or partitions shall begin at a height not more than 12 inches (305 mm) from and extend not less than 60 inches (1524 mm) above the finished floor surface. The walls or partitions shall extend from the wall surface at each side of the urinal not less than 18 inches (457 mm) or to a point not less than 6 inches (152 mm) beyond the outermost front lip of the urinal measured from the finished back wall surface, whichever is greater.

| EXCEPTIONS: | 1. Urinal partitions shall not be required in a single occupant or family or assisted-use toilet room with a lockable door. | | --- | --- | | | 2. Toilet rooms located in child day care facilities and containing two or more urinals shall be permitted to have one urinal without partitions. | | | 3. Urinals located in gender-neutral toilet facilities shall be in accordance with Section 2902.2.2. |

History

• Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 22-13-094, 23-12-103, and 23-20-023, § 51-50-1210, filed 6/14/22, 6/7/23, and 9/25/23, effective 3/15/24
• WSR 16-03-064, § 51-50-1210, filed 1/19/16, effective 7/1/16. Statutory Authority: RCW 19.27.031 and chapters 19.27 and 34.05 RCW. WSR 13-04-067, § 51-50-1210, filed 2/1/13, effective 7/1/13. Statutory Authority: RCW 19.27.020, 19.27.031, 19.27.074 and chapters 19.27 and 34.05 RCW. WSR 05-01-014, § 51-50-1210, filed 12/2/04, effective 7/1/05.

Wash. Admin. Code § 51-50-1402 Section 1402—Performance requirements.

1402.2 Weather protection. Exterior walls shall provide the building with a weather-resistant exterior wall envelope. The exterior wall envelope shall include flashing as described in Section 1404.4. The exterior wall envelope shall be designed and constructed in such a manner as to prevent the accumulation of water within the wall assembly by providing a water-resistant barrier behind the exterior veneer, as described in Section 1403.2, and a means for draining water that enters the assembly to the exterior. An air space cavity is not required under the exterior cladding for an exterior wall clad with lapped or panel siding made of plywood, engineered wood, hardboard, or fiber cement. Protection against condensation in the exterior wall assembly shall be provided in accordance with Section 1404.3.

| EXCEPTIONS: | 1. A weather-resistant exterior wall envelope shall not be required over concrete or masonry walls designed in accordance with Chapters 19 and 21, respectively. | | --- | --- | | | 2. Compliance with the requirements for a means of drainage, and the requirements of Sections 1403.2 and 1404.4, shall not be required for an exterior wall envelope that has been demonstrated through testing to resist wind-driven rain, including joints, penetrations and intersections with dissimilar materials, in accordance with ASTM E 331 under the following conditions: | | | 2.1 Exterior wall envelope test assemblies shall include not fewer than one opening, one control joint, one wall/eave interface and one wall sill. All tested openings and penetrations shall be representative of the intended end-use configuration. | | | 2.2 Exterior wall envelope test assemblies shall be not less than 4 feet by 8 feet (1219 mm by 2438 mm) in size. | | | 2.3 Exterior wall envelope assemblies shall be tested at a minimum differential pressure of 6.24 pounds per square foot (psf) (0.297 kN/m2). | | | 2.4 Exterior wall envelope assemblies shall be subjected to a minimum test exposure duration of 2 hours. The exterior wall envelope design shall be considered to resist wind-driven rain where the results of testing indicate that water did not penetrate control joints in the exterior wall envelope, joints at the perimeter of openings or intersections of terminations with dissimilar materials. | | | 3. Exterior insulation and finish systems (EIFS) complying with Section 1407.4.1. |

History

• Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 22-13-094, 23-12-103, and 23-20-023, § 51-50-1402, filed 6/14/22, 6/7/23, and 9/25/23, effective 3/15/24.

Wash. Admin. Code § 51-50-1403 Reserved.

History

• Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 22-13-094, 23-12-103, and 23-20-023, § 51-50-1403, filed 6/14/22, 6/7/23, and 9/25/23, effective 3/15/24
• WSR 21-06-035, § 51-50-1403, filed 2/23/21, effective 3/26/21
• WSR 16-03-064, § 51-50-1403, filed 1/19/16, effective 7/1/16. Statutory Authority: RCW 19.27.031 and chapters 19.27 and 34.05 RCW. WSR 13-04-067, § 51-50-1403, filed 2/1/13, effective 7/1/13. Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 10-03-097, § 51-50-1403, filed 1/20/10, effective 7/1/10. Statutory Authority: RCW 19.27.190, 19.27.020, and chapters 19.27 and 34.05 RCW. WSR 08-01-110, § 51-50-1403, filed 12/18/07, effective 4/1/08.

Wash. Admin. Code § 51-50-1405 Reserved.

History

• Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 22-13-094, 23-12-103, and 23-20-023, § 51-50-1405, filed 6/14/22, 6/7/23, and 9/25/23, effective 3/15/24. Statutory Authority: RCW 19.27.031 and chapters 19.27 and 34.05 RCW. WSR 13-04-067, § 51-50-1405, filed 2/1/13, effective 7/1/13. Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 10-03-097, § 51-50-1405, filed 1/20/10, effective 7/1/10. Statutory Authority: RCW 19.27.074, 19.27.020, and chapters 70.92, 19.27, and 34.05 RCW. WSR 07-01-091, § 51-50-1405, filed 12/19/06, effective 7/1/07. Statutory Authority: RCW 19.27.020, 19.27.031, 19.27.074 and chapters 19.27 and 34.05 RCW. WSR 05-01-014, § 51-50-1405, filed 12/2/04, effective 7/1/05.

Wash. Admin. Code § 51-50-1406 Reserved.

History

• Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 21-06-035, § 51-50-1406, filed 2/23/21, effective 3/26/21
• WSR 19-02-038, § 51-50-1406, filed 12/26/18, effective 7/1/19.

Wash. Admin. Code § 51-50-1602 Reserved.

History

• Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 10-03-097, § 51-50-1602, filed 1/20/10, effective 7/1/10. Statutory Authority: RCW 19.27.074, 19.27.020, and chapters 70.92, 19.27, and 34.05 RCW. WSR 07-01-091, § 51-50-1602, filed 12/19/06, effective 7/1/07.

Wash. Admin. Code § 51-50-1604 Reserved.

History

• Statutory Authority: RCW 19.27.031, 19.27.074, and 19.27.540. WSR 23-02-073, 23-12-103, and 23-20-023, § 51-50-1604, filed 1/4/23, 6/7/23, and 9/25/23, effective 3/15/24. Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 20-01-090, § 51-50-1604, filed 12/12/19, effective 7/1/20
• WSR 19-02-038, § 51-50-1604, filed 12/26/18, effective 7/1/19.

Wash. Admin. Code § 51-50-1607 Reserved.

History

• Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 20-01-090, § 51-50-1607, filed 12/12/19, effective 7/1/20
• WSR 16-03-064, § 51-50-1607, filed 1/19/16, effective 7/1/16
• WSR 10-03-097, § 51-50-1607, filed 1/20/10, effective 7/1/10. Statutory Authority: RCW 19.27.190, 19.27.020, and chapters 19.27 and 34.05 RCW. WSR 08-01-110, § 51-50-1607, filed 12/18/07, effective 4/1/08. Statutory Authority: RCW 19.27.074, 19.27.020, and chapters 70.92, 19.27, and 34.05 RCW. WSR 07-01-091, § 51-50-1607, filed 12/19/06, effective 7/1/07.

Wash. Admin. Code § 51-50-1609 Section 1609—Reserved.

History

• Statutory Authority: RCW 19.27.031 and chapters 19.27 and 34.05 RCW. WSR 13-04-067, § 51-50-1609, filed 2/1/13, effective 7/1/13. Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 10-03-097, § 51-50-1609, filed 1/20/10, effective 7/1/10.

Wash. Admin. Code § 51-50-1613 Section 1613—Earthquake loads.

1613.4 Amendments to ASCE 7. The provisions of Section 1613.4 shall be permitted as an amendment to the relevant provisions of ASCE 7. The text of ASCE 7 shall be amended as indicated in Sections 1613.4.1 through 1613.4.6.

1613.4.1 ASCE 7 Section 12.2.5.4. Amend ASCE 7 Section 12.2.5.4 as follows:

12.2.5.4 Increased structural height limit for steel eccentrically braced frames, steel special concentrically braced frames, steel buckling-restrained braced frames, steel special plate shear walls, and special reinforced concrete shear walls. The limits on height, hn, in Table 12.2-1 are permitted to be increased from 160 ft (50 m) to 240 ft (75 m) for structures assigned to Seismic Design Categories D or E and from 100 ft (30 m) to 160 ft (50 m) for structures assigned to Seismic Design Category F, provided that the seismic force-resisting systems are limited to steel eccentrically braced frames, steel special concentrically braced frames, steel buckling-restrained braced frames, steel special plate shear walls, or special reinforced concrete cast-in-place shear walls and all of the following requirements are met:

1. The structure shall not have an extreme torsional irregularity as defined in Table 12.3-1 (horizontal structural irregularity Type 1b).

2. The steel eccentrically braced frames, steel special concentrically braced frames, steel buckling-restrained braced frames, steel special plate shear walls or special reinforced concrete shear walls in any one plane shall resist no more than 60 percent of the total seismic forces in each direction, neglecting accidental torsional effects.

3. Where floor and roof diaphragms transfer forces from the vertical seismic force-resisting elements above the diaphragm to other vertical force-resisting elements below the diaphragm, these in-plane transfer forces shall be amplified by the overstrength factor, Ωo for the design of the diaphragm flexure, shear, and collectors.

4. The earthquake force demands in foundation mat slabs, grade beams, and pile caps supporting braced frames and/or walls arranged to form a shear-resisting core shall be amplified by 2 for shear and 1.5 for flexure. The redundancy factor, ρ, applies and shall be the same as that used for the structure in accordance with Section 12.3.4.

1613.4.2 ASCE 7 Section 12.6. Amend ASCE 7 Section 12.6 and Table 12.6-1 to read as follows:

12.6 ANALYSIS PROCEDURE SELECTION

12.6.1 Analysis procedure. The structural analysis required by Chapter 12 shall consist of one of the types permitted in Table 12.6-1, based on the structure's seismic design category, structural system, dynamic properties, and regularity, or with the approval of the authority having jurisdiction, an alternative generally accepted procedure is permitted to be used. The analysis procedure selected shall be completed in accordance with the requirements of the corresponding section referenced in Table 12.6-1.

Table 12.6-1

Permitted Analytical Procedures

| Seismic Design Category | Structural Characteristics | Equivalent Lateral Force Procedure, Section 12.8a | Modal Response Spectrum Analysis, Section 12.9.1, or Linear Response History Analysis, Section 12.9.2 | Nonlinear Response History Procedures, Chapter 16a | | --- | --- | --- | --- | --- | | B, C | All structures | P | P | P | | D, E, F | Risk Category I or II buildings not exceeding two stories above the base | P | P | P | | | Structures of light frame construction | P | P | P | | | Structures with no structural irregularities and not exceeding 160 ft in structural height | P | P | P | | | Structures exceeding 160 ft in structural height with no structural irregularities and with T <3.5Ts | P | P | P | | | Structures not exceeding 160 ft in structural height and having only horizontal irregularities of Type 2, 3, 4, or 5 in Table 12.3-1 or vertical irregularities of Type 4, 5a, or 5b in Table 12.3-2 | P | P | P | | | All other structures ≤ 240 ft in height | NP | P | P | | | All structures ˃ 240 ft in height | NP | NP | Pc |

| a | P: Permitted; NP: Not Permitted; Ts= SD1/SDS. | | --- | --- |

1613.4.3 ASCE 7 Section 11.2. Amend ASCE 7 Section 11.2 to include the following definition:

USGS SEISMIC DESIGN GEODATABASE: A U.S. Geological Survey (USGS) database of geocoded values of seismic design parameters and geocoded sets of multiperiod 5%-damped risk-targeted maximum considered earthquake (MCER) response spectra. The parameters obtained from this database may only be used where referenced by Section 11.4.8.1.

User Note: The USGS Seismic Design Geodatabase is intended to be accessed through a USGS Seismic Design web service that allows the user to specify the site location, by latitude and longitude, and the site class to obtain the seismic design data. The USGS web service spatially interpolates between the gridded data of the USGS geodatabase. Both the USGS geodatabase and the USGS web service can be accessed at https://doi.org/10.5066/F7NK3C76. The USGS Seismic Design Geodatabase is available at the ASCE 7 Hazard Tool https://asce7hazardtool.online/ or an approved equivalent.

1613.4.4 ASCE 7 Section 11.4.8. Amend ASCE 7 Section 11.4.8 to include the following section:

11.4.8.1 Multiperiod design response spectrum. As an alternative to the ground motion hazard analysis requirements of Section 11.4.8, and suitable for all structures other than those designated Site Class F (unless exempted in accordance with Section 20.3.1), a multiperiod design response spectrum may be developed as follows:

1. For exclusive use with the USGS Seismic Design Geodatabase in accordance with this section, the site class shall be determined per Section 20.6.

2. Where a multiperiod design response spectrum is developed in accordance with this section, the parameters SM, SM1, SD, SD1, and TL as obtained by the USGS Seismic Design Geodatabase shall be used for all applications of these parameters in this standard.

3. The SS and S1 parameters obtained by the USGS Seismic Design Geodatabase are only permitted to be used in development of the multiperiod design response spectrum and are not permitted to be used in other applications in this standard. The mapped parameters SS and S1 as determined by Section 11.4.2 and peak ground acceleration parameter PGAM as determined by Section 11.8.3 shall be used for all other applications in this standard.

4. At discrete values of period, T, equal to 0.0s, 0.01s, 0.02s, 0.03s, 0.05s, 0.075s, 0.1s, 0.15s, 0.2s, 0.25s, 0.3s, 0.4s, 0.5s, 0.75s, 1.0s, 1.5s, 2.0s, 3.0s, 4.0s, 5.0s, 7.5s, and 10.0s, the 5%-damped design spectral response acceleration parameter, Sa, shall be taken as 2/3 of the multiperiod 5%-damped MCER response spectrum from the USGS Seismic Design Geodatabase for the applicable site class.

5. At each response period, T, less than 10.0s and not equal to one of the discrete values of period, T, listed in Item 4 above, Sa, shall be determined by linear interpolation between values of Sa, of Item 4 above.

6. At each response period, T, greater than 10.0s, Sa shall be taken as the value of Sa at the period of 10.0s, factored by 10/T, where the value of T is less than or equal to that of the long-period transition period, TL, and shall be taken as the value of Sa at the period of 10.0s factored by 10TL/T2, where the value of T is greater than that of the long-period transition period, TL.

7. Where an MCER response spectrum is required, it shall be determined by multiplying the multiperiod design response spectrum by 1.5.

8. For use with the equivalent lateral force procedure, the spectral acceleration Sa at T shall be permitted to replace SD1/T in Equation (12.8-3) and SD1TL/T2 in Equation (12.8-4).

1613.4.5 ASCE 7 Section 20.6. Amend ASCE 7 Chapter 20 to include the following section:

Section 20.6 Site classification procedure for use with Section 11.4.8.1. For exclusive use in determining the multiperiod design response spectrum and associated spectral parameters in accordance with Section 11.4.8.1, the site class shall be determined in accordance with this section. For all other applications in this standard the site class shall be determined per Section 20.1.

20.6.1 Site classification. The site soil shall be classified in accordance with Table 20.6-1 and Section 20.6.2 based on the average shear wave velocity parameter, , which is derived from the measured shear wave velocity profile from the ground surface to a depth of 100 ft (30 m). Where shear wave velocity is not measured, appropriate generalized correlations between shear wave velocity and standard penetration test (SPT) blow counts, cone penetration test (CPT) tip resistance, shear strength, or other geotechnical parameters shall be used to obtain an estimated shear wave velocity profile, as described in Section 20.6.3. Where site-specific data (measured shear wave velocities or other geotechnical data that can be used to estimate shear wave velocity) are available only to a maximum depth less than 100 ft (30 m), shall be estimated as described in Section 20.6.3.

Where the soil properties are not known in sufficient detail to determine the site class, the most critical site conditions of Site Class C, Site Class CD and Site Class D, as defined in Section 20.6.2, shall be used unless the authority having jurisdiction or geotechnical data determine that Site Class DE, E or F soils are present at the site. Site Classes A and B shall not be assigned to a site if there is more than 10 ft (3.1 m) of soil between the rock surface and the bottom of the spread footing or mat foundation.

20.6.2 Site class definitions. Site class types shall be assigned in accordance with the definitions provided in Table 20.6.2-1 and this section.

20.6.2.1 Soft clay Site Class E. Where a site does not qualify under the criteria for Site Class F per Section 20.3.1 and there is a total thickness of soft clay greater than 10 ft (3 m), where a soft clay layer is defined by su<500 psf (su<25 kPa), w ≥ 40%, and PI ˃ 20, it shall be classified as Site Class E. This classification is made regardless of , as computed in Section 20.4.

20.6.2.2 Site Classes C, CD, D, DE and E. The assignment of Site Class C, CD, D, DE and E soils shall be made based on the average shear wave velocity, which is derived from the site shear wave velocity profile from the ground surface to a depth of 100 ft (30 m), as described in Section 20.4.

20.6.2.3 Site Classes B and BC (medium hard and soft rock). Site Class B can only be assigned to a site on the basis of shear wave velocity measured on site. If shear wave velocity data are not available and the site condition is estimated by a geotechnical engineer, engineering geologist, or seismologist as Site Class B or BC on the basis of site geology, consisting of competent rock with moderate fracturing and weathering, the site shall be classified as Site Class BC. Softer and more highly fractured and weathered rock shall either be measured on site for shear wave velocity or classified as Site Class C.

20.6.2.4 Site Class A (hard rock). The hard rock, Site Class A, category shall be supported by shear wave velocity measurement, either on site or on profiles of the same rock type in the same formation with an equal or greater degree of weathering and fracturing. Where hard rock conditions are known to be continuous to a depth of 100 ft (30 m), surficial shear wave velocity measurements to maximum depths less than 100 ft are permitted to be extrapolated to assess .

Table 20.6.2-1 Site Classification

| | Site Class | Calculated Using Measured or Estimated Shear Wave Velocity Profile (ft/s) | | | --- | --- | --- | --- | | | A. Hard Rock | ˃ 5,000 | | | | B. Medium Hard Rock | ˃ 3,000 to 5,000 | | | | BC. Soft Rock | ˃ 2,100 to 3,000 | | | | C. Very Dense Sand or Hard Clay | ˃ 1,450 to 2,100 | | | | CD. Dense Sand or Very Stiff Clay | ˃ 1,000 to 1,450 | | | | D. Medium Dense Sand or Stiff Clay | ˃ 700 to 1,000 | | | | DE. Loose Sand or Medium Stiff Clay | ˃ 500 to 700 | | | | E. Very Loose Sand or Soft Clay | ≤ 500 | |

20.6.3 Estimation of shear wave velocity profiles. Where measured shear wave velocity data are not available, shear wave velocity shall be estimated as a function of depth using correlations with suitable geotechnical parameters, including standard penetration test (SPT) blow counts, shear strength, overburden pressure, void ratio, or cone penetration test (CPT) tip resistance, measured at the site.

Site class based on estimated values of shall be derived using , /1.3, and 1.3 when correlation models are used to derive shear wave velocities. Where correlations derived for specific local regions can be demonstrated to have greater accuracy, factors less than 1.3 can be used if approved by the authority having jurisdiction. If the different average velocities result in different site classes per Table 20.6.2-1, the most critical of the site classes for ground motion analysis at each period shall be used.

Where the available data used to establish the shear wave velocity profile extends to depths less than 100 ft (30 m) but more than 50 ft (15 m), and the site geology is such that soft layers are unlikely to be encountered between 50 and 100 ft, the shear wave velocity of the last layer in the profile shall be extended to 100 ft for the calculation of in Equation (20.4-1). Where the data does not extend to depths of 50 ft (15 m), default site classes, as described in Section 20.6.1, shall be used unless another site class can be justified on the basis of the site geology.

1613.4.6 ASCE 7 Section 21.3.1. Amend ASCE 7 Section 21.3 to include the following section:

Section 21.3.1 Alternate minimum design spectral response accelerations. As an alternate approach to Section 21.3, the lower limit of Sa is permitted to be determined according to this section. The design spectral response acceleration at any period shall not be taken less than 80% of the multiperiod design response spectrum as determined by Section 11.4.8.1.

For sites classified as Site Class F requiring site-specific analysis in accordance with Section 11.4.8, the design spectral response acceleration at any period shall not be less than 80% of Sa determined for Site Class E.

| EXCEPTION: | Where a different site class can be justified using the site-specific classification procedures in accordance with Section 20.6.2.2, a lower limit of 80% of Sa for the justified site class shall be permitted to be used. | | --- | --- |

History

• Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 23-23-102, § 51-50-1613, filed 11/15/23, effective 3/16/24. Statutory Authority: RCW 19.27.031, 19.27.074, and 19.27.540. WSR 23-02-073, 23-12-103, and 23-20-023, § 51-50-1613, filed 1/4/23, 6/7/23, and 9/25/23, effective 3/15/24. Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 20-21-021, § 51-50-1613, filed 10/9/20, effective 11/9/20
• WSR 20-01-090, § 51-50-1613, filed 12/12/19, effective 7/1/20
• WSR 19-02-038, § 51-50-1613, filed 12/26/18, effective 7/1/19
• WSR 10-03-097, § 51-50-1613, filed 1/20/10, effective 7/1/10. Statutory Authority: RCW 19.27.190, 19.27.020, and chapters 19.27 and 34.05 RCW. WSR 08-01-110, § 51-50-1613, filed 12/18/07, effective 4/1/08.

Wash. Admin. Code § 51-50-1615 Tsunami loads.

1615.1 General. The design and construction of Risk Category III and IV buildings and structures located in the Tsunami Design Zones shall be in accordance with Chapter 6 of ASCE 7-22, except as modified by this code. Wherever ASCE 7 is referenced herein, it shall refer to ASCE 7-22, within the extent of ASCE 7 Chapter 6 and WAC 51-50-1615.

| USER NOTE: | The intent of the Washington state amendments to ASCE 7 Chapter 6 (Tsunami Loads and Effects) is to require use of the Washington Tsunami Design Zone maps to determine inundation limits, i.e., when a site is within a tsunami design zone. The Washington state department of natural resources has parameters for tsunami inundation depth and flow velocity available for all of Washington's coastal waters and tidally influenced riverine systems (WA-TDZ). These parameters are required to be used in lieu of ASCE Tsunami Design Geodatabase, and as a basis for comparison in the probabilistic tsunami hazard analysis in this chapter. | | --- | --- |

1615.2 Modifications to ASCE 7. The text of Chapter 6 of ASCE 7 shall be modified as indicated in this section.

1615.2.1 ASCE 7 Section 6.1.1. Replace the third paragraph of ASCE 7 Section 6.1.1 with the following and remove the associated exception:

The Tsunami Design Zone shall be determined using the Washington Tsunami Design Zone maps (WA-TDZ). The WA-TDZ maps are available at https://www.dnr.wa.gov/wa-tdz.

1615.2.2 ASCE 7 Section 6.1.1. Add new fifth paragraph and user note to ASCE 7 Section 6.1.1 to read as follows:

Whenever a Tsunami Design Zone or Fig. 6.1-1 is referenced in ASCE 7 Chapter 6, the WA-TDZ maps shall be used.

| USER NOTE: | Tsunami design zone and design parameters may be obtained from the Washington state department of natural resources. See https://www.dnr.wa.gov/wa-tdz. | | --- | --- |

1615.2.3 ASCE 7 Section 6.2. Modify ASCE 7 Section 6.2 definitions to read as follows:

ASCE TSUNAMI DESIGN GEODATABASE: Not Adopted.

| USER NOTE: | The ASCE tsunami design geodatabase is not adopted for design purposes in Washington state. | | --- | --- |

MAXIMUM CONSIDERED TSUNAMI: A probabilistic tsunami having a two percent probability of being exceeded in a 50-year period or a 2,475-year mean recurrence, or a deterministic assessment considering the maximum tsunami that can reasonably be expected to affect a site.

TSUNAMI DESIGN ZONE MAP: The Washington Tsunami Design Zone maps (WA-TDZ) designating the potential horizontal inundation limit of the Maximum Considered Tsunami found at www.dnr.wa.gov/wa-tdz.

1615.2.4 ASCE 7 Section 6.2. Add new definitions to ASCE 7 Section 6.2 to read as follows:

WASHINGTON TSUNAMI DESIGN ZONE MAP (WA-TDZ): The Washington department of natural resources maps of potential tsunami inundation limits for the Maximum Considered Tsunami, designated as follows:

| Columbia River | DOGAMI SP-51 (L1 scenario) adopted by WA DNR | | --- | --- | | Outer Coast and Strait area | MS 2022-01 | | Port Townsend | MS 2018-03 (partially superseded by MS 2022-01) | | Puget Sound | MS 2021-01 (revised 2022) | | San Juan Islands | MS 2016-01 (partially superseded on its eastern edge by MS 2021-01) | | Southern Washington Coast | MS 2018-01 |

The Washington state department of natural resources geodatabase of design parameters for tsunami inundation depth, flow velocity, offshore tsunami amplitude, predominant period, and tsunami design zone maps for a maximum considered tsunami is available at the Washington TDZ website (https://www.dnr.wa.gov/wa-tdz).

1615.2.5 ASCE 7 Section 6.5.1. Add new second paragraph to ASCE 7 Section 6.5.1 to read as follows:

6.5.1 Tsunami Risk Category II and III buildings and other structures. The Maximum Considered Tsunami inundation depth and tsunami flow velocity characteristics at a Tsunami Risk Category II or III building or other structure shall be determined by the WA-TDZ maps. Those parameters shall be used as the Maximum Considered Tsunami inundation depth and tsunami flow velocity characteristics in lieu of the Energy Grade Line Analysis in Section 6.6.

1615.2.6 ASCE 7 Section 6.5.1.1. Modify the first paragraph of ASCE 7 Section 6.5.1.1 to read as follows:

6.5.1.1 Runup evaluation for areas where no map values are given. For Tsunami Risk Category II and III buildings and other structures where no mapped inundation limit is shown in the Tsunami Design Zone map, the ratio of tsunami runup elevation above Mean High Water Level to Offshore Tsunami Amplitude, R/HT, shall be permitted to be determined using the surf similarity parameter ξ100, according to Eqs. (6.5-2a, b, c, d, or e) and Fig. 6.5-1.

1615.2.7 ASCE 7 Section 6.5.2. Modify the paragraph and the exception, to read as follows:

6.5.2 Tsunami Risk Category IV buildings and other structures. A site-specific Probabilistic Tsunami Hazard Analysis (PTHA) shall be performed for Tsunami Risk Category IV buildings and other structures. Site-specific velocities determined by site-specific PTHA determined to be less than the design flow velocities determined from the WA-TDZ maps shall be subject to the limitation in Section 6.7.6.8. Site-specific velocities determined to be greater than the WA-TDZ map velocities shall be used.

| EXCEPTION: | For structures other than Tsunami Vertical Evacuation Refuge Structures, a site-specific Probabilistic Tsunami Hazard Analysis need not be performed where the inundation depth determined from the WA-TDZ maps is determined to be less than 12 ft (3.66 m) at any point within the location of the Tsunami Risk Category IV structure. | | --- | --- |

1615.2.8 ASCE 7 Section 6.6.1. Replace ASCE 7 Section 6.6.1 to read as follows:

6.6.1 Maximum inundation depth and flow velocities. The maximum inundation depths and flow velocities associated with the stages of tsunami flooding are determined by the WA-TDZ maps. Flow velocity for design purposes shall not be taken as less than 10 ft/s (3.0 m/s) and need not be taken as greater than the lesser of 1.5(ghmax)1/2 and 50 ft/s (15.2 m/s).

1615.2.9 ASCE 7 Section 6.7. Replace ASCE 7 Section 6.7 with the following and add a user note:

When required by Section 6.5, the inundation depths and flow velocities shall be determined by site-specific inundation studies complying with the requirements of this section. Site-specific analyses shall use an integrated generation, propagation, and inundation model that replicates the given offshore tsunami waveform amplitude and period from the seismic sources given in Section 6.7.2.

| USER NOTE: | WA-TDZ maps are based on an integrated generation, propagation, and inundation model replicating waveforms from the seismic sources specific to Washington state. See https://www.dnr.wa.gov/wa-tdz. | | --- | --- |

1615.2.10 ASCE 7 Table 6.7-2. Modify ASCE 7 Table 6.7-2 to read as follows:

Table 6.7-2 Maximum Moment Magnitude

| Subduction Zone | Moment Magnitude MWmax | | --- | --- | | Alaskan-Aleutian | 9.2 | | Cascadia | 9.0 | | Chile-Peru | 9.5 | | Izu-Bonin-Mariana | 9.0 | | Kamchatka-Kurile and Japan Trench | 9.4 |

1615.2.11 ASCE 7 Section 6.7.5.1. Modify ASCE 7 Section 6.7.5.1 Item 4, Item 5, and Item 6 to read as follows:

6.7.5.1 Offshore tsunami amplitude for distant seismic sources. Offshore tsunami amplitude shall be probabilistically determined in accordance with the following:

4. The extent of offshore tsunami amplitude points considered for the site shall include the following:

(a) For outer coast sites, the extent shall include points within at least 40 mi (64.4 km) but not exceeding 50 mi (80.5 km) of projected length along the coastline, centered on the site within a tolerance of plus or minus 6 mi (9.7 km);

(b) Reserved;

(c) For sites within bays or inland waterways (such as the Strait of Juan de Fuca), the designated center of the computed offshore tsunami amplitude points shall be taken offshore of the mouth of the bay or waterway centered in accordance with criteria (a) above;

(d) For island locations where the projected width of the island is less than 40 mi (64.4 km), it shall be permitted to consider the extent of offshore tsunami amplitude points corresponding to the projected width of the island. Shorter extents of offshore tsunami amplitude points shall be permitted for island locations, but shall not be less than 10 mi (16.1 km);

(e) In addition to the above, the tsunami source development and inundation modeling are subject to an independent peer review by a tsunami modeler approved by the Authority Having Jurisdiction, who shall present a written report to the Authority Having Jurisdiction as to the hazard consistency of the modeling with the requirements of Section 6.7.

5. The mean value of the computed offshore tsunami wave amplitudes shall be not less than 100 percent of the mean value for the coinciding offshore tsunami amplitude data given by the WA-TDZ maps.

6. The individual values of the computed offshore tsunami wave amplitude shall be not less than 80 percent of the coinciding offshore tsunami amplitude values given by the WA-TDZ maps.

1615.2.12 ASCE 7 Section 6.7.5.3. Modify ASCE 7 Section 6.7.5.3.1(b) and (c) to read as follows:

(b) The mean value of the computed offshore tsunami amplitudes is at least 85 percent of the mean value for the coinciding offshore tsunami amplitude data of the WA-TDZ maps.

(c) The values of the computed offshore tsunami wave amplitude are not less than 75 percent of the coinciding offshore tsunami amplitude values of the WA-TDZ maps.

1615.2.13 ASCE 7 Section 6.7.6.2. Modify ASCE 7 Section 6.7.6.2 and add a user note to read as follows:

6.7.6.2 Seismic subsidence before tsunami arrival. Where the seismic source is a local earthquake event, the Maximum Considered Tsunami inundation shall be determined for an overall elevation subsidence value directly computed for the seismic source mechanism.

| USER NOTE: | WA-TDZ maps include computed subsidence and uplift (where applicable) in the inundation results. See https://www.dnr.wa.gov/wa-tdz. | | --- | --- |

1615.2.14 ASCE 7 Figure 6.7-3. Remove Figure 6.7-3 and the associated note.

1615.2.15 ASCE 7 Section 6.8.9. Modify the first sentence of ASCE 7 Section 6.8.9 to read as follows:

6.8.9 Seismic effects on the foundations preceding maximum considered tsunami. Where designated in the Tsunami Design Zone map as a site subject to a tsunami from a local earthquake, the structure shall be designed for the preceding coseismic effects.

History

• Statutory Authority: RCW 19.27.031, 19.27.074, and 19.27.540. WSR 23-02-073, 23-12-103, and 23-20-023, § 51-50-1615, filed 1/4/23, 6/7/23, and 9/25/23, effective 3/15/24. Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 21-12-075, § 51-50-1615, filed 5/28/21, effective 6/28/21.

Wash. Admin. Code § 51-50-1702 Reserved.

History

• Statutory Authority: RCW 19.27.031, 19.27.074, and 19.27.540. WSR 23-02-073, 23-12-103, and 23-20-023, § 51-50-1702, filed 1/4/23, 6/7/23, and 9/25/23, effective 3/15/24. Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 16-03-064, § 51-50-1702, filed 1/19/16, effective 7/1/16. Statutory Authority: RCW 19.27.031 and chapters 19.27 and 34.05 RCW. WSR 13-04-067, § 51-50-1702, filed 2/1/13, effective 7/1/13. Statutory Authority: RCW 19.27.074, 19.27.020, and chapters 70.92, 19.27, and 34.05 RCW. WSR 07-01-091, § 51-50-1702, filed 12/19/06, effective 7/1/07. Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 04-01-108, § 51-50-1702, filed 12/17/03, effective 7/1/04.

Wash. Admin. Code § 51-50-1705 Section 1705—Required special inspections and tests.

1705.13.6 Plumbing, mechanical and electrical components. Periodic special inspection of plumbing, mechanical and electrical components shall be required for the following:

1. Anchorage of electrical equipment for emergency and standby power systems in structures assigned to Seismic Design Category C, D, E or F.

2. Anchorage of other electrical equipment in structures assigned to Seismic Design Category E or F.

3. Installation and anchorage of piping systems designed to carry hazardous materials and their associated mechanical units in structures assigned to Seismic Design Category C, D, E or F.

4. Installation and anchorage of ductwork designed to carry hazardous materials in structures assigned to Seismic Design Category C, D, E or F.

5. Installation and anchorage of vibration isolation systems in structures assigned to Seismic Design Category C, D, E or F where the approved construction documents require a nominal clearance of .25 inch (6.4 mm) or less between the equipment support frame and restraint.

6. Installation of mechanical and electrical equipment, including ductwork, piping systems and their structural supports, where automatic fire sprinkler systems are installed in Risk Category IV structures assigned to Seismic Design Category C, D, E or F to verify one of the following:

6.1. Minimum clearances have been provided as required by Section 13.2.3 ASCE/SEI 7.

6.2. A nominal clearance of not less than 3 inches (76 mm) has been provided between automatic sprinkler system drops and sprigs and: Structural members not used collectively or independently to support the sprinklers; equipment attached to the building structure; and other systems' piping.

Where flexible sprinkler hose fittings are used, special inspection of minimum clearances is not required.

History

• Statutory Authority: RCW 19.27.031, 19.27.074, and 19.27.540. WSR 23-02-073, 23-12-103, and 23-20-023, § 51-50-1705, filed 1/4/23, 6/7/23, and 9/25/23, effective 3/15/24. Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 20-01-090, § 51-50-1705, filed 12/12/19, effective 7/1/20
• WSR 19-02-038, § 51-50-1705, filed 12/26/18, effective 7/1/19
• WSR 16-03-064, § 51-50-1705, filed 1/19/16, effective 7/1/16. Statutory Authority: RCW 19.27.031 and chapters 19.27 and 34.05 RCW. WSR 13-04-067, § 51-50-1705, filed 2/1/13, effective 7/1/13.

Wash. Admin. Code § 51-50-17090 Preconstruction load tests.

1709.5 Exterior window and door assemblies. The design pressure rating of exterior windows and doors in buildings shall be determined in accordance with Section 1709.5.1 or 1709.5.2. For exterior windows and doors tested in accordance with Section 1709.5.1 or 1709.5.2, required design wind pressures determined from ASCE 7 shall be permitted to be converted to allowable stress design by multiplying by 0.6.

| EXCEPTIONS: | 1. Structural wind load design pressures for window or door assemblies other than the size tested in accordance with Section 1709.5.1 or 1709.5.2 shall be permitted to be different than the design value of the tested assembly, provided that such pressures are determined by accepted engineering analysis or validated by an additional test of the window or door assembly to the alternative allowable design pressure in accordance with Section 1709.5.2. Components of the alternate size assembly shall be the same as the tested or labeled assembly. Where engineering analysis is used, it shall be performed in accordance with the analysis procedures of AAMA 2502. | | --- | --- | | | 2. Custom exterior windows and doors manufactured by a small business shall be exempt from all testing requirements in Section 1709 of the International Building Code provided they meet the applicable provisions of Chapter 24 of the International Building Code. |

History

• Statutory Authority: RCW 19.27.031, 19.27.074, and 19.27.540. WSR 23-02-073, 23-12-103, and 23-20-023, § 51-50-17090, filed 1/4/23, 6/7/23, and 9/25/23, effective 3/15/24. Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 16-03-064, § 51-50-17090, filed 1/19/16, effective 7/1/16.

Wash. Admin. Code § 51-50-1710 Reserved.

History

• Statutory Authority: RCW 19.27.031, 19.27.074, and 19.27.540. WSR 23-02-073, 23-12-103, and 23-20-023, § 51-50-1710, filed 1/4/23, 6/7/23, and 9/25/23, effective 3/15/24. Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 16-03-064, § 51-50-1710, filed 1/19/16, effective 7/1/16. Statutory Authority: RCW 19.27.031 and chapters 19.27 and 34.05 RCW. WSR 13-04-067, § 51-50-1710, filed 2/1/13, effective 7/1/13.

Wash. Admin. Code § 51-50-1715 Reserved.

History

• Statutory Authority: RCW 19.27.031, 19.27.074, and 19.27.540. WSR 23-02-073, 23-12-103, and 23-20-023, § 51-50-1715, filed 1/4/23, 6/7/23, and 9/25/23, effective 3/15/24. Statutory Authority: RCW 19.27.031 and chapters 19.27 and 34.05 RCW. WSR 13-04-067, § 51-50-1715, filed 2/1/13, effective 7/1/13. Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 10-03-097, amended and recodified as § 51-50-1715, filed 1/20/10, effective 7/1/10. Statutory Authority: RCW 19.27.074, 19.27.020, and chapters 70.92, 19.27, and 34.05 RCW. WSR 07-01-091, § 51-50-1714, filed 12/19/06, effective 7/1/07.

Wash. Admin. Code § 51-50-1807 Section 1807—Foundation walls, retaining walls and embedded posts and poles.

1807.2.2 Design lateral soil loads. Retaining walls shall be designed for the lateral soil loads set forth in Section 1610. For structures assigned to Seismic Design Category D, E, or F, the design of retaining walls supporting more than 6 feet (1829 mm) of backfill height measured to the bottom of the footing shall incorporate the additional seismic lateral earth pressure in accordance with the geotechnical investigation where required in Section 1803.2.

History

• Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 20-01-090, § 51-50-1807, filed 12/12/19, effective 7/1/20.

Wash. Admin. Code § 51-50-1901 Reserved.

History

• Statutory Authority: RCW 19.27.031, 19.27.074, and 19.27.540. WSR 23-02-073, 23-12-103, and 23-20-023, § 51-50-1901, filed 1/4/23, 6/7/23, and 9/25/23, effective 3/15/24. Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 16-03-064, § 51-50-1901, filed 1/19/16, effective 7/1/16. Statutory Authority: RCW 19.27.031 and chapters 19.27 and 34.05 RCW. WSR 13-04-067, § 51-50-1901, filed 2/1/13, effective 7/1/13.

Wash. Admin. Code § 51-50-1903 Reserved.

History

• Statutory Authority: RCW 19.27.031, 19.27.074, and 19.27.540. WSR 23-02-073, 23-12-103, and 23-20-023, § 51-50-1903, filed 1/4/23, 6/7/23, and 9/25/23, effective 3/15/24. Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 16-03-064, § 51-50-1903, filed 1/19/16, effective 7/1/16. Statutory Authority: RCW 19.27.031 and chapters 19.27 and 34.05 RCW. WSR 13-04-067, § 51-50-1903, filed 2/1/13, effective 7/1/13.

Wash. Admin. Code § 51-50-1904 Reserved.

History

• Statutory Authority: RCW 19.27.031, 19.27.074, and 19.27.540. WSR 23-02-073, 23-12-103, and 23-20-023, § 51-50-1904, filed 1/4/23, 6/7/23, and 9/25/23, effective 3/15/24. Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 16-03-064, § 51-50-1904, filed 1/19/16, effective 7/1/16. Statutory Authority: RCW 19.27.031 and chapters 19.27 and 34.05 RCW. WSR 13-04-067, § 51-50-1904, filed 2/1/13, effective 7/1/13.

Wash. Admin. Code § 51-50-1905 Reserved.

History

• Statutory Authority: RCW 19.27.031, 19.27.074, and 19.27.540. WSR 23-02-073, 23-12-103, and 23-20-023, § 51-50-1905, filed 1/4/23, 6/7/23, and 9/25/23, effective 3/15/24. Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 16-03-064, § 51-50-1905, filed 1/19/16, effective 7/1/16
• WSR 13-20-119, § 51-50-1905, filed 10/1/13, effective 11/1/13. Statutory Authority: RCW 19.27.031 and chapters 19.27 and 34.05 RCW. WSR 13-04-067, § 51-50-1905, filed 2/1/13, effective 7/1/13.

Wash. Admin. Code § 51-50-1908 Reserved.

History

• Statutory Authority: RCW 19.27.031, 19.27.074, and 19.27.540. WSR 23-02-073, 23-12-103, and 23-20-023, § 51-50-1908, filed 1/4/23, 6/7/23, and 9/25/23, effective 3/15/24. Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 16-03-064, § 51-50-1908, filed 1/19/16, effective 7/1/16. Statutory Authority: RCW 19.27.031 and chapters 19.27 and 34.05 RCW. WSR 13-04-067, § 51-50-1908, filed 2/1/13, effective 7/1/13.

Wash. Admin. Code § 51-50-1909 Reserved.

History

• Statutory Authority: RCW 19.27.031, 19.27.074, and 19.27.540. WSR 23-02-073, 23-12-103, and 23-20-023, § 51-50-1909, filed 1/4/23, 6/7/23, and 9/25/23, effective 3/15/24. Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 16-03-064, § 51-50-1909, filed 1/19/16, effective 7/1/16. Statutory Authority: RCW 19.27.031 and chapters 19.27 and 34.05 RCW. WSR 13-04-067, § 51-50-1909, filed 2/1/13, effective 7/1/13.

Wash. Admin. Code § 51-50-2103 Section 2103—Masonry construction materials.

2103.2.4 Mortar for adhered masonry veneer. Mortar for use with adhered masonry veneer shall conform to ASTM C270 for Type N or S, or shall comply with ANSI A118.4 or A118.15 for modified dry-set cement mortar. The cementitious bond coat shall comply with ANSI A118.4 or A118.15.

History

• Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 23-23-102, § 51-50-2103, filed 11/15/23, effective 3/16/24. Statutory Authority: RCW 19.27.031, 19.27.074, and 19.27.540. WSR 23-02-073, 23-12-103, and 23-20-023, § 51-50-2103, filed 1/4/23, 6/7/23, and 9/25/23, effective 3/15/24.

Wash. Admin. Code § 51-50-2104 Reserved.

History

• Statutory Authority: RCW 19.27.031, 19.27.074, and 19.27.540. WSR 23-02-073, 23-12-103, and 23-20-023, § 51-50-2104, filed 1/4/23, 6/7/23, and 9/25/23, effective 3/15/24. Statutory Authority: RCW 19.27.031 and chapters 19.27 and 34.05 RCW. WSR 13-04-067, § 51-50-2104, filed 2/1/13, effective 7/1/13. Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 10-03-097, § 51-50-2104, filed 1/20/10, effective 7/1/10.

Wash. Admin. Code § 51-50-2106 Reserved.

History

• Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 10-03-097, § 51-50-2106, filed 1/20/10, effective 7/1/10. Statutory Authority: RCW 19.27.074, 19.27.020, and chapters 70.92, 19.27, and 34.05 RCW. WSR 07-01-091, § 51-50-2106, filed 12/19/06, effective 7/1/07.

Wash. Admin. Code § 51-50-21070 Reserved.

History

• Statutory Authority: RCW 19.27.031, 19.27.074, and 19.27.540. WSR 23-02-073, 23-12-103, and 23-20-023, § 51-50-21070, filed 1/4/23, 6/7/23, and 9/25/23, effective 3/15/24. Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 20-21-021, § 51-50-21070, filed 10/9/20, effective 11/9/20
• WSR 20-01-090, § 51-50-21070, filed 12/12/19, effective 7/1/20
• WSR 16-03-064, § 51-50-21070, filed 1/19/16, effective 7/1/16. Statutory Authority: RCW 19.27.031 and chapters 19.27 and 34.05 RCW. WSR 13-04-067, § 51-50-21070, filed 2/1/13, effective 7/1/13. Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 10-03-097, § 51-50-21070, filed 1/20/10, effective 7/1/10.

Wash. Admin. Code § 51-50-2108 Section 2108—Reserved.

History

• Statutory Authority: RCW 19.27.031 and chapters 19.27 and 34.05 RCW. WSR 13-04-067, § 51-50-2108, filed 2/1/13, effective 7/1/13. Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 10-03-097, § 51-50-2108, filed 1/20/10, effective 7/1/10. Statutory Authority: RCW 19.27.020, 19.27.031, 19.27.074 and chapters 19.27 and 34.05 RCW. WSR 05-01-014, § 51-50-2108, filed 12/2/04, effective 7/1/05.

Wash. Admin. Code § 51-50-2111 Section 2111—Masonry fireplaces.

2111.8 Fireplaces. Fireplaces shall be provided with each of the following:

1. Tightly fitting flue dampers, operated by a readily accessible manual or approved automatic control.

| EXCEPTION: | Fireplaces with gas logs shall be installed in accordance with the International Mechanical Code Section 901, except that the standards for liquefied petroleum gas installations shall be NFPA 58 (Liquefied Petroleum Gas Code) and NFPA 54 (National Fuel Gas Code). | | --- | --- |

2. An outside source for combustion air ducted into the firebox. The duct shall be at least 6 square inches, and shall be provided with an operable outside air duct damper.

| EXCEPTION: | Washington certified fireplaces shall be installed with the combustion air systems necessary for their safe and efficient combustion and specified by the manufacturer in accordance with IBC Section 2115 (WAC 51-50-2115). | | --- | --- |

3. Site built fireplaces shall have tight fitting glass or metal doors, or a flue draft induction fan or as approved for minimizing back-drafting. Factory built fireplaces shall use doors listed for the installed appliance.

2111.8.1 Lintel and throat. Masonry over a fireplace opening shall be supported by a lintel of noncombustible material. The minimum required bearing length on each end of the fireplace opening shall be 4 inches (102 mm). The fireplace throat or damper shall be located a minimum of 8 inches (203 mm) above the top of the fireplace opening.

History

• Statutory Authority: RCW 19.27.031, 19.27.074, and 19.27.540. WSR 23-02-073, 23-12-103, and 23-20-023, § 51-50-2111, filed 1/4/23, 6/7/23, and 9/25/23, effective 3/15/24. Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 16-03-064, § 51-50-2111, filed 1/19/16, effective 7/1/16. Statutory Authority: RCW 19.27.031 and chapters 19.27 and 34.05 RCW. WSR 13-04-067, § 51-50-2111, filed 2/1/13, effective 7/1/13. Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 10-03-097, § 51-50-2111, filed 1/20/10, effective 7/1/10.

Wash. Admin. Code § 51-50-2114 Reserved.

History

• Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 20-21-021, § 51-50-2114, filed 10/9/20, effective 11/9/20. Statutory Authority: RCW 19.27.031 and chapters 19.27 and 34.05 RCW. WSR 13-04-067, § 51-50-2114, filed 2/1/13, effective 7/1/13. Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 04-01-108, § 51-50-2114, filed 12/17/03, effective 7/1/04.

Wash. Admin. Code § 51-50-2115 Section 2115—Emission standards.

2115.1 Emission standards for factory-built fireplaces. No new or used factory-built fireplace shall be installed in Washington state unless it is certified and labeled in accordance with procedures and criteria specified in ASTM E2558 Standard Test Method for determining particulate matter emission from fires in low mass wood burning fireplaces.

To certify an entire fireplace model line, the internal assembly shall be tested to determine its particulate matter emission performance. Retesting and recertifying is required if the design and construction specifications of the fireplace model line internal assembly change. Testing for certification shall be performed by a Washington state department of ecology (DOE) approved and U.S. Environmental Protection Agency (EPA) accredited laboratory.

2115.2 Emission standards for certified masonry and concrete fireplaces. Masonry and concrete fireplace model lines certified to Washington State Building Code Standard 31-2 prior to July 1, 2013, may retain certification provided the design and construction specifications of the fireplace model line internal assembly do not change.

History

• Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 20-21-021, § 51-50-2115, filed 10/9/20, effective 11/9/20.

Wash. Admin. Code § 51-50-2303 Section 2303—Minimum standards and quality.

2303.1.1.3 Used solid-sawn lumber. Used solid-sawn dimensional lumber in good condition and devoid of areas of decay, not meeting the requirements of Section 2303.1.1, 2303.1.1.1, or 2303.1.1.2, that has a nominal thickness of 2 inches with a nominal width of 6 inches or less, shall be assumed to be spruce-pine-fir stud grade and shall have structural properties assigned in accordance with current adopted standards. All other dimensional lumber shall be assumed to be hem-fir No. 2 grade and shall have structural properties assigned in accordance with current adopted standards.

2303.6 Nails and staples. Nails and staples shall conform to requirements of ASTM F1667, including Supplement 1. Nails used for framing and sheathing connections shall have minimum average bending yield strengths as follows: 80 kips per square inch (ksi) (551 MPa) for shank diameters larger than 0.177 inch (4.50 mm) but not larger than 0.254 inch (6.45 mm), 90 ksi (620 MPa) for shank diameters larger than 0.142 inch (3.61 mm) but not larger than 0.177 inch (4.50 mm) and 100 ksi (689 MPa) for shank diameters of not less than 0.099 inch (2.51 mm) but not larger than 0.142 inch (3.61 mm). Staples used for framing and sheathing connections shall have minimum average bending moments as follows: 3.6 in.-lbs (0.41 N-m) for No. 16 gage staples, 4.0 in.-lbs (0.45 N-m) for No. 15 gage staples, and 4.3 in.-lbs (0.49 N-m) for No. 14 gage staples. Staples allowable bending moments shall be listed on the construction documents.

History

• Statutory Authority: RCW 19.27.031, 19.27.074, and 19.27.540. WSR 23-02-073, 23-12-103, and 23-20-023, § 51-50-2303, filed 1/4/23, 6/7/23, and 9/25/23, effective 3/15/24. Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 20-01-090, § 51-50-2303, filed 12/12/19, effective 7/1/20
• WSR 19-02-038, § 51-50-2303, filed 12/26/18, effective 7/1/19.

Wash. Admin. Code § 51-50-2304 Section 2304—General construction requirements.

2304.11.2.1 Exterior walls.Exterior walls shall be permitted to be cross-laminated timber not less than 3.5 inches (88 mm) in actual thickness meeting the requirements of Section 2303.1.4.

2304.11.2.2 Interior walls and partitions. Interior walls and partitions shall be of solid wood construction formed by not less than two layers of 1-inch (25 mm) matched boards or laminated construction 3.5 inches (88 mm) in actual thickness, or of 1-hour fire-resistance-rated construction.

2304.11.3.1 Cross-laminated timber floors.Cross-laminated timber shall be not less than 3.5 inches (88 mm) in actual thickness. Cross-laminated timber shall be continuous from support to support and mechanically fastened to one another. Cross-laminated timber shall be permitted to be connected to walls without a shrinkage gap providing swelling or shrinking is considered in the design. Corbelling of masonry walls under the floor shall be permitted to be used.

2304.11.4.1 Cross-laminated timber roofs.Cross-laminated timber roofs shall be not less than 2.5 inches (63 mm) in actual thickness and shall be continuous from support to support and mechanically fastened to one another.

History

• Statutory Authority: RCW 19.27.031, 19.27.074, and 19.27.540. WSR 23-02-073, 23-12-103, and 23-20-023, § 51-50-2304, filed 1/4/23, 6/7/23, and 9/25/23, effective 3/15/24. Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 20-21-021, § 51-50-2304, filed 10/9/20, effective 11/9/20.

Wash. Admin. Code § 51-50-2400 Reserved.

History

• Statutory Authority: RCW 19.27.031, 19.27.074, and 19.27.540. WSR 23-02-073, 23-12-103, and 23-20-023, § 51-50-2400, filed 1/4/23, 6/7/23, and 9/25/23, effective 3/15/24. Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 10-03-097, § 51-50-2400, filed 1/20/10, effective 7/1/10.

Wash. Admin. Code § 51-50-2405 Section 2405—Sloped glazing and skylights.

2405.3 Screening. Where used in monolithic glazing systems, annealed, heat strengthened, fully tempered and wired glass shall have broken glass retention screens installed below the glazing material. The screens and their fastenings shall be:

1. Capable of supporting twice the weight of the glazing;

2. Firmly and substantially fastened to the framing members; and

3. Installed within 4 inches (102 mm) of the glass.

The screens shall be constructed of a noncombustible material not thinner than No. 12 B&S gage (0.0808 inch) with mesh not larger than 1 inch by 1 inch (25 mm by 25 mm). In a corrosive atmosphere, structurally equivalent noncorrosive screen materials shall be used. Annealed, heat strengthened, fully tempered and wired glass, when used in multiple-layer glazing systems as the bottom glass layer over the walking surface, shall be equipped with screening that conforms to the requirements for monolithic glazing systems.

| EXCEPTION: | In monolithic and multiple-layer sloped glazing systems, the following applies: | | --- | --- | | | 1. Fully tempered glass installed without protective screens where glazed between intervening floors at a slope of 30 degrees (0.52 rad) or less from the vertical plane shall have the highest point of the glass 10 feet (3048 mm) or less above the walking surface. | | | 2. Screens are not required below any glazing material, including annealed glass, where the walking surface below the glazing material is permanently protected from the risk of falling glass or the area below the glazing material is not a walking surface. | | | 3. Any glazing material, including annealed glass, is permitted to be installed without screens in the sloped glazing systems of commercial or detached noncombustible greenhouses used exclusively for growing plants and not open to the public, provided that the height of the greenhouse at the ridge does not exceed 30 feet (9144 mm) above grade. | | | 4. Screens shall not be required within individual dwelling units in Groups R-2, R-3, and R-4 where fully tempered glass is used as single glazing or as both panes in an insulating glass unit, and the following conditions are met: | | | 4.1. Each pane of the glass is 16 square feet (1.5 m2) or less in area. | | | 4.2. The highest point of the glass is 12 feet (3658 mm) or less above any walking surface or other accessible area. | | | 4.3. The glass thickness is 3/16 inch (4.8 mm) or less. | | | 5. Screens shall not be required for laminated glass with a 15 mil (0.38 mm) polyvinyl butyral (or equivalent) interlayer within the following limits: | | | 5.1. Each pane of glass is 16 square feet (1.5 m2) or less in area. | | | 5.2. The highest point of the glass is 12 feet (3658 mm) or less above a walking surface or other accessible area. |

History

• Statutory Authority: RCW 19.27.031, 19.27.074, and 19.27.540. WSR 23-02-073, 23-12-103, and 23-20-023, § 51-50-2405, filed 1/4/23, 6/7/23, and 9/25/23, effective 3/15/24.

Wash. Admin. Code § 51-50-2407 Reserved.

History

• Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 20-01-090, § 51-50-2407, filed 12/12/19, effective 7/1/20
• WSR 16-03-064, § 51-50-2407, filed 1/19/16, effective 7/1/16.

Wash. Admin. Code § 51-50-2603 Reserved.

History

• Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 20-01-090, § 51-50-2603, filed 12/12/19, effective 7/1/20
• WSR 16-03-064, § 51-50-2603, filed 1/19/16, effective 7/1/16.

Wash. Admin. Code § 51-50-2702 Section 2702—Emergency and standby power systems.

2702.1.5 Load duration. Emergency power systems and standby power systems shall be designed to provide the required power for a minimum duration of 8 hours without being refueled or recharged, unless specified otherwise in this code.

| EXCEPTION: | The minimum duration of all required power loads may be reduced to 2 hours for all systems except for fire pumps that require a minimum duration of 8 hours in accordance with NFPA 20. | | --- | --- |

History

• Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 20-01-090, § 51-50-2702, filed 12/12/19, effective 7/1/20.

Wash. Admin. Code § 51-50-2900 Reserved.

History

• Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 22-13-094, 23-12-103, and 23-20-023, § 51-50-2900, filed 6/14/22, 6/7/23, and 9/25/23, effective 3/15/24
• WSR 21-06-035, § 51-50-2900, filed 2/23/21, effective 3/26/21
• WSR 20-21-021, § 51-50-2900, filed 10/9/20, effective 11/9/20
• WSR 20-01-090, § 51-50-2900, filed 12/12/19, effective 7/1/20
• WSR 19-02-038, § 51-50-2900, filed 12/26/18, effective 7/1/19
• WSR 16-03-064, § 51-50-2900, filed 1/19/16, effective 7/1/16. Statutory Authority: RCW 19.27.074, 19.27.020, and 19.27.031. WSR 14-24-087, § 51-50-2900, filed 12/1/14, effective 5/1/15. Statutory Authority: RCW 19.27.031 and chapters 19.27 and 34.05 RCW. WSR 13-04-067, § 51-50-2900, filed 2/1/13, effective 7/1/13. Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 10-03-097, § 51-50-2900, filed 1/20/10, effective 7/1/10. Statutory Authority: RCW 19.27.074, 19.27.020, and chapters 70.92, 19.27, and 34.05 RCW. WSR 07-01-091, § 51-50-2900, filed 12/19/06, effective 7/1/07. Statutory Authority: RCW 19.27.020, 19.27.031, 19.27.074 and chapters 19.27 and 34.05 RCW. WSR 05-01-014, § 51-50-2900, filed 12/2/04, effective 7/1/05. Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 04-01-108, § 51-50-2900, filed 12/17/03, effective 7/1/04.

Wash. Admin. Code § 51-50-2901 Section 2901—General.

2901.1 Scope. The provisions of this chapter and the state plumbing code shall govern the design, construction, erection, and installation of plumbing components, appliances, equipment and systems used in buildings and structures covered by this code. Toilet and bathing rooms shall be constructed in accordance with Section 1210. The International Fire Code and the state plumbing code shall govern the use and maintenance of plumbing components, appliances, equipment and systems. The International Existing Building Code and the state plumbing code shall govern the alteration, repair, relocation, replacement and addition of plumbing components, appliances, equipment and systems.

2901.2 Health codes. In food preparation, serving and related storage areas, additional fixture requirements may be dictated by health codes.

2901.3 Fixed guideway transit and passenger rail systems. In construction of a fixed guideway and passenger rail system, subject to Section 3116, public plumbing fixtures are not required.

History

• Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 22-13-094, 23-12-103, and 23-20-023, § 51-50-2901, filed 6/14/22, 6/7/23, and 9/25/23, effective 3/15/24.

Wash. Admin. Code § 51-50-2902 Section 2902—Minimum plumbing facilities.

2902.1 Minimum number of fixtures. Plumbing fixtures shall be provided in the minimum number shown in Table 2902.1. Uses not shown in Table 2902.1 shall be determined individually by the building official based on the occupancy which most nearly resembles the proposed occupancy. The number of occupants shall be determined by this code. Plumbing fixtures need not be provided for unoccupied buildings or facilities.

2902.1.1.1 Private offices. Fixtures only accessible to private offices shall not be counted to determine compliance with this section.

2902.1.1.2 Urinals in men's facilities. Where urinals in men's facilities are provided, one water closet less than the number specified may be provided for each urinal installed, except the number of water closets in such cases shall not be reduced to less than one quarter (25 percent) of the minimum specified.

2902.1.1.3 Urinals in all-gender facilities. Where urinals are provided in all-gender facilities, one water closet less than the number specified may be provided for each urinal installed, except the number of water closets in such cases shall not be reduced less than one quarter (25 percent) of the minimum specified.

2902.2 Separate facilities. Where plumbing fixtures are required, separate facilities shall be provided for each sex.

| EXCEPTIONS: | 1. Separate facilities shall not be required for dwelling units and sleeping units. | | --- | --- | | | 2. Separate facilities shall not be required in structures or tenant spaces with a total occupant load, including both employees and customers, of 15 or fewer. | | | 3. Separate facilities shall not be required in mercantile occupancies in which the maximum occupant load is 100 or fewer. | | | 4. Separate facilities shall not be required in business occupancies in which the maximum occupant load is 25 or fewer. | | | 5. Separate facilities shall not be required in spaces primarily used for drinking or dining with a total occupant load, including both employees and customers, of 30 or fewer. | | | 6. Separate facilities shall not be required when all-gender facilities are provided in accordance with Section 2902.2.2. | | | 7. Separate facilities shall not be required where rooms having both water closets and lavatory fixtures are designed for use by both sexes and privacy for water closets are installed in accordance with Section 1210.3.1. Urinals shall be located in an area visually separated from the remainder of the facility or each urinal that is provided shall be located in a stall. |

2902.2.2 All-gender facilities. All-gender toilet facilities, when provided, shall be in accordance with the following:

1. There is no reduction in the number of fixtures required to be provided for male and female in the type of occupancy and in the minimum number shown in Table 2902.1.

2. All-gender multiuser toilet rooms shall have water closets and urinals located in toilet compartments in accordance with ICC A117.1.

3. All-gender multiuser toilet room water closet and urinal compartments shall have full-height walls and a door enclosing the fixture to ensure privacy.

4. All-gender toilet room water closet and urinal compartment doors shall be securable from within the compartment.

5. All-gender toilet rooms provided for the use of multiple occupants, the egress door from the room shall not be lockable from the inside of the room.

6. Compartments shall not be required in a single-occupant toilet room with a lockable door.

2902.3 Employee and public toilet facilities. For structures and tenant spaces intended for public utilization, customers, patrons and visitors shall be provided with public toilet facilities. Employees associated with structures and tenant spaces shall be provided with toilet facilities. The number of plumbing fixtures located within the required toilet facilities shall be provided in accordance with Section 2902 for all users. Employee toilet facilities shall be either separate or combined employee and public toilet facilities.

| EXCEPTION: | Public toilet facilities shall not be required for: | | --- | --- | | | 1. Parking garages where operated without parking attendants. | | | 2. Structures and tenant spaces intended for quick transactions, including takeout, pickup and drop-off, having a public access area less than or equal to 300 square feet (28 m2). | | | 3. Fixed guideway transit and passenger rail systems constructed in accordance with Section 3116. |

2902.3.3 Location of toilet facilities in occupancies other than malls. In occupancies other than covered and open mall buildings, the required public and employee toilet facilities shall be located in each building not more than one story above or below the space required to be provided with toilet facilities, or conveniently in a building adjacent thereto on the same property, and the path of travel to such facilities shall not exceed a distance of 500 feet (152 m).

| EXCEPTIONS: | 1. The location and maximum distances of travel to required employee facilities in factory and industrial occupancies shall be permitted to exceed that required by this section, provided that the location and maximum distance of travel are approved. | | --- | --- | | | 2. The location and maximum distances of travel to required public and employee facilities in Group S occupancies shall be permitted to exceed that required by this section, provided that the location and maximum distances of travel are approved. |

2902.5 Drinking fountain location. Drinking fountains shall not be required to be located in individual tenant spaces provided that public drinking fountains are located within a distance of travel of 500 feet of the most remote location in the tenant space and not more than one story above or below the tenant space. Where the tenant space is in a covered or open mall, such distance shall not exceed 300 feet. Drinking fountains shall be located on an accessible route. Drinking fountains shall not be located in toilet rooms.

2902.5.1 Drinking fountain number. Occupant loads over 30 shall have one drinking fountain for the first 150 occupants, then one per each additional 500 occupants.

| EXCEPTIONS: | 1. Sporting facilities with concessions serving drinks shall have one drinking fountain for each 1000 occupants. | | --- | --- | | | 2. A drinking fountain need not be provided in a drinking or dining establishment. |

2902.5.2 Multistory buildings. Drinking fountains shall be provided on each floor having more than 30 occupants in schools, dormitories, auditoriums, theaters, offices and public buildings.

2902.5.3 Penal institutions. Penal institutions shall have one drinking fountain on each cell block floor and one on each exercise floor.

2902.5.4 Bottle filling stations. Bottle filling stations shall be provided in accordance with Sections 2902.5.4.1 through 2902.5.4.3.

2902.5.4.1 Group E occupancies. In Group E occupancies with an occupant load over 30, a minimum of one bottle filling station shall be provided on each floor. This bottle filling station may be integral to a drinking fountain.

2902.5.4.2 Substitution. In all occupancies that require more than two drinking fountains per floor or secured area, bottle filling stations shall be permitted to be substituted for up to 50 percent of the required number of drinking fountains.

2902.5.4.3 Accessibility. At least one of the required bottle filling stations shall be located in accordance with Section 309 of ICC A117.1.

2902.6 Small occupancies. This section is not adopted.

2902.8 Dwelling units. Dwelling units shall be provided with a kitchen sink.

2902.9 Water. Each required sink, lavatory, bathtub and shower stall shall be equipped with hot and cold running water necessary for its normal operation.

SECTION 2903—RESERVED.

SECTION 2904—RESERVED.

Table 2902.1

Minimum Number of Required Plumbing Fixturesa

(See Sections 2902.2 and 2902.3)

| No. | Classification | Occupancy | Description | Water Closets | Lavatories | Bathtubs/ Showers | | | | --- | --- | --- | --- | --- | --- | --- | --- | --- | | Male | Female | Male | Female | | | | | | | 1 | Assembly | A-1d | Theaters and other buildings for the performing arts and motion pictures | 1 per 125 | 1 per 65 | 1 per 200 | — | | | | | A-2d | Nightclubs, bars, taverns, dance halls and buildings for similar purposes | 1 per 40 | 1 per 40 | 1 per 75 | — | | | | | | Restaurants, banquet halls and food courts | 1 per 75 | 1 per 75 | 1 per 200 | — | | | | | A-3d | Auditoriums without permanent seating, art galleries, exhibition halls, museums, lecture halls, libraries, arcades and gymnasiums | 1 per 125 | 1 per 65 | 1 per 200 | — | | | | | | Passenger terminals and transportation facilities | 1 per 500 | 1 per 500 | 1 per 750 | — | | | | | | Places of worship and other religious services | 1 per 150 | 1 per 75 | 1 per 200 | — | | | | | A-4 | Coliseums, arenas, skating rinks, pools, and tennis courts for indoor sporting events and activities | 1 per 75 for first 1,500 and 1 per 120 for remainder exceeding 1,500 | 1 per 40 for first 1,520 and 1 per 60 for remainder exceeding 1,520 | 1 per 200 | 1 per 150 | — | | | | A-5 | Stadiums, amusement parks, bleachers and grandstands for outdoor sporting events and activities | 1 per 75 for first 1,500 and 1 per 120 for remainder exceeding 1,500 | 1 per 40 for first 1,520 and 1 per 60 for remainder exceeding 1,520 | 1 per 200 | 1 per 150 | — | | 2 | Business | B | Buildings for the transaction of business, professional services, other services involving merchandise, office buildings, banks, light industrial and similar uses | 1 per 25 for first 50 and 1 per 50 for the remainder exceeding 50 | 1 per 40 for first 80 and 1 per 80 for remainder exceeding 80 | — | | | | 3 | Educational | Ee | Educational facilities | 1 per 35 | 1 per 25 | 1 per 85 | 1 per 50 | — | | 4 | Factory and industrial | F-1 and F-2 | Structures in which occupants are engaged in work fabricating, assembling or processing of products or materials | 1 per 100 | 1 per 100 | Check State (UPC) | | | | 5 | Institutional | I-1 | Residential care | 1 per 10 | 1 per 10 | 1 per 8 | | | | | | I-2 | Hospitals, ambulatory nursing home care recipientb | 1 per roomc | 1 per roomc | 1 per 15 | | | | | | | Employees, other than residential careb | 1 per 25 | 1 per 35 | — | | | | | | | Visitors other than residential care | 1 per 75 | 1 per 100 | — | | | | | | I-3 | Prisonsb | 1 per cell | 1 per cell | 1 per 15 | | | | | | | Reformatories, detention centers and correctional centersb | 1 per 15 | 1 per 15 | 1 per 15 | | | | | | | Employeesb | 1 per 25 | 1 per 35 | — | | | | | | I-4 | Adult day care and child day care | 1 per 15 | 1 per 15 | 1 | | | | 6 | Mercantile | M | Retail stores, service stations, shops, salesrooms, markets and shopping centers | 1 per 500 | 1 per 750 | — | | | | 7 | Residential | R-1 | Hotels, motels, boarding houses (transient) | 1 per sleeping unit | 1 per sleeping unit | 1 per sleeping unit | | | | | | R-2 | Dormitories, fraternities, sororities and boarding houses (not transient) | 1 per 10 | 1 per 10 | 1 per 8 | | | | | | | Apartment house | 1 per dwelling unit | 1 per dwelling unit | 1 per dwelling unit | | | | | | R-3 | One- and two-family dwellings | 1 per dwelling unit | 1 per 10 | 1 per dwelling unit | | | | | | | Congregate living facilities with 16 or fewer persons | 1 per 10 | 1 per 10 | 1 per 8 | | | | | | R-4 | Congregate living facilities with 16 or fewer persons | 1 per 10 | 1 per 10 | 1 per 8 | | | | 8 | Storage | S-1 S-2 | Structures for the storage of goods, warehouses, storehouses and freight depots, low and moderate hazard | 1 per 100 | 1 per 100 | Check State (UPC) | | |

| a. | The fixtures shown are based on one fixture being the minimum required for the number of persons indicated or any fraction of the number of persons indicated. The number of occupants shall be determined by this code, except with respect to Group E occupancies the provisions of note "e" shall apply. | | --- | --- | | b. | Toilet facilities for employees shall be separate from facilities for inmates or care recipients. | | c. | A single-occupant toilet room with one water closet and one lavatory serving not more than two adjacent patient sleeping units shall be permitted where such room is provided with direct access from each patient sleeping unit and with provisions for privacy. | | d. | The occupant load for seasonal outdoor seating and entertainment areas shall be included when determining the minimum number of facilities required. | | e. | For Group E occupancies: The number of occupants shall be determined by using a calculation of 100 square feet gross building area per student for the minimum number of plumbing fixtures. |

History

• Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 23-23-102, § 51-50-2902, filed 11/15/23, effective 3/16/24
• WSR 22-13-094, 23-12-103, and 23-20-023, § 51-50-2902, filed 6/14/22, 6/7/23, and 9/25/23, effective 3/15/24.

Wash. Admin. Code § 51-50-3001 Reserved.

History

• Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 20-01-090, § 51-50-3001, filed 12/12/19, effective 7/1/20. Statutory Authority: RCW 19.27.031 and chapters 19.27 and 34.05 RCW. WSR 13-04-067, § 51-50-3001, filed 2/1/13, effective 7/1/13. Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 10-03-097, § 51-50-3001, filed 1/20/10, effective 7/1/10. Statutory Authority: RCW 19.27.190, 19.27.020, and chapters 19.27 and 34.05 RCW. WSR 08-01-110, § 51-50-3001, filed 12/18/07, effective 4/1/08. Statutory Authority: RCW 19.27.074, 19.27.020, and chapters 70.92, 19.27, and 34.05 RCW. WSR 07-01-091, § 51-50-3001, filed 12/19/06, effective 7/1/07. Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 04-01-108, § 51-50-3001, filed 12/17/03, effective 7/1/04.

Wash. Admin. Code § 51-50-30020 Section 30020—Hoistway enclosures.

3002.4 Elevator car to accommodate ambulance stretcher.

In buildings provided with an elevator, at least one elevator shall provide fire department emergency access to all floors served in:

1. Buildings four or more stories above or below grade plane; and

2. Any R-1, R-2, or I occupancy building regardless of the number of stories.

The elevator car shall be of a size and arrangement to accommodate a 24-inch by 84-inch (610 mm by 2134 mm) ambulance stretcher with not less than 5-inch (127 mm) radius corners, in the horizontal, open position. The elevator shall be identified by the international symbol for emergency medical services (star of life). The symbol shall not be less than 3 inches (76 mm) in height and shall be placed inside on both sides of the hoistway door frame on both the designated level and the alternate level.

| EXCEPTION: | Private residence elevators are not required to comply with this section. | | --- | --- |

History

• Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 23-23-102, § 51-50-30020, filed 11/15/23, effective 3/16/24
• WSR 20-01-090, § 51-50-30020, filed 12/12/19, effective 7/1/20
• WSR 16-03-064, § 51-50-30020, filed 1/19/16, effective 7/1/16.

Wash. Admin. Code § 51-50-3004 Reserved.

History

• Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 22-13-094, 23-12-103, and 23-20-023, § 51-50-3004, filed 6/14/22, 6/7/23, and 9/25/23, effective 3/15/24
• WSR 16-03-064, § 51-50-3004, filed 1/19/16, effective 7/1/16. Statutory Authority: RCW 19.27.074, 19.27.020, and chapters 70.92, 19.27, and 34.05 RCW. WSR 07-01-091, § 51-50-3004, filed 12/19/06, effective 7/1/07. Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 04-01-108, § 51-50-3004, filed 12/17/03, effective 7/1/04.

Wash. Admin. Code § 51-50-30050 Section 3005—Machine rooms.

3005.2 Temperature control. Elevator machine rooms, machinery spaces that contain the driving machine, and control rooms or spaces that contain the operation or motion controller for elevator operation shall be provided with an independent dedicated ventilation or air-conditioning system to control the space temperature to protect against the overheating of the electrical equipment. Ventilation systems shall use outdoor make up air pathway that does not rely on transfer air from other building systems. The system shall service the equipment space only, and shall be capable of maintaining the temperature and humidity within the range established by the manufacturer's specifications. Where no manufacturer specifications are available, the equipment space temperature shall be maintained at no less than fifty-five degrees Fahrenheit and no more than ninety degrees Fahrenheit.

The cooling load for the equipment shall include the BTU output of the elevator operation equipment as specified by the manufacturer based on one hour of continuous operation. The outdoor design temperature for ventilation shall be from the 0.5% column for summer from the Puget Sound Chapter of ASHRAE publication "Recommended Outdoor Design Temperatures, Washington State." The following formula shall be used to calculate flow rate for ventilation:

CFM = BTU output of elevator machine room equipment/[1.08 x (acceptable machine room temp - make up air temp)]

The ventilation or air-conditioning system will be provided with the same source of power (normal, optional standby, legally required standby, or emergency) as the elevator equipment so that the temperature control is available at all times that the elevators have power.

| EXCEPTION: | For buildings four stories or less, natural or mechanical means may be used in lieu of an independent ventilation or air-conditioning system to keep the equipment space ambient air temperature and humidity in the range specified by the elevator equipment manufacturer. | | --- | --- |

Reviser's note: The brackets and enclosed material in the text of the above section occurred in the copy filed by the agency.

Wash. Admin. Code § 51-50-3006 Section 3006—Elevator lobbies and hoistway opening protection.

3006.3 Hoistway opening protection. Where Section 3006.2 requires protection of the elevator hoistway door opening, the protection shall be provided by one of the following:

1. An enclosed elevator lobby shall be provided at each floor to separate the elevator hoistway shaft enclosure doors from each floor by fire partitions in accordance with Section 708. In addition, doors protecting openings in the elevator lobby enclosure walls shall comply with Section 716.2.2.1 as required for corridor walls. Penetrations of the enclosed elevator lobby by ducts and air transfer openings shall be protected as required for corridors in accordance with Section 717.5.4.1.

2. An enclosed elevator lobby shall be provided at each floor to separate the elevator hoistway shaft enclosure doors from each floor by smoke partitions in accordance with Section 710 where the building is equipped throughout with an automatic sprinkler system installed in accordance with Section 903.3.1.1 or 903.3.1.2. In addition, doors protecting openings in the smoke partitions shall comply with Sections 710.5.2.2, 710.5.2.3, and 716.2.6.1. Penetrations of the enclosed elevator lobby by ducts and air transfer openings shall be protected as required for corridors in accordance with Section 717.5.4.1.

3. Additional doors shall be provided at each elevator hoistway door opening in accordance with Section 3002.6. Such door shall comply with the smoke and draft control door assembly requirements in Section 716.2.2.1.1 when tested in accordance with UL 1784 without an artificial bottom seal.

4. The elevator hoistway shall be pressurized in accordance with Sections 909.6.3 and 909.21.

History

• Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 23-23-102, § 51-50-3006, filed 11/15/23, effective 3/16/24
• WSR 20-01-103, § 51-50-3006, filed 12/13/19, effective 7/1/20
• WSR 16-03-064, § 51-50-3006, filed 1/19/16, effective 7/1/16. Statutory Authority: RCW 19.27.074, 19.27.020, and chapters 70.92, 19.27, and 34.05 RCW. WSR 07-01-091, § 51-50-3006, filed 12/19/06, effective 7/1/07. Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 04-01-108, § 51-50-3006, filed 12/17/03, effective 7/1/04.

Wash. Admin. Code § 51-50-3009 Reserved.

History

• Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 20-01-090, § 51-50-3009, filed 12/12/19, effective 7/1/20
• WSR 16-03-064, § 51-50-3009, filed 1/19/16, effective 7/1/16.

Wash. Admin. Code § 51-50-3101 Section 3101—General.

3101.1 Scope. The provisions of this chapter shall govern special building construction including membrane structures, temporary structures, pedestrian walkways and tunnels, automatic vehicular gates, awnings and canopies, marquees, signs, towers, antennas, relocatable buildings, swimming pool enclosures and safety devices, solar energy systems and fixed guideway transit and passenger rail systems, public use restroom buildings on publicly owned lands in flood hazard areas, and intermodal shipping containers.

History

• Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 23-23-102, § 51-50-3101, filed 11/15/23, effective 3/16/24
• WSR 22-13-094, 23-12-103, and 23-20-023, § 51-50-3101, filed 6/14/22, 6/7/23, and 9/25/23, effective 3/15/24
• WSR 20-01-090, § 51-50-3101, filed 12/12/19, effective 7/1/20.

Wash. Admin. Code § 51-50-3102 Reserved.

History

• Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 22-13-094, 23-12-103, and 23-20-023, § 51-50-3102, filed 6/14/22, 6/7/23, and 9/25/23, effective 3/15/24
• WSR 19-02-038, § 51-50-3102, filed 12/26/18, effective 7/1/19.

Wash. Admin. Code § 51-50-3103 Temporary structures.

3103.1 General. The provisions of this section shall apply to structures erected for a period of less than 180 days. Special event structures, tents, umbrella structures and other membrane structures erected for a period of less than 180 days shall also comply with the International Fire Code. Those erected for a longer period of time shall comply with applicable sections of this code.

| EXCEPTION: | The building official may authorize unheated tents and yurts under 500 square feet (46 m2) accommodating an R-1 Occupancy for recreational use as a temporary structure and allow them to be used indefinitely. | | --- | --- |

History

• Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 23-23-102, § 51-50-3103, filed 11/15/23, effective 3/16/24
• WSR 22-13-094, 23-12-103, and 23-20-023, § 51-50-3103, filed 6/14/22, 6/7/23, and 9/25/23, effective 3/15/24. Statutory Authority: RCW 19.27.074, 19.27.020, and chapters 70.92, 19.27, and 34.05 RCW. WSR 07-01-091, § 51-50-3103, filed 12/19/06, effective 7/1/07.

Wash. Admin. Code § 51-50-3108 Section 3108—Reserved.

History

• Statutory Authority: RCW 19.27.031 and chapters 19.27 and 34.05 RCW. WSR 13-04-067, § 51-50-3108, filed 2/1/13, effective 7/1/13. Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 10-03-097, § 51-50-3108, filed 1/20/10, effective 7/1/10.

Wash. Admin. Code § 51-50-3109 Section 3109—Swimming pools, spas and other water recreation devices.

3109.1 General. The design and construction of swimming pools, spas and other aquatic recreation facilities shall comply with the International Swimming Pool and Spa Code, where the facility is one of the following:

1. For the sole use of residents and invited guests at a single-family dwelling;

2. For the sole use of residents and invited guests of a duplex owned by the residents; or

3. Operated exclusively for physical therapy or rehabilitation and under the supervision of a licensed medical practitioner.

All other "water recreation facilities" as defined in RCW 70.90.110 are regulated under chapters 246-260 and 246-262 WAC.

History

• Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 16-03-064, § 51-50-3109, filed 1/19/16, effective 7/1/16. Statutory Authority: RCW 19.27.074, 19.27.020, and chapters 70.92, 19.27, and 34.05 RCW. WSR 07-01-091, § 51-50-3109, filed 12/19/06, effective 7/1/07.

Wash. Admin. Code § 51-50-3114 Reserved.

History

• Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 22-13-094, 23-12-103, and 23-20-023, § 51-50-3114, filed 6/14/22, 6/7/23, and 9/25/23, effective 3/15/24
• WSR 20-01-090, § 51-50-3114, filed 12/12/19, effective 7/1/20.

Wash. Admin. Code § 51-50-3116 Section 3116—Fixed guideway transit and passenger rail systems.

3116.1 Construction. Construction of fixed guideway transit and passenger rail systems shall be in accordance with NFPA 130-2020, standard for fixed guideway transit and passenger rail systems, as modified in Section 3116.2.

3116.2 Modifications to NFPA 130.

5.2.2.1 Building construction for stations shall be in accordance with Table 5.2.2.1 based upon station configuration.

5.2.2.2 Construction types shall conform to the requirements in IBC Chapter 6, unless otherwise exempted in this section.

Table 5.2.2.1

Minimum Construction Requirements for New Station Structures

| Station Configuration | Construction Type† | | --- | --- | | Stations erected entirely above grade and in a separate building: | | | Open stations | Type IIB | | Enclosed stations | Type IIA | | Stations erected entirely or partially below grade: | | | Open above grade portions of below grade structures* | Type IIA | | Below grade portions of structures | Type IB | | Below grade structures with occupant loads exceeding 1000 | Type IA |

| * | Roofs not supporting an occupancy above are not required to have a fire resistance rating. | | --- | --- | | † | Construction types are in accordance with the IBC. |

5.2.4.3 Ancillary spaces. Fire resistance ratings of separations between ancillary occupancies shall be established as required for accessory occupancies and incidental uses by the IBC and in accordance with ASTM E119 and ANSI/UL 263.

5.2.5.4 Materials used as interior finish in open stations shall comply with the requirements of IBC, Chapter 8.

5.3.1* General.

5.3.1.1 The provisions for means of egress for a station shall comply with IBC, Chapter 10, except as herein modified.

5.3.2 Occupant load.

5.3.2.1 The occupant load for a station shall be based on the train load of trains simultaneously entering the station on all tracks in normal traffic direction plus the simultaneous entraining load awaiting trains.

1. The train load shall consider only one train at any one track, inside a station.

2. The basis for calculating train and entraining loads shall be the peak period ridership figures as projected for design of a new system or as updated for an operating system.

5.3.2.2* For station(s) servicing areas such as civic centers, sports complexes, and convention centers, the peak ridership figures shall consider events that establish occupant loads not included in normal passenger loads.

5.3.2.2.1 Where station occupancy is anticipated to be greater than design capacity during a major event the operating agency shall initiate approved measures to restrict access to the station, when required by the fire code official, to ensure existing means of egress are adequate as an alternate to account for peak ridership associated with major events.

5.3.2.3 At multilevel, multiline, or multiplatform stations, occupant loads shall be determined as follows:

1. The maximum occupant load for each platform shall be considered separately for the purpose of sizing the means of egress from that platform.

2.* Simultaneous loads shall be considered for all egress routes passing through each level of that station.

5.3.2.4 Where an area within a station is intended for use by other than passengers or employees, the following parameters shall apply:

1. The occupant load for that area shall be determined in accordance with the provisions of the IBC as appropriate for the use.

2. The additional occupant load shall be included in determining the required egress from that area.

3. The additional occupant load shall be permitted to be omitted from the station occupant load where the area has independent means of egress of sufficient number and capacity.

5.3.3.4 Travel distance. For open stations the maximum travel distance on the platform to a point at which a means of egress route leaves the platform shall not exceed 100 m (325 ft). For enclosed stations the travel distance to an exit shall not exceed 76 m (250 ft).

5.3.5 Stairs and escalators.

5.3.5.1 Stairs and escalators permitted by Section 5.2.4.1 to be unenclosed shall be permitted to be counted as contributing to the egress capacity in stations as detailed in Sections 5.2.2 and 5.3.3.

5.3.5.2 Stairs in the means of egress shall be a minimum of 1120 mm (44 in.) wide.

5.3.5.3* Capacity and travel speed for stairs and escalators shall be computed as follows:

1. Capacity - 0.0555 p/mm-min (1.41 p/in.-min)

2.* Travel speed - 14.6 m/min (48 ft/min) (indicates vertical component of travel speed)

5.3.5.4 Escalators shall not account for more than one-half of the egress capacity at any one level.

5.3.5.6* In calculating the egress capacity of escalators, the following criteria shall be met:

1. One escalator at each level shall be considered as being out of service.

2. The escalator chosen shall be the one having the most adverse effect upon egress capacity.

5.3.5.7 Where escalators are permitted as a means of egress in stations, the following criteria shall be met:

1.* The escalators shall be constructed of noncombustible materials.

2.* Escalators running in the direction of egress shall be permitted to remain operating.

3. Escalators running reverse to the direction of egress shall be capable of being stopped locally and remotely as follows:

a. Locally by a manual stopping device at the escalator.

b. Remotely by one of the following:

i. A manual stopping device at a remote location.

ii. As part of a preplanned evacuation response.

4.* Where provision is made for remote stopping of escalators counted as means of egress, one of the following shall apply:

a. The stop shall be delayed until it is preceded by a minimum 15-second audible signal or warning message sounded at the escalator.

b. Where escalators are equipped with the necessary controls to decelerate in a controlled manner under the full rated load, the stop shall be delayed for at least 5 seconds before beginning deceleration, and the deceleration rate shall be no greater than 0.052 m/sec2 (0.17 ft/sec2).

5. Where an audible signal or warning message is used, the following shall apply:

a. The signal or message shall have a sound intensity that is at least 15 dBA above the average ambient sound level for the entire length of the escalator.

b. The signal shall be distinct from the fire alarm signal.

c. The warning message shall meet audibility and intelligibility requirements.

5.3.7* Doors, gates, security grilles, and exit hatches.

5.3.7.1 The egress capacity for doors and gates in a means of egress serving public areas shall be computed as follows:

1. Sixty people per minute (p/min) for single leaf doors and gates.

2.* 0.0819 p/mm-min (2.08 p/in.-min) for bi-parting multileaf doors and gates measured for the clear width dimension.

5.3.7.2 Gates in a means of egress shall be designed in accordance with the requirements for doors serving as a means of egress.

5.3.7.2.1 Security grilles are allowed when designed and operated in accordance with the IBC.

5.3.7.3 Where used, exit hatches shall comply with the requirements of Sections 6.3.3.15 through 6.3.3.17.

5.3.9* Horizontal exits. Horizontal exits shall comply with IBC Section 1026.

5.3.11 Means of egress lighting.

5.3.11.1 Illumination of the means of egress in stations, including escalators that are considered a means of egress, shall be in accordance with IBC Section 1008.

5.3.11.2 Means of egress, including escalators considered as means of egress, shall be provided with a system of emergency lighting in accordance with IBC Section 1008

5.3.11.3 In addition to the requirements of Sections 5.3.11.1 and 5.3.11.2:

1. Lighting for stairs and escalators shall be designed to emphasize illumination on the top and bottom steps and landings.

2. Where newel- and comb-lighting is provided for escalator steps, such lighting shall be on emergency power circuits.

History

• Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 23-23-102, § 51-50-3116, filed 11/15/23, effective 3/16/24
• WSR 22-13-094, 23-12-103, and 23-20-023, § 51-50-3116, filed 6/14/22, 6/7/23, and 9/25/23, effective 3/15/24.

Wash. Admin. Code § 51-50-3304 Reserved.

History

• Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 22-13-094, 23-12-103, and 23-20-023, § 51-50-3304, filed 6/14/22, 6/7/23, and 9/25/23, effective 3/15/24
• WSR 21-06-035, § 51-50-3304, filed 2/23/21, effective 3/26/21
• WSR 20-01-090, § 51-50-3304, filed 12/12/19, effective 7/1/20.

Wash. Admin. Code § 51-50-3314 Section 3314—Fire watch during construction.

3314.1 Fire watch during construction. Where required by the fire code official, a fire watch shall be provided during nonworking hours for new construction that exceeds 40 feet (12,192 mm) in height above the lowest adjacent grade.

| EXCEPTIONS: | 1. New construction that is built under the IRC. | | --- | --- | | | 2. New construction less than 5 stories and 50,000 square feet (4645 m2) per story. |

History

• Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 23-23-102, § 51-50-3314, filed 11/15/23, effective 3/16/24
• WSR 22-13-094, 23-12-103, and 23-20-023, § 51-50-3314, filed 6/14/22, 6/7/23, and 9/25/23, effective 3/15/24.

Wash. Admin. Code § 51-50-3401 Reserved.

History

• Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 22-13-094, 23-12-103, and 23-20-023, § 51-50-3401, filed 6/14/22, 6/7/23, and 9/25/23, effective 3/15/24
• WSR 16-03-064, § 51-50-3401, filed 1/19/16, effective 7/1/16. Statutory Authority: RCW 19.27.031 and chapters 19.27 and 34.05 RCW. WSR 13-04-067, § 51-50-3401, filed 2/1/13, effective 7/1/13. Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 10-03-097, § 51-50-3401, filed 1/20/10, effective 7/1/10.

Wash. Admin. Code § 51-50-3404 Reserved.

History

• Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 22-13-094, 23-12-103, and 23-20-023, § 51-50-3404, filed 6/14/22, 6/7/23, and 9/25/23, effective 3/15/24
• WSR 16-03-064, § 51-50-3404, filed 1/19/16, effective 7/1/16
• WSR 10-03-097, § 51-50-3404, filed 1/20/10, effective 7/1/10.

Wash. Admin. Code § 51-50-3410 Reserved.

History

• Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 22-13-094, 23-12-103, and 23-20-023, § 51-50-3410, filed 6/14/22, 6/7/23, and 9/25/23, effective 3/15/24
• WSR 16-03-064, § 51-50-3410, filed 1/19/16, effective 7/1/16
• WSR 10-03-097, amended and recodified as § 51-50-3410, filed 1/20/10, effective 7/1/10
• WSR 04-01-108, § 51-50-3408, filed 12/17/03, effective 7/1/04.

Wash. Admin. Code § 51-50-3411 Reserved.

History

• Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 22-13-094, 23-12-103, and 23-20-023, § 51-50-3411, filed 6/14/22, 6/7/23, and 9/25/23, effective 3/15/24
• WSR 16-03-064, § 51-50-3411, filed 1/19/16, effective 7/1/16. Statutory Authority: RCW 19.27.031 and chapters 19.27 and 34.05 RCW. WSR 13-04-067, § 51-50-3411, filed 2/1/13, effective 7/1/13. Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 10-03-097, amended and recodified as § 51-50-3411, filed 1/20/10, effective 7/1/10. Statutory Authority: RCW 19.27.074, 19.27.020, and chapters 70.92, 19.27, and 34.05 RCW. WSR 07-01-091, § 51-50-3409, filed 12/19/06, effective 7/1/07. Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 04-01-108, § 51-50-3409, filed 12/17/03, effective 7/1/04.

Wash. Admin. Code § 51-50-3500 Chapter 35—Referenced standards.

Add the reference standards as follows:

| Standard reference number | Title | Referenced in code section number | | --- | --- | --- | | ASCE/SEI 7-16 | Minimum Design Loads and Associated Criteria for Buildings and Other Structures with Supplement No.1, Supplement No. 2, and Supplement No. 3. | No amendments to the referenced sections | | ASCE/SEI 7-22 | Minimum Design Loads and Associated Criteria for Buildings and Other Structures | 1615.1 | | NFPA 130-20 | Standard for Fixed Guideway Transit and Passenger Rail Systems | 3101.1, 3116 | | NFPA 13-19 | Standard for the Installation of Sprinkler Systems (except 9.3.6.3.5) | 403.3.3, 712.1.3.1, 903.3.1.1, 903.3.2, 903.3.8.2, 903.8.5, 904.13, 905.3.4, 907.6.4, 1019.3 |

History

• Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 23-23-102, § 51-50-3500, filed 11/15/23, effective 3/16/24. Statutory Authority: RCW 19.27.031, 19.27.074, and 19.27.540. WSR 23-02-073, 23-12-103, and 23-20-023, § 51-50-3500, filed 1/4/23, 6/7/23, and 9/25/23, effective 3/15/24. Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 22-13-094 , 23-12-103, and 23-20-023, § 51-50-3500, filed 6/14/22, 6/7/23, and 9/25/23, effective 3/15/24
• WSR 20-21-021, § 51-50-3500, filed 10/9/20, effective 11/9/20
• WSR 20-01-090, § 51-50-3500, filed 12/12/19, effective 7/1/20
• WSR 19-02-038, § 51-50-3500, filed 12/26/18, effective 7/1/19
• WSR 16-03-064, § 51-50-3500, filed 1/19/16, effective 7/1/16. Statutory Authority: RCW 19.27.031 and chapters 19.27 and 34.05 RCW. WSR 13-04-067, § 51-50-3500, filed 2/1/13, effective 7/1/13.

Wash. Admin. Code § 51-50-4700 Appendix P—Construction and demolition material management.

P101 General

P101.1 Purpose. The purpose of this code is to increase the reuse and recycling of construction and demolition materials.

P101.2 Scope. This code applies to new building construction, alterations to existing buildings and the demolition of existing buildings having a work area greater than 750 square feet or a project value greater than $75,000, whichever is more restrictive.

| EXCEPTION: | Projects determined to be unsafe pursuant to Section 116. | | --- | --- |

P102 General definitions.

Demolition. The process of razing, relocating, or removing an existing building or structure, or a portion thereof.

Divert, diverted, or diversion. The reuse, recycling, or beneficial use of construction and demolition materials.

Recycling. The process of transforming or remanufacturing waste materials into useable or marketable materials for use other than landfill disposal, combustion, or incineration.

Reuse. The return of a material into the economic stream for use.

Salvage. The recovery of construction and demolition building material and components from a building or site in order to increase the reuse or repurpose potential of these materials and decrease the amount of material being sent to the landfill. Salvaged material may be sold, donated, or reused on site.

P103 Construction and demolition material management.

P103.1 Collection containers. All sites where recyclable construction and demolition materials are generated and transported for recycling must provide a separate container for nonrecyclable materials pursuant to WAC 173-345-040.

P103.2 Salvage assessment. A salvage assessment shall be submitted prior to permit issuance. The salvage assessment shall identify the building components of an existing building that, if removed, have the potential to be reused. This assessment shall be signed by the owner and serve as an affidavit stating that the project shall be executed in compliance with the requirements of this code.

| EXCEPTION: | Projects that include only new construction. | | --- | --- |

P103.3 Waste diversion report. A waste diversion report shall be submitted prior to issuance of the Certificate of Occupancy. The waste diversion report shall identify the following:

1. Weight or volume of project-generated construction and demolition material;

2. Whether the material was disposed in a landfill or diverted;

3. The hauler of the material;

4. The receiving facility or location; and

5. The date materials were accepted by the receiving facility or location.

History

• Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 22-13-094, 23-12-103, and 23-20-023, § 51-50-4700, filed 6/14/22, 6/7/23, and 9/25/23, effective 3/15/24
• WSR 20-01-090, § 51-50-4700, filed 12/12/19, effective 7/1/20
• WSR 19-02-038, § 51-50-4700, filed 12/26/18, effective 7/1/19.

Wash. Admin. Code § 51-50-480000 2021 International Existing Building Code.

History

• Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 23-23-102, § 51-50-480000, filed 11/15/23, effective 3/16/24
• WSR 16-03-064, § 51-50-480000, filed 1/19/16, effective 7/1/16. Statutory Authority: RCW 19.27.031 and chapters 19.27 and 34.05 RCW. WSR 13-04-067, § 51-50-480000, filed 2/1/13, effective 7/1/13. Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 10-03-097, § 51-50-480000, filed 1/20/10, effective 7/1/10. Statutory Authority: RCW 19.27.074, 19.27.020, and chapters 70.92, 19.27, and 34.05 RCW. WSR 07-01-091, § 51-50-480000, filed 12/19/06, effective 7/1/07.

Wash. Admin. Code § 51-50-480101 Section 101—Scope and general requirements.

101.4.2 Buildings previously occupied. The legal occupancy of any building existing on the date of adoption of this code shall be permitted to continue without change, except as is specifically covered in this code, the International Fire Code, or as deemed necessary by the code official to mitigate an unsafe building. For the purpose of this section, "unsafe building" is not to be construed as mere lack of compliance with the current code.

101.6 Appendices. The code official is authorized to require rehabilitation and retrofit of buildings, structures, or individual structural members in accordance with the appendices of this code if such appendices have been individually adopted. Appendix A, Guidelines for the Seismic Retrofit of Existing Buildings, is hereby adopted as part of this code without any specific adoption by the local jurisdiction.

History

• Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 23-23-102, § 51-50-480101, filed 11/15/23, effective 3/16/24
• WSR 16-03-064, § 51-50-480101, filed 1/19/16, effective 7/1/16. Statutory Authority: RCW 19.27.031 and chapters 19.27 and 34.05 RCW. WSR 13-04-067, § 51-50-480101, filed 2/1/13, effective 7/1/13. Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 10-03-097, § 51-50-480101, filed 1/20/10, effective 7/1/10. Statutory Authority: RCW 19.27.074, 19.27.020, and chapters 70.92, 19.27, and 34.05 RCW. WSR 07-01-091, § 51-50-480101, filed 12/19/06, effective 7/1/07.

Wash. Admin. Code § 51-50-480102 Reserved.

History

• Statutory Authority: RCW 19.27.031, 19.27.074, and 19.27.540. WSR 23-02-073, 23-12-103, and 23-20-023, § 51-50-480102, filed 1/4/23, 6/7/23, and 9/25/23, effective 3/15/24. Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 16-03-064, § 51-50-480102, filed 1/19/16, effective 7/1/16. Statutory Authority: RCW 19.27.031 and chapters 19.27 and 34.05 RCW. WSR 13-04-067, § 51-50-480102, filed 2/1/13, effective 7/1/13. Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 10-03-097, § 51-50-480102, filed 1/20/10, effective 7/1/10. Statutory Authority: RCW 19.27.074, 19.27.020, and chapters 70.92, 19.27, and 34.05 RCW. WSR 07-01-091, § 51-50-480102, filed 12/19/06, effective 7/1/07.

Wash. Admin. Code § 51-50-480200 Section 201.3—Definitions.

201.3 Terms defined in other codes. Where terms are not defined in this code and are defined in the other International Codes and the Uniform Plumbing Code, such terms shall have the meanings ascribed to them in those codes.

202 General definitions.

ADULT FAMILY HOME. A dwelling, licensed by the Washington state department of social and health services, in which a person or persons provide personal care, special care, room and board to more than one but not more than six adults who are not related by blood or marriage to the person or persons providing the services. An existing adult family home may provide services to up to eight adults upon approval from the department of social and health services in accordance with RCW 70.128.066.

SUBSTANTIAL DAMAGE. For the purpose of determining compliance with the flood provisions of this code, damage of any origin sustained by a structure whereby the cost of restoring the structure to its before damaged condition would equal or exceed 50 percent of the value determined by one of the following methods:

1. Values developed for property tax assessment, adjusted to the approximate market value where the land is appraised separately from the structure.

2. Through a professional appraiser using estimates of a structure's actual cash value, including depreciation and improvements.

3. The latest building valuation data published by the International Code Council.

4. Qualified estimates based on the professional judgment of the building official. However, when the ratio falls between 40 and 60 percent, the building official may require the applicant to provide a detailed list of costs.

SUBSTANTIAL IMPROVEMENT. For the purpose of determining compliance with the flood provisions of this code, any repair, alteration, addition, or improvement of a building or structure, the cost of which equals or exceeds 50 percent of the value determined by one of the following methods:

1. Values developed for property tax assessment, adjusted to the approximate market value where the land is appraised separately from the structure.

2. Through a professional appraiser using estimates of a structure's actual cash value, including depreciation and improvements.

3. The latest building valuation data published by the International Code Council.

4. Qualified estimates based on the professional judgment of the building official. However, when the ratio falls between 40 and 60 percent, the building official may require the applicant to provide a detailed list of costs.

If the structure has sustained substantial damage, any repairs are considered substantial improvement regardless of the actual repair work performed. The term does not, however, include either of the following:

1. Any project for improvement of a building required to correct existing health, sanitary or safety code violations identified by the code official and that is the minimum necessary to ensure safe living conditions.

2. Any alteration of a historic structure, provided that the alteration will not preclude the structure's continued designation as a historic structure.

History

• Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 23-23-102, § 51-50-480200, filed 11/15/23, effective 3/16/24. Statutory Authority: RCW 19.27.031, 19.27.074, and 19.27.540. WSR 23-02-073, 23-12-103, and 23-20-023, § 51-50-480200, filed 1/4/23, 6/7/23, and 9/25/23, effective 3/15/24. Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 21-12-103, § 51-50-480200, filed 6/2/21, effective 7/3/21
• WSR 20-21-021, § 51-50-480200, filed 10/9/20, effective 11/9/20.

Wash. Admin. Code § 51-50-480302 Section 302—General provisions.

302.2 Additional codes. Alterations, repairs, additions and changes of occupancy to, or relocation of, existing buildings and structures shall comply with the provisions for alterations, repairs, additions and changes of occupancy or relocation, respectively, in this code and the Washington State Energy Code, International Fire Code, International Fuel Gas Code, International Mechanical Code, Uniform Plumbing Code, and International Residential Code. Where provisions of the other codes conflict with provisions of this code, the provisions of this code shall take precedence.

History

• Statutory Authority: RCW 19.27.031, 19.27.074, and 19.27.540. WSR 23-02-073, 23-12-103, and 23-20-023, § 51-50-480302, filed 1/4/23, 6/7/23, and 9/25/23, effective 3/15/24. Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 20-21-021, § 51-50-480302, filed 10/9/20, effective 11/9/20
• WSR 10-03-097, § 51-50-480302, filed 1/20/10, effective 7/1/10. Statutory Authority: RCW 19.27.074, 19.27.020, and chapters 70.92, 19.27, and 34.05 RCW. WSR 07-01-091, § 51-50-480302, filed 12/19/06, effective 7/1/07.

Wash. Admin. Code § 51-50-480305 Reserved.

History

• Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 10-03-097, § 51-50-480305, filed 1/20/10, effective 7/1/10. Statutory Authority: RCW 19.27.074, 19.27.020, and chapters 70.92, 19.27, and 34.05 RCW. WSR 07-01-091, § 51-50-480305, filed 12/19/06, effective 7/1/07.

Wash. Admin. Code § 51-50-480306 Section 306—Accessibility for existing buildings.

306.6 Additions. Provisions for new construction shall apply to additions. An addition that affects the accessibility to, or contains an area of, a primary function shall comply with the requirements in Section 306.7.1. Limited-use/limited-application elevators installed in accordance with ASME A17.1 shall be permitted as a component of an accessible route connecting the existing construction to the addition.

306.7.1 Alterations affecting an area containing a primary function. Where an alteration affects the accessibility to, or contains an area of primary function, the route to the primary function area shall be accessible. Toilet facilities and drinking fountains serving the area of primary function, including the route from the area of primary function to these facilities, shall be accessible. Priority shall be given to the improvements affecting the accessible route to the primary function area.

| EXCEPTIONS: | 1. The cumulative costs of providing the accessible route of travel, toilet facilities, and drinking fountains are not required to exceed 20 percent of the costs of the alterations affecting the area of primary function. | | --- | --- | | | 2. This provision does not apply to alterations limited solely to windows, hardware, operating controls, electrical outlets, and signs. | | | 3. This provision does not apply to alterations limited solely to mechanical systems, electrical systems, installation or alteration of fire protection systems and abatement of hazardous materials. | | | 4. This provision does not apply to alterations undertaken for the primary purpose of increasing the accessibility of a facility. | | | 5. This provision does not apply to altered areas limited to Type B dwelling and sleeping units. |

306.7.8 Platform lifts and limited-use/limited-application elevators. Vertical and inclined platform (wheelchair) lifts complying with ICC A117.1 and installed in accordance with ASME A18.1 shall be permitted as a component of an accessible route.

Limited-use/Limited-application elevators installed in accordance with ASME A17.1 shall be permitted as a component of an accessible route.

History

• Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 23-23-102, § 51-50-480306, filed 11/15/23, effective 3/16/24. Statutory Authority: RCW 19.27.031, 19.27.074, and 19.27.540. WSR 23-02-073, 23-12-103, and 23-20-023, § 51-50-480306, filed 1/4/23, 6/7/23, and 9/25/23, effective 3/15/24.

Wash. Admin. Code § 51-50-480307 Section 307—Reserved.

History

• Statutory Authority: RCW 19.27.031 and chapters 19.27 and 34.05 RCW. WSR 13-04-067, § 51-50-480307, filed 2/1/13, effective 7/1/13. Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 10-03-097, § 51-50-480307, filed 1/20/10, effective 7/1/10.

Wash. Admin. Code § 51-50-480401 Section 401—General.

401.2 Compliance. The work shall not make the building less complying than it was before the repair was undertaken. Work on nondamaged components that is necessary for the required repair of damaged components shall be considered part of the repair and shall not be subject to requirements for alterations.

401.4 Demolition and replacement. Where a building or structure is effectively demolished by damage or where the intended method of repair is demolition and replacement, the replaced building, including its replaced foundation, shall comply with requirements for new construction in the International Building Code.

| EXCEPTION: | Existing foundations are permitted to remain and be reused where approved by the code official. | | --- | --- |

History

• Statutory Authority: RCW 19.27.031, 19.27.074, and 19.27.540. WSR 23-02-073, 23-12-103, and 23-20-023, § 51-50-480401, filed 1/4/23, 6/7/23, and 9/25/23, effective 3/15/24.

Wash. Admin. Code § 51-50-480403 Reserved.

History

• Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 20-01-090, § 51-50-480403, filed 12/12/19, effective 7/1/20
• WSR 16-03-064, § 51-50-480403, filed 1/19/16, effective 7/1/16.

Wash. Admin. Code § 51-50-480405 Section 405—Structural.

405.1 General. Structural repairs shall be in compliance with this section and Section 401.2.

405.1.1 Structural concrete repairs. Repair of structural concrete is permitted to comply with ACI 562 Section 1.7, except where Section 405.2.2, 405.2.3, or 405.2.4.1 requires compliance with Section 304.3.

History

• Statutory Authority: RCW 19.27.031, 19.27.074, and 19.27.540. WSR 23-02-073, 23-12-103, and 23-20-023, § 51-50-480405, filed 1/4/23, 6/7/23, and 9/25/23, effective 3/15/24. Statutory Authority: RCW 19.27.031 and chapters 19.27 and 34.05 RCW. WSR 13-04-067, § 51-50-480405, filed 2/1/13, effective 7/1/13. Statutory Authority: RCW 19.27.074, 19.27.020, and chapters 70.92, 19.27, and 34.05 RCW. WSR 07-01-091, § 51-50-480405, filed 12/19/06, effective 7/1/07.

Wash. Admin. Code § 51-50-480407 Reserved.

History

• Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 20-01-090, § 51-50-480407, filed 12/12/19, effective 7/1/20
• WSR 16-03-064, § 51-50-480407, filed 1/19/16, effective 7/1/16. Statutory Authority: RCW 19.27.031 and chapters 19.27 and 34.05 RCW. WSR 13-04-067, § 51-50-480407, filed 2/1/13, effective 7/1/13.

Wash. Admin. Code § 51-50-480408 Section 408—Plumbing.

408.1 Materials. Plumbing materials and supplies shall not be used for repairs that are prohibited in the Uniform Plumbing Code.

History

• Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 20-21-021, § 51-50-480408, filed 10/9/20, effective 11/9/20.

Wash. Admin. Code § 51-50-480409 Reserved.

History

• Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 20-01-090, § 51-50-480409, filed 12/12/19, effective 7/1/20
• WSR 16-03-064, § 51-50-480409, filed 1/19/16, effective 7/1/16.

Wash. Admin. Code § 51-50-480410 Reserved.

History

• Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 20-01-090, § 51-50-480410, filed 12/12/19, effective 7/1/20
• WSR 16-03-064, § 51-50-480410, filed 1/19/16, effective 7/1/16.

Wash. Admin. Code § 51-50-480503 Section 503—Alterations.

503.13 Voluntary lateral force-resisting system alterations. Structural alterations that are intended exclusively to improve the lateral force resisting system and are not required by other sections of this code, shall not be required to meet the requirements of Section 1609 or 1613 of the International Building Code, provided that all of the following apply:

1. The capacity of existing structural systems to resist forces is not reduced.

2. New structural elements are detailed and connected to existing or new structural elements as required by the selected design criteria.

2.1 Where approved, new lateral force-resisting systems are permitted to be of a type designated as "Ordinary" or "Intermediate" where ASCE 7 Table 12.2-1 states these types of systems are not permitted provided that both of the following apply:

2.1.1 The selected design criteria is the International

Building Code.

2.1.2 The new "Ordinary" or "Intermediate" system provides deformation compatibility with the existing lateral force-resisting system.

3. New or relocated nonstructural elements are detailed and connected to existing or new structural elements as required by the International Building Code for new construction.

4. The alterations do not create a structural irregularity as defined in ASCE 7 or make an existing structural irregularity more severe.

503.19 Seismic requirements for alterations with increased occupant load of unreinforced masonry or hollow clay tile buildings. In addition to the requirements in Sections 503.4 through 503.11, alterations meeting all of the following conditions shall comply with the applicable requirements in Sections 503.19.1 through 503.19.4.

1. The occupant load of a building increases by more than 20 percent for occupancy groups A, I, E, R, M, B, H, or S used for storage of hazardous materials.

2. Buildings assigned to Seismic Design Category C, D, E, or F.

3. The building's structural system includes unreinforced masonry and hollow clay tile bearing walls.

Where there is a change of occupancy with the alteration, the most restrictive seismic requirements in accordance with Section 506 and this section shall apply. The cumulative effect of alterations compared with the original occupant load that have an increase in occupant load over time exceeding 20 percent shall comply with these provisions.

| EXCEPTIONS: | 1. A cumulative increase in the occupant load of less than 50 for occupancy categories A or I. | | --- | --- | | | 2. A cumulative increase in the occupant load of less than 25 for E occupancies. | | | 3. R-3 occupancies, and all other R occupancies with an increase of 5 dwelling or sleeping units or less. | | | 4. A cumulative increase in occupant load of less than 100 for occupancy categories M or B. | | | 5. A cumulative increase in the occupant load of less than 10 for H occupancies or S occupancies using hazardous materials. |

503.19.1 Large buildings. Buildings four or more stories or buildings more than 12,000 square feet shall be required to perform seismic evaluation in accordance with Section 304.3. Any lateral resisting elements shall be required to comply with design requirements for reduced seismic forces in accordance with Section 304.3.2 where found to be deficient.

503.19.2 Parapet bracing. Buildings with parapets constructed of unreinforced masonry where the parapet height to thickness ratio exceeds 1.5:1 shall be required to have parapets anchored, removed, or altered to resist out-of-plane seismic forces unless an evaluation demonstrates compliance of such items. Use of reduced seismic forces in accordance with Section 304.3.2 shall be permitted.

503.19.3 Floor and roof wall anchors. The alteration work shall include the installation of wall anchors at the floor and roof lines unless an evaluation demonstrates compliance of existing wall anchorage. Use of reduced seismic forces in accordance with Section 304.3.2 shall be permitted.

503.19.4 Bracing of partitions and nonstructural walls. Unreinforced masonry partitions and nonstructural walls within the alteration area and adjacent to egress paths from the alteration area shall be anchored, removed, or altered to resist out-of-plane seismic forces unless an evaluation demonstrates compliance of such items. Use of reduced seismic forces in accordance with Section 304.3.2 shall be permitted.

History

• Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 23-23-102, § 51-50-480503, filed 11/15/23, effective 3/16/24. Statutory Authority: RCW 19.27.031, 19.27.074, and 19.27.540. WSR 23-02-073, 23-12-103, and 23-20-023, § 51-50-480503, filed 1/4/23, 6/7/23, and 9/25/23, effective 3/15/24.

Wash. Admin. Code § 51-50-480505 Reserved.

History

• Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 16-03-064, § 51-50-480505, filed 1/19/16, effective 7/1/16. Statutory Authority: RCW 19.27.031 and chapters 19.27 and 34.05 RCW. WSR 13-04-067, § 51-50-480505, filed 2/1/13, effective 7/1/13.

Wash. Admin. Code § 51-50-480506 Section 506—Change of occupancy.

506.1.1 Change in the character of use. A change of occupancy with no change of occupancy classification shall not be made to any structure that will subject the structure to any special provisions of the applicable International Codes and Uniform Plumbing Code, without approval of the code official. Compliance shall be only as necessary to meet the specific provisions and is not intended to require the entire building be brought into compliance.

History

• Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 20-21-021, § 51-50-480506, filed 10/9/20, effective 11/9/20
• WSR 10-03-097, § 51-50-480506, filed 1/20/10, effective 7/1/10. Statutory Authority: RCW 19.27.074, 19.27.020, and chapters 70.92, 19.27, and 34.05 RCW. WSR 07-01-091, § 51-50-480506, filed 12/19/06, effective 7/1/07.

Wash. Admin. Code § 51-50-480603 Section 603—Alteration-Level 2.

603.1 Scope. Level 2 alterations include the addition or elimination of any door or window, the reconfiguration or extension of any system, or the installation of any additional equipment, and shall apply where the work is below the threshold of a Level 3 alteration.

| EXCEPTION: | The movement or addition of nonfixed and movable fixtures, cases, racks, counters and partitions not over 5 feet 9 inches (1753 mm) in height shall not be considered a Level 2 alteration. | | --- | --- |

History

• Statutory Authority: RCW 19.27.031, 19.27.074, and 19.27.540. WSR 23-02-073, 23-12-103, and 23-20-023, § 51-50-480603, filed 1/4/23, 6/7/23, and 9/25/23, effective 3/15/24.

Wash. Admin. Code § 51-50-480604 Section 604—Alteration-Level 3.

604.1 Scope. Level 3 alterations apply where one of the criteria is exceeded:

1. The work meets or exceeds the threshold of either substantial improvement or substantial damage; or

2. The alteration area exceeds 50 percent of the building area.

History

• Statutory Authority: RCW 19.27.031, 19.27.074, and 19.27.540. WSR 23-02-073, 23-12-103, and 23-20-023, § 51-50-480604, filed 1/4/23, 6/7/23, and 9/25/23, effective 3/15/24.

Wash. Admin. Code § 51-50-480607 Section 607—Reserved.

History

• Statutory Authority: RCW 19.27.031 and chapters 19.27 and 34.05 RCW. WSR 13-04-067, § 51-50-480607, filed 2/1/13, effective 7/1/13. Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 10-03-097, § 51-50-480607, filed 1/20/10, effective 7/1/10.

Wash. Admin. Code § 51-50-480702 Section 702—Building elements and materials.

702.7 Materials and methods. New work shall comply with the materials and methods requirements in the International Building Code, Washington State Energy Code, International Mechanical Code, and Uniform Plumbing Code, as applicable, that specify material standards, detail of installation and connection, joints, penetrations, and continuity of any element, component, or system in the building.

History

• Statutory Authority: RCW 19.27.031, 19.27.074, and 19.27.540. WSR 23-02-073, 23-12-103, and 23-20-023, § 51-50-480702, filed 1/4/23, 6/7/23, and 9/25/23, effective 3/15/24. Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 20-21-021, § 51-50-480702, filed 10/9/20, effective 11/9/20.

Wash. Admin. Code § 51-50-480704 Reserved.

History

• Statutory Authority: RCW 19.27.031, 19.27.074, and 19.27.540. WSR 23-02-073, 23-12-103, and 23-20-023, § 51-50-480704, filed 1/4/23, 6/7/23, and 9/25/23, effective 3/15/24. Statutory Authority: RCW 19.27.031 and chapters 19.27 and 34.05 RCW. WSR 13-04-067, § 51-50-480704, filed 2/1/13, effective 7/1/13. Statutory Authority: RCW 19.27.074, 19.27.020, and chapters 70.92, 19.27, and 34.05 RCW. WSR 07-01-091, § 51-50-480704, filed 12/19/06, effective 7/1/07.

Wash. Admin. Code § 51-50-480705 Reserved.

History

• Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 20-01-090, § 51-50-480705, filed 12/12/19, effective 7/1/20
• WSR 16-03-064, § 51-50-480705, filed 1/19/16, effective 7/1/16.

Wash. Admin. Code § 51-50-480707 Reserved.

History

• Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 16-03-064, § 51-50-480707, filed 1/19/16, effective 7/1/16. Statutory Authority: RCW 19.27.031 and chapters 19.27 and 34.05 RCW. WSR 13-04-067, § 51-50-480707, filed 2/1/13, effective 7/1/13.

Wash. Admin. Code § 51-50-480708 Energy conservation.

708.1 Minimum requirements. Level 1 alterations to existing buildings or structures shall comply with the Washington State Energy Code (chapter 51-11 WAC).

History

• Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 16-03-064, § 51-50-480708, filed 1/19/16, effective 7/1/16.

Wash. Admin. Code § 51-50-480711 Reserved.

History

• Statutory Authority: RCW 19.27.031, 19.27.074, and 19.27.540. WSR 23-02-073, 23-12-103, and 23-20-023, § 51-50-480711, filed 1/4/23, 6/7/23, and 9/25/23, effective 3/15/24. Statutory Authority: RCW 19.27.031 and chapters 19.27 and 34.05 RCW. WSR 13-04-067, § 51-50-480711, filed 2/1/13, effective 7/1/13. Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 10-03-097, § 51-50-480711, filed 1/20/10, effective 7/1/10.

Wash. Admin. Code § 51-50-480804 Reserved.

History

• Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 16-03-064, § 51-50-480804, filed 1/19/16, effective 7/1/16. Statutory Authority: RCW 19.27.031 and chapters 19.27 and 34.05 RCW. WSR 13-04-067, § 51-50-480804, filed 2/1/13, effective 7/1/13.

Wash. Admin. Code § 51-50-480805 Section 805—Structural.

805.4 Voluntary lateral force-resisting system alterations. Structural alterations that are intended exclusively to improve the lateral force resisting system and are not required by other sections of this code shall not be required to meet the requirements of Section 1609 or Section 1613 of the International Building Code, provided that the following conditions are met:

1. The capacity of existing structural systems to resist forces is not reduced.

2. New structural elements are detailed and connected to existing or new structural elements as required by the selected design criteria.

2.1 Where approved, new lateral force-resisting systems are permitted to be of a type designated as "Ordinary" or "Intermediate" where ASCE 7 Table 12.2-1 states these types of systems are not permitted provided that both of the following apply:

2.1.1 The selected design criteria is the International Building Code.

2.1.2 The new "Ordinary" or "Intermediate" system provides deformation compatibility with the existing lateral force-resisting system.

3. New or relocated nonstructural elements are detailed and connected to existing or new structural elements as required by the International Building Code for new construction.

4. The alterations do not create a structural irregularity as defined in ASCE 7 or make an existing structural irregularity more severe.

805.5 Seismic requirements for Level 2 alterations with increased occupant load of unreinforced masonry or hollow clay tile buildings. In addition to the requirements in Section 805.3, Level 2 alterations meeting all of the following conditions shall comply with the applicable requirements in Sections 805.5.1 through 805.5.4.

1. The occupant load of a building increases by more than 20 percent for occupancy groups A, I, E, R, M, B, H, or S used for storage of hazardous materials.

2. Buildings assigned to Seismic Design Category C, D, E, or F.

3. The building's structural system includes unreinforced masonry and hollow clay tile bearing walls.

Where there is a change of occupancy with the alteration, the most restrictive seismic requirements in accordance with Section 1006 and this section shall apply. The cumulative effect of alterations compared with the original occupant load that have an increase in occupant load over time exceeding 20 percent shall comply with these provisions.

| EXCEPTIONS: | 1. An increase in the occupant load of less than 50 for occupancy categories A or I. | | --- | --- | | | 2. An increase in the occupant load of less than 25 for E occupancies. | | | 3. R-3 occupancies, and all other R occupancies with an increase of 5 dwelling or sleeping units or less. | | | 4. An increase in occupant load of less than 100 for occupancy categories M or B. | | | 5. A cumulative increase in the occupant load of less than 10 for H occupancies or S occupancies using hazardous materials. |

805.5.1 Large buildings. Buildings four or more stories or buildings more than 12,000 square feet shall be required to perform seismic evaluation in accordance with Section 304.3. Any lateral resisting elements shall be required to comply with design requirements for reduced seismic forces in accordance with Section 304.3.2 where found to be deficient.

805.5.2 Parapet bracing. Buildings with parapets constructed of unreinforced masonry where the parapet height to thickness ratio exceeds 1.5:1 shall be required to have parapets anchored, removed or altered to resist out-of-plane seismic forces, unless an evaluation demonstrates compliance of such items. Use of reduced seismic forces in accordance with Section 304.3.2 shall be permitted.

805.5.3 Floor and roof wall anchors. The alteration shall include the installation of wall anchors at the floor and roof lines, unless an evaluation demonstrates compliance of existing wall anchorage. Use of reduced seismic forces in accordance with Section 304.3.2 shall be permitted.

805.5.4 Bracing of partitions and nonstructural walls. Unreinforced masonry partitions and nonstructural walls within the work area and adjacent to egress paths from the alteration area shall be anchored, removed or altered to resist out-of-plane seismic forces, unless an evaluation demonstrates compliance of such items. Use of reduced seismic forces in accordance with Section 304.3.2 shall be permitted.

History

• Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 23-23-102, § 51-50-480805, filed 11/15/23, effective 3/16/24. Statutory Authority: RCW 19.27.031, 19.27.074, and 19.27.540. WSR 23-02-073, 23-12-103, and 23-20-023, § 51-50-480805, filed 1/4/23, 6/7/23, and 9/25/23, effective 3/15/24.

Wash. Admin. Code § 51-50-480807 Reserved.

History

• Statutory Authority: RCW 19.27.031, 19.27.074, and 19.27.540. WSR 23-02-073, 23-12-103, and 23-20-023, § 51-50-480807, filed 1/4/23, 6/7/23, and 9/25/23, effective 3/15/24. Statutory Authority: RCW 19.27.031 and chapters 19.27 and 34.05 RCW. WSR 13-04-067, § 51-50-480807, filed 2/1/13, effective 7/1/13. Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 10-03-097, § 51-50-480807, filed 1/20/10, effective 7/1/10. Statutory Authority: RCW 19.27.074, 19.27.020, and chapters 70.92, 19.27, and 34.05 RCW. WSR 07-01-091, § 51-50-480807, filed 12/19/06, effective 7/1/07.

Wash. Admin. Code § 51-50-480808 Reserved.

History

• Statutory Authority: RCW 19.27.031, 19.27.074, and 19.27.540. WSR 23-02-073, 23-12-103, and 23-20-023, § 51-50-480808, filed 1/4/23, 6/7/23, and 9/25/23, effective 3/15/24. Statutory Authority: RCW 19.27.031 and chapters 19.27 and 34.05 RCW. WSR 13-04-067, § 51-50-480808, filed 2/1/13, effective 7/1/13. Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 10-03-097, § 51-50-480808, filed 1/20/10, effective 7/1/10.

Wash. Admin. Code § 51-50-480809 Section 809—Energy conservation.

809.1 Minimumrequirements. Level 2 alterations to existing buildings or structures shall comply with the Washington State Energy Code (chapter 51-11C WAC).

History

• Statutory Authority: RCW 19.27.031, 19.27.074, and 19.27.540. WSR 23-02-073, 23-12-103, and 23-20-023, § 51-50-480809, filed 1/4/23, 6/7/23, and 9/25/23, effective 3/15/24. Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 20-21-021, § 51-50-480809, filed 10/9/20, effective 11/9/20.

Wash. Admin. Code § 51-50-480810 Reserved.

History

• Statutory Authority: RCW 19.27.031, 19.27.074, and 19.27.540. WSR 23-02-073, 23-12-103, and 23-20-023, § 51-50-480810, filed 1/4/23, 6/7/23, and 9/25/23, effective 3/15/24. Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 21-06-035, § 51-50-480810, filed 2/23/21, effective 3/26/21.

Wash. Admin. Code § 51-50-480811 Reserved.

History

• Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 21-06-035, § 51-50-480811, filed 2/23/21, effective 3/26/21. Statutory Authority: RCW 19.27.031 and chapters 19.27 and 34.05 RCW. WSR 13-04-067, § 51-50-480811, filed 2/1/13, effective 7/1/13.

Wash. Admin. Code § 51-50-480906 Reserved.

History

• Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 20-01-090, § 51-50-480906, filed 12/12/19, effective 7/1/20
• WSR 16-03-064, § 51-50-480906, filed 1/19/16, effective 7/1/16.

Wash. Admin. Code § 51-50-480907 Energy conservation.

907.1 Minimum requirements. Level 3 alterations to existing buildings or structures shall comply with the Washington State Energy Code (chapter 51-11C WAC).

History

• Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 21-06-035, § 51-50-480907, filed 2/23/21, effective 3/26/21
• WSR 20-01-090, § 51-50-480907, filed 12/12/19, effective 7/1/20
• WSR 16-03-064, § 51-50-480907, filed 1/19/16, effective 7/1/16. Statutory Authority: RCW 19.27.031 and chapters 19.27 and 34.05 RCW. WSR 13-04-067, § 51-50-480907, filed 2/1/13, effective 7/1/13.

Wash. Admin. Code § 51-50-480908 Reserved.

History

• Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 21-06-035, § 51-50-480908, filed 2/23/21, effective 3/26/21. Statutory Authority: RCW 19.27.031 and chapters 19.27 and 34.05 RCW. WSR 13-04-067, § 51-50-480908, filed 2/1/13, effective 7/1/13.

Wash. Admin. Code § 51-50-480912 Reserved.

History

• Statutory Authority: RCW 19.27.031, 19.27.074, and 19.27.540. WSR 23-02-073, 23-12-103, and 23-20-023, § 51-50-480912, filed 1/4/23, 6/7/23, and 9/25/23, effective 3/15/24. Statutory Authority: RCW 19.27.031 and chapters 19.27 and 34.05 RCW. WSR 13-04-067, § 51-50-480912, filed 2/1/13, effective 7/1/13. Statutory Authority: RCW 19.27.074, 19.27.020, and chapters 70.92, 19.27, and 34.05 RCW. WSR 07-01-091, § 51-50-480912, filed 12/19/06, effective 7/1/07.

Wash. Admin. Code § 51-50-481002 Section 1002—Special use and occupancy.

1002.3 Change of occupancy in health care. Where a change of occupancy occurs to a Group I-2 or I-1 facility, the work area with the change of occupancy shall comply with the International Building Code.

The International Building Code shall apply to Group I-1, Condition 2, for licensure as an assisted living facility under chapter 388-78A WAC or residential treatment facility under chapter 246-337 WAC.

| EXCEPTION: | A change in use or occupancy in the following cases shall not be required to meet the International Building Code: | | --- | --- | | | 1. Group I-2, Condition 2 to Group I-2, Condition 1. | | | 2. Group I-2 to ambulatory health care. | | | 3. Group I-2 to Group I-1. | | | 4. Group I-1, Condition 2 to Group I-1, Condition 1. |

History

• Statutory Authority: RCW 19.27.031, 19.27.074, and 19.27.540. WSR 23-02-073, 23-12-103, and 23-20-023, § 51-50-481002, filed 1/4/23, 6/7/23, and 9/25/23, effective 3/15/24. Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 20-01-090, § 51-50-481002, filed 12/12/19, effective 7/1/20.

Wash. Admin. Code § 51-50-481009 Section 1009—Plumbing.

1009.1 Increased demand. Where the occupancy of an existing building or part of an existing building is changed such that the new occupancy is subject to increased or different plumbing fixture requirements or to increased water supply requirements in accordance with the Uniform Plumbing Code, the new occupancy shall comply with the intent of the respective Uniform Plumbing Code provisions.

| EXCEPTION: | Only where the occupant load of the story is increased by more than 20 percent, plumbing fixtures for the story shall be provided in quantities specified in Chapter 29 of the International Building Code, based on the increased occupant load. | | --- | --- |

1009.2 Food-handling occupancies. If the new occupancy is a food-handling establishment, all existing sanitary waste lines above the food or drink preparation or storage areas shall be panned or otherwise protected to prevent leaking pipes or condensation on pipes from contaminating food or drink. New drainage lines shall not be installed above such areas and shall be protected in accordance with the Uniform Plumbing Code.

1009.3 Interceptor required. If the new occupancy will produce grease or oil-laden wastes, interceptors shall be provided as required in the Uniform Plumbing Code.

1009.5 Group I-2. If the occupancy group is changed to Group I-2, the plumbing system shall comply with the applicable requirements of the Uniform Plumbing Code.

History

• Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 23-23-102, § 51-50-481009, filed 11/15/23, effective 3/16/24
• WSR 20-21-021, § 51-50-481009, filed 10/9/20, effective 11/9/20.

Wash. Admin. Code § 51-50-481012 Reserved.

History

• Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 16-03-064, § 51-50-481012, filed 1/19/16, effective 7/1/16. Statutory Authority: RCW 19.27.031 and chapters 19.27 and 34.05 RCW. WSR 13-04-067, § 51-50-481012, filed 2/1/13, effective 7/1/13.

Wash. Admin. Code § 51-50-481101 Section 1101—General.

1101.1 Scope. An addition to a building or structure shall comply with the International Codes and Uniform Plumbing Code as adopted for new construction without requiring the existing building or structure to comply with any requirements of those codes or of these provisions, except as required by this chapter. Where an addition impacts the existing building or structure, that portion shall comply with this code.

History

• Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 23-23-102, § 51-50-481101, filed 11/15/23, effective 3/16/24
• WSR 20-21-021, § 51-50-481101, filed 10/9/20, effective 11/9/20. Statutory Authority: RCW 19.27.031 and chapters 19.27 and 34.05 RCW. WSR 13-04-067, § 51-50-481101, filed 2/1/13, effective 7/1/13. Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 10-03-097, § 51-50-481101, filed 1/20/10, effective 7/1/10. Statutory Authority: RCW 19.27.074, 19.27.020, and chapters 70.92, 19.27, and 34.05 RCW. WSR 07-01-091, § 51-50-481101, filed 12/19/06, effective 7/1/07.

Wash. Admin. Code § 51-50-481102 Reserved.

History

• Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 10-03-097, § 51-50-481102, filed 1/20/10, effective 7/1/10. Statutory Authority: RCW 19.27.074, 19.27.020, and chapters 70.92, 19.27, and 34.05 RCW. WSR 07-01-091, § 51-50-481102, filed 12/19/06, effective 7/1/07.

Wash. Admin. Code § 51-50-481103 Reserved.

History

• Statutory Authority: RCW 19.27.031, 19.27.074, and 19.27.540. WSR 23-02-073, 23-12-103, and 23-20-023, § 51-50-481103, filed 1/4/23, 6/7/23, and 9/25/23, effective 3/15/24. Statutory Authority: RCW 19.27.031 and chapters 19.27 and 34.05 RCW. WSR 13-04-067, § 51-50-481103, filed 2/1/13, effective 7/1/13. Statutory Authority: RCW 19.27.074, 19.27.020, and chapters 70.92, 19.27, and 34.05 RCW. WSR 07-01-091, § 51-50-481103, filed 12/19/06, effective 7/1/07.

Wash. Admin. Code § 51-50-481104 Reserved.

History

• Statutory Authority: RCW 19.27.031 and chapters 19.27 and 34.05 RCW. WSR 13-04-067, § 51-50-481104, filed 2/1/13, effective 7/1/13. Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 10-03-097, § 51-50-481104, filed 1/20/10, effective 7/1/10. Statutory Authority: RCW 19.27.074, 19.27.020, and chapters 70.92, 19.27, and 34.05 RCW. WSR 07-01-091, § 51-50-481104, filed 12/19/06, effective 7/1/07.

Wash. Admin. Code § 51-50-481105 Reserved.

History

• Statutory Authority: RCW 19.27.031, 19.27.074, and 19.27.540. WSR 23-02-073, 23-12-103, and 23-20-023, § 51-50-481105, filed 1/4/23, 6/7/23, and 9/25/23, effective 3/15/24. Statutory Authority: RCW 19.27.031 and chapters 19.27 and 34.05 RCW. WSR 13-04-067, § 51-50-481105, filed 2/1/13, effective 7/1/13. Statutory Authority: RCW 19.27.074, 19.27.020, and chapters 70.92, 19.27, and 34.05 RCW. WSR 07-01-091, § 51-50-481105, filed 12/19/06, effective 7/1/07.

Wash. Admin. Code § 51-50-481106 Reserved.

History

• Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 10-03-097, § 51-50-481106, filed 1/20/10, effective 7/1/10. Statutory Authority: RCW 19.27.074, 19.27.020, and chapters 70.92, 19.27, and 34.05 RCW. WSR 07-01-091, § 51-50-481106, filed 12/19/06, effective 7/1/07.

Wash. Admin. Code § 51-50-481201 Section 1201—Historic buildings—General.

1201.1 Scope. This chapter is intended to provide means for the preservation of historic buildings. It is the purpose of this chapter to encourage cost-effective preservation of original or restored architectural elements and features and to provide a historic building that will result in a reasonable degree of safety, based on accepted life and fire safety practices, compared to the existing building. Historic buildings shall comply with the provisions of this chapter relating to their repair, alteration, relocation and change of occupancy.

SECTION 1202—Reserved.

History

• Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 23-23-102, § 51-50-481201, filed 11/15/23, effective 3/16/24. Statutory Authority: RCW 19.27.031, 19.27.074, and 19.27.540. WSR 23-02-073, 23-12-103, and 23-20-023, § 51-50-481201, filed 1/4/23, 6/7/23, and 9/25/23, effective 3/15/24. Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 16-03-064, § 51-50-481201, filed 1/19/16, effective 7/1/16. Statutory Authority: RCW 19.27.031 and chapters 19.27 and 34.05 RCW. WSR 13-04-067, § 51-50-481201, filed 2/1/13, effective 7/1/13. Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 10-03-097, § 51-50-481201, filed 1/20/10, effective 7/1/10.

Wash. Admin. Code § 51-50-481203 Fire safety.

1203.9 Stairway railings. Historically significant stairways shall be accepted without complying with the handrail and guard requirements. Existing handrails and guards at all stairs shall be permitted to remain, provided they are not structurally dangerous.

History

• Statutory Authority: RCW 19.27.031 and chapters 19.27 and 34.05 RCW. WSR 13-04-067, § 51-50-481203, filed 2/1/13, effective 7/1/13.

Wash. Admin. Code § 51-50-481204 Reserved.

| | | | --- | --- |

History

• Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 20-21-021, § 51-50-481204, filed 10/9/20, effective 11/9/20
• WSR 20-01-090, § 51-50-481204, filed 12/12/19, effective 7/1/20. Statutory Authority: RCW 19.27.031 and chapters 19.27 and 34.05 RCW. WSR 13-04-067, § 51-50-481204, filed 2/1/13, effective 7/1/13.

Wash. Admin. Code § 51-50-481205 Reserved.

History

• Statutory Authority: RCW 19.27.031, 19.27.074, and 19.27.540. WSR 23-02-073, 23-12-103, and 23-20-023, § 51-50-481205, filed 1/4/23, 6/7/23, and 9/25/23, effective 3/15/24. Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 20-01-090, § 51-50-481205, filed 12/12/19, effective 7/1/20. Statutory Authority: RCW 19.27.031 and chapters 19.27 and 34.05 RCW. WSR 13-04-067, § 51-50-481205, filed 2/1/13, effective 7/1/13.

Wash. Admin. Code § 51-50-481301 Reserved.

History

• Statutory Authority: RCW 19.27.031, 19.27.074, and 19.27.540. WSR 23-02-073, 23-12-103, and 23-20-023, § 51-50-481301, filed 1/4/23, 6/7/23, and 9/25/23, effective 3/15/24. Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 16-03-064, § 51-50-481301, filed 1/19/16, effective 7/1/16. Statutory Authority: RCW 19.27.031 and chapters 19.27 and 34.05 RCW. WSR 13-04-067, § 51-50-481301, filed 2/1/13, effective 7/1/13. Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 10-03-097, § 51-50-481301, filed 1/20/10, effective 7/1/10. Statutory Authority: RCW 19.27.074, 19.27.020, and chapters 70.92, 19.27, and 34.05 RCW. WSR 07-01-091, § 51-50-481301, filed 12/19/06, effective 7/1/07.

Wash. Admin. Code § 51-50-481302 Reserved.

History

• Statutory Authority: RCW 19.27.031, 19.27.074, and 19.27.540. WSR 23-02-073, 23-12-103, and 23-20-023, § 51-50-481302, filed 1/4/23, 6/7/23, and 9/25/23, effective 3/15/24. Statutory Authority: RCW 19.27.031 and chapters 19.27 and 34.05 RCW. WSR 13-04-067, § 51-50-481302, filed 2/1/13, effective 7/1/13.

Wash. Admin. Code § 51-50-481401 Relocated or moved buildings—General.

1401.2 Conformance. Buildings or structures moved into or within the jurisdiction shall comply with the provisions of this code, the International Residential Code (chapter 51-51 WAC), the International Mechanical Code (chapter 51-52 WAC), the International Fire Code (chapter 51-54A WAC), the Uniform Plumbing Code (chapter 51-56 WAC), the Washington State Energy Code - Commercial (chapter 51-11C WAC), and the Washington State Energy Code - Residential (chapter 51-11R WAC) for new buildings or structures.

| EXCEPTION: | Group R-3 buildings or structures are not required to comply if: | | --- | --- | | | 1. The original occupancy classification is not changed; and | | | 2. The original building is not substantially remodeled or rehabilitated. |

For the purposes of this section, a building shall be considered to be substantially remodeled when the costs of remodeling exceed 60 percent of the value of the building exclusive of the costs relating to preparation, construction, demolition or renovation of foundations.

History

• Statutory Authority: RCW 19.27.031, 19.27.074, and 19.27.540. WSR 23-02-073, 23-12-103, and 23-20-023, § 51-50-481401, filed 1/4/23, 6/7/23, and 9/25/23, effective 3/15/24.

Wash. Admin. Code § 51-50-481402 Section 1402—Requirements.

This section is not adopted.

History

• Statutory Authority: RCW 19.27.031, 19.27.074, and 19.27.540. WSR 23-02-073, 23-12-103, and 23-20-023, § 51-50-481402, filed 1/4/23, 6/7/23, and 9/25/23, effective 3/15/24.

Wash. Admin. Code § 51-50-481500 Section 1501—General.

1501.7 Facilities required. Sanitary facilities shall be provided during construction or demolition activities in accordance with the Uniform Plumbing Code.

History

• Statutory Authority: RCW 19.27.031, 19.27.074, and 19.27.540. WSR 23-02-073, 23-12-103, and 23-20-023, § 51-50-481500, filed 1/4/23, 6/7/23, and 9/25/23, effective 3/15/24. Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 20-21-021, § 51-50-481500, filed 10/9/20, effective 11/9/20
• WSR 10-03-097, § 51-50-481500, filed 1/20/10, effective 7/1/10. Statutory Authority: RCW 19.27.074, 19.27.020, and chapters 70.92, 19.27, and 34.05 RCW. WSR 07-01-091, § 51-50-481500, filed 12/19/06, effective 7/1/07.

Wash. Admin. Code § 51-50-481600 Chapter 16—Referenced standards.

Add the reference standards as follows:

| Standard reference number | Title | Referenced in code section number | | --- | --- | --- | | ACI 562-21 | Assessment, Repair, and Rehabilitation of Existing Concrete Structures | 405.1.1 |

History

• Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 23-23-102, § 51-50-481600, filed 11/15/23, effective 3/16/24.

Wash. Admin. Code § 51-50-490000 Reserved.

History

• Statutory Authority: RCW 19.27.031, 19.27.074, and 19.27.540. WSR 23-02-073, 23-12-103, and 23-20-023, § 51-50-490000, filed 1/4/23, 6/7/23, and 9/25/23, effective 3/15/24. Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 16-03-064, § 51-50-490000, filed 1/19/16, effective 7/1/16.

Chapter 51-51 State Building Code adoption and amendment of the 2021 edition of the International Residential Code.

Wash. Admin. Code § 51-51-001 Authority.

These rules are adopted under the authority of chapter 19.27 RCW.

History

• Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 04-01-109, § 51-51-001, filed 12/17/03, effective 7/1/04.

Wash. Admin. Code § 51-51-002 Purpose.

The purpose of these rules is to implement the provisions of chapter 19.27 RCW, which provides that the state building code council shall maintain the State Building Code in a status which is consistent with the purpose as set forth in RCW 19.27.020. In maintaining the codes the council shall regularly review updated versions of the codes adopted under the act, and other pertinent information, and shall amend the codes as deemed appropriate by the council.

History

• Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 04-01-109, § 51-51-002, filed 12/17/03, effective 7/1/04.

Wash. Admin. Code § 51-51-003 International Residential Code.

The 2021 edition of the International Residential Code as published by the International Code Council is hereby adopted by reference with the following additions, deletions, and exceptions: Provided that chapters 11 and 25 through 43 of this code are not adopted. Energy Code is regulated by chapter 51-11R WAC; Plumbing Code is regulated by chapter 51-56 WAC; Electrical Code is regulated by chapter 296-46B WAC or Electrical Code as adopted by the local jurisdiction. Appendix AF, Radon Control Methods, Appendix AQ, Tiny Homes, and Appendix AWU, Dwelling Unit Fire Sprinkler Systems, are included in adoption of the International Residential Code.

History

• Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 23-23-104, § 51-51-003, filed 11/15/23, effective 3/16/24
• WSR 23-02-058, 23-12-104, and 23-20-024, § 51-51-003, filed 1/3/23, 6/7/23, and 9/25/23, effective 3/15/24
• WSR 20-03-023, § 51-51-003, filed 1/6/20, effective 7/1/20
• WSR 16-03-025, § 51-51-003, filed 1/11/16, effective 7/1/16. Statutory Authority: RCW 19.27.031 and chapters 19.27 and 34.05 RCW. WSR 13-04-068, § 51-51-003, filed 2/1/13, effective 7/1/13. Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 10-03-098, § 51-51-003, filed 1/20/10, effective 7/1/10. Statutory Authority: RCW 19.27.074, 19.27.020, and chapters 19.27 and 34.05 RCW. WSR 07-01-090, § 51-51-003, filed 12/19/06, effective 7/1/07. Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 04-01-109, § 51-51-003, filed 12/17/03, effective 7/1/04.

Wash. Admin. Code § 51-51-007 Exceptions.

The exceptions and amendments to the International Residential Code contained in the provisions of chapter 19.27 RCW shall apply in case of conflict with any of the provisions of these rules.

The provisions of this code do not apply to temporary growing structures used solely for the commercial production of horticultural plants including ornamental plants, flowers, vegetables, and fruits. "Temporary growing structure" means a structure that has the sides and roof covered with polyethylene, polyvinyl, or similar flexible synthetic material and is used to provide plants with either frost protection or increased heat retention. A temporary growing structure is not considered a building for purposes of this code.

The provisions of this code do not apply to the construction, alteration, or repair of temporary worker housing except as provided by rule adopted under chapter 70.114A RCW or chapter 37, Laws of 1998 (SB 6168). "Temporary worker housing" means a place, area, or piece of land where sleeping places or housing sites are provided by an employer for his or her employees or by another person, including a temporary worker housing operator, who is providing such accommodations for employees, for temporary, seasonal occupancy, and includes "labor camps" under RCW 70.54.110.

Codes referenced which are not adopted through RCW 19.27.031 or chapter 19.27A RCW shall not apply unless specifically adopted by the authority having jurisdiction.

The standards for liquefied petroleum gas installations shall be NFPA 58 (Liquefied Petroleum Gas Code) and NFPA 54 (National Fuel Gas Code). All other fuel gas installations shall be regulated by the International Mechanical Code and International Fuel Gas Code.

History

• Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 04-01-109, § 51-51-007, filed 12/17/03, effective 7/1/04.

Wash. Admin. Code § 51-51-008 Implementation.

The International Residential Code adopted by chapter 51-51 WAC shall become effective in all counties and cities of this state on March 15, 2024.

History

• Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 23-23-104, § 51-51-008, filed 11/15/23, effective 3/16/24
• WSR 23-02-058, 23-12-104, and 23-20-024, § 51-51-008, filed 1/3/23, 6/7/23, and 9/25/23, effective 3/15/24
• WSR 21-11-066, § 51-51-008, filed 5/14/21, effective 6/14/21
• WSR 20-03-023, § 51-51-008, filed 1/6/20, effective 7/1/20
• WSR 16-03-025, § 51-51-008, filed 1/11/16, effective 7/1/16. Statutory Authority: RCW 19.27.031 and chapters 19.27 and 34.05 RCW. WSR 13-04-068, § 51-51-008, filed 2/1/13, effective 7/1/13. Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 10-03-098, § 51-51-008, filed 1/20/10, effective 7/1/10. Statutory Authority: RCW 19.27.074, 19.27.020, and chapters 19.27 and 34.05 RCW. WSR 07-01-090, § 51-51-008, filed 12/19/06, effective 7/1/07. Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 04-01-109, § 51-51-008, filed 12/17/03, effective 7/1/04.

Wash. Admin. Code § 51-51-01010 Section R101—Scope and general requirements.

R101.2 Scope. The provisions of the International Residential Code for One- and Two-Family Dwellings shall apply to the construction, alteration, movement, enlargement, replacement, repair, equipment, use and occupancy, location, removal and demolition of detached one- and two-family dwellings, adult family homes, and townhouses not more than three stories above grade plane in height with a separate means of egress and their accessory structures not more than three stories above grade plane in height.

| EXCEPTIONS: | 1. Live/work units located in townhouses and complying with the requirements of Section 508.5 of the International Building Code shall be permitted to be constructed in accordance with the International Residential Code for One- and Two-Family Dwellings. An automatic sprinkler system required by Section 508.5.7 of the International Building Code where constructed under the International Residential Code for One- and Two-Family Dwellings shall conform to Appendix AWU. | | --- | --- | | | 2. Owner-occupied lodging houses with one or two guestrooms shall be permitted to be constructed in accordance with the International Residential Code forOne- and Two-Family Dwellings. | | | 3. Owner-occupied lodging homes with three to five guestrooms shall be permitted to be constructed in accordance with the International Residential Code for One- and Two-Family Dwellings where equipped with an automatic fire sprinkler system in accordance with Appendix AWU. | | | 4. A care facility with five or fewer persons receiving custodial care within a dwelling unit shall be permitted to be constructed in accordance with the International Residential Code for One- and Two-Family Dwellings where equipped with an automatic fire sprinkler system in accordance with Appendix AWU. | | | 5. A care facility with five or fewer persons receiving medical care within a dwelling unit shall be permitted to be constructed in accordance with the International Residential Code for One- and Two-Family Dwellings where equipped with an automatic fire sprinkler system in accordance with Appendix AWU. | | | 6. A care facility with five or fewer persons receiving care that are within a single-family dwelling shall be permitted to be constructed in accordance with the International Residential Code for One- and Two-Family Dwellings where equipped with an automatic fire sprinkler system in accordance with Appendix AWU. |

History

• Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 23-23-104, § 51-51-01010, filed 11/15/23, effective 3/16/24
• WSR 23-02-058, 23-12-104, and 23-20-024, § 51-51-01010, filed 1/3/23, 6/7/23, and 9/25/23, effective 3/15/24
• WSR 20-03-023, § 51-51-01010, filed 1/6/20, effective 7/1/20
• WSR 16-03-025, § 51-51-01010, filed 1/11/16, effective 7/1/16.

Wash. Admin. Code § 51-51-0102 Section R102—Applicability.

R102.5 Appendices. Provisions in the appendices shall not apply unless specifically referenced in the adopting ordinance. An appendix adopted by a local jurisdiction shall not be effective unless approved by the state building code council pursuant to RCW 19.27.060 (1)(a).

| EXCEPTIONS: | 1. The state building code council has determined that a local ordinance providing specifications for light straw-clay or strawbale construction, requiring a solar-ready zone, requiring fire sprinklers, or addressing construction and demolition material management or building deconstruction in accordance with Appendix AR, AS, AT, AWV, AWY, or AWZ of this code may be adopted by any local government upon notification of the council. | | --- | --- | | | 2. Appendix AF, Radon Control Methods, Appendix AQ, Tiny Homes, and Appendix AWU, Dwelling Unit Fire Sprinkler Systems, are included in adoption of the International Residential Code. |

R102.7.1 Additions, alterations, change of use, repairs, or relocations.Additions, alterations, repairs, or relocations shall be permitted to conform to the requirements of the provisions of Chapter 45 or shall conform to the requirements for new structure without requiring the existing structure to comply with the requirements of this code, unless otherwise stated. Additions, alterations, repairs, and relocations shall not cause an existing structure to become less compliant with the provisions of this code than the existing building or structure was prior to the addition, alteration, repair, or relocation. Where additions, alterations, or changes of use to an existing structure result in a use or occupancy, height, or means of egress outside the scope of this code, the building shall comply with the International Existing Building Code.

| EXCEPTIONS: | 1. Additions with less than 500 square feet of conditioned floor area are exempt from the requirements for Whole-House Ventilation Systems, Section M1505.4. | | --- | --- | | | 2. Additions or alterations to existing buildings which do not require the construction of foundations, crawlspaces, slabs or basements shall not be required to meet the requirements for radon protection in Section R332.1 and Appendix AF. |

R102.7.2 Moved buildings. Buildings or structures moved into or within a jurisdiction shall comply with the provisions of this code, the International Building Code (chapter 51-50 WAC), the International Mechanical Code (chapter 51-52 WAC), the International Fire Code (chapter 51-54A WAC), the Uniform Plumbing Code and Standards (chapter 51-56 WAC), and the Washington State Energy Code (chapter 51-11R WAC) for new buildings or structures.

| EXCEPTION: | Group R-3 buildings or structures are not required to comply if: | | --- | --- | | | 1. The original occupancy classification is not changed; and | | | 2. The original building is not substantially remodeled or rehabilitated. For the purposes of this section a building shall be considered to be substantially remodeled when the costs of remodeling exceed 60 percent of the value of the building exclusive of the costs relating to preparation, construction, demolition or renovation of foundations. |

History

• Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 23-23-104, § 51-51-0102, filed 11/15/23, effective 3/16/24
• WSR 23-02-058, 23-12-104, and 23-20-024, § 51-51-0102, filed 1/3/23, 6/7/23, and 9/25/23, effective 3/15/24
• WSR 20-21-041, § 51-51-0102, filed 10/13/20, effective 11/13/20
• WSR 16-03-025, § 51-51-0102, filed 1/11/16, effective 7/1/16. Statutory Authority: RCW 19.27.031 and chapters 19.27 and 34.05 RCW. WSR 13-04-068, § 51-51-0102, filed 2/1/13, effective 7/1/13. Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 10-03-098, § 51-51-0102, filed 1/20/10, effective 7/1/10. Statutory Authority: RCW 19.27.074, 19.27.020, and chapters 19.27 and 34.05 RCW. WSR 07-01-090, § 51-51-0102, filed 12/19/06, effective 7/1/07. Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 04-01-109, § 51-51-0102, filed 12/17/03, effective 7/1/04.

Wash. Admin. Code § 51-51-0106 Reserved.

History

• Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 23-02-058, 23-12-104, and 23-20-024, § 51-51-0106, filed 1/3/23, 6/7/23, and 9/25/23, effective 3/15/24
• WSR 20-03-023, § 51-51-0106, filed 1/6/20, effective 7/1/20.

Wash. Admin. Code § 51-51-0202 Section R202—Definitions.

ADULT FAMILY HOME. A dwelling, licensed by the state of Washington department of social and health services, in which a person or persons provide personal care, special care, room and board to more than one but not more than six adults who are not related by blood or marriage to the person or persons providing the services. An existing adult family home may provide services to up to eight adults upon approval from the department of social and health services in accordance with RCW 70.128.066.

BUILDING. Any one- or two-family dwelling or townhouse, or portion thereof used or intended to be used for human habitation, for living, sleeping, cooking or eating purposes, or any combination thereof, or any accessory structure.

BUILDING, EXISTING. A building or structure erected prior to the adoption of this code, or one that has passed a final inspection.

CHILD CARE, FAMILY HOME. A child care facility, licensed by Washington state, located in the dwelling of the person or persons under whose direct care and supervision the child is placed, for the care of 16 or fewer children, including children who reside at the home.

CHILD DAY CARE, shall, for the purposes of these regulations, mean the care of children during any period of a 24-hour day.

CONDITIONED SPACE. An area, room or space that is enclosed within the building thermal envelope and that is directly or indirectly heated or cooled. Spaces are indirectly heated or cooled where they communicate through openings with conditioned spaces, where they are separated from conditioned spaces by uninsulated walls, floors or ceilings, or where they contain uninsulated ducts, piping or other sources of heating or cooling.

DISTRIBUTED WHOLE-HOUSE VENTILATION. A whole-house ventilation system shall be considered distributed when it supplies outdoor air directly (not transfer air) to each dwelling or sleeping unit habitable space (living room, den, office, interior adjoining spaces or bedroom), and exhausts air from all kitchens and bathrooms directly outside.

DWELLING UNIT. A single unit providing complete independent living facilities for one or more persons, including permanent provisions for living, sleeping, eating, cooking and sanitation. Dwelling units may also include the following uses:

1. Adult family homes, foster family care homes and family day care homes licensed by the Washington state department of social and health services.

2. Offices, mercantile, food preparation for off-site consumption, personal care salons or similar uses which are conducted primarily by the occupants of the dwelling unit and are secondary to the use of the unit for dwelling purposes, and which do not exceed 500 square feet (46.4 m2).

EGRESS ROOF ACCESS WINDOW. A skylight or roof window designed and installed to satisfy the Emergency Escape and Rescue Opening requirements of Section R310.2.

ENCLOSED KITCHEN. A kitchen whose permanent openings to interior adjacent spaces do not exceed a total of 60 square feet (6 m2).

FIRE SEPARATION DISTANCE. The distance measured from the foundation wall or face of the wall framing, whichever is closer, to one of the following:

1. To the closest interior lot line; or

2. To the centerline of a street, an alley or public way; or

3. To an imaginary line between two buildings on the lot.

The distance shall be measured at a right angle from the wall.

FLOOR AREA. The area within the inside perimeter of exterior walls of the building. The floor area of a building, or portion thereof, not provided with surrounding exterior walls shall be the usable area under the horizontal projection of the roof or floor above.

LANDING PLATFORM. A landing provided as the top step of a stairway accessing a Loft.

LOCAL EXHAUST. An exhaust system that uses one or more fans to exhaust air from a specific room or rooms within a residential dwelling or sleeping unit.

LOFT. A space on an intermediate level or levels between the floor and ceiling of a dwelling or sleeping unit, open on one or more sides to the room or space in which the loft is located, and in accordance with Section R333.

LOT LINE. The line which bounds a plot of ground described as a lot in the title to the property.

SALT WATER COASTAL AREA. Those areas designated as salt water coastal areas by the local jurisdiction.

SMALL BUSINESS. Any business entity (including a sole proprietorship, corporation, partnership or other legal entity) which is owned and operated independently from all other businesses, which has the purpose of making a profit, and which has fifty or fewer employees.

TOWNHOUSE UNIT. A single-family dwelling unit in a townhouse that extends from foundation to roof and that has a yard or public way on not less than two sides that extends at least 50 percent of the length of each of these two sides.

History

• Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 24-04-035, § 51-51-0202, filed 1/30/24, effective 3/15/24
• WSR 23-02-058, 23-12-104, and 23-20-024, § 51-51-0202, filed 1/3/23, 6/7/23, and 9/25/23, effective 3/15/24
• WSR 21-12-102, § 51-51-0202, filed 6/2/21, effective 7/3/21
• WSR 20-21-041, § 51-51-0202, filed 10/13/20, effective 11/13/20
• WSR 20-03-023, § 51-51-0202, filed 1/6/20, effective 7/1/20
• WSR 16-03-025, § 51-51-0202, filed 1/11/16, effective 7/1/16. Statutory Authority: RCW 19.27.031 and chapters 19.27 and 34.05 RCW. WSR 13-04-068, § 51-51-0202, filed 2/1/13, effective 7/1/13. Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 10-03-098, § 51-51-0202, filed 1/20/10, effective 7/1/10. Statutory Authority: RCW 19.27.190, 19.27.020, and chapters 19.27 and 34.05 RCW. WSR 09-04-023, § 51-51-0202, filed 1/27/09, effective 7/1/09
• WSR 08-01-102, § 51-51-0202, filed 12/18/07, effective 4/1/08. Statutory Authority: RCW 19.27.074, 19.27.020, and chapters 19.27 and 34.05 RCW. WSR 07-01-090, § 51-51-0202, filed 12/19/06, effective 7/1/07. Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 04-01-109, § 51-51-0202, filed 12/17/03, effective 7/1/04.

Wash. Admin. Code § 51-51-0301 Section R301—Design criteria.

R301.2 Climatic and geographic design criteria. Buildings shall be constructed in accordance with the provisions of this code as limited by the provisions of this section. Additional criteria shall be established by the local jurisdiction and set forth in Table R301.2. The local jurisdiction shall designate the salt water coastal areas within their jurisdiction.

R301.2.2.10 Anchorage of water heaters. In Seismic Design Categories D0, D1 and D2, and in townhouses in Seismic Design Category C, water heaters and thermal storage units shall be anchored against movement and overturning in accordance with Section M1307.2 or the Uniform Plumbing Code Section 507.2.

R301.5 Live load. The minimum uniformly distributed live load shall be as provided in Table R301.5.

TABLE R301.5

MINIMUM UNIFORMLY DISTRIBUTED LIVE LOADS

(in pounds per square foot)

| | Use | Uniform Load (psf) | Concentrated Load (lb) | | | --- | --- | --- | --- | --- | | | Uninhabitable attics without storageb | 10 | - | | | | Uninhabitable attics with limited storageb, g | 20 | - | | | | Habitable attics and attics served with fixed stairs | 30 | - | | | | Balconies (exterior) and deckse | 60j | - | | | | Fire escapes | 40 | - | | | | Guards | - | 200h,i | | | | Guard in-fill componentsf | - | 50h | | | | Handraild | - | 200h | | | | Passenger vehicle garagesa | 50a | 2,000 a | | | | Areas other than sleeping areas | 40 | - | | | | Sleeping areas | 30 | - | | | | Stairs | 40c | 300c | |

| For SI: 1 pound per square foot = 0.0479 kPa, 1 square inch = 645 mm, 1 pound = 4.45 N | | | --- | --- | | a. | Elevated garage floors shall be capable of supporting the uniformly distributed live load or a 2,000-pound concentrated load applied on an area of 4-1/2 inches by 4-1/2 inches, whichever produces the greater stresses. | | b. | Uninhabitable attics without storage are those where the clear height between joists and rafters is not more than 42 inches, or where there are not two or more adjacent trusses with web configurations capable of accommodating an assumed rectangle 42 inches in height by 24 inches in width, or greater, within the plane of the trusses. This live load need not be assumed to act concurrently with any other live load requirements. | | c. | Individual stair treads shall be capable of supporting the uniformly distributed live load or a 300-pound concentrated load applied on an area of 2 inches by 2 inches, whichever produces the greater stresses. | | d. | A single concentrated load applied in any direction at any point along the top. For a guard not required to serve as a handrail, the load need not be applied to the top element of the guard in a direction parallel to such element. | | e. | See Section R507.1 for decks attached to exterior walls. | | f. | Guard in-fill components (all those except the handrail), balusters and panel fillers shall be designed to withstand a horizontally applied normal load of 50 pounds on an area equal to 1 square foot. This load need not be assumed to act concurrently with any other live load requirement. | | g. | Uninhabitable attics with limited storage are those where the clear height between joists and rafters is 42 inches or greater, or where there are two or more adjacent trusses with web configurations capable of accommodating an assumed rectangle 42 inches in height by 24 inches in width, or greater, within the plane of the trusses. The live load need only be applied to those portions of the joists or truss bottom chords where all of the following conditions are met: | | g.1. | The attic area is accessed from an opening not less than 20 inches in width by 30 inches in length that is located where the clear height in the attic is not less than 30 inches. | | g.2. | The slopes of the joists or truss bottom chords are not greater than 2 units vertical to 12 units horizontal. | | g.3. | Required insulation depth is less than the joist or truss bottom chord member depth. The remaining portions of the joists or truss bottom chords shall be designed for a uniformly distributed concurrent live load of not less than 10 pounds per square foot. | | h. | Glazing used in handrail assemblies and guards shall be designed with a load adjustment factor of 4. The load adjustment factor shall be applied to each of the concentrated loads applied to the top of the rail, and to the load on the in-fill components. These loads shall be determined independent of one another, and loads are assumed not to occur with any other live load. | | i. | Where the top of a guard system is not required to serve as a handrail, the single concentrated load shall be applied at any point along the top, in the vertical downward direction and in the horizontal direction away from the walking surface. Where the top of a guard is also serving as the handrail, a single concentrated load shall be applied in any direction at any point along the top. Concentrated loads shall not be applied concurrently. | | j. | Where structural tables in Section R507 only specify snow loads, the values corresponding to 70 psf snow loads shall be used. |

History

• Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 23-23-104, § 51-51-0301, filed 11/15/23, effective 3/16/24
• WSR 23-02-058, 23-12-104, and 23-20-024, § 51-51-0301, filed 1/3/23, 6/7/23, and 9/25/23, effective 3/15/24
• WSR 20-03-023, § 51-51-0301, filed 1/6/20, effective 7/1/20
• WSR 16-03-025, § 51-51-0301, filed 1/11/16, effective 7/1/16. Statutory Authority: RCW 19.27.031 and chapters 19.27 and 34.05 RCW. WSR 13-04-068, § 51-51-0301, filed 2/1/13, effective 7/1/13. Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 10-03-098, § 51-51-0301, filed 1/20/10, effective 7/1/10. Statutory Authority: RCW 19.27.190, 19.27.020, and chapters 19.27 and 34.05 RCW. WSR 08-01-102, § 51-51-0301, filed 12/18/07, effective 4/1/08.

Wash. Admin. Code § 51-51-0302 Section R302—Fire-resistant construction.

R302.2.2 Common walls. Common walls separating townhouse units shall be assigned a fire resistance rating in accordance with Item 1 or 2 and shall be rated for fire exposure from both sides. Common walls shall extend to and be tight against the exterior sheathing of the exterior walls, or the inside face of exterior walls without stud cavities, and the underside of the roof sheathing. The common wall shared by two townhouse units shall be constructed without plumbing or mechanical equipment, ducts or vents, other than water-filled fire sprinkler piping in the cavity of the common wall. Electrical installations shall be in accordance with chapter 296-46B WAC, Electrical safety standards, administration, and installation. Penetrations of the membrane of common walls for electrical outlet boxes shall be in accordance with Section R302.4.

1. Where an automatic sprinkler system in accordance with Section P2904 is provided, the common wall shall be not less than a 1-hour fire-resistance-rated wall assembly tested in accordance with ASTM E119, UL 263 or Section 703.2.2 of the International Building Code.

2. Where an automatic sprinkler system in accordance with Section P2904 is not provided, the common wall shall be not less than a 2-hour fire-resistance-rated wall assembly tested in accordance with ASTM E119, UL 263 or Section 703.2.2 of the International Building Code.

| EXCEPTION: | Common walls are permitted to extend to and be tight against the interior side of the exterior walls if the cavity between the end of the common wall and the exterior sheathing is filled with a minimum of 2-inch nominal thickness wood studs. | | --- | --- |

R302.2.3Continuity. The fire-resistance-rated wall or assembly separating townhouse units shall be continuous from the foundation to the underside of the roof sheathing, deck or slab. The fire-resistance rating shall extend the full length of the wall or assembly, including wall extensions through and separating attached enclosed accessory structures.

Where a story extends beyond the exterior wall of a story below:

1. The fire-resistance-rated wall or assembly shall extend to the outside edge of the upper story (see Figure R302.2(1)); or

2. The underside of the exposed floor-ceiling assembly shall be protected as required for projections in Section R302 (see Figure R302.2(2)).

| | | --- |

R302.2.4 Parapets for townhouses. Parapets constructed in accordance with Section R302.2.5 shall be constructed for townhouses as an extension of exterior walls or common walls separating townhouse units in accordance with the following:

1. Where roof surfaces adjacent to the wall or walls are at the same elevation, the parapet shall extend not less than 30 inches (762 mm) above the roof surfaces.

2. Where roof surfaces adjacent to the wall or walls are at different elevations and the higher roof is not more than 30 inches (762 mm) above the lower roof, the parapet shall extend not less than 30 inches (762 mm) above the lower roof surface.

| EXCEPTION: | A parapet is not required in the preceding two cases where the roof covering complies with a minimum Class C rating as tested in accordance with ASTM E108 or UL 790 and the roof decking or sheathing is of noncombustible materials or fire retardant-treated wood for a distance of 4 feet (1219 mm) on each side of the wall or walls, or one layer of 5/8-inch (15.9 mm) Type X gypsum board is installed directly beneath the roof decking or sheathing, supported by not less than nominal 2-inch (51 mm) ledgers attached to the sides of the roof framing members, for a distance of not less than 4 feet (1219 mm) on each side of the wall or walls and any openings or penetrations in the roof are not within 4 feet (1219 mm) of the common walls. Fire retardant-treated wood shall meet the requirements of Sections R802.1.5 and R803.2.1.2. | | --- | --- |

3. A parapet is not required where roof surfaces adjacent to the wall or walls are at different elevations and the higher roof is more than 30 inches (762 mm) above the lower roof. The common wall construction from the lower roof to the underside of the higher roof deck shall have not less than a 1-hour fire-resistance rating. The wall shall be rated for exposure from both sides.

TABLE R302.1(1)

EXTERIOR WALLS

No Change to the Table

| a | The fire-resistance rating shall be permitted to be reduced to 0 hours on the underside of the eave overhang if fireblocking is provided from the wall top plate to the underside of the roof sheathing. | | --- | --- | | b | The fire-resistance rating shall be permitted to be reduced to 0 hours on the underside of the rake overhang where ventilation openings are not installed in the rake overhang or in walls that are common to attic areas. |

TABLE R302.1(2)

EXTERIOR WALLS - DWELLINGS WITH FIRE SPRINKLERS

No Change to the Table

| a | For residential subdivisions where all dwellings are equipped throughout with an automatic sprinkler system installed in accordance with Section P2904, the fire separation distance for exterior walls not fire-resistance-rated and for fire-resistance-rated projections shall be permitted to be reduced to 0 feet, and unlimited unprotected openings and penetrations shall be permitted, where the adjoining lot provides an open setback yard that is 6 feet or more in width on the opposite side of the property line. | | --- | --- | | b | The fire-resistance rating shall be permitted to be reduced to 0 hours on the underside of the eave overhang if fireblocking is provided from the wall top plate to the underside of the roof sheathing. | | c | The fire-resistance rating shall be permitted to be reduced to 0 hours on the underside of the rake overhang where ventilation openings are not installed in the rake overhang or in walls that are common to attic areas. |

R302.3 Two-family dwellings. Wall and floor/ceiling assemblies separating dwelling units in two-family dwellings shall be constructed in accordance with Section R302.3.1 through R302.3.5. One accessory dwelling unit constructed within an existing dwelling unit need not be considered a separated dwelling unit in a two-family dwelling where all required smoke alarms, in the accessory dwelling unit and the primary dwelling unit, are interconnected in such a manner that the actuation of one alarm will activate all alarms in both the primary dwelling unit and the accessory dwelling unit.

R302.3.1 Separation.Dwelling units in two-family dwellings shall be separated from each other by wall and floor assemblies having not less than a 1-hour fire-resistance rating where tested in accordance with ASTM E119, UL 263 or Section 703.2.2 of the International Building Code.

| EXCEPTIONS: | 1. A fire-resistance rating of 1/2 hour shall be permitted in buildings equipped throughout with an automatic sprinkler system installed in accordance with Section 2904. | | --- | --- | | | 2. Where an accessory dwelling unit is added within an existing single-family residence to create a two-family dwelling, fire-rated separation between the accessory dwelling unit and the primary dwelling unit is not required when all required smoke alarms are interconnected in such a manner that the actuation of one alarm will activate all alarms in both the primary dwelling unit and the accessory dwelling unit. |

R302.3.2 Continuity. Fire-resistance-rated floor/ceiling and wall assemblies shall extend to and be tight against the exterior wall, and wall assemblies shall extend from the foundation to the underside of the roof sheathing.

| EXCEPTION: | Wall assemblies need not extend through attic spaces where the ceiling is protected by not less than 5/8-inch (15.9 mm) Type X gypsum board, an attic draft stop constructed as specified in Section R302.12.1 is provided above and along the wall assembly separating the dwellings and the structural framing supporting the ceiling is protected by not less than 1/2-inch (12.7 mm) gypsum board or equivalent. | | --- | --- |

R302.3.3 Supporting construction. Where floor/ceiling assemblies are required to be fire-resistance rated by Section R302.3, the supporting construction of such assemblies shall have an equal or greater fire-resistance rating.

R302.3.4 Openings protection between two-family dwellings. Openings in the common fire-resistance-rated wall assembly located between units of a two-family dwelling shall be equipped with not less than a 45-minute fire-rated door assembly equipped with a self-closing or automatic-closing device.

| EXCEPTION: | A 20-minute fire-rated door assembly is permitted in buildings equipped throughout with an automatic sprinkler system installed in accordance with Section P2904 or NFPA 13D. | | --- | --- |

R302.3.5 Shared accessory rooms. Shared accessory rooms shall be separated from each individual dwelling unit in accordance with Table R302.3.5. Openings between the shared accessory room and the dwelling unit shall comply with Section R302.3.5.1. Attachment of gypsum board shall comply with Table R702.3.5.

R302.3.5.1 Opening protection. Openings from a shared accessory room or area directly into a room used for sleeping purposes shall not be permitted. Other openings between the shared accessory room or area shall be equipped with solid wood doors not less than 1 3/8 inches in thickness, solid or honeycomb core steel doors not less than 1 3/8 inches thick, or a fire door assembly with a 20-minute fire-protection rating, equipped with a self-closing or automatic-closing device.

R302.3.5.2 Duct penetration. Ducts penetrating the walls or ceilings separating the dwelling from the shared accessory room shall be constructed of a minimum No. 26 gage (0.48 mm) sheet steel or other approved material and shall not have openings into the shared accessory room.

R302.3.5.3 Other penetrations. Penetrations through the walls, ceiling, and floor level separation required in Section R302.3.5 shall be protected as required by Section R302.11, Item 4.

TABLE R302.3.5

DWELLING-SHARED ACCESSORY ROOM SEPARATION

| SEPARATION | MATERIAL | | --- | --- | | From the dwelling units and attics. | Not less than 1/2-inch gypsum board or equivalent applied to the accessory room side wall. | | From habitable rooms above or below the shared accessory room. | Not less than 5/8-inch Type X gypsum board or equivalent. | | Structures supporting floor/ceiling assemblies used for separation required by this section. | Not less than 1/2-inch gypsum board or equivalent. |

R302.13 Fire protection of floors. Floor assemblies that are not required elsewhere in this code to be fire-resistance rated, shall be provided with a 1/2-inch (12.7 mm) gypsum wallboard membrane, 5/8-inch (16 mm) wood structural panel membrane, or equivalent on the underside of the floor framing member. Penetrations or openings for ducts, vents, electrical outlets, lighting, devices, luminaires, wires, speakers, drainage, piping and similar openings or penetrations shall be permitted.

| EXCEPTIONS: | 1. Floor assemblies located directly over a space protected by an automatic sprinkler system in accordance with Appendix AWU, NFPA 13D, or other approved equivalent sprinkler system. | | --- | --- | | | 2. Floor assemblies located directly over a crawl space not intended for storage or fuel-fired appliances. | | | 3. Portions of floor assemblies shall be permitted to be unprotected when complying with the following: | | | 3.1. The aggregate area of the unprotected portions shall not exceed 80 square feet (7.4 m2) per story. | | | 3.2. Fire blocking in accordance with Section R302.11.1 is installed along the perimeter of the unprotected portion to separate the unprotected portion from the remainder of the floor assembly. | | | 4. Wood floor assemblies using dimension lumber or structural composite lumber with a cross sectional area equal to or greater than 2-inch by 10-inch (50.8 mm by 254 mm) nominal dimension, or other approved floor assemblies demonstrating equivalent fire performance. |

History

• Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 23-23-104, § 51-51-0302, filed 11/15/23, effective 3/16/24
• WSR 23-02-058, 23-12-104, and 23-20-024, § 51-51-0302, filed 1/3/23, 6/7/23, and 9/25/23, effective 3/15/24
• WSR 20-03-023, § 51-51-0302, filed 1/6/20, effective 7/1/20
• WSR 16-03-025, § 51-51-0302, filed 1/11/16, effective 7/1/16. Statutory Authority: RCW 19.27.074, 19.27.020, and 19.27.031. WSR 14-24-088, § 51-51-0302, filed 12/1/14, effective 5/1/15. Statutory Authority: Chapters 19.27A and 34.05 RCW. WSR 13-23-084, § 51-51-0302, filed 11/19/13, effective 4/1/14. Statutory Authority: RCW 19.27.031 and chapters 19.27 and 34.05 RCW. WSR 13-04-068, § 51-51-0302, filed 2/1/13, effective 7/1/13. Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 10-03-098, § 51-51-0302, filed 1/20/10, effective 7/1/10. Statutory Authority: RCW 19.27.190, 19.27.020, and chapters 19.27 and 34.05 RCW. WSR 09-04-023, § 51-51-0302, filed 1/27/09, effective 7/1/09
• WSR 08-01-102, § 51-51-0302, filed 12/18/07, effective 4/1/08.

Wash. Admin. Code § 51-51-0303 Section R303—Light, ventilation and heating.

R303.1 Natural light. All habitable rooms shall have an aggregate glazing area of not less than 8 percent of the floor area of such rooms.

| EXCEPTION: | The glazed areas need not be installed in rooms where artificial light is provided capable of producing an average illumination of 6 footcandles (65 lux) over the area of the room at a height of 30 inches (762 mm) above the floor level. | | --- | --- |

R303.2 Adjoining rooms. For the purpose of determining light requirements, any room shall be considered as a portion of an adjoining room when at least one-half of the area of the common wall is open and unobstructed and provides an opening of not less than one-tenth of the floor area of the interior room but not less than 25 square feet (2.3 m2).

| EXCEPTION: | Openings required for light shall be permitted to open into a sunroom with thermal isolation or a patio cover, provided there is an openable area between the adjoining room and the sunroom or a patio cover of not less than one-tenth of the floor area of the interior room but not less than 20 square feet (2 m2). | | --- | --- |

R303.3 Bathrooms. This section is not adopted.

R303.4 Minimum ventilation performance. Dwelling units shall be equipped with local exhaust and whole-house ventilation systems designed and installed as specified in Section M1505.

| EXCEPTION: | Additions with less than 500 square feet of conditioned floor area are exempt from the requirements in this Code for Whole-House Ventilation Systems. | | --- | --- |

R303.5.1 Intake openings. Mechanical and gravity outdoor air intake openings shall be located a minimum of 10 feet (3048 mm) from any hazardous or noxious contaminant, such as vents, chimneys, plumbing vents, streets, alleys, parking lots and loading docks, except as otherwise specified in this code.

For the purpose of this section, the exhaust from dwelling unit toilet rooms, bathrooms and kitchens shall not be considered as hazardous or noxious.

| EXCEPTIONS: | 1. The 10-foot (3048 mm) separation is not required where the intake opening is located 3 feet (914 mm) or greater below the contaminant source. | | --- | --- | | | 2. Vents and chimneys serving fuel-burning appliances shall be terminated in accordance with the applicable provisions of Chapters 18 and 24. | | | 3. Clothes dryer exhaust ducts shall be terminated in accordance with Section M1502.3. |

R303.5.2 Exhaust openings. Exhaust air shall not be directed onto walkways. All exhaust ducts shall terminate outside the building. Terminal elements shall have at least the equivalent net free area of the duct work.

R303.5.2.1 Exhaust ducts. Exhaust ducts shall be equipped with back-draft dampers. All exhaust ducts in unconditioned spaces shall be insulated to a minimum of R-4.

R303.7 Interior stairway illumination. Interior stairways shall be provided with an artificial light source to illuminate the landings and treads. Stairway illumination shall receive primary power from the building wiring. The light source shall be capable of illuminating treads and landings to levels not less than 1 foot-candle (11 lux) measured at the center of treads and landings. There shall be a wall switch at each floor level to control the light source where the stairway has six or more risers.

| EXCEPTION: | A switch is not required where remote, central or automatic control of lighting is provided. | | --- | --- |

R303.8 Exterior stairway illumination. Exterior stairways shall be provided with an artificial light source located at the top landing of the stairway. Stairway illumination shall receive primary power from the building wiring. Exterior stairways providing access to a basement from the outdoor grade level shall be provided with an artificial light source located at the bottom landing of the stairway.

R303.9 Required glazed openings. Required glazed openings shall open directly onto a street or public alley, or a yard or court located on the same lot as the building.

| EXCEPTIONS: | 1. Required glazed openings that face into a roofed porch where the porch abuts a street, yard or court are permitted where the longer side of the porch is not less than 65 percent unobstructed and the ceiling height is not less than 7 feet (2134 mm). | | --- | --- | | | 2. Eave projections shall not be considered as obstructing the clear open space of a yard or court. | | | 3. Required glazed openings that face into the area under a deck, balcony, bay or floor cantilever are permitted where an unobstructed pathway of not less than 36 inches (914 mm) in height, 36 inches (914 mm) in width, and no greater than 60 inches (1524 mm) in length is provided and opens to a yard or court. The pathway shall be measured from the exterior face of the glazed opening, or if the glazed opening is in a window well, at the window well wall furthest from the exterior face of the glazed opening. |

R303.10 Required heating. When the winter design temperature in Table R301.2 is below 60°F (16°C), every dwelling unit shall be provided with heating facilities capable of maintaining a minimum room temperature of 68°F (20°C) at a point 3 feet (914 mm) above the floor and 2 feet (610 mm) from exterior walls in all habitable rooms at design temperature. The installation of one or more portable heaters shall not be used to achieve compliance with this section.

| EXCEPTION: | Unheated recreational tents or yurts not exceeding 500 square feet provided it is not occupied as a permanent dwelling. | | --- | --- |

R303.10.1 Definitions. For the purposes of this section only, the following definitions apply.

DESIGNATED AREAS are those areas designated by a county to be an urban growth area in chapter 36.70A RCW and those areas designated by the U.S. Environmental Protection Agency as being in nonattainment for particulate matter.

SUBSTANTIALLY REMODELED means any alteration or restoration of a building exceeding 60 percent of the appraised value of such building within a 12-month period. For the purpose of this section, the appraised value is the estimated cost to replace the building and structure in kind, based on current replacement costs.

R303.10.2 Primary heating source. Primary heating sources in all new and substantially remodeled buildings in designated areas shall not be dependent upon wood stoves.

R303.10.3 Solid fuel burning devices. No new or used solid fuel burning device shall be installed in new or existing buildings unless such device is U.S. Environmental Protection Agency certified or exempt from certification by the United States Environmental Protection Agency and conforms with RCW 70A.15.1005, 70A.15.3500, 70A.15.3510, and 70A.15.3530.

| EXCEPTIONS: | 1. Wood cook stoves. | | --- | --- | | | 2. Antique wood heaters manufactured prior to 1940. |

History

• Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 23-23-104, § 51-51-0303, filed 11/15/23, effective 3/16/24
• WSR 23-02-058, 23-12-104, and 23-20-024, § 51-51-0303, filed 1/3/23, 6/7/23, and 9/25/23, effective 3/15/24
• WSR 20-03-023, § 51-51-0303, filed 1/6/20, effective 7/1/20
• WSR 16-03-025, § 51-51-0303, filed 1/11/16, effective 7/1/16. Statutory Authority: RCW 19.27.031 and chapters 19.27 and 34.05 RCW. WSR 13-04-068, § 51-51-0303, filed 2/1/13, effective 7/1/13. Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 10-03-098, § 51-51-0303, filed 1/20/10, effective 7/1/10
• WSR 04-01-109, § 51-51-0303, filed 12/17/03, effective 7/1/04.

Wash. Admin. Code § 51-51-0307 Section R307—Toilet, bath and shower spaces.

R307.1 Space required. Fixtures shall be spaced in accordance with Figure R307.1, and in accordance with the requirements of the state plumbing code Section 402.5.

History

• Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 16-03-025, § 51-51-0307, filed 1/11/16, effective 7/1/16.

Wash. Admin. Code § 51-51-0308 Reserved.

History

• Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 20-03-023, § 51-51-0308, filed 1/6/20, effective 7/1/20
• WSR 16-03-025, § 51-51-0308, filed 1/11/16, effective 7/1/16.

Wash. Admin. Code § 51-51-0309 Section R309—Garages and carports.

R309.6 Electric vehicle charging.

R309.6.1 Application. The provisions of this section shall apply to the construction of new dwelling units per Section R101.2 with attached private garages or attached private carports.

| EXCEPTION: | Where there is no public utility or commercial power supply. | | --- | --- |

R309.6.2 Dedicated circuit for electric vehicle charging. A minimum of one 40-ampere dedicated 208/240-volt branch circuit shall be installed in the electrical panel for each dwelling unit.

The branch circuit shall terminate at a junction box, receptacle outlet, or electric vehicle charging equipment.

History

• Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 23-02-058, 23-12-104, and 23-20-024, § 51-51-0309, filed 1/3/23, 6/7/23, and 9/25/23, effective 3/15/24.

Wash. Admin. Code § 51-51-03100 Section 310—Emergency escape and rescue openings.

R310.1 Emergency escape and rescue opening required. Basements, habitable attics and every sleeping room shall have not less than one operable emergency escape and rescue opening. Where basements contain one or more sleeping rooms, an emergency escape and rescue opening shall be required in each sleeping room. Emergency escape and rescue openings shall open directly into a public way, or to a yard or court providing an unobstructed path with a width of not less than 36 inches (914 mm) that opens to a public way.

| EXCEPTIONS: | 1. Storm shelters and basements used only to house mechanical equipment not exceeding a total floor area of 200 square feet (18.58 m). | | --- | --- | | | 2. Where the dwelling unit or townhouse unit is equipped with an automatic sprinkler system installed in accordance with Section P2904, sleeping rooms in basements shall not be required to have emergency escape and rescue openings provided that the basement has one of the following: | | | 2.1. One means of egress complying with Section R311 and one emergency escape and rescue opening. | | | 2.2. Two means of egress complying with Section R311. | | | 3. A yard shall not be required to open directly into a public way where the yard opens to an unobstructed path from the yard to the public way. Such path shall have a width of not less than 36 inches (914 mm). The following shall not be considered obstructions: | | | 3.1. Gates with operational constraints and opening control devices without the use of keys, tools, or special knowledge. | | | 3.2. Window wells equipped with a removable cover complying with Section R310.4.4. |

R310.2.4 Emergency escape and rescue openings under decks, porches, and cantilevers. Emergency escape and rescue openings installed under decks, porches, and cantilevers shall be fully openable and provided with an unobstructed pathway of not less than 36 inches (914 mm) in height, 36 inches (914 mm) in width, and no greater than 60 inches (1524 mm) in length that opens to a yard or court. The pathway shall be measured from the exterior face of the glazed opening, or if the glazed opening is in a window well, at the window well wall furthest from the exterior face of the glazed opening.

R310.5 Replacement windows for emergency escape and rescue openings. This section is not adopted.

History

• Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 23-02-058, 23-12-104, and 23-20-024, § 51-51-03100, filed 1/3/23, 6/7/23, and 9/25/23, effective 3/15/24
• WSR 20-21-041, § 51-51-03100, filed 10/13/20, effective 11/13/20
• WSR 20-03-023, § 51-51-03100, filed 1/6/20, effective 7/1/20.

Wash. Admin. Code § 51-51-0311 Section R311—Means of egress.

R311.4 Vertical egress. Egress from habitable levels including habitable attics and basements not provided with an egress door in accordance with Section R311.2 shall be by a ramp in accordance with Section R311.8 or a stairway in accordance with Section R311.7.

| EXCEPTION: | Stairways, alternating tread devices, ship's ladders, or ladders within an individual dwelling unit or sleeping unit used for access to areas of 200 square feet (18.6 m2) or less, are exempt from the requirements of Sections R311.4 and R311.7, where such devices do not provide exclusive access to a kitchen or bathroom. Such areas shall not be located more than 10 feet (3048 mm) above the finished floor of the space below. | | --- | --- |

R311.7.11 Alternating tread devices.Alternating tread devices shall not be used as an element of a means of egress. Alternating tread devices shall be permitted provided that a required means of egress stairway or ramp serves the same space at each adjoining level or where a means of egress is not required. The clear width at and below the handrails shall be not less than 20 inches (508 mm).

| EXCEPTION: | Not adopted. | | --- | --- |

R311.7.12 Ship's ladders. Ship's ladders shall not be used as an element of a means of egress. Ship's ladders shall be permitted provided that a required means of egress stairway or ramp serves the same space at each adjoining level or where a means of egress is not required. The clear width at and below the handrails shall be not less than 20 inches (508 mm).

| EXCEPTION: | Not adopted. | | --- | --- |

History

• Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 23-23-104, § 51-51-0311, filed 11/15/23, effective 3/16/24
• WSR 23-02-058, 23-12-104, and 23-20-024, § 51-51-0311, filed 1/3/23, 6/7/23, and 9/25/23, effective 3/15/24
• WSR 20-03-023, § 51-51-0311, filed 1/6/20, effective 7/1/20
• WSR 10-03-098, § 51-51-0311, filed 1/20/10, effective 7/1/10. Statutory Authority: RCW 19.27.074, 19.27.020, and chapters 19.27 and 34.05 RCW. WSR 07-01-090, § 51-51-0311, filed 12/19/06, effective 7/1/07. Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 04-01-109, § 51-51-0311, filed 12/17/03, effective 7/1/04.

Wash. Admin. Code § 51-51-0312 Section R312—Guards and window fall protection.

R312.1.1 Where required.Guards shall be provided for those portions of open-sided walking surfaces, including floors, mezzanines, lofts in accordance with Section R333, stairs, ramps, and landings, that are located more than 30 inches (762 mm) measured vertically to the floor or grade below at any point within 36 inches (914 mm) horizontally to the edge of the open side. Insect screening shall not be considered as a guard.

R312.1.2 Height. Required guards at open-sided walking surfaces, including stairs, porches, balconies or landings, shall be not less than 36 inches (914 mm) in height as measured vertically above the adjacent walking surface or the line connecting the nosings.

| EXCEPTIONS: | 1. Guards on the open sides of stairs shall have a height of not less than 34 inches (864 mm) measured vertically from a line connecting the nosings. | | --- | --- | | | 2. Where the top of the guard serves as a handrail on the open sides of stairs, the top of the guard shall be not less than 34 inches (864 mm) and not more than 38 inches (965 mm) as measured vertically from a line connecting the nosings. | | | 3. In areas with ceiling heights of 7 feet (2134 mm) or less in lofts constructed in accordance with Section R333, guards shall not be less than 36 inches (914 mm) in height or one-half of the clear height from the loft floor to the loft ceiling, whichever is less. |

History

• Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 23-23-104, § 51-51-0312, filed 11/15/23, effective 3/16/24
• WSR 23-02-058, 23-12-104, and 23-20-024, § 51-51-0312, filed 1/3/23, 6/7/23, and 9/25/23, effective 3/15/24.

Wash. Admin. Code § 51-51-0313 Section R313—Automatic fire sprinkler systems.

R313.1 Townhouse automatic fire sprinkler systems. An automatic residential fire sprinkler system shall be installed in a townhouse unit.

| EXCEPTIONS: | 1. An automatic residential fire sprinkler system shall not be required where additions or alterations are made to an existing townhouse unit that does not have an automatic residential fire sprinkler system installed. | | --- | --- | | | 2. Townhouse buildings containing no more than four townhouse units. |

R313.1.1 Design and installation. Automatic residential fire sprinkler systems for a townhouse unit shall be designed and installed in accordance with Section P2904 or NFPA 13D.

R313.2 One- and two-family dwellings automatic sprinkler systems. This section is not adopted.

History

• Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 23-02-058, 23-12-104, and 23-20-024, § 51-51-0313, filed 1/3/23, 6/7/23, and 9/25/23, effective 3/15/24
• WSR 20-03-023, § 51-51-0313, filed 1/6/20, effective 7/1/20
• WSR 16-03-025, § 51-51-0313, filed 1/11/16, effective 7/1/16. Statutory Authority: Chapter 19.27 RCW. WSR 10-18-036, § 51-51-0313, filed 8/25/10, effective 9/25/10. Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 10-03-098, § 51-51-0313, filed 1/20/10, effective 7/1/10. Statutory Authority: RCW 19.27.074, 19.27.020, and chapters 19.27 and 34.05 RCW. WSR 07-01-090, § 51-51-0313, filed 12/19/06, effective 7/1/07. Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 04-01-109, § 51-51-0313, filed 12/17/03, effective 7/1/04.

Wash. Admin. Code § 51-51-0314 Section R314—Smoke alarms and heat detection.

R314.1 General. Smoke alarms, heat detectors, and heat alarms shall comply with NFPA 72 and this section.

R314.1.1 Listings. Smoke alarms shall be listed in accordance with UL 217. Heat detectors and heat alarms shall be listed for the intended application. Combination smoke and carbon monoxide alarms shall be listed in accordance with UL 217 and UL 2034.

R314.2 Where required. Smoke alarms, heat detectors, and heat alarms shall be provided in accordance with this section.

R314.2.1 New construction. Smoke alarms shall be provided in dwelling units. A heat detector or heat alarm shall be provided in new attached garages.

R314.2.2 Alterations, repairs and additions. Where alterations, repairs or additions requiring a permit occur, or where one or more sleeping rooms are added or created in existing dwellings, or where an accessory dwelling unit is created within an existing dwelling unit, each dwelling unit shall be equipped with smoke alarms as required for new dwellings.

| EXCEPTIONS: | 1. Work involving the exterior surfaces of dwellings, such as the replacement of roofing or siding, the addition or replacement of windows or doors, or the addition of a porch or deck are exempt from the requirements of this section. | | --- | --- | | | 2. Installation, alteration or repairs of plumbing, electrical or mechanical systems are exempt from the requirements of this section. |

R314.2.3 New attached garages. A heat detector or heat alarm rated for the ambient outdoor temperatures and humidity shall be installed in new garages that are attached to or located under new and existing dwellings. Heat detectors and heat alarms shall be installed in a central location and in accordance with the manufacturer's instructions.

| EXCEPTION: | Heat detectors and heat alarms shall not be required in dwellings without commercial power. | | --- | --- |

R314.3 Location. Smoke alarms shall be installed in the following locations:

1. In each sleeping room.

2. Outside each separate sleeping area in the immediate vicinity of the bedrooms.

3. On each additional story of the dwelling, including basements and habitable attics but not including crawl spaces and uninhabitable attics. In dwellings or dwelling units with split levels and without an intervening door between the adjacent levels, a smoke alarm installed on the upper level shall suffice for the adjacent lower level provided that the lower level is less than one full story below the upper level.

4. Smoke alarms shall be installed not less than 3 feet (914 mm) horizontally from the door or opening of a bathroom that contains a bathtub or shower unless this would prevent placement of a smoke alarm required by Section R314.3.

5. In napping areas in a family home child care.

6. In the hallway and in the room open to the hallway in dwelling units where the ceiling height of a room open to a hallway serving bedrooms exceeds that of the hallway by 24 inches (610 mm) or more.

7. Within the room to which a loft is open, in the immediate vicinity of the loft.

R314.4 Interconnection. Where more than one smoke alarm is required to be installed within an individual dwelling unit in accordance with Section R314.3, the alarm devices shall be interconnected in such a manner that the actuation of one alarm will activate all of the alarms in the individual dwelling unit. Where an accessory dwelling unit is created within an existing dwelling unit all required smoke alarms, in the accessory dwelling unit and the primary dwelling unit, shall be interconnected in such a manner that the actuation of one alarm will activate all alarms in both the primary dwelling unit and the accessory dwelling unit. Physical interconnection of smoke alarms shall not be required where listed wireless alarms are installed and all alarms sound upon activation of one alarm.

| EXCEPTION: | Smoke alarms and alarms installed to satisfy Section R314.4.1 shall not be required to be interconnected to existing smoke alarms where such existing smoke alarms are not interconnected or where such new smoke alarm or alarm is not capable of being interconnected to the existing smoke alarms. | | --- | --- |

R314.4.1 Heat detection interconnection. Heat detectors and heat alarms shall be connected to an alarm or a smoke alarm that is installed in the dwelling. Alarms and smoke alarms that are installed for this purpose shall be located in a hallway, room, or other location that will provide occupant notification.

R314.6 Power source. Smoke alarms, heat alarms, and heat detectors shall receive their primary power from the building wiring where such wiring is served from a commercial source and, where primary power is interrupted, shall receive power from a battery. Wiring shall be permanent and without a disconnecting switch other than those required for overcurrent protection.

| EXCEPTIONS: | 1. Smoke alarms shall be permitted to be battery operated where installed in buildings without commercial power. | | --- | --- | | | 2. Smoke alarms installed in accordance with Section R314.2.2 shall be permitted to be battery powered. |

History

• Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 23-23-104, § 51-51-0314, filed 11/15/23, effective 3/16/24
• WSR 23-02-058, 23-12-104, and 23-20-024, § 51-51-0314, filed 1/3/23, 6/7/23, and 9/25/23, effective 3/15/24
• WSR 20-21-041, § 51-51-0314, filed 10/13/20, effective 11/13/20
• WSR 20-03-023, § 51-51-0314, filed 1/6/20, effective 7/1/20
• WSR 16-03-025, § 51-51-0314, filed 1/11/16, effective 7/1/16. Statutory Authority: RCW 19.27.031 and chapters 19.27 and 34.05 RCW. WSR 13-04-068, § 51-51-0314, filed 2/1/13, effective 7/1/13. Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 10-03-098, § 51-51-0314, filed 1/20/10, effective 7/1/10.

Wash. Admin. Code § 51-51-0315 Section R315—Carbon monoxide alarms.

R315.2 Where required. Carbon monoxide alarms shall be provided in accordance with Sections R315.2.1 and R315.2.2.

R315.2.1 New construction. For new construction, an approved carbon monoxide alarm shall be installed outside of each separate sleeping area in the immediate vicinity of the bedrooms in dwelling units and on each level of the dwelling in accordance with the manufacturer's recommendation.

R315.2.2 Alterations, repairs, and additions. Existing dwellings shall be equipped with carbon monoxide alarms in accordance with Section R315.2.1. An inspection will occur where alterations, repairs, or additions requiring a permit occur, or where one or more sleeping rooms are added or created.

| EXCEPTIONS: | 1. Work involving only the exterior surfaces of dwellings, such as the replacement of roofing or siding, or the addition or replacement of windows or doors, or the addition of a porch or deck, is exempt from the inspection requirements of this section. | | --- | --- | | | 2. Installation, alteration or repairs of nonfuel burning plumbing or mechanical systems or electrical systems are exempt from the inspection requirements of this section. | | | 3. Owner-occupied single-family residences legally occupied before July 26, 2009. RCW 19.27.530 (2)(b). |

R315.3 Location. Carbon monoxide alarms in dwelling units shall be installed outside of each separate sleeping area in the immediate vicinity of the bedrooms and on each level of the dwelling and in accordance with the manufacturer's recommendations. Where a fuel burning appliance is located within a bedroom or its attached bathroom, a carbon monoxide alarm shall be installed within the bedroom.

History

• Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 20-21-041, § 51-51-0315, filed 10/13/20, effective 11/13/20
• WSR 20-03-023, § 51-51-0315, filed 1/6/20, effective 7/1/20
• WSR 16-03-025, § 51-51-0315, filed 1/11/16, effective 7/1/16. Statutory Authority: RCW 19.27.031 and chapters 19.27 and 34.05 RCW. WSR 13-04-068, § 51-51-0315, filed 2/1/13, effective 7/1/13. Statutory Authority: RCW 19.27.074 and 19.27.530. WSR 12-01-099, § 51-51-0315, filed 12/20/11, effective 4/1/12. Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 10-03-098, § 51-51-0315, filed 1/20/10, effective 7/1/10.

Wash. Admin. Code § 51-51-0317 Reserved.

History

• Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 10-03-098, § 51-51-0317, filed 1/20/10, effective 7/1/10. Statutory Authority: RCW 19.27.190, 19.27.020, and chapters 19.27 and 34.05 RCW. WSR 08-01-102, § 51-51-0317, filed 12/18/07, effective 4/1/08. Statutory Authority: RCW 19.27.074, 19.27.020, and chapters 19.27 and 34.05 RCW. WSR 07-01-090, § 51-51-0317, filed 12/19/06, effective 7/1/07.

Wash. Admin. Code § 51-51-0322 Reserved.

History

• Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 16-03-025, § 51-51-0322, filed 1/11/16, effective 7/1/16
• WSR 10-03-098, § 51-51-0322, filed 1/20/10, effective 7/1/10.

Wash. Admin. Code § 51-51-03240 Section R324—Solar energy systems.

R324.3 Photovoltaic systems. Installation, modification, or alteration of solar photovoltaic power systems shall comply with this section and the International Fire Code. Section R104.11 alternative materials and methods of this code shall be considered when approving the installation of solar photovoltaic power systems. Photovoltaic systems shall be designed and installed in accordance with Sections R324.3.1 through R324.6 and chapter 19.28 RCW. Inverters shall be listed and labeled in accordance with UL 1741. Systems connected to the utility grid shall use inverters listed for utility interaction.

| EXCEPTION: | Detached, nonhabitable Group U structures shall not be subject to the requirements of this section for structural and fire safety. | | --- | --- |

R324.4 Rooftop-mounted photovoltaic systems. Rooftop-mounted photovoltaic panel systems installed on or above the roof covering shall be designed and installed in accordance with Section R907.

| EXCEPTION: | The roof structure shall be deemed adequate to support the load of the rooftop solar photovoltaic system if all of the following requirements are met: | | --- | --- | | | 1. The solar photovoltaic panel system shall be designed for the wind speed of the local area, and shall be installed per the manufacturer's specifications. | | | 2. The ground snow load does not exceed 70 pounds per square foot (3.35 kPa). | | | 3. The total dead load of modules, supports, mountings, raceways, and all other appurtenances weigh no more than 4 pounds per square foot (19.5 kg/m2). | | | 4. Photovoltaic modules are not mounted higher than 18 inches (457 mm) above the surface of the roofing to which they are affixed. | | | 5. Supports for solar modules are to be installed to spread the dead load across as many roof-framing members as needed, so that no point load exceeds 50 pounds (22.7 kg). |

R324.7.1 This section is not adopted.

History

• Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 23-23-104, § 51-51-03240, filed 11/15/23, effective 3/16/24
• WSR 20-21-041, § 51-51-03240, filed 10/13/20, effective 11/13/20
• WSR 20-03-023, § 51-51-03240, filed 1/6/20, effective 7/1/20
• WSR 16-03-025, § 51-51-03240, filed 1/11/16, effective 7/1/16.

Wash. Admin. Code § 51-51-0325 Section R325—Mezzanines.

R325.1 General. Mezzanines shall comply with Sections R325 through R325.5. Habitable attics shall comply with Section R326.

History

• Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 20-21-041, § 51-51-0325, filed 10/13/20, effective 11/13/20
• WSR 20-03-023, § 51-51-0325, filed 1/6/20, effective 7/1/20
• WSR 16-03-025, § 51-51-0325, filed 1/11/16, effective 7/1/16
• WSR 14-04-049, § 51-51-0325, filed 1/27/14, effective 2/27/14. Statutory Authority: RCW 19.27.031 and chapters 19.27 and 34.05 RCW. WSR 13-04-068, § 51-51-0325, filed 2/1/13, effective 7/1/13. Statutory Authority: Chapter 19.27 RCW. WSR 10-18-036, § 51-51-0325, filed 8/25/10, effective 9/25/10. Statutory Authority: RCW 19.27.190, 19.27.020, and chapters 19.27 and 34.05 RCW. WSR 09-04-023, § 51-51-0325, filed 1/27/09, effective 7/1/10. Statutory Authority: RCW 19.27.074, 19.27.020, and chapters 19.27 and 34.05 RCW. WSR 07-01-090, § 51-51-0325, filed 12/19/06, effective 7/1/07. Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 04-01-109, § 51-51-0325, filed 12/17/03, effective 7/1/04.

Wash. Admin. Code § 51-51-0326 Section R326—Habitable attics.

R326.1 General.Habitable attics shall comply with Sections R326.1 through R326.4.

| EXCEPTION: | Lofts in dwelling units and sleeping units shall be permitted to comply with Section R333, subject to the limitations in Section R333.1. | | --- | --- |

History

• Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 23-23-104, § 51-51-0326, filed 11/15/23, effective 3/16/24
• WSR 23-02-058, 23-12-104, and 23-20-024, § 51-51-0326, filed 1/3/23, 6/7/23, and 9/25/23, effective 3/15/24
• WSR 20-03-023, § 51-51-0326, filed 1/6/20, effective 7/1/20. Statutory Authority: RCW 19.27.031 and chapters 19.27 and 34.05 RCW. WSR 13-04-068, § 51-51-0326, filed 2/1/13, effective 7/1/13. Statutory Authority: RCW 19.27.074, 19.27.020, and chapters 19.27 and 34.05 RCW. WSR 07-01-090, § 51-51-0326, filed 12/19/06, effective 7/1/07.

Wash. Admin. Code § 51-51-0327 Section R327—Swimming pools, spas, and hot tubs.

R327.1 General. The design and construction of swimming pools, spas, and other aquatic recreation facilities shall comply with the 2021 International Swimming Pool and Spa Code, if the facility is one of the following:

1. For the sole use of residents and invited guests at a single-family dwelling;

2. For the sole use of residents and invited guests of a duplex owned by the residents; or

3. Operated exclusively for physical therapy or rehabilitation and under the supervision of a licensed medical practitioner.

History

• Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 23-02-058, 23-12-104, and 23-20-024, § 51-51-0327, filed 1/3/23, 6/7/23, and 9/25/23, effective 3/15/24
• WSR 20-03-023, § 51-51-0327, filed 1/6/20, effective 7/1/20. Statutory Authority: RCW 19.27.074, 19.27.020, and chapters 19.27 and 34.05 RCW. WSR 07-01-090, § 51-51-0327, filed 12/19/06, effective 7/1/07.

Wash. Admin. Code § 51-51-0328 Section R328—Energy storage systems.

R328.2 Equipment listings. ESS shall be listed and labeled for residential use in accordance with UL 9540.

| EXCEPTIONS: | 1. Where approved, repurposed unlisted battery systems from electric vehicles are allowed to be installed outdoors or in detached sheds located not less than 5 feet (1524 mm) from exterior walls, property lines, and public ways. | | --- | --- | | | 2. Battery systems that are an integral part of an electric vehicle are allowed provided that the installation complies with Section 625.48 of NFPA 70. | | | 3. Battery systems less than 1 kWh (3.6 megajoules). |

R328.12 Commissioning. ESS shall be commissioned as follows:

1. Verify that the system is installed in accordance with the approved plans and manufacturer's instructions and is operating properly.

2. Provide a copy of the manufacturer's installation, operation, maintenance, and decommissioning instructions provided with the listed system.

3. Provide a label on the installed system containing the contact information for the qualified maintenance and service providers.

R328.12.1 Installation prior to closing. Where the system is installed in a one- or two-family dwelling or townhouse unit that is owned by the builder and has yet to be sold, commissioning shall be conducted as outlined in Section R328.12, and the builder shall then transfer the required information in Section R328.12 to the homeowner when the property is transferred to the owner at the closing.

History

• Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 23-02-058, 23-12-104, and 23-20-024, § 51-51-0328, filed 1/3/23, 6/7/23, and 9/25/23, effective 3/15/24
• WSR 20-03-023, § 51-51-0328, filed 1/6/20, effective 7/1/20
• WSR 16-03-025, § 51-51-0328, filed 1/11/16, effective 7/1/16. Statutory Authority: RCW 19.27.031 and chapters 19.27 and 34.05 RCW. WSR 13-04-068, § 51-51-0328, filed 2/1/13, effective 7/1/13.

Wash. Admin. Code § 51-51-0329 Reserved.

History

• Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 23-02-058, 23-12-104, and 23-20-024, § 51-51-0329, filed 1/3/23, 6/7/23, and 9/25/23, effective 3/15/24
• WSR 20-03-023, § 51-51-0329, filed 1/6/20, effective 7/1/20
• WSR 16-03-025, § 51-51-0329, filed 1/11/16, effective 7/1/16.

Wash. Admin. Code § 51-51-0330 Section R330—Adult family homes.

R330.1 General. This section shall apply to all newly constructed adult family homes and all existing single-family homes being converted to adult family homes. This section shall not apply to those adult family homes licensed by the state of Washington department of social and health services prior to July 1, 2001.

R330.2 Reserved.

R330.3 Sleeping room classification. Each sleeping room in an adult family home shall be classified as:

1. Type S - Where the means of egress contains stairs, elevators, or platform lifts.

2. Type NS1 - Where one means of egress is at grade level or a ramp constructed in accordance with Section R330.9 is provided.

3. Type NS2 - Where two means of egress are at grade level or ramps constructed in accordance with Section R330.9 are provided.

R330.4 Types of locking devices and door activation. All bedroom and bathroom doors shall be openable from the outside when locked.

Every closet shall be readily openable from the inside.

Operable parts of door handles, pulls, latches, locks, and other devices installed in adult family homes shall be operable with one hand and shall not require tight grasping, pinching or twisting of the wrist. Pocket doors shall have graspable hardware available when in the closed or open position.

The force required to activate operable parts shall be 5.0 pounds (22.2 N) maximum. Required exit doors shall have no additional locking devices.

Required exit door hardware shall unlock inside and outside mechanisms when exiting the building allowing reentry into the adult family home without the use of a key, tool or special knowledge.

R330.5 Smoke and carbon monoxide alarm requirements. All adult family homes shall be equipped with smoke and carbon monoxide alarms installed as required in Sections R314 and R315.1. Alarms shall be installed in such a manner so that the detection device warning is audible from all areas of the dwelling upon activation of a single alarm.

R330.6 Escape windows and doors. Every sleeping room shall be provided with emergency escape and rescue windows as required by Section R310. No alternatives to the sill height such as steps, raised platforms or other devices placed by the openings will be approved as meeting this requirement.

R330.7 Fire apparatus access roads and water supply for fire protection. Adult family homes shall be served by fire apparatus access roads and water supplies meeting the requirements of the local jurisdiction.

R330.8 Grab bar general requirements. Where facilities are designated for use by adult family home clients, grab bars for water closets, bathtubs, and shower stalls shall be installed according to this section.

R330.8.1 Grab bar cross section. Grab bars with a circular cross section shall have an outside diameter of 1 1/4 inch (32 mm) minimum and 2 inches (50 mm) maximum. Grab bars with noncircular cross section shall have a cross section dimension of 2 inches (50 mm) maximum and a perimeter dimension of 4 inches (102 mm) minimum and 4 5/8 inches maximum.

R330.8.2 Grab bar installation. Grab bars shall have a spacing of 1 1/2 inch (32 mm) between the wall and the bar. Projecting objects, control valves and bathtub or shower stall enclosure features above, below and at the ends of the grab bar shall have a clear space of 1 1/2 inch (32 mm) to the grab bar.

| EXCEPTION: | Swing-up grab bars shall not be required to meet the 1 1/2 inch (32 mm) spacing requirement. | | --- | --- |

Grab bars shall have a structural strength of 250 pounds applied at any point on the grab bar, fastener, mounting device or supporting structural member. Grab bars shall not be supported directly by any residential grade fiberglass bathing or showering unit. Acrylic bars found in bathing units shall be removed.

Fixed position grab bars, when mounted, shall not rotate, spin or move and have a graspable surface finish.

R330.8.3 Grab bars at water closets. Water closets shall have grab bars mounted on both sides. Grab bars can be a combination of fixed position and swing-up bars. Grab bars shall meet the requirements of Section R330.8. Grab bars shall mount between 33 inches (838 mm) and 36 inches (914 mm) above floor grade. Centerline distance between grab bars, regardless of type used, shall be between 25 inches (635 mm) minimum and 30 inches (762 mm) maximum.

R330.8.3.1 Fixed position grab bars. Fixed position grab bars shall be a minimum of 36 inches (914 mm) in length and start 12 inches (305 mm) from the rear wall.

R330.8.3.2 Swing-up grab bars. Swing-up grab bars shall be a minimum of 28 inches (711 mm) in length from the rear wall.

R330.8.4 Grab bars at bathtubs. Horizontal and vertical grab bars shall meet the requirements of Section R330.8.

R330.8.4.1 Vertical grab bars. Vertical grab bars shall be a minimum of 18 inches (457 mm) long and installed at the control end wall and head end wall. Grab bars shall mount within 4 inches (102 mm) of the exterior of the bathtub edge or within 4 inches (102 mm) within the bathtub. The bottom end of the bar shall start between 36 inches (914 mm) and 42 inches (1067 mm) above floor grade.

| EXCEPTION: | The required vertical grab bar can be substituted with a floor to ceiling grab bar meeting the requirements of Section R325.8 at the control end and head end entry points. | | --- | --- |

R330.8.4.2 Horizontal grab bars. Horizontal grab bars shall be provided at the control end, head end, and the back wall within the bathtub area. Grab bars shall be mounted between 33 inches (838 mm) and 36 inches (914 mm) above floor grade. Control end and head end grab bars shall be 24 inches (610 mm) minimum in length. Back wall grab bars shall be 36 inches (914 mm) minimum in length.

R330.8.5 Grab bars at shower stalls. Where shower stalls are provided to meet the requirements for bathing facilities, grab bars shall meet the requirements of Section R330.8.

| EXCEPTION: | Shower stalls with permanent built-in seats are not required to have vertical or horizontal grab bars at the seat end wall. A vertical floor to ceiling grab bar shall be installed within 4 inches of the exterior of the shower aligned with the nose of the built-in seat. | | --- | --- |

R330.8.5.1 Vertical grab bars. Vertical grab bars shall be 18 inches (457 mm) minimum in length and installed at the control end wall and head end wall. Vertical bars shall be mounted within 4 inches (102 mm) of the exterior of the shower stall or within 4 inches (102 mm) inside the shower stall. The bottom end of vertical bars mount between 36 inches (914 mm) and 42 inches (1067 mm) above floor grade.

R330.8.5.2 Horizontal grab bars. Horizontal grab bars shall be installed on all sides of the shower stall mounted between 33 inches (838 mm) and 36 inches (914 mm) above the floor grade. Horizontal grab bars shall be a maximum of 6 inches (152 mm) from adjacent walls. Horizontal grab bars shall not interfere with shower control valves.

R330.9 Ramps. All interior and exterior ramps, when provided, shall be constructed in accordance with Section R311.8 with a maximum slope of 1 vertical to 12 horizontal. The exception to Section R311.8.1 is not allowed for adult family homes. Handrails shall be installed in accordance with Section R330.9.1.

R330.9.1 Handrails for ramps. Handrails shall be installed on both sides of ramps between the slope of 1 vertical to 12 horizontal and 1 vertical and 20 horizontal in accordance with Sections R311.8.3.1 through R311.8.3.3.

R330.10 Stair treads and risers. Stair treads and risers shall be constructed in accordance with Section R311.7.5. Handrails shall be installed in accordance with Section R330.10.1.

R330.10.1 Handrails for treads and risers. Handrails shall be installed on both sides of treads and risers numbering from one riser to multiple risers. Handrails shall be installed in accordance with Sections R311.7.8.1 through R311.7.8.4.

R330.11 Shower stalls. Where provided to meet the requirements for bathing facilities, the minimum size of shower stalls for an adult family home shall be 30 inches (762 mm) deep by 48 inches (1219 mm) long.

History

• Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 23-23-104, § 51-51-0330, filed 11/15/23, effective 3/16/24
• WSR 20-03-023, § 51-51-0330, filed 1/6/20, effective 7/1/20.

Wash. Admin. Code § 51-51-0331 Section R331—Family home child care.

R331.1 Family home child care. For family home child care with more than six children, each floor level used for family child care purposes shall be served by two remote means of egress. Exterior exit doors shall be operable from the inside without the use of keys or any special knowledge or effort.

Basements located more than 4 feet below grade level shall not be used for family home child care unless one of following conditions exist:

1. Stairways from the basement open directly to the exterior of the building without entering the first floor;

2. One of the two required means of egress discharges directly to the exterior from the basement level, and a self-closing door is installed at the top or bottom of the interior stair leading to the floor above;

3. One of the two required means of egress is an operable window or door, approved for emergency escape or rescue, that opens directly to a public street, public alley, yard or exit court; or

4. An automatic residential sprinkler system shall be designed and installed in accordance with Section P2904 or NFPA 13D.

Floors located more than 4 feet above grade level shall not be occupied by children in family home child care.

| EXCEPTIONS: | 1. Use of toilet facilities while under supervision of an adult staff person; | | --- | --- | | | 2. Family home child care may be allowed on the second story if one of the following conditions exists: | | | 2.1. Stairways from the second story open directly to the exterior of the building without entering the first floor; | | | 2.2. One of the two required means of egress discharges directly to the exterior from the second story level, and a self-closing door is installed at the top or bottom of the interior stair leading to the floor below; or | | | 2.3. An automatic residential sprinkler system shall be designed and installed in accordance with Section P2904 or NFPA 13D. |

Every sleeping or napping room in a family home child care shall have at least one operable window for emergency rescue.

| EXCEPTION: | Sleeping or napping rooms having doors leading to two separate means of egress, or a door leading directly to the exterior of the building. | | --- | --- |

Rooms or spaces containing a commercial-type cooking kitchen, boiler, maintenance shop, janitor closet, laundry, woodworking shop, flammable or combustible storage, or painting operation shall be separated from the family home child care area by at least 1-hour fire-resistant construction.

| EXCEPTION: | A fire-resistant separation shall not be required where the food preparation kitchen contains only a domestic cooking range, and the preparation of food does not result in the production of smoke or grease laden vapors. | | --- | --- |

Smoke alarms shall be installed in accordance with the requirements of new construction per Section R314. In addition to the required smoke alarms, a heat alarm shall be provided in each kitchen.

R331.2 Additional requirements for family home child care with thirteen to sixteen children. In addition to the requirements of Section 331.1 the provisions of this section shall apply to family home child care with thirteen to sixteen children.

R331.2.1 Illumination in the event of power failure. In addition to illumination requirements of Section R311.7.9, an artificial light source that activates upon termination of building power supply shall be installed at all interior stairs serving child care areas.

R331.2.2 Exterior exit doors serving child care areas. Exterior exit doors serving child care areas shall comply with the requirements of Sections R311.2 and R311.3.

R331.3 Sprinklers. An automatic residential sprinkler system shall be designed and installed in accordance with Section P2904 or NFPA 13D.

| EXCEPTION: | Subject to approval of the code official, a sprinkler system is not required where all of the following conditions are met: | | --- | --- | | | 1. Child care areas are located on a floor within 4 feet of grade level; | | | 2. Each room used for child care shall have a door compliant with Section R311.2 and R311.3, leading directly to the exterior of the building. The exterior landing at the door shall comply with Section R311.3 but need not comply with Section R311.3.1. |

History

• Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 24-04-035, § 51-51-0331, filed 1/30/24, effective 3/15/24
• WSR 20-03-023, § 51-51-0331, filed 1/6/20, effective 7/1/20.

Wash. Admin. Code § 51-51-0332 Section R332—Protection against radon.

R332.1 Protection against radon. The radon control provisions of Appendix F of this code shall apply to buildings constructed in high radon potential counties (zone 1) designated in Table AF101(1). The radon control provisions of Appendix F of this code shall also apply to all buildings constructed using the provisions of Section R408.3 Unvented crawl space compliance method.

History

• Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 20-03-023, § 51-51-0332, filed 1/6/20, effective 7/1/20.

Wash. Admin. Code § 51-51-0333 Section R333—Lofts.

R333.1 General. Where provided in dwelling units or sleeping units, lofts shall comply with this code as modified by Sections R333.1 through R333.5. Lofts constructed in compliance with this section shall be considered a portion of the story below. Such lofts shall not contribute to the number of stories as regulated by this code.

| EXCEPTION: | Lofts need not comply with Section R333 where they meet any of the following conditions: | | --- | --- | | | 1. The loft has a maximum depth of less than 3 feet (914 mm). | | | 2. The loft has a floor area of less than 35 square feet (3.3 m2). | | | 3. The loft is not provided with a permanent means of egress. |

R333.2 Loft limitations. Lofts shall comply with the following conditions:

1. The loft floor area shall be less than 70 square feet (6.5 m2).

2. The loft ceiling height shall not exceed 7 feet (2134 mm) for more than one half of the loft floor area.

The provisions of Sections R333.3 through R333.5 shall not apply to lofts that do not comply with Items 1 and 2 of this section.

R333.3 Loft ceiling height. The ceiling height below a loft shall not be less than 7 feet (2134 mm). The ceiling height above the finished floor of the loft shall not be less than 3 feet (914 mm). Portions of the loft with a sloped ceiling measuring less than 3 feet (914 mm) from the finished floor to the finished ceiling shall not contribute to the loft floor area.

R333.4 Loft area. The aggregate area of all lofts and mezzanines within a room shall comply with Section R325.3.

| EXCEPTION: | The area of a single loft located within a dwelling unit or sleeping unit equipped with an automatic sprinkler system in accordance with Section P2904 shall not be greater than two-thirds of the area of the room in which it is located, provided that no other lofts or mezzanines are open to the room in which the loft is located. | | --- | --- |

R333.5 Permanent egress for lofts. Where a permanent means of egress is provided for lofts, the means of egress shall comply with Section R311 as modified by Section R333.5.1.

R333.5.1 Ceiling height at loft means of egress. A minimum ceiling height of 3 feet (914 mm) shall be provided for the entire width of the means of egress from the loft.

History

• Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 23-23-104, § 51-51-0333, filed 11/15/23, effective 3/16/24
• WSR 23-02-058, 23-12-104, and 23-20-024, § 51-51-0333, filed 1/3/23, 6/7/23, and 9/25/23, effective 3/15/24.

Wash. Admin. Code § 51-51-0334 Section R334—Stationary fuel cell power systems.

R334.1 General. Stationary fuel cell power systems in new and existing buildings and structures shall comply with Section 1206 of the International Fire Code.

History

• Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 23-02-058, 23-12-104, and 23-20-024, § 51-51-0334, filed 1/3/23, 6/7/23, and 9/25/23, effective 3/15/24.

Wash. Admin. Code § 51-51-0403 Section R403—Footings.

R403.1.1 Minimum size. The minimum width, W, and thickness, T, for concrete footings shall be in accordance with Tables R403.1(1) through R403.1(3) and Figure R403.1(1) or R403.1.3, as applicable, but not less than 12 inches (305 mm) in width and 6 inches (152 mm) in depth. The footing width shall be based on the load-bearing value of the soil in accordance with Table R401.4.1. Footing projections, P, shall be not less than 2 inches (51 mm) and shall not exceed the thickness of the footing. Footing thickness and projection for fireplaces shall be in accordance with Section R1001. The size of footings supporting piers and columns shall be based on the tributary load and allowable soil pressure in accordance with Table R401.4.1. Footings for wood foundations shall be in accordance with the details set forth in Section R403.2, and Figures R403.1(2) and R403.1(3). Footings for precast foundation shall be in accordance with the details set forth in Section R403.4, Table R403.4, and Figures R403.4(1) and R403.4(2).

| EXCEPTION: | Light-frame construction shall be permitted to have minimum footing size in accordance with Figures R403.1.1(1) through R403.1.1(4) in lieu of that determined by Table R403.1(1). | | --- | --- |

Figure R403.1.1(1)

Alternative Minimum Footing Size for Light-Frame Construction a,b,c,d,e,f,g,h,i

20 PSF Snow Load

| | | --- |

| Notes: | a | The minimum footing size is based on the following assumptions: Material weights per Section R301.2.2.2.1 and soil density = 120 pcf. Wood-framed walls = 10 foot; crawlspace stem wall = 6 inches × 36 inches; basement wall = 8 inches × 120 inches. Total load (TL) equal to the maximum of three load combinations: LC1=D+L, LC2=D+S and LC3=D=0.75(L+S), where D=dead load, L=live load, S=snow load. TL=max (LC1, LC2, LC3). | | --- | --- | --- | | | b | Use tributary span of floor and roof. Figure may be used to size exterior and interior footings. | | | c | Add 4 feet to tributary floor span for each wood-framed wall above first level (i.e., 4 feet for 2-story, 8 feet for 3-story). | | | d | Multiply floor span by 1.25 for interior footings supporting continuous joists. | | | e | Multiply footing width by (1500 psf/capacity) for soil capacity other than 1500 psf. See Section R403.1.1 for thickness. | | | f | Dashed line may be used for interior footing size only. | | | g | Use footing size indicated on line above the span combination used. | | | h | For span combinations above the upper line, a design professional is required. | | | i | Interpolation between footing sizes is allowed. Extrapolation is not allowed. |

Figure R403.1.1(2)

Alternative Minimum Footing Size for Light-Frame Construction a,b,c,d,e,f,g,h,i

30 PSF Snow Load

| | | --- |

| Notes: | a | The minimum footing size is based on the following assumptions: Material weights per Section R301.2.2.2.1 and soil density = 120 pcf. Wood-framed walls = 10 foot; crawlspace stem wall = 6 inches × 36 inches; basement wall = 8 inches × 120 inches. Total load (TL) equal to the maximum of three load combinations: LC1=D+L, LC2=D+S and LC3=D=0.75(L+S), where D=dead load, L=live load, S=snow load. TL=max (LC1, LC2, LC3). | | --- | --- | --- | | | b | Use tributary span of floor and roof. Figure may be used to size exterior and interior footings. | | | c | Add 4 feet to tributary floor span for each wood-framed wall above first level (i.e., 4 feet for 2-story, 8 feet for 3-story). | | | d | Multiply floor span by 1.25 for interior footings supporting continuous joists. | | | e | Multiply footing width by (1500 psf/capacity) for soil capacity other than 1500 psf. See Section R403.1.1 for thickness. | | | f | Dashed line may be used for interior footing size only. | | | g | Use footing size indicated on line above the span combination used. | | | h | For span combinations above the upper line, a design professional is required. | | | i | Interpolation between footing sizes is allowed. Extrapolation is not allowed. |

Figure R403.1.1(3)

Alternative Minimum Footing Size for Light-Frame Construction a,b,c,d,e,f,g,h,i

50 PSF Snow Load

| | | --- |

| Notes: | a | The minimum footing size is based on the following assumptions: Material weights per Section R301.2.2.2.1 and soil density = 120 pcf. Wood-framed walls = 10 foot; crawlspace stem wall = 6 inches × 36 inches; basement wall = 8 inches × 120 inches. Total load (TL) equal to the maximum of three load combinations: LC1=D+L, LC2=D+S and LC3=D=0.75(L+S), where D=dead load, L=live load, S=snow load. TL=max (LC1, LC2, LC3). | | --- | --- | --- | | | b | Use tributary span of floor and roof. Figure may be used to size exterior and interior footings. | | | c | Add 4 feet to tributary floor span for each wood-framed wall above first level (i.e., 4 feet for 2-story, 8 feet for 3-story). | | | d | Multiply floor span by 1.25 for interior footings supporting continuous joists. | | | e | Multiply footing width by (1500 psf/capacity) for soil capacity other than 1500 psf. See Section R403.1.1 for thickness. | | | f | Dashed line may be used for interior footing size only. | | | g | Use footing size indicated on line above the span combination used. | | | h | For span combinations above the upper line, a design professional is required. | | | i | Interpolation between footing sizes is allowed. Extrapolation is not allowed. |

Figure R403.1.1(4)

Alternative Minimum Footing Size for Light-Frame Construction a,b,c,d,e,f,g,h,i

70 PSF Snow Load

| | | --- |

| Notes: | a | The minimum footing size is based on the following assumptions: Material weights per Section R301.2.2.2.1 and soil density = 120 pcf. Wood-framed walls = 10 foot; crawlspace stem wall = 6 inches × 36 inches; basement wall = 8 inches × 120 inches. Total load (TL) equal to the maximum of three load combinations: LC1=D+L, LC2=D+S and LC3=D=0.75(L+S), where D=dead load, L=live load, S=snow load. TL=max (LC1, LC2, LC3). | | --- | --- | --- | | | b | Use tributary span of floor and roof. Figure may be used to size exterior and interior footings. | | | c | Add 4 feet to tributary floor span for each wood-framed wall above first level (i.e., 4 feet for 2-story, 8 feet for 3-story). | | | d | Multiply floor span by 1.25 for interior footings supporting continuous joists. | | | e | Multiply footing width by (1500 psf/capacity) for soil capacity other than 1500 psf. See Section R403.1.1 for thickness. | | | f | Dashed line may be used for interior footing size only. | | | g | Use footing size indicated on line above the span combination used. | | | h | For span combinations above the upper line, a design professional is required. | | | i | Interpolation between footing sizes is allowed. Extrapolation is not allowed. |

History

• Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 23-23-104, § 51-51-0403, filed 11/15/23, effective 3/16/24
• WSR 23-02-058, 23-12-104, and 23-20-024, § 51-51-0403, filed 1/3/23, 6/7/23, and 9/25/23, effective 3/15/24
• WSR 20-03-023, § 51-51-0403, filed 1/6/20, effective 7/1/20. Statutory Authority: RCW 19.27.031, 19.27.074 and chapter 19.27 RCW. WSR 19-03-036, § 51-51-0403, filed 1/7/19, effective 7/1/19. Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 16-03-025, § 51-51-0403, filed 1/11/16, effective 7/1/16. Statutory Authority: RCW 19.27.031 and chapters 19.27 and 34.05 RCW. WSR 13-04-068, § 51-51-0403, filed 2/1/13, effective 7/1/13. Statutory Authority: Chapter 19.27 RCW. WSR 10-24-061, § 51-51-0403, filed 11/29/10, effective 7/1/11. Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 10-03-098, § 51-51-0403, filed 1/20/10, effective 7/1/10. Statutory Authority: RCW 19.27.190, 19.27.020, and chapters 19.27 and 34.05 RCW. WSR 08-01-103, § 51-51-0403, filed 12/18/07, effective 4/1/08. Statutory Authority: RCW 19.27.074, 19.27.020, and chapters 19.27 and 34.05 RCW. WSR 07-01-090, § 51-51-0403, filed 12/19/06, effective 7/1/07.

Wash. Admin. Code § 51-51-0404 Reserved.

History

• Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 23-02-058, 23-12-104, and 23-20-024, § 51-51-0404, filed 1/3/23, 6/7/23, and 9/25/23, effective 3/15/24
• WSR 20-21-041, § 51-51-0404, filed 10/13/20, effective 11/13/20
• WSR 16-03-025, § 51-51-0404, filed 1/11/16, effective 7/1/16. Statutory Authority: RCW 19.27.031 and chapters 19.27 and 34.05 RCW. WSR 13-04-068, § 51-51-0404, filed 2/1/13, effective 7/1/13. Statutory Authority: Chapter 19.27 RCW. WSR 10-24-061, § 51-51-0404, filed 11/29/10, effective 7/1/11. Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 10-03-098, § 51-51-0404, filed 1/20/10, effective 7/1/10. Statutory Authority: RCW 19.27.190, 19.27.020, and chapters 19.27 and 34.05 RCW. WSR 08-01-102, § 51-51-0404, filed 12/18/07, effective 4/1/08. Statutory Authority: RCW 19.27.074, 19.27.020, and chapters 19.27 and 34.05 RCW. WSR 07-01-090, § 51-51-0404, filed 12/19/06, effective 7/1/07.

Wash. Admin. Code § 51-51-0408 Section R408—Under-floor space.

R408.1 Ventilation. The under-floor space between the bottom of the floor joists and the earth under any building (except space occupied by a basement) shall have ventilation openings through foundation walls or exterior walls. A ground cover of six mil (0.006 inch thick) black polyethylene or approved equal shall be laid over the ground within crawl spaces. The ground cover shall be overlapped 6 inches (152 mm) minimum at the joints and shall extend to the foundation wall.

| EXCEPTION: | The ground cover may be omitted in crawl spaces if the crawl space has a concrete slab floor with a minimum thickness of 2 inches (51 mm). | | --- | --- |

R408.2 Openings for under-floor ventilation. The minimum net area of ventilation openings shall not be less than 1 square foot (0.0929 m2) for each 300 square feet (28 m2) of under-floor area. Required openings shall be evenly placed to provide cross ventilation of the space except one side of the building shall be permitted to have no ventilation openings. Ventilation openings shall be covered for their height and width with any of the following materials provided that the least dimension of the covering shall not exceed 1/4 inch (6.4 mm), and operational louvers are permitted:

1. Perforated sheet metal plates not less than 0.070 inch (1.8 mm) thick.

2. Expanded sheet metal plates not less than 0.047 inch (1.2 mm) thick.

3. Cast-iron grill or grating.

4. Extruded load-bearing brick vents.

5. Hardware cloth of 0.035 inch (0.89 mm) wire or heavier.

6. Corrosion-resistant wire mesh, with the least dimension being 1/8 inch (3.2 mm).

| EXCEPTION: | The total area of ventilation openings shall be permitted to be reduced to 1/1,500 of the under-floor area where the ground surface is covered with an approved Class I vapor retarder material and the required openings are placed to provide cross ventilation of the space. The installation of operable louvers shall not be prohibited. If the installed ventilation is less than 1/300, or if operable louvers are installed, a radon vent shall be installed to originate from a point between the ground cover and soil. The radon vent shall be installed in accordance with the requirements of Appendix AF (Radon) of this code. | | --- | --- |

R408.3 Unvented crawl space. Ventilation openings in under-floor spaces specified in Section R408.2 shall not be required where:

1. Exposed earth is covered with a continuous Class I vapor retarder. Joints of the vapor retarder shall overlap by 6 inches (152 mm) and shall be sealed or taped. The edges of the vapor retarder shall extend at least 6 inches (152 mm) up the stem wall and shall be attached and sealed to the stem wall; and a radon system shall be installed that meets the requirements of Appendix AF (Radon) of this code.

2. Continuously operated mechanical exhaust ventilation is provided at a rate equal to 1 cubic foot per minute (0.47 L/s) for each 50 square feet (4.7 m2) of crawlspace floor area. Exhaust ventilation shall terminate to the exterior.

| EXCEPTION: | Plenum in existing structures complying with Section M1601.5, if under-floor space is used as a plenum. | | --- | --- |

R408.8 Under-floor vapor retarder. This section is not adopted.

History

• Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 23-23-104, § 51-51-0408, filed 11/15/23, effective 3/16/24
• WSR 23-02-058, 23-12-104, and 23-20-024, § 51-51-0408, filed 1/3/23, 6/7/23, and 9/25/23, effective 3/15/24. Statutory Authority: RCW 19.27.074, 19.27.020, and 19.27.031. WSR 14-24-055, § 51-51-0408, filed 11/25/14, effective 5/1/15. Statutory Authority: RCW 19.27.031 and chapters 19.27 and 34.05 RCW. WSR 13-04-068, § 51-51-0408, filed 2/1/13, effective 7/1/13. Statutory Authority: Chapter 19.27 RCW. WSR 10-18-036, § 51-51-0408, filed 8/25/10, effective 9/25/10. Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 10-03-098, § 51-51-0408, filed 1/20/10, effective 7/1/10. Statutory Authority: RCW 19.27.074, 19.27.020, and chapters 19.27 and 34.05 RCW. WSR 07-01-090, § 51-51-0408, filed 12/19/06, effective 7/1/07.

Wash. Admin. Code § 51-51-0501 Reserved.

History

• Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 16-03-025, § 51-51-0501, filed 1/11/16, effective 7/1/16. Statutory Authority: RCW 19.27.031 and chapters 19.27 and 34.05 RCW. WSR 13-04-068, § 51-51-0501, filed 2/1/13, effective 7/1/13.

Wash. Admin. Code § 51-51-0502 Section R502—Reserved.

History

• Statutory Authority: RCW 19.27.031 and chapters 19.27 and 34.05 RCW. WSR 13-04-068, § 51-51-0502, filed 2/1/13, effective 7/1/13. Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 10-03-098, § 51-51-0502, filed 1/20/10, effective 7/1/10.

Wash. Admin. Code § 51-51-0507 Section R507—Decks.

TABLE R507.3.1

MINIMUM FOOTING SIZE FOR DECKS

| LIVE OR GROUND SNOW LOAD (psf) | TRIBUTARY AREA (sq.ft.) | LOAD-BEARING VALUE OF SOILSacd (psf) | | | | | | | | | | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | | 1500e | 2000e | ≥ 3000e | | | | | | | | | | Side of a square footing (inches) | Diameter of a round footing (inches) | Thicknessf (inches) | Side of a square footing (inches) | Diameter of a round footing (inches) | Thicknessf (inches) | Side of a square footing (inches) | Diameter of a round footing (inches) | Thicknessf (inches) | | | | 60 Live or 70 Ground Snow Load | 5 | 7 | 8 | 6 | 7 | 8 | 6 | 7 | 8 | 6 | | 20 | 12 | 14 | 6 | 11 | 13 | 6 | 9 | 10 | 6 | | | 40 | 18 | 20 | 6 | 15 | 17 | 6 | 12 | 14 | 6 | | | 60 | 21 | 24 | 8 | 19 | 21 | 6 | 15 | 17 | 6 | | | 80 | 25 | 28 | 9 | 21 | 24 | 8 | 18 | 20 | 6 | | | 100 | 28 | 31 | 11 | 24 | 27 | 9 | 20 | 22 | 7 | | | 120 | 30 | 34 | 12 | 26 | 30 | 10 | 21 | 24 | 8 | | | 140 | 33 | 37 | 13 | 28 | 32 | 11 | 23 | 26 | 9 | | | 160 | 35 | 40 | 15 | 30 | 34 | 12 | 25 | 28 | 9 | |

| For SI: 1 inch = 25.4 mm, 1 square foot = 0.0929 m2, 1 pound per square foot = 0.0479 kPa. | | | --- | --- | | a. | Interpolation permitted, extrapolation not permitted. | | b. | Reserved. | | c. | Footing dimensions shall allow complete bearing of the post. | | d. | If the support is a brick or CMU pier, the footing shall have a minimum 2-inch projection on all sides. | | e. | Area, in square feet, of deck surface supported by post and footings. | | f. | Minimum thickness shall only apply to plain concrete footings, |

R507.4 Deck posts. For single-level decks, wood post size shall be in accordace with Table R507.4.

TABLE R507.4

DECK POST HEIGHT

| | | | TRIBUTARY AREAg,h (sq. ft.) | | | | | | | | | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | | | | | 20 | 40 | 60 | 80 | 100 | 120 | 140 | 160 | | LOADSb (psf) | POST SPECIESc | POST SIZEd | MAXIMUM DECK POST HEIGHTa (feet-inches) | | | | | | | | | 60 Live Load, ≤60 Ground Snow Load | Douglas Fire, Hem-fire, SPFe | 4 x 4 | 14-0 | 10-10 | 8-7 | 7-0 | 5-8 | 4-1 | NP | NP | | 4 x 6 | 14-0 | 13-10 | 11-1 | 9-5 | 8-2 | 7-3 | 6-4 | 5-4 | | | | 6 x 6 | 14-0 | 14-0 | 14-0 | 14-0 | 14-0 | 13-3 | 10-9 | 6-11 | | | | 8 x 8 | 14-0 | 14-0 | 14-0 | 14-0 | 14-0 | 14-0 | 14-0 | 14-0 | | | | Redwoodf, Western Cedarsf, Ponderosa Pinef, Red Pinef | 4 x 4 | 14-0 | 10-3 | 7-0 | NP | NP | NP | NP | NP | | | 4 x 6 | 14-0 | 13-6 | 10-6 | 8-4 | 5-10 | NP | NP | NP | | | | 6 x 6 | 14-0 | 14-0 | 14-0 | 14-0 | 11-11 | NP | NP | NP | | | | 8 x 8 | 14-0 | 14-0 | 14-0 | 14-0 | 14-0 | 14-0 | 14-0 | 14-0 | | | | 70 Ground Snow Load | Douglas Fire, Hem-fire, SPFe | 4 x 4 | 14-0 | 10-1 | 7-11 | 6-6 | 5-3 | 3-7 | NP | NP | | 4 x 6 | 14-0 | 12-10 | 10-3 | 8-9 | 7-7 | 6-8 | 5-10 | 4-11 | | | | 6 x 6 | 14-0 | 14-0 | 14-0 | 14-0 | 14-0 | 12-2 | 9-9 | 5-9 | | | | 8 x 8 | 14-0 | 14-0 | 14-0 | 14-0 | 14-0 | 14-0 | 14-0 | 14-0 | | | | Redwoodf, Western Cedarsf, Ponderosa Pinef, Red Pinef | 4 x 4 | 14-0 | 9-5 | 6-5 | NP | NP | NP | NP | NP | | | 4 x 6 | 14-0 | 12-6 | 9-8 | 7-7 | 5-3 | NP | NP | NP | | | | 6 x 6 | 14-0 | 14-0 | 14-0 | 14-0 | 10-8 | NP | NP | NP | | | | 8 x 8 | 14-0 | 14-0 | 14-0 | 14-0 | 14-0 | 14-0 | 14-0 | 14-0 | | |

| For SI: 1 inch = 25.4 mm, 1 foot = 304.8 mm, 1 square foot = 0.0929 m2, 1 pound per square foot = 0.0479 kPa, NP = Not permitted. | | | --- | --- | | a. | Measured from the underside of the beam to top of footing or pier. | | b. | 10 psf dead load. Snow load not assumed to be concurrent with live load. | | c. | No. 2 grade, wet service factor included. | | d. | Notched deck posts shall be sized to accommodate beam size in accordance with Section R507.5.2. | | e. | Includes incising factor. | | f. | Incising factor not included. | | g. | Area, in square feet, of deck surface supported by post and footing. | | h. | Interpolation permitted. Extrapolation not permitted. |

R507.5 Deck beams. Maximum allowable spans for wood deck beams, as shown in Figure R507.5, shall be in accordance with Table R507.5. Beam plies shall be fastened together with two rows of 10d (3-inch × 0.128-inch) nails minimum at 16 inches (406 mm) on center along each edge. Beams shall be permitted to cantilever at each end up to one-fourth of the actual beam span. Deck beams of other materials shall be permitted where designed in accordance with accepted engineering practices.

Tables R507.5(1) through R507.5(4) are not adopted.

TABLE R507.5

MAXIMUM DECK BEAM SPAN - 60 PSF LIVE LOAD or

70 PSF GROUND SNOW LOADc

| BEAM SPECIESd | BEAM SIZEe | EFFECTIVE DECK JOIST SPAN LENGTHa,i (feet) | | | | | | | | --- | --- | --- | --- | --- | --- | --- | --- | --- | | 6 | 8 | 10 | 12 | 14 | 16 | 18 | | | | | MAXIMUM DECK BEAM SPAN LENGTHa,b,f (feet-inches) | | | | | | | | | Douglas fir-larchg, Hem-firg, Spruce-pine-firg | 1-2×6 | 3-5 | 2-10 | 2-5 | 2-2 | 2-0 | 1-10 | 1-9 | | 1-2×8 | 4-7 | 3-8 | 3-2 | 2-10 | 2-7 | 2-5 | 2-4 | | | 1-2×10 | 5-8 | 4-9 | 4-1 | 3-8 | 3-4 | 3-1 | 2-11 | | | 1-2×12 | 6-7 | 5-8 | 5-0 | 4-6 | 4-1 | 3-10 | 3-7 | | | 2-2×6 | 5-2 | 4-6 | 4-0 | 3-5 | 3-1 | 2-10 | 2-7 | | | 2-2×8 | 6-11 | 6-0 | 5-3 | 4-7 | 4-1 | 3-8 | 3-5 | | | 2-2×10 | 8-5 | 7-4 | 6-6 | 5-10 | 5-2 | 4-9 | 4-5 | | | 2-2×12 | 9-10 | 8-6 | 7-7 | 6-11 | 6-4 | 5-9 | 5-4 | | | 3-2×6 | 6-6 | 5-7 | 5-0 | 4-7 | 4-2 | 3-9 | 3-5 | | | 3-2×8 | 8-8 | 7-6 | 6-8 | 6-1 | 5-6 | 5-0 | 4-7 | | | 3-2×10 | 10-7 | 9-2 | 8-2 | 7-6 | 6-11 | 6-4 | 5-10 | | | 3-2×12 | 12-4 | 10-8 | 9-7 | 8-9 | 8-1 | 7-7 | 7-1 | | | Redwoodh, Western Cedarsh, Ponderosa Pineh, Red Pineh | 1-2×6 | 3-6 | 2-11 | 2-6 | 2-3 | 2-0 | 1-11 | 1-9 | | 1-2×8 | 4-6 | 3-10 | 3-3 | 2-11 | 2-8 | 2-6 | 2-4 | | | 1-2×10 | 5-6 | 4-9 | 4-2 | 3-9 | 3-5 | 3-2 | 3-0 | | | 1-2×12 | 6-4 | 5-6 | 4-11 | 4-6 | 4-2 | 3-11 | 3-8 | | | 2-2×6 | 5-3 | 4-7 | 4-1 | 3-6 | 3-2 | 2-11 | 2-8 | | | 2-2×8 | 6-8 | 5-9 | 5-2 | 4-8 | 4-2 | 3-10 | 3-6 | | | 2-2×10 | 8-2 | 7-1 | 6-4 | 5-9 | 5-4 | 4-10 | 4-6 | | | 2-2×12 | 9-5 | 8-2 | 7-4 | 6-8 | 6-2 | 5-9 | 5-5 | | | 3-2×6 | 6-4 | 5-8 | 5-1 | 4-8 | 4-3 | 3-10 | 3-6 | | | 3-2×8 | 8-4 | 7-3 | 6-5 | 5-11 | 5-5 | 5-1 | 4-8 | | | 3-2×10 | 10-2 | 8-10 | 7-11 | 7-2 | 6-8 | 6-3 | 5-11 | | | 3-2×12 | 11-10 | 10-3 | 9-2 | 8-4 | 7-9 | 7-3 | 6-10 | |

| For SI: 1 inch = 25.4 mm, 1 foot = 304.8 mm, 1 pound per square foot = 0.0479 kPa, 1 pound = 0.454 kg. | | | --- | --- | | a. | Interpolation allowed. Extrapolation is not allowed. | | b. | Beams supporting a single span of joists with or without cantilever. | | c. | Dead load = 10 psf, L/Δ = 360 at mainspan, L/Δ = 180 at cantilever. Snow load not assumed to be concurrent with live load. | | d. | No. 2 grade, wet service factor included. | | e. | Beam depth shall be equal to or greater than the depth of intersecting joist for a flush beam connection. | | f. | Beam cantilevers are limited to the adjacent beam's span divided by 4. | | g. | Includes incising factor. | | h. | Incising factor not included. | | i. | Deck joist span as shown in Figure R507.5. | | j. | For calculation of effective joist span, the actual joist span length shall be multiplied by the joist span factor in accordance with Table R507.5(5). |

R507.6 Deck joists. Maximum allowable spans for wood deck joists, as shown in Figure R507.6, shall be in accordance with Table R507.6. The maximum joist spacing shall be limited by the decking materials in accordance with Table R507.7.

TABLE R507.6

MAXIMUM DECK JOIST SPANS

| LOADa (psf) | JOIST SPECIESb | JOIST SIZE | ALLOWABLE JOIST SPANb,c (feet-inches) | MAXIMUM CANTILEVERd,f (feet-inches) | | | | | | | | | | | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | | Joist Spacing (inches) | Adjacent Joist Back Spang (feet) | | | | | | | | | | | | | | 12 | 16 | 24 | 4 | 6 | 8 | 10 | 12 | 14 | 16 | 18 | | | | | 60 Live Load or 70 Ground Snow Load | Douglas fir-larche, Hem-fire, Spruce-pine-fire | 2×6 | 7-11 | 7-1 | 5-9 | 1-0 | 1-6 | NP | NP | NP | NP | NP | NP | | 2×8 | 10-5 | 9-5 | 7-8 | 1-0 | 1-6 | 2-0 | 2-1 | NP | NP | NP | NP | | | | 2×10 | 13-3 | 11-6 | 9-5 | 1-0 | 1-6 | 2-0 | 2-6 | 2-8 | NP | NP | NP | | | | 2×12 | 15-5 | 13-4 | 10-11 | 1-0 | 1-6 | 2-0 | 2-6 | 3-0 | 3-3 | NP | NP | | | | Redwoodf, Western Cedarsf, Ponderosa Pinef, Red Pinef | 2×6 | 7-4 | 6-8 | 5-10 | 1-0 | 1-4 | NP | NP | NP | NP | NP | NP | | | 2×8 | 9-8 | 8-10 | 7-4 | 1-0 | 1-6 | 1-11 | NP | NP | NP | NP | NP | | | | 2×10 | 12-4 | 11-0 | 9-0 | 1-0 | 1-6 | 2-0 | 2-6 | 2-6 | NP | NP | NP | | | | 2×12 | 14-9 | 12-9 | 10-5 | 1-0 | 1-6 | 2-0 | 2-6 | 3-0 | 3-0 | NP | NP | | |

| For SI: 1 inch = 25.4 mm, 1 foot = 304.8 mm, 1 pound per square foot = 0.0479 kPa, 1 pound = 0.454 kg, NP = Not permitted. | | | --- | --- | | a. | Dead load = 10 psf dead load. Snow load not assumed to be concurrent with live load. | | b. | No. 2 grade, wet service factor included. | | c. | L/Δ = 360 at main span. | | d. | L/Δ = 180 at cantilever with 220-pound point load applied to end. | | e. | Includes incising factor. | | f. | Incising factor not included. | | g. | Interpolation permitted. Extrapolation not permitted. |

R507.9.1.2 Band joist details. Band joists supporting a ledger shall be a minimum 2-inch-nominal (51 mm), solid-sawn, spruce-pine-fir or better lumber or minimum 1-inch (25 mm) nominal engineered wood rim boards in accordance with Section R502.1.7. Band joists shall bear fully on the primary structure capable of supporting all required loads.

TABLE R507.9.1.3(1)

DECK LEDGER CONNECTION TO BAND JOIST

| LOADc (psf) | JOIST SPANa (feet) | ON-CENTER SPACING OF FASTENERSb (inches) | | | | --- | --- | --- | --- | --- | | 1/2-inch diameter lag screw with 1/2-inch maximum sheathingd,e | 1/2-inch diameter bolt with 1/2-inch maximum sheathinge | 1/2-inch diameter bolt with 1-inch maximum sheathingf | | | | 60 Live Load or 70 Ground Snow Load | 6 | 22 | 36 | 35 | | 8 | 16 | 31 | 26 | | | 10 | 13 | 25 | 21 | | | 12 | 11 | 20 | 17 | | | 14 | 9 | 17 | 15 | | | 16 | 8 | 15 | 13 | | | 18 | 7 | 13 | 11 | |

| For SI: 1 inch = 25.4 mm, 1 foot = 304.8 mm, 1 pound per square foot = 0.0479 kPa. | | | --- | --- | | a. | Interpolation permitted. Extrapolation is not permitted. | | b. | Ledgers shall be flashed in accordance with Section R703.4 to prevent water from contacting the house band joist. | | c. | Dead load = 10 psf. Snow load shall not be assumed to act concurrently with live load. | | d. | The tip of the lag screw shall fully extend beyond the inside face of the band joist. | | e. | Sheathing shall be wood structural panel or solid sawn lumber. | | f. | Sheathing shall be permitted to be wood structural panel, gypsum board, fiberboard, lumber or foam sheathing. Up to 1/2-inch thickness of stacked washers shall be permitted to substitute for up to 1/2 inch of allowable sheathing thickness where combined with wood structural panel or lumber sheathing. |

R507.9.2 Deck lateral load connections. Lateral loads shall be transferred to the ground or to a structure capable of transmitting them to the ground. Where the lateral load connection is provided in accordance with Figure R507.9.2(1), hold-down tension devices shall be installed in not less than two locations per deck, within 24 inches of each end of the deck. Each device shall have an allowable stress design capacity of not less than 1500 pounds (6672 N). Where the lateral load connections are provided in accordance with Figure R507.9.2(2), the hold-down tension devices shall be installed in not less than four locations per deck, and each device shall have an allowable stress design capacity of not less than 750 pounds (3336 N).

| EXCEPTION: | Decks not more than 30 inches above grade at any point may be unattached. | | --- | --- |

TABLE R507.9.1.3(2)

PLACEMENT OF LAG SCREWS AND BOLTS IN DECK LEDGERS AND BAND JOISTS

| MINIMUM END AND EDGE DISTANCES AND SPACING BETWEEN ROWS | | | | | | --- | --- | --- | --- | --- | | | TOP EDGE | BOTTOM EDGE | ENDS | ROW SPACING | | Ledgera | 2 inchesd | 3/4 inch | 2 inchesb | 1 5/8 inchesb | | Band joistc | 3/4 inch | 2 inchese | 2 inchesb | 1 5/8 inchesb |

| For SI: | 1 inch = 25.4 mm. | | --- | --- | | a | Lag screws or bolts shall be staggered from the top to the bottom along the horizontal run of the deck ledger in accordance with Figure R507.9.1.3(1). | | b | Maximum 5 inches. | | c | For engineered rim joists, the manufacturer's recommendations shall govern. | | d | The minimum distance from bottom row of lag screws or bolts to the top edge of the ledger shall be in accordance with Figure R507.9.1.3(1). | | e | The 2 inches may be reduced to 3/4 inch when the band joist is directly supported by a mudsill, a header or by double top wall plates. |

History

• Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 23-23-104, § 51-51-0507, filed 11/15/23, effective 3/16/24
• WSR 23-02-058, 23-12-104, and 23-20-024, § 51-51-0507, filed 1/3/23, 6/7/23, and 9/25/23, effective 3/15/24
• WSR 21-16-006, § 51-51-0507, filed 7/22/21, effective 8/22/21
• WSR 20-21-041, § 51-51-0507, filed 10/13/20, effective 11/13/20
• WSR 20-03-023, § 51-51-0507, filed 1/6/20, effective 7/1/20
• WSR 16-03-025, § 51-51-0507, filed 1/11/16, effective 7/1/16. Statutory Authority: RCW 19.27.031 and chapters 19.27 and 34.05 RCW. WSR 13-04-068, § 51-51-0507, filed 2/1/13, effective 7/1/13.

Wash. Admin. Code § 51-51-0602 Section R602—Wood wall framing.

R602.1.1.1 Used sawn lumber. Used sawn lumber identified with a grade mark, in good condition and devoid of areas of decay shall be assumed to meet the requirements of Section 602.1.1 or shall comply with the following:

1. Dimensional lumber not identified with a grade mark that has a nominal thickness of 2 inches with a nominal width of 6 inches, or less, shall be assumed to be spruce-pine-fir stud grade and shall have structural properties assigned in accordance with current adopted standards. All other dimensional lumber shall be assumed to be hem-fir No. 2 grade and shall have structural properties assigned in accordance with current adopted standards.

R602.9 Cripple walls. Foundation cripple walls shall be framed of studs not smaller than the studding above. When exceeding 4 feet (1219 mm) in height, such walls shall be framed of studs having the size required for an additional story.

Cripple walls supporting bearing walls or exterior walls or interior braced wall panels as required in Sections R403.1.2 and R602.10.9.1 with a stud height less than 14 inches (356 mm) shall be continuously sheathed on one side with wood structural panels fastened to both the top and bottom plates in accordance with Table R602.3(1), or the cripple walls shall be constructed of solid blocking. All cripple walls shall be supported on continuous footings or foundations.

| EXCEPTION: | Footings supporting cripple walls used to support interior braced wall panels as required in Sections R403.1.2 and R602.10.9.1 shall be continuous for the required length of the cripple wall and constructed beyond the cripple wall for a minimum distance of 4 inches and a maximum distance of the footing thickness. The footings extension is not required at intersections with other footings. | | --- | --- |

R602.10.10 Cripple wall bracing. Cripple walls shall be constructed in accordance with Section R602.9 and braced in accordance with this section. Cripple walls supporting bearing walls or exterior walls or interior braced wall panels as required in Section R403.1.2 shall be braced with the length and method of bracing used for the wall above in accordance with Tables R602.10.3(1) and R602.10.3(3), and the applicable adjustment factors in Table R602.10.3(2) or R602.10.3(4), respectively, except the length of the cripple wall bracing shall be multiplied by a factor of 1.15.

Where gypsum wall board is not used on the inside of the cripple wall bracing, the length adjustments for the elimination of the gypsum wallboard, or equivalent, shall be applied as directed in Tables R602.10.3(2) and R602.10.3(4) to the length of cripple wall bracing required. This adjustment shall be taken in addition to the 1.15 increase.

History

• Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 20-21-041, § 51-51-0602, filed 10/13/20, effective 11/13/20
• WSR 20-03-023, § 51-51-0602, filed 1/6/20, effective 7/1/20
• WSR 16-03-025, § 51-51-0602, filed 1/11/16, effective 7/1/16. Statutory Authority: RCW 19.27.031 and chapters 19.27 and 34.05 RCW. WSR 13-04-068, § 51-51-0602, filed 2/1/13, effective 7/1/13. Statutory Authority: Chapter 19.27 RCW. WSR 10-18-036, § 51-51-0602, filed 8/25/10, effective 9/25/10. Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 10-03-098, § 51-51-0602, filed 1/20/10, effective 7/1/10. Statutory Authority: RCW 19.27.190, 19.27.020, and chapters 19.27 and 34.05 RCW. WSR 08-01-102, § 51-51-0602, filed 12/18/07, effective 4/1/08. Statutory Authority: RCW 19.27.074, 19.27.020, and chapters 19.27 and 34.05 RCW. WSR 07-01-090, § 51-51-0602, filed 12/19/06, effective 7/1/07.

Wash. Admin. Code § 51-51-0608 Reserved.

History

• Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 23-02-058, 23-12-104, and 23-20-024, § 51-51-0608, filed 1/3/23, 6/7/23, and 9/25/23, effective 3/15/24
• WSR 20-03-023, § 51-51-0608, filed 1/6/20, effective 7/1/20.

Wash. Admin. Code § 51-51-0609 Section R609—Exterior windows and doors.

R609.3 Testing and labeling. Exterior windows and sliding doors shall be tested by an approved independent laboratory, and bear a label identifying manufacturer, performance characteristics and approved inspection agency to indicate compliance with AAMA/WDMA/CSA 101/I.S.2/A440. Exterior side-hinged doors shall be tested and labeled as conforming to AAMA/WDMA/CSA 101/I.S.2/A440 or AMD 100, or comply with Section R609.5.

| EXCEPTIONS: | 1. Decorative glazed openings. | | --- | --- | | | 2. Custom exterior windows and doors manufactured by a small business shall be exempt from all testing requirements in Section R609 provided they meet the applicable provisions of Chapter 24 of the International Building Code. |

History

• Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 16-03-025, § 51-51-0609, filed 1/11/16, effective 7/1/16.

Wash. Admin. Code § 51-51-0612 Reserved.

History

• Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 16-03-025, § 51-51-0612, filed 1/11/16, effective 7/1/16. Statutory Authority: RCW 19.27.031 and chapters 19.27 and 34.05 RCW. WSR 13-04-068, § 51-51-0612, filed 2/1/13, effective 7/1/13. Statutory Authority: Chapter 19.27 RCW. WSR 10-18-036, § 51-51-0612, filed 8/25/10, effective 9/25/10. Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 10-03-098, amended and recodified as § 51-51-0612, filed 1/20/10, effective 7/1/10. Statutory Authority: RCW 19.27.074, 19.27.020, and chapters 19.27 and 34.05 RCW. WSR 07-01-090, § 51-51-0613, filed 12/19/06, effective 7/1/07.

Wash. Admin. Code § 51-51-0702 Section R702—Interior covering.

R702.5 Other finishes. Wood veneer paneling and hardboard paneling shall be placed on wood or cold-formed steel framing spaced not more than 16 inches (406 mm) on center. Wood veneer and hardboard paneling less than 1/4-inch (6 mm) nominal thickness shall not have less than a 3/8-inch (10 mm) gypsum board or gypsum panel product backer. Wood veneer paneling not less than 1/4-inch (6 mm) nominal thickness shall conform to ANSI/HPVA HP-1. Hardboard paneling shall conform to CPA/ANSI A135.5. All structural panel components within the conditioned space such as plywood, particle board, wafer board and oriented strand board shall be identified as "EXPOSURE 1," "EXTERIOR" or "HUD-APPROVED."

History

• Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 16-03-025, § 51-51-0702, filed 1/11/16, effective 7/1/16
• WSR 10-03-098, § 51-51-0702, filed 1/20/10, effective 7/1/10.

Wash. Admin. Code § 51-51-0703 Section R703—Exterior covering.

R703.1.1 Water resistance. The exterior wall envelope shall be designed and constructed in a manner that prevents the accumulation of water within the wall assembly by providing a water-resistant barrier behind the exterior veneer as required by Section R703.2 and a means of draining water that enters the assembly to the exterior. Protection against condensation in the exterior wall assembly shall be provided in accordance with Section R702.7 of this code.

| EXCEPTIONS: | 1. A weather-resistant exterior wall envelope shall not be required over concrete or masonry walls designed in accordance with Chapter 6 and flashed according to Section R703.4 or R703.8. | | --- | --- | | | 2. Compliance with the requirements for a means of drainage, and the requirements of Sections R703.2 and R703.4, shall not be required for an exterior wall envelope that has been demonstrated to resist wind-driven rain through testing of the exterior wall envelope, including joints, penetrations and intersections with dissimilar materials, in accordance with ASTM E 331 under the following conditions: | | | 2.1. Exterior wall envelope test assemblies shall include at least one opening, one control joint, one wall/eave interface and one wall sill. All tested openings and penetrations shall be representative of the intended end-use configuration. | | | 2.2. Exterior wall envelope test assemblies shall be at least 4 feet (1219 mm) by 8 feet (2438 mm) in size. | | | 2.3. Exterior wall assemblies shall be tested at a minimum differential pressure of 6.24 pounds per square foot (299Pa). | | | 2.4. Exterior wall envelope assemblies shall be subjected to a minimum test exposure duration of 2 hours. | | | 3. The requirement for a means of drainage shall not be construed to mean an air space cavity under the exterior cladding for an exterior wall clad with panel or lapped siding made of plywood, engineered wood, hardboard, or fiber cement. A water-resistive barrier as required by Section R703.2 will be required on exterior walls. |

The exterior wall envelope design shall be considered to resist wind-driven rain where the results of testing indicate that water did not penetrate control joints in the exterior wall envelope; joints at the perimeter of opening penetration; or intersections of terminations with dissimilar materials.

R703.10.2 Lap siding. Fiber-cement lap siding having a maximum width of 12 inches (305 mm) shall comply with the requirements of ASTM C 1186, Type A, minimum Grade II or ISO 8336, Category A, minimum Class 2. Lap siding shall be lapped a minimum of 1 1/4 inches (32 mm) and lap siding shall be installed in accordance with the manufacturer's installation instructions or shall be designed to comply with Section R703.1. Lap siding courses shall be installed with the fastener heads exposed or concealed, in accordance with Table R703.3(1) or approved manufacturer's instructions.

History

• Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 23-02-058, 23-12-104, and 23-20-024, § 51-51-0703, filed 1/3/23, 6/7/23, and 9/25/23, effective 3/15/24
• WSR 20-21-041, § 51-51-0703, filed 10/13/20, effective 11/13/20
• WSR 20-03-023, § 51-51-0703, filed 1/6/20, effective 7/1/20
• WSR 16-03-025, § 51-51-0703, filed 1/11/16, effective 7/1/16. Statutory Authority: RCW 19.27.031 and chapters 19.27 and 34.05 RCW. WSR 13-04-068, § 51-51-0703, filed 2/1/13, effective 7/1/13. Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 10-03-098, § 51-51-0703, filed 1/20/10, effective 7/1/10. Statutory Authority: RCW 19.27.190, 19.27.020, and chapters 19.27 and 34.05 RCW. WSR 08-01-102, § 51-51-0703, filed 12/18/07, effective 4/1/08.

Wash. Admin. Code § 51-51-0806 Section R806—Reserved.

History

• Statutory Authority: RCW 19.27.031 and chapters 19.27 and 34.05 RCW. WSR 13-04-068, § 51-51-0806, filed 2/1/13, effective 7/1/13. Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 10-03-098, § 51-51-0806, filed 1/20/10, effective 7/1/10. Statutory Authority: RCW 19.27.074, 19.27.020, and chapters 19.27 and 34.05 RCW. WSR 07-01-090, § 51-51-0806, filed 12/19/06, effective 7/1/07.

Wash. Admin. Code § 51-51-0903 Section R903—Weather protection.

R903.4.1 Secondary (emergency overflow) drains or scuppers. Where roof drains are required, secondary emergency overflow drains or scuppers shall be provided where the roof perimeter construction extends above the roof in such a manner that water will be entrapped if the primary drains allow buildup for any reason. Overflow drains having the same size as the roof drains shall be installed with the inlet flow line located 2 inches (51 mm) above the low point of the roof, or overflow scuppers having three times the size of the roof drains and having a minimum opening height of 4 inches (102 mm) shall be installed in the adjacent parapet walls with the inlet flow located 2 inches (51 mm) above the low point of the roof served. The installation and sizing of overflow drains, leaders and conductors shall comply with Sections 1101 and 1103 of the state plumbing code. Overflow drains shall discharge to an approved location.

History

• Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 16-03-025, § 51-51-0903, filed 1/11/16, effective 7/1/16. Statutory Authority: RCW 19.27.031 and chapters 19.27 and 34.05 RCW. WSR 13-04-068, § 51-51-0903, filed 2/1/13, effective 7/1/13. Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 10-03-098, § 51-51-0903, filed 1/20/10, effective 7/1/10.

Wash. Admin. Code § 51-51-1001 Section R1001—Masonry fireplaces.

R1001.7.1 Damper. Masonry fireplaces shall be equipped with a ferrous metal damper located at least 8 inches (203 mm) above the top of the fireplace opening. Dampers shall be installed in the fireplace or the chimney venting the fireplace, and shall be operable from the room containing the fireplace.

Fireplaces shall be provided with each of the following:

1. Tightly fitting flue dampers, operated by a readily accessible manual or approved automatic control.

| EXCEPTION: | Fireplaces with gas logs shall be installed in accordance with the International Mechanical Code Section 901, except that the standards for liquefied petroleum gas installations shall be NFPA 58 (Liquefied Petroleum Gas Code) and NFPA 54 (National Fuel Gas Code). | | --- | --- |

2. An outside source for combustion air ducted into the firebox. The duct shall be at least 6 square inches (3870 mm2), and shall be provided with an operable outside air duct damper.

3. Site built fireplaces shall have tight-fitting glass or metal doors, or a flue draft induction fan or as approved for minimizing back-drafting. Factory built fireplaces shall use doors listed for the installed appliance.

History

• Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 23-23-104, § 51-51-1001, filed 11/15/23, effective 3/16/24. Statutory Authority: RCW 19.27.031 and chapters 19.27 and 34.05 RCW. WSR 13-04-068, § 51-51-1001, filed 2/1/13, effective 7/1/13. Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 10-03-098, § 51-51-1001, filed 1/20/10, effective 7/1/10.

Wash. Admin. Code § 51-51-1002 Section R1002—Masonry heaters.

R1002.2 Installation.Masonry heaters shall be installed in accordance with this section and shall be a masonry heater type approved by the department of ecology. Masonry heaters shall comply with one of the following:

1. Masonry heaters shall comply with the requirements of ASTM E 1602; or

2. Masonry heaters shall be listed and labeled in accordance with UL 1482 or CEN 15250 and installed in accordance with the manufacturer's installation instructions.

R1002.2.1 Combustion air and doors. Masonry heaters shall be provided with both of the following:

1. Primary combustion air ducted from the outside of the structure to the appliance.

2. Tight-fitting ceramic glass or metal doors. Flue dampers, when provided, shall have an external control and when in the closed position shall have a net free area of not less than five percent of the flue cross sectional area.

History

• Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 23-23-104, § 51-51-1002, filed 11/15/23, effective 3/16/24
• WSR 16-03-025, § 51-51-1002, filed 1/11/16, effective 7/1/16. Statutory Authority: RCW 19.27.031 and chapters 19.27 and 34.05 RCW. WSR 13-04-068, § 51-51-1002, filed 2/1/13, effective 7/1/13.

Wash. Admin. Code § 51-51-1004 Section R1004—Factory-built fireplaces.

R1004.1.1 Emission standards for factory-built fireplaces. No new or used factory-built fireplace shall be installed in Washington state unless it is certified and labeled in accordance with procedures and criteria specified in ASTM E2558 Standard Test Method for determining particulate matter emission from fires in wood burning fireplaces.

To certify an entire fireplace model line, the internal assembly shall be tested to determine its particulate matter emission performance. Retesting and recertifying is required if the design and construction specifications of the fireplace model line internal assembly change. Testing for certification shall be performed by a Washington state department of ecology (DOE) approved and U.S. Environmental Protection Agency (EPA) accredited laboratory.

R1004.1.2 Emission standards for certified masonry and concrete fireplaces. Masonry and concrete fireplace model lines certified to Washington State Building Code Standard 31-2 prior to July 1, 2013, may retain certification provided the design and construction specifications of the fireplace model line internal assembly do not change.

History

• Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 20-21-041, § 51-51-1004, filed 10/13/20, effective 11/13/20. Statutory Authority: RCW 19.27.031 and chapters 19.27 and 34.05 RCW. WSR 13-04-068, § 51-51-1004, filed 2/1/13, effective 7/1/13. Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 04-01-109, § 51-51-1004, filed 12/17/03, effective 7/1/04.

Wash. Admin. Code § 51-51-1006 Section R1006—Exterior air supply.

R1006.4 Passageway. This section is not adopted.

R1006.6 Solid fuel-burning appliances and fireplaces. Solid fuel-burning appliances and fireplaces shall be provided with tight-fitting metal or ceramic glass doors, and:

1. A source from outside the structure of primary combustion air, connected to the appliance in accordance with manufacturer's specification. The air inlet shall originate at a point below the fire box. The duct shall be 4 inches (102 mm) or greater in diameter, not exceed 20 feet (6096 mm) in length, and be installed in accordance with manufacturer's instructions; or

2. The appliance and manufacturer's recommended combustion air supply, as an installed unit, shall be certified by an independent testing laboratory to have passed Test No. 11-Negative Pressure Test, Section 12.3, of ULC S627-M1984 "Space Heaters for Use with Solid Fuels," modified as follows:

Negative pressure of 8 Pascal shall be initially established with the chamber sealed and the air supply, if not directly connected to the appliance, closed off.

The air supply if not directly connected to the appliance, shall then be opened.

The maximum allowable air exchange rate from chamber leakage and intentional air supply for the unit (appliance with combustion air supply) in the test chamber is 3.5 air changes per hour, or 28 cfm (cubic feet of air per minute), whichever is less.

| EXCEPTION: | Combustion air may be supplied to the room in which the solid fuel burning appliance is located in lieu of direct ducting, provided that one of the following conditions is met: | | --- | --- | | | 1. The solid fuel-burning appliance is part of a central heating plant and installed in an unconditioned space in conformance with the International Mechanical Code; or | | | 2. The solid fuel-burning appliance is installed in existing construction directly on a concrete floor or surrounded by masonry materials as in a fireplace. The combustion air terminus shall be located as close to the solid fuel-burning appliance as possible and shall be provided with a barometric damper or equivalent. The combustion air source shall be specified by the manufacturer or no less than 4 inches (102 mm) in diameter or the equivalent in area or as approved. |

History

• Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 23-23-104, § 51-51-1006, filed 11/15/23, effective 3/16/24
• WSR 20-03-023, § 51-51-1006, filed 1/6/20, effective 7/1/20. Statutory Authority: RCW 19.27.031 and chapters 19.27 and 34.05 RCW. WSR 13-04-068, § 51-51-1006, filed 2/1/13, effective 7/1/13. Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 10-03-098, § 51-51-1006, filed 1/20/10, effective 7/1/10.

Wash. Admin. Code § 51-51-1201 Section M1201—General.

M1201.1 Scope. The provisions of Chapters 12 through 24 shall regulate the design, installation, maintenance, alteration and inspection of mechanical systems that are permanently installed and utilized to provide control of environmental conditions within buildings. These chapters shall also regulate those mechanical systems, system components, equipment and appliances specifically addressed in this code.

| EXCEPTION: | The standards for liquefied petroleum gas installations shall be the 2011 Edition of NFPA 58 (Liquefied Petroleum Gas Code) and the 2012 Edition of ANSI Z223.1/NFPA 54 (National Fuel Gas Code). | | --- | --- |

M1201.3 Construction documents. The plans and specifications shall show in sufficient detail pertinent data and features of the materials, equipment and systems as herein governed including, but not limited to: Design criteria, size and type of apparatus and equipment, systems and equipment controls, provisions for combustion air to fuel-burning appliances, and other pertinent data to indicate conformance with the requirements of this code.

M1201.4 Testing. At the discretion of the building official, flow testing may be required to verify that the mechanical system(s) satisfies the requirements of this code. Specific testing required by other sections of this code shall be performed. Flow testing may be performed using flow hoods measuring at the intake or exhaust points of the system, in-line pitot tube, or pitot-traverse type measurement systems in the duct, short-term tracer gas measurements, or other means approved by the building official.

History

• Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 23-23-104, § 51-51-1201, filed 11/15/23, effective 3/16/24. Statutory Authority: RCW 19.27.031 and chapters 19.27 and 34.05 RCW. WSR 13-04-068, § 51-51-1201, filed 2/1/13, effective 7/1/13. Statutory Authority: RCW 19.27.074, 19.27.020, and chapters 19.27 and 34.05 RCW. WSR 07-01-090, § 51-51-1201, filed 12/19/06, effective 7/1/07.

Wash. Admin. Code § 51-51-1301 Section M1301—General.

M1301.2 Identification. Each length of pipe and tubing and each pipe fitting utilized in a mechanical system shall bear the identification of the manufacturer.

| EXCEPTION: | The manufacturer identification for fittings and pipe nipples shall be on each piece or shall be printed on the fitting or nipple packaging or provided documentation. | | --- | --- |

History

• Statutory Authority: RCW 19.27.031 and chapters 19.27 and 34.05 RCW. WSR 13-04-068, § 51-51-1301, filed 2/1/13, effective 7/1/13.

Wash. Admin. Code § 51-51-1302 Section M1302—Reserved.

History

• Statutory Authority: RCW 19.27.031 and chapters 19.27 and 34.05 RCW. WSR 13-04-068, § 51-51-1302, filed 2/1/13, effective 7/1/13. Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 10-03-098, § 51-51-1302, filed 1/20/10, effective 7/1/10.

Wash. Admin. Code § 51-51-1307 Section M1307—Appliance installation.

M1307.2 Anchorage of appliances. Appliances designed to be fixed in position shall be fastened or anchored in an approved manner. Thermal storage units shall be anchored or strapped to resist horizontal displacement caused by earthquake motion in accordance with one of the following:

1. Anchorage and strapping shall be designed to resist a horizontal force equal to one-third of the operating weight of the water storage tank, acting in any horizontal direction.

2. The anchorage strapping shall be in accordance with the appliance manufacturer's recommendations.

Seismic anchorage and strapping of water heaters shall be in accordance with Section 507.2 of the state plumbing code.

History

• Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 16-03-025, § 51-51-1307, filed 1/11/16, effective 7/1/16.

Wash. Admin. Code § 51-51-1413 Section M1413—Evaporative cooling equipment.

M1413.1 General. Evaporative cooling equipment and appliances shall comply with UL 1995 or UL/CSA/ANCE 60335-2-40 and shall be installed:

1. In accordance with the manufacturer's instructions.

2. On level platforms in accordance with M1305.1.3.1.

3. So that openings in exterior walls are flashed in accordance with Section R703.4.

4. So as to protect the potable water supply in accordance with Section 603 of the state plumbing code.

5. So that air intake opening locations are in accordance with Section R303.5.1.

History

• Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 23-23-104, § 51-51-1413, filed 11/15/23, effective 3/16/24
• WSR 16-03-025, § 51-51-1413, filed 1/11/16, effective 7/1/16.

Wash. Admin. Code § 51-51-1415 Section M1415—Reserved.

History

• Statutory Authority: RCW 19.27.031 and chapters 19.27 and 34.05 RCW. WSR 13-04-068, § 51-51-1415, filed 2/1/13, effective 7/1/13. Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 10-03-098, § 51-51-1415, filed 1/20/10, effective 7/1/10.

Wash. Admin. Code § 51-51-1501 Reserved.

History

• Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 10-03-098, § 51-51-1501, filed 1/20/10, effective 7/1/10. Statutory Authority: RCW 19.27.190, 19.27.020, and chapters 19.27 and 34.05 RCW. WSR 08-01-102, § 51-51-1501, filed 12/18/07, effective 4/1/08.

Wash. Admin. Code § 51-51-1503 Section M1503—Domestic cooking exhaust equipment.

M1503.2.1 Open-top broiler exhaust. Domestic open-top broiler units shall be provided with a metal exhaust hood, having a minimum thickness of 0.0157 inch (0.3950 mm) (No. 28 gage). Such hoods shall be installed with a clearance of not less than 1/4 inch (6.4 mm) between the hood and the underside of combustible material or cabinets. A clearance of not less than 24 inches (610 mm) shall be maintained between the cooking surface and the combustible material or cabinets. The hood width shall not be less than the width of the broiler unit and shall extend over the entire unit.

| EXCEPTIONS: | 1. Broiler units that incorporate an integral exhaust system, and that are listed and labeled for use without an exhaust hood, shall not be required to have an exhaust hood. | | --- | --- | | | 2. Broiler units permanently installed outside the building envelope and having the cooking surface at least 5 feet below a 1-hour fire resistance rated ceiling shall not be required to have an exhaust hood. |

M1503.3 Exhaust discharge. Domestic cooking exhaust equipment shall discharge to the outdoors through a duct. The duct shall have a smooth interior surface, shall be airtight, shall be equipped with a backdraft damper and shall be independent of all other exhaust systems. Ducts serving domestic cooking exhaust equipment shall not terminate in an attic or crawl space or areas inside the building.

| EXCEPTION: | Where installed in accordance with the manufacturer's instructions, and where continuous local exhaust is provided in an enclosed kitchen in accordance with Table M1505.4.4.1, listed and labeled ductless range hoods shall not be required to discharge to the outdoors. | | --- | --- |

M1503.5 Kitchen exhaust rates. Where domestic kitchen cooking appliances are provided with exhaust equipment, the fans shall be sized in accordance with Section M1505.4.4.1.

History

• Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 23-02-058, 23-12-104, and 23-20-024, § 51-51-1503, filed 1/3/23, 6/7/23, and 9/25/23, effective 3/15/24
• WSR 20-21-041, § 51-51-1503, filed 10/13/20, effective 11/13/20.

Wash. Admin. Code § 51-51-1504 Section 1504—Exhaust ducts and exhaust openings.

M1504.3 Exhaust openings. Air exhaust openings shall terminate as follows:

1. Not less than 3 feet (914 mm) from property lines.

2. Not less than 3 feet (914 mm) from gravity air intake openings, operable windows and doors.

3. Not less than 10 feet (3048 mm) from mechanical air intake openings except where either of the following apply:

3.1. The exhaust opening is located not less than 3 feet (914 mm) above the air intake opening.

3.2. The exhaust opening is part of a factory-built intake/exhaust combination termination fitting installed in accordance with the manufacturer's instructions, and the exhaust air is drawn from a living space.

4. Openings shall comply with Sections R303.5.2 and R303.6.

History

• Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 20-03-023, § 51-51-1504, filed 1/6/20, effective 7/1/20.

Wash. Admin. Code § 51-51-1505 Section M1505—Mechanical ventilation.

M1505.1 General. Where local exhaust or whole-house mechanical ventilation is provided, the ventilation system shall be designed in accordance with this section.

| EXCEPTION: | Alternate balanced whole-house ventilation systems and local exhaust systems designed and commissioned in accordance with ASHRAE 62.2 are permitted. | | --- | --- |

M1505.4 Whole-house mechanical ventilation system. Each dwelling unit shall be equipped with a ventilation system. The whole-house mechanical ventilation systems shall be designed in accordance with Sections M1505.4.1 through M1505.4.4.

M1505.4.1 System design. The whole-house ventilation system shall consist of one or more supply fans, one or more exhaust fans, or an ERV/HRV with integral fans, associated ducts and controls. Whole-house mechanical ventilation system supply and exhaust fans shall meet the requirements of Sections M1505.4.1.2, M1505.4.1.3, M1505.4.1.4, and M1505.4.1.5. Local exhaust fans are permitted to serve as part of the whole-house ventilation system when provided with the proper controls in accordance with Section M1505.4.2. The systems shall be designed and installed to exhaust and/or supply the minimum outdoor airflow rates required by Section M1505.4.3 as modified by whole-house ventilation system coefficients in Section M1505.4.3.1 where applicable. The whole-house ventilation system shall operate continuously at the minimum ventilation rate required by Section M1505.4.2 unless configured with intermittent off controls in accordance with Section M1505.4.3.2.

M1505.4.1.1 Whole-house system component requirements. Whole-house ventilation supply and exhaust fans specified in this section shall have a minimum efficacy as prescribed in the Washington State Energy Code. Design and installation of the system or equipment shall be carried out in accordance with manufacturers' installation instructions. Whole-house ventilation fans shall be rated for sound at no less than the minimum airflow rate required by Section M1505.4.3.1. Ventilation fans shall be rated for sound at a maximum of 1.0 sone. This sound rating shall be at a minimum of 0.1 in. w.c. (25 Pa) static pressure in accordance with HVI procedures specified in Sections M1505.4.1.2 and M1505.4.1.3.

| EXCEPTION: | HVAC air handlers, ERV/HRV units, and remote mounted fans need not meet the sound requirements. To be considered for this exception, a remote mounted fan must be mounted outside the habitable spaces, bathrooms, toilets, and hallways, and there must be at least 4 feet (1.3 m) of ductwork between the fan and the intake grille. | | --- | --- |

The whole-house supply fan shall provide ducted outdoor ventilation air to each habitable space within the residential unit.

| EXCEPTION: | Interior joining spaces provided with a 30 cfm whole-house transfer fan or a permanent opening with an area of not less than 8 percent of the floor area of the interior adjoining space but not less than 25 square feet do not require ducted outdoor ventilation air to be supplied directly to the space. Whole-house transfer fans shall meet the sone rating of Section M1505.4.1.1 and shall have whole-house ventilation controls that comply with Section M1505.4.2. | | --- | --- |

M1505.4.1.2 Exhaust fans. Exhaust fans required shall be ducted directly to the outside. Exhaust air outlets shall be designed to limit the pressure difference to the outside and equipped with backdraft dampers or motorized dampers in accordance with the Washington State Energy Code. Exhaust fans shall be tested and rated in accordance with the airflow and sound rating procedures of the Home Ventilating Institute (HVI 915, HVI Loudness Testing and Rating Procedure, HVI 916, HVI Airflow Test Procedure, and HVI 920, HVI Product Performance Certification Procedure, as applicable). Exhaust fans required in this section may be used to provide local ventilation. Bathroom exhaust fans that are designed for intermittent exhaust airflow rates higher than the continuous exhaust airflow rates in Table M1505.4.3.2 shall be provided with occupancy sensors or humidity sensors to automatically override the fan to the high speed airflow rate. The exhaust fans shall be tested and the testing results shall be submitted and posted in accordance with Section M1505.4.1.6.

M1505.4.1.3 Supply fans. Supply fans used in meeting the requirements of this section shall supply outdoor air from intake openings in accordance with the International Mechanical Code Sections 401.4 and 401.5. When designed for intermittent off operation, supply systems shall be equipped with motorized dampers in accordance with the Washington State Energy Code. Supply fans shall be tested and rated in accordance with the airflow and sound rating procedures of the Home Ventilating Institute (HVI 915, HVI Loudness Testing and Rating Procedure, HVI 916, HVI Airflow Test Procedure, and HVI 920, HVI Product Performance Certification Procedure, as applicable). Where outdoor air is provided by supply fan systems the outdoor air shall be filtered. The filter shall be accessible for regular maintenance and replacement. The filter shall have a Minimum Efficiency Rating Value (MERV) of at least 8.

M1505.4.1.4 Balanced whole-house ventilation system. A balanced whole-house ventilation system shall include both supply and exhaust fans. The supply and exhaust fans shall have airflow that is within 10 percent of each other. The tested and balanced total mechanical exhaust airflow rate is within 10 percent or 5 cfm, whichever is greater, of the total mechanical supply airflow rate. The flow rate test results shall be submitted and posted in accordance with Section M1505.4.1.7. The exhaust fan shall meet the requirements of Section M1505.4.1.2. The supply fan shall meet the requirements of Section M1505.4.1.3. Balanced ventilation systems with both supply and exhaust fans in a packaged product, such as an ERV/HRV shall meet the requirements of HVI 920, as applicable. Local exhaust systems that are not a component of the whole-house mechanical ventilation system are exempt from the balanced airflow calculation.

M1505.4.1.5 Furnace integrated supply. Systems using space heating and/or cooling air handler fans for outdoor air supply distribution are not permitted.

| EXCEPTION: | Air handler fans shall have multispeed or variable speed supply airflow control capability with a low speed operation not greater than 25 percent of the rated supply airflow capacity during ventilation only operation. Outdoor air intake openings must meet the provisions of Sections R303.5 and R303.6 and must include a motorized damper that is activated by the whole-house ventilation system controller. The motorized damper must be controlled to maintain the outdoor airflow intake airflow within 10 percent of the whole-house mechanical exhaust airflow rate. The flow rate for the outdoor air intake must be tested and verified at the minimum ventilation fan speed and the maximum heating or cooling fan speed. The results of the test shall be submitted and posted in accordance with Section M1505.4.1.7. | | --- | --- |

M1505.4.1.6 Testing. Whole-house mechanical ventilation systems shall be tested, balanced and verified to provide a flow rate not less than the minimum required by Sections M1505.4.3 and M1505.4.4.1. Testing shall be performed according to the ventilation equipment manufacturer's instructions, or by using a flow hood, flow grid, or other airflow measuring device at the mechanical ventilation fan's inlet terminals, outlet terminals or grilles or in the connected ventilation ducts. Where required by the building official, testing shall be conducted by an approved third party. A written report of the results of the test shall be signed by the party conducting the test and provided to the building official and be posted in the dwelling unit per Section M1505.4.1.7.

M1505.4.1.7 Certificate. A permanent certificate shall be completed by the mechanical contractor, test and balance contractor or other approved party and posted on a wall in the space where the furnace is located, a utility room, or an approved location inside the building. When located on an electrical panel, the certificate shall not cover or obstruct the visibility of the circuit directory label, service disconnect label, or other required labels. The certificate shall list the flow rate determined from the delivered airflow of the whole-house mechanical ventilation system as installed and the type of mechanical whole-house ventilation system used to comply with Section M1505.4.3.1.

M1505.4.2 System controls. The whole-house mechanical ventilation system shall be provided with controls that comply with the following:

1. The whole-house ventilation system shall be controlled with manual switches, timers or other means that provide for automatic operation of the ventilation system that are readily accessible by the occupant;

2. Whole-house mechanical ventilation system shall be provided with controls that enable manual override off of the system by the occupant during periods of poor outdoor air quality. Controls shall include permanent text or a symbol indicating their function. Recommended control permanent labeling to include text similar to the following: "Leave on unless outdoor air quality is very poor." Manual controls shall be readily accessible by the occupant;

3. Whole-house ventilation systems shall be configured to operate continuously except where intermittent off controls and sizing are provided in accordance with Section M1505.4.3.2.

M1505.4.3 Mechanical ventilation rate. The whole-house mechanical ventilation system shall provide outdoor air at a continuous rate as determined in accordance with Table M1505.4.3(1) or Equation 15-1.

Equation 15-1

Ventilation rate in cubic feet per minute = (0.01 × total square foot area of house) + [7.5 × (number of bedrooms + 1)] but not less than 30 cfm for each dwelling unit

Table M1505.4.3(1)

Whole-House Mechanical Ventilation Airflow Rate

| | Number of Bedrooms | | | | | | --- | --- | --- | --- | --- | --- | | Dwelling Unit Floor Area (square feet) | 0 - 1 | 2 | 3 | 4 | 5 or more | | | Airflow in cfm | | | | | | < 500 | 30 | 30 | 35 | 45 | 50 | | 501 - 1,000 | 30 | 35 | 40 | 50 | 55 | | 1,001 - 1,500 | 30 | 40 | 45 | 55 | 60 | | 1,501 - 2,000 | 35 | 45 | 50 | 60 | 65 | | 2,001 - 2,500 | 40 | 50 | 55 | 65 | 70 | | 2,501 - 3,000 | 45 | 55 | 60 | 70 | 75 | | 3,001 - 3,500 | 50 | 60 | 65 | 75 | 80 | | 3,501 - 4,000 | 55 | 65 | 70 | 80 | 85 | | 4,001 - 4,500 | 60 | 70 | 75 | 85 | 90 | | 4,501 - 5,000 | 65 | 75 | 80 | 90 | 95 |

M1505.4.3.1 Ventilation quality adjustment. The minimum whole-house ventilation rate from Section 1505.4.3 shall be adjusted by the system coefficient in Table M1505.4.3(2) based on the system type not meeting the definition of a balanced whole-house ventilation system and/or not meeting the definition of a distributed whole-house ventilation system.

Qv = Qr * Csystem

(Equation 15-2)

| Where: | | | | --- | --- | --- | | Qv | = | Quality-adjusted ventilation airflow rate in cubic feet per minute (cfm). | | Qr | = | Ventilation airflow rate, cubic feet per minute (cfm) from Equation 15-1 or Table M1505.4.3(1). | | Csystem | = | System coefficient from Table 1505.4.3(2). |

Table M1505.4.3(2)

System Coefficient (Csystem)

| System Type | Distributed | Not Distributed | | --- | --- | --- | | Balanced | 1.0 | 1.25 | | Not balanced | 1.25 | 1.5 |

M1505.4.3.2 Intermittent off operation. Whole-house mechanical ventilation systems shall be provided with advanced controls that are configured to operate the system with intermittent off operation shall operate for a least two hours in each four-hour segment. The whole-house ventilation airflow rate determined in accordance with Section M1505.4.3 as corrected by Section M1505.4.3.1 is multiplied by the factor determined in accordance with Table M1505.4.3.2.

Table M1505.4.3.2

Intermittent Off Whole-House Mechanical Ventilation Rate Factorsa,b

| Run-time % in Each 4-hour Segment | 50% | 66% | 75% | 100% | | --- | --- | --- | --- | --- | | Factora | 2 | 1.5 | 1.3 | 1.0 |

a. For ventilation system run-time values between those given, the factors are permitted to be determined by interpolation.

b. Extrapolation beyond the table is prohibited.

M1505.4.4 Local exhaust rates.Local exhaust systems shall be designed to have the capacity to exhaust the minimum airflow rate determined in accordance with Table M1505.4.4.1. If the local exhaust fan is included in the whole-house ventilation system, in accordance with Section 1505.4.1, then the exhaust fan shall be controlled to operate as specified in Section M1505.4.2.

M1505.4.4.1 Local exhaust. Bathrooms, toilet rooms, and kitchens shall include a local exhaust system. Such local exhaust systems shall have the capacity to exhaust the minimum airflow rate in accordance with Table M1505.4.4.1. Fans required by this section shall be provided with controls that enable manual override or automatic occupancy sensor, humidity sensor, timer controls, or pollutant sensor controls. An "on/off" switch shall meet this requirement for manual controls. Manual fan controls shall be readily accessible in the room served by the fan.

Table M1505.4.4.1

Minimum Local Exhaust Rates

| Area to Be Exhausted | Exhaust Rates | | | --- | --- | --- | | Intermittent | Continuous | | | Open Kitchens | In accordance with Section M1505.4.4.3 | Not Permitted | | Enclosed Kitchens | In accordance with Section M1505.4.4.3 | 5 ACH based on kitchen volume | | Bathrooms - Toilet rooms | 50 cfm | 20 cfm |

M1505.4.4.2 Local exhaust fans. Exhaust fans shall meet the following criteria:

1. Exhaust fans shall be tested and rated in accordance with the airflow and sound rating procedures of the Home Ventilating Institute (HVI 915, HVI Loudness Testing and Rating Procedure, HVI 916, HVI Airflow Test Procedure, and HVI 920, HVI Product Performance Certification Procedure).

2. Fan airflow rating and duct system shall be designed and installed to deliver at least the exhaust airflow required by Table M1505.4.4.1. The airflows required refer to the delivered airflow of the system as installed and tested using a flow hood, flow grid, or other airflow measurement device. Local exhaust systems shall be tested, balanced, and verified to provide a flow rate not less than the minimum required by this section.

3. Design and installation of the system or equipment shall be carried out in accordance with manufacturers' installation instructions.

4. Intermittent local exhaust systems serving kitchens shall be rated for sound at a maximum of 3 sones at one or more airflow settings not less than 100 cfm at a static pressure not less than that determined at working speed as specified in HVI 916 Section 7.2.

5. Continuous local exhaust systems serving kitchens shall be rated for sound at a maximum of 1 sone at one or more airflow settings not less than 100 cfm at a static pressure not less than that determined at working speed as specified in HVI 916 Section 7.2.

| EXCEPTIONS: | 1. The installed airflow is not required to be field-verified where an exhaust airflow rating at a pressure of 0.25 in. w.g. is used, provided the duct sizing meets the prescriptive requirements of Table M1505.4.4.2. | | --- | --- | | | 2. Remote mounted fans need not meet sound requirements. To be considered for this exception, a remote mounted fan shall be mounted outside the kitchen, and there shall be at least 4 feet (1 m) of ductwork between the fan and the intake grille. |

Table M1505.4.4.2

Prescriptive Exhaust Duct Sizing

| Fan Tested cfm at 0.25 inches w.g. | Minimum Flex Diameter | Maximum Length in Feet | Minimum Smooth Diameter | Maximum Length in Feet | Maximum Elbowsa | | --- | --- | --- | --- | --- | --- | | 50 | 4 inches | 25 | 4 inches | 70 | 3 | | 50 | 5 inches | 90 | 5 inches | 100 | 3 | | 50 | 6 inches | No Limit | 6 inches | No Limit | 3 | | 80 | 4 inchesb | NA | 4 inches | 20 | 3 | | 80 | 5 inches | 15 | 5 inches | 100 | 3 | | 80 | 6 inches | 90 | 6 inches | No Limit | 3 | | 100 | 5 inchesb | NA | 5 inches | 50 | 3 | | 100 | 6 inches | 45 | 6 inches | No Limit | 3 | | 125 | 6 inches | 15 | 6 inches | No Limit | 3 | | 125 | 7 inches | 70 | 7 inches | No Limit | 3 |

a. For each additional elbow, subtract 10 feet from length.

b. Flex ducts of this diameter are not permitted with fans of this size.

M1505.4.4.3 Local intermittent kitchen exhaust system. Kitchen range hoods for domestic cooking appliances shall meet or exceed either the minimum airflow or the minimum capture efficiency in accordance with Table M1505.4.4.3. Capture efficiency ratings shall be determined in accordance with ASTM E3087.

| EXCEPTION: | Other intermittent kitchen exhaust fans, including downdraft, shall meet or exceed 300 cfm airflow. | | --- | --- |

Table M1505.4.4.3

Kitchen Range Hood Airflow Rates (cfm) and ASTM E3087 Capture Efficiency (CE) Ratings According to Kitchen Range Fuel Type

| Hood Over Electric Range | Hood Over Combustion Range | | --- | --- | | 65% CE or 160 cfm | 80% CE or 250 cfm |

M1505.4.4.3.1 Field verification and diagnostic testing for local intermittent kitchen exhaust system. The local exhaust system for kitchens shall be installed to comply with local mechanical exhaust requirements specified in Section M1505.4.4.3 and shall be field verified in accordance with the procedures below to confirm the model is rated by HVI or AHAM to comply with the following requirements:

1. Local intermittent exhaust systems for kitchens shall be tested and verified to provide a minimum airflow rate or capture efficiency required by Table M1505.4.4.3. Testing shall include verification of the maximum sound rating as specified in Section M1505.4.4.3.2. Testing for the intermittent kitchen exhaust systems shall occur with the whole-house ventilation system operating and with all dwelling unit or sleeping unit entry doors closed. Testing for exhaust systems that require makeup air in accordance with Section M1503.6 shall include verifying that the mechanical makeup air system is controlled to automatically start. Testing for exhaust systems that do not require mechanical makeup air in accordance with Section M1503.6 and that are exempt from pressurize equalization shall be tested with operable openings manually opened unless design exhaust airflow can be achieved with all operable openings closed. Testing shall be performed according to the ventilation equipment manufacturer's instructions, or by using a flow hood, flow grid, or other airflow measuring device. Where required by the building official, testing shall be conducted by an approved third party. A written report of the results of the test shall be signed by the party conducting the test and provided to the building official.

| EXCEPTION: | The installed airflow is not required to be field-verified where an exhaust airflow rating at a pressure of 0.25 in. w.g. is used, provided the duct sizing meets the prescriptive requirements of Table M1505.4.4.2. | | --- | --- |

2. The verification shall utilize certified rating data from the HVI Publication 911, AHAM-Certified Range Hood Directory, or another directory of certified product performance ratings approved by the code official for determining compliance. The verification procedure shall consist of visual inspection of the local intermittent kitchen exhaust system to verify and record the following information:

2.1. The manufacturer name and model number.

2.2. The model is listed in the HVI, AHAM, or equivalent directory.

2.3. The rated airflow value listed in the HVI, AHAM, or equivalent directory.

2.4. The sound rating value listed in the HVI, AHAM, or equivalent directory.

2.5. If the value for the rated airflow given in the directory is greater than or equal to the airflow requirements specified in Section M1505.4.4.3 and if the value for the sone rating given in the directory is less than or equal to the sone rating requirements specified in Section M1505.4.4.2, then the local intermittent kitchen exhaust system complies, otherwise the local intermittent kitchen exhaust system does not comply.

Reviser's note: The brackets and enclosed material in the text of the above section occurred in the copy filed by the agency.

Wash. Admin. Code § 51-51-1507 Reserved.

Reviser's note: The permanent filing 20-03-023 contained no amendments to this section.

Wash. Admin. Code § 51-51-1508 Section M1508—Reserved.

History

• Statutory Authority: RCW 19.27.031 and chapters 19.27 and 34.05 RCW. WSR 13-04-068, § 51-51-1508, filed 2/1/13, effective 7/1/13. Statutory Authority: RCW 19.27.031, 19.27.035, 19.27.074, and chapters 19.27 and 34.05 RCW. WSR 12-07-019, § 51-51-1508, filed 3/12/12, effective 4/12/12. Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 10-03-098, § 51-51-1508, filed 1/20/10, effective 7/1/10.

Wash. Admin. Code § 51-51-1600 Chapter 16—Duct systems.

M1601.1.1 Above-ground duct systems. Above-ground duct systems shall conform to the following:

1. Equipment connected to duct systems shall be designed to limit discharge air temperature to a maximum of 250°F (121°C).

2. Factory-made ducts shall be listed and labeled in accordance with UL 181 and installed in accordance with the manufacturer's instructions.

3. Fibrous duct construction shall conform to the SMACNA Fibrous Glass Duct Construction Standards or NAIMA Fibrous Glass Duct Construction Standards.

4. Field-fabricated and shop-fabricated metal and flexible duct constructions shall conform to the SMACNA HVAC Duct Construction Standards—Metal and Flexible, except as allowed by Table M1601.1.1. Galvanized steel shall conform to ASTM A 653.

5. Use of gypsum products to construct return air ducts or plenums is permitted, provided that the air temperature does not exceed 125°F (52°C) and exposed surfaces are not subject to condensation.

6. Duct systems shall be constructed of materials having a flame spread index not greater than 200.

7. Stud wall cavities and the spaces between solid floor joists shall not be used as a duct or an air plenum in new construction. For existing systems, stud wall cavities and the spaces between solid floor joists to be used as air plenums shall comply with the following:

7.1. These cavities or spaces shall not be used as a plenum for supply air.

7.2. These cavities or spaces shall not be part of a required fire-resistance-rated assembly.

7.3. Stud wall cavities shall not convey air from more than one floor level.

7.4. Stud wall cavities and joist-space plenums shall be isolated from adjacent concealed spaces by tight-fitting fire blocking in accordance with Section R302.11. Fireblocking materials used for isolation shall comply with Section R302.11.1.

7.5. Stud wall cavities in the outside walls of building envelope assemblies shall not be utilized as air plenums.

History

• Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 23-23-104, § 51-51-1600, filed 11/15/23, effective 3/16/24
• WSR 16-03-025, § 51-51-1600, filed 1/11/16, effective 7/1/16. Statutory Authority: RCW 19.27.031 and chapters 19.27 and 34.05 RCW. WSR 13-04-068, § 51-51-1600, filed 2/1/13, effective 7/1/13. Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 10-03-098, § 51-51-1600, filed 1/20/10, effective 7/1/10.

Wash. Admin. Code § 51-51-1700 Chapter 17—Combustion air.

M1701.1 Scope. Solid-fuel-burning appliances shall be provided with combustion air in accordance with the appliance manufacturer's installation instructions. Oil-fired appliances shall be provided with combustion air in accordance with NFPA 31. The methods of providing combustion air in this chapter do not apply to fireplaces, fireplace stoves and direct-vent appliances. The requirements for combustion and dilution air for gas-fired appliances shall be in accordance with Chapter 24.

Fireplaces shall comply with Chapter 10.

History

• Statutory Authority: RCW 19.27.031 and chapters 19.27 and 34.05 RCW. WSR 13-04-068, § 51-51-1700, filed 2/1/13, effective 7/1/13. Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 10-03-098, § 51-51-1700, filed 1/20/10, effective 7/1/10.

Wash. Admin. Code § 51-51-2000 Chapter 20—Boilers and water heaters.

Informational Note: Boilers, water heaters and pressure vessels are regulated by chapter 70.79 RCW and chapter 296-104 WAC in addition to the requirements of this code.

Section M2005.1 General. Water heaters shall be installed in accordance with Chapter 5 of the state plumbing code, the manufacturer's instructions and the requirements of this code. Water heaters installed in an attic shall comply with the requirements of Section M1305.1.2. Gas-fired water heaters shall comply with the requirements in Chapter 24. Domestic electric water heaters shall comply with UL 174. Oil-fired water heaters shall comply with UL 732. Thermal solar water heaters shall comply with Chapter 23 and UL 174. Solid fuel-fired water heaters shall comply with UL 2523.

History

• Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 23-23-104, § 51-51-2000, filed 11/15/23, effective 3/16/24
• WSR 16-03-025, § 51-51-2000, filed 1/11/16, effective 7/1/16. Statutory Authority: RCW 19.27.031 and chapters 19.27 and 34.05 RCW. WSR 13-04-068, § 51-51-2000, filed 2/1/13, effective 7/1/13. Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 04-01-109, § 51-51-2000, filed 12/17/03, effective 7/1/04.

Wash. Admin. Code § 51-51-2101 Section M2101—Hydronic piping systems installation.

M2101.3 Protection of potable water. The potable water system shall be protected from backflow in accordance with the provisions listed in Section 603 of the state plumbing code.

History

• Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 23-02-058, 23-12-104, and 23-20-024, § 51-51-2101, filed 1/3/23, 6/7/23, and 9/25/23, effective 3/15/24
• WSR 16-03-025, § 51-51-2101, filed 1/11/16, effective 7/1/16.

Wash. Admin. Code § 51-51-2103 Section M2103—Floor heating systems.

M2103.3 Piping joints. Copper and copper alloy systems shall be soldered in accordance with ASTM B 828. Fluxes for soldering shall be in accordance with ASTM B 813. Brazing fluxes shall be in accordance with AWS A5.31. Piping joints that are embedded shall be installed in accordance with the following requirements:

1. Steel pipe joints shall be welded.

2. Copper tubing shall be joined by brazing complying with Section 605 of the state plumbing code.

3. Polybutylene pipe and tubing joints shall be installed with socket-type heat-fused polybutylene fittings.

4. CPVC tubing shall be joined using solvent cement joints.

5. Polypropylene pipe and tubing joints shall be installed with socket-type heat-fused polypropylene fittings.

6. Cross-linked polyethylene (PEX) tubing shall be joined using cold expansion, insert or compression fittings.

7. Raised temperature polyethylene (PE-RT) tubing shall be joined using insert or compression fittings.

History

• Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 23-02-058, 23-12-104, and 23-20-024, § 51-51-2103, filed 1/3/23, 6/7/23, and 9/25/23, effective 3/15/24
• WSR 16-03-025, § 51-51-2103, filed 1/11/16, effective 7/1/16.

Wash. Admin. Code § 51-51-2105 Section M2105—Ground-source heat-pump system loop piping.

M2105.9 CPVC plastic pipe. Joints between CPVC plastic pipe or fittings shall be solvent-cemented in accordance with Section 605 of the state plumbing code. Threaded joints between fittings and CPVC plastic pipe shall be in accordance with Section M2105.9.1.

M2105.14 PVC plastic pipe. Joints between PVC plastic pipe or fittings shall be solvent-cemented in accordance with Section 605 of the state plumbing code. Threaded joints between fittings and PVC plastic pipe shall be in accordance with Section M2105.9.1.

M2105.18 Protection of potable water. Where ground-source heat-pump ground-loop systems have a connection to a potable water supply, the potable water system shall be protected from backflow in accordance with Section 603 of the state plumbing code.

M2105.19 Pipe penetrations. Openings for pipe penetrations in walls, floors and ceilings shall be larger than the penetrating pipe. Openings through concrete or masonry building elements shall be sleeved. The annular space surrounding pipe penetrations shall be protected in accordance with Section 312 of the state plumbing code.

History

• Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 23-02-058, 23-12-104, and 23-20-024, § 51-51-2105, filed 1/3/23, 6/7/23, and 9/25/23, effective 3/15/24
• WSR 16-03-025, § 51-51-2105, filed 1/11/16, effective 7/1/16.

Wash. Admin. Code § 51-51-2300 Section M2301—Solar thermal energy systems.

M2301.2.3 Pressure and temperature relief valves and system components. System components containing fluids shall be protected with temperature and pressure relief valves or pressure relief valves. Relief devices shall be installed in sections of the system so that a section cannot be valved off or isolated from a relief device. Direct systems and the potable water portion of indirect systems shall be equipped with a relief valve in accordance with Section 504 of the state plumbing code. For indirect systems, pressure relief valves in solar loops shall comply with SRCC 300. System components shall have a working pressure rating of not less than the setting of the pressure relief device.

M2301.2.5 Piping insulation. Piping shall be insulated in accordance with the requirements of the state energy code. Exterior insulation shall be protected from ultraviolet degradation. The entire solar loop shall be insulated. Where split-style insulation is used, the seam shall be sealed. Fittings shall be fully insulated.

M2301.4 Heat transfer gasses or liquids and heat exchangers.Essentially toxic transferfluids, ethylene glycol, flammable gasses and flammable liquids shall not be used as heat transfer fluids. Heat transfer gasses and liquids shall be rated to withstand the system's maximum design temperature under operating conditions without degradation. Heat exchangers used in solar thermal systems shall comply with Section 603.5.4 of the state plumbing code and SRCC 300.

Heat transfer fluids shall be in accordance with SRCC 300. The flash point of the heat transfer fluids utilized in solar thermal systems shall be not less than 50 degrees F above the design maximum nonoperating or no-flow temperature attained by the fluid in the collector.

M2301.7 Solar thermal systems for heating potable water. Where a solar thermal system heats potable water to supply a potable hot water distribution system, the solar thermal system shall be in accordance with Sections M2301.7.1, M2301.7.2 and the state plumbing code.

M2301.7.1 Indirect systems. Heat exchangers that are components of indirect solar thermal heating systems shall comply with the state plumbing code.

M2301.7.2 Direct systems. Where potable water is directly heated by a solar thermal system, the pipe, fittings, valves and other components that are in contact with the potable water in the solar heating system shall comply with the requirements of Chapter 6 of the state plumbing code.

History

• Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 23-23-104, § 51-51-2300, filed 11/15/23, effective 3/16/24
• WSR 16-03-025, § 51-51-2300, filed 1/11/16, effective 7/1/16. Statutory Authority: RCW 19.27.074, 19.27.020, and 19.27.031. WSR 14-24-092, § 51-51-2300, filed 12/1/14, effective 5/1/15.

Wash. Admin. Code § 51-51-2439 Reserved.

History

• Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 10-03-098, § 51-51-2439, filed 1/20/10, effective 7/1/10. Statutory Authority: RCW 19.27.190, 19.27.020, and chapters 19.27 and 34.05 RCW. WSR 08-01-102, § 51-51-2439, filed 12/18/07, effective 4/1/08.

Wash. Admin. Code § 51-51-2904 Section 2904—Dwelling unit fire-sprinkler systems.

P2904.1.1 Required sprinkler locations. Sprinklers shall be installed to protect all areas of a dwelling unit.

| EXCEPTIONS: | 1. Uninhabitable attics, crawl spaces and normally unoccupied concealed spaces that do not contain fuel-fired appliances do not require sprinklers. In uninhabitable attics, crawl spaces and normally unoccupied concealed spaces that contain fuel-fired equipment, a sprinkler shall be installed above the equipment; however, sprinklers shall not be required in the remainder of the space. | | --- | --- | | | 2. Clothes closets, linen closets and pantries not exceeding 24 square feet (2.2 m2) in area, with the smallest dimension not greater than 3 feet (915 mm) and having wall and ceiling surfaces of gypsum board. | | | 3. Bathrooms not more than 55 square feet (5.1 m2) in area. | | | 4. Garages; carports; exterior porches; unheated entry areas, such as mud rooms, that are adjacent to an exterior door; and similar areas. |

History

• Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 23-23-104, § 51-51-2904, filed 11/15/23, effective 3/16/24
• WSR 20-12-027, § 51-51-2904, filed 5/27/20, effective 7/1/20.

Wash. Admin. Code § 51-51-4400 Referenced standards.

AHAM

Association of Home Appliance Manufacturers

1111 19th St N.W., #402

Washington D.C. 20036

HRH-2-2019: Household Range Hoods.

M1505.4.4.2

Certified Range Hood Directory

M1505.4.4.3.1

ANCE

NMX-J-521/2-40-ANCE—2019/CAN/CSA-22.2 No. 60335-2-40—19/UL 60335- 2-40-2019 Household and Similar Electrical Appliances - Safety-Part 2-40: Particular Requirements for Electric Heat Pumps, Air-Conditioners and Dehumidifiers.

M1403.1, M1412.1, M1413.1

ANSI

LC 1/CSA 6.26—18: Fuel Gas Piping Systems Using Corrugated Stainless Steel Tubing (CSST).

G2414.5.4, G2411.3, G2415.5

403.5.5

ASHRAE

34—2019: Designation and Safety Classification of Refrigerants.

M1411.1

62.2-2019: Ventilation and Acceptable Indoor Air Quality in Residential Buildings.

M1505.1

ASTM

E2556/E2556M-2010 (2016): Standard Specification for Vapor Permeable Flexible Sheet Water-Resistive Barriers Intended for Mechanical Attachment.

M1411.1

E2558-2013: Standard Test Method for Determining Particulate Matter Emissions from Fires in Wood-burning Fireplaces.

R1004.1.1

E3087—18: Standard Test Method for Measuring Capture Efficiency of Domestic Range Hoods.

M1505.4.4.3.2, Table M1505.4.4.3

CSA

CAN/CSA/C22.2 No. 60335-2-40—2012 60335-2-40—2019

NMX-J-521/2-40-ANCE—2019/CAN/CSA-C22.2 No. 60335-2-40—19/UL 60335- 2-40-2019 Household and Similar Electric Appliances, Part 2-40-Safety: Particular Requirements for Electric Heat Pumps, Air-Conditioners and Dehumidifiers.

M2006.1

HVI

HVI Publication 911: Certified Home Ventilation Products Directory.

M1505.4.4.3.1

HVI Publication 915 (2016 with 2020 Update): Procedure for Loudness Rating of Residential Fan Products.

M1505.4.1.2, M1505.4.1.3, M1505.4.4.2

HVI Publication 916 (2015 with 2020 Update): Air Flow Test Procedure.

M1505.4.1.2, M1505.4.1.3, M1505.4.4.2

HVI Publication 920 (2020): Product Performance Certification Procedure Including Verification and Challenge.

M1505.4.1.2, M1505.4.1.3, M1505.4.1.5, M1505.4.4.2

UL

UL/CSA/ANCE 60335-2-40—2019 Household and Similar Electrical Appliances Safety-Part 2-40: Particular Requirements for Electrical Heat Pumps, Air Conditioners and Dehumidifiers.

M1403.1, M1412.1, M1413.1

History

• Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 23-23-104, § 51-51-4400, filed 11/15/23, effective 3/16/24
• WSR 23-02-058, 23-12-104, and 23-20-024, § 51-51-4400, filed 1/3/23, 6/7/23, and 9/25/23, effective 3/15/24
• WSR 20-21-041, § 51-51-4400, filed 10/13/20, effective 11/13/20
• WSR 20-03-023, § 51-51-4400, filed 1/6/20, effective 7/1/20
• WSR 16-03-025, § 51-51-4400, filed 1/11/16, effective 7/1/16. Statutory Authority: RCW 19.27.031 and chapters 19.27 and 34.05 RCW. WSR 13-04-068, § 51-51-4400, filed 2/1/13, effective 7/1/13. Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 10-03-098, amended and recodified as § 51-51-4400, filed 1/20/10, effective 7/1/10. Statutory Authority: RCW 19.27.074, 19.27.020, and chapters 19.27 and 34.05 RCW. WSR 07-01-090, § 51-51-4300, filed 12/19/06, effective 7/1/07. Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 04-01-109, § 51-51-4300, filed 12/17/03, effective 7/1/04.

Wash. Admin. Code § 51-51-4501 Chapter 45—Existing buildings and structures.

R4501 Scope and purpose.

R4501.1 General.Repairs, alterations, additions, and relocation of existing buildings and structures shall comply with the provisions of this code for new construction, except as modified by this chapter. Structural elements and systems shall comply with Section R102.7.1 and the provisions of this chapter.

History

• Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 23-02-058, 23-12-104, and 23-20-024, § 51-51-4501, filed 1/3/23, 6/7/23, and 9/25/23, effective 3/15/24.

Wash. Admin. Code § 51-51-4502 Section R4502—Compliance.

R4502.1 General. The work shall not cause the building or structure to become unsafe or adversely affect the performance of the building; shall not cause an existing mechanical or plumbing system to become unsafe, hazardous, insanitary, or overloaded; and unless expressly permitted by these provisions, shall not make the building any less compliant with this code or to any previously approved alternative arrangements than it was before the work was undertaken.

R4502.2 Structural. Structural elements and systems that are altered, repaired, or replaced shall comply with the structural provisions of this chapter and of Chapter 3 through Chapter 10 of the International Residential Code unless noted otherwise.

R4502.2.1 Minimum design loads. The minimum design loads for the structure shall be the loads applicable at the time the building was constructed. The minimum design loads for the structural components shall comply with the International Residential Code. Structural elements that are uncovered during the course of the alteration and that are found to be unsafe shall be repaired in accordance with Section R102.7.1.

R4502.2.2 Unreinforced masonry parapet bracing. Unreinforced masonry buildings located in Seismic Design Category D0, D1, or D2 shall have parapet bracing and wall anchors installed at the roofline whenever a reroofing permit is issued. Such parapet bracing and wall anchors shall be of an approved design unless an evaluation demonstrates compliance of the existing bracing and anchorage.

R4502.3 Smoke alarms. Smoke alarms shall be provided in accordance with Section R314.2.2.

R4502.4 Carbon monoxide alarms. Carbon monoxide alarms shall be provided in accordance with Section R315.2.2.

R4502.5 Replacement windows. Where an existing window, including the sash and glazed portion, or safety glazing is replaced, the replacement window or safety glazing shall comply with the requirements of Sections 4502.5.1 through 4502.5.5 as applicable.

R4502.5.1 Energy efficiency. Replacement windows shall comply with the requirements of the Washington State Energy Code-Residential.

R4502.5.2 Safety glazing. Replacement glazing in hazardous locations shall comply with the safety glazing requirements of Section R308.

R4502.5.3 Window fall protection. Window fall protection shall be installed in accordance with Section R312.2.

| EXCEPTION: | Where only the window glazing is being replaced. | | --- | --- |

R4502.5.4 Replacement windows for emergency escape and rescue openings. Replacement windows shall be exempt from Sections R310.2 and R310.4.4, provided that the replacement window meets the following conditions:

1. The replacement window is the manufacturer's largest standard size window that will fit within the existing frame or existing rough opening. The replacement window is of the same operating style as the existing window or a style that provides for an equal or greater window opening area than the existing window.

2. The replacement window is not part of a change of use.

R4502.5.5 Window opening control device and fall protection device height. Window opening control devices or fall protection device shall be located at a height in accordance with Section R310.1.1 or at as low a height as can be installed within the existing clear opening.

R4502.6 Flood hazard areas. Work performed in existing buildings located in a flood hazard area as established by Table R301.2 shall be subject to the provisions of Section R105.3.1.1.

History

• Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 23-23-104, § 51-51-4502, filed 11/15/23, effective 3/16/24
• WSR 23-02-058, 23-12-104, and 23-20-024, § 51-51-4502, filed 1/3/23, 6/7/23, and 9/25/23, effective 3/15/24.

Wash. Admin. Code § 51-51-4503 Section R4503—Repairs.

R4503.1 General.Repairs shall comply with the applicable provisions of the code for new construction or as permitted by this section. Work on undamaged components that is necessary for the required repair of damaged components shall be considered part of the repair and shall not be subject to requirements for alterations.

R4503.2 Materials. Materials used during repairs shall comply with this section.

R4503.2.1 New and replacement materials. Except as otherwise required or permitted by this code, materials permitted by this code for new construction, shall be used. Like materials shall be permitted for repairs, provided that unsafe conditions are not created. Hazardous materials shall not be used where this code does not permit their use in buildings of similar occupancy, purpose, and location.

R4503.2.2 Existing materials. Materials already in use in a building in compliance with requirements or approvals in effect at the time of their erection or installation shall be permitted to remain in use unless determined by the building official to be unsafe.

R4503.2.3 Plumbing materials and supplies. The following plumbing materials and supplies shall not be used:

1. All-purpose solvent cement, unless listed for the specific application.

2. Flexible traps and tailpieces, unless listed for the specific application.

3. Solder having more than 0.2-percent lead in the repair of potable water systems.

R4503.3 Water closets. Where any water closet is replaced with a newly manufactured water closet, the replacement water closet shall comply with the requirements of Uniform Plumbing Code Section 411.

R4503.4 Structural. Repaired structural elements and systems shall comply with Section R102.7.1 and the structural provisions of this chapter.

R4503.5 Demolition and replacement. Where a building or structure is effectively demolished by damage or where the intended method of repair is demolition and replacement, the replaced building, including its replaced foundation, shall comply with requirements for new construction in the International Residential Code.

| EXCEPTION: | Existing foundations are permitted to remain and be reused where approved by the code official. | | --- | --- |

History

• Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 23-02-058, 23-12-104, and 23-20-024, § 51-51-4503, filed 1/3/23, 6/7/23, and 9/25/23, effective 3/15/24.

Wash. Admin. Code § 51-51-4504 Section R4504—Alterations.

R4504.1 General.Alterations to existing buildings shall comply with the provisions of this code for new construction, except as permitted by this section.

R4504.2 Newly constructed elements. Newly constructed elements, components, and systems shall comply with the requirements of this code.

| EXCEPTION: | Added openable windows are not required to comply with the light and ventilation requirements of Section R303. | | --- | --- |

R4504.3 Nonconformities. The work shall not increase the extent of noncompliance or create nonconformity to those requirements that did not previously exist.

R4504.4 Structural. Altered structural elements and systems shall comply with Section R102.7.1 and the structural provisions of this chapter. New elements shall meet all of the requirements of this code for new construction. Structural elements that are uncovered during the course of the alteration and that are found to be unsafe shall be repaired in accordance with Section R102.7.1.

R4504.4.1 Decreased structural capacity. Where an alteration causes a decrease in capacity in any structural component, that structural component shall be shown to comply or shall be altered to comply with the applicable provisions of Chapters 3, 4, 5, 6, and 8.

R4504.4.2 Increased structural loads. Where an alteration causes an increase in loads as described in this section, the existing structural components that support the increased load, including the foundation, shall be shown to comply or shall be altered to comply with the applicable provisions of Chapters 3, 4, 5, 6, and 8. Existing structural components that do not provide support for the increased loads shall not be required to comply with this section.

R4504.4.2.1 Dead load increase. Dead load shall be considered to be increased for purposes of this section when the weight of materials used for the alteration exceeds the weight of the materials replaced, or when new materials or elements are added.

| EXCEPTIONS: | 1. Buildings in which the increase in dead load is due entirely to the addition of a second layer of roof covering weighing 3 pounds per square foot (0.1437 kN/m2) or less over an existing single layer of roof covering. | | --- | --- | | | 2. Installation of rooftop-mounted photovoltaic (PV) panel systems weighing 4 pounds per square foot or less over an existing single layer of roof covering. |

R4504.4.2.2 Live load increase. An increase in live load shall be determined based on Table R301.5.

R4504.4.2.3 Snow load increase. Snow load shall be considered to be increased for purposes of this section when alteration of the roof configuration creates new areas that accumulate drifted snow.

R4504.4.2.4 Wind load increase. Wind load shall be considered to be increased for purposes of this section when the surface area of any exterior elevation subject to wind pressure is increased by more than 5 percent.

R4504.4.2.5 Seismic load increase. Seismic load shall be considered to be increased for purposes of this section in existing buildings assigned to Seismic Design Category C, D0, D1, or D2 where new materials replace lighter weight materials in one of the following conditions:

1. Concrete tile or tile roof covering of similar weight is installed on more than 50 percent of the total roof area.

2. Brick veneer or cladding of similar weight is installed on walls above the second story.

R4504.5 Ventilation. Reconfigured spaces intended for occupancy and spaces converted to habitable or occupiable space in any work area shall be provided with ventilation in accordance with Section R303.

R4504.6 Ceiling height. Where a habitable attic or habitable space in a basement is created in an existing building, ceiling height shall not be less than 6 foot 8 inches (2032 mm). Bathrooms, toilet rooms, and laundry rooms shall have a ceiling height of not less than 6 feet 4 inches (1931 mm).

| EXCEPTIONS: | 1. For rooms with sloped ceilings, the required floor area of the room shall have a ceiling height of not less than 5 feet (1524 mm) and not less than 50 percent of the required floor area shall have a ceiling height of not less than 6 feet 8 inches (2134 mm). | | --- | --- | | | 2. At beams, girders, ducts, or other obstructions, the ceiling height shall be not less than 6 feet 4 inches (1931 mm) from the finished floor. |

R4504.7 Stairways, handrails, and guards. Stairs, handrails, and guards shall comply with this section.

R4504.7.1 Stairway illumination. Stairways within the work area shall be provided with illumination in accordance with Section R303.6.

R4504.7.2 Stair width. Existing stairs not otherwise being altered or modified shall be permitted to maintain their current clear width at, above and below existing handrails.

R4504.7.3 Stair headroom. Headroom height on existing stairs being altered or modified shall not be reduced below the existing stairway finished headroom. Existing stairs not otherwise being altered shall be permitted to maintain the current finished headroom.

R4504.7.4 Stair landing. Landings serving existing stairs being altered or modified shall not be reduced below the existing stairway landing depth and width. Existing stairs not otherwise being altered shall be permitted to maintain the current landing depth and width.

R4504.7.5 Stair treads and risers. An existing stairway shall not be required to comply with Section R311.7.5 where the existing space and construction does not allow a reduction in pitch or slope. Where risers are added to an existing stair, the tread and riser dimensions of the added risers shall match the existing stair.

R4504.7.6 Handrails and guards. Where a stair or any portion of a stair is reconstructed, a handrail and guard, where required, shall be provided in accordance with Section R311 and R312.

History

• Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 23-02-058, 23-12-104, and 23-20-024, § 51-51-4504, filed 1/3/23, 6/7/23, and 9/25/23, effective 3/15/24.

Wash. Admin. Code § 51-51-4505 Section R4505—Additions.

R4505.1 Additions to an existing building. Additions shall comply with this section and other applicable provisions of this code for new construction.

R4505.2 Structure for horizontal additions. Where an addition involves new construction next to and attached to an existing building and includes alterations to the existing building, the addition shall meet all of the requirements of this code for new construction. Alterations to the existing building shall comply with the requirements governing alterations within this code. In wood light-frame additions, connection of the structural components shall be permitted to be provided using wall top plates and addition studs that abut the existing building. Wall top plates shall be lapped and spliced in accordance with Section R602.3.2. Abutting studs shall be fastened in accordance with Table R602.3(1).

| EXCEPTION: | The structural components of the addition shall be permitted to be connected to the existing building in accordance with accepted engineering practice. | | --- | --- |

R4505.3 Structure for vertical additions. Where an addition involves new construction that adds a story to any part of the existing building or vertically increases the height of any part of the existing building, the new construction and the existing building together shall meet all of the requirements of this code for new construction.

| Exception: | Where the new structure and the existing structure together are evaluated in accordance with accepted engineering practice and are shown to be sufficient to support the combined loads from the new structure and existing structure, no structural alterations are required. | | --- | --- |

History

• Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 23-02-058, 23-12-104, and 23-20-024, § 51-51-4505, filed 1/3/23, 6/7/23, and 9/25/23, effective 3/15/24.

Wash. Admin. Code § 51-51-4506 Section R4506—Relocations.

R4506.1 Relocated buildings. Residential buildings or structures moved into or within the jurisdiction are not required to comply with the requirements of this code if the original use classification of the building or structure is not changed. Any repair, alteration, or change of use undertaken within the relocated structure shall comply with the requirements of this code applicable to the work being performed.

History

• Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 23-02-058, 23-12-104, and 23-20-024, § 51-51-4506, filed 1/3/23, 6/7/23, and 9/25/23, effective 3/15/24.

Wash. Admin. Code § 51-51-60101 Appendix F radon control methods.

AF101.1 General. This appendix contains requirements for new construction in jurisdictions where radon-resistant construction is required.

Inclusion of this appendix by jurisdictions shall be required in high radon potential counties as determined in Figure AF101 and as listed in Table AF101(1).

Unvented crawl spaces are not permitted in any high radon potential county. In other areas, requirements of this appendix apply to any structure constructed with unvented crawl spaces as specified in R408.3.

| | | --- |

TABLE AF101(1) HIGH RADON POTENTIAL (ZONE 1) COUNTIESA

washington: Clark, Ferry, Okanogan, Pend Oreille, Skamania, Spokane, Stevens.

a. EPA recommends that this county listing be supplemented with other available state and local data to further understand the radon potential of Zone 1 areas.

Reviser's note: The brackets and enclosed material in the text of the above section occurred in the copy filed by the agency.

Wash. Admin. Code § 51-51-60103 Section AF103—Requirements.

AF103.1 General. The following construction techniques are intended to resist radon entry and prepare the building for post-construction radon mitigation, if necessary (see Figure AF103.1). These techniques are required in high radon potential counties designated in Table AF101(1).

History

• Statutory Authority: RCW 19.27.031 and 19.27.074 WSR 23-23-104, § 51-51-60103, filed 11/15/23, effective 3/16/24
• WSR 20-03-023, § 51-51-60103, filed 1/6/20, effective 7/1/20. Statutory Authority: RCW 19.27.074, 19.27.020, and chapters 19.27 and 34.05 RCW. WSR 07-01-090, § 51-51-60103, filed 12/19/06, effective 7/1/07.

Wash. Admin. Code § 51-51-60104 Appendix AQ—Tiny houses.

AQ102 Definitions.

EGRESS ROOF ACCESS WINDOW. See Chapter 2.

LANDING PLATFORM. See Chapter 2.

LOFT. See Chapter 2.

TINY HOUSE. A dwelling unit that is 400 square feet (37 m2) or less in floor area excluding sleeping lofts.

AQ103.1 Minimum ceiling height. Habitable space in tiny houses shall have a ceiling height of not less than 6 feet 8 inches (2032 mm). Bathrooms, toilet rooms and kitchens shall have a ceiling height of not less than 6 feet 4 inches (1930 mm). Obstructions including, but not limited to, beams, girders, ducts and lighting, shall not extend below these minimum ceiling heights.

| EXCEPTION: | Ceiling heights in lofts shall be in accordance with Section R333. | | --- | --- |

AQ104 Energy conservation.

AQ104.1 Air leakage testing. The air leakage rate for tiny houses shall not exceed 0.30 cfm at 50 Pascals of pressure per square foot of the dwelling unit enclosure area. Testing shall be conducted in accordance with RESNET/ICC 380, ASTM E 779 or ASTM E 1827 and reported at a pressure of 0.2 inch w.g. (50 Pascals). Where required by the code official, testing shall be conducted by an approved third party. A written report of the results of the test shall be signed by the party conducting the test and provided to the code official. Testing shall be performed after the continuous air barrier, including all penetrations, is completed and sealed.

During testing:

1. Exterior windows and doors, fireplace and stove doors shall be closed, but not sealed, beyond the intended weather stripping or other infiltration control measures.

2. Dampers including exhaust, intake, makeup air, backdraft and flue dampers shall be closed, but not sealed beyond intended infiltration control measures.

3. Interior doors, if installed at the time of the test, shall be open.

4. Exterior louvers for continuous ventilation systems and heat recovery ventilators shall be closed and sealed.

5. Heating and cooling systems, if installed at the time of the test, shall be turned off.

6. Supply and return registers, if installed at the time of the test, shall be fully open.

AQ104.1.1 Whole-house mechanical ventilation. Where an air leakage rate not exceeding 0.30 cfm per ft of the dwelling unit enclosure area in accordance with Section AQ106.1 is provided, the tiny house shall be provided with whole-house mechanical ventilation in accordance with Section M1505.4.

AQ105 Emergency escape and rescue openings. This section is not adopted.

AQ106 Energy conservation. This section is not adopted.

History

• Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 23-23-104, § 51-51-60104, filed 11/15/23, effective 3/16/24
• WSR 20-21-041, § 51-51-60104, filed 10/13/20, effective 11/13/20
• WSR 20-03-023, § 51-51-60104, filed 1/6/20, effective 7/1/20.

Wash. Admin. Code § 51-51-60105 Appendix U—Dwelling unit fire sprinkler systems.

The design and installation of residential fire sprinkler systems shall be in accordance with the International Residential Code Section P2904 Dwelling Unit Fire Sprinkler Systems.

P2904.1.1 Required sprinkler locations. Sprinklers shall be installed to protect all areas of a dwelling unit.

| EXCEPTIONS: | 1. Uninhabitable attics, crawl spaces and normally unoccupied concealed spaces that do not contain fuel-fired appliances do not require sprinklers. In uninhabitable attics, crawl spaces and normally unoccupied concealed spaces that contain fuel-fired equipment, a sprinkler shall be installed above the equipment; however, sprinklers shall not be required in the remainder of the space. | | --- | --- | | | 2. Clothes closets, linen closets and pantries not exceeding 24 square feet (2.2 m2) in area, with the smallest dimension not greater than 3 feet (915 mm) and having wall and ceiling surfaces of gypsum board. | | | 3. Bathrooms not more than 55 square feet (5.1 m2) in area. | | | 4. Garages; carports; exterior porches; unheated entry areas, such as mud rooms, that are adjacent to an exterior door; and similar areas. |

Reviser's note: The permanent filing 23-23-104 contained no amendments to this section.

Wash. Admin. Code § 51-51-60106 Appendix T—Solar-ready provisions-detached one- and two-family dwellings and townhouses.

The provisions contained in this appendix are not mandatory unless specifically referenced in the adopting ordinance.

AT101 Scope.

AT102 General definitions.

AT102.1 General. The following term shall, for the purpose of this appendix, have the meaning shown herein.

Solar-ready zone. A section or sections of the roof or building overhang designated and reserved for the future installation of a solar photovoltaic or solar water-heating system.

AT103 Solar ready zone.

AT103.3 Solar-ready zone area. The total solar-ready zone area shall be not less than 300 square feet (27.87 m2) exclusive of mandatory access or set back areas as required by this code. New townhouses three stories or less in height above grade plane and with a total floor area less than or equal to 2,000 square feet (185.8 m2) per dwelling shall have a solar-ready zone area of not less than 150 square feet (13.94 m2). The solar-ready zone shall be composed of areas not less than 5 feet (1.52 m) in width and not less than 80 square feet (7.44 m2) exclusive of access or set back areas as required in this code or the applicable provisions of the International Fire Code. No portion of the solar zone shall be located on a roof slope greater than 2:12 that faces within 45 degrees of true north.

AT103.6 Capped roof penetration sleeve. A capped roof penetration sleeve shall be provided adjacent to a solar-ready zone when the solar-ready zone has a roof slope of 2:12 or less. The capped roof penetration sleeve shall be sized to accommodate the future photovoltaic system conduit, but shall have an inside diameter not less than 1 1/4 inches.

History

• Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 23-23-104, § 51-51-60106, filed 11/15/23, effective 3/16/24
• WSR 23-02-058, 23-12-104, and 23-20-024, § 51-51-60106, filed 1/3/23, 6/7/23, and 9/25/23, effective 3/15/24
• WSR 20-21-041, § 51-51-60106, filed 10/13/20, effective 11/13/20
• WSR 16-03-025, § 51-51-60106, filed 1/11/16, effective 7/1/16.

Wash. Admin. Code § 51-51-60107 Appendix AWV—Fire sprinklers.

The provisions contained in this appendix are not mandatory unless specifically referenced in the adopting ordinance.

AWV107.1 Fire sprinklers. An approved automatic fire sprinkler system shall be installed in new one-family and two-family dwellings and townhouses in accordance with Appendix AWU.

History

• Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 23-23-104, § 51-51-60107, filed 11/15/23, effective 3/16/24
• WSR 20-03-023, § 51-51-60107, filed 1/6/20, effective 7/1/20
• WSR 16-03-025, § 51-51-60107, filed 1/11/16, effective 7/1/16
• WSR 10-03-098, § 51-51-60107, filed 1/20/10, effective 7/1/10.

Wash. Admin. Code § 51-51-60108 Appendix Y—Construction and demolition material management.

The provisions contained in this appendix are not mandatory unless specifically referenced in the adopting ordinance.

AWY101 General.

AWY101.1 Purpose. The purpose of this code section is to increase the reuse and recycling of construction and demolition materials.

AWY101.2 Scope. This code section applies to new buildings and structures construction, alterations to existing buildings and structures and the demolition of existing buildings and structures having a work area greater than 750 square feet (69.68 m2) or with a project value greater than $75,000, whichever is more restrictive.

| EXCEPTION: | Projects determined to be unsafe. | | --- | --- |

AWY102 General definitions.

AWY102.1 General. The following words and terms shall, for the purposes of this appendix, have the meanings shown herein. Refer to Chapter 2 of this code for general definitions.

Demolition. The process of razing, relocating, or removing an existing building or structure, or a portion thereof.

Divert, diverted, or diversion. The reuse, recycling, or beneficial use of construction and demolition materials.

Recycling. The process of transforming or remanufacturing waste materials into useable or marketable materials for use other than landfill disposal or incineration.

Reuse. The return of a material into the economic stream for use.

Salvage. The recovery of construction and demolition building material and components from a building or site in order to increase the reuse or repurpose potential of these materials and decrease the amount of material being sent to the landfill. Salvaged material may be sold, donated, or reused on site.

AWY103 Construction and demolition material management.

AWY103.1 Collection containers. All sites where recyclable construction and demolition materials are generated and transported for recycling must provide a separate container for nonrecyclable materials pursuant to WAC 173-345-040.

AWY103.2 Salvage assessment. A salvage assessment shall be submitted prior to permit issuance. The salvage assessment shall identify the building components of an existing building that, if removed, have the potential to be reused. This assessment shall be signed by the owner and serve as an affidavit stating that the project shall be executed in compliance with the requirements of this code.

| EXCEPTION: | Projects that include only new construction. | | --- | --- |

AWY103.3 Waste diversion report. A waste diversion report shall be submitted prior to issuance of the Certificate of Occupancy or approval of final inspection. The waste diversion report shall identify the following:

1. Weight or volume of project-generated construction and demolition material;

2. Whether the material was disposed in a landfill or diverted;

3. The hauler of the material;

4. The receiving facility or location; and

5. The date materials were accepted by the receiving facility or location.

History

• Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 23-23-104, § 51-51-60108, filed 11/15/23, effective 3/16/24
• WSR 23-02-058, 23-12-104, and 23-20-024, § 51-51-60108, filed 1/3/23, 6/7/23, and 9/25/23, effective 3/15/24.

Wash. Admin. Code § 51-51-60109 Appendix Z—Building deconstruction.

The provisions contained in this appendix are not mandatory unless specifically referenced in the adopting ordinance.

AWZ101 General.

AWZ101.1 Purpose. The purpose of this section is to increase the amount of material salvaged for reuse through the act of deconstruction when a building or structure is demolished. Used sawn lumber is permitted to be reused in accordance with Section R602.1.1.1.

AWZ101.2 Scope. This section applies to existing dwellings, townhouses, and accessory structures permitted to be demolished that are greater than 750 square feet (69.68 m2) and meet one of the following:

1. The structure has been identified as a historic building; or

2. The structure was built 90, or more, years ago.

| EXCEPTIONS: | 1. The structure is determined to be unsafe by the engineer of record; | | --- | --- | | | 2. The structure shall be relocated; | | | 3. The engineer of record determines that 50 percent, by weight, of the material in the structure that is not concrete, is not suitable for reuse. |

AWZ102 General definitions.

AWZ102.1 General. The following words and terms shall, for the purposes of this appendix, have the meanings shown herein. Refer to Chapter 2 of this code for general definitions.

Deconstruction. The systematic disassembly of a structure, in order to salvage building materials or components for the primary purpose of reusing materials to the maximum extent possible, with a secondary purpose of recycling the remaining materials.

Demolition. The process of razing, relocating, or removing an existing building or structure, or a portion thereof.

Heavy machinery. Heavy machinery includes, but is not limited to, track hoes, excavators, skid steer loaders, or forklifts.

Recycling. The process of transforming or remanufacturing waste materials into useable or marketable materials for use other than landfill disposal or incineration.

Reuse. The return of a material into the economic stream for use.

Salvage. The recovery of construction and demolition building material and components from a building or site in order to increase the reuse or repurpose potential of these materials and decrease the amount of material being sent to the landfill. Salvaged material may be sold, donated, or reused.

AWZ103 Deconstruction.

AWZ103.1 Deconstruction. Buildings and structures meeting the requirements of Section AZ101.2 shall be deconstructed.

AWZ103.2 Heavy machinery. Heavy machinery may not be used in deconstruction to remove or dismantle components of buildings and structures in ways that render the components unsuitable for salvage.

History

• Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 23-23-104, § 51-51-60109, filed 11/15/23, effective 3/16/24
• WSR 23-02-058, 23-12-104, and 23-20-024, § 51-51-60109, filed 1/3/23, 6/7/23, and 9/25/23, effective 3/15/24.

Chapter 51-52 State Building Code adoption and amendment of the 2021 edition of the International Mechanical Code.

Wash. Admin. Code § 51-52-001 Authority.

These rules are adopted under the authority of chapter 19.27 RCW.

History

• Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 04-01-104, § 51-52-001, filed 12/17/03, effective 7/1/04.

Wash. Admin. Code § 51-52-002 Purpose.

The purpose of these rules is to implement the provisions of chapter 19.27 RCW, which provides that the state building code council shall maintain the State Building Code in a status which is consistent with the purpose as set forth in RCW 19.27.020. In maintaining the codes the council shall regularly review updated versions of the codes adopted under the act, and other pertinent information, and shall amend the codes as deemed appropriate by the council.

History

• Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 04-01-104, § 51-52-002, filed 12/17/03, effective 7/1/04.

Wash. Admin. Code § 51-52-003 International Mechanical Code.

The 2021 edition of the International Mechanical Code published by the International Code Council is hereby adopted by reference with the exceptions noted in this chapter of the Washington Administrative Code (WAC).

History

• Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 23-23-105, § 51-52-003, filed 11/15/23, effective 3/16/24
• WSR 23-02-055, 23-12-106, and 23-20-025, § 51-52-003, filed 1/3/23, 6/7/23, and 9/25/23, effective 3/15/24
• WSR 20-03-041, § 51-52-003, filed 1/8/20, effective 7/1/20
• WSR 16-01-148, § 51-52-003, filed 12/21/15, effective 7/1/16. Statutory Authority: RCW 19.27.031, 19.27.074 and chapters 19.27 and 34.05 RCW. WSR 13-04-053, § 51-52-003, filed 2/1/13, effective 7/1/13. Statutory Authority: RCW 19.27.190, 19.27.074, 19.27.031 and chapters 19.27 and 34.05 RCW. WSR 10-03-099, § 51-52-003, filed 1/20/10, effective 7/1/10. Statutory Authority: RCW 19.27.190, 19.27.020, and chapters 19.27 and 34.05 RCW. WSR 07-01-092, § 51-52-003, filed 12/19/06, effective 7/1/07. Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 04-01-104, § 51-52-003, filed 12/17/03, effective 7/1/04.

Wash. Admin. Code § 51-52-004 Conflict between International Mechanical Code and State Energy Code chapter 51-11C WAC.

In the case of conflict between the duct sealing or insulation requirements of Section 603 or Section 604 of this code and the duct sealing or insulation requirements of chapter 51-11C WAC, the Washington State Energy Code, or where applicable, a local jurisdiction's energy code, the provisions of such energy codes shall govern.

History

• Statutory Authority: RCW 19.27.031, 19.27.074 and chapters 19.27 and 34.05 RCW. WSR 13-04-053, § 51-52-004, filed 2/1/13, effective 7/1/13. Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 04-01-104, § 51-52-004, filed 12/17/03, effective 7/1/04.

Wash. Admin. Code § 51-52-005 Reserved.

History

• Statutory Authority: RCW 19.27.190, 19.27.074, 19.27.031 and chapters 19.27 and 34.05 RCW. WSR 10-03-099, § 51-52-005, filed 1/20/10, effective 7/1/10. Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 04-01-104, § 51-52-005, filed 12/17/03, effective 7/1/04.

Wash. Admin. Code § 51-52-007 Exceptions.

The exceptions and amendments to the International Mechanical Code contained in the provisions of chapter 19.27 RCW shall apply in case of conflict with any of the provisions of these rules.

The provisions of this code do not apply to temporary growing structures used solely for the commercial production of horticultural plants including ornamental plants, flowers, vegetables, and fruits. "Temporary growing structure" means a structure that has the sides and roof covered with polyethylene, polyvinyl, or similar flexible synthetic material and is used to provide plants with either frost protection or increased heat retention. A temporary growing structure is not considered a building for purposes of this code.

Codes referenced which are not adopted through RCW 19.27.031 or chapter 19.27A RCW shall not apply unless specifically adopted by the authority having jurisdiction.

History

• Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 04-01-104, § 51-52-007, filed 12/17/03, effective 7/1/04.

Wash. Admin. Code § 51-52-008 Implementation.

The International Mechanical Code adopted by chapter 51-52 WAC shall become effective in all counties and cities of this state on March 15, 2024.

History

• Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 23-23-105, § 51-52-008, filed 11/15/23, effective 3/16/24
• WSR 23-02-055, 23-12-106, and 23-20-025, § 51-52-008, filed 1/3/23, 6/7/23, and 9/25/23, effective 3/15/24
• WSR 21-11-066, § 51-52-008, filed 5/14/21, effective 6/14/21
• WSR 20-03-041, § 51-52-008, filed 1/8/20, effective 7/1/20
• WSR 16-01-148, § 51-52-008, filed 12/21/15, effective 7/1/16. Statutory Authority: RCW 19.27.031, 19.27.074 and chapters 19.27 and 34.05 RCW. WSR 13-04-053, § 51-52-008, filed 2/1/13, effective 7/1/13. Statutory Authority: RCW 19.27.190, 19.27.074, 19.27.031 and chapters 19.27 and 34.05 RCW. WSR 10-03-099, § 51-52-008, filed 1/20/10, effective 7/1/10. Statutory Authority: RCW 19.27.190, 19.27.020, and chapters 19.27 and 34.05 RCW. WSR 07-01-092, § 51-52-008, filed 12/19/06, effective 7/1/07. Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 04-01-104, § 51-52-008, filed 12/17/03, effective 7/1/04.

Wash. Admin. Code § 51-52-0101 Section 101—General.

101.2 Scope. This code shall regulate the design, installation, maintenance, alteration and inspection of mechanical systems that are permanently installed and utilized to provide control of environmental conditions and related processes within buildings. This code shall also regulate those mechanical systems, system components, equipment and appliances specifically addressed herein. The installation of fuel gas distribution piping and equipment, fuel gas-fired appliances and fuel gas-fired appliance venting systems shall be regulated by the International Fuel Gas Code. References in this code to Group R shall include Group I-1, Condition 2 assisted living facilities licensed by Washington state under chapter 388-78A WAC and Group I-1, Condition 2 residential treatment facilities licensed by Washington state under chapter 246-337 WAC.

| EXCEPTIONS: | 1. Detached one- and two-family dwellings and multiple single-family dwellings (townhouses) not more than three stories high with separate means of egress and their accessory structures shall comply with the International Residential Code. | | --- | --- | | | 2. The standards for liquefied petroleum gas installations shall be the 2020 Edition of NFPA 58 (Liquefied Petroleum Gas Code) and the 2021 Edition of ANSI Z223.1/NFPA 54 (National Fuel Gas Code). |

History

• Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 23-02-055, 23-12-106, and 23-20-025, § 51-52-0101, filed 1/3/23, 6/7/23, and 9/25/23, effective 3/15/24
• WSR 20-03-041, § 51-52-0101, filed 1/8/20, effective 7/1/20. Statutory Authority: RCW 19.27.031, 19.27.074, and chapters 19.27 and 34.05 RCW. WSR 17-17-159, § 51-52-0101, filed 8/23/17, effective 10/1/17. Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 16-01-148, § 51-52-0101, filed 12/21/15, effective 7/1/16. Statutory Authority: RCW 19.27.031, 19.27.074 and chapters 19.27 and 34.05 RCW. WSR 13-04-053, § 51-52-0101, filed 2/1/13, effective 7/1/13. Statutory Authority: RCW 19.27.190, 19.27.074, 19.27.031 and chapters 19.27 and 34.05 RCW. WSR 10-03-099, § 51-52-0101, filed 1/20/10, effective 7/1/10. Statutory Authority: RCW 19.27.190, 19.27.020, and chapters 19.27 and 34.05 RCW. WSR 07-01-092, § 51-52-0101, filed 12/19/06, effective 7/1/07. Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 04-01-104, § 51-52-0101, filed 12/17/03, effective 7/1/04.

Wash. Admin. Code § 51-52-0102 Section 102—Applicability.

Reserved.

History

• Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 17-10-075, § 51-52-0102, filed 5/3/17, effective 6/3/17
• WSR 16-01-148, § 51-52-0102, filed 12/21/15, effective 7/1/16. Statutory Authority: RCW 19.27.031, 19.27.074 and chapters 19.27 and 34.05 RCW. WSR 13-04-053, § 51-52-0102, filed 2/1/13, effective 7/1/13.

Wash. Admin. Code § 51-52-0113 Section 113—Stop work order.

113.4 Failure to comply. Any person who shall continue any work after having been served with a stop work order, except such work as that person is directed to perform to remove a violation or unsafe condition, shall be subject to fines established by the code official.

History

• Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 23-02-055, 23-12-106, and 23-20-025, § 51-52-0113, filed 1/3/23, 6/7/23, and 9/25/23, effective 3/15/24.

Wash. Admin. Code § 51-52-0202 Section 202—General definitions.

BALANCED WHOLE HOUSE VENTILATION. Any combination of concurrently operating residential dwelling or sleeping unit mechanical exhaust and mechanical supply whereby the total mechanical exhaust airflow rate is within 10 percent or 5 cfm, whichever is greater, of the total mechanical supply airflow rate.

NOT BALANCED WHOLE HOUSE VENTILATION. A whole house ventilation system serving a dwelling or sleeping unit that is not considered balanced in accordance with the definition in this code for balanced whole house ventilation system. Only other than Group R-2 dwelling and sleeping units are allowed in accordance with Section 403.4.4.1 to have not balanced whole house ventilation systems.

DISTRIBUTED WHOLE HOUSE VENTILATION. A whole house ventilation system shall be considered distributed when it supplies outdoor air directly (not transfer air) to each dwelling or sleeping unit habitable space, (living room, den, office, interior adjacent room, interior adjoining spaces or bedroom), and exhausts air from all kitchens and bathrooms directly outside.

NOT DISTRIBUTED WHOLE HOUSE VENTILATION. A whole house ventilation system shall be considered not distributed when either the supply system or the exhaust system is not distributed. Supply systems are not distributed when a habitable space is supplied with outdoor air to ventilate an interior adjacent room or an interior adjoining space. Exhaust systems are not distributed when all bathrooms and kitchens are not exhausted by the whole house ventilation system. If either the supply system or the exhaust system is not distributed, then the ventilation quality adjustment system coefficient adjustment is required in accordance with Section C403.4.3.

ENCLOSED KITCHEN. A kitchen whose permanent openings to interior adjacent spaces do not exceed a total of 60 square feet (6 m2).

INTERIOR ADJACENT ROOM. An enclosed room without exterior windows or openings to the outdoors located within a dwelling or sleeping unit that does not have interior unobstructed openings required for an interior adjoining space.

INTERIOR ADJOINING SPACE. A room or space without openings to the outdoors that is naturally ventilated from another habitable space by unobstructed fixed openings size in accordance with Section 402.3.

LOCAL EXHAUST. An exhaust system that uses one or more fans to exhaust air from a specific room or rooms within a residential dwelling or sleeping unit.

PERMANENT CONSTRUCTION. Construction that, if removed, would disturb the structural integrity of the building or the fire-resistance rating of a building assembly.

RELIEF AIR. Exhausted return air from a system that provides ventilation for human usage.

REPLACEMENT AIR. Outdoor air that is used to replace air removed from a building through an exhaust system. Replacement air may be derived from one or more of the following: Makeup air, supply air, transfer air, and infiltration. However, the ultimate source of all replacement air is outdoor air. When replacement air exceeds exhaust, the result is exfiltration.

WHOLE HOUSE VENTILATION SYSTEM. A mechanical ventilation system, including fans, controls, and ducts, which replaces, by direct means, air from the habitable rooms with outdoor air.

VENTILATION ZONE. Any indoor area that requires ventilation and comprises one or more spaces with the same occupancy category (see Table 403.3.1.1), occupant density, zone air distribution effectiveness (see Section 403.3.1.1.1.2), and design zone primary airflow per unit area.

History

• Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 23-02-055, 23-12-106, and 23-20-025, § 51-52-0202, filed 1/3/23, 6/7/23, and 9/25/23, effective 3/15/24
• WSR 20-03-041, § 51-52-0202, filed 1/8/20, effective 7/1/20
• WSR 16-01-148, § 51-52-0202, filed 12/21/15, effective 7/1/16. Statutory Authority: RCW 19.27.031, 19.27.074 and chapters 19.27 and 34.05 RCW. WSR 13-04-053, § 51-52-0202, filed 2/1/13, effective 7/1/13. Statutory Authority: RCW 19.27.190, 19.27.074, 19.27.031 and chapters 19.27 and 34.05 RCW. WSR 10-03-099, § 51-52-0202, filed 1/20/10, effective 7/1/10. Statutory Authority: RCW 19.27.190, 19.27.020, and chapters 19.27 and 34.05 RCW. WSR 07-01-092, § 51-52-0202, filed 12/19/06, effective 7/1/07. Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 04-01-104, § 51-52-0202, filed 12/17/03, effective 7/1/04.

Wash. Admin. Code § 51-52-0301 Section 301—Reserved.

History

• Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 20-03-041, § 51-52-0301, filed 1/8/20, effective 7/1/20
• WSR 16-01-148, § 51-52-0301, filed 12/21/15, effective 7/1/16. Statutory Authority: RCW 19.27.031, 19.27.074 and chapters 19.27 and 34.05 RCW. WSR 13-04-053, § 51-52-0301, filed 2/1/13, effective 7/1/13.

Wash. Admin. Code § 51-52-0306 Section 306—Access and service space.

306.5 Equipment and appliances on roofs or elevated structures. Where equipment requiring access or appliances are located on an elevated structure or the roof of a building such that personnel will have to climb higher than 16 feet (4877 mm) above grade to access such equipment or appliances, an interior or exterior means of access shall be provided. Such access shall not require climbing over obstructions greater than 30 inches (762 mm) in height or walking on roofs having a slope greater than 4 units vertical in 12 units horizontal (33 percent slope). Such access shall not require the use of portable ladders. Where access involves climbing over parapet walls, the height shall be measured to the top of the parapet wall.

Permanent ladders installed to provide the required access shall comply with the following minimum design criteria:

1. The side railing shall extend above the parapet or roof edge not less than 42 inches (1067 mm).

2. Ladders shall have rung spacing not to exceed 12 inches (305 mm) on center. The uppermost rung shall be a maximum of 24 inches below the upper edge of the roof hatch, roof or parapet, as applicable.

3. Ladders shall have a toe spacing not less than 7 inches (178 mm) deep.

4. There shall be a minimum of 18 inches (457 mm) between rails.

5. Rungs shall have a minimum 0.75-inch (19 mm) diameter and be capable of withstanding a 300-pound (136.1 kg) load.

6. Ladders over 30 feet (9144 mm) in height shall be provided with offset sections and landings capable of withstanding 100 pounds (488.2 kg/m2) per square foot. Landing dimensions shall be not less than 18 inches and not less than the width of the ladder served. A guardrail shall be provided on all open sides of the landing.

7. Climbing clearances. The distance from the centerline of the rungs to the nearest permanent object on the climbing side of the ladder shall be a minimum of 30 inches measured perpendicular to the rungs. This distance shall be maintained from the point of ladder access to the bottom of the roof hatch. A minimum clear width of 15 inches shall be provided on both sides of the ladder measured from the midpoint of and parallel with the rungs except where cages or wells are installed.

8. Landing required. The ladder shall be provided with a clear and unobstructed bottom landing area having a minimum dimension of 30 inches by 30 inches centered in front of the ladder.

9. Ladders shall be protected against corrosion by approved means.

10. Access to ladders shall be provided at all times.

Catwalks installed to provide the required access shall be not less than 24 inches (610 mm) wide and shall have railings as required for service platforms.

| EXCEPTION: | This section shall not apply to Group R-3 occupancies. | | --- | --- |

306.6 Appliances above ceilings. Appliances that are located above ceilings shall have access for inspection, service and repair without removing permanent construction. Appliances that are located above a ceiling shall be provided with access to the working space(s) by an opening not smaller than 22 inches by 22 inches (559 mm by 559 mm). All enclosure doors or hinged panels shall be capable of opening a minimum of 90 degrees.

The appliance is not required to be removable or replaceable through the enclosure door, hinged panel, removable lay-in ceiling tile, or other removable covers. The appliance may be removed or replaced by removing the ceiling or wall assemblies adjacent to the appliance as long as they are not permanent construction.

| EXCEPTIONS: | 1. This section shall not apply to replacement appliances installed in existing compartments and alcoves where the working space clearances are in accordance with the appliance manufacturer's installation instructions. | | --- | --- | | | 2. A smaller enclosure door, hinged panel, removable lay-in ceiling tile, or other removable covers shall be permitted when allowed by the appliance manufacturer's installation instructions and electrical access is not required. |

History

• Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 23-02-055, 23-12-106, and 23-20-025, § 51-52-0306, filed 1/3/23, 6/7/23, and 9/25/23, effective 3/15/24
• WSR 20-03-041, § 51-52-0306, filed 1/8/20, effective 7/1/20
• WSR 16-01-148, § 51-52-0306, filed 12/21/15, effective 7/1/16. Statutory Authority: RCW 19.27.031, 19.27.074 and chapters 19.27 and 34.05 RCW. WSR 13-04-053, § 51-52-0306, filed 2/1/13, effective 7/1/13. Statutory Authority: RCW 19.27.190, 19.27.074, 19.27.031 and chapters 19.27 and 34.05 RCW. WSR 10-03-099, § 51-52-0306, filed 1/20/10, effective 7/1/10.

Wash. Admin. Code § 51-52-0307 Section 307—Condensate disposal.

307.2.3 Auxiliary and secondary drain systems. In addition to the requirements of Section 307.2.1, where damage to any building components could occur as a result of overflow from the equipment primary condensate removal system, one of the following auxiliary protection methods shall be provided for each cooling coil or fuel-fired appliance that produces condensate:

1. An auxiliary drain pan with a separate drain shall be provided under the coils on which condensation will occur. The auxiliary pan drain shall discharge to a conspicuous point of disposal to alert occupants in the event of a stoppage of the primary drain. The pan shall have a minimum depth of 1 1/2 inches (38 mm), shall not be less than 3 inches (76 mm) larger than the unit or the coil dimensions in width and length and shall be constructed of corrosion-resistant material. Galvanized sheet steel pans shall have a minimum thickness of not less than 0.0236 inch (0.6010 mm) (No. 24 gage). Nonmetallic pans shall have a minimum thickness of not less than 0.0625 inch (1.6 mm).

2. A separate overflow drain line shall be connected to the drain pan provided with the equipment. Such overflow drain shall discharge to a conspicuous point of disposal to alert occupants in the event of a stoppage of the primary drain. The overflow drain line shall connect to the drain pan at a higher level than the primary drain connection.

3. An auxiliary drain pan without a separate drain line shall be provided under the coils on which condensate will occur. Such pan shall be equipped with a water-level detection device conforming to UL 508 that will shut off the equipment served prior to overflow of the pan. The auxiliary drain pan shall be constructed in accordance with Item 1 of this section.

4. A water-level detection device conforming to UL 508 shall be provided that will shut off the equipment served in the event that the primary drain is blocked. The device shall be installed in the primary drain line, the overflow drain line, or in the equipment-supplied drain pan, located at a point higher than the primary drain line connection and below the overflow rim of such pan.

| EXCEPTIONS: | 1. Fuel-fired appliances that automatically shut down operation in the event of a stoppage in the condensate drainage system. | | --- | --- | | | 2. Unducted fan coil units where there is no factory option available for water-level detection devices and which are installed directly within the occupied space. |

307.2.4.1 Ductless mini-split system traps. Ductless mini-split equipment that produces condensate shall be provided with an inline check valve located in the drain line, a trap, or other means of condensate drainage in accordance with the manufacturer's instructions.

History

• Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 16-01-148, § 51-52-0307, filed 12/21/15, effective 7/1/16. Statutory Authority: RCW 19.27.031, 19.27.074 and chapters 19.27 and 34.05 RCW. WSR 13-04-053, § 51-52-0307, filed 2/1/13, effective 7/1/13.

Wash. Admin. Code § 51-52-0401 Section 401—General.

401.2 Ventilation required. Every occupied space other than enclosed parking garages and buildings used for repair of automobiles shall be ventilated in accordance with Section 401.2.1, 401.2.2 or 401.2.3. Enclosed parking garages and buildings used for repair of automobiles shall be ventilated by mechanical means in accordance with Sections 403 and 404.

401.2.1 Group R occupancies. Ventilation in Group R occupancies shall be provided in accordance with Section 403.4.

401.2.2 Ambulatory care facilities and Group I-2 occupancies. Ambulatory care facilities and Group I-2 occupancies shall be ventilated by mechanical means in accordance with Section 407.

401.2.3 All other occupancies. Ventilation in all other occupancies shall be provided by natural means in accordance with Section 402 or by mechanical means in accordance with Sections 403.1 to 403.7.

401.3 When required. Group R occupancies shall be vented continuously or intermittently in accordance with Section 403.4. Ventilation in all other occupancies shall be provided during the periods that the room or space is occupied.

401.4 Intake opening location. Air intake openings shall comply with all of the following:

1. Intake openings shall be located not less than 10 feet (3048 mm) from lot lines or buildings on the same lot. Lot lines shall not be defined as a separation from a street or public way.

2. Mechanical and gravity outdoor air intake openings shall be located not less than 10 feet (3048 mm) horizontally from any hazardous or noxious contaminant source, such as vents, streets, alleys, parking lots, and loading docks, except as specified in Item 3 or Section 501.3.1. Outdoor air intake openings shall be permitted to be located less than 10 feet (3048 mm) horizontally from streets, alleys, parking garage entries, parking lots, and loading docks provided that the openings are located not less than 25 feet (7620 mm) vertically above such locations. Where openings front on a street or public way, the distance shall be measured from the closest edge of the street or public way.

| EXCEPTIONS: | 1. Intake air openings providing less than 500 cfm of outdoor air to Group R occupancies are permitted to be located less than 10 feet (3048 mm) horizontally from parking lots provided that the openings are not less than 15 feet (4572 mm) vertically above the parking lot. | | --- | --- | | | 2. Intake air openings providing less than 500 cfm of outdoor air to Group R occupancies are permitted to be located less than 10 feet (3048 mm) horizontally from parking lots provided that the openings are not less than 15 feet (4572 mm) vertically above the clear height for vehicles in the parking garage. |

3. Intake openings shall be located not less than 3 feet (914 mm) below contaminant sources where such sources are located within 10 feet (3048 mm) of the opening. Separation is not required between intake air openings, operable openings, and living space exhaust air openings of an individual dwelling unit or sleeping unit where an approved factory-built intake/exhaust combination termination fitting is used to separate the air streams in accordance with the manufacturer's instructions. For these combined terminations, the exhaust air concentration within the intake airflow shall not exceed 10 percent as established by the manufacturer, in accordance with ASHRAE 62.2 Section 6.8, Exception 4. A minimum of three feet (914 mm) separation shall be maintained between other environmental air exhaust outlets and other dwelling or sleeping unit factory-built intake/exhaust combination termination fittings.

4. Intake openings on structures in flood hazard areas shall be at or above the elevation required by Section 1612 of the International Building Code for utilities and attendant equipment.

| EXCEPTION: | Enclosed parking garage and repair garage ventilation air intakes are permitted to be located less than 10 feet horizontally from or 25 feet vertically above a street, alley, parking lot, and loading dock. | | --- | --- |

401.7 Testing and balancing. At the discretion of the building official, flow testing may be required to verify that the mechanical system(s) satisfies the requirements of this chapter. Flow testing may be performed using flow hood measuring at the intake or exhaust points of the system, in-line pitot tube, or pitot-traverse type measurement systems in the duct, short term tracer gas measurements, or other means approved by the code official.

History

• Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 23-23-105, § 51-52-0401, filed 11/15/23, effective 3/16/24
• WSR 23-02-055, 23-12-106, and 23-20-025, § 51-52-0401, filed 1/3/23, 6/7/23, and 9/25/23, effective 3/15/24
• WSR 20-03-041, § 51-52-0401, filed 1/8/20, effective 7/1/20
• WSR 16-01-148, § 51-52-0401, filed 12/21/15, effective 7/1/16. Statutory Authority: RCW 19.27.190, 19.27.074, 19.27.031 and chapters 19.27 and 34.05 RCW. WSR 10-03-099, § 51-52-0401, filed 1/20/10, effective 7/1/10. Statutory Authority: RCW 19.27.190, 19.27.020, and chapters 19.27 and 34.05 RCW. WSR 07-01-092, § 51-52-0401, filed 12/19/06, effective 7/1/07. Statutory Authority: RCW 19.27.020, 19.27.031, 19.27.074 and chapters 19.27 and 34.05 RCW. WSR 05-01-015, § 51-52-0401, filed 12/2/04, effective 7/1/05.

Wash. Admin. Code § 51-52-0403 Section 403—Mechanical ventilation.

403.1 Ventilation system. Mechanical ventilation shall be provided by a method of supply air and return or exhaust air. The amount of supply air shall be approximately equal to the amount of return and exhaust air. The system shall not be prohibited from producing negative or positive pressure. The system to convey ventilation air shall be designed and installed in accordance with Chapter 6.

403.2 Outdoor air required. The minimum outdoor airflow rate shall be determined in accordance with Section 403.3.

| EXCEPTIONS: | 1. Where the registered design professional demonstrates that an engineered ventilation system design will prevent the maximum concentration of contaminants from exceeding that obtainable by the rate of outdoor air ventilation determined in accordance with Section 403.3, the minimum required rate of outdoor air shall be reduced in accordance with such engineered system design. | | --- | --- | | | 2. Alternate systems designed in accordance with ASHRAE Standard 62.1 Section 6.2, Ventilation Rate Procedure, shall be permitted. |

403.2.1 Recirculation of air. The air required by Section 403.3 shall not be recirculated. Air in excess of that required by Section 403.3 shall not be prohibited from being recirculated as a component of supply air to building spaces, except that:

1. Ventilation air shall not be recirculated from one dwelling to another or to dissimilar occupancies.

2. Supply air to a swimming pool and associated deck areas shall not be recirculated unless such air is dehumidified to maintain the relative humidity of the area at 60 percent or less. Air from this area shall not be recirculated to other spaces where 10 percent or more of the resulting supply airstream consists of air recirculated from these spaces. The design and installation of dehumidification systems shall comply with ANSI/ACCA 10 Manual SPS.

3. Where mechanical exhaust is required by Note b in Table 403.3.1.1, recirculation of air from such spaces shall be prohibited. All air supplied to such spaces shall be exhausted, including any air in excess of that required by Table 403.3.1.1.

4. Where mechanical exhaust is required by Note g in Table 403.3.1.1, mechanical exhaust is required and recirculation from such spaces is prohibited where more than 10 percent of the resulting supply airstream consists of air recirculated from these spaces. Recirculation of air that is contained completely within such spaces shall not be prohibited.

403.3Outdoor air and local exhaust airflow rates. Group R occupancies shall be provided with outdoor air and local exhaust in accordance with Section 403.4. All other buildings intended to be occupied shall be provided with outdoor air and local exhaust in accordance with Section 403.3.1.

403.3.1.1 Outdoor airflow rate. Ventilation systems shall be designed to have the capacity to supply the minimum outdoor airflow rate determined in accordance with this section. In each occupiable space, the ventilation system shall be designed to deliver the required rate of outdoor airflow to the breathing zone. Outdoor air shall be supplied directly to each occupiable space from an air handling unit through a fully ducted path or ducted to within 12 inches of the return air opening of a fan-powered terminal unit used to transfer the outdoor air to the occupiable space. The occupant load utilized for design of the ventilation system shall not be less than the number determined from the estimated maximum occupant load rate indicated in Table 403.3.1.1. Ventilation rates for occupancies not represented in Table 403.3.1.1 shall be those for a listed occupancy classification that is most similar in terms of occupant density, activities and building construction; or shall be determined by an approved engineering analysis. The ventilation system, including transfer fan-powered terminal units, shall be designed to supply the required rate of ventilation air continuously during the period the building is occupied, except as otherwise stated in other provisions of the code.

With the exception of smoking lounges, the ventilation rates in Table 403.3.1.1 are based on the absence of smoking in occupiable spaces. Where smoking is anticipated in a space other than a smoking lounge, the ventilation system serving the space shall be designed to provide ventilation over and above that required by Table 403.3.1.1 in accordance with accepted engineering practice.

| EXCEPTION: | Where occupancy density is known and documented in the plans, the outside air rate may be based on the design occupant density. Under no circumstance shall the occupancies used result in outside air less than one-half that resulting from application of Table 403.3.1.1 estimated maximum occupancy rates. | | --- | --- |

Table 403.3.1.1

REQUIRED OUTDOOR VENTILATION AIR

| Occupancy Classification | Occupant Density #/1000 ft2a | People Outdoor Airflow Rate in Breathing Zone Rp cfm/Person | Area Outdoor Airflow Rate in Breathing Zone Ra cfm/ft2a | Exhaust Airflow Rate cfm/ft2a | | | --- | --- | --- | --- | --- | --- | | Correctional facilities | | | | | | | | Booking/waiting | 50 | 7.5 | 0.06 | — | | | Cells | | | | | | | Without plumbing fixtures | 25 | 5 | 0.12 | — | | | With plumbing fixturesg | 25 | 5 | 0.12 | 1.0 | | | Day room | 30 | 5 | 0.06 | — | | | Dining halls | — | — | — | — | | | (see "Food and beverage service") | — | — | — | — | | | Guard stations | 15 | 5 | 0.06 | — | | Dry cleaners, laundries | | | | | | | | Coin-operated dry cleaner | 20 | 15 | — | — | | | Coin-operated laundries | 20 | 7.5 | 0.12 | — | | | Commercial dry cleaner | 30 | 30 | — | — | | | Commercial laundry | 10 | 5 | 0.12 | — | | | Storage, pick up | 30 | 7.5 | 0.12 | — | | Education | | | | | | | | Art classroomg | 20 | 10 | 0.18 | 0.7 | | | Auditoriums | 150 | 5 | 0.06 | — | | | Classrooms (ages 5 through 8) | 25 | 10 | 0.12 | — | | | Classrooms (age 9 plus) | 35 | 10 | 0.12 | — | | | Computer lab | 25 | 10 | 0.12 | — | | | Corridors (see "Public spaces") | — | — | — | — | | | Day care (through age 4) | 25 | 10 | 0.18 | — | | | Lecture classroom | 65 | 7.5 | 0.06 | — | | | Lecture hall (fixed seats) | 150 | 7.5 | 0.06 | — | | | Locker/dressing roomsg | — | — | — | 0.25 | | | Media center | 25 | 10 | 0.12 | — | | | Multiuse assembly | 100 | 7.5 | 0.06 | — | | | Music/theater/dance | 35 | 10 | 0.06 | — | | | Science laboratoriesg | 25 | 10 | 0.18 | 1.0 | | | Smoking loungesb | 70 | 60 | — | — | | | Sports locker roomsg | — | — | — | 0.5 | | | Wood/metal shopsg | 20 | 10 | 0.18 | 0.5 | | Food and beverage service | | | | | | | | Bars, cocktail lounges | 100 | 7.5 | 0.18 | — | | | Cafeteria, fast food | 100 | 7.5 | 0.18 | — | | | Dining rooms | 70 | 7.5 | 0.18 | — | | | Kitchens (cooking)b | 20 | 7.5 | 0.12 | 0.7 | | Hotels, motels, resorts, and dormitories | | | | | | | | Bathrooms/toilets—privateg | — | — | — | 25/50f | | | Bedroom/living room | 10 | 5 | 0.06 | — | | | Conference/meeting | 50 | 5 | 0.06 | — | | | Dormitory sleeping area | 20 | 5 | 0.06 | — | | | Gambling casinos | 120 | 7.5 | 0.18 | — | | | Lobbies/prefunction | 30 | 7.5 | 0.06 | — | | | Multipurpose assembly | 120 | 50 | 0.06 | — | | Offices | | | | | | | | Conference rooms | 50 | 5 | 0.06 | — | | | Kitchenettesk | 25 | 5 | 0.06 | 0.30 | | | Office spaces | 5 | 5 | 0.06 | — | | | Reception areas | 30 | 5 | 0.06 | — | | | Telephone/data entry | 60 | 5 | 0.06 | — | | | Main entry lobbies | 10 | 5 | 0.06 | — | | Private dwellings, single and multiple | | | | | | | | Garages, common for multiple unitsb | — | — | — | 0.75 | | | Kitchensb | | | | See Table 403.4.7 | | | Living areasc | | See Table 403.4.2 | — | — | | | Toilet rooms and bathroomsg | — | — | | See Table 403.4.7 | | Public spaces | | | | | | | | Corridors serving other than Group R occupancies | — | — | 0.06 | — | | | Corridors serving Group R dwelling or sleeping units with whole house exhaust system | — | — | 0.12 | — | | | Corridors serving Group R dwelling or sleeping units with other than whole house exhaust system | — | — | 0.06 | — | | | Courtrooms | 70 | 5 | 0.06 | — | | | Elevator car | — | — | — | 1.0 | | | Elevator lobbies in parking garage | — | — | 1.0 | — | | | Legislative chambers | 50 | 5 | 0.06 | — | | | Libraries | 10 | 5 | 0.12 | — | | | Museums (children's) | 40 | 7.5 | 0.12 | — | | | Museums/galleries | 40 | 7.5 | 0.06 | — | | | Places of religious worship | 120 | 5 | 0.06 | — | | | Shower room (per showerhead)g | — | — | — | 50/20f | | | Smoking loungesb | 70 | 60 | — | — | | | Toilet rooms—Publicg | — | — | — | 50/70e | | Retail stores, sales floors, and showroom floors | | | | | | | | Dressing rooms | — | — | — | 0.25 | | | Mall common areas | 40 | 7.5 | 0.06 | — | | | Sales | 15 | 7.5 | 0.12 | — | | | Shipping and receiving | 2 | 10 | 0.12 | — | | | Smoking loungesb | 70 | 60 | — | — | | | Storage rooms | — | — | 0.12 | — | | | Warehouses (see "Storage") | — | 10 | 0.06 | — | | Specialty shops | | | | | | | | Automotive motor fuel-dispensing stationsb | — | — | — | 1.5 | | | Barber | 25 | 7.5 | 0.06 | 0.5 | | | Beauty salonsb | 25 | 20 | 0.12 | 0.6 | | | Embalming roomsb | — | — | — | 2.0 | | | Nail salonsb,h | 25 | 20 | 0.12 | 0.6 | | | Pet shops (animal areas)b | 10 | 7.5 | 0.18 | 0.9 | | | Supermarkets | 8 | 7.5 | 0.06 | — | | Sports and amusement | | | | | | | | Disco/dance floors | 100 | 20 | 0.06 | — | | | Bowling alleys (seating areas) | 40 | 10 | 0.12 | — | | | Game arcades | 20 | 7.5 | 0.18 | — | | | Ice arenas, without combustion enginesj | — | — | 0.30 | 0.5 | | | Gym, stadium, arena (play area)j | 7 | 20 | 0.18 | — | | | Spectator areas | 150 | 7.5 | 0.06 | — | | | Swimming pools (pool and deck area) | — | — | 0.48 | — | | | Health club/aerobics room | 40 | 20 | 0.06 | — | | | Health club/weight room | 10 | 20 | 0.06 | — | | Storage | | | | | | | | Janitor closets, trash rooms, recycling rooms | — | — | — | 1.0 | | | Repair garages, enclosed parking garageb, d | — | — | — | 0.75 | | | Storage rooms, chemical | — | — | — | 1.5 | | | Warehouses | — | — | 0.06 | — | | Theaters | | | | | | | | Auditoriums (see "Education") | — | — | — | — | | | Lobbies | 150 | 5 | 0.06 | — | | | Stages, studios | 70 | 10 | 0.06 | — | | | Ticket booths | 60 | 5 | 0.06 | — | | Transportation | | | | | | | | Platforms | 100 | 7.5 | 0.06 | — | | | Transportation waiting | 100 | 7.5 | 0.06 | — | | Workrooms | | | | | | | | Bank vaults/safe deposit | 5 | 5 | 0.06 | — | | | Darkrooms | — | — | — | 1.0 | | | Copy, printing rooms | 4 | 5 | 0.06 | 0.5 | | | Freezer and refrigerated spaces (<50°F) | 0 | 10 | 0 | 0 | | | Meat processingc | 10 | 15 | — | — | | | Pharmacy (prep. area) | 10 | 5 | 0.18 | — | | | Photo studios | 10 | 5 | 0.12 | — | | | Computer (without printing) | 4 | 5 | 0.06 | — |

| For SI: | | 1 cubic foot per minute = 0.0004719 m3/s, 1 ton = 908 kg, 1 cubic foot per minutes per square foot = 0.00508 m3/(s•m2), °C = [(°F) -32]/1.8, 1 square foot - 0.0929 m2. | | --- | --- | --- | | a. | | Based upon net occupiable floor area. | | b. | | Mechanical exhaust required and the recirculation of air from such spaces is prohibited. Recirculation of air that is contained completely within such spaces shall not be prohibited (see Section 403.2.1, Item 3). | | c. | | Spaces unheated or maintained below 50°F are not covered by these requirements unless the occupancy is continuous. | | d. | | Ventilation systems in enclosed parking garages shall comply with Section 404. | | e. | | Rates are per water closet or urinal. The higher rate shall be provided where the exhaust system is designed to operate intermittently. The lower rate shall be permitted only where the exhaust system is designed to operate continuously while occupied. | | f. | | Rates are per room unless otherwise indicated. The higher rate shall be provided where the exhaust system is designed to operate intermittently. The lower rate shall be permitted only where the exhaust system is designed to operate continuously while occupied. | | g. | | Mechanical exhaust is required and recirculation from such spaces is prohibited. For occupancies other than science laboratories, where there is a wheel-type energy recovery ventilation (ERV) unit in the exhaust system design, the volume of air leaked from the exhaust airstream into the outdoor airstream within the ERV shall be less than 10 percent of the outdoor air volume. Recirculation of air that is contained completely within such spaces shall not be prohibited (see Section 403.2.1, Items 2 and 4). | | h. | | For nail salons, each manicure and pedicure station shall be provided with a source capture system capable of exhausting not less than 50 cfm per station. Exhaust inlets shall be located in accordance with Section 502.20. Where one or more required source capture systems operate continuously during occupancy, the exhaust rate from such systems shall be permitted to be applied to the exhaust flow rate required by Table 403.3.1.1 for the nail salon. | | i. | | Reserved. | | j. | | When combustion equipment is intended to be used on the playing surface, additional dilution ventilation and/or source control shall be provided. | | k. | | Kitchenettes require exhaust when they contain a domestic cooking appliance range or oven that is installed in accordance with Table 507.1.2. Kitchenettes that only contain a microwave cooking appliance are not required to have exhaust. A kitchenette may not contain commercial cooking appliances that require Type I or Type II exhaust as these occupancies are required to be exhausted to the kitchen category in Table 403.3.1.1. |

403.3.1.1.2.3 Multiple zone recirculating systems. For ventilation systems wherein one or more air handlers supply a mixture of outdoor air and recirculated air to more than one ventilation zone, the outdoor air intake flow (Vot) shall be determined in accordance with Sections 403.3.1.1.2.3.1 through 403.3.1.1.2.3.4.

403.3.1.1.2.3.1 Uncorrected outdoor air intake. The uncorrected outdoor air intake flow (Vot) shall be determined in accordance with Equation 4-5.

Vou = D∑all zones(Rp × Pz) + ∑all zones(Ra × Az)(Equation 4-5)

403.3.1.1.2.3.1.1 Occupant diversity. The occupant diversity ratio (D) shall be determined in accordance with Equation 4-6 to account for variations in population within the ventilation zones served by the system.

D = Ps/∑all zonesPz(Equation 4-6)

where:

Ps = System population: The total population in the area served by the system.

| EXCEPTION: | Alternative methods to account for occupant diversity shall be permitted, provided the resulting Vouvalue is no less than that determined using Equation 4-5. | | --- | --- |

403.3.1.1.2.3.1.2 Design system population. Design system population (Ps) shall equal the largest (peak) number of people expected to occupy all ventilation zones served by the ventilation system during use.

Note: Design system population is always equal to or less than the sum of design zone population for all zones in the area served by the system because all zones may or may not be simultaneously occupied at design population.

403.3.1.1.2.3.2 System ventilation efficiency. The system ventilation efficiency (Ev) shall be determined in accordance with Section 403.3.1.1.2.3.3 for the Simplified Procedure or Appendix A of ASHRAE 62.1 for the Alternative Procedure.

Note: These procedures also establish zone minimum primary airflow rates for VAV systems.

403.3.1.1.2.3.3 Simplified procedure.

403.3.1.1.2.3.3.1 System ventilation efficiency. System ventilation efficiency (Ev) shall be determined in accordance with Equation 4-6a or 4-6b.

Ev = 0.88 × D + 0.22 for D < 0.60 (Equation 4-6a)

Ev = 0.75 for D ≥ 0.60 (Equation 4-6b)

403.3.1.1.2.3.3.2 Zone minimum primary airflow. For each zone, the minimum primary airflow (Vpz-min) shall be determined in accordance with Equation 4-7.

Vpz-min = Voz × 1.5 (Equation 4-7)

403.3.1.1.2.3.4 Outdoor air intake. The design outdoor air intake flow (Vot) shall be determined in accordance with Equation 4-8.

Vot = Vou/Ev(Equation 4-8)

403.3.2 Group R-2, R-3 and R-4 occupancies. This section is not adopted. See Section 403.4.

403.3.2.1 Outdoor air for dwelling units. This section is not adopted.

403.3.2.2 Outdoor air for other spaces. This section is not adopted.

403.3.2.3 Local exhaust. This section is not adopted.

403.3.2.4 System controls. This section is not adopted.

403.4 Group R whole house mechanical ventilation system. Each dwelling unit or sleeping unit shall be equipped with a whole house mechanical ventilation system that complies with Sections 403.4.1 through 403.4.6. Each dwelling unit or sleeping unit shall be equipped with local exhaust complying with Section 403.4.7. All occupied spaces, including public corridors, other than the Group R dwelling units and/or sleeping units, that support these Group R occupancies shall meet the natural ventilation requirements of Section 402 or the mechanical ventilation requirements of Sections 403.1 through 403.3.

| EXCEPTION: | Alternate balanced whole house ventilation systems and local exhaust systems subject to the Washington State Energy Code, Residential Provisions serving Group R dwelling units designed and commissioned in accordance with ASHRAE Standard 62.2 are permitted. | | --- | --- |

403.4.1 System design. The whole house ventilation system shall consist of one or more supply fans, one or more exhaust fans, or an ERV/HRV with integral fans; and the associated ducts and controls. Local exhaust fans shall be permitted to serve as part of the whole house ventilation system when provided with the proper controls in accordance with Section 403.4.5. The systems shall be designed and installed to supply and exhaust the minimum outdoor airflow rates in accordance with Section 403.4.2 as corrected by the balanced and/or distributed whole house ventilation system coefficients in accordance with Section 403.4.3 where applicable.

Table 403.4.2

WHOLE HOUSE MECHANICAL VENTILATION AIRFLOW RATE

(CONTINUOUSLY OPERATING SYSTEMS)

| Floor Area (ft2) | | Bedroomsa | | | | | | | | | | | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | | 1 | | 2 | | 3 | | 4 | | ˃5 | | | | | <500 | | 30 | | 30 | | 35 | | 45 | | 50 | | | 500 - 1000 | | 30 | | 35 | | 40 | | 50 | | 55 | | | 1001 - 1500 | | 30 | | 40 | | 45 | | 55 | | 60 | | | 1501 - 2000 | | 35 | | 45 | | 50 | | 60 | | 65 | | | 2001 - 2500 | | 40 | | 50 | | 55 | | 65 | | 70 | | | 2501 - 3000 | | 45 | | 55 | | 60 | | 70 | | 75 | | | 3001 - 3500 | | 50 | | 60 | | 65 | | 75 | | 80 | | | 3501 - 4000 | | 55 | | 65 | | 70 | | 80 | | 85 | | | 4001 - 4500 | | 60 | | 70 | | 75 | | 85 | | 90 | | | 4501 - 5000 | | 65 | | 75 | | 80 | | 90 | | 95 | | | a Minimum airflow (Qr) is set at not less than 30 cfm for each dwelling units. | | | | | | | | | | | |

403.4.2 Whole house mechanical ventilation rates. The sleeping unit whole house mechanical ventilation minimum outdoor airflow rate shall be determined in accordance with the breathing zone ventilation rates minimum outdoor airflow rate shall be determined in accordance with the breathing zone ventilation rates requirements of Section 403.3.1.1.1.2 using Equation 4-2. The dwelling unit whole house mechanical ventilation minimum outdoor airflow rate shall be determined in accordance with Equation 4-10 or Table 403.4.2.

Qr = 0.01Afloor + 7.5(Nbr + 1) (Equation 4-10)

| where: | | | | --- | --- | --- | | Qr | = | Ventilation airflow rate, cubic feet per minute (cfm) but not less than 30 cfm for each dwelling unit. | | Afloor | = | Conditioned floor area, square feet (ft2) | | Nbr | = | Number of bedrooms, not less than one. |

Table 403.4.3

SYSTEM COEFFICIENT (Csystem)

| System Type | Distributed | Not Distributed | | --- | --- | --- | | Balanced | 1.0 | 1.25 | | Not Balanced | 1.25 | 1.5 |

403.4.3 Ventilation quality adjustment. The minimum whole house ventilation rate from Section 403.4.2 shall be adjusted by the system coefficient in Table 403.4.3 based on the system type not meeting the definition of a balanced whole house ventilation system and/or not meeting the definition of a distributed whole house ventilation system.

Qv = Qr* Csystem(Equation 4-11)

| where: | | | | --- | --- | --- | | Qv | = | Quality-adjusted ventilation airflow rate in cubic feet per minute (cfm) | | Qr | = | Ventilation airflow rate, cubic feet per minute (cfm) from Equation 4-10 or Table 403.4.2 | | Csystem | = | System coefficient from Table 403.4.3 |

403.4.4 Whole house ventilation residential occupancies. Residential dwelling and sleeping unit whole house ventilation systems shall meet the requirements of Sections 403.4.4.1 or 403.4.4.2 depending on the occupancy of the residential unit.

403.4.4.1 Whole house ventilation in Group R-2 occupancies. Residential dwelling and sleeping units in Group R-2 occupancies system shall include supply and exhaust fans and be a balanced whole house ventilation system in accordance with Section 403.4.6.3. The system shall include a heat or energy recovery ventilator with a sensible heat recovery effectiveness as prescribed in Section C403.3.6 or when selected as an option of R406 of the Washington State Energy Code. The whole house ventilation system shall operate continuously at the minimum ventilation rate determined in accordance with Section 403.4. The whole house supply fan shall provide ducted outdoor ventilation air to each habitable space within the residential unit.

| EXCEPTIONS: | 1. Interior adjoining spaces that are ventilated from another habitable space are not required to have outdoor air ducted directly to the adjoining space. These systems are considered not distributed whole house ventilation systems and shall use the "not distributed" quality adjustment system coefficient in accordance with Section 403.4.3. | | --- | --- | | | 2. Interior adjacent rooms that are ventilated from another habitable space are not required to have outdoor air ducted directly to the interior adjacent room. These systems are considered not distributed whole house ventilation systems and shall use the "not distributed" quality adjustment system coefficient in accordance with Section 403.4.3. The interior adjacent room shall be provided with a transfer fan with a minimum airflow rate of 30 cfm or with relief air inlet with a minimum airflow of 20 cfm that is connected to the exhaust/relief air inlet of an ERV/HRV whole house ventilation system. Transfer fans that ventilate interior adjacent rooms shall meet the sone rating in Section 403.4.6 and shall have whole house ventilation controls in accordance with Section 403.4.5. |

403.4.4.2 Whole house ventilation for other than Group R-2 occupancies. Residential dwelling and sleeping units in other than Group R-2 occupancies, including I-1 condition 2 occupancies, shall have a whole house mechanical ventilation system with supply and exhaust fans in accordance with Section 403.4.6.1, 403.4.6.2, 403.4.6.3, or 403.4.6.4. The whole house ventilation system shall operate continuously at the minimum ventilation rate determined in accordance with Section 403.4.2 unless configured with intermittent off controls in accordance with Section 403.4.6.5. The whole house supply fan shall provide ducted outdoor ventilation air to each habitable space within the residential unit.

| EXCEPTIONS: | 1. Interior adjoining spaces that are ventilated from another habitable space are not required to have outdoor air ducted directly to the adjoining space. These systems are considered not distributed whole house ventilation systems and shall use the "not distributed" quality adjustment system coefficient in accordance with Section 403.4.3. | | --- | --- | | | 2. Interior adjacent rooms that are ventilated from another habitable space are not required to have outdoor air ducted directly to the interior adjacent room. These systems are considered not distributed whole house ventilation systems and shall use the "not distributed" quality adjustment system coefficient in accordance with Section 403.4.3. The interior adjacent room shall be provided with a transfer fan with a minimum airflow rate of 30 cfm or with relief air inlet with a minimum airflow of 20 cfm that is connected to the exhaust/relief air inlet of an ERV/HRV whole house ventilation system. Transfer fans that ventilate interior adjacent rooms shall meet the sone rating in Section 403.4.6 and shall have whole house ventilation controls in accordance with Section 403.4.5. |

403.4.5 Whole house ventilation controls.

1. The whole house ventilation system shall be controlled with manual switches, timers or other means that provide for automatic operation of the ventilation system that are readily accessible by the occupant;

2. Whole house mechanical ventilation system shall be provided with controls that enable manual override off of the system by the occupant during periods of poor outdoor air quality. Controls shall include permanent text or a symbol indicating their function. Recommended control permanent labeling to include text similar to the following: "Leave on unless outdoor air quality is very poor." Manual controls shall be provided with ready access for the occupant.

| EXCEPTION: | Central whole house mechanical systems with supply air and/or exhaust that serve more than one dwelling or sleep units are not required to have manual override off controls accessible to the occupant. | | --- | --- |

3. Whole house ventilation systems shall be configured to operate continuously except where intermittent off controls are provided in accordance with Section 403.4.6.5 and allowed by Section 403.4.4.2.

403.4.6 Whole house ventilation system component requirements. Whole house ventilation supply and exhaust fans specified in this section shall have a minimum efficacy as prescribed in the Washington State Energy Code. The fans shall be rated for sound at a maximum of 1.0 sone at design airflow and static pressure conditions. Design and installation of the system or equipment shall be carried out in accordance with manufacturer's installation instructions.

| EXCEPTIONS: | 1. Central supply or exhaust fans serving multiple residential units do not need to comply with the maximum fan sone requirements. | | --- | --- | | | 2. Interior joining spaces provided with a 30 cfm transfer fan or a 25 square foot permanent opening do not require supply ventilation air directly to the space. Transfer fans shall meet the sone rating above and have whole house ventilation controls in accordance with Section 403.4.5. |

403.4.6.1 Exhaust fans. Exhaust fans required shall be ducted directly to the outside in accordance with Section 501.3. Exhaust air outlets shall be designed to limit the pressure difference to the outside to limiting the outlet free area maximum velocity to 500 feet per minute and equipped with backdraft dampers or motorized dampers in accordance with Washington State Energy Code. Exhaust fans shall be tested and rated in accordance with HVI 915, HVI 916, and HVI 920. Exhaust fans required in this section may be used to provide local ventilation. Exhaust fans serving spaces other than kitchens that are designed for intermittent exhaust rates in Table 403.4.7 shall be provided with occupancy sensors, humidity sensors, timer controls, or pollutant sensor controls to automatically override the fan to the high speed airflow rate. The exhaust fans shall be tested and the testing results shall be submitted and posted in accordance with Section 403.4.6.7.

| EXCEPTIONS: | 1. Central exhaust fans serving multiple residential units do not need to comply with the HVI testing requirements. | | --- | --- | | | 2. Inlet free area maximum velocity may exceed 500 feet per minute when a factory-built combined exhaust/intake termination fitting is used. |

403.4.6.2 Supply fans. Supply fans used in meeting the requirements of this section shall supply outdoor air from intake openings in accordance with Sections 401.4 and 401.5. Intake air openings shall be designed to limit the pressure difference to the outside to limiting the inlet free area maximum velocity to 500 feet per minute and when designed for intermittent off operation shall be equipped with motorized dampers in accordance with the Washington State Energy Code. Supply fans shall be tested and rated in accordance with HVI 915, HVI 916, and HVI 920. Where outdoor air is provided to each habitable dwelling unit or sleeping unit by supply fan systems the outdoor air shall be filtered. The filter shall be provided with access for regular maintenance and replacement. The filter shall have a Minimum Efficiency Rating Value (MERV) of at least 8.

| EXCEPTION: | Central supply fans serving multiple residential units do not need to comply with the HVI testing requirements. | | --- | --- |

403.4.6.3 Balanced whole house ventilation system. A balanced whole house ventilation system shall include both supply and exhaust fans. The supply and exhaust fans shall have airflow that is within 10 percent of each other. The tested and balanced total mechanical exhaust airflow rate is within 10 percent or 5 cfm, whichever is greater, of the total mechanical supply airflow rate. The flow rate test results shall be submitted and posted in accordance with Section 403.4.6.7. The exhaust fan shall meet the requirements of Section 403.4.6.1. The supply fan shall meet the requirements of Section 403.4.6.2. For Group R-2 dwelling and sleeping units, the system is required to have balanced whole house ventilation but is not required to have distributed whole house ventilation where the not distributed system coefficient from Table 403.4.3 is utilized to correct the whole house mechanical ventilation rate. The system shall be designed and balanced to meet the pressure equalization requirements of Section 501.4. Local exhaust systems that are not a component of the whole-house mechanical ventilation system are exempt from the balanced airflow calculation.

403.4.6.4 Furnace integrated supply. Systems using space condition heating and/or cooling air handler fans for outdoor air supply air distribution are not permitted.

| EXCEPTION: | Air handler fans shall be permitted that have multi-speed or variable speed supply airflow control capability with a low speed operation not greater than 25 percent of the rated supply air flow capacity during ventilation only operation. Outdoor air intake openings must meet the provisions of Sections 401.4 and 401.5 and must include a motorized damper that is activated by the whole house ventilation system controller. Intake air openings shall be designed to limit the pressure difference to the outside to limiting the inlet free area maximum velocity to 500 ft per min. The motorized damper must be controlled to maintain the outdoor airflow intake airflow within 10 percent of the whole house mechanical exhaust airflow rate. The supply air handler shall provide supply air to each habitable space in the residential unit. The whole house ventilation system shall include exhaust fans in accordance with Section 403.4.6.1 to meet the pressure equalization requirements of Section 501.4. The flow rate for the outdoor air intake must be tested and verified at the minimum ventilation fan speed and the maximum heating or cooling fan speed. The results of the test shall be submitted and posted in accordance with Section 403.4.6.7. | | --- | --- |

403.4.6.5 Intermittent off operation. Whole house mechanical ventilation systems shall be provided with advanced controls that are configured to operate the system with intermittent off operation and shall operate for a least two hours in each four-hour segment. The whole house ventilation airflow rate determined in accordance with Section 403.4.2 as corrected by Section 403.4.3 shall be multiplied by the factor determined in accordance with Table 403.4.6.5.

Table 403.4.6.5

INTERMITTENT WHOLE HOUSE MECHANICAL VENTILATION RATE FACTORSa,b

| Run-time Percentage in Each 4-hour Segment | 50% | 66% | 75% | 100% | | --- | --- | --- | --- | --- | | Factora | 2 | 1.5 | 1.3 | 1.0 |

| a | For ventilation system run-time values between those given, the factors are permitted to be determined by interpolation. | | --- | --- | | b | Extrapolation beyond the table is prohibited. |

403.4.6.6 Testing. Whole house mechanical ventilation systems shall be tested, balanced and verified to provide a flow rate not less than the minimum required by Sections 403.4.2 and 403.4.3. Testing shall be performed according to the ventilation equipment manufacturer's instructions, or by using a flow hood, flow grid, or other airflow measuring device at the mechanical ventilation fan's inlet terminals, outlet terminals or grilles or in the connected ventilation ducts. Where required by the building official, testing shall be conducted by an approved third party. A written report of the results of the test shall be signed by the party conducting the test and provided to the building official and shall be posted in the residential unit in accordance with Section 403.4.6.7.

403.4.6.7 Certificate. A permanent certificate shall be completed by the mechanical contractor, test and balance contractor or other approved party and posted on a wall in the space where the furnace is located, a utility room, or an approved location inside the building. When located on an electrical panel, the certificate shall not cover or obstruct the visibility of the circuit directory label, service disconnect label, or other required labels. The certificate shall list the flow rate determined from the delivered airflow of the whole house mechanical ventilation system as installed and the type of mechanical whole house ventilation system used to comply with Section 403.4.3.

403.4.7 Local exhaust. Bathrooms, toilet rooms and kitchens shall include a local exhaust system. Such local exhaust systems shall have the capacity to exhaust the minimum airflow rate in accordance with Table 403.4.7 and Table 403.3.1.1, including notes. Fans required by this section shall be provided with controls that enable manual override or automatic occupancy sensor, humidity sensor, timer controls, or pollutant sensor controls. An "on/off" switch shall meet this requirement for manual controls. Manual fan controls shall be provided with ready access in the room served by the fan.

Table 403.4.7

MINIMUM EXHAUST RATES

| Area to be exhausted | Exhaust Rate | | | --- | --- | --- | | Intermittent | Continuous | | | Open kitchens | In accordance with Section 403.4.7.3 | Not permitted | | Enclosed kitchens | In accordance with Section 403.4.7.3 | 5 ACH based on kitchen volume | | Bathrooms - Toilet rooms | 50 cfm | 20 cfm |

403.4.7.1 Whole house exhaust controls. If the local exhaust fan is included in a whole house ventilation system in accordance with Section 403.4.6, the exhaust fan shall be controlled to operate as specified in Section 403.4.5.

403.4.7.2 Local exhaust fans. Exhaust fans shall meet the following criteria.

1. Exhaust fans shall be tested and rated in accordance with HVI 915, HVI 916, and HVI 920 or equivalent.

2. Fan airflow rating and duct system shall be designed and installed to deliver at least the exhaust airflow required by Table 403.4.7. The airflows required refer to the delivered airflow of the system as installed and tested using a flow hood, flow grid, or other airflow measurement device. Local exhaust systems shall be tested and verified to provide a flow rate not less than the minimum required by this section.

3. Design and installation of the system or equipment shall be carried out in accordance with manufacturers' installation instructions.

4. Intermittent local exhaust system serving kitchens shall be rated for sound at a maximum of 3 sones at one or more airflow settings not less than 100 cfm at a static pressure not less than that determined at working speed as specified in HVI 916 Section 7.2.

5. Continuous local exhaust system serving kitchens shall be rated for sound at a maximum of 1 sone at one or more airflow settings not less than 100 cfm at a static pressure not less than that determined at working speed as specified in HVI 916 Section 7.2.

| EXCEPTIONS: | 1. The installed airflow is not required to be field-verified where an exhaust airflow rating at a pressure of 0.25 in. w.g. may be used, provided the duct sizing meets the prescriptive requirements of Table 403.4.7.2. | | --- | --- | | | 2. Remote mounted fans need not meet sound requirements. To be considered for this exception, a remote mounted fan shall be mounted outside the kitchen, and there shall be at least 4 feet (1 m) of ductwork between the fan and the intake grille. |

Table 403.4.7.2

PRESCRIPTIVE EXHAUST DUCT SIZING

| Fan Tested cfm at 0.25 inches w.g. | Minimum Flex Diameter | Maximum Length in Feet | Minimum Smooth Diameter | Maximum Length in Feet | Maximum Elbowsa | | | | | | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | | 50 | | 4 inches | | 25 | 4 inches | | 70 | 3 | | | 50 | | 5 inches | | 90 | 5 inches | | 100 | 3 | | | 50 | | 6 inches | | No Limit | 6 inches | | No Limit | 3 | | | 80 | | 4 inchesb | | NA | 4 inches | | 20 | 3 | | | 80 | | 5 inches | | 15 | 5 inches | | 100 | 3 | | | 80 | | 6 inches | | 90 | 6 inches | | No Limit | 3 | | | 100 | | 5 inchesb | | NA | 5 inches | | 50 | 3 | | | 100 | | 6 inches | | 45 | 6 inches | | No Limit | 3 | | | 125 | | 6 inches | | 15 | 6 inches | | No Limit | 3 | | | 125 | | 7 inches | | 70 | 7 inches | | No Limit | 3 | |

| a. | For each additional elbow, subtract 10 feet from length. | | --- | --- | | b. | Flex ducts of this diameter are not permitted with fans of this size. |

403.4.7.3 Local intermittent kitchen exhaust system. Kitchen range hoods for domestic cooking appliances shall meet or exceed either the minimum airflow or the minimum capture efficiency in accordance with Table 403.4.7.3. Capture efficiency ratings shall be determined in accordance with ASTM E3087.

| EXCEPTION: | Other intermittent kitchen exhaust fans, including downdraft, shall meet or exceed 300 cfm airflow. | | --- | --- |

Table 403.4.7.3

Kitchen Range Hood Airflow Rates (CFM) and ASTM E3087 Capture Efficiency (CE) Ratings According to Kitchen Range Fuel Type

| Hood Over Electric Range | Hood Over Combustion Range | | --- | --- | | 65 percent CE or 160 cfm | 80 percent CE or 250 cfm |

403.4.7.3.1 Field verification and diagnostic testing for local intermittent kitchen exhaust system. The local exhaust system for kitchens shall be installed to comply with local mechanical exhaust requirements specified in Section 403.4.7.3 and shall be field verified in accordance with the procedures below to confirm the model is rated by HVI or AHAM to comply with the following requirements:

1. Local intermittent exhaust system for kitchens shall be tested and verified to provide a minimum airflow rate or capture efficiency required by Section 403.4.7.3. Testing shall include verification of the maximum sound rating as specified in Section 403.4.7.2. Testing for the intermittent kitchen exhaust systems shall occur with the whole house ventilation system operating and with all dwelling unit or sleeping unit entry doors closed. Testing for exhaust systems that require mechanical makeup air in accordance with Section 505.4 shall include verifying that the mechanical makeup air opening is open. Testing for exhaust systems that require mechanical makeup air in accordance with Section 505.4 shall include verifying that the mechanical makeup air system is controlled to automatically start. Testing for exhaust systems that do not require mechanical makeup air in accordance with Section 505.4 and that are exempt from pressurize equalization per Section 501.4 shall be tested with operable openings manually opened unless design exhaust airflow can be achieved with all operable openings closed. Where required by the building official, testing shall be conducted by an approved third party. A written report of the results of the test shall be signed by the party conducting the test and provided to the building official.

| EXCEPTION: | The installed airflow is not required to be field-verified where an exhaust airflow rating at a pressure of 0.25 in. w.g. is used, provided the duct sizing meets the prescriptive requirements of Table 403.4.7.2. | | --- | --- |

2. The verification shall utilize certified rating data from HVI Publication 911, AHAM-Certified Range Hood Directory, or another directory of certified product performance ratings approved by the code official for determining compliance. The verification procedure shall consist of visual inspection of the local intermittent kitchen exhaust system to verify and record the following information:

2.1. The manufacturer name and model number.

2.2. The model is listed in the HVI, AHAM, or equivalent directory.

2.3. The rated airflow value listed in the HVI, AHAM, or equivalent directory.

2.4. The sound rating value listed in the HVI, AHAM, or equivalent directory.

2.5. If the value for the rated airflow given in the directory is greater than or equal to the airflow requirements specified in Section 403.4.7.3 and if the value for the sone rating given in the directory is less than or equal to the sone rating requirements specified in Section 403.4.7.2, then the local intermittent kitchen exhaust system complies, otherwise the local intermittent kitchen exhaust system does not comply.

Reviser's note: The brackets and enclosed material in the text of the above section occurred in the copy filed by the agency.

Wash. Admin. Code § 51-52-0404 Section 404—Enclosed parking garages and automobile repair facilities.

404.4 Automobile repair facilities. In buildings used for the repair of automobiles, each repair stall shall be equipped with an exhaust extension duct, extending to the outside of the building. Exhaust extension duct over 10 feet in length shall mechanically exhaust at least 300 cfm. Connecting offices and waiting rooms shall be supplied with conditioned air under positive pressure.

History

• Statutory Authority: RCW 19.27.031, 19.27.074 and chapters 19.27 and 34.05 RCW. WSR 13-04-053, § 51-52-0404, filed 2/1/13, effective 7/1/13. Statutory Authority: RCW 19.27.190, 19.27.074, 19.27.031 and chapters 19.27 and 34.05 RCW. WSR 10-03-099, § 51-52-0404, filed 1/20/10, effective 7/1/10.

Wash. Admin. Code § 51-52-0407 Section 407—Ambulatory care facilities and Group I-2 occupancies.

407.1 General. Mechanical ventilation for health care facilities licensed by Washington state shall be designed and installed in accordance with this code and the following provisions of the Washington Administrative Code (WAC):

1. Mechanical ventilation in ambulatory care facilities shall comply with chapter 246-330 WAC.

2. Mechanical ventilation for acute care hospitals shall comply with chapter 246-320 WAC.

3. Mechanical ventilation for nursing homes shall comply with chapter 388-97 WAC.

Mechanical ventilation for unlicensed ambulatory care facilities shall be designed and installed in accordance with this code and ASHRAE 170.

History

• Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 16-01-148, § 51-52-0407, filed 12/21/15, effective 7/1/16.

Wash. Admin. Code § 51-52-0501 Section 501—General.

501.3.1 Location of exhaust outlets. The termination point of exhaust outlets and ducts discharging to the outdoors shall be located with the following minimum distances:

1. For ducts conveying explosive or flammable vapors, fumes or dusts: 30 feet (9144 mm) from the property line; 10 feet (3048 mm) from operable openings into the building; 6 feet (1829 mm) from exterior walls and roofs; 30 feet (9144 mm) from combustible walls and operable openings into the building which are in the direction of the exhaust discharge; 10 feet (3048 mm) above adjoining grade.

2. For other product-conveying outlets: 10 feet (3048 mm) from property lines; 3 feet (914 mm) from exterior walls and roofs; 10 feet (3048 mm) from operable openings into the building; 10 feet (3048 mm) above adjoining grade.

3. For environmental air exhaust other than enclosed parking garage and transformer vault exhaust: 3 feet (914 mm) from property lines, 3 feet (914 mm) from operable openings into buildings for all occupancies other that Group U, and 10 feet (3048 mm) from mechanical air intakes. Such exhaust shall not be considered hazardous or noxious. Separation is not required between intake air openings and living space exhaust air openings of an individual dwelling unit or sleeping unit where an approved factory-built intake/exhaust combination termination fitting is used to separate the air streams in accordance with the manufacturer's instructions.

| EXCEPTIONS: | 1. The separation between an air intake and exhaust outlet on a single listed package HVAC unit. | | --- | --- | | | 2. Exhaust from environmental air systems other than garages may be discharged into an open parking garage. | | | 3. Except for Group I occupancies, where ventilation system design circumstances require building HVAC air to be relieved, such as during economizer operation, such air may be relieved into an open or enclosed parking garage within the same building. |

4. Exhaust outlets serving structures in flood hazard areas shall be installed at or above the elevation required by Section 1612 of the International Building Code for utilities and attendant equipment.

5. For enclosed parking garage exhaust system outlets and transformer vault exhaust system outlets: 10 feet (3048 mm) from property lines which separate one lot from another; 10 feet (3048 mm) from operable openings into buildings; 3 feet (914 mm) horizontally from, 10 feet above, or 10 feet below adjoining finished walkways.

6. For transformer vault exhaust system outlets, subject to the requirements of NFPA 70 Section 450.45: Ten feet (3048 mm) from fire escapes, required means of egress at the exterior of the building, elements of exit discharge, exterior combustible materials, and openings that are not protected in accordance with Section 705.8 of the International Building Code; 10 feet (3048 mm) from property lines which separate one lot from another; 10 feet (3048 mm) from operable openings into buildings; 10 feet (3048 mm) above walkways.

7. For elevator machinery rooms in enclosed or open parking garages: Exhaust outlets may discharge air directly into the parking garage.

8. For specific systems see the following sections:

8.1. Clothes dryer exhaust, Section 504.4.

8.2. Kitchen hoods and other kitchen exhaust equipment, Sections 506.3.13, 506.4 and 506.5.

8.3. Dust stock and refuse conveying systems, Section 511.2.

8.4. Subslab soil exhaust systems, Section 512.4.

8.5. Smoke control systems, Section 513.10.3.

8.6. Refrigerant discharge, Section 1105.7.

8.7. Machinery room discharge, Section 1105.6.1.

501.4 Pressure equalization. Mechanical exhaust systems shall be sized to remove the quantity of air required by this chapter to be exhausted. The system shall operate when air is required to be exhausted. Where mechanical exhaust is required in a room or space, such space shall be maintained with a neutral or negative pressure. If a greater quantity of air is supplied by a mechanical ventilating supply system than is removed by a mechanical exhaust for a room, adequate means shall be provided for the natural or mechanical exhaust of the excess air supplied. If only a mechanical exhaust system is installed for a room or if a greater quantity of air is removed by a mechanical exhaust system than is supplied by a mechanical ventilating supply system for a room, adequate makeup air consisting of supply air, transfer air or outdoor air shall be provided to satisfy the deficiency. The calculated building infiltration rate shall not be used to satisfy the requirements of this section.

| EXCEPTION: | Intermittent kitchen exhaust, intermittent domestic dryer exhaust, and intermittent local exhaust systems in R-3 occupancies and dwelling units in R-2 occupancies are excluded from the pressure equalization requirement unless required by Section 504 or Section 505. | | --- | --- |

History

• Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 23-23-105, § 51-52-0501, filed 11/15/23, effective 3/16/24
• WSR 23-02-055, 23-12-106, and 23-20-025, § 51-52-0501, filed 1/3/23, 6/7/23, and 9/25/23, effective 3/15/24
• WSR 20-03-041, § 51-52-0501, filed 1/8/20, effective 7/1/20. Statutory Authority: RCW 19.27.031, 19.27.074 and chapters 19.27 and 34.05 RCW. WSR 13-04-053, § 51-52-0501, filed 2/1/13, effective 7/1/13. Statutory Authority: RCW 19.27.190, 19.27.074, 19.27.031 and chapters 19.27 and 34.05 RCW. WSR 10-03-099, § 51-52-0501, filed 1/20/10, effective 7/1/10. Statutory Authority: RCW 19.27.190, 19.27.020, and chapters 19.27 and 34.05 RCW. WSR 07-01-092, § 51-52-0501, filed 12/19/06, effective 7/1/07. Statutory Authority: RCW 19.27.020, 19.27.031, 19.27.074 and chapters 19.27 and 34.05 RCW. WSR 05-01-015, § 51-52-0501, filed 12/2/04, effective 7/1/05.

Wash. Admin. Code § 51-52-0504 Section 504—Clothes dryer exhaust.

504.4 Exhaust installation. Dryer exhaust ducts for clothes dryers shall terminate on the outside of the building and shall be equipped with a backdraft damper located where the duct terminates. Dryer exhaust ducts may terminate at exterior wall louvers with openings spaced not less than 1/2-inch in any direction.

Screens shall not be installed at the duct termination. Ducts shall not be connected or installed with sheet metal screws or other fasteners that will obstruct the exhaust flow. Clothes dryer exhaust ducts shall not be connected to a vent connector, vent or chimney. Clothes dryer exhaust ducts shall not extend into or through ducts or plenums.

Domestic dryer exhaust ducts may terminate at a common location where each duct has an independent back-draft damper.

504.11 Common exhaust systems for clothes dryers located in multistory structures. Where a common multistory duct system is designed and installed to convey exhaust from multiple clothes dryers, the construction of the system shall be in accordance with all of the following:

1. The shaft in which the duct is installed shall be constructed and fire-resistance rated as required by the International Building Code.

2. Dampers shall be prohibited in the exhaust duct. Penetrations of the shaft and ductwork shall be protected in accordance with Section 607.5.5, Exception 2.

3. Rigid metal ductwork shall be installed within the shaft to convey the exhaust. The ductwork shall be constructed of sheet steel having a minimum thickness of 0.0187 inch (0.4712 mm) (No. 26 gage) and in accordance with SMACNA Duct Construction Standards.

4. The ductwork within the shaft shall be designed and installed without offsets.

5. The exhaust fan motor design shall be in accordance with Section 503.2.

6. The exhaust fan motor shall be located outside of the airstream.

7. The exhaust fan shall run continuously, and shall be connected to a standby power source.

8. Exhaust fan operation shall be monitored in an approved location and shall initiate an audible or visual signal when the fan is not in operation.

9. Makeup air shall be provided for the exhaust system to maintain the minimum flow for the exhaust fan when the dryers are not operating. Additionally, makeup air shall be provided when required by Section 504.7.

10. A cleanout opening shall be located at the base of the shaft to provide access to the duct to allow for cleaning and inspection. The finished opening shall be not less than 12 inches by 12 inches (305 mm by 305 mm).

11. Screens shall not be installed at the termination.

12. The common multistory duct system shall serve only clothes dryers and shall be independent of other exhaust systems.

History

• Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 23-02-055, 23-12-106, and 23-20-025, § 51-52-0504, filed 1/3/23, 6/7/23, and 9/25/23, effective 3/15/24
• WSR 16-01-148, § 51-52-0504, filed 12/21/15, effective 7/1/16. Statutory Authority: RCW 19.27.031, 19.27.074 and chapters 19.27 and 34.05 RCW. WSR 13-04-053, § 51-52-0504, filed 2/1/13, effective 7/1/13. Statutory Authority: RCW 19.27.190, 19.27.074, 19.27.031 and chapters 19.27 and 34.05 RCW. WSR 10-03-099, § 51-52-0504, filed 1/20/10, effective 7/1/10. Statutory Authority: RCW 19.27.190, 19.27.020, and chapters 19.27 and 34.05 RCW. WSR 07-01-092, § 51-52-0504, filed 12/19/06, effective 7/1/07.

Wash. Admin. Code § 51-52-0505 Section 505—Domestic cooking exhaust equipment.

505.3 Domestic exhaust ducts. Ducts serving domestic cooking exhaust equipment shall discharge to the outdoors through sheet metal ducts constructed of galvanized steel, stainless steel, aluminum or copper. Such ducts shall have smooth inner walls, shall be airtight, shall be equipped with a backdraft damper and shall be independent of all other exhaust systems.

Domestic kitchen exhaust ducts may terminate with other domestic dryer exhaust and residential local exhaust ducts at a common location where each duct has an independent back-draft damper.

Listed and labeled exhaust booster fans shall be permitted when installed in accordance with the manufacturer's installation instructions.

| EXCEPTIONS: | 1. In other than Group I-1 and I-2, where installed in accordance with the manufacturer's installation instructions and where continuous local exhaust is provided in an enclosed kitchen in accordance with Table 403.4.7, listed and labeled ductless range hoods shall not be required to discharge to the outdoors. The local exhaust from the residential dwelling or sleeping unit kitchen area may be combined with other exhaust ductwork where the exhaust register/grille in the kitchen is a minimum of 6 feet (1.8 M) from the domestic range cooktop. The exhaust register/grille shall be provided with a minimum MERV 3 filter or mesh filter (washable) for trapping grease. | | --- | --- | | | 2. Ducts for domestic kitchen cooking appliances equipped with downdraft exhaust systems shall be permitted to be constructed of Schedule 40 PVC pipe and fittings provided that the installation complies with all of the following: | | | 2.1. The duct shall be installed under a concrete slab poured on grade. | | | 2.2. The underfloor trench in which the duct is installed shall be completely backfilled with sand or gravel. | | | 2.3. The PVC duct shall extend not more than 1 inch (25 mm) above the indoor concrete floor surface. | | | 2.4. The PVC duct shall extend not more than 1 inch (25 mm) above grade outside of the building. | | | 2.5. The PVC ducts shall be solvent cemented. |

History

• Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 23-02-055, 23-12-106, and 23-20-025, § 51-52-0505, filed 1/3/23, 6/7/23, and 9/25/23, effective 3/15/24
• WSR 16-01-148, § 51-52-0505, filed 12/21/15, effective 7/1/16. Statutory Authority: RCW 19.27.031, 19.27.074 and chapters 19.27 and 34.05 RCW. WSR 13-04-053, § 51-52-0505, filed 2/1/13, effective 7/1/13. Statutory Authority: RCW 19.27.190, 19.27.074, 19.27.031 and chapters 19.27 and 34.05 RCW. WSR 10-03-099, § 51-52-0505, filed 1/20/10, effective 7/1/10.

Wash. Admin. Code § 51-52-0506 Section 506—Commercial kitchen hood ventilation system ducts and exhaust equipment.

506.3.2.4 Vibration isolation. A vibration isolation connector for connecting a duct to a fan shall consist of noncombustible packing in a metal sleeve joint of approved design or shall be a coated-fabric flexible duct connector rated for continuous duty at temperature of not less than 1500°F (816°C). Vibration isolation connectors shall be installed only at the connection of a duct to a fan inlet or outlet.

506.3.9 Grease duct cleanout location, spacing and installation.

506.3.9.1 Grease duct horizontal cleanout. Cleanouts located on horizontal sections of ducts shall:

1. Be spaced not more than 20 feet (6096 mm) apart.

2. Be located not more than 10 feet (3048 mm) from changes in direction that are greater than 45 degrees (0.79 rad).

3. Be located on the bottom only where other locations are not available and shall be provided with internal damming of the opening such that grease will flow past the opening without pooling. Bottom cleanouts and openings shall be approved for the application and installed liquid-tight.

4. Not be closer than 1 inch (25.4 mm) from the edges of the duct.

5. Have dimensions of not less than 12 inches by 12 inches (305 mm by 305 mm). Where such dimensions preclude installation, the openings shall be not less than 12 inches (305 mm) on one side and shall be large enough to provide access for cleaning and maintenance.

6. Shall be located at grease reservoirs.

7. Be located within 3 feet (914 mm) of horizontal discharge fans.

506.3.9.2 Grease duct vertical cleanouts. Where ducts pass vertically through floors, cleanouts shall be provided. A minimum of one cleanout shall be provided on each floor. Cleanout openings shall be not less than 1 1/2 inches (38 mm) from all outside edges of the duct or welded seams.

506.3.11 Grease duct enclosures. A commercial kitchen grease duct serving a Type I hood that penetrates a ceiling, wall, floor or any concealed spaces shall be enclosed from the point of penetration to the outlet terminal. In-line exhaust fans not located outdoors shall be enclosed as required for grease ducts. A duct shall penetrate exterior walls only at locations where unprotected openings are permitted by the International Building Code. The duct enclosure shall serve a single grease duct and shall not contain other ducts, piping or wiring systems. Duct enclosures shall be a shaft enclosure in accordance with Section 506.3.11.1, a field-applied enclosure assembly in accordance with Section 506.3.11.2 or a factory-built enclosure assembly in accordance with Section 506.3.11.3. Duct enclosures shall have a fire-resistance rating of not less than that of the assembly penetrated. The duct enclosure need not exceed 2 hours but shall not be less than 1 hour. Fire dampers and smoke dampers shall not be installed in grease ducts.

| EXCEPTION: | A duct enclosure shall not be required for a grease duct that penetrates only a nonfire-resistance-rated roof/ceiling assembly. | | --- | --- |

History

• Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 23-02-055, 23-12-106, and 23-20-025, § 51-52-0506, filed 1/3/23, 6/7/23, and 9/25/23, effective 3/15/24
• WSR 20-03-041, § 51-52-0506, filed 1/8/20, effective 7/1/20
• WSR 16-01-148, § 51-52-0506, filed 12/21/15, effective 7/1/16. Statutory Authority: RCW 19.27.031, 19.27.074 and chapters 19.27 and 34.05 RCW. WSR 13-04-053, § 51-52-0506, filed 2/1/13, effective 7/1/13. Statutory Authority: RCW 19.27.190, 19.27.074, 19.27.031 and chapters 19.27 and 34.05 RCW. WSR 10-03-099, § 51-52-0506, filed 1/20/10, effective 7/1/10. Statutory Authority: RCW 19.27.190, 19.27.020, and chapters 19.27 and 34.05 RCW. WSR 07-01-092, § 51-52-0506, filed 12/19/06, effective 7/1/07.

Wash. Admin. Code § 51-52-0507 Section 507—Commercial kitchen hoods.

507.1.2 Domestic cooking appliances used for commercial purposes. Domestic cooking appliances utilized for commercial purposes shall be provided with Type I, Type II or residential hoods as required for the type of appliances and processes in accordance with Table 507.1.2 and Sections 507.2 and 507.3. Domestic cooking appliances utilized for domestic purposes shall comply with Section 505.

TABLE 507.1.2

TYPE OF HOOD REQUIRED FOR DOMESTIC COOKING APPLIANCES

IN THE FOLLOWING SPACESa, b

| Type of Space | Type of Cooking | Type of Hood | | --- | --- | --- | | Church | 1. Boiling, steaming and warming precooked food | Type II hood | | | 2. Roasting, pan frying and deep frying | Type I hood | | Community or party room in apartment and condominium | 1. Boiling, steaming and warming precooked food | Residential hoodc or Type II hoodd | | | 2. Roasting, pan frying and deep frying | Type I hood | | Day care | 1. Boiling, steaming and warming precooked food | Residential hoodc or Type II hoodd | | | 2. Roasting, pan frying and deep frying | Type I hood | | Dormitory, boarding home, nursing home | 1. Boiling, steaming and warming precooked food | Type II hood | | | 2. Roasting, pan frying and deep frying | Type I hood | | Office lunch room | 1. Boiling, steaming and warming precooked food | Residential hoodc or Type II hoodd | | | 2. Roasting, pan frying and deep frying | Type I hood |

| | a Commercial cooking appliances shall comply with Section 507.2. | | --- | --- | | | b Requirements in this table apply to electric or gas fuel appliances only. Solid fuel appliances or charbroilers require Type I hoods. | | | c Residential hood shall ventilate to the outside. | | | d Type II hood required when more than one appliance is used. |

507.2 Type I hoods. Type I hoods shall be installed where cooking appliances produce grease or smoke as a result of the cooking process. Type I hoods shall be installed over medium-duty, heavy-duty and extra-heavy-duty cooking appliances.

| EXCEPTIONS: | 1. A Type I hood shall not be required for an electric cooking appliance where an approved testing agency provides documentation that the appliance effluent contains 5 mg/m3 or less of grease when tested at an exhaust flow rate of 500 cfm in accordance with Section 17 of UL 710B. | | --- | --- | | | 2. A Type I hood shall not be required in an R-2 type occupancy with not more than 16 residents. |

History

• Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 16-01-148, § 51-52-0507, filed 12/21/15, effective 7/1/16. Statutory Authority: RCW 19.27.031, 19.27.074 and chapters 19.27 and 34.05 RCW. WSR 13-04-053, § 51-52-0507, filed 2/1/13, effective 7/1/13. Statutory Authority: RCW 19.27.190, 19.27.074, 19.27.031 and chapters 19.27 and 34.05 RCW. WSR 10-03-099, § 51-52-0507, filed 1/20/10, effective 7/1/10.

Wash. Admin. Code § 51-52-0515 Section 515—Waste or linen chute venting.

515.1 General. Waste or linen chutes shall be gravity vented in accordance with NFPA 82.

| EXCEPTION: | Waste or linen chutes may be mechanically ventilated by an exhaust fan in accordance with Section 713.13.7 of the International Building Code. | | --- | --- |

History

• Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 23-02-055, 23-12-106, and 23-20-025, § 51-52-0515, filed 1/3/23, 6/7/23, and 9/25/23, effective 3/15/24
• WSR 20-03-041, § 51-52-0515, filed 1/8/20, effective 7/1/20
• WSR 16-01-148, § 51-52-0515, filed 12/21/15, effective 7/1/16.

Wash. Admin. Code § 51-52-0601 Section 601—General.

601.2 Air movement in egress elements. Corridors shall not serve as supply, return, exhaust, relief or ventilation air ducts.

| EXCEPTIONS: | 1. Use of a corridor as a source of makeup air for exhaust systems in rooms that open directly onto such corridors, including toilet rooms, bathrooms, dressing rooms, smoking lounges and janitor closets, shall be permitted provided that each such corridor is directly supplied with outdoor air at a rate greater than the rate of makeup air taken from the corridor. | | --- | --- | | | 2. Where located within a dwelling unit, the use of corridors for conveying return air shall not be prohibited. | | | 3. Where located within tenant spaces of one thousand square feet (93 m2) or less in area, utilization of corridors for conveying return air is permitted. | | | 4. Transfer air movement required to maintain pressurization difference within health care facilities in accordance with ASHRAE 170. | | | 5. Where such air is part of an engineered smoke control system. | | | 6. Air supplied to corridors serving residential occupancies shall not be considered as providing ventilation air to the dwelling units and sleeping units subject to the following: | | | 6.1 The air supplied to the corridor is one hundred percent outside air; and | | | 6.2 The units served by the corridor have conforming ventilation air independent of the air supplied to the corridor; and | | | 6.3 For other than high-rise buildings, the supply fan will automatically shut off upon activation of corridor smoke detectors installed in accordance with Section 606.2.4; or | | | 6.4 For high-rise buildings, the supply fan will automatically shut off upon activation of the smoke detectors required by International Fire Code Section 907.2.12.1 or upon receipt of another approved fire alarm signal. The supply fan is not required to be automatically shut off when used as part of an approved building stairwell or elevator hoistway pressurization system. Corridor smoke detectors shall be installed in accordance with Section 606.2.5. |

History

• Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 23-02-055, 23-12-106, and 23-20-025, § 51-52-0601, filed 1/3/23, 6/7/23, and 9/25/23, effective 3/15/24. Statutory Authority: RCW 19.27.031, 19.27.074, and chapter 19.27 RCW. WSR 22-09-009, § 51-52-0601, filed 4/8/22, effective 5/9/22. Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 20-03-041, § 51-52-0601, filed 1/8/20, effective 7/1/20
• WSR 16-01-148, § 51-52-0601, filed 12/21/15, effective 7/1/16. Statutory Authority: RCW 19.27.031, 19.27.074 and chapters 19.27 and 34.05 RCW. WSR 13-04-053, § 51-52-0601, filed 2/1/13, effective 7/1/13. Statutory Authority: RCW 19.27.190, 19.27.074, 19.27.031 and chapters 19.27 and 34.05 RCW. WSR 10-03-099, § 51-52-0601, filed 1/20/10, effective 7/1/10. Statutory Authority: RCW 19.27.190, 19.27.020, and chapters 19.27 and 34.05 RCW. WSR 07-01-092, § 51-52-0601, filed 12/19/06, effective 7/1/07. Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 04-01-104, § 51-52-0601, filed 12/17/03, effective 7/1/04.

Wash. Admin. Code § 51-52-0602 Section 602—Plenums.

602.1 General. Supply, return, exhaust, relief and ventilation air plenums shall be limited to uninhabited crawl spaces, areas above a ceiling or below the floor, attic spaces and mechanical equipment rooms. Plenums shall be limited to one fire area. Air systems that serve multiple fire areas shall be ducted from the boundary of the fire area served directly to the air-handling equipment. Fuel-fired appliances shall not be installed within a plenum.

History

• Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 23-23-105, § 51-52-0602, filed 11/15/23, effective 3/16/24
• WSR 16-01-148, § 51-52-0602, filed 12/21/15, effective 7/1/16.

Wash. Admin. Code § 51-52-0603 Section 603—Duct construction and installation.

603.5.1 Gypsum ducts. The use of gypsum boards to form air shafts (ducts) shall be limited to return air systems where the air temperatures do not exceed 125ºF (52ºC) and the gypsum board surface temperature is maintained above the airstream dew-point temperature. Supply air ducts formed by gypsum boards shall not be incorporated in air-handling systems utilizing direct evaporativecooling systems.

| EXCEPTION: | In other than Group I-2 occupancies, gypsum boards may be used for ducts that are only used for stairwell or elevator pressurization supply air. The gypsum duct shall not attach directly to the equipment. | | --- | --- |

History

• Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 23-02-055, 23-12-106, and 23-20-025, § 51-52-0603, filed 1/3/23, 6/7/23, and 9/25/23, effective 3/15/24. Statutory Authority: RCW 19.27.190, 19.27.074, 19.27.031 and chapters 19.27 and 34.05 RCW. WSR 10-03-099, § 51-52-0603, filed 1/20/10, effective 7/1/10.

Wash. Admin. Code § 51-52-0605 Section 605—Air filters.

605.1 General. Air handlers and ventilation systems shall be provided with approved air filters in accordance with Section 605.4. Filters shall be installed such that all return air, recirculated air, outdoor air and makeup air is filtered upstream from any heat exchanger or coil. Filters shall be installed in an approved convenient location. Liquid adhesive coatings used on filters shall have a flash point not lower than 325°F (163°C).

| EXCEPTIONS: | 1. Cooling coils that are designed, controlled and operated to provide sensible cooling only do not require filtration at the terminal device. | | --- | --- | | | 2. Ambient air that enters the building through intentional openings for natural ventilation or by infiltration is not required to be filtered. | | | 3. Recirculated air serving systems without wetted cooling coils or with unducted heater (hydronic coils, fossil fuel heating elements or electric resistance heating elements) do not require filtration at the terminal device. |

605.4 Particulate matter removal. Particulate matter filters or air cleaners shall have a minimum efficiency reporting value (MERV) of not less than the following:

1. MERV 13 for ducted air handlers and ventilation systems serving occupiable spaces in Groups A, B, E, M, R and I occupancies.

2. MERV 8 for ducted air handlers and ventilation systems serving occupiable spaces in Groups F, H, S, and U occupancies.

3. MERV 4 for unducted air handlers and fan coil units.

| EXCEPTIONS: | 1. Ducted air handlers and ventilation systems 500 cfm or less shall have a filter not less than MERV 8. | | --- | --- | | | 2. Recirculated air at fan powered variable air volume terminal units with hydronic heating coils or electric resistance heating elements shall have a filter not less than MERV 8. | | | 3. Exhaust or relief air upstream of a heat exchanger or coil shall have a filter not less than MERV 6. |

History

• Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 23-02-055, 23-12-106, and 23-20-025, § 51-52-0605, filed 1/3/23, 6/7/23, and 9/25/23, effective 3/15/24
• WSR 20-03-041, § 51-52-0605, filed 1/8/20, effective 7/1/20
• WSR 16-01-148, § 51-52-0605, filed 12/21/15, effective 7/1/16. Statutory Authority: RCW 19.27.031, 19.27.074 and chapters 19.27 and 34.05 RCW. WSR 13-04-053, § 51-52-0605, filed 2/1/13, effective 7/1/13.

Wash. Admin. Code § 51-52-0606 Section 606—Smoke detection systems control.

606.2.1 Return air systems. Smoke detectors shall be installed in return air systems with a design capacity greater than 2,000 cfm (0.9 m3/s), in the return air duct or plenum upstream of any filters, exhaust air connections, outdoor air connections, or decontamination equipment and appliances.

| EXCEPTIONS: | 1. Smoke detectors are not required in the return air system where all portions of the building served by the air distribution system are protected by area smoke detectors connected to a fire alarm system in accordance with the International Fire Code. The area smoke detection system shall comply with Section 606.4. | | --- | --- | | | 2. Smoke detectors are not required in the air system where all of the air is exhausted and not recirculated back to any portion of the building. Additionally, smoke detectors are not required in the supply system that provides the make-up air for the exhaust system. |

606.2.2 Common supply and return air systems. Where multiple air-handling systems share common supply or return air ducts or plenums with a combined design capacity greater than 2,000 cfm (0.9 m3/s), the return air system shall be provided with smoke detectors in accordance with Section 606.2.1.

| EXCEPTION: | Individual smoke detectors shall not be required for each fan-powered terminal unit, provided that such units do not have an individual design capacity greater than 2,000 cfm (0.9 m3/s) and will be shut down by activation of one of the following: | | --- | --- | | | 1. Smoke detectors required by Sections 606.2.1 and 606.2.3. | | | 2. An approved area smoke detector system located in the return air plenum serving such units. | | | 3. An area smoke detector system as prescribed in the exception to Section 606.2.1. |

In all cases, the smoke detectors shall comply with Sections 606.4 and 606.4.1.

The shutdown of fan-powered terminal units may be performed by a building automation system upon activation of smoke detection as described in Section 606.2.2, Exception Items 1, 2, or 3. The building automation system is not required to be listed as a smoke control system and is not required to comply with UL 864.

606.2.4 Corridors serving Group R occupancies in other than high-rise buildings. Corridors that serve Group R occupancies in other than high-rise buildings and that are mechanically ventilated with supply air shall be equipped with smoke detectors spaced in accordance with NFPA 72. The supply fan shall automatically shut off upon activation of the corridor smoke detectors.

| EXCEPTION: | Corridor smoke detection is not required when air is returned back to the supply fan from the corridor and return air smoke detectors are installed in the return air duct or plenum upstream of any filters, exhaust air connections, outdoor air connections, or decontamination equipment and appliances designed to automatically shut off the supply fan. | | --- | --- |

606.2.5 Corridors serving Group R occupancies in high-rise buildings. Corridors that serve Group R occupancies in high-rise buildings and that are mechanically ventilated with supply air shall be equipped with smoke detectors that are spaced in accordance with NFPA 72 and air supply inlets to the corridor shall be provided with smoke/fire dampers. The supply inlet smoke/fire dampers shall automatically close upon activation of the corridor smoke detectors.

| EXCEPTIONS: | 1. Corridor smoke detection is not required to close the supply inlet smoke/fire dampers when the smoke/fire dampers are used as part of an approved building stairwell or elevator hoistway pressurization smoke control system. 2. Corridor smoke detection is not required when air is returned back to the supply fan from the corridor and return air smoke detectors are installed in the return air duct or plenum upstream of any filters, exhaust air connections, outdoor air connections, or decontamination equipment and appliances designed to automatically shut off the supply fan. | | --- | --- |

History

• Statutory Authority: RCW 19.27.031, 19.27.074, and chapter 19.27 RCW. WSR 22-09-009, § 51-52-0606, filed 4/8/22, effective 5/9/22. Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 16-01-148, § 51-52-0606, filed 12/21/15, effective 7/1/16. Statutory Authority: RCW 19.27.190, 19.27.074, 19.27.031 and chapters 19.27 and 34.05 RCW. WSR 10-03-099, § 51-52-0606, filed 1/20/10, effective 7/1/10.

Wash. Admin. Code § 51-52-0607 Section 607—Ducts and transfer openings.

607.5.2 Fire barriers. Ducts and air transfer openings that penetrate fire barriers shall be protected with listed fire dampers installed in accordance with their listing. Ducts and air transfer openings shall not penetrate enclosures for interior exit stairways and ramps and exit passageways except as permitted by Sections 1023.5 and 1024.6, respectively, of the International Building Code.

| EXCEPTION: | Fire dampers are not required at penetrations of fire barriers where any of the following apply: | | --- | --- | | | 1. Penetrations are tested in accordance with ASTM E119 or UL 263 as part of the fire-resistance-rated assembly. | | | 2. Ducts are used as part of an approved smoke control system in accordance with Section 513 and where the fire damper would interfere with the operation of the smoke control system. | | | 3. Such walls are penetrated by fully ducted HVAC systems, have a required fire-resistance rating of 1 hour or less, are in areas of other than Group H and are in buildings equipped throughout with an automatic sprinkler system in accordance with Section 903.3.1.1 or 903.3.1.2 of the International Building Code. For the purposes of this exception, a fully ducted HVAC system shall be a duct system for the structure's HVAC system. Such a duct system shall be constructed of sheet steel not less than 26 gage (0.0217 inch (0.55 mm)) thickness and shall be continuous from the air-handling appliance or equipment to the air outlet and inlet terminals. Flexible air connectors shall be permitted in a fully ducted system, limited to the following installations: | | | 3.1. Nonmetallic flexible connections that connect a duct to an air handling unit or equipment located within a mechanical room or located outdoors in accordance with Section 603.9. | | | 3.2. Nonmetallic flexible air connectors in accordance with Section 603.6.2 that connect an overhead metal duct to a diffuser, grille, or register where the metal duct and diffuser, grille, or register are located within the same room. |

607.5.3 Fire partitions. Ducts and air transfer openings that penetrate fire partitions shall be protected with listed fire dampers installed in accordance with their listing.

| EXCEPTION: | In occupancies other than Group H, fire dampers are not required where any of the following apply: | | --- | --- | | | 1. Corridor walls in buildings equipped throughout with an automatic sprinkler system in accordance with Section 903.3.1.1 or 903.3.1.2 of the International Building Code and the duct is protected as a through penetration in accordance with Section 714 of the International Building Code. | | | 2. The partitions are tenant partitions in covered and open mall buildings where the walls are not required by provisions elsewhere in the International Building Code to extend to the underside of the floor or roof sheathing, slab, or deck above. | | | 3. The duct system is constructed of approved materials in accordance with Section 603 and the duct penetrating the wall complies with all of the following requirements: | | | 3.1. The duct shall not exceed 100 square inches (0.06 m2). | | | 3.2. The duct shall be constructed of steel not less than 0.0217 inch (0.55 mm) in thickness. | | | 3.3. The duct shall not have openings that communicate the corridor with adjacent spaces or rooms. | | | 3.4. The duct shall be installed above a ceiling. | | | 3.5. The duct shall not terminate at a wall register in the fire-resistance-rated wall. | | | 3.6. A minimum 12-inch-long (305 mm) by 0.060-inch-thick (1.52 mm) steel sleeve shall be centered in each duct opening. The sleeve shall be secured to both sides of the wall and all four sides of the sleeve with minimum 1.5-inch by 1.5-inch by 0.060-inch (38 mm by 38 mm by 1.52 mm) steel retaining angles. The retaining angles shall be secured to the sleeve and the wall with No. 10 (M5) screws. The annular space between the steel sleeve and the wall opening shall be filled with rock (mineral) wool batting on all sides. | | | 4. Such walls are penetrated by fully ducted HVAC systems, have a required fire-resistance rating of 1 hour or less, and are in areas of other than Group H and are in buildings equipped throughout with an automatic sprinkler system in accordance with Section 903.3.1.1 or 903.3.1.2 of the International Building Code. For the purposes of this exception, a fully ducted HVAC system shall be a duct system for conveying supply, return or exhaust air as part of the structure's HVAC system. Such a duct system shall be constructed of sheet steel not less than 26 gage (0.0217 inch (0.55 mm)) in thickness and shall be continuous from the air-handling appliance or equipment to the air outlet and inlet terminals. Flexible air connections shall be permitted in a fully ducted system, limited to the following installations: | | | 4.1. Nonmetallic flexible connections that connect a duct to an air-handling unit or equipment located within a mechanical room or located outdoors in accordance with Section 603.9. | | | 4.2. Nonmetallic flexible air connectors in accordance with Section 603.2.6 that connect an overhead metal duct to a diffuser, grille, or register where the metal duct and diffuser, grille, or register are located in the same room. Where the fully ducted HVAC system metal ductwork penetrates a corridor fire partition, the ductwork shall be continuous without openings to the corridor, to a mechanical room, or to a shaft enclosure. |

History

• Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 23-02-055, 23-12-106, and 23-20-025, § 51-52-0607, filed 1/3/23, 6/7/23, and 9/25/23, effective 3/15/24.

Wash. Admin. Code § 51-52-0915 Section 915—Engine and gas turbine-powered equipment and appliances.

915.3 Installation of emergency and legally required power systems. Emergency power systems and legally required standby power systems required by the International Building Code or International Fire Code shall be installed in accordance with the International Fire Code, NFPA 70, NFPA 110, and NFPA 111.

915.3.1 Air intakes. Air intake opening locations for combustion and radiator cooling intake air shall be located on the exterior of the building in accordance with NFPA 110 and a minimum of 5 feet from the property line.

915.3.2 Air outlets. Air outlet opening locations shall comply with the following:

1. Combustion exhaust shall be located on the exterior of the building in accordance with Section 501.3.1 Item 2 for product conveying exhaust.

2. Radiator cooling outlet air shall be located on the exterior of the building in accordance with NFPA 110, a minimum of 5 feet from the property line and a minimum of 2 feet above grade.

915.4 Installation of optional standby power systems. Optional standby power systems shall be installed in accordance with the International Fire Code, NFPA 37, NFPA 70, and NFPA 111 as applicable.

915.4.1 Air intakes. Air intake opening locations for combustion and radiator cooling intake air shall be located on the exterior of the building in accordance with NFPA 110 and a minimum of 5 feet from the property line and may be located within an open or enclosed parking garage with sufficient exterior permanent opening area to provide the intake air.

915.4.2 Air outlets. Air outlet opening locations shall comply with the following:

1. Combustion exhaust shall be located on the exterior of the building in accordance with Section 501.3.1 Item 2 for product conveying exhaust.

2. Radiator cooling outlet air shall be located a minimum of 5 feet from the property line and may be discharged into an open or enclosed parking garage with sufficient exterior permanent opening area to relieve heat from the generator.

History

• Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 23-02-055, 23-12-106, and 23-20-025, § 51-52-0915, filed 1/3/23, 6/7/23, and 9/25/23, effective 3/15/24.

Wash. Admin. Code § 51-52-0928 Reserved.

History

• Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 20-03-041, § 51-52-0928, filed 1/8/20, effective 7/1/20
• WSR 16-01-148, § 51-52-0928, filed 12/21/15, effective 7/1/16. Statutory Authority: RCW 19.27.031, 19.27.074 and chapters 19.27 and 34.05 RCW. WSR 13-04-053, § 51-52-0928, filed 2/1/13, effective 7/1/13.

Wash. Admin. Code § 51-52-1000 Chapter 10—Boilers, water heaters and pressure vessels.

| Informational Note: | Boilers and pressure vessels are regulated by chapter 70.79 RCW and chapter 296-104 WAC in addition to the requirements of this code. | | --- | --- |

1001.1 Scope. This chapter shall govern the installation, alteration and repair of boilers, water heaters and pressure vessels.

| EXCEPTIONS: | 1. Pressure vessels used for unheated water supply. | | --- | --- | | | 2. Portable unfired pressure vessels and Interstate Commerce Commission containers. | | | 3. Containers for bulk oxygen and medical gas. | | | 4. Unfired pressure vessels having a volume of 5 cubic feet (0.14 m3) or less operating at pressures not exceeding 250 pounds per square inch (psi) (1724 kPa) and located within occupancies of Groups B, F, H, M, R, S and U. | | | 5. Pressure vessels used in refrigeration systems that are regulated by Chapter 11 of this code. | | | 6. Pressure tanks used in conjunction with coaxial cables, telephone cables, power cables and other similar humidity control systems. | | | 7. Any boiler or pressure vessel subject to inspection by federal or state inspection programs. |

History

• Statutory Authority: RCW 19.27.031, 19.27.074 and chapters 19.27 and 34.05 RCW. WSR 13-04-053, § 51-52-1000, filed 2/1/13, effective 7/1/13. Statutory Authority: RCW 19.27.190, 19.27.074, 19.27.031 and chapters 19.27 and 34.05 RCW. WSR 10-03-099, § 51-52-1000, filed 1/20/10, effective 7/1/10. Statutory Authority: RCW 19.27.190, 19.27.020, and chapters 19.27 and 34.05 RCW. WSR 07-01-092, § 51-52-1000, filed 12/19/06, effective 7/1/07. Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 04-01-104, § 51-52-1000, filed 12/17/03, effective 7/1/04.

Wash. Admin. Code § 51-52-1101 Reserved.

History

• Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 23-02-055, 23-12-106, and 23-20-025, § 51-52-1101, filed 1/3/23, 6/7/23, and 9/25/23, effective 3/15/24. Statutory Authority: RCW 19.27.031, 19.27.074, and chapter 19.27 RCW. WSR 22-09-009, § 51-52-1101, filed 4/8/22, effective 5/9/22.

Wash. Admin. Code § 51-52-1105 Reserved.

History

• Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 23-02-055, 23-12-106, and 23-20-025, § 51-52-1105, filed 1/3/23, 6/7/23, and 9/25/23, effective 3/15/24
• WSR 20-03-041, § 51-52-1105, filed 1/8/20, effective 7/1/20.

Wash. Admin. Code § 51-52-1106 Section 1106—Machinery room, special requirements.

1106.4.2 Emergency ventilation system. An emergency ventilation system shall be provided at the minimum exhaust rate specified in ASHRAE 15 or Table 1106.4.2. Shutdown of the emergency ventilation system shall be by manual means.

Table 1106.4.2

MINIMUM EXHAUST RATES

| Refrigerant | Q(m/sec) | Q(cfm) | | --- | --- | --- | | R32 | 15.4 | 32,600 | | R143A | 13.6 | 28,700 | | R444A | 6.46 | 13,700 | | R444B | 10.6 | 22,400 | | R445A | 7.83 | 16,600 | | R446A | 23.9 | 50,700 | | R447A | 23.8 | 50,400 | | R451A | 7.04 | 15,000 | | R451B | 7.05 | 15,000 | | R1234yf | 7.80 | 16,600 | | R1234ze(E) | 5.92 | 12,600 |

History

• Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 23-23-105, § 51-52-1106, filed 11/15/23, effective 3/16/24
• WSR 20-03-041, § 51-52-1106, filed 1/8/20, effective 7/1/20.

Wash. Admin. Code § 51-52-1107 Section 1107—Reserved.

History

• Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 20-03-041, § 51-52-1107, filed 1/8/20, effective 7/1/20
• WSR 16-01-148, § 51-52-1107, filed 12/21/15, effective 7/1/16.

Wash. Admin. Code § 51-52-1200 Chapter 12—Hydronic piping.

1209.5 Insulation and thermal break required. Radiant floor heating and snow melt systems shall be provided with insulation and a thermal break in accordance with Sections 1209.5.1 and 1209.5.2. Concrete slab-on-grade, asphalt and paver-system type pavements shall have a minimum of R-10 insulation installed under the area to be snow melted, or R-5 insulation shall be installed under and at the slab edges of the area to be snow melted. The insulation shall be located underneath the snow and ice melt hydronic piping or cable and along all edges of the pavement where the snow and ice melt system is installed in accordance with the snow and ice melt manufacturer's instructions. Insulation R-values for slab-on-grade and suspended floor insulation shall be in accordance with the Washington State Energy Code.

1210.7.6 Expansion tanks. Shutoff valves shall be installed at connections to expansion tanks. A method of draining the expansion tank downstream of the shutoff valve shall be provided.

History

• Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 23-02-055, 23-12-106, and 23-20-025, § 51-52-1200, filed 1/3/23, 6/7/23, and 9/25/23, effective 3/15/24. Statutory Authority: RCW 19.27.031, 19.27.074, and chapter 19.27 RCW. WSR 22-09-009, § 51-52-1200, filed 4/8/22, effective 5/9/22. Statutory Authority: RCW 19.27.035 and 19.27.074. WSR 21-05-020, § 51-52-1200, filed 2/8/21, effective 3/11/21. Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 20-03-041, § 51-52-1200, filed 1/8/20, effective 7/1/20
• WSR 16-01-148, § 51-52-1200, filed 12/21/15, effective 7/1/16.

Wash. Admin. Code § 51-52-1305 Section 1305—Fuel oil system installation.

1305.7 Vent piping. Liquid fuel vent pipes shall terminate outside of buildings at a point not less than 5 feet (1524 mm) from building openings and not less than 15 feet (4572 mm) from outdoor air intakes. Outer ends of vent pipes shall terminate in a weatherproof vent cap or fitting or be provided with a weatherproof hood. Vent caps shall have a minimum free open area equal to the cross-sectional area of the vent pipe and shall not employ screens finer than No. 4 mesh. Vent pipes shall terminate sufficiently above the ground to avoid being obstructed with snow or ice. Vent pipes from tanks containing heaters shall be extended to a location where oil vapors discharging from the vent will be readily diffused. If the static head with a vent pipe filled with oil exceeds 10 pounds per square inch (psi) (69 kPa), the tank shall be designed for the maximum static head that will be imposed.

Liquid fuel vent pipes shall not be cross connected with fill pipes, lines from burners, or overflow lines from auxiliary tanks.

| EXCEPTION: | Liquid fuel vent pipes may terminate outside the building at a point not less than 2 feet from the fuel oil equipment combustion exhaust outlet. | | --- | --- |

History

• Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 23-02-055, 23-12-106, and 23-20-025, § 51-52-1305, filed 1/3/23, 6/7/23, and 9/25/23, effective 3/15/24.

Wash. Admin. Code § 51-52-1400 Reserved.

History

• Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 23-02-055, 23-12-106, and 23-20-025, § 51-52-1400, filed 1/3/23, 6/7/23, and 9/25/23, effective 3/15/24
• WSR 20-03-041, § 51-52-1400, filed 1/8/20, effective 7/1/20.

Wash. Admin. Code § 51-52-1500 Chapter 15—Referenced standards.

The following referenced standards are added to Chapter 15.

AHAM

Association of Home Appliance Manufacturers

1111 19th St. N.W., #402

Washington D.C. 20036

AHAM-Certified Range Hood

Directory. . . .403.4.7.3.1

HRH-2 Household Range Hoods . . . .403.4.7.3.1

ANCE

UL/CSA/ANCE 60335-2-40—2019 Household and Similar Electrical Appliances - Safety - Part 2-40: Particular Requirements for Electrical Heat Pumps, Air Conditioners and

Dehumidifiers . . . .1101.2

ASHRAE

62.2-2019 Ventilation and Acceptable Indoor Air Quality in Low-Rise Residential Buildings 401.4, 403.4, 403.4.7.3.3,

403.4.11

ASTM

E3087—18: Standard Test Method for Measuring Capture Efficiency of Domestic Range Hoods . . . .403.4.7.3.2, Table 403.4.7.3.2

CSA

UL/CSA/ANCE 60335-2-40—2019 Household and Similar Electrical Appliances - Safety - Part 2-40: Particular Requirements for Electrical Heat Pumps, Air Conditioners and

Dehumidifiers. . . .1101.2

HVI address:

Home Ventilating Institute

1740 Dell Range Blvd., Suite H, PMB 450

Cheyenne, WY 82009

HVI Publication 911 Certified Home Ventilating Product

Directory . . . .403.4.7.3.4

HVI 915-2020 Procedure for Loudness Testing of Residential Fan Products. . . .403.4.6.1, 403.4.6.2, 403.4.7.2

HVI 916-2020 Air Flow Test Procedure. . . .403.4.6.1,

403.4.6.2, 403.4.7.2

HVI 920-2020 Product Performance Certification Procedure Including Verification and Challenge. . . .403.4.6.1, 403.4.6.2,

403.4.7.2

NFPA

110-22 Standard for Emergency and Standby Power

Systems . . . .915.3, 915.3.1, 915.3.2

111-22 Standard on Stored Electrical Energy Emergency and Standby Power Systems . . . .915.3, 915.4

UL

864-2014 Control Units and Accessories for Fire Alarm Systems with revisions through

October 2018. . . .606.2.2

UL/CSA/ANCE 60335-2-40—2019 Household and Similar Electrical Appliances - Safety - Part 2-40: Particular Requirements for Electrical Heat Pumps, Air Conditioners and

Dehumidifiers. . . .1101.2

History

• Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 23-02-055, 23-12-106, and 23-20-025, § 51-52-1500, filed 1/3/23, 6/7/23, and 9/25/23, effective 3/15/24. Statutory Authority: RCW 19.27.031, 19.27.074, and chapter 19.27 RCW. WSR 22-09-009, § 51-52-1500, filed 4/8/22, effective 5/9/22. Statutory Authority: RCW 19.27.035 and 19.27.074. WSR 21-05-020, § 51-52-1500, filed 2/8/21, effective 3/11/21. Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 20-03-041, § 51-52-1500, filed 1/8/20, effective 7/1/20
• WSR 16-01-148, § 51-52-1500, filed 12/21/15, effective 7/1/16. Statutory Authority: RCW 19.27.031, 19.27.074 and chapters 19.27 and 34.05 RCW. WSR 13-04-053, § 51-52-1500, filed 2/1/13, effective 7/1/13. Statutory Authority: RCW 19.27.190, 19.27.074, 19.27.031 and chapters 19.27 and 34.05 RCW. WSR 10-03-099, § 51-52-1500, filed 1/20/10, effective 7/1/10.

Wash. Admin. Code § 51-52-21000 International Fuel Gas Code.

History

• Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 04-01-104, § 51-52-21000, filed 12/17/03, effective 7/1/04.

Wash. Admin. Code § 51-52-21101 Section 101 (IFGC)—General.

101.2 Scope. This code shall apply to the installation of fuel gas piping systems, fuel gas utilization equipment, gaseous hydrogen systems and regulated accessories in accordance with Section 101.2.1 through 101.2.5.

| EXCEPTIONS: | 1. Detached one- and two-family dwellings and multiple single-family dwellings (townhouses) not more than three stories high with separate means of egress and their accessory structures shall comply with the International Residential Code. | | --- | --- | | | 2. The standards for liquefied petroleum gas installations shall be the 2020 Edition of NFPA 58 (Liquefied Petroleum Gas Code) and the 2021 Edition of ANSI Z223.1/NFPA 54 (National Fuel Gas Code). |

History

• Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 23-02-055, 23-12-106, and 23-20-025, § 51-52-21101, filed 1/3/23, 6/7/23, and 9/25/23, effective 3/15/24
• WSR 16-01-148, § 51-52-21101, filed 12/21/15, effective 7/1/16. Statutory Authority: RCW 19.27.031, 19.27.074 and chapters 19.27 and 34.05 RCW. WSR 13-04-053, § 51-52-21101, filed 2/1/13, effective 7/1/13. Statutory Authority: RCW 19.27.190, 19.27.074, 19.27.031 and chapters 19.27 and 34.05 RCW. WSR 10-03-099, § 51-52-21101, filed 1/20/10, effective 7/1/10. Statutory Authority: RCW 19.27.190, 19.27.020, and chapters 19.27 and 34.05 RCW. WSR 07-01-092, § 51-52-21101, filed 12/19/06, effective 7/1/07.

Wash. Admin. Code § 51-52-21116 Section 116 (IFGC)—Stop work order.

116.4 Failure to comply. Any person who shall continue any work after having been served with a stop work order, except such work as that person is directed to perform to remove a violation or unsafe condition, shall be subject to fines established by the code official.

History

• Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 23-02-055, 23-12-106, and 23-20-025, § 51-52-21116, filed 1/3/23, 6/7/23, and 9/25/23, effective 3/15/24.

Wash. Admin. Code § 51-52-21401 Reserved.

History

• Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 20-03-041, § 51-52-21401, filed 1/8/20, effective 7/1/20
• WSR 16-01-148, § 51-52-21401, filed 12/21/15, effective 7/1/16. Statutory Authority: RCW 19.27.031, 19.27.074 and chapters 19.27 and 34.05 RCW. WSR 13-04-053, § 51-52-21401, filed 2/1/13, effective 7/1/13.

Wash. Admin. Code § 51-52-21409 Section 409 (IFGC)—Shutoff valves.

Table 409.1.1

Natural Gas Valve Standards

| Valve Standards | Appliance Shutoff Valve Application Up to 1/2 psig Pressure | Other Valve Applications | | | | | --- | --- | --- | --- | --- | --- | | Up to 1/2 psig Pressure | Up to 2 psig Pressure | Up to 5 psig Pressure | Up to 125 psig Pressure | | | | ANSI Z21.15/CGA 9.1 | X | -- | -- | -- | -- | | ASME B16.44 | X | X | Xa | Xb | -- | | ASME B16.33 | X | X | X | X | X | | ASME B16.38 | -- | X | X | X | X |

| For SI: 1 pound per square inch gauge = 6.895 cPsa | | | --- | --- | | a. | If labeled 2G. | | b. | If labeled 5G. |

History

• Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 23-23-105, § 51-52-21409, filed 11/15/23, effective 3/16/24
• WSR 23-02-055, 23-12-106, and 23-20-025, § 51-52-21409, filed 1/3/23, 6/7/23, and 9/25/23, effective 3/15/24.

Wash. Admin. Code § 51-52-21601 Reserved.

History

• Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 20-03-041, § 51-52-21601, filed 1/8/20, effective 7/1/20
• WSR 16-01-148, § 51-52-21601, filed 12/21/15, effective 7/1/16. Statutory Authority: RCW 19.27.031, 19.27.074 and chapters 19.27 and 34.05 RCW. WSR 13-04-053, § 51-52-21601, filed 2/1/13, effective 7/1/13.

Wash. Admin. Code § 51-52-21800 Chapter 8—Referenced standards.

The following referenced standards are added to Chapter 8.

ASME

B16.38-2012(R2017): Large Metallic Valves for Gas Distribution: Manually Operated, NPS 2 1/2 (DN 65) to NPS 12 (DN 300), 125 psig (8.6 bar) Maximum. . . .Table 409.1.1

History

• Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 23-02-055, 23-12-106, and 23-20-025, § 51-52-21800, filed 1/3/23, 6/7/23, and 9/25/23, effective 3/15/24.

Wash. Admin. Code § 51-52-22000 National Fuel Gas Code.

History

• Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 04-01-104, § 51-52-22000, filed 12/17/03, effective 7/1/04.

Wash. Admin. Code § 51-52-22006 Reserved.

History

• Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 20-03-041, § 51-52-22006, filed 1/8/20, effective 7/1/20. Statutory Authority: RCW 19.27.190, 19.27.020, and chapters 19.27 and 34.05 RCW. WSR 07-01-092, § 51-52-22006, filed 12/19/06, effective 7/1/07. Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 04-01-104, § 51-52-22006, filed 12/17/03, effective 7/1/04.

Chapter 51-54A State Building Code adoption and amendment of the 2021 edition of the International Fire Code.

Wash. Admin. Code § 51-54A-001 Authority.

These rules are adopted under the authority of chapter 19.27 RCW.

History

• Statutory Authority: RCW 19.27A.031, 19.27.074 and chapters 19.27 and 34.05 RCW. WSR 13-04-063, § 51-54A-001, filed 2/1/13, effective 7/1/13.

Wash. Admin. Code § 51-54A-002 Purpose.

The purpose of these rules is to implement the provisions of chapter 19.27 RCW, which provides that the State Building Code Council shall maintain the State Building Code in a status which is consistent with the purpose as set forth in RCW 19.27.020. In maintaining the codes the council shall regularly review updated versions of the codes adopted under the act, and other pertinent information, and shall amend the codes as deemed appropriate by the council.

History

• Statutory Authority: RCW 19.27A.031, 19.27.074 and chapters 19.27 and 34.05 RCW. WSR 13-04-063, § 51-54A-002, filed 2/1/13, effective 7/1/13.

Wash. Admin. Code § 51-54A-003 International Fire Code.

The 2021 edition of the International Fire Code, published by the International Code Council is hereby adopted by reference with the following additions, deletions, and exceptions.

History

• Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 22-13-093, 23-12-107, and 23-20-027, § 51-54A-003, filed 6/14/22, 6/7/23, and 9/25/23, effective 3/15/24
• WSR 19-24-058, § 51-54A-003, filed 11/27/19, effective 7/1/20
• WSR 16-05-065, § 51-54A-003, filed 2/12/16, effective 7/1/16. Statutory Authority: RCW 19.27A.031, 19.27.074 and chapters 19.27 and 34.05 RCW. WSR 13-04-063, § 51-54A-003, filed 2/1/13, effective 7/1/13.

Wash. Admin. Code § 51-54A-007 Exceptions.

The exceptions and amendments to the International Fire Code contained in the provisions of chapter 19.27 RCW shall apply in case of conflict with any of the provisions of these rules.

Codes referenced which are not adopted through RCW 19.27.031 or chapter 19.27A RCW shall not apply unless specifically adopted by the authority having jurisdiction.

The provisions of this code do not apply to temporary growing structures used solely for the commercial production of horticultural plants including ornamental plants, flowers, vegetables, and fruits. "Temporary growing structure" means a structure that has the sides and roof covered with polyethylene, polyvinyl, or similar flexible synthetic material and is used to provide plants with either frost protection or increased heat retention. A temporary growing structure is not considered a building for purposes of this code.

The provisions of this code do not apply to the construction, alteration, or repair of temporary worker housing except as provided by rule adopted under chapter 70.114A RCW or chapter 37, Laws of 1998 (2SSB 6168). "Temporary worker housing" means a place, area, or piece of land where sleeping places or housing sites are provided by an employer for his or her employees or by another person, including a temporary worker housing operator, who is providing such accommodations for employees, for temporary, seasonal occupancy, and includes "labor camps" under RCW 70.54.110.

The manufacture, storage, handling, sale and use of fireworks shall be governed by chapter 70.77 RCW and by chapter 212-17 WAC and local ordinances consistent with chapter 212-17 WAC.

History

• Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 22-13-093, 23-12-107, and 23-20-027, § 51-54A-007, filed 6/14/22, 6/7/23, and 9/25/23, effective 3/15/24
• WSR 19-24-058, § 51-54A-007, filed 11/27/19, effective 7/1/20. Statutory Authority: Chapter 19.27 RCW and RCW 19.27.031. WSR 17-10-028, § 51-54A-007, filed 4/25/17, effective 5/26/17. Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 16-05-065, § 51-54A-007, filed 2/12/16, effective 7/1/16. Statutory Authority: RCW 19.27A.031, 19.27.074 and chapters 19.27 and 34.05 RCW. WSR 13-04-063, § 51-54A-007, filed 2/1/13, effective 7/1/13.

Wash. Admin. Code § 51-54A-008 Implementation.

The International Fire Code adopted by chapter 51-54A WAC shall become effective in all counties and cities of this state on March 15, 2024.

History

• Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 23-23-106, § 51-54A-008, filed 11/15/23, effective 3/16/24
• WSR 22-13-093, 23-12-107, and 23-20-027, § 51-54A-008, filed 6/14/22, 6/7/23, and 9/25/23, effective 3/15/24
• WSR 21-11-066, § 51-54A-008, filed 5/14/21, effective 6/14/21
• WSR 19-24-058, § 51-54A-008, filed 11/27/19, effective 7/1/20
• WSR 16-03-055, § 51-54A-008, filed 1/16/16, effective 7/1/16. Statutory Authority: RCW 19.27A.031, 19.27.074 and chapters 19.27 and 34.05 RCW. WSR 13-04-063, § 51-54A-008, filed 2/1/13, effective 7/1/13.

Wash. Admin. Code § 51-54A-0101 Section 101.

Reserved.

History

• Statutory Authority: RCW 19.27.035 and 19.27.074. WSR 21-02-059, § 51-54A-0101, filed 1/4/21, effective 2/4/21. Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 20-01-162, § 51-54A-0101, filed 12/18/19, effective 7/1/20
• WSR 16-05-065, § 51-54A-0101, filed 2/12/16, effective 7/1/16. Statutory Authority: RCW 19.27A.031, 19.27.074 and chapters 19.27 and 34.05 RCW. WSR 13-04-063, § 51-54A-0101, filed 2/1/13, effective 7/1/13.

Wash. Admin. Code § 51-54A-0105 Permits.

105.5.14.1 Lithium batteries. An operational permit is required for an accumulation of more than 15 cubic feet (0.42 m) of lithium-ion and lithium metal batteries, where required by Section 322.1.

105.5.32 Mobile food preparation vehicles. A permit is required for mobile preparation vehicles equipped with appliances that produce smoke or grease-laden vapors or utilize LP-gas systems or CNG systems.

105.6.25 Underground supply piping for automatic sprinkler system. A construction permit is required for the installation of the portion of the underground water supply piping, public or private, supplying a water-based fire protection system. The permit shall apply to all underground piping and appurtenances downstream of the first control valve on the lateral piping or service line from the distribution main to 1 foot above finished floor of the facility with the fire protection system. Maintenance performed in accordance with this code is not considered to be a modification and does not require a permit.

| EXCEPTIONS: | 1. When the underground piping is installed by the aboveground piping contractor. | | --- | --- | | | 2. Underground piping that serves a fire protection system installed in accordance with NFPA 13D. |

History

• Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 23-23-106, § 51-54A-0105, filed 11/15/23, effective 3/16/24
• WSR 22-13-093, 23-12-107, and 23-20-027, § 51-54A-0105, filed 6/14/22, 6/7/23, and 9/25/23, effective 3/15/24
• WSR 21-04-003, § 51-54A-0105, filed 1/20/21, effective 2/20/21
• WSR 19-24-058, § 51-54A-0105, filed 11/27/19, effective 7/1/20. Statutory Authority: Chapter 19.27 RCW and RCW 19.27.031. WSR 17-10-028, § 51-54A-0105, filed 4/25/17, effective 5/26/17. Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 16-03-055, § 51-54A-0105, filed 1/16/16, effective 7/1/16. Statutory Authority: RCW 19.27A.031, 19.27.074 and chapters 19.27 and 34.05 RCW. WSR 13-04-063, § 51-54A-0105, filed 2/1/13, effective 7/1/13.

Wash. Admin. Code § 51-54A-0202 General definitions.

SECTION 202 GENERAL DEFINITIONS

ADULT FAMILY HOME. A dwelling, licensed by the state of Washington department of social and health services, in which a person or persons provide personal care, special care, room and board to more than one but not more than six adults who are not related by blood or marriage to the person or persons providing the services. An existing adult family home may provide services to up to eight adults upon approval from the department of social and health services under RCW 70.128.066 and in accordance with Section 903.

ALERT SIGNAL. A distinctive signal indicating the need for trained personnel and occupants to initiate a specific action, such as shelter-in-place.

ALERT SYSTEM. Approved devices, equipment and systems or combinations of systems used to transmit or broadcast an alert signal.

ASSISTED LIVING FACILITY. A home or other institution, licensed by the state of Washington, providing housing, basic services and assuming general responsibility for the safety and well-being of residents under chapters 18.20 RCW and 388-78A WAC. These facilities may provide care to residents with symptoms consistent with dementia requiring additional security measures.

CHILD CARE. For the purposes of these regulations, child care is the care of children during any period of a 24-hour day.

CHILD CARE, FAMILY HOME. A child care facility, licensed by Washington state, located in the dwelling of the person or persons under whose direct care and supervision the child is placed, for the care of 16 or fewer children, including children who reside at the home.

CLUSTER. Clusters are multiple portable school classrooms separated by less than the requirements of the building code for separate buildings.

COVERED BOAT MOORAGE. A pier or system of floating or fixed access ways to which vessels on water may be secured and any portion of which are covered by a roof.

CUSTODIAL CARE. Assistance with day-to-day living tasks; such as assistance with cooking, taking medication, bathing, using toilet facilities, and other tasks of daily living. Custodial care includes persons receiving care who have the ability to respond to emergency situations and may receive limited verbal or physical assistance. These care recipients may evacuate at a slower rate and/or who have mental and psychiatric complications.

ELECTRICAL CODE. The National Electrical Code, promulgated by the National Fire Protection Association, as adopted by rule or local ordinance under the authority of chapter 19.28 RCW.

EMERGENCY RESPONDER COMMUNICATIONS ENHANCEMENT SYSTEM (ERCES). An infrastructure solution installed within a building to enhance the communications capabilities for first responders that utilizes solutions such as a signal booster, voting receiver, base station, or other technology capable of enhancing the radio frequency (RF) to ensure effective public safety communications.

FREQUENCY. The particular waveband at which a communications system broadcasts or transmits.

FREQUENCY LICENSE HOLDER(S). The person(s) or entity(s) that are issued the license from the frequency licensing authority of United States or other country of jurisdiction for the frequencies being used by both the in-building emergency responder communications enhancement system and the emergency services communications system that it enhances.

FREQUENCY LICENSING AUTHORITY. The government authority in a country or territory that issues frequency licenses for the use of communications frequencies by authorized entities and individuals.

GRAVITY-OPERATED DROP OUT VENTS. Automatic smoke and heat vents containing heat-sensitive glazing designed to shrink and drop out of the vent openings when exposed to fire.

HOSPICE CARE CENTER. A building or portion thereof used on a 24-hour basis for the provision of hospice services to terminally ill inpatients.

LIMITED VERBAL OR PHYSICAL ASSISTANCE. Persons who, because of age, physical limitations, cognitive limitations, treatment or chemical dependency, and may not independently recognize, respond, or evacuate without limited verbal or physical assistance during an emergency situation. Verbal assistance includes prompting, giving, and repeating instructions. Physical assistance includes assistance with transfers to walking aids or mobility devices and assistance with egress.

MOBILE FOOD PREPARATION VEHICLE. Mobile food preparation vehicles that are equipped with appliances that produce smoke or grease-laden vapors or utilize LP-gas systems or CNG systems for the purpose of preparing and serving food to the public. Vehicles intended for private recreation shall not be considered mobile food preparation vehicles.

MOTOR VEHICLE. Includes, but not limited to, a vehicle, machine, tractor, trailer or semitrailer, or any combination thereof, propelled or drawn by mechanical power and designed for use upon the highways in the transportation of passengers or property. It does not include a vehicle, locomotive or car operated exclusively on a rail or rails, or a trolley bus operated by electric power derived from a fixed overhead wire, furnishing local passenger transportation similar to street-railway service. The term "motor vehicle" also includes freight containers or cargo tanks used, or intended for use, in connection with motor vehicles.

NIGHTCLUB. An A-2 Occupancy use in which the aggregate area of concentrated use of unfixed chairs and standing space that is specifically designated and primarily used for dancing or viewing performers exceeds 350 square feet (32.5 m2), excluding adjacent lobby areas. "Nightclub" does not include theaters with fixed seating, banquet halls, or lodge halls.

OCCUPANCY CLASSIFICATION. For the purposes of this code, certain occupancies are defined as follows:

Institutional Group I-1. Institutional Group I-1 occupancy shall include buildings, structures or portions thereof for more than 16 persons excluding staff, who reside on a 24-hour basis in a supervised environment and receive custodial care. Buildings of Group I-1 shall be classified as one of the occupancy conditions indicated below. This group shall include, but not be limited to, the following: Assisted living facilities licensed under chapter 388-78A WAC and residential treatment facilities licensed under chapter 246-337 WAC shall be classified as Group I-1, Condition 2.

No change to the rest of the occupancy conditions.

Group I-2. This occupancy shall include buildings and structures used for medical care on a 24-hour basis for more than five persons who are incapable of self-preservation. This group shall include, but not be limited to, the following:

Foster care facilities

Detoxification facilities

Hospice care centers

Hospitals

Nursing homes

Psychiatric hospitals

Five or fewer persons receiving care. A facility such as the above with five or fewer persons receiving such care shall be classified as Group R-3 or shall comply with the International Residential Code provided that an automatic sprinkler system is installed in accordance with Section 903.3.1.3 or with Section P2904 of the International Residential Code.

Family home child care. Family home child care licensed by Washington state for the care of 16 or fewer children shall be classified as Group R-3 or shall comply with the International Residential Code.

Adult care facility. A facility that provides accommodations for less than 24 hours for more than 5 unrelated adults and provides supervision and personal care services shall be classified as Group I-4.

| EXCEPTION: | Where the occupants are capable of responding to an emergency situation without physical assistance from the staff, the facility shall be classified as Group R-3. | | --- | --- |

Child care facility. Child care facilities that provide supervision and personal care on a less than 24-hour basis for more than 5 children 2 1/2 years of age or less shall be classified as Group I-4.

| EXCEPTIONS: | 1. A child day care facility that provides care for more than five but no more than 100 children 2 1/2 years or less of age, where the rooms in which the children are cared for are located on a level of exit discharge serving such rooms and each of these child care rooms has an exit door directly to the exterior, shall be classified as Group E. | | --- | --- | | | 2. Family child care homes licensed by Washington state for the care of 12 or fewer children shall be classified as Group R-3. |

Residential Group R. Residential Group R includes, among others, the use of a building or structure, or a portion thereof, for sleeping purposes when not classified as an Institutional Group I or when not regulated by the International Residential Code. This group shall include:

R-1 Residential occupancies containing sleeping units where the occupants are primarily transient in nature, including:

Boarding houses (transient) with more than 10 occupants

Congregate living facilities (transient) with more than 10 occupants

Hotels (transient)

Motels (transient)

R-2 Residential occupancies containing sleeping units or more than two dwelling units where the occupants are primarily permanent in nature, including:

Apartment houses

Congregate living facilities (nontransient) with more than 16 occupants

Boarding houses (nontransient) with more than 16 occupants

Convents

Dormitories

Fraternities and sororities

Monasteries

Hotels (nontransient)

Live/work units

Motels (nontransient)

Vacation timeshare properties

R-3 Residential occupancies where the occupants are primarily permanent in nature and not classified as Group R-1, R-2, R-4, or I, including:

Buildings that do not contain more than two dwelling units.

Care facilities that provide accommodations for five or fewer persons receiving care.

Congregate living facilities (nontransient) with 16 or fewer occupants.

Boarding houses (nontransient) with 16 or fewer occupants

Convents

Dormitories

Fraternities and sororities

Monasteries

Congregate living facilities (transient) with 10 or fewer occupants.

Boarding houses (transient) with 10 or fewer occupants

Lodging houses (transient) with five or fewer guestrooms and 10 or fewer occupants

Care facilities within a dwelling. Care facilities for five or fewer persons receiving care that are within a single-family dwelling are permitted to comply with the International Residential Code provided an automatic sprinkler system is installed in accordance with Section 903.3.1.3 or with Section P2904 of the International Residential Code.

Adult family homes, family home child care. Adult family homes and family home child care facilities that are within a single-family home are permitted to comply with the International Residential Code.

Foster family care homes. Foster family care homes licensed by Washington state are permitted to comply with the International Residential Code, as an accessory use to a dwelling, for six or fewer children including those of the resident family.

PORTABLE SCHOOL CLASSROOM. A prefabricated structure consisting of one or more rooms with direct exterior egress from the classroom(s). The structure is transportable in one or more sections, and is designed to be used as an educational space with or without a permanent foundation. The structure shall be capable of being demounted and relocated to other locations as needs arise.

POWERED MICROMOBILITY DEVICES. Motorized bicycles, motorized scooters, and other personal mobility devices powered by a rechargeable battery. The term does not include motor vehicles that are required to be registered with the department of motor vehicles for the state or jurisdiction.

RECALL SIGNAL. An electrically or mechanically operated signal used to recall occupants after an emergency drill or to terminate a shelter-in-place event that shall be distinct from any alarm or alert signal used to initiate an emergency plan, or other signals.

SHELTER-IN-PLACE. An emergency response used to minimize exposure of facility occupants to chemical or environmental hazards by taking refuge in predetermined interior rooms or areas where actions are taken to isolate the interior environment from the exterior hazard.

SPECIAL HAZARDS SUPPRESSION SYSTEMS. Wet-chemical systems (NFPA 17A), Dry-chemical systems (NFPA 17), Foam systems (NFPA 11), Carbon dioxide systems (NFPA 12), Halon systems (NFPA 12A), Clean-agent systems (NFPA 2001), Automatic water mist systems (NFPA 750), Aerosol fire-extinguishing systems (NFPA 2010), and Explosion prevention systems (NFPA 69).

History

• Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 26-07-067, s 51-54A-0202, filed 3/17/26, effective 4/17/26
• WSR 23-23-106, § 51-54A-0202, filed 11/15/23, effective 3/16/24
• WSR 22-13-093, 23-12-107, and 23-20-027, § 51-54A-0202, filed 6/14/22, 6/7/23, and 9/25/23, effective 3/15/24
• WSR 21-04-003, § 51-54A-0202, filed 1/20/21, effective 2/20/21
• WSR 19-24-058, § 51-54A-0202, filed 11/27/19, effective 7/1/20
• WSR 16-03-055, § 51-54A-0202, filed 1/16/16, effective 7/1/16. Statutory Authority: RCW 19.27.074, 19.27.020, and 19.27.031. WSR 14-24-090, § 51-54A-0202, filed 12/1/14, effective 5/1/15. Statutory Authority: RCW 19.27A.031, 19.27.074 and chapters 19.27 and 34.05 RCW. WSR 13-04-063, § 51-54A-0202, filed 2/1/13, effective 7/1/13.

Wash. Admin. Code § 51-54A-0301 Permits.

301.2 Permits. Permits shall be required as set forth in Section 105.5 for the activities or uses regulated by Sections 306, 307, 308, 315, 320, and 322.

History

• Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 22-13-093, 23-12-107, and 23-20-027, § 51-54A-0301, filed 6/14/22, 6/7/23, and 9/25/23, effective 3/15/24.

Wash. Admin. Code § 51-54A-0302 Definitions.

302.1 Definitions. The following terms are defined in Chapter 2:

3D PRINTER;

ADDITIVE MANUFACTURING;

BONFIRE;

HI-BOY;

HIGH-VOLTAGE TRANSMISSION LINE;

MOBILE FOOD PREPARATION VEHICLE;

OPEN BURNING;

PORTABLE OUTDOOR FIREPLACE;

POWERED INDUSTRIAL TRUCK;

RECREATIONAL FIRE;

SKY LANTERN.

History

• Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 22-13-093, 23-12-107, and 23-20-027, § 51-54A-0302, filed 6/14/22, 6/7/23, and 9/25/23, effective 3/15/24.

Wash. Admin. Code § 51-54A-0307 Open burning, recreational fires and portable outdoor fireplaces.

307.2.1 Authorization. Where required by state or local law or regulations, open burning shall only be permitted with prior approval from the state or local air and water quality management authority, provided that all conditions specified in the authorization are followed. See also chapter 173-425 WAC.

307.4.2 Recreational fires. Recreational fires shall not be conducted within 25 feet of a structure or combustible material. Conditions which could cause a fire to spread within 25 feet of a structure shall be eliminated prior to ignition. See also chapter 173-425 WAC.

History

• Statutory Authority: RCW 19.27A.031, 19.27.074 and chapters 19.27 and 34.05 RCW. WSR 13-04-063, § 51-54A-0307, filed 2/1/13, effective 7/1/13.

Wash. Admin. Code § 51-54A-0308 Open flames.

308.1.4 Open-flame cooking devices. This section is not adopted.

308.1.7 Religious ceremonies. Participants in religious ceremonies shall not be precluded from carrying hand-held candles. See RCW 19.27.031(3).

308.1.7.1 Aisles and exits. Candles shall be prohibited in areas where occupants stand, or in an aisle or exit.

| EXCEPTION: | Candles used in religious ceremonies. | | --- | --- |

308.1.9 Decorative open flame tables. Gas-fired portable or fixed open flame fire tables and fireplaces are required to be provided with approved protection devices to prevent occupants from using flame, and from flame being exposed to combustible material. A fire extinguisher shall be located within 75 feet of travel distance or as approved. Where located indoors, the supply gas valve shall be interlocked with building fire alarm and/or fire sprinklers, where provided.

History

• Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 26-07-072, s 51-54A-0308, filed 3/17/26, effective 4/17/26
• WSR 22-13-093, 23-12-107, and 23-20-027, § 51-54A-0308, filed 6/14/22, 6/7/23, and 9/25/23, effective 3/15/24
• WSR 21-04-003, § 51-54A-0308, filed 1/20/21, effective 2/20/21
• WSR 16-03-055, § 51-54A-0308, filed 1/16/16, effective 7/1/16. Statutory Authority: RCW 19.27A.031, 19.27.074 and chapters 19.27 and 34.05 RCW. WSR 13-04-063, § 51-54A-0308, filed 2/1/13, effective 7/1/13.

Wash. Admin. Code § 51-54A-0314 Indoor displays.

314.4 Vehicles. Liquid- or gas-fueled vehicles, boats, aircraft or other motorcraft shall not be located indoors except as follows:

1. The engine starting system is made inoperable or ignition batteries are disconnected except where the fire code official requires that the batteries remain connected to maintain safety features.

2. Fuel in fuel tanks does not exceed any of the following:

2.1. Class I, II, and III liquid fuel does not exceed one-quarter tank or 5 gallons (19 L), whichever is less.

2.2. LP gas does not exceed one-quarter tank or 6.6 gallons (25 L), whichever is less.

2.3. CNG does not exceed one-quarter tank or 630 cubic feet (17.8 m3), whichever is less.

2.4. Hydrogen does not exceed one-quarter tank or 2,000 cubic feet (0.57 m3), whichever is less.

3. Fuel tanks and fill openings are closed and sealed to prevent tampering.

4. Vehicles, aircraft, boats or other motorcraft equipment are not fueled or defueled within the building.

History

• Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 23-23-106, § 51-54A-0314, filed 11/15/23, effective 3/16/24
• WSR 22-13-093, 23-12-107, and 23-20-027, § 51-54A-0314, filed 6/14/22, 6/7/23, and 9/25/23, effective 3/15/24
• WSR 21-04-003, § 51-54A-0314, filed 1/20/21, effective 2/20/21
• WSR 19-24-058, § 51-54A-0314, filed 11/27/19, effective 7/1/20.

Wash. Admin. Code § 51-54A-0315 Reserved.

History

• Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 22-13-093, 23-12-107, and 23-20-027, § 51-54A-0315, filed 6/14/22, 6/7/23, and 9/25/23, effective 3/15/24
• WSR 19-24-058, § 51-54A-0315, filed 11/27/19, effective 7/1/20.

Wash. Admin. Code § 51-54A-0319 Mobile food preparation vehicles.

319.1 General. Mobile food preparation vehicles that are equipped with appliances that produce smoke or grease-laden vapors or utilize LP-gas systems or CNG systems shall comply with this section.

History

• Statutory Authority: RCW 19.27.035 and 19.27.074. WSR 21-02-059, § 51-54A-0319, filed 1/4/21, effective 2/4/21. Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 19-24-058, § 51-54A-0319, filed 11/27/19, effective 7/1/20.

Wash. Admin. Code § 51-54A-0321 Artificial combustible vegetation.

321.1 Artificial combustible vegetation on roofs and near buildings. Artificial combustible vegetation exceeding 6 feet (1829 mm) in height and permanently installed outdoors within 5 feet (1524 mm) of a building or on the roof of a building shall comply with Section 807.4.1. The placement of artificial combustible vegetation shall also comply with Sections 806.3 and 807.4.2.

| EXCEPTIONS: | 1. Artificial decorative vegetation located more than 30 feet (9144 mm) from the exterior wall of a building. | | --- | --- | | | 2. Artificial decorative vegetation used at structures regulated by the International Residential Code. |

History

• Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 22-13-093, 23-12-107, and 23-20-027, § 51-54A-0321, filed 6/14/22, 6/7/23, and 9/25/23, effective 3/15/24.

Wash. Admin. Code § 51-54A-0322 Lithium batteries.

322.1 General. The storage of lithium-ion and lithium metal batteries shall comply with Section 322.

| EXCEPTIONS: | 1. New or refurbished batteries installed in the equipment, devices, or vehicles they are designed to power. | | --- | --- | | | 2. New or refurbished batteries packed for use with the equipment, devices, or vehicles they are designed to power. | | | 3. Batteries in original retail packaging that are rated at 300 watt-hours or less for lithium-ion batteries or contain 25 grams or less of lithium metal for lithium metal batteries. | | | 4. Temporary storage of batteries or battery components during the battery manufacturing process prior to completion of final quality control checks. | | | 5. Temporary storage of batteries during the vehicle manufacturing or repair process. |

322.2 Permits. Permits shall be required for an accumulation of more than 15 cubic feet (0.42 m3) of lithium-ion and lithium metal batteries, other than batteries listed in the exceptions to Section 322.1, as set forth in Section 105.5.14.1.

322.3 Fire safety plan. A fire safety plan shall be provided in accordance with Section 403.10.6. In addition, the fire safety plan shall include emergency response actions to be taken upon detection of a fire or possible fire involving lithium-ion or lithium metal battery storage.

322.4 Storage requirements. Lithium-ion and lithium metal batteries shall be stored in accordance with Section 322.4.1, 322.4.2, or 322.4.3, as applicable.

322.4.1 Limited indoor storage in containers. Not more than 15 cubic feet (0.42 m3) of lithium-ion or lithium metal batteries shall be permitted to be stored in containers in accordance with the following:

1. Containers shall be open-top and constructed of noncombustible materials or shall be approved for battery collection.

2. Individual containers and groups of containers shall not exceed a capacity of 7.5 cubic feet (0.21 m3).

3. A second container or group of containers shall be separated by not less than 3 feet (914 mm) of open space, or 10 feet (3048 mm) of space that contains combustible materials.

4. Containers shall be located not less than 5 feet (1524 mm) from exits or exit access doors.

322.4.2 Indoor storage areas. Indoor storage areas for lithium-ion and lithium metal batteries, other than those complying with Section 322.4.1, shall comply with Sections 322.4.2.1 through 322.4.2.6.

322.4.2.1 Technical opinion and report. Where required by the fire code official a technical opinion and report complying with Section 104.8.2 shall be prepared to evaluate the fire and explosion risks associated with the indoor storage area and to make recommendations for fire and explosion protection. The report shall be submitted to the fire code official and shall require the fire code official's approval prior to issuance of a permit. In addition to the requirements of Section 104.8.2, the technical opinion and report shall specifically evaluate the following:

1. The potential for deflagration of flammable gases released during a thermal runaway event.

2. The basis of design for an automatic sprinkler system or other approved fire suppression system. Such design basis shall reference relevant full-scale fire testing or another approved method of demonstrating sufficiency of the recommended design.

322.4.2.2 Construction requirements. Where indoor storage areas for lithium-ion and lithium metal batteries are located in a building with other uses, battery storage areas shall be separated from the remainder of the building by 2-hour rated fire barriers or horizontal assemblies. Fire barriers shall be constructed in accordance with Section 707 of the International Building Code, and horizontal assemblies shall be constructed in accordance with Section 711 of the International Building Code.

| EXCEPTIONS: | 1. Where battery storage is contained in one or more approved prefabricated portable structures providing a complete two-hour fire resistance rated enclosure, fire barriers and horizontal assemblies are not required. | | --- | --- | | | 2. Where battery storage is limited to new batteries in packaging that has been demonstrated to and approved by the fire code official as sufficient to isolate a fire in packaging to the package interior, fire barriers and horizontal assemblies are not required. |

322.4.2.3 Fire protection systems. Indoor storage areas for lithium-ion and lithium metal batteries shall be protected by an automatic sprinkler system complying with Section 903.3.1.1 or an approved alternative fire suppression system. The system design shall be based on recommendations in the approved technical opinion and report required by Section 322.4.2.1.

322.4.2.4 Fire alarm systems. Indoor storage areas for lithium-ion and lithium metal batteries shall be provided with an approved automatic fire detection and alarm system complying with Section 907. The fire detection system shall use air-aspirating smoke detection, radiant energy-sensing fire detection, or both.

322.4.2.5 Explosion control. Where the approved technical opinion and report required by Section 322.4.2.1 recommends explosion control, explosion control complying with Section 911 shall be provided.

322.4.2.6 Reduced requirements for storage of partially charged batteries. Indoor storage areas for lithium-ion and lithium metal batteries with a demonstrated state of charge not exceeding 30 percent shall not be required to comply with Section 322.4.2.1, 322.4.2.2, or 322.4.2.5, provided that procedures for limiting and verifying that the state of charge will not exceed 30 percent have been approved.

322.4.3 Outdoor storage. Outdoor storage of lithium-ion or lithium metal batteries shall comply with Sections 322.4.3.1 through 322.4.3.3.

322.4.3.1 Distance from storage to exposures. Outdoor storage of lithium-ion or lithium metal batteries, including storage beneath weather protection in accordance with Section 414.6.1 of the International Building Code, shall comply with one of the following:

1. Battery storage shall be located not less than 20 feet (6096 mm) from any building, lot line, public street, public alley, public way, or means of egress.

2. Battery storage shall be located not less than 3 feet (914 mm) from any building, lot line, public street, public alley, public way, or means of egress, where the battery storage is separated by a 2-hour fire-resistance rated assembly without openings or penetrations and extending 5 feet (1524 mm) above and to the sides of the battery storage area.

3. Battery storage shall be located not less than 3 feet (914 mm) from any building, lot line, public street, public alley, public way, or means of egress, where batteries are contained in approved prefabricated portable structures providing a complete 2-hour fire-resistance rated enclosure.

322.4.3.2 Storage area size limits and separation. Outdoor storage areas for lithium-ion or lithium metal batteries, including storage beneath weather-protection in accordance with Section 414.6.1 of the International Building Code, shall not exceed 900 sq. ft. (83.6 m2). The height of battery storage in such areas shall not exceed 10 feet (3048 mm). Multiple battery storage areas shall be separated from each other by not less than 10 feet (3048 mm) of open space.

322.4.3.3 Fire detection. Outdoor storage areas for lithium-ion or lithium metal batteries, regardless of whether such areas are open, under weather protection or in a prefabricated portable structure, shall be provided with an approved automatic fire detection and alarm system complying with Section 907. The fire detection system shall use radiant energy-sensing fire detection.

History

• Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 23-23-106, § 51-54A-0322, filed 11/15/23, effective 3/16/24
• WSR 22-13-093, 23-12-107, and 23-20-027, § 51-54A-0322, filed 6/14/22, 6/7/23, and 9/25/23, effective 3/15/24.

Wash. Admin. Code § 51-54A-0323 Powered micromobility devices and powered industrial trucks.

323.1 General. Lithium-ion and lithium metal battery powered micromobility devices and powered industrial trucks shall be operated and maintained in accordance with this section.

| EXCEPTIONS: | 1. Storage, repair and charging in residential occupancies of powered mobility devices, provided that such devices are for personal use by its owner. | | --- | --- | | | 2. Charging of a single powered mobility device in any occupancy by its owner. |

323.1.1 Prohibited locations. The use of a residential occupancy as a business for the charging of commercially owned powered mobility devices or powered industrial trucks as part of a rental or sales service shall not be permitted.

323.2 Battery chargers and equipment. Powered micromobility devices and powered industrial trucks shall be charged in accordance with their listing and the manufacturer's instructions using only the original equipment manufacturer-supplied charging equipment or charging equipment in accordance with the listing and manufacturer's instructions.

323.3 Listing. Powered micromobility devices shall be listed and labeled in accordance with UL 2272 or UL 2849, as applicable.

323.4 Battery charging areas. Where approved, powered micromobility devices and powered industrial trucks shall be permitted to be charged in a room or area that complies with all of the following:

1. Only listed devices utilizing listed charging equipment shall be permitted to be charged.

2. Is provided with sufficient electrical receptacles to allow the charging equipment for each device to be directly connected to a receptacle. Extension cords and relocatable power taps shall not be used.

3. Storage of combustible materials, combustible waste or hazardous materials shall not be permitted.

4. The charging operation shall not be conducted in or obstruct any required means of egress.

5. Removable storage batteries shall not be stacked or charged in an enclosed cabinet unless the cabinet is specially designed and approved for such purpose.

6. A minimum distance of 18 inches (457.2 mm) shall be maintained between each removable storage battery during charging operations unless each battery is isolated from neighboring batteries by an approved fire-resistant material.

7. A minimum of 18 inches (457.2 mm) shall be maintained between the locations of the batteries on each powered micromobility devices or powered industrial truck during charging operations.

8. The indoor room or area shall be protected by a fire alarm system utilizing air-aspirating smoke detectors or radiant energy-sensing fire detection.

323.5 Fire safety plan. A fire safety plan shall be provided in accordance with Section 403.10.6. In addition, the fire safety plan shall include emergency response actions to be taken upon detection of a fire or possible fire involving lithium-ion or lithium metal battery storage.

History

• Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 22-13-093, 23-12-107, and 23-20-027, § 51-54A-0323, filed 6/14/22, 6/7/23, and 9/25/23, effective 3/15/24.

Wash. Admin. Code § 51-54A-0401 General.

401.2 Approval. Where required by the fire code official, fire safety plans, emergency procedures and employee training programs shall be approved by the fire official.

History

• Statutory Authority: RCW 19.27.035 and 19.27.074. WSR 21-02-059, § 51-54A-0401, filed 1/4/21, effective 2/4/21. Statutory Authority: RCW 19.27A.031, 19.27.074 and chapters 19.27 and 34.05 RCW. WSR 13-04-063, § 51-54A-0401, filed 2/1/13, effective 7/1/13.

Wash. Admin. Code § 51-54A-0402 Definitions.

The following terms are defined in Chapter 2:

ALARM SIGNAL;

ALERT SIGNAL;

ALERT SYSTEM;

EMERGENCY EVACUATION DRILL;

LOCKDOWN;

SHELTER-IN-PLACE;

RECALL SIGNAL.

History

• Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 22-13-093, 23-12-107, and 23-20-027, § 51-54A-0402, filed 6/14/22, 6/7/23, and 9/25/23, effective 3/15/24
• WSR 16-03-055, § 51-54A-0402, filed 1/16/16, effective 7/1/16. Statutory Authority: RCW 19.27A.031, 19.27.074 and chapters 19.27 and 34.05 RCW. WSR 13-04-063, § 51-54A-0402, filed 2/1/13, effective 7/1/13.

Wash. Admin. Code § 51-54A-0403 Emergency preparedness requirements.

403.4.3 Assembly points and fire operations. Assembly points shall not be in areas likely to be utilized for fire service operations.

403.9.2 Group R-2 occupancies. Group R-2 occupancies shall comply with Sections 403.9.2.1 through 403.9.2.4.

403.9.2.4 Group R-2 assisted living and residential care facilities. Assisted living and residential care facilities licensed by the state of Washington shall comply with Section 403.7.1 as required for Group I-1 Condition 2 occupancies.

403.10.6 Buildings with lithium-ion or lithium metal battery storage. An approved fire safety plan in accordance with Section 404 shall be prepared and maintained for buildings with lithium-ion or lithium metal battery storage.

403.11.3 Crowd managers for gatherings exceeding 1,000 people. Where facilities or events involve a gathering of more than 1,000 people, or as required by the fire code official, crowd managers shall be provided in accordance with Sections 403.11.3.1 through 403.11.3.3.

History

• Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 23-23-106, § 51-54A-0403, filed 11/15/23, effective 3/16/24
• WSR 22-13-093, 23-12-107, and 23-20-027, § 51-54A-0403, filed 6/14/22, 6/7/23, and 9/25/23, effective 3/15/24
• WSR 16-03-055, § 51-54A-0403, filed 1/16/16, effective 7/1/16.

Wash. Admin. Code § 51-54A-0404 Fire safety and evacuation plans.

404.2.3 Lockdown plans. This section is not adopted.

History

• Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 16-03-055, § 51-54A-0404, filed 1/16/16, effective 7/1/16. Statutory Authority: RCW 19.27A.031, 19.27.074 and chapters 19.27 and 34.05 RCW. WSR 13-04-063, § 51-54A-0404, filed 2/1/13, effective 7/1/13.

Wash. Admin. Code § 51-54A-0405 Reserved.

History

• Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 20-01-162, § 51-54A-0405, filed 12/18/19, effective 7/1/20. Statutory Authority: Chapter 19.27 RCW and RCW 19.27.031. WSR 17-10-028, § 51-54A-0405, filed 4/25/17, effective 5/26/17. Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 16-03-055, § 51-54A-0405, filed 1/16/16, effective 7/1/16
• WSR 13-20-118, § 51-54A-0405, filed 10/1/13, effective 11/1/13. Statutory Authority: RCW 19.27A.031, 19.27.074 and chapters 19.27 and 34.05 RCW. WSR 13-04-063, § 51-54A-0405, filed 2/1/13, effective 7/1/13.

Wash. Admin. Code § 51-54A-0406 Employee training and response procedures.

406.1 General. Employees in the occupancies listed in Section 403 shall be trained in the emergency procedures described in their emergency plans. Training shall be based on these plans and as described in Sections 406.2 through 406.3.5.

406.2 Frequency. Employees shall receive training in the contents of the emergency plans and their duties as part of new employee orientation and at least annually thereafter. Records shall be kept and made available to the fire code official upon request.

406.3 Employee training program. Employees shall be trained in fire prevention, evacuation, sheltering-in-place, and fire safety in accordance with Sections 406.3.1 through 406.3.5.

406.3.4 Emergency lockdown training. This section is not adopted.

406.3.5 Emergency shelter-in-place training. Where a facility has a shelter-in-place plan, employees shall be trained on the alert and recall signals, communication system, location of emergency supplies, the use of the incident notification and alarm system, and their assigned duties and procedures in the event of an alarm or emergency.

History

• Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 23-23-106, § 51-54A-0406, filed 11/15/23, effective 3/16/24
• WSR 22-13-093, 23-12-107, and 23-20-027, § 51-54A-0406, filed 6/14/22, 6/7/23, and 9/25/23, effective 3/15/24
• WSR 21-04-003, § 51-54A-0406, filed 1/20/21, effective 2/20/21. Statutory Authority: RCW 19.27.035 and 19.27.074. WSR 21-02-059, § 51-54A-0406, filed 1/4/21, effective 2/4/21. Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 20-01-162, § 51-54A-0406, filed 12/18/19, effective 7/1/20
• WSR 16-03-055, § 51-54A-0406, filed 1/16/16, effective 7/1/16. Statutory Authority: RCW 19.27A.031, 19.27.074 and chapters 19.27 and 34.05 RCW. WSR 13-04-063, § 51-54A-0406, filed 2/1/13, effective 7/1/13.

Wash. Admin. Code § 51-54A-0408 Reserved.

History

• Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 16-03-055, § 51-54A-0408, filed 1/16/16, effective 7/1/16. Statutory Authority: RCW 19.27A.031, 19.27.074 and chapters 19.27 and 34.05 RCW. WSR 13-04-063, § 51-54A-0408, filed 2/1/13, effective 7/1/13.

Wash. Admin. Code § 51-54A-0501 Reserved.

History

• Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 23-23-106, § 51-54A-0501, filed 11/15/23, effective 3/16/24
• WSR 22-13-093, 23-12-107, and 23-20-027, § 51-54A-0501, filed 6/14/22, 6/7/23, and 9/25/23, effective 3/15/24.

Wash. Admin. Code § 51-54A-0503 Fire apparatus access roads.

503.1 Where required. Fire apparatus access roads shall be provided and maintained in accordance with locally adopted street, road, and access standards.

503.1.1 Buildings and facilities. This section is not adopted.

503.1.2 Additional access. This section is not adopted.

503.1.3 High-piled storage. This section is not adopted.

503.2 Specifications. This section is not adopted.

503.3 Marking. This section is not adopted.

503.4 Obstruction of fire apparatus access roads. This section is not adopted.

503.4.1 Traffic calming devices. This section is not adopted.

History

• Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 23-23-106, § 51-54A-0503, filed 11/15/23, effective 3/16/24. Statutory Authority: RCW 19.27A.031, 19.27.074 and chapters 19.27 and 34.05 RCW. WSR 13-04-063, § 51-54A-0503, filed 2/1/13, effective 7/1/13.

Wash. Admin. Code § 51-54A-0507 Fire protection water supplies.

507.3 Fire flow. Fire flow requirements for buildings or portions of buildings and facilities shall be determined by an approved method.

| EXCEPTIONS: | 1. Fire flow is not required for structures under 500 square feet (46 m2) with a B, U or R-1 occupancy where structures are at least 30 feet (9144 mm) from any other structure and are used only for recreation. | | --- | --- | | | 2. In rural and suburban areas in which adequate and reliable water supply systems do not exist, the fire code official is authorized to utilize NFPA 1142 or the International Wildland-Urban Interface Code. |

History

• Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 23-23-106, § 51-54A-0507, filed 11/15/23, effective 3/16/24
• WSR 16-03-055, § 51-54A-0507, filed 1/16/16, effective 7/1/16. Statutory Authority: RCW 19.27A.031, 19.27.074 and chapters 19.27 and 34.05 RCW. WSR 13-04-063, § 51-54A-0507, filed 2/1/13, effective 7/1/13.

Wash. Admin. Code § 51-54A-0508 Fire command center.

508.1.2 Separation. The fire command center shall be separated from the remainder of the building by not less than a 2-hour fire barrier constructed in accordance with Section 707 of the International Building Code or horizontal assembly constructed in accordance with Section 711 of the International Building Code, or both.

History

• Statutory Authority: Chapter 19.27 RCW and RCW 19.27.031. WSR 17-10-028, § 51-54A-0508, filed 4/25/17, effective 5/26/17. Statutory Authority: RCW 19.27A.031, 19.27.074 and chapters 19.27 and 34.05 RCW. WSR 13-04-063, § 51-54A-0508, filed 2/1/13, effective 7/1/13.

Wash. Admin. Code § 51-54A-0510 Emergency responder communication coverage.

510.1 Emergency responder communication coverage in new buildings. Approved in-building, emergency responder communications enhancement system (ERCES) for emergency responders shall be provided in all new buildings. In-building ERCES within the building shall be based on the existing coverage levels of the public safety communication systems utilized by the jurisdiction, measured at the exterior of the building. The emergency responder communications enhancement system, where required, shall be of a type determined by the fire code official and the frequency license holder(s). This section shall not require improvement of the existing public safety communication systems.

| EXCEPTIONS: | 1. Where approved by the building official and the fire code official, a wired communication system in accordance with Section 907.2.13.2 shall be permitted to be installed or maintained instead of an approved communication coverage system. | | --- | --- | | | 2. Where it is determined by the fire code official that the communication coverage system is not needed. | | | 3. In facilities where emergency responder communication coverage is required and such systems, components or equipment required could have a negative impact on the normal operations of that facility, the fire code official shall have the authority to accept an automatically activated emergency responder communication coverage system. |

510.2 Emergency responder communication enhancement system in existing buildings. Existing buildings shall be provided

with approved in-building, emergency responder communications enhancement system for emergency responders as required in Chapter 11.

510.3 Permit required. A construction permit for the installation of or modification to in-building, emergency responder communication enhancement systems and related equipment is required as specified in Section 105.6.4. Maintenance performed in accordance with this code is not considered a modification and does not require a permit.

510.4 Technical requirements. Equipment required to provide in-building, emergency responder communication enhancement system shall be listed in accordance with UL 2524. Systems, components and equipment required to provide the in-building, emergency responder communication enhancement system shall comply with Sections 510.4.1 through 510.4.2.8.

510.4.1 Emergency responder communication enhancement system signal strength. The building shall be considered to have an acceptable in-building, emergency responder communication enhancement system where signal strength measurements in 95 percent of all areas and 99 percent of areas designated as critical areas by the fire code official on each floor of the building meet the signal strength requirements in Sections 510.4.1.1 through 510.4.1.3.

510.4.1.1 Minimum signal strength into the building. The minimum inbound signal strength shall be sufficient to provide usable voice communications throughout the coverage area as specified by the fire code official. The inbound signal level shall be a minimum of -95 dBm in 95 percent of the coverage area and 99 percent in critical areas and sufficient to provide not less than a delivered audio quality (DAQ) of 3.0 or an equivalent signal-to-interference-plus-noise ratio (SINR) applicable to the technology for either analog or digital signals.

510.4.2 System design. The in-building, emergency responder communication enhancement system shall be designed in accordance with Sections 510.4.2.1 through 510.4.2.8 and NFPA 1221.

510.4.2.1 Amplification systems and components. Buildings and structures that cannot support the required level of in-building, emergency responder communication enhancement system shall be equipped with systems and components to enhance the radio signals and achieve the required level of in-building, emergency responder communication enhancement system specified in Sections 510.4.1 through 510.4.1.3. In-building, emergency responder communication enhancement systems utilizing radio-frequency-emitting devices and cabling shall be approved by the fire code official. Prior to installation, all RF-emitting devices shall have the certification of the radio licensing authority and be suitable for public safety use.

510.4.2.2 Technical criteria. The fire code official shall maintain a document providing the specific technical information and requirements for the in-building, emergency responder communication enhancement system. This document shall contain, but not be limited to, the various frequencies required, the location of radio sites, the effective radiated power of radio sites, the maximum propagation delay in microseconds, the applications being used and other supporting technical information necessary for system design.

510.4.2.3 Standby power. In-building, emergency responder communication enhancement systems coverage systems shall be provided with dedicated standby batteries or provided with 2-hour standby batteries and connected to the facility generator power system in accordance with Section 1203. The standby power supply shall be capable of operating the in-building, emergency responder communication enhancement system at 100 percent system capacity for a duration of not less than 12 hours.

510.4.2.4 Signal booster requirements. If used, signal boosters shall meet the following requirements:

1. All signal booster components shall be a National Electrical Manufacturer's Association (NEMA) 4, IP66-type waterproof cabinet or equivalent.

| EXCEPTION: | Listed battery systems that are contained in integrated battery cabinets. | | --- | --- |

2. Battery systems used for the emergency power source shall be contained in a NEMA 3R or higher-rated cabinet, IP65-type waterproof cabinet or equivalent.

| EXCEPTION: | Listed battery systems that are contained in integrated battery cabinets. | | --- | --- |

3. Equipment shall have FCC or other radio licensing authority certification and be suitable for public safety use prior to installation.

4. Where a donor antenna exists, isolation shall be maintained between the donor antenna and all inside antennas to not less than 20 dB greater than the system gain under all operating conditions.

5. Bi-directional amplifiers (BDA) used for in-building, emergency responder communication enhancement systems shall be fitted with anti-oscillation detection and control circuitry and per-channel AGC.

6. The installation of amplification systems or enhancement systems that operate on or provide the means to cause interference on any in-building, emergency respondercommunication enhancement system network shall be coordinated and approved by the fire code official.

7. Only channelized signal boosters shall be permitted.

| EXCEPTION: | Broadband BDAs may be utilized when specifically authorized in writing by the frequency license holder. | | --- | --- |

510.4.2.5 System monitoring. The in-building, emergency responder communication enhancement system shall include automatic supervisory and trouble signals that are monitored by a supervisory service and are annunciated by the fire alarm system in accordance with NFPA 72. The following conditions shall be separately annunciated by the fire alarm system, or, if the status of each of the following conditions is individually displayed on a dedicated panel on the in-building, emergency responder communication enhancement system, a single automatic supervisory signal may be annunciated on the fire alarm system indicating deficiencies of the in-building, emergency responder communication enhancement system:

1. Loss of normal AC power supply.

2. System battery charger(s) failure.

3. Malfunction of the donor antenna(s).

4. Failure of active RF-emitting device(s).

5. Low-battery capacity at 70 percent reduction of operating capacity.

6. Active system component malfunction.

7. Malfunction of the communications link between the fire alarm system and the in-building, emergency responder communication enhancement system.

8. Oscillation of active RF-emitting device(s).

510.4.2.6 Additional frequencies and change of frequencies. The in-building, emergency responder communication enhancement system shall be capable of modification or expansion in the event frequency changes are required by the FCC or other radio licensing authority, or additional frequencies are made available by the FCC or other radio licensing authority.

510.4.2.7 Design documents. The fire code official shall have the authority to require "as-built" design documents and specifications for in-building, emergency responder communication enhancement systems. The documents shall be in a format acceptable to the fire code official.

510.4.2.8 Radio communication antenna density. Systems shall be engineered to minimize the near-far effect. In-building, emergency responder communication enhancement system designs shall include sufficient antenna density to address reduced gain conditions.

| EXCEPTION: | Systems where all portable devices within the same band use active power control features. | | --- | --- |

510.5 Installation requirements. The installation of the in-building, emergency responder communication enhancement system shall be in accordance with NFPA 1221 and Sections 510.5.1 through 510.5.7.

510.5.1 Mounting of the donor antenna(s). To maintain proper alignment with the system designed donor site, donor antennas shall be permanently affixed on the highest possible position on the building or where approved by the fire code official. A clearly visible sign stating "MOVEMENT OR REPOSITIONING OF THIS ANTENNA IS PROHIBITED WITHOUT APPROVAL FROM THE FIRE CODE OFFICIAL." shall be posted. The antenna installation shall be in accordance with the applicable requirements in the International Building Code for weather protection of the building envelope.

510.5.3 Minimum qualifications of personnel. The minimum qualifications of the system designer and lead acceptance test personnel shall include both of the following:

1. A valid FCC-issued general radio telephone operators license.

2. Certification of in-building system training issued by an approved organization or approved school, or a certificate issued by the manufacturer of the equipment being installed.

510.5.4 Acceptance test procedure. Where an in-building emergency respondercommunication enhancementsystem is required, and upon completion of installation, the building owner shall have the radio system tested to verify that two-way coverage on each floor of the building is in accordance with Section 510.4.1. The test procedure shall be conducted as follows:

1. Each floor of the building shall be divided into a grid of 20 approximately equal test areas, with a maximum test area size of 6,400 square feet (595 m2). Where the floor area exceeds 128,000 square feet (11,904 m2), the floor shall be divided into as many approximately equal test areas as needed, such that no test area exceeds the maximum square footage allowed for a test area.

2. The test shall be conducted using a calibrated portable radio of the latest brand and model used by the agency talking through the agency's radio communications system or equipment approved by the fire code official.

3. Coverage testing of signal strength shall be conducted using a calibrated spectrum analyzer for each of the test grids. A diagram of this testing shall be created for each floor where coverage is provided, indicating the testing grid used for the test in Section 510.5.4(1), and including signal strengths and frequencies for each test area. Indicate all critical areas.

4. Functional talk-back testing shall be conducted using two calibrated portable radios of the latest brand and model

used by the agency's radio communications system or other equipment approved by the fire code official. Testing shall use digital audible quality (DAQ) metrics, where a passing result is a DAQ of 3 or higher. Communications between handsets shall be tested and recorded in the grid square diagram required by Section 510.5.3(2); each grid square on each floor; between each critical area and a radio outside the building; between each critical area and the fire command center or fire alarm control panel; between each landing in each stairwell and the fire command center or fire alarm panel.

5. Failure of more than 5 percent of the test areas on any floor shall result in failure of the test.

| EXCEPTION: | Critical areas shall be provided with 99 percent floor area coverage. | | --- | --- |

6. In the event that two of the test areas fail the test, in order to be more statistically accurate, the floor shall be permitted to be divided into 40 equal test areas. Failure of not more than two nonadjacent test areas shall not result in failure of the test. If the system fails the 40 area test, the system shall be altered to meet the 95 percent coverage requirement.

7. A test location approximately in the center of each test area shall be selected for the test, with the radio enabled to verify two-way communications to and from the outside of the building through the public agency's radio communications system. Once the test location has been selected, that location shall represent the entire test area. Failure in the selected test location shall be considered to be a failure of that test area. Additional test locations shall not be permitted.

8. The gain values of all amplifiers shall be measured and the test measurement results shall be kept on file with the building owner so that the measurements can be verified during annual tests. In the event that the measurement results become lost, the building owner shall be required to rerun the acceptance test to reestablish the gain values.

9. As part of the installation, a spectrum analyzer or other suitable test equipment shall be utilized to ensure spurious oscillations are not being generated by the subject signal booster. This test shall be conducted at the time of installation and at subsequent annual inspections.

10. Systems shall be tested using two portable radios simultaneously conducting subjective voice quality checks. One portable radio shall be positioned not greater than 10 feet (3048 mm) from the indoor antenna. The second portable radio shall be positioned at a distance that represents the farthest distance from any indoor antenna. With both portable radios simultaneously keyed up on different frequencies within the same band, subjective audio testing shall be conducted and comply with DAQ levels as specified in Sections 510.4.1.1 and 510.4.1.2.

11. Documentation maintained on premises. At the conclusion of the testing, and prior to issuance of the building certificate of occupancy, the building owner or owner's representative shall place a copy of the following records in the Distributed Antenna System enclosure or the building engineer's office. The records shall be available to the fire code official and maintained by the building owner for the life of the system:

a. A certification letter stating that the emergency responder enhancement coverage system has been installed and tested in accordance with this code, and that the system is complete and fully functional.

b. The grid square diagram created as part of testing in Sections 510.5.3(2) and 510.5.3(3).

c. Data sheets and/or manufacturer specifications for the emergency responder enhancement coverage system equipment; back up battery; and charging system (if utilized).

d. A diagram showing device locations and wiring schematic.

e. A copy of the electrical permit.

510.5.5FCC compliance. The in-building, emergency responder communication enhancement system installation and components shall comply with all applicable federal regulations including, but not limited to, FCC 47 C.F.R. Part 90.219.

510.5.6 Wiring. The backbone, antenna distribution, radiating, or any fiber optic cables shall be rated as plenum cables. The backbone cables shall be connected to the antenna distribution, radiating, or copper cables using hybrid coupler devices of a value determined by the overall design. Backbone cables shall be routed through an enclosure that matches the building's required fire-resistance rating for shafts or interior exit stairways. The connection between the backbone cable and the antenna cables shall be made within an enclosure that matches the building's fire-resistance rating for shafts or interior exit stairways, and passage of the antenna distribution cable in and out of the enclosure shall be protected as a penetration per the International Building Code.

510.5.7 Identification signs.Emergency responder enhancement systems shall be identified by an approved sign located on or near the fire alarm control panel or other approved location stating "This building is equipped with an Emergency Responder Enhancement Coverage System. Control Equipment located in ....... or as approved by the Fire Code Official." A sign stating "Emergency Responder Enhancement Coverage System Equipment" shall be placed on or adjacent to the door of the room containing the main system components.

510.6 Maintenance. The in-building, emergency responder communication enhancement system shall be maintained operational at all times in accordance with Sections 510.6.1 through 510.6.4.

510.6.1 Testing and proof of compliance. The owner of the building or owner's authorized agent shall have the in-building, emergency responder communication enhancement system inspected and tested annually or where structural changes occur including additions or remodels that could materially change the original field performance tests. Testing shall consist of the following items 1 through 7:

1. In-building coverage test as required by the fire code official as described in Section 510.5.4 or 510.6.1.1.

| EXCEPTION: | Group R Occupancy annual testing is not required within dwelling units. | | --- | --- |

2. Signal boosters shall be tested to verify that the gain/output level is the same as it was upon initial installation and acceptance or set to optimize the performance of the system.

3. Backup batteries and power supplies shall be tested under load of a period of 1 hour to verify that they will properly operate during an actual power outage. If within the 1-hour test period the battery exhibits symptoms of failure, the test shall be extended for additional 1-hour periods until the integrity of the battery can be determined.

4. All other active components shall be checked to verify operation within the manufacturers specification.

5. If a fire alarm system is present in the building, a test shall be conducted to verify that the fire alarm system is properly supervising the emergency responder communication enhancement system as required in Section 510.4.2.5. The test is performed by simulating alarms to the fire alarm control panel. The certifications in Section 510.5.2 are sufficient for the personnel performing this testing.

6. At the conclusion of testing, a record of the inspection and maintenance along with an updated grid diagram of each floor showing tested strengths in each grid square and each critical area shall be added to the documentation maintained on the premises in accordance with Section 510.5.3.

7. At the conclusion of the testing, a report, which shall verify compliance with Section 510.6.1, shall be submitted to the fire code official.

510.6.1.1 Alternative in-building coverage test. When the comprehensive test documentation required by Section 510.5.3 is available, or the most recent full five-year test results are available if the system is older than six years, the in-building coverage test required by the fire code official in Section 510.6.1(1), may be conducted as follows:

1. Functional talk-back testing shall be conducted using two calibrated portable radios of the latest brand and model used by the agency's radio communications system or other equipment approved by the fire code official. Testing shall use digital audible quality (DAQ) metrics, where a passing result is a DAQ of 3 or higher. Communications between handsets in the following locations shall be tested: Between the fire command center or fire alarm control panel and a location outside the building and between the fire alarm control panel and each landing in each stairwell.

2. Coverage testing of signal strength shall be conducted using a calibrated spectrum analyzer for:

a. Three grid areas per floor. The three grid areas to be tested on each floor are the three grid areas with poorest performance in the acceptance test or the most recent annual test, whichever is more recent;

b. Each of the critical areas identified in acceptance test documentation required by Section 510.5.3, or as modified by the fire code official; and

c. One grid square per serving antenna.

3. The test area boundaries shall not deviate from the areas established at the time of the acceptance test, or as modified by the fire code official. The building shall be considered to have acceptable emergency responder communication coverage when the required signal strength requirements in Sections 510.4.1.1 and 510.4.1.2 are located in 95 percent of all areas on each floor of the building and 99 percent in critical areas, and any nonfunctional serving antenna are repaired to function within normal ranges. If the documentation of the acceptance test or most recent previous annual test results are not available or acceptable to the fire code official, the radio coverage verification testing described in Section 510.5.3 shall be conducted.

510.6.2 Additional frequencies. The building owner shall modify or expand the in-building, emergency responder communication enhancement system at their expense in the event frequency changes are required by the FCC or other radio licensing authority, or additional frequencies are made available by the FCC or other radio licensing authority. Prior approval of an in-building, emergency responder communication enhancement system on previous frequencies does not exempt this section.

510.6.3 Nonpublic safety system. Where other nonpublic safety amplification systems installed in buildings reduce the performance or cause interference with the in-building, emergency responder communication enhancement system, the nonpublic safety amplification system shall be corrected or removed.

510.6.4 Field testing.Agency personnel shall have the right to enter onto the property at any reasonable time to conduct field testing to verify the required level of radio coverage or to disable a system adversely impacting the emergency responder communication enhancement system in the region.

History

• Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 23-23-106, § 51-54A-0510, filed 11/15/23, effective 3/16/24
• WSR 22-13-093, 23-12-107, and 23-20-027, § 51-54A-0510, filed 6/14/22, 6/7/23, and 9/25/23, effective 3/15/24
• WSR 21-04-003, § 51-54A-0510, filed 1/20/21, effective 2/20/21
• WSR 19-24-058, § 51-54A-0510, filed 11/27/19, effective 7/1/20.

Wash. Admin. Code § 51-54A-0605 Fuel fired appliances.

605.4.1.1 Approval. Outdoor fuel oil storage tanks shall be in accordance with UL 142, UL 142A, or UL 2085.

605.4.2.1 Approval. Indoor fuel oil storage tanks shall be in accordance with UL 80, UL 142, UL 142A, or UL 2085.

605.4.2.2 Quantity limits. One or more fuel oil storage tanks containing Class II or III combustible liquid shall be permitted in a building. The aggregate capacity of all tanks shall not exceed the following:

1. 660 gallons (2,498 L) in unsprinklered buildings, where stored in a tank complying with UL 80, UL 142, UL 142A, or UL 2085.

2. 1,320 gallons (4,996 L) in buildings equipped with an automatic sprinkler system in accordance with Section 903.3.1.1, where stored in a tank complying with UL 142 or UL 142A. The tank shall be listed as a secondary containment tank, and the secondary containment shall be monitored visually or automatically.

3. 3,000 gallons (11,356 L) in buildings equipped with an automatic sprinkler system in accordance with Section 903.3.1.1, where stored in protected above-ground tanks complying with UL 2085 and Section 5704.2.9.7. The tank shall be listed as a secondary containment tank, as required by UL 2085, and the secondary containment shall be monitored visually or automatically.

History

• Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 22-13-093, 23-12-107, and 23-20-027, § 51-54A-0605, filed 6/14/22, 6/7/23, and 9/25/23, effective 3/15/24
• WSR 20-01-162, § 51-54A-0605, filed 12/18/19, effective 7/1/20. Statutory Authority: RCW 19.27.031, 19.27.074 and chapters 19.27 and 34.05 RCW. WSR 17-18-060, § 51-54A-0605, filed 9/1/17, effective 10/2/17. Statutory Authority: Chapter 19.27 RCW and RCW 19.27.031. WSR 17-10-028, § 51-54A-0605, filed 4/25/17, effective 5/26/17. Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 16-03-055, § 51-54A-0605, filed 1/16/16, effective 7/1/16. Statutory Authority: Chapters 19.27A and 34.05 RCW. WSR 13-24-076, § 51-54A-0605, filed 12/2/13, effective 4/1/14. Statutory Authority: RCW 19.27A.031, 19.27.074 and chapters 19.27 and 34.05 RCW. WSR 13-04-063, § 51-54A-0605, filed 2/1/13, effective 7/1/13.

Wash. Admin. Code § 51-54A-0606 Section 606—Commercial cooking equipment and systems.

606.2 Where required. A Type I hood shall be installed at or above all commercial cooking appliances and domestic cooking appliances used for commercial purposes that produce grease laden vapors.

| EXCEPTIONS: | 1. Factory-built commercial exhaust hoods that are listed and labeled in accordance with UL 710, and installed in accordance with Section 304.1 of the International Mechanical Code, shall not be required to comply with Sections 507.1.5, 507.2.3, 507.2.5, 507.2.8, 507.3.1, 507.3.3, 507.4, and 507.5 of the International Mechanical Code. | | --- | --- | | | 2. Factory-built commercial cooking recirculating systems that are listed and labeled in accordance with UL 710B, and installed in accordance with Section 304.1 of the International Mechanical Code, shall not be required to comply with Sections 507.1.5, 507.2.3, 507.2.5, 507.2.8, 507.3.1, 507.3.3, 507.4, and 507.5 of the International Mechanical Code. Spaces in which such systems are located shall be considered to be kitchens and shall be ventilated in accordance with Table 403.3.1.1 of the International Mechanical Code. For the purpose of determining the floor area required to be ventilated, each individual appliance shall be considered as occupying not less than 100 square feet (9.3 m2). | | | 3. Where cooking appliances are equipped with integral down-draft exhaust systems and such appliances and exhaust systems are listed and labeled for the application in accordance with NFPA 96, a hood shall not be required at or above them. | | | 4. A Type I hood shall not be required for an electric cooking appliance where an approved testing agency provides documentation that the appliance effluent contains 5 mg/m3 or less of grease when tested at an exhaust flow rate of 500 cfm (0.236 m3/s) in accordance with UL 710B. | | | 5. A Type I hood shall not be required to be installed in an R-2 occupancy with not more than 16 residents. |

606.2.1 Domestic cooking appliances used for commercial purposes. Domestic cooking appliances utilized for commercial purposes shall be provided with Type I, Type II, or residential hoods as required for the type of appliances and processes in accordance with Table 606.2.1 and Sections 507.2 and 507.3 of the International Mechanical Code.

Table 606.2.1

Type of Hood Required for Domestic Cooking Appliances in the Following Spacesa,b

| Type of Space | Type of Cooking | Type of Hood | | --- | --- | --- | | Church | 1. Boiling, steaming, and warming precooked food | Residential hoodcor Type II hood | | | 2. Roasting, pan frying, and deep frying | Type I hood | | Community or party room in apartment and condominium | 1. Boiling, steaming, and warming precooked food | Residential hoodcor Type II hoodd | | | 2. Roasting, pan frying, and deep frying | Type I hood | | Day care | 1. Boiling, steaming, and warming precooked food | Residential hoodcor Type II hoodd | | | 2. Roasting, pan frying, and deep frying | Type I hood | | Dormitory, assisted living facility, nursing home | 1. Boiling, steaming, and warming precooked food | Residential hoodcor Type II hood | | | 2. Roasting, pan frying, and deep frying | Type I hood | | Office lunch room | 1. Boiling, steaming, and warming precooked food | Residential hoodcor Type II hoodd | | | 2. Roasting, pan frying, and deep frying | Type I hood |

| a | Commercial cooking appliances shall comply with Section 507.2 of the International Mechanical Code. | | --- | --- | | b | Requirements in this table apply to electric or gas fuel appliances only. Solid fuel appliances or charbroilers require Type I hoods. | | c | Residential hood shall ventilate to the outside. | | d | Type II hood required when more than one appliance is used. |

606.3 Operations, inspection, and maintenance. Commercial cooking systems shall be operated, inspected, and maintained in accordance with Sections 606.3.1 through 606.3.4 and Chapter 12 of NFPA 96.

History

• Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 22-13-093, 23-12-107, and 23-20-027, § 51-54A-0606, filed 6/14/22, 6/7/23, and 9/25/23, effective 3/15/24.

Wash. Admin. Code § 51-54A-0607 Reserved.

History

• Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 22-13-093, 23-12-107, and 23-20-027, § 51-54A-0607, filed 6/14/22, 6/7/23, and 9/25/23, effective 3/15/24
• WSR 21-04-003, § 51-54A-0607, filed 1/20/21, effective 2/20/21
• WSR 20-01-162, § 51-54A-0607, filed 12/18/19, effective 7/1/20.

Wash. Admin. Code § 51-54A-0609 Reserved.

History

• Statutory Authority: RCW 19.27.035 and 19.27.074. WSR 21-02-059, § 51-54A-0609, filed 1/4/21, effective 2/4/21. Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 19-24-058, § 51-54A-0609, filed 11/27/19, effective 7/1/20
• WSR 16-03-055, § 51-54A-0609, filed 1/16/16, effective 7/1/16. Statutory Authority: RCW 19.27A.031, 19.27.074 and chapters 19.27 and 34.05 RCW. WSR 13-04-063, § 51-54A-0609, filed 2/1/13, effective 7/1/13.

Wash. Admin. Code § 51-54A-0701 Reserved.

History

• Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 22-13-093, 23-12-107, and 23-20-027, § 51-54A-0701, filed 6/14/22, 6/7/23, and 9/25/23, effective 3/15/24
• WSR 20-01-162, § 51-54A-0701, filed 12/18/19, effective 7/1/20. Statutory Authority: RCW 19.27.031, 19.27.074 and chapter 19.27 RCW. WSR 19-02-086, § 51-54A-0701, filed 1/2/19, effective 7/1/19.

Wash. Admin. Code § 51-54A-0806 Decorative vegetation in new and existing buildings.

806.1.1 Restricted occupancies. Natural cut trees shall be prohibited in the following occupancies:

1. Group I; and

2. R-2 occupancies providing licensed care to clients in one of the categories listed in the International Building Code, Section 310.1, licensed by Washington state.

806.1.2 Support devices. The support device that holds the tree in an upright position shall be of a type that is stable and that meets all of the following criteria:

1. The device shall hold the tree securely and be of adequate size to avoid tipping over of the tree.

2. The device shall be capable of containing a minimum supply of water in accordance with Table 806.1.2.

3. The water level, when full, shall cover the tree stem at least 2 inches (51 mm). The water level shall be maintained above the fresh cut and checked at least once daily.

Table 806.1.2

Support Stand Water Capacity

| Tree Stem Diameter (inches) | Minimum Support Stand Water Capacity (gallons) | Typical Daily Water Transpiration Amount (gallons) | | --- | --- | --- | | Up to 4 | 1 | 1/4 to 1 | | 4 to 6 | 1 1/2 | 1 1/4 to 1 1/2 | | 7 to 8 | 2 | 1 3/4 to 2 | | 9 to 12 | 3 | 2 1/4 to 3 | | 13 and over | 4 | Over 3 |

History

• Statutory Authority: RCW 19.27A.031, 19.27.074 and chapters 19.27 and 34.05 RCW. WSR 13-04-063, § 51-54A-0806, filed 2/1/13, effective 7/1/13.

Wash. Admin. Code § 51-54A-0901 General.

901.4.2 Nonrequired fire protection systems and life safety systems. A fire protection and life safety system or portion thereof not required by this code or the International Building Code shall be allowed to be furnished for partial or complete protection provided such installed system meets the applicable requirements of this code and the International Building Code. Such systems or portion of system shall be provided with signage stating "NON-REQUIRED SYSTEM." Signage shall be durable and permanent in nature, with contrasting color and background, and with lettering of not less than 1 inch (25 mm) in height. Location of such signage shall be approved.

901.8.2 Removal of existing occupant-use hose lines. The fire code official is authorized to permit the removal of existing occupant-use hose lines where all of the following conditions exist:

1. Installation is not required by this code, the International Building Code, or a previously approved alternative method.

2. The hose line would not be utilized by trained personnel or the fire department.

3. The remaining outlets are compatible with local fire department fittings.

History

• Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 23-23-106, § 51-54A-0901, filed 11/15/23, effective 3/16/24
• WSR 22-13-093, 23-12-107, and 23-20-027, § 51-54A-0901, filed 6/14/22, 6/7/23, and 9/25/23, effective 3/15/24
• WSR 16-03-055, § 51-54A-0901, filed 1/16/16, effective 7/1/16.

Wash. Admin. Code § 51-54A-0903 Automatic sprinkler systems.

903.2 Where required. Approved automatic sprinkler systems in new buildings and structures shall be provided in the locations described in Sections 903.2.1 through 903.2.12.

| EXCEPTIONS: | 1. Spaces or areas in telecommunications buildings used exclusively for telecommunications equipment, associated electrical power distribution equipment, batteries and standby engines, provided that those spaces or areas are equipped throughout with an automatic smoke detection system in accordance with Section 907.2 and are separated from the remainder of the building by not less than 1-hour fire barriers constructed in accordance with Section 707 of the International Building Code or not less than 2-hour horizontal assemblies constructed in accordance with Section 711 of the International Building Code, or both. 2. Bottom of the elevator hoistway in an enclosed and noncombustible elevator shaft. | | --- | --- |

903.2.1.3 Group A-3. An automatic sprinkler system shall be provided throughout stories containing Group A-3 occupancies and throughout all stories from the Group A-3 occupancy to and including the levels of exit discharge serving that occupancy where one of the following conditions exists:

1. The fire area exceeds 12,000 square feet (1115 m2).

2. The fire area has an occupant load of 300 or more.

3. The fire area is located on a floor other than a level of exit discharge serving such occupancies.

| EXCEPTION: | For fixed guideway transit and passenger rail system stations, an automatic sprinkler system shall be provided in accordance with Section 4901. | | --- | --- |

903.2.1.6 Assembly occupancies on roofs. Where an occupied roof has an assembly occupancy with an occupant load exceeding 100 for Group A-2, and 300 for other Group A occupancies, the building shall be equipped with an automatic sprinkler system in accordance with Section 903.3.1.1 or 903.3.1.2.

| EXCEPTION: | Open parking garages of Type I or Type II construction. | | --- | --- |

903.2.1.8 Nightclub. An automatic sprinkler system shall be provided throughout Group A-2 nightclubs as defined in this code.

903.2.3 Group E. An automatic sprinkler system shall be provided for fire areas containing Group E occupancies where the fire area has an occupant load of 51 or more, calculated in accordance with Table 1004.5.

| EXCEPTIONS: | 1. Portable school classrooms with an occupant load of 50 or less calculated in accordance with Table 1004.5, provided that the aggregate area of any cluster of portable classrooms does not exceed 6,000 square feet (557 m2); and clusters of portable school classrooms shall be separated as required by the building code; or | | --- | --- | | | 2. Portable school classrooms with an occupant load from 51 through 98, calculated in accordance with Table 1004.5, and provided with two means of direct independent exterior egress from each classroom in accordance with Chapter 10, and one exit from each class room shall be accessible, provided that the aggregate area of any cluster of portable classrooms does not exceed 6,000 square feet (557 m2); and clusters of portable school classrooms shall be separated as required by the building code; or | | | 3. Fire areas containing day care and preschool facilities with a total occupant load of 100 or less located at the level of exit discharge where every room in which care is provided has not fewer than one exit discharge door. |

903.2.6 Group I. An automatic sprinkler system shall be provided throughout buildings with a Group I fire area.

| EXCEPTIONS: | 1. An automatic sprinkler system installed in accordance with Section 903.3.1.2 shall be permitted in Group I-1 Condition 1 facilities. | | --- | --- | | | 2. Where new construction or additions house less than 16 persons receiving care, an automatic sprinkler system installed in accordance with Section 903.2.8.3 shall be permitted for Group I-1, Condition 2, assisted living facilities licensed under chapter 388-78A WAC and residential treatment facilities licensed under chapter 246-337 WAC. | | | 3. An automatic sprinkler system installed in accordance with Section 903.3.1.2 shall be permitted in additions to existing buildings where both of the following situations are true: | | | 3.1. The addition is made to a building previously approved as Group LC or Group R-2 that houses either an assisted living facility licensed under chapter 388-78A WAC or residential treatment facility licensed under chapter 246-337 WAC. | | | 3.2. The addition contains spaces for 16 or fewer persons receiving care. |

903.2.6.1 Group I-4. An automatic sprinkler system shall be provided in fire areas containing Group I-4 occupancies where the fire area has an occupant load of 51 or more, calculated in accordance with Table 1004.5.

| EXCEPTIONS: | 1. An automatic sprinkler system is not required where Group I-4 day care facilities with a total occupant load of 100 or less, and located at the level of exit discharge and where every room where care is provided has not fewer than one exterior exit door. | | --- | --- | | | 2. In buildings where Group I-4 day care is provided on levels other than the level of exit discharge, an automatic sprinkler system in accordance with Section 903.3.1.1 shall be installed on the entire floor where care is provided, all floors between the level of care and the level of exit discharge and all floors below the level of exit discharge other than areas classified as an open parking garage. |

903.2.8 Group R. An automatic sprinkler system installed in accordance with Section 903.3 shall be provided throughout all buildings with a Group R fire area.

| EXCEPTION: | Group R-1 if all of the following conditions apply: | | --- | --- | | | 1. The Group R fire area is no more than 500 square feet (46 m2) and is used for recreational use only. | | | 2. The Group R fire area is on only one story. | | | 3. The Group R fire area does not include a basement. | | | 4. The Group R fire area is no closer than 30 feet (9144 mm) from another structure. | | | 5. Cooking is not allowed within the Group R fire area. | | | 6. The Group R fire area has an occupant load of no more than eight. | | | 7. A hand-held (portable) fire extinguisher is in every Group R fire area. |

903.2.8.5 Adult family home. An adult family home with a capacity of seven or eight that serves residents who require assistance during an evacuation must install an automatic sprinkler system that meets the requirements of NFPA 13D.

903.2.11.1.3 Basements. Where any portion of a basement is located more than 75 feet (22,860 mm) from openings required by Section 903.2.11.1, or where new walls, partitions or other similar obstructions are installed that increase the exit access travel distance to more than 75 feet (22,860 mm), the basement shall be equipped throughout with an approved automatic sprinkler system.

903.2.11.5 Commercial cooking operations. An automatic sprinkler system shall be installed in commercial kitchen exhaust hood and duct systems where an automatic sprinkler system is used to comply with Section 904.

| EXCEPTION: | An automatic fire sprinkler system is not required to protect the ductwork that is in excess of 75 feet (22,860 mm) when the commercial kitchen exhaust hood is protected by a system listed per UL 300. | | --- | --- |

Table 903.2.11.6

Additional Required Fire Protection Systems

| Note: | Add section and subject to existing model code table. | | --- | --- |

| Section | Subject | | --- | --- | | 322.4.2.3 | Lithium-ion and lithium metal battery storage |

903.2.11.7 Relocatable buildings within buildings. Relocatable buildings or structures located within a building with an approved fire sprinkler system shall be provided with fire sprinkler protection within the occupiable space of the building and the space underneath the relocatable building.

| EXCEPTIONS: | 1. Sprinkler protection is not required underneath the building when the space is separated from the adjacent space by construction resisting the passage of smoke and heat and combustible storage will not be located there. | | --- | --- | | | 2. If the building or structure does not have a roof or ceiling obstructing the overhead sprinklers. | | | 3. Construction trailers and temporary offices used during new building construction prior to occupancy. | | | 4. Movable shopping mall kiosks with a roof or canopy dimension of less than 4 feet (1219 mm) on the smallest side. |

903.3.1.2 NFPA 13R sprinkler systems.Automatic sprinkler systems in Group R occupancies up to and including four stories in height in buildings not exceeding 60 feet (18,288 mm) in height above grade plane shall be permitted to be installed throughout in accordance with NFPA 13R. The number of stories of Group R occupancies constructed in accordance with Sections 510.2 and 510.4 of the International Building Code shall be measured from the horizontal assembly creating separate buildings.

903.3.5.3 Underground portions of fire protection system water supply piping. The portion of the installation or modification of an underground water main, public or private, dedicated to supplying a water-based fire protection system shall be in accordance with NFPA 24 and chapter 18.160 RCW. Piping and appurtenances downstream of the first control valve on the lateral or service line from the distribution main to 1 foot (305 mm) above finished floor shall be approved by the fire code official. Such underground piping shall be installed by a fire sprinkler system contractor licensed in accordance with chapter 18.160 RCW and holding either a Level U or a Level 3 license. For underground piping supplying systems installed in accordance with Section 903.3.1.2, a Level 2, 3, or U licensed contractor is acceptable.

| EXCEPTIONS: | 1. Portions of underground piping supplying automatic sprinkler systems installed in accordance with Section 903.3.1.3. | | --- | --- | | | 2. Portions of underground water mains serving sprinkler systems that are designed and installed in accordance with Section 903.3.1.2 and are less than 4 inches (100 mm) in nominal diameter. |

History

• Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 23-23-106, § 51-54A-0903, filed 11/15/23, effective 3/16/24
• WSR 22-13-093, 23-12-107, and 23-20-027, § 51-54A-0903, filed 6/14/22, 6/7/23, and 9/25/23, effective 3/15/24
• WSR 21-04-003, § 51-54A-0903, filed 1/20/21, effective 2/20/21
• WSR 19-24-058, § 51-54A-0903, filed 11/27/19, effective 7/1/20. Statutory Authority: Chapter 19.27 RCW and RCW 19.27.031. WSR 17-10-028, § 51-54A-0903, filed 4/25/17, effective 5/26/17. Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 16-03-055, § 51-54A-0903, filed 1/16/16, effective 7/1/16. Statutory Authority: RCW 19.27.074, 19.27.020, and 19.27.031. WSR 14-24-090, § 51-54A-0903, filed 12/1/14, effective 5/1/15. Statutory Authority: RCW 19.27A.031, 19.27.074 and chapters 19.27 and 34.05 RCW. WSR 13-04-063, § 51-54A-0903, filed 2/1/13, effective 7/1/13.

Wash. Admin. Code § 51-54A-0904 Alternative automatic fire-extinguishing systems.

904.1.1 Certification of service personnel for fire-extinguishing equipment. Service personnel performing system design, installation, or conducting system maintenance or testing on automatic fire-extinguishing systems, other than automatic sprinkler systems, shall possess the appropriate ICC/NAFED certification.

904.1.1.1 Preengineered kitchen fire-extinguishing systems. A current ICC/NAFED certification for preengineered kitchen fire-extinguishing systems is required when performing design, installation, inspection/testing or maintenance on kitchen suppression systems.

904.1.1.2 Engineered fire suppression systems. A current ICC/NAFED certification for engineered fire suppression systems is required when performing design, installation, inspection/testing or maintenance on kitchen suppression systems.

904.1.1.3 Preengineered industrial fire-extinguishing system. A current ICC/NAFED certification for preengineered industrial fire-extinguishing system is required when performing design, installation, inspection/testing or maintenance on kitchen suppression systems.

904.1.1 (Effective July 1, 2024) Certification of personnel for alternative fire-extinguishing equipment. Personnel performing system design, installation, maintenance, programming or testing on automatic fire-extinguishing systems, other than automatic sprinkler systems, shall possess the appropriate National Institute for Certification in Engineering Technologies (NICET) Special Hazards Suppression Systems certification.

| EXCEPTION: | A current ICC/NAFED certification for preengineered kitchen fire extinguishing system technician is allowed in lieu of NICET Level II or higher in Special Hazards Suppression Systems for the design, installation, inspection/testing or maintenance on preengineered kitchen suppression systems. | | --- | --- |

904.1.1.1 (Effective July 1, 2024)Design. All construction documents shall be reviewed by a NICET Level III in special hazard suppression systems or a licensed professional engineer (PE) in the state of Washington prior to being submitted for permitting. The reviewing professional shall submit a stamped, signed, and dated letter; or a verification method approved by the fire code official indicating the system has been reviewed and meets or exceeds the design requirements of the state of Washington and the local jurisdiction.

904.1.1.2 (Effective July 1, 2024) Installation. Installation not defined as "electrical construction trade" by chapter 19.28 RCW or "Fire Protection Sprinkler Fitting" by chapter 18.270 RCW, shall be completed by or directly supervised by a NICET Level II or higher in special hazards suppression systems. Supervision shall consist of a person being on the same job site and under the control of a NICET Level II or higher in special hazards suppression systems.

904.1.1.3 (Effective July 1, 2024) Testing/maintenance. Inspection, testing, commissioning, maintenance, and programming not defined as "electrical construction trade" by chapter 19.28 RCW or "Fire Protection Sprinkler Fitting" by chapter 18.270 RCW, shall be completed by a NICET Level II or higher in special hazards suppression systems.

904.13 Commercial cooking systems. The automatic fire-extinguishing system for commercial cooking systems shall be of a type recognized for protection of commercial cooking equipment and exhaust systems of the type and arrangement protected. Preengineered automatic dry- and wet-chemical extinguishing systems shall be tested in accordance with UL 300 and listed and labeled for the intended application. Other types of automatic fire-extinguishing systems shall be listed and labeled for specific use as protection for commercial cooking operations. The system shall be installed in accordance with this code, NFPA 96, its listing and the manufacturer's installation instructions. Additional protection is not required for ductwork beyond 75 feet (22,860 mm) when hood suppression system complies with UL 300. Signage shall be provided on the exhaust hood or system cabinet, indicating the type and arrangement of cooking appliances protected by the automatic fire-extinguishing system. Signage shall indicate appliances from left to right, be durable, and the size, color, and lettering shall be approved. Automatic fire-extinguishing systems of the following types shall be installed in accordance with the referenced standard indicated, as follows:

1. Carbon dioxide extinguishing systems, NFPA 12.

2. Automatic sprinkler systems, NFPA 13.

3. Automatic water mist systems, NFPA 750.

4. Foam-water sprinkler system or foam-water spray systems, NFPA 16.

5. Dry-chemical extinguishing systems, NFPA 17.

6. Wet-chemical extinguishing systems, NFPA 17A.

| EXCEPTIONS: | 1. Factory-built commercial cooking recirculating systems that are tested in accordance with UL 710B and listed, labeled and installed in accordance with Section 304.1 of the International Mechanical Code. | | --- | --- | | | 2. Protection of duct systems beyond 75 feet (22,860 mm) when the commercial kitchen exhaust hood is protected by a system listed in accordance with UL 300. |

History

• Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 23-23-106, § 51-54A-0904, filed 11/15/23, effective 3/16/24
• WSR 22-13-093, 23-12-107, and 23-20-027, § 51-54A-0904, filed 6/14/22, 6/7/23, and 9/25/23, effective 3/15/24
• WSR 19-24-058, § 51-54A-0904, filed 11/27/19, effective 7/1/20
• WSR 16-03-055, § 51-54A-0904, filed 1/16/16, effective 7/1/16.

Wash. Admin. Code § 51-54A-0907 Fire alarm and detection systems.

907.2.3 Group E. Group E occupancies shall be provided with a manual fire alarm system that initiates the occupant notification signal utilizing one of the following:

1. An emergency voice/alarm communication system meeting the requirements of Section 907.5.2.2 and installed in accordance with Section 907.6; or

2. A system developed as part of a safe school plan adopted in accordance with RCW 28A.320.125 or developed as part of an emergency response system consistent with the provisions of RCW 28A.320.126. The system must achieve all of the following performance standards:

2.1 The ability to broadcast voice messages or customized announcements;

2.2 Includes a feature for multiple sounds, including sounds to initiate a lock down;

2.3 The ability to deliver messages to the interior of a building, areas outside of a building as designated pursuant to the safe school plan, and to personnel;

2.4 The ability for two-way communications;

2.5 The ability for individual room calling;

2.6 The ability for a manual override;

2.7 Installation in accordance with NFPA 72;

2.8 Provide 15 minutes of battery backup for alarm and 24 hours of battery backup for standby; and

2.9 Includes a program for annual inspection and maintenance in accordance with NFPA 72.

| EXCEPTIONS: | 1. A manual fire alarm system is not required in Group E occupancies with an occupant load of 50 or less. | | --- | --- | | | 2. Emergency voice/alarm communication systems meeting the requirements of Section 907.5.2.2 and installed in accordance with Section 907.6 shall not be required in Group E occupancies with occupant loads of 100 or less, such as individual portable school classroom buildings; provided that activation of the manual fire alarm system initiates an approved occupant notification signal in accordance with Section 907.5. | | | 3. Where an existing approved alarm system is in place, an emergency voice/alarm system is not required in any portion of an existing Group E building undergoing any one of the following repairs, alteration or addition: | | | 3.1 Alteration or repair to an existing building including, without limitation, alterations to rooms and systems, and/or corridor configurations, not exceeding 35 percent of the fire area of the building (or the fire area undergoing the alteration or repair if the building is comprised of two or more fire areas); or | | | 3.2 An addition to an existing building, not exceeding 35 percent of the fire area of the building (or the fire area to which the addition is made if the building is comprised of two or more fire areas). | | | 4. Manual fire alarm boxes are not required in Group E occupancies where all of the following apply: | | | 4.1 Interior corridors are protected by smoke detectors. | | | 4.2 Auditoriums, cafeterias, gymnasiums and similar areas are protected by heat detectors or other approved detection devices. | | | 4.3 Shops and laboratories involving dusts or vapors are protected by heat detectors or other approved detection devices. | | | 5. Manual fire alarm boxes shall not be required in Group E occupancies where all of the following apply: | | | 5.1 The building is equipped throughout with an approved automatic sprinkler system installed in accordance with Section 903.3.1.1. | | | 5.2 The emergency voice/alarm communication system will activate on sprinkler waterflow. | | | 5.3 Manual activation is provided from a normally occupied location. |

907.2.3.1 Sprinkler systems or detection. When automatic sprinkler systems or smoke detectors are installed, such systems or detectors shall be connected to the building fire alarm system.

907.2.6.1 Group I-1. An automatic smoke detection system shall be installed in corridors, waiting areas open to corridors and habitable spaces other than sleeping units and kitchens. The system shall be activated in accordance with Section 907.4.

| EXCEPTIONS: | 1. For Group I-1 Condition 1 occupancies, smoke detection in habitable spaces is not required where the facility is equipped throughout with an automatic sprinkler system installed in accordance with Section 903.3.1.1. | | --- | --- | | | 2. Smoke detection is not required for exterior balconies. |

907.2.6.4 Group I-4 occupancies. A manual fire alarm system that initiates the occupant notification signal utilizing an emergency voice/alarm communication system meeting the requirements of Section 907.5.2.2 and installed in accordance with Section 907.6 shall be installed in Group I-4 occupancies. When automatic sprinkler systems or smoke detectors are installed, such systems or detectors shall be connected to the building fire alarm system.

| EXCEPTIONS: | 1. A manual fire alarm system is not required in Group I-4 occupancies with an occupant load of 50 or less. | | --- | --- | | | 2. Emergency voice alarm communication systems meeting the requirements of Section 907.5.2.2 and installed in accordance with Section 907.6 shall not be required in Group I-4 occupancies with occupant loads of 100 or less, provided that activation of the manual fire alarm system initiates an approved occupant notification signal in accordance with Section 907.5. |

907.2.11.1 Group R-1. Single or multiple-station smoke alarms shall be installed in all of the following locations in Group R-1:

1. In sleeping areas.

2. In each loft constructed in accordance with Section 420.13 of the International Building Code.

3. In every room in the path of the means of egress from the sleeping area to the door leading from the sleeping unit.

4. In each story within the sleeping unit, including basements. For sleeping units with split levels and without an intervening door between the adjacent levels, a smoke alarm installed on the upper level shall suffice for the adjacent lower level provided that the lower level is less than one full story below the upper level.

907.2.11.2 Groups R-2, R-3, R-4, and I-1. Single- or multiple-station smoke alarms shall be installed and maintained in Groups R-2, R-3, R-4, and I-1 regardless of occupant load at all of the following locations:

1. On the ceiling or wall outside of each separate sleeping area in the immediate vicinity of bedrooms.

2. In each room used for sleeping purposes.

3. In each loft constructed in accordance with Section 420.13 of the International Building Code.

4. In each story within a dwelling unit, including basements but not including crawl spaces and uninhabitable attics. In dwellings or dwelling units with split levels and without an intervening door between the adjacent levels, a smoke alarm installed on the upper level shall suffice for the adjacent lower level provided that the lower level is less than one full story below the upper level.

907.5.2.1.2 Maximum sound pressure. The maximum sound pressure level for audible alarm notification appliances shall be 110 dBA at the minimum hearing distance from the audible appliance. For systems operating in public mode, the maximum sound pressure level shall not exceed 30 dBA over the average ambient sound level. Where the average ambient noise is greater than 95 dBA, visible alarm notification appliances shall be provided in accordance with NFPA 72 and audible alarm notification appliances shall not be required.

907.8.4.1 Testing/maintenance: All inspection, testing, maintenance and programing not defined as "electrical construction trade" by chapter 19.28 RCW shall be completed by a NICET II or ESA/NTS Certified Fire Alarm Technician (CFAT) Level II Fire in fire alarms (effective July 1, 2018).

907.11 NICET: National Institute for Certification in Engineering Technologies and ESA/NTS: Electronic Security Association/National Training School.

907.11.1 Scope. This section shall apply to new and existing fire alarm systems.

907.11.2 Design review: All construction documents shall be reviewed by a NICET III, an ESA/NTS Certified Fire Alarm Designer (CFAD) Level III Fire in fire alarms, or a licensed professional engineer (PE) in Washington prior to being submitted for permitting. The reviewing professional shall submit a stamped, signed, and dated letter; or a verification method approved by the local authority having jurisdiction indicating the system has been reviewed and meets or exceeds the design requirements of the state of Washington and the local jurisdiction (effective July 1, 2018).

History

• Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 23-23-106, § 51-54A-0907, filed 11/15/23, effective 3/16/24
• WSR 22-13-093, 23-12-107, and 23-20-027, § 51-54A-0907, filed 6/14/22, 6/7/23, and 9/25/23, effective 3/15/24
• WSR 21-04-003, § 51-54A-0907, filed 1/20/21, effective 2/20/21
• WSR 20-01-162, § 51-54A-0907, filed 12/18/19, effective 7/1/20. Statutory Authority: RCW 19.27.031, 19.27.074 and chapter 19.27 RCW. WSR 19-02-086, § 51-54A-0907, filed 1/2/19, effective 7/1/19. Statutory Authority: RCW 19.27.074 and 19.27.550. WSR 18-01-104, § 51-54A-0907, filed 12/19/17, effective 7/1/18. Statutory Authority: Chapter 19.27 RCW and RCW 19.27.031. WSR 17-10-028, § 51-54A-0907, filed 4/25/17, effective 5/26/17. Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 16-03-055, § 51-54A-0907, filed 1/16/16, effective 7/1/16. Statutory Authority: RCW 19.27.074, 19.27.020, and 19.27.031. WSR 14-24-091, § 51-54A-0907, filed 12/1/14, effective 5/1/15. Statutory Authority: RCW 19.27A.031, 19.27.074 and chapters 19.27 and 34.05 RCW. WSR 13-04-063, § 51-54A-0907, filed 2/1/13, effective 7/1/13.

Wash. Admin. Code § 51-54A-0908 Reserved.

History

• Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 16-03-055, § 51-54A-0908, filed 1/16/16, effective 7/1/16. Statutory Authority: Chapters 19.27, 19.27A, and 34.05 RCW. WSR 13-24-017, § 51-54A-0908, filed 11/21/13, effective 4/1/14. Statutory Authority: RCW 19.27A.031, 19.27.074 and chapters 19.27 and 34.05 RCW. WSR 13-04-063, § 51-54A-0908, filed 2/1/13, effective 7/1/13.

Wash. Admin. Code § 51-54A-0909 Section 909—Smoke control systems.

909.21.12 Hoistway venting. Hoistway venting need not be provided for pressurized elevator shafts.

909.21.13 Machine rooms. Elevator machine rooms shall be pressurized in accordance with this section unless separated from the hoistway shaft by construction in accordance with Section 707 of the International Building Code.

History

• Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 22-13-093, 23-12-107, and 23-20-027, § 51-54A-0909, filed 6/14/22, 6/7/23, and 9/25/23, effective 3/15/24
• WSR 21-04-003, § 51-54A-0909, filed 1/20/21, effective 2/20/21
• WSR 20-01-162, § 51-54A-0909, filed 12/18/19, effective 7/1/20
• WSR 16-03-055, § 51-54A-0909, filed 1/16/16, effective 7/1/16. Statutory Authority: RCW 19.27A.031, 19.27.074 and chapters 19.27 and 34.05 RCW. WSR 13-04-063, § 51-54A-0909, filed 2/1/13, effective 7/1/13.

Wash. Admin. Code § 51-54A-0913 Section 913—Fire pumps.

913.2.1 Protection of fire pump rooms and access. Fire pumps shall be located in rooms that are separated from all other areas of the building by 2-hour fire barriers constructed in accordance with Section 707 of the International Building Code or 2-hour horizontal assemblies constructed in accordance with Section 711 of the International Building Code, or both. Fire pump rooms not directly accessible from the outside shall be accessible through an enclosed passageway from an interior exit stairway or exterior exit. The enclosed passageway shall have a fire-resistance rating not less than the fire-resistance rating of the fire pump room (see NFPA 20 Section 4.14.2.1.2).

History

• Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 22-13-093, 23-12-107, and 23-20-027, § 51-54A-0913, filed 6/14/22, 6/7/23, and 9/25/23, effective 3/15/24.

Wash. Admin. Code § 51-54A-0915 Carbon monoxide detection.

915.1.1 Where required. Carbon monoxide detection shall be provided in Group I and R occupancies and in classrooms in Group E occupancies in the locations specified in Section 915.2 where any of the conditions in Sections 915.1.2 through 915.1.6 exist.

| EXCEPTIONS: | 1. R-2 occupancies, with the exception of R-2 college dormitories, are required to install carbon monoxide detectors without exception. | | --- | --- | | | 2. Sleeping units or dwelling units in I and R-1 occupancies and R-2 college dormitories, hotel, DOC prisons and work releases and assisted living facilities and residential treatment facilities licensed by the state of Washington, which do not themselves contain a fuel-burning appliance, a fuel-burning fireplace, or have an attached garage, need not be provided with carbon monoxide alarms provided that they comply with the exceptions of Section 915.1.4. |

915.2.1 Dwelling units. Carbon monoxide detection shall be installed outside of each separate sleeping area in the immediate vicinity of the bedrooms and on each level of the dwelling. Where a fuel-burning appliance or a fuel-burning fireplace is located within a bedroom or its attached bathroom, carbon monoxide detection shall be installed within the bedroom.

915.2.3 Group E occupancies. When required by Section 915.1 in new buildings, or by Chapter 11 of the International Fire Code, carbon monoxide detection shall be installed in classrooms in Group E occupancies. Carbon monoxide alarm signals shall be automatically transmitted to an on-site location that is staffed by school personnel.

| EXCEPTIONS: | 1. Carbon monoxide alarm signals shall not be required to be automatically transmitted to an on-site location that is staffed by school personnel in Group E occupancies with an occupant load of 50 or less. | | --- | --- | | | 2. Carbon monoxide alarm signals shall not be required to be automatically transmitted to an on-site location that is staffed by school personnel in Group E occupancies where an exception contained in Section 915.1 applies, or in Group E occupancies where signals are transmitted to an off-site service monitored by a third party, such as a service that monitors fire protection systems in the building. |

915.5.1 General. Carbon monoxide detection systems shall comply with NFPA 72. Carbon monoxide detectors shall be listed in accordance with UL 2075.

915.5.2 Locations. Carbon monoxide detectors shall be installed in the locations specified in Section 915.2. These locations supersede the locations specified in NFPA 72.

915.6 Maintenance. Carbon monoxide alarms and carbon monoxide detection systems shall be maintained in accordance with NFPA 72. Carbon monoxide alarms and carbon monoxide detectors that become inoperable or begin producing end-of-life signals shall be replaced.

History

• Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 22-13-093, 23-12-107, and 23-20-027, § 51-54A-0915, filed 6/14/22, 6/7/23, and 9/25/23, effective 3/15/24
• WSR 20-01-162, § 51-54A-0915, filed 12/18/19, effective 7/1/20
• WSR 16-03-055, § 51-54A-0915, filed 1/16/16, effective 7/1/16. Statutory Authority: RCW 19.27A.031, 19.27.074 and chapters 19.27 and 34.05 RCW. WSR 13-04-063, § 51-54A-0915, filed 2/1/13, effective 7/1/13.

Wash. Admin. Code § 51-54A-0916 Reserved.

History

• Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 20-01-162, § 51-54A-0916, filed 12/18/19, effective 7/1/20
• WSR 16-03-055, § 51-54A-0916, filed 1/16/16, effective 7/1/16.

Wash. Admin. Code § 51-54A-0918 Reserved.

History

• Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 22-13-093, 23-12-107, and 23-20-027, § 51-54A-0918, filed 6/14/22, 6/7/23, and 9/25/23, effective 3/15/24
• WSR 20-01-162, § 51-54A-0918, filed 12/18/19, effective 7/1/20.

Wash. Admin. Code § 51-54A-1003 General means of egress.

1003.7 Elevators, escalators, and moving walks. Elevators, escalators, and moving walks shall not be used as a component of a required means of egress from any other part of the building.

| EXCEPTIONS: | 1. Elevators used as an accessible means of egress in accordance with Section 1009.4. | | --- | --- | | | 2. Escalators used as a means of egress for fixed transit and passenger rail systems in accordance with Section 4901. |

History

• Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 23-23-106, § 51-54A-1003, filed 11/15/23, effective 3/16/24
• WSR 22-13-093, 23-12-107, and 23-20-027, § 51-54A-1003, filed 6/14/22, 6/7/23, and 9/25/23, effective 3/15/24.

Wash. Admin. Code § 51-54A-1004 Occupant load.

1004.5 Areas without fixed seating. The number of occupants shall be computed at the rate of one occupant per unit of area as prescribed in Table 1004.5. For areas without fixed seating, the occupant load shall be not less than that number determined by dividing the floor area under consideration by the occupant load factor assigned to the function of the space as set forth in Table 1004.5. Where an intended function is not listed in Table 1004.5, the fire code official shall establish a function based on a listed function that most nearly resembles the intended function.

| EXCEPTION: | Where approved by the fire code official, the actual number of occupants for whom each occupied space, floor, or building is designed, although less than those determined by calculation, shall be permitted to be used in the determination of the design occupant load. | | --- | --- |

1004.5.1 Increased occupant load. The occupant load permitted in any building, or portion thereof, is permitted to be increased from that number established for the occupancies in Table 1004.5, provided that all other requirements of the code are met based on such modified number and the occupant load does not exceed one occupant per 7 square feet (0.65 m2) of occupiable floor space. Where required by the fire code official, an approved aisle, seating or fixed equipment diagram substantiating any increase in occupant load shall be submitted. Where required by the fire code official, such diagram shall be posted.

Table 1004.5

Maximum Floor Area Allowances Per Occupant

| Function of Space | Occupant Load Factora | | | --- | --- | --- | | Accessory storage areas, mechanical equipment room | 300 gross | | | Agricultural building | 300 gross | | | Aircraft hangars | 500 gross | | | Airport terminal | | | | | Baggage claim Baggage handling Concourse Waiting areas | 20 gross 300 gross 100 gross 15 gross | | Assembly | | | | | Gaming floors (keno,slots, etc.) Exhibit gallery and museum Billiard table/game table area | 11 gross 30 net 50 gross | | Assembly with fixed seats | See Section 1004.6 | | | Assembly without fixed seats | | | | | Concentrated (chairs only - Not fixed) Standing space Unconcentrated (tables and chairs) | 7 net 5 net 15 net | | Bowling centers, allow 5 persons for each lane including 15 feet of runway and for additional areas | 7 net | | | Business areas | 150 gross | | | | Concentrated business use areas | See Section 1004.8 | | Courtrooms - Other than fixed seating areas | 40 net | | | Day care | 35 net | | | Dormitories | 50 gross | | | Educational | | | | | Classroom area Shops and other vocational room areas | 20 net 50 net | | Exercise rooms | 50 gross | | | Fixed guideway transit and passenger rail systems | | | | | Platform Concourse/lobby | 100 gross (See Section 4901) | | Group H-5 fabrication and manufacturing areas | 200 gross | | | Industrial areas | 100 gross | | | Institutional areas | | | | | Inpatient treatment areas Outpatient areas Sleeping areas | 240 gross 100 gross 120 gross | | Kitchens, commercial | 200 gross | | | Library | | | | | Reading rooms Stack area | 50 net 100 gross | | Locker rooms | 50 gross | | | Mall buildings - Covered and open | See Section 402.8.2 of the IBC | | | Mercantile | | | | | Storage, stock, shipping areas | 60 gross 300 gross | | Parking garages | 200 gross | | | Residential | 200 gross | | | Skating rinks, swimming pools | | | | | Rink and pool Decks | 50 gross 15 gross | | Stages and platforms | 15 net | | | Warehouses | 500 gross | | | For SI: 1 foot = 304.8 mm, 1 square foot = 0.0929 m2 | | |

| a | Floor area in square feet per occupant. | | --- | --- |

History

• Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 22-13-093, 23-12-107, and 23-20-027, § 51-54A-1004, filed 6/14/22, 6/7/23, and 9/25/23, effective 3/15/24.

Wash. Admin. Code § 51-54A-1005 Means of egress sizing.

1005.1 General. All portions of the means of egress system shall be sized in accordance with this section.

| EXCEPTIONS: | 1. Aisles and aisle access ways in rooms or spaces used for assembly purposes complying with Section 1030. | | --- | --- | | | 2. The capacity in inches, of means of egress components for fixed guideway transit and passenger rail stations, shall meet the requirements of Section 4901. |

History

• Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 22-13-093, 23-12-107, and 23-20-027, § 51-54A-1005, filed 6/14/22, 6/7/23, and 9/25/23, effective 3/15/24.

Wash. Admin. Code § 51-54A-1006 Number of exits and exit access doorways.

1006.2.1 Egress based on occupant load and common path of egress travel distance. Two exits or exit access doorways from any space shall be provided where the design occupant load or the common path of egress travel distance exceeds the values listed in Table 1006.2.1. The cumulative occupant load from adjacent rooms, areas or spaces shall be determined in accordance with Section 1004.2.

| EXCEPTIONS: | 1. The number of exits from foyers, lobbies, vestibules or similar spaces need not be based on cumulative occupant loads for areas discharging through such spaces, but the capacity of the exits from such spaces shall be based on applicable cumulative occupant loads. | | --- | --- | | | 2. Care suites in Group I-2 occupancies complying with Section 407.4 of the International Building Code. | | | 3. Unoccupied mechanical rooms and penthouses are not required to comply with the common path of egress travel distance measurement. | | | 4. The common path of travel for fixed transit and passenger rail system stations shall be in accordance with Section 4901. |

1006.2.1.1 Three or more exits or exit access doorways. Three exits or exit access doorways shall be provided from any space with an occupant load of 501 to 1,000. Four exits or exit access doorways shall be provided from any space with an occupant load greater than 1,000.

| EXCEPTION: | The number of required exits for fixed transit and passenger rail systems may be reduced by one at open stations. | | --- | --- |

1006.3.4 Single exits. A single exit or access to a single exit shall be permitted from any story or occupied roof where one of the following conditions exists:

1. The occupant load, number of dwelling units and exit access travel distance within the portion of the building served by the single exit do not exceed the values in Table 1006.3.4(1) or 1006.3.4(2).

2. Rooms, areas and spaces complying with Section 1006.2.1 with exits that discharge directly to the exterior at the level of exit discharge, are permitted to have one exit or access to a single exit.

3. Parking garages where vehicles are mechanically parked shall be permitted to have one exit or access to a single exit.

4. Groups R-3 and R-4 occupancies shall be permitted to have one exit or access to a single exit.

5. Individual single-story or multistory dwelling units shall be permitted to have a single exit or access to a single exit from the dwelling unit provided that both of the following criteria are met:

5.1. The dwelling unit complies with Section 1006.2.1 as a space with one means of egress.

5.2. Either the exit from the dwelling unit discharges directly to the exterior at the level of exit discharge, or the exit access outside the dwelling unit's entrance door provides access to not less than two approved independent exits.

History

• Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 23-23-106, § 51-54A-1006, filed 11/15/23, effective 3/16/24
• WSR 22-13-093, 23-12-107, and 23-20-027, § 51-54A-1006, filed 6/14/22, 6/7/23, and 9/25/23, effective 3/15/24.

Wash. Admin. Code § 51-54A-1007 Reserved.

History

• Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 16-03-055, § 51-54A-1007, filed 1/16/16, effective 7/1/16. Statutory Authority: RCW 19.27A.031, 19.27.074 and chapters 19.27 and 34.05 RCW. WSR 13-04-063, § 51-54A-1007, filed 2/1/13, effective 7/1/13.

Wash. Admin. Code § 51-54A-1008 Means of egress illumination.

1008.2.3 Exit discharge. This subsection is not adopted.

History

• Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 22-13-093, 23-12-107, and 23-20-027, § 51-54A-1008, filed 6/14/22, 6/7/23, and 9/25/23, effective 3/15/24
• WSR 16-03-055, § 51-54A-1008, filed 1/16/16, effective 7/1/16. Statutory Authority: RCW 19.27A.031, 19.27.074 and chapters 19.27 and 34.05 RCW. WSR 13-04-063, § 51-54A-1008, filed 2/1/13, effective 7/1/13.

Wash. Admin. Code § 51-54A-1009 Accessible means of egress.

1009.1 Accessible means of egress required. Accessible means of egress shall comply with this section. Accessible spaces shall be provided with not less than one accessible means of egress. Where more than one means of egress is required by Section 1006.2 or 1006.3 from any accessible space, each accessible portion of the space shall be served by not less than two accessible means of egress.

| EXCEPTIONS: | 1. One accessible means of egress is required from an accessible mezzanine level in accordance with Section 1009.3, 1009.4 or 1009.5. | | --- | --- | | | 2. In assembly areas with ramped aisles or stepped aisles one accessible means of egress is permitted where the common path of egress travel is accessible and meets the requirements in Section 1030.8. | | | 3. In parking garages, accessible means of egress are not required to serve parking areas that do not contain accessible parking spaces. |

1009.8 Two-way communication. A two-way communication system complying with Sections 1009.8.1 and 1009.8.2 shall be provided at the landing serving each elevator or bank of elevators on each accessible floor that is one or more stories above or below the level of exit discharge.

| EXCEPTIONS: | 1. Two-way communication systems are not required at the landing serving each elevator or bank of elevators where the two-way communication system is provided within areas of refuge in accordance with Section 1009.6.5. | | --- | --- | | | 2. Two-way communication systems are not required on floors provided with ramps that provide a direct path of egress travel to grade or the level of exit discharge conforming to the provisions of Section 1012. | | | 3. Two-way communication systems are not required at the landings serving only service elevators that are not designated as part of the accessible means of egress or serve as part of the required accessible route into a facility. | | | 4. Two-way communication systems are not required at the landings serving only freight elevators. | | | 5. Two-way communication systems are not required at the landing serving a private residence elevator. | | | 6. Two-way communication systems are not required in Group I-2 or I-3 facilities. |

1009.8.1 System requirements. Two-way communication systems shall provide communication between each required location and the fire command center or a central control point location approved by the fire department. Where the central control point is not a constantly attended location, the two-way communication system shall have a timed automatic telephone dial-out capability that provides two-way communication with an approved supervising station. The two-way communication system shall include both audible and visible signals. The two-way communication system shall have a battery backup or an approved alternate source of power that is capable of 90 minutes use upon failure of the normal power source.

History

• Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 22-13-093, 23-12-107, and 23-20-027, § 51-54A-1009, filed 6/14/22, 6/7/23, and 9/25/23, effective 3/15/24
• WSR 20-01-162, § 51-54A-1009, filed 12/18/19, effective 7/1/20
• WSR 16-03-055, § 51-54A-1009, filed 1/16/16, effective 7/1/16. Statutory Authority: RCW 19.27A.031, 19.27.074 and chapters 19.27 and 34.05 RCW. WSR 13-04-063, § 51-54A-1009, filed 2/1/13, effective 7/1/13.

Wash. Admin. Code § 51-54A-1010 Doors, gates and turnstiles.

1010.2.4 Locks and latches. Locks and latches shall be permitted to prevent operation of doors where any of the following exists:

1. Places of detention or restraint.

2. In buildings in occupancy Group A having an occupant load of 300 or less, Groups B, F, M, and S, and in places of religious worship, the main door or doors are permitted to be equipped with key-operated locking devices from the egress side provided:

2.1. The locking device is readily distinguishable as locked;

2.2. A readily visible sign is posted on the egress side on or adjacent to the door stating: THIS DOOR TO REMAIN UNLOCKED WHEN BUILDING IS OCCUPIED. The sign shall be in letters 1 inch (25 mm) high on a contrasting background; and

2.3. The use of the key-operated locking device is revocable by the building official for due cause.

3. Where egress doors are used in pairs, approved automatic flush bolts shall be permitted to be used, provided that the door leaf having the automatic flush bolts has no doorknob or surface-mounted hardware.

4. Doors from individual dwelling or sleeping units of Group R occupancies having an occupant load of 10 or less are permitted to be equipped with a night latch, dead bolt, or security chain, provided such devices are openable from the inside without the use of a key or a tool.

5. Fire doors after the minimum elevated temperature has disabled the unlatching mechanism in accordance with listed fire door test procedures.

6. Doors serving roofs not intended to be occupied shall be permitted to be locked preventing entry to the building from the roof.

7. Approved, listed locks without delayed egress shall be permitted in Group I-1 condition 2 assisted living facilities licensed under chapter 388-78A WAC and Group I-1 Condition 2 residential treatment facilities licensed under chapter 246-337 WAC by the state of Washington, provided that:

7.1. The clinical needs of one or more patients require specialized security measures for their safety.

7.2. The doors unlock upon actuation of the automatic sprinkler system or automatic fire detection system.

7.3. The doors unlock upon loss of electrical power controlling the lock or lock mechanism.

7.4. The lock shall be capable of being deactivated by a signal from a switch located in an approved location.

7.5. There is a system, such as a keypad and code, in place that allows visitors, staff persons and appropriate residents to exit. Instructions for exiting shall be posted within 6 feet of the door.

8. Other than egress courts, where occupants must egress from an exterior space through the building for means of egress, exit access doors shall be permitted to be equipped with an approved locking device where installed and operated in accordance with all of the following:

8.1. The occupant load of the occupied exterior area shall not exceed 300 as determined by IBC Section 1004.

8.2. The maximum occupant load shall be posted where required by Section 1004.9. Such sign shall be permanently affixed inside the building and shall be posted in a conspicuous space near all the exit access doorways.

8.3. A weatherproof telephone or two-way communication system installed in accordance with Sections 1009.8.1 and 1009.8.2 shall be located adjacent to not less than one required exit access door on the exterior side.

8.4. The egress door locking device is readily distinguishable as locked and shall be a key-operated locking device.

8.5. A clear window or glazed door opening, not less than 5 square feet (0.46 m2) in area, shall be provided at each exit access door to determine if there are occupants using the outdoor area.

8.6. A readily visible durable sign shall be posted on the interior side on or adjacent to each locked required exit access door serving the exterior area stating: THIS DOOR TO REMAIN UNLOCKED WHEN THE OUTDOOR AREA IS OCCUPIED. The letters on the sign shall be not less than 1 inch high on a contrasting background.

9. Locking devices are permitted on doors to balconies, decks, or other exterior spaces serving individual dwelling or sleeping units.

10. Locking devices are permitted on doors to balconies, decks, or other exterior spaces of 250 square feet or less, serving a private office space.

1010.2.14 Controlled egress doors in Groups I-1 and I-2. Electric locking systems, including electromechanical locking systems and electromagnetic locking systems, shall be permitted to be locked in the means of egress in Group I-1 or I-2 occupancies where the clinical needs of persons receiving care require their containment. Controlled egress doors shall be permitted in such occupancies where the building is equipped throughout with an automatic sprinkler system in accordance with Section 903.3.1.1 or an approved automatic smoke or heat detection system installed in accordance with Section 907, provided that the doors are installed and operate in accordance with all of the following:

1. The doors shall unlock on actuation of the automatic sprinkler system or automatic smoke detection system.

2. The door locks shall unlock on loss of power controlling the lock or lock mechanism.

3. The door locking system shall be installed to have the capability of being unlocked by a switch located at the fire command center, a nursing station or other approved location. The switch shall directly break power to the lock.

4. A building occupant shall not be required to pass through more than one door equipped with a controlled egress locking system before entering an exit.

5. The procedures for unlocking the doors shall be described and approved as part of the emergency planning and preparedness required by Chapter 4 of the International Fire Code.

6. There is a system, such as a keypad and code, in place that allows visitors, staff persons and appropriate residents to exit. Instructions for exiting shall be posted within 6 feet of the door.

7. All clinical staff shall have the keys, codes or other means necessary to operate the locking systems.

8. Emergency lighting shall be provided at the door.

9. The door locking system units shall be listed in accordance with UL 294.

| EXCEPTIONS: | 1. Items 1 through 4 and 6 shall not apply to doors to areas where persons, which because of clinical needs, require restraint or containment as part of the function of a psychiatric treatment area. | | --- | --- | | | 2. Items 1 through 4 and 6 shall not apply to doors to areas where a listed egress control system is utilized to reduce the risk of child abduction from nursery and obstetric areas of a Group I-2 hospital. |

1010.3.4 Security grilles. In Groups B, F, M and S, horizontal sliding or vertical security grilles are permitted at the main exit and shall be openable from the inside without the use of a key or special knowledge or effort during periods that the space is occupied. The grilles shall remain secured in the full-open position during the period of occupancy by the general public. Where two or more exits or access to exits are required, not more than one-half of the exits or exit access doorways shall be equipped with horizontal sliding or vertical security grilles.

1010.3.4.1 Fixed transit and passenger rail systems. In fixed transit and passenger rail system stations horizontal and vertical security grilles are permitted at station entrances as a component in the means of egress when the station is under constant supervision by on-site security personnel and an exit door with panic hardware that swings in the direction of egress, with a minimum clear width of 32 inches (813 mm), provided within 10 feet of the gate. The security grilles shall remain secured in the full-open position during the period of occupancy by the general public.

History

• Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 23-23-106, § 51-54A-1010, filed 11/15/23, effective 3/16/24
• WSR 22-13-093, 23-12-107, and 23-20-027, § 51-54A-1010, filed 6/14/22, 6/7/23, and 9/25/23, effective 3/15/24
• WSR 21-04-003, § 51-54A-1010, filed 1/20/21, effective 2/20/21
• WSR 19-24-058, § 51-54A-1010, filed 11/27/19, effective 7/1/20
• WSR 16-03-055, § 51-54A-1010, filed 1/16/16, effective 7/1/16. Statutory Authority: RCW 19.27A.031, 19.27.074 and chapters 19.27 and 34.05 RCW. WSR 13-04-063, § 51-54A-1010, filed 2/1/13, effective 7/1/13.

Wash. Admin. Code § 51-54A-1011 Stairways.

1011.17 Stairways in individual dwelling units. Stairs or ladders within an individual dwelling unit used for access to areas of 200 square feet (18.6 m2) or less, and not containing the primary bathroom or kitchen, are exempt from the requirements of Section 1009.

History

• Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 16-03-055, § 51-54A-1011, filed 1/16/16, effective 7/1/16.

Wash. Admin. Code § 51-54A-1012 Ramps.

1012.1 Scope. The provisions of this section shall apply to ramps used as a component of a means of egress.

| EXCEPTIONS: | 1. Other than ramps that are part of the accessible routes providing access in accordance with Sections 1108.2 through 1108.6 of the International Building Code ramped aisles within assembly rooms or spaces shall conform with the provisions in Section 1030. | | --- | --- | | | 2. Curb ramps shall comply with ICC A117.1. | | | 3. Vehicle ramps in parking garages for pedestrian exit access shall not be required to comply with Sections 1012.3 through 1012.10 of the International Building Code when they are not an accessible route serving accessible parking spaces or other required accessible elements. | | | 4. In a parking garage where one accessible means of egress serving accessible parking spaces or other accessible elements is provided, a second accessible means of egress serving that area may include a vehicle ramp that does not comply with Sections 1012.5, 1012.6, and 1012.9 of the International Building Code. A landing complying with Sections 1012.6.1 and 1012.6.4 of the International Building Code shall be provided at any change of direction in the accessible means of egress. |

History

• Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 22-13-093, 23-12-107, and 23-20-027, § 51-54A-1012, filed 6/14/22, 6/7/23, and 9/25/23, effective 3/15/24
• WSR 16-03-055, § 51-54A-1012, filed 1/16/16, effective 7/1/16.

Wash. Admin. Code § 51-54A-1014 Section 1014—Handrails.

1014.2 Height and location. Handrails serving flights of stairways, ramps, stepped aisles, and ramped aisles shall comply with the provisions of Sections 1014.2.1 and 1014.2.2.

1014.2.1 Height.Handrail height, measured above stair tread nosings, or finish surface of ramp slope, shall be uniform, not less than 34 inches (864 mm) and not more than 38 inches (965 mm). Handrail height of alternating tread devices and ships ladders, measured above tread nosings, shall be uniform, not less than 30 inches (762 mm) and not more than 34 inches (864 mm).

| EXCEPTIONS: | 1. Where handrail fittings or bendings are used to provide continuous transition between flights, the fittings or bendings shall be permitted to exceed the maximum height. | | --- | --- | | | 2. In Group R-3 occupancies; within dwelling units in Group R-2 occupancies; and in Group U occupancies that are associated with a Group R-3 occupancy or associated with individual dwelling units in Group R-2 occupancies; where handrail fittings or bendings are used to provide continuous transition between flights, transition at winder treads, transition from handrail to guard, or where used at the start of a flight, the handrail height at the fittings or bendings shall be permitted to exceed the maximum height. | | | 3. Handrails on top of a guard where permitted along stepped aisles and ramped aisles in accordance with Section 1030.16. |

1014.2.2 Lateral location. Handrails located outward from the edge of the walking surface of flights of stairways, ramps, stepped aisles, and ramped aisles shall be located within 6 inches (152 mm) measured horizontally from the edge of the walking surface. Handrails projecting into the width of the walking surface shall comply with Section 1014.8.

1014.8 Projections. On ramps and on ramped aisles that are part of an accessible route, the clear width between handrails shall be 36 inches (914 mm) minimum. Projections into the required width of stepped and ramped aisles, flights of stairways and ramps at each side shall not exceed 4.5 inches (114 mm) at or below the handrail height. Projections into the required width shall not be limited above the minimum headroom height required in Section 1011.3. Projections due to intermediate handrails shall not constitute a reduction in the egress width. Where a pair of intermediate handrails are provided within the stairway width without a walking surface between the pair of intermediate handrails and the distance between the pair of intermediate handrails is greater than 6 inches (152 mm), the available egress width shall be reduced by the distance between the closest edges of each such intermediate pair of handrails that is greater than 6 inches (152 mm).

History

• Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 23-23-106, § 51-54A-1014, filed 11/15/23, effective 3/16/24.

Wash. Admin. Code § 51-54A-1015 Section 1015—Guards.

1015.2 Where required.Guards shall be located along open-sided walking surfaces, including mezzanines, equipment platforms, lofts in accordance with Section 420.14 of the International Building Code, aisles, stairs, ramps, and landings that are located more than 30 inches (762 mm) measured vertically to the floor or grade below at any point within 36 inches (914 mm) horizontally to the edge of the open side. Guards shall be provided at the perimeter of the occupied portions of an occupied roof. Guards shall be adequate in strength and attachment in accordance with Section 1607.9 of the International Building Code.

| EXCEPTION: | Guards are not required for the following locations: | | --- | --- | | | 1. On the loading side of loading docks or piers. | | | 2. On the audience side of stages and raised platforms, including stairs leading up to the stage and raised platforms. | | | 3. On raised stage and platform floor areas, such as runways, ramps, and side stages used for entertainment or presentations. | | | 4. At vertical openings in the performance area of stages and platforms. | | | 5. At elevated walking surfaces appurtenant to stages and platforms for access to and utilization of special lighting or equipment. | | | 6. Along vehicle service pits not accessible to the public. | | | 7. In assembly seating areas at cross aisles in accordance with Section 1030.17.2. | | | 8. On the loading side of station platforms on fixed guideway transit or passenger rail stations. | | | 9. Portions of an occupied roof located less than 30 inches measured vertically to adjacent unoccupied roof areas when approved guards are present at the perimeter of the roof. | | | 10. At an occupied portion of an occupied roof where a barrier approved by the building official is provided. |

1015.3 Height. Required guards shall be not less than 42 inches (1067 mm) high, measured vertically as follows:

1. From the adjacent walking surfaces.

2. On stairways and stepped aisles, from the line connecting the leading edges of the tread nosings.

3. On ramps and ramped aisles, from the ramp surface at the guard.

| EXCEPTIONS: | 1. For occupancies in Group R-3 not more than three stories above grade in height and within individual dwelling units in occupancies in Group R-2 not more than three stories above grade in height with separate means of egress, required guards shall be not less than 36 inches (914 mm) in height measured vertically above the adjacent walking surfaces. | | --- | --- | | | 2. For occupancies in Group R-3, and within individual dwelling units in occupancies in Group R-2, guards on the open sides of stairs shall have a height not less than 34 inches (864 mm) measured vertically from a line connecting the leading edges of the treads. | | | 3. For occupancies in Group R-3, and within individual dwelling units in occupancies in Group R-2, where the top of the guard serves as a handrail on the open sides of stairs, the top of the guard shall be not less than 34 inches (864 mm) and not more than 38 inches (965 mm) measured vertically from a line connecting the leading edges of the treads. | | | 4. In areas with ceiling heights of 7 feet (2134 mm) or less in lofts constructed in accordance with Section 420.14, guards shall not be less than 36 inches (914 mm) in height or one-half of the clear height from the loft floor to the loft ceiling, whichever is less. | | | 5. The guard height in assembly seating areas shall comply with Section 1030.17 as applicable. | | | 6. Along alternating tread devices and ships ladders, guards where the top rail serves as a handrail shall have height not less than 30 inches (762 mm) and not more than 34 inches (864 mm), measured vertically from the leading edge of the device tread nosing. | | | 7. In Group F occupancies where exit access stairways serve fewer than three stories and such stairways are not open to the public, and where the top of the guard also serves as a handrail, the top of the guard shall be not less than 34 inches (864 mm) and not more than 38 inches (965 mm) measured vertically from a line connecting the leading edges of the treads. |

History

• Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 23-23-106, § 51-54A-1015, filed 11/15/23, effective 3/16/24.

Wash. Admin. Code § 51-54A-1017 Exit access travel distance.

Table 1017.2

Exit Access Travel Distancea

| Occupancy | Without Sprinkler System (feet) | With Sprinkler System (feet) | | --- | --- | --- | | A, E, F-1, M, R, S-1 | 200e | 250b | | I-1 | Not Permitted | 250b | | B | 200 | 300c | | F-2, S-2, U | 300 | 400c | | H-1 | Not Permitted | 75d | | H-2 | Not Permitted | 100d | | H-3 | Not Permitted | 150d | | H-4 | Not Permitted | 175d | | H-5 | Not Permitted | 200c | | I-2, I-3 | Not Permitted | 200c | | I-4 | 150 | 200c |

| For SI: 1 foot = 304.8 mm. | | | --- | --- | | a | See the following sections for modifications to exit access travel distance requirements: | | | • Section 402.8 of the International Building Code: For the distance limitation in malls. | | | • Section 407.4 of the International Building Code: For the distance limitation in Group I-2. | | | • Sections 408.6.1 and 408.8.1 of the International Building Code: For the distance limitations in Group I-3. | | | • Section 411.2 of the International Building Code: For the distance limitation in special amusement areas. | | | • Section 412.6 of the International Building Code: For the distance limitations in aircraft manufacturing facilities. | | | • Section 1006.2.2.2: For the distance limitation in refrigeration machinery rooms. | | | • Section 1006.2.2.3: For the distance limitation in refrigerated rooms and spaces. | | | • Section 1006.3.4: For buildings with one exit. | | | • Section 1017.2.2: For increased distance limitation in Groups F-1 and S-1. | | | • Section 1030.7: For increased limitation in assembly seating. | | | • Section 3103.4 of the International Building Code: For temporary structures. | | | • Section 3104.9 of the International Building Code: For pedestrian walkways. | | | • Section 4901: For fixed guideway and passenger rail stations. | | b | Buildings equipped throughout with an automatic sprinkler system in accordance with Section 903.3.1.1 or 903.3.1.2. See Section 903 for occupancies where automatic sprinkler systems are permitted in accordance with Section 903.3.1.2. | | c | Buildings equipped throughout with an automatic sprinkler system in accordance with Section 903.3.1.1. | | d | Group H occupancies equipped throughout with an automatic sprinkler system in accordance with Section 903.2.5.1. | | e | Group R-3 and R-4 buildings equipped throughout with an automatic sprinkler system in accordance with Section 903.3.1.3. See Section 903.2.8 for occupancies where automatic sprinkler systems are permitted in accordance with Section 903.3.1.3. |

History

• Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 23-23-106, § 51-54A-1017, filed 11/15/23, effective 3/16/24
• WSR 22-13-093, 23-12-107, and 23-20-027, § 51-54A-1017, filed 6/14/22, 6/7/23, and 9/25/23, effective 3/15/24.

Wash. Admin. Code § 51-54A-1018 Reserved.

History

• Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 16-03-055, § 51-54A-1018, filed 1/16/16, effective 7/1/16. Statutory Authority: RCW 19.27A.031, 19.27.074 and chapters 19.27 and 34.05 RCW. WSR 13-04-063, § 51-54A-1018, filed 2/1/13, effective 7/1/13.

Wash. Admin. Code § 51-54A-1019 Reserved.

History

• Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 23-23-106, § 51-54A-1019, filed 11/15/23, effective 3/16/24
• WSR 22-13-093, 23-12-107, and 23-20-027, § 51-54A-1019, filed 6/14/22, 6/7/23, and 9/25/23, effective 3/15/24.

Wash. Admin. Code § 51-54A-1020 Corridors.

1020.6 Air movement in corridors. Corridors shall not serve as supply, return, exhaust, relief or ventilation air ducts.

| EXCEPTIONS: | 1. Use of a corridor as a source of makeup air for exhaust systems in rooms that open directly onto such corridors, including toilet rooms, bathrooms, dressing rooms, smoking lounges and janitor closets, shall be permitted provided that each such corridor is directly supplied with outdoor air at a rate greater than the rate of makeup air taken from the corridor. | | --- | --- | | | 2. Where located within a dwelling unit, the use of corridors for conveying return air shall not be prohibited. | | | 3. Where located within tenant spaces of 1,000 square feet (93 m2) or less in area, utilization of corridors for conveying return air is permitted. | | | 4. Incidental air movement from pressurized rooms within health care facilities, provided that a corridor is not the primary source of supply or return to the room. | | | 5. Where such air is part of an engineered smoke control system. | | | 6. Air supplied to corridors serving residential occupancies shall not be considered as providing ventilation air to the dwelling units subject to the following: | | | 6.1. The air supplied to the corridor is 100 percent outside air; and | | | 6.2. The units served by the corridor have conforming ventilation air independent of the air supplied to the corridor; and | | | 6.3. For other than high-rise buildings, the supply fan will automatically shut off upon activation of corridor smoke detectors which shall be spaced at no more than 30 feet (9144 mm) on center along the corridor; or | | | 6.4. For high-rise buildings, corridor smoke detector activation will close required smoke/fire dampers at the supply inlet to the corridor at the floor receiving the alarm. |

History

• Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 22-13-093, 23-12-107, and 23-20-027, § 51-54A-1020, filed 6/14/22, 6/7/23, and 9/25/23, effective 3/15/24
• WSR 16-03-055, § 51-54A-1020, filed 1/16/16, effective 7/1/16.

Wash. Admin. Code § 51-54A-1021 Reserved.

History

• Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 16-03-055, § 51-54A-1021, filed 1/16/16, effective 7/1/16. Statutory Authority: RCW 19.27A.031, 19.27.074 and chapters 19.27 and 34.05 RCW. WSR 13-04-063, § 51-54A-1021, filed 2/1/13, effective 7/1/13.

Wash. Admin. Code § 51-54A-1023 Section 1023—Interior exit stairways and ramps.

1023.12 Smokeproof enclosures. Where required by Section 403.5.4, 405.7.2 or 412.2.2.1, of the International Building Code, interior exit stairways and ramps shall be smokeproof enclosures in accordance with Section 909.20 of the International Building Code. Where interior exit stairways and ramps are pressurized in accordance with Section 909.20.5 of the International Building Code, the smoke control pressurization system shall comply with the requirements specified in Section 909.6.3 of the International Building Code.

History

• Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 22-13-093, 23-12-107, and 23-20-027, § 51-54A-1023, filed 6/14/22, 6/7/23, and 9/25/23, effective 3/15/24.

Wash. Admin. Code § 51-54A-1028 Reserved.

History

• Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 20-01-162, § 51-54A-1028, filed 12/18/19, effective 7/1/20
• WSR 16-03-055, § 51-54A-1028, filed 1/16/16, effective 7/1/16.

Wash. Admin. Code § 51-54A-1030 Reserved.

History

• Statutory Authority: Chapter 19.27 RCW. WSR 17-10-023, § 51-54A-1030, filed 4/25/17, effective 5/26/17. Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 16-03-055, § 51-54A-1030, filed 1/16/16, effective 7/1/16.

Wash. Admin. Code § 51-54A-1103 Fire safety requirements for existing buildings.

1103.2 Emergency responder communication enhancement in existing buildings. Existing buildings other than Group R-3, that do not have approved in-building, emergency response communication enhancement system for emergency responders in the building based on existing coverage levels of the public safety communication systems, shall be equipped with such coverage according to one of the following:

1. Where an existing wired communication system cannot be repaired or is being replaced, or where not approved in accordance with Section 510.1, Exception 1.

2. Within a time frame established by the adopting authority.

| EXCEPTION: | Where it is determined by the fire code official that the in-building, emergency responder communication enhancement system is not needed. | | --- | --- |

1103.4.3More than five stories. In other than Group I occupancies, interior vertical openings connecting more than five stories shall be protected by fire-resistant and smoke-rated construction.

| EXCEPTIONS: | 1. Vertical opening protection is not required for Group R-3 occupancies. | | --- | --- | | | 2. Vertical opening protection is not required for open parking garages and ramps. | | | 3. Vertical opening protection for escalators shall be in accordance with Section 1103.4.8. |

1103.5.6 Nightclub. An automatic sprinkler system shall be provided throughout A-2 nightclubs as defined in this code. No building shall be constructed for, used for, or converted to occupancy as a nightclub except in accordance with this section.

1103.9 Carbon monoxide alarms. Existing Group I or Group R occupancies shall be provided with single station carbon monoxide alarms in accordance with Section 915.4.3. An inspection will occur when alterations, repairs or additions requiring a permit occur, or when one or more sleeping rooms are added or created. The carbon monoxide alarms shall be listed as complying with UL 2034 and be installed and maintained in accordance with NFPA 72 and the manufacturer's instructions.

| EXCEPTIONS: | 1. For other than R-2 occupancies, if the building does not contain a fuel-burning appliance, a fuel-burning fireplace, or an attached garage. | | --- | --- | | | 2. Work involving the exterior surfaces of dwellings, such as the replacement of roofing or siding, or the addition or replacement of windows or doors, or the addition of a porch or deck, or electrical permits. | | | 3. Installation, alteration or repairs of noncombustion plumbing or mechanical systems. | | | 4. Sleeping units or dwelling units in I and R-1 occupancies and R-2 college dormitories, hotel, DOC prisons and work releases and assisted living facilities and residential treatment facilities licensed by the state of Washington which do not themselves contain a fuel-burning appliance, a fuel-burning fireplace, or have an attached garage, need not be provided with carbon monoxide alarms provided that: | | | 4.1. The sleeping units or dwelling unit is not adjacent to any room which contains a fuel-burning appliance, a fuel-burning fireplace, or an attached garage; and | | | 4.2. The sleeping units or dwelling unit is not connected by duct work or ventilation shafts with a supply or return register in the same room to any room containing a fuel-burning appliance, a fuel-burning fireplace, or to an attached garage; and | | | 4.3. The building is provided with a common area carbon monoxide detection system. | | | 5. An open parking garage, as defined in the International Building Code, or enclosed parking garage ventilated in accordance with Section 404 of the International Mechanical Code shall not be considered an attached garage. |

History

• Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 22-13-093, 23-12-107, and 23-20-027, § 51-54A-1103, filed 6/14/22, 6/7/23, and 9/25/23, effective 3/15/24
• WSR 16-03-055, § 51-54A-1103, filed 1/16/16, effective 7/1/16. Statutory Authority: Chapters 19.27, 19.27A, and 34.05 RCW. WSR 13-24-017, § 51-54A-1103, filed 11/21/13, effective 4/1/14. Statutory Authority: RCW 19.27A.031, 19.27.074 and chapters 19.27 and 34.05 RCW. WSR 13-04-063, § 51-54A-1103, filed 2/1/13, effective 7/1/13.

Wash. Admin. Code § 51-54A-1104 Means of egress for existing buildings.

1104.1 General. Means of egress in existing buildings shall comply with Section 1032 and 1104.2 through 1104.25.

| EXCEPTION: | Means of egress conforming to the requirements of the building code under which they were constructed and Section 1032 shall not be required to comply with 1104.2 through 1104.22 and 1104.25. | | --- | --- |

History

• Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 23-23-106, § 51-54A-1104, filed 11/15/23, effective 3/16/24
• WSR 22-13-093, 23-12-107, and 23-20-027, § 51-54A-1104, filed 6/14/22, 6/7/23, and 9/25/23, effective 3/15/24
• WSR 16-05-065, § 51-54A-1104, filed 2/12/16, effective 7/1/16. Statutory Authority: RCW 19.27A.031, 19.27.074 and chapters 19.27 and 34.05 RCW. WSR 13-04-063, § 51-54A-1104, filed 2/1/13, effective 7/1/13.

Wash. Admin. Code § 51-54A-1105 Construction requirements for existing Group I-2.

1105.1 General. This section shall be applied by jurisdictions conducting surveys for compliance with the federal centers for medicare and medicaid reimbursement program. Existing Group I-2 shall meet all of the following requirements:

1. The minimum fire safety requirements in Section 1103.

2. The minimum means of egress requirements in Section 1104.

3. The additional egress and construction requirements in Section 1105.

Where the provisions of this chapter conflict with the construction requirements that applied at the time of construction, the most restrictive provisions shall apply.

History

• Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 16-03-055, § 51-54A-1105, filed 1/16/16, effective 7/1/16.

Wash. Admin. Code § 51-54A-1201 General.

1201.1 Scope. The provisions of this chapter shall apply to the installation, operation, maintenance, repair, retrofitting, testing, commissioning and decommissioning of energy systems used for generating or storing energy including, but not limited to, energy storage systems under the exclusive control of an electric utility or lawfully designated agency. It shall not apply to equipment associated with the generation, control, transformation, transmission, or distribution of energy installations that is under the exclusive control of an electric utility or lawfully designated agency. Energy storage systems regulated by WAC 51-54A-1207 shall comply with this chapter as appropriate and NFPA 855.

1201.3 Mixed system installation. Where mixed systems are approved, the aggregate nameplate kWh energy of all energy storage systems in a fire area shall not exceed the maximum quantity specified for any of the energy systems in this chapter. Where required by the fire code official, a hazard mitigation analysis shall be provided and approved in accordance with Section 104.8.2 to evaluate any potential adverse interaction between the various energy systems and technologies.

History

• Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 23-22-119, § 51-54A-1201, filed 10/31/23, effective 3/15/24.

Wash. Admin. Code § 51-54A-1204 Reserved.

History

• Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 22-13-093, 23-12-107, and 23-20-027, § 51-54A-1204, filed 6/14/22, 6/7/23, and 9/25/23, effective 3/15/24
• WSR 21-04-003, § 51-54A-1204, filed 1/20/21, effective 2/20/21
• WSR 20-01-162, § 51-54A-1204, filed 12/18/19, effective 7/1/20.

Wash. Admin. Code § 51-54A-1205 Section 1205—Solar photovoltaic power systems.

1205.1 General. Installation, modification, or alteration of solar photovoltaic power systems shall comply with this section. Due to the emerging technologies in the solar photovoltaic industry, it is understood fire code officials may need to amend prescriptive requirements of this section to meet the requirements for firefighter access and product installations. Section 104.10 Alternative materials and methods of this code shall be considered when approving the installation of solar photovoltaic power systems. Solar photovoltaic power systems shall be installed in accordance with Sections 1205.2.1 through 1205.6, the International Building Code, and chapter 19.28 RCW.

1205.2.1 Solar photovoltaic systems for Group R-3 residential and buildings built under the International Residential Code. Solar photovoltaic systems for Group R-3 residential and buildings built under the International Residential Code shall comply with Sections 1205.2.1.1 through 1205.2.3.

| EXCEPTIONS: | 1. Residential dwellings with an approved automatic fire sprinkler system installed. | | --- | --- | | | 2. Residential dwellings with approved mechanical or passive ventilation systems. | | | 3. Where the fire code official determines that the slope of the roof is too steep for emergency access. | | | 4. Where the fire code official determines that vertical ventilation tactics will not be utilized. | | | 5. These requirements shall not apply to roofs where the total combined area of the solar array does not exceed 33 percent as measured in plan view of the total roof area of the structure, where the solar array will measure 1,000 sq. ft. or less in area, and where a minimum 18 inches unobstructed pathway shall be maintained along each side of any horizontal ridge. |

1205.6 Size of solar photovoltaic array.

1. Each photovoltaic array shall be limited to 150 feet (45,720 mm) by 150 feet (45,720 mm). Multiple arrays shall be separated by a 3-foot wide (914 mm) clear access pathway.

2. Panels/modules shall be located up to the roof ridge where an alternative ventilation method approved by the fire code official has determined vertical ventilation techniques will not be employed.

History

• Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 23-23-106, § 51-54A-1205, filed 11/15/23, effective 3/16/24
• WSR 22-13-093, 23-12-107, and 23-20-027, § 51-54A-1205, filed 6/14/22, 6/7/23, and 9/25/23, effective 3/15/24.

Wash. Admin. Code § 51-54A-1206 Stationary fuel cell power systems.

1206.1 General. Stationary fuel cell power systems in new and existing occupancies shall comply with this section.

| EXCEPTION: | The temporary use of a fuel cell-powered electric vehicle to power a Group R-3 or R-4 building while parked shall comply with Section 1206.13. | | --- | --- |

1206.5 Residential use. Stationary fuel cell power systems shall not be installed in Group R-3 and R-4 buildings, or dwelling units associated with Group R-2 buildings unless they are specifically listed for residential use.

| EXCEPTION: | The temporary use of a fuel cell-powered electric vehicle to power a Group R-3 or R-4 building while parked shall comply with Section 1206.13. | | --- | --- |

1206.6.3 Gas detection systems. Stationary fuel cell power systems shall be provided with a gas detection system. Detection shall be provided in approved locations in the fuel cell power system enclosure, the exhaust system, or the room that encloses the fuel cell power system. The system shall be designed to activate at a flammable gas concentration of not more than 25 percent of the lower flammable limit (LFL).

1206.6.3.1 System activation. The activation of the gas detection system shall automatically:

1. Close valves between the gas supply and the fuel cell power system.

2. Shut down the fuel cell power system.

3. Initiate local audible and visible alarms in approved locations.

History

• Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 23-22-119, § 51-54A-1206, filed 10/31/23, effective 3/15/24.

Wash. Admin. Code § 51-54A-1207 Electrical energy storage systems.

1207.1 General. The provisions in this section are applicable to stationary and mobile electrical energy storage systems (ESS).

| EXCEPTION: | ESS in Group R-3 and R-4 occupancies not exceeding thresholds in Section 1207.11.4 shall comply with Section 1207.11 through 1207.11.9. | | --- | --- |

1207.1.1 Scope. ESS having capacities exceeding the values shown in Table 1207.1.1 shall comply with this section.

TABLE 1207.1.1

Energy Storage System (ESS) Threshold Quantities

| Technology | Energy Capacitya | | --- | --- | | Capacitor ESS | 3 kWh | | Flow batteriesb | 20 kWh | | Lead-acid batteries, all types | 70 kWhc | | Lithium-ion batteries | 20 kWh | | Sodium nickel chloride batteries | 70 kWh | | Nickel-cadmium batteries (Ni-Cd), Nickel Metal Hydride (Ni-MH), and Nickel Zinc (Ni-Zn) batteries | 70 kWh | | Nonelectrochemical ESSd | 70 kWh | | Other battery technologies | 10 kWh | | Other electrochemical ESS technologies | 3 kWh | | Zinc manganese dioxide batteries (Zn-MnO2) | 70 kWh |

| For SI: 1 kilowatt-hour = 3.6 megajoules. | | | --- | --- | | a | Energy capacity is the total energy capable of being stored (nameplate rating), not the usable energy rating. For units rated in amp-hours, kWh shall equal rated voltage times amp-hour rating divided by 1,000. | | b | Shall include vanadium, zinc-bromine, polysulfide-bromide and other flowing electrolyte-type technologies. | | c | Fifty gallons of lead-acid battery electrolyte shall be considered equivalent to 70 kWh. | | d | Covers nonelectrochemical technologies such as flywheel and thermal ESS. |

1207.1.1.1 Utilities and industrial applications. This section shall not apply to capacitors and capacitor equipment for electric utilities and industrial facilities used in applications such as flexible ac transmission (FACTS) devices, filter capacitor banks, power factor correction, and standalone capacitor banks for voltage correction and stabilization.

1207.1.1.2 Mobile ESS. Mobile ESS deployed at an electric utility substation or generation facility for 90 days or less shall not add to the threshold values in Table 1207.1.1 for the stationary ESS installation if both of the following conditions apply:

1. The mobile ESS complies with Section 1207.10.

2. The mobile ESS is only being used during periods in which the facility's stationary ESS is being tested, repaired, retrofitted, or replaced.

1207.1.3 Construction documents. The following information shall be provided with the permit application:

1. Location and layout diagram of the room or area in which the ESS is to be installed.

2. Details on the hourly fire-resistance ratings of assemblies enclosing the ESS.

3. The quantities and types of ESS to be installed.

4. Manufacturer's specifications, ratings, and documentation of the listings of each ESS and associated equipment.

5. Description of energy (battery) management systems and their operation.

6. Location and content of required signage.

7. Details on fire suppression, smoke or fire detection, thermal management, ventilation, exhaust, and deflagration venting systems, if provided.

8. Support arrangement associated with the installation, including any required seismic restraint.

9. A commissioning plan complying with Section 1207.2.1.

10. A decommissioning plan complying with Section 1207.2.3.

11. A fire safety and evacuation plan in accordance with Section 404.

1207.1.3.1 Utilities applicability. Plans and specifications associated with ESS owned and operated by electric utilities as a component of the electric grid that are considered critical infrastructure documents in accordance with the provisions of the North American Electric Reliability Corporation and other applicable governmental laws and regulations shall be made available to the fire code official for viewing based on the requirements of the applicable governmental laws and regulations.

1207.1.4 Hazard mitigation analysis. Failure modes and effects analysis (FMEA) or other approved hazard mitigation analysis shall be provided in accordance with Section 104.8.2 under any of the following conditions:

1. Where ESS technologies not specifically identified in Table 1207.1.1 are provided.

2. More than one ESS technology is provided in a single fire area where there is a potential for adverse interaction between technologies.

3. Where allowed as a basis for increasing maximum allowable quantities. See Section 1207.5.2.

4. Where flammable gases can be produced under abnormal conditions.

5. Where required by the fire code official to address a potential hazard with an ESS installation that is not addressed by existing requirements.

1207.1.4.1 Fault condition. The hazard mitigation analysis shall evaluate the consequences of the following failure modes. Only single failure modes shall be considered.

1. A thermal runaway condition in a single electrochemical ESS unit.

2. A mechanical failure of a nonelectrochemical ESS unit.

3. Failure of any battery (energy) management system or fire protection system within the ESS equipment that is not covered by the product listing failure mode effects analysis (FMEA).

4. Failure of any required protection system external to the ESS including, but not limited to, ventilation (HVAC), exhaust ventilation, smoke detection, fire detection, gas detection, or fire suppression system.

1207.1.4.2 Analysis approval. The fire code official is authorized to approve the hazardous mitigation analysis provided that the consequences of the hazard mitigation analysis demonstrate:

1. Fires will be contained within unoccupied ESS rooms or areas for the minimum duration of the fire-resistance-rated separations identified in Section 1207.7.4.

2. Fires involving the ESS will allow occupants or the general public to evacuate to a safe location.

1207.1.5 Large-scale fire test. Where required elsewhere in Section 1207, large-scale fire testing shall be conducted on a representative ESS in accordance with UL 9540A. The testing shall be conducted or witnessed and reported by an approved testing laboratory and show that a fire involving one ESS will not propagate to an adjacent ESS, and where installed within buildings, enclosed areas and walk-in units will be contained within the room, enclosed area or walk-in unit for the duration of the test. The test report shall be provided to the fire code official for review and approval in accordance with Section 104.8.2.

1207.1.6.1 Fire mitigation personnel. Where, in the opinion of the fire code official, it is essential for public safety that trained personnel be on-site to respond to possible ignition or re-ignition of a damaged ESS, the system owner, agent, or lessee shall dispatch within 15 minutes one or more fire mitigation personnel to the premise, as required and approved, at their expense. These personnel shall remain on duty continuously after the fire department leaves the premise until the damaged energy storage equipment is removed from the premises, or earlier if the fire code official indicates the public safety hazard has been abated.

1207.2.1 Commissioning. Commissioning of newly installed ESS and existing ESS that have been retrofitted, replaced, or previously decommissioned and are returning to service shall be conducted prior to the ESS being placed in service in accordance with a commissioning plan that has been approved prior to initiating commissioning. The commissioning plan shall include the following:

1. A narrative description of the activities that will be accomplished during each phase of commissioning, including the personnel intended to accomplish each of the activities.

2. A listing of the specific ESS and associated components, controls, and safety-related devices to be tested, a description of the tests to be performed, and the functions to be tested.

3. Conditions under which all testing will be performed, which are representative of the conditions during normal operation of the system.

4. Documentation of the owner's project requirements and the basis of design necessary to understand the installation and operation of the ESS.

5. Verification that required equipment and systems are installed in accordance with the approved plans and specifications.

6. Integrated testing for all fire and safety systems.

7. Testing for any required thermal management, ventilation, or exhaust systems associated with the ESS installation.

8. Preparation and delivery of operation and maintenance documentation.

9. Training of facility operating and maintenance staff.

10. Identification and documentation of the requirements for maintaining system performance to meet the original design intent during the operation phase.

11. Identification and documentation of personnel who are qualified to service, maintain and decommission the ESS, and respond to incidents involving the ESS, including documentation that such service has been contracted for.

12. A decommissioning plan for removing the ESS from service, and from the facility in which it is located. The plan shall include details on providing a safe, orderly shutdown of energy storage and safety systems with notification to the code officials prior to the actual decommissioning of the system. The decommissioning plan shall include contingencies for removing an intact operational ESS from service, and for removing an ESS from service that has been damaged by a fire or other event.

| EXCEPTIONS: | Commissioning shall not be required for lead-acid and nickel-cadmium battery systems at facilities under the exclusive control of communications utilities that comply with NFPA 76 and operate at less than 50 VAC and 60 VDC. A decommissioning plan shall be provided and maintained where required by the fire code official. | | --- | --- | | | 1. Lead-acid and nickel-cadmium battery systems less than 50 VAC, 60 VDC that are in telecommunications facilities for installations of communications equipment under the exclusive control of communications utilities and located outdoors or in building spaces or walk-in units used exclusively for such installations that are in compliance with NFPA 76 shall be permitted to have a commissioning plan in compliance with recognized industry practices in lieu of complying with Section 1207.2.1. | | | 2. Lead-acid and nickel-cadmium battery systems that are used for dc power for control of substations and control or safe shutdown of generating stations under the exclusive control of the electric utilities, and located in building spaces or walk-in units used exclusively for such installations shall be permitted to have a commissioning plan in compliance with applicable governmental laws and regulations in lieu of developing a commissioning plan in accordance with Section 1207.2.1. |

1207.3.1 Energy storage system listings. ESS shall be listed in accordance with UL 9540.

| EXCEPTIONS: | 1. Lead-acid and nickel-cadmium battery systems less than 50 VAC, 60 VDC in telecommunications facilities for installations of communications equipment under the exclusive control of communications utilities located outdoors or in building spaces used exclusively for such installations that are in compliance with NFPA 76. | | --- | --- | | | 2. Lead-acid and nickel-cadmium battery systems that are used for dc power for control of substations and control or safe shutdown of generating stations under the exclusive control of the electric utility, and located outdoors or in building spaces used exclusively for such installations. | | | 3. Lead-acid battery systems in uninterruptible power supplies listed and labeled in accordance with UL 1778 and utilized for standby power applications. |

1207.3.7.1 Retrofitting lead acid and nickel cadmium. Changing out or retrofitting of lead-acid and nickel-cadmium batteries in the following applications shall be considered repairs where there is no increase in system size or energy capacity greater than 10 percent of the original design.

1. At facilities under the exclusive control of communications utilities that comply with NFPA 76 and operate at less than 50 VAC and 60 VDC.

2. Battery systems used for dc power for control of substations and control or safe shutdown of generating stations under the exclusive control of the electric utility, and located outdoors or in building spaces used exclusively for such installations.

3. Batteries in uninterruptible power supplies listed and labeled in accordance with UL 1778 and used for standby applications only.

1207.5 Electrochemical ESS protection. The protection of electrochemical ESS shall be in accordance with Sections 1207.5.1 through 1207.5.8 where required by Sections 1207.7 through 1207.10.

TABLE 1207.5

Maximum Allowable Quantities of Electrochemical ESS

| Technology | Maximum Allowable Quantitiesa | | --- | --- | | Storage Batteries | | | Flow batteriesb | 600 kWh | | Lead-acid, all types | Unlimited | | Lithium-ion | 600 kWh | | Sodium nickel chloride | 600 kWh | | Nickel-cadmium (Ni-Cd), Nickel metal hydride (NI-MH) and nickel zinc (Ni-Zn) | Unlimited | | Zinc manganese dioxide (Zn-MnO2) | Unlimited | | Other battery technologies | 200 kWh | | Capacitors | | | All types | 20 kWh | | Other Electrochemical ESS | | | All types | 20 kWh |

| For SI: 1 kilowatt hour = 3.6 megajoules. | | | --- | --- | | a | For electrochemical ESS units rated in amp-hours, kWh shall equal rated voltage times the amp-hour rating divided by 1,000. | | b | Shall include vanadium, zinc-bromine, polysulfide-bromide, and other flowing electrolyte-type technologies. |

1207.5.1 Size and separation. Electrochemical ESS shall be segregated into groups not exceeding 50 kWh (180 mega-joules). Each group shall be separated a minimum of three feet (914 mm) from other groups and from walls in the storage room or area. The storage arrangements shall comply with Chapter 10.

| EXCEPTIONS: | 1. Lead-acid and nickel-cadmium battery systems in facilities under the exclusive control of communications utilities and operating at less than 50 VAC and 60 VDC in accordance with NFPA 76. | | --- | --- | | | 2. Lead-acid and nickel-cadmium systems that are used for dc power for control of substations and control or safe shutdown of generating stations under the exclusive control of the electric utility, and located outdoors or in building spaces used exclusively for such installations. | | | 3. Lead-acid battery systems in uninterruptible power supplies and labeled in accordance with UL 1778, utilized for standby power applications, and limited to not more than 10 percent of the floor area on the floor on which the ESS is located. | | | 4. The fire code official is authorized to approve larger capacities or smaller separation distances based on large-scale fire testing complying with Section 1207.1.5. |

1207.5.3 Elevation. Electrochemical ESS shall not be located in the following areas:

1. Where the floor is located more than 75 feet (22,860 mm) above the lowest level of fire department vehicle access.

2. Where the floor is located below the lowest level of exit discharge.

| EXCEPTIONS: | 1. Lead-acid and nickel-cadmium battery systems less than 50 VAC and 60 VDC installed in facilities under the exclusive control of communications utilities in accordance with NFPA 76. | | --- | --- | | | 2. Lead-acid and nickel-cadmium systems that are used for dc power for control of substations and control or safe shutdown of generating stations under the exclusive control of the electric utility, and located outdoors or in building spaces used exclusively for such installations. | | | 3. Lead-acid battery systems in uninterruptible power supplies and labeled in accordance with UL 1778, utilized for standby power applications, and limited to not more than 10 percent of the floor area on the floor on which the ESS is located. | | | 4. Where approved, installations shall be permitted in underground vaults complying with NFPA 70, Article 450, Part III. | | | 5. Where approved by the fire code official, installations shall be permitted on higher and lower floors. |

1207.5.4 Fire detection. An approved automatic smoke detection system or radiant energy-sensing fire detection system complying with Section 907.2 shall be installed in rooms, indoor areas, and walk-in units containing electrochemical ESS. An approved radiant energy-sensing fire detection system shall be installed to protect open parking garage and rooftop installations. Alarm signals from detection systems shall be transmitted to a central station, proprietary or remote station service in accordance with NFPA 72, or where approved to a constantly attended location.

| EXCEPTION: | Normally unoccupied, remote stand-alone telecommunications structures with a gross floor area of less than 1500 ft2 (139 m2) utilizing lead-acid or nickel-cadmium batteries shall not be required to have a fire detection system installed. | | --- | --- |

1207.5.4.1 System status. Lead-acid and nickel-cadmium battery systems that are used for dc power for control of substations and control or safe shutdown of generating stations under the exclusive control of the electric utility, and located outdoors or in building spaces used exclusively for such installations shall be allowed to use the process control system to monitor the smoke or radiant energy–sensing fire detectors required in Section 1207.5.4.

1207.5.5 Fire suppression systems. Rooms and areas within buildings and walk-in units containing electrochemical ESS shall be protected by an automatic fire suppression system designed and installed in accordance with one of the following:

1. Automatic sprinkler systems, designed and installed in accordance with Section 903.3.1.1 for ESS units (groups) with a maximum stored energy capacity of 50 kWh, as described in Section 1207.5.1, shall be designed with a minimum density of 0.3 gpm/ft2 (1.14 L/min) based over the area of the room or 2,500 square-foot (232 m2) design area, whichever is smaller, unless a lower density is approved based upon large-scale fire testing in accordance with Section 1207.1.5.

2. Automatic sprinkler system designed and installed in accordance with Section 903.3.1.1 for ESS units (groups) exceeding 50 kWh shall use a density based on large-scale fire testing complying with Section 1207.1.5.

3. The following alternative automatic fire-extinguishing systems designed and installed in accordance with Section 904, provided that the installation is approved by the fire code official based on large-scale fire testing complying with Section 1207.1.5:

3.1. NFPA 12, Standard on Carbon Dioxide Extinguishing Systems.

3.2. NFPA 15, Standard for Water Spray Fixed Systems for Fire Protection.

3.3. NFPA 750, Standard on Water Mist Fire Protection Systems.

3.4. NFPA 2001, Standard on Clean Agent Fire-Extinguishing Systems.

3.5. NFPA 2010, Standard for Fixed Aerosol Fire-Extinguishing Systems.

| EXCEPTIONS: | 1. Fire suppression systems for lead-acid and nickel-cadmium battery systems at facilities under the exclusive control of communications utilities that operate at less than 50 VAC and 60 VDC shall be provided where required by NFPA 76. | | --- | --- | | | 2. Lead-acid and nickel-cadmium systems that are used for dc power for control of substations and control or safe shutdown of generating stations under the exclusive control of the electric utility, and located outdoors or in building spaces used exclusively for such installations, shall not be required to have a fire suppression system installed. | | | 3. Lead-acid battery systems in uninterruptible power supplies listed and labeled in accordance with UL 1778, utilized for standby power applications, which is limited to not more than 10 percent of the floor area on the floor on which the ESS is located, shall not be required to have a fire suppression system. |

1207.6 Electrochemical ESS technology-specific protection. Electrochemical ESS installations shall comply with the requirements of this section in accordance with the applicable requirements of Table 1207.6.

TABLE 1207.6

Electrochemical ESS Technology-Specific Requirements

| Compliance Requiredb | Battery Technology | | | | | | | | | | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | | Feature | Section | Lead-acid | Nickel cadmium (Ni-Cd), nickel metal hydride (Ni-MH) and nickel zinc (Ni-Zn) | Zinc manganese dioxide (ZnMnO2) | Lithium-ion | Flow | Sodium nickel chloride | Other ESS and Battery Technologiesb | Capacitor ESSb | | Exhaust ventilation | 1207.6.1 | Yes | Yes | Yes | No | Yes | No | Yes | Yes | | Explosion control | 1207.6.3 | Yesa | Yesa | Yes | Yes | No | Yes | Yes | Yes | | Safety caps | 1207.6.4 | Yes | Yes | Yes | No | No | No | Yes | Yes | | Spill control and neutralization | 1207.6.2 | Yesc | Yesc | Yesf | No | Yes | No | Yes | Yes | | Thermal runaway | 1207.6.5 | Yesd | Yesd | Yese | Yese | No | Yes | Yese | Yes |

| a | Not required for lead-acid and nickel-cadmium batteries at facilities under the exclusive control of communications utilities that comply with NFPA 76 and operate at less than 50 VAC and 60 VDC. | | --- | --- | | b | Protection shall be provided unless documentation acceptable to the fire code official is provided in accordance with Section 104.8.2 that provides justification why the protection is not necessary based on the technology used. | | c | Applicable to vented-type (i.e., flooded) nickel-cadmium and lead-acid batteries. | | d | Not required for vented-type (i.e., flooded) batteries. | | e | The thermal runaway protection is permitted to be part of a battery management system that has been evaluated with the battery as part of the evaluation to UL 1973. | | f | Not required for batteries with jelled electrolyte. |

1207.6.3 Explosion control. Where required by Table 1207.6 or elsewhere in this code, explosion control complying with Section 911 shall be provided for rooms, areas, ESS cabinets, or ESS walk-in units containing electrochemical ESS technologies.

| EXCEPTIONS: | 1. Where approved, explosion control is permitted to be waived by the fire code official based on large-scale fire testing complying with Section 1207.1.5 that demonstrates that flammable gases are not liberated from electrochemical ESS cells or modules. | | --- | --- | | | 2. Where approved, explosion control is permitted to be waived by the fire code official based on documentation provided in accordance with Section 104.8 that demonstrates that the electrochemical ESS technology to be used does not have the potential to release flammable gas concentrations in excess of 25 percent of the LFL anywhere in the room, area, walk-in unit or structure under thermal runaway, or other fault conditions. | | | 3. Where approved, ESS cabinets that have no debris, shrapnel, or enclosure pieces ejected during large scale fire testing complying with Section 1207.1.5 shall be permitted in lieu of providing explosion control complying with Section 911. | | | 4. Explosion control is not required for lead-acid and nickel-cadmium battery systems less than 50 VAC, 60 VDC in telecommunication facilities under the exclusive control of communications utilities located in building spaces or walk-in units used exclusively for such installations. | | | 5. Explosion control is not required for lead-acid and nickel-cadmium systems used for dc power for control of substations and control or safe shutdown of generating stations under the exclusive control of the electric utility located in building spaces or walk-in units used exclusively for such installations. | | | 6. Explosion control is not required for lead-acid battery systems in uninterruptible power supplies listed and labeled in accordance with UL 1778, utilized for standby power applications, and housed in a single cabinet in a single fire area in buildings or walk-in units. |

1207.10.1 Charging and storage. For the purpose of Section 1207.10, charging and storage covers the operation where mobile ESS are charged and stored so they are ready for deployment to another site, and where they are charged and stored after a deployment.

| EXCEPTION: | Mobile ESS used to temporarily provide power to lead-acid and nickel-cadmium systems that are used for dc power for control of substations and control or safe shutdown of generating stations under the exclusive control of the electric utility, and located outdoors or in building spaces used exclusively for such installations. | | --- | --- |

1207.10.2 Deployment. For the purpose of Section 1207.10, deployment covers operations where mobile ESS are located at a site other than the charging and storage site and are being used to provide power.

| EXCEPTION: | Mobile ESS used to temporarily provide power to lead-acid and nickel-cadmium systems that are used for dc power for control of substations and control or safe shutdown of generating stations under the exclusive control of the electric utility, and located outdoors or in building spaces used exclusively for such installations. | | --- | --- |

1207.11 ESS in Group R-3 and R-4 occupancies. ESS in Group R-3 and R-4 occupancies shall be in accordance with Sections 1207.11.1 through 1207.11.9.

| EXCEPTIONS: | 1. ESS listed and labeled in accordance with UL 9540 and marked "For use in residential dwelling units", where installed in accordance with the manufacturer's instructions and NFPA 70. | | --- | --- | | | 2. ESS rated less than 1 kWh (3.6 megajoules). |

1207.11.1 Equipment listings. ESS shall be listed and labeled in accordance with UL 9540.

| EXCEPTIONS: | Not adopted. | | --- | --- |

1207.11.2.1 Spacing. Individual ESS units shall be separated from each other by at least three feet (914 mm) except where smaller separation distances are documented to be adequate based on large-scale fire testing complying with Section 1207.1.5.

1207.11.3 Location. ESS shall be installed only in the following locations:

1. Detached garages and detached accessory structures.

2. Attached garages separated from the dwelling unit living space and sleeping units in accordance with Section 406.3.2 of the International Building Code.

3. Outdoors or on the exterior side of exterior walls located a minimum of three feet (914 mm) from doors and windows directly entering the dwelling unit.

4. Enclosed utility closets, basements, storage or utility spaces within dwelling units and sleeping units with finished or noncombustible walls and ceilings. Walls and ceilings of unfinished wood-framed construction shall be provided with not less than 5/8 in. Type X gypsum wallboard.

ESS shall not be installed in sleeping rooms, or closets or spaces opening directly into sleeping rooms.

1207.11.4 Energy ratings. Individual ESS units shall have a maximum rating of 20 kWh. The aggregate rating of the ESS shall not exceed:

1. 40 kWh within utility closets, basements, and storage or utility spaces.

2. 80 kWh in attached or detached garages and detached accessory structures.

3. 80 kWh on exterior walls.

4. 80 kWh outdoors on the ground.

ESS installations exceeding the permitted individual or aggregate ratings shall be installed in accordance with Sections 1207.1 through 1207.9.

1207.11.6 Fire detection. ESS installed in Group R-3 and R-4 occupancies shall comply with the following:

1. Rooms and areas within dwelling units, sleeping units, basements and attached garages in which ESS are installed shall be protected by smoke alarms in accordance with Section 907.2.11.

2. A listed heat alarm shall be installed in locations where smoke alarms cannot be installed based on their listing.

1207.11.7 Protection from impact. ESS installed in a location subject to vehicle damage shall be protected by approved barriers. Appliances in garages shall also be installed in accordance with Section 304.3 of the International Mechanical Code.

1207.11.8 Ventilation. Indoor installations of ESS that include batteries that produce hydrogen or other flammable gases during charging shall be provided with exhaust ventilation in accordance with Section 304.5 of the International Mechanical Code.

1207.11.9 Toxic and highly toxic gas. Model code section not adopted.

1207.11.10 Electric vehicle use. The temporary use of an owner or occupant's electric-powered vehicle to power a dwelling unit or sleeping unit while parked in an attached or detached garage or outdoors shall comply with the vehicle manufacturer's instructions and NFPA 70.

History

• Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 23-22-119, § 51-54A-1207, filed 10/31/23, effective 3/15/24
• WSR 22-13-093, 23-12-107, and 23-20-027, § 51-54A-1207, filed 6/14/22, 6/7/23, and 9/25/23, effective 3/15/24.

Wash. Admin. Code § 51-54A-2404 Spray finishing.

2404.2.1 Prohibited enclosures for spray application operations. Inflatable or portable enclosures shall not be used for spray application of flammable finishes.

| EXCEPTION: | Enclosures for the spray application of flammable finishes in marinas, dry docking areas, or construction areas shall comply with Section 2404.3.5. | | --- | --- |

2404.3.5 Membrane enclosures. The design, construction, protection, operation and maintenance of membrane enclosures shall be in accordance with NFPA 33.

History

• Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 22-13-093, 23-12-107, and 23-20-027, § 51-54A-2404, filed 6/14/22, 6/7/23, and 9/25/23, effective 3/15/24.

Wash. Admin. Code § 51-54A-3103 Temporary tents and membrane structures.

3103.5 Use period. Temporary tents, air-supported, air-inflated or tensioned membrane structures are permitted to be erected for a period of less than 180 days within a 12-month period on a single premises. Such structures erected for 180 days or more within a 12-month period shall comply with the IBC.

History

• Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 16-03-055, § 51-54A-3103, filed 1/16/16, effective 7/1/16.

Wash. Admin. Code § 51-54A-3303 Administrative safety controls.

3303.1.1 Components of site safety plans.Site safety plans shall include the following as applicable:

1. Name and contact information of site safety director.

2. Documentation of the training of the site safety director and fire watch personnel.

3. Procedures for reporting emergencies.

4. Fire department vehicle access routes.

5. Location of fire protection equipment, including portable fire extinguishers, standpipes, fire department connections, and fire hydrants.

6. Smoking and cooking policies, designated areas to be used where approved, and signage locations in accordance with Section 3305.7.

7. Location and safety considerations for temporary heating equipment.

8. Hot work permit plan.

9. Plans for control of combustible waste material.

10. Locations and methods for storage and use of flammable and combustible liquids and other hazardous materials.

11. Provisions for site security.

12. Changes that affect this plan.

13. Other site-specific information required by the fire code official.

3303.2.1 Training. Training of fire watch and other responsible personnel in the use of fire protection equipment shall be the responsibility of the site safety director. Records of training shall be kept and made a part of the written plan for the site safety plan.

3303.3 Daily fire safety inspection. The site safety director shall be responsible for completion of a daily fire safety inspection at the project site. Each day, all building and outdoor areas shall be inspected to ensure compliance with the inspection list in this section. The results of each inspection shall be documented and maintained on-site until a certificate of occupancy has been issued. Documentation shall be immediately available on-site for presentation to the fire code official upon request.

1. Any contractors entering the site to perform hot work each day have been instructed in the hot work safety requirements in Chapter 35, and hot work is performed only in areas approved by the site safety director.

2. Temporary heating equipment is maintained away from combustible materials in accordance with the equipment manufacturer's instructions.

3. Combustible debris, rubbish and waste material is removed from the building in areas where work is not being performed.

4. Temporary wiring does not have exposed conductors.

5. Flammable liquids and other hazardous materials are stored in locations that have been approved by the site safety director when not involved in work that is being performed.

6. Fire apparatus access roads required by Section 3307 are maintained clear of obstructions that reduce the width of the usable roadway to less than 20 feet (6096 mm).

7. Fire hydrants are clearly visible from access roads and are not obstructed.

8. The location of fire department connections to standpipe and in-service sprinkler systems are clearly identifiable from the access road and such connections are not obstructed.

9. Standpipe systems are in service and continuous to the highest work floor, as specified in Section 3307.5.

10. Portable fire extinguishers are available in locations required by Sections 3306.6 and 3305.10.2.

3303.5 Fire watch. Where required by the fire code official or the site safety plan established in accordance with Section 3303.1, a fire watch shall be provided for building demolition and for building construction.

| EXCEPTION: | New construction that is built under the International Residential Code. | | --- | --- |

3303.5.1 Fire watch during construction. A fire watch shall be provided during nonworking hours for new construction that exceeds 40 feet (12,192 mm) in height above the lowest adjacent grade at any point along the building perimeter, for new multistory construction with an aggregate area exceeding 50,000 square feet (4645 m2) per story or as required by the fire code official.

3303.5.2 Fire watch personnel. Fire watch personnel shall be provided in accordance with this section.

3303.5.2.1 Duties. The primary duty of fire watch personnel shall be to perform constant patrols and watch for the occurrence of fire. The combination of fire watch duties and site security duties is acceptable.

3303.5.2.2 Training. Personnel shall be trained to serve as an on-site fire watch. Training shall include the use of portable fire extinguishers. Fire extinguishers and fire reporting shall be in accordance with Sections 3303.6 and 3306.6.

3303.5.2.3 Means of notification. Fire watch personnel shall be provided with not fewer than one approved means for notifying the fire department.

3303.5.3 Fire watch location and records. The fire watch shall include areas specified by the site safety plan established in accordance with Section 3303.

3303.5.4 Fire watch records. Fire watch personnel shall keep a record of all time periods of duty, including the log entry for each time the site was patrolled and each time a structure was entered and inspected. Records shall be made available for review by the fire code official upon request.

3303.6 Emergency telephone. Emergency telephone facilities with ready access shall be provided in an approved location at the construction site, or an approved equivalent means of communication shall be provided. The street address of the construction site and the emergency telephone number of the fire department shall be posted adjacent to the telephone. Alternatively, where an equivalent means of communication has been approved, the site address and fire department emergency telephone number shall be posted at the main entrance to the site, in guard shacks, and in the construction site office.

History

• Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 23-23-106, § 51-54A-3303, filed 11/15/23, effective 3/16/24
• WSR 22-13-093, 23-12-107, and 23-20-027, § 51-54A-3303, filed 6/14/22, 6/7/23, and 9/25/23, effective 3/15/24.

Wash. Admin. Code § 51-54A-3304 Protection of combustible materials.

3304.1 Combustible debris, rubbish, and waste. Combustible debris, rubbish, and waste material shall comply with the requirements of Sections 3304.1.1 through 3304.2.

3304.1.1 Combustible waste material accumulation. Combustible debris, rubbish, and waste material shall not be accumulated within buildings.

3304.1.2 Combustible waste material removal. Combustible debris, rubbish, and waste material shall be removed from buildings at the end of each shift of work.

3304.1.3 Rubbish containers. Where rubbish containers with a capacity exceeding 5.33 cubic feet (40 gallons) (0.15 m) are used for temporary storage of combustible debris, rubbish, and waste material, they shall have tight-fitting or self-closing lids. Such rubbish containers shall be constructed entirely of materials that comply with either of the following:

1. Noncombustible materials.

2. Materials that meet a peak rate of heat release not exceeding 300 kW/m when tested in accordance with ASTM E1354 at an incident heat flux of 50 kW/m in the horizontal orientation.

3304.2 Spontaneous ignition. Materials susceptible to spontaneous ignition, such as oily rags, shall be stored in a listed disposal container.

History

• Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 23-23-106, § 51-54A-3304, filed 11/15/23, effective 3/16/24
• WSR 22-13-093, 23-12-107, and 23-20-027, § 51-54A-3304, filed 6/14/22, 6/7/23, and 9/25/23, effective 3/15/24
• WSR 19-24-058, § 51-54A-3304, filed 11/27/19, effective 7/1/20.

Wash. Admin. Code § 51-54A-3305 Ignition source controls.

3305.1 Listed. Temporary heating devices shall be listed and labeled. The installation, maintenance and use of temporary heating devices shall be in accordance with the listing and the manufacturer's instructions.

3305.1.1 Oil-fired heaters. Oil-fired heaters shall comply with Section 605.

3305.1.2 LP-gas heaters. Fuel supplies for liquefied-petroleum gas-fired heaters shall comply with Chapter 61 and the International Fuel Gas Code.

3305.1.3 Refueling. Refueling operations for liquid-fueled equipment or appliances shall be conducted in accordance with Section 5705. The equipment or appliance shall be allowed to cool prior to refueling.

3305.1.4 Installation. Clearance to combustibles from temporary heating devices shall be maintained in accordance with the labeled equipment. When in operation, temporary heating devices shall be fixed in place and protected from damage, dislodgement or overturning in accordance with the manufacturer's instructions.

3305.1.5 Supervision. The use of temporary heating devices shall be supervised and maintained only by competent personnel.

3305.2 Smoking. Smoking shall be prohibited except in approved areas. Signs shall be posted in accordance with Section 310. In approved areas where smoking is permitted, approved ashtrays shall be provided in accordance with Section 310.

3305.5 Cutting and welding. Welding, cutting, open torches and other hot work operations and equipment shall comply with Chapter 35.

3305.6 Electrical. Temporary wiring for electrical power and lighting installations used in connection with the construction, alteration or demolition of buildings, structures, equipment or similar activities shall comply with NFPA 70.

3305.7 Cooking. Cooking shall be prohibited except in approved designated cooking areas separated from combustible materials by a minimum of 10 feet (3048 mm). Signs with a minimum letter height of 3 inches (76 mm) and a minimum brush stroke of 1/2 inch (13 mm) shall be posted in conspicuous locations in designated cooking areas and state:

DESIGNATED COOKING AREA

COOKING OUTSIDE OF A DESIGNATED

COOKING AREA IS PROHIBITED

3305.8 Portable generators. Portable generators used at construction and demolition sites shall comply with Section 1204.

3305.9 Hot work operations. The site safety director shall ensure hot work operations and permit procedures are in accordance with Chapter 35.

3305.10 Safeguarding roof operations general. Roofing operations utilizing heat-producing systems or other ignition sources shall be conducted in accordance with Sections 3305.10.1 and 3305.10.2 and Chapter 35.

3305.10.1 Asphalt and tar kettles. Asphalt and tar kettles shall be operated in accordance with Section 303.

3305.10.2 Fire extinguishers for roofing operations. Fire extinguishers shall comply with Section 906. There shall be not less than one multiple-purpose portable fire extinguisher with a minimum 3-A 40-B:C rating on the roof being covered or repaired.

History

• Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 23-23-106, § 51-54A-3305, filed 11/15/23, effective 3/16/24
• WSR 22-13-093, 23-12-107, and 23-20-027, § 51-54A-3305, filed 6/14/22, 6/7/23, and 9/25/23, effective 3/15/24.

Wash. Admin. Code § 51-54A-3306 Fire protection systems and devices.

3306.1 Fire protection devices. The site safety director shall ensure that all fire protection equipment is maintained and serviced in accordance with this code. Fire protection equipment shall be inspected in accordance with the fire protection program.

3306.2 Impairment of fire protection systems. The site safety director shall ensure impairments to any fire protection system are in accordance with Section 901.

3306.3 Smoke detectors and smoke alarms. Smoke detectors and smoke alarms located in an area where airborne construction dust is expected shall be covered to prevent exposure to dust or shall be temporarily removed. Smoke detectors and alarms that were removed shall be replaced upon conclusion of dust-producing work. Smoke detectors and smoke alarms that were covered shall be inspected and cleaned, as necessary, upon conclusion of dust-producing work.

3306.4 Temporary covering of fire protection devices. Coverings placed on or over fire protection devices to protect them from damage during construction processes shall be immediately removed upon the completion of the construction processes in the room or area in which the devices are installed.

3306.5 Automatic sprinkler system. In buildings where an automatic sprinkler system is required by this code or the International Building Code, it shall be unlawful to occupy any portion of a building or structure until the automatic sprinkler system installation has been tested and approved, except as provided in Section 105.3.4.

3306.5.1 Operation of valves. Operation of sprinkler control valves shall be allowed only by properly authorized personnel and shall be accompanied by notification of duly designated parties. Where the sprinkler protection is being regularly turned off and on to facilitate connection of newly completed segments, the sprinkler control valves shall be checked at the end of each work period to ascertain that protection is in service.

3306.6 Portable fire extinguishers. Structures under construction, alteration or demolition shall be provided with not less than one approved portable fire extinguisher in accordance with Section 906 and sized for not less than ordinary hazard as follows:

1. At each stairway on all floor levels where combustible materials have accumulated.

2. In every storage and construction shed.

3. Additional portable fire extinguishers shall be provided where special hazards exist including, but not limited to, the storage and use of flammable and combustible liquids.

History

• Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 22-13-093, 23-12-107, and 23-20-027, § 51-54A-3306, filed 6/14/22, 6/7/23, and 9/25/23, effective 3/15/24.

Wash. Admin. Code § 51-54A-3307 Fire department site access and water supply.

3307.1 Required access.Approved vehicle access for fire fighting shall be provided to all construction or demolition sites. Vehicle access shall be provided to within 100 feet (30,480 mm) of temporary or permanent fire department connections. Vehicle access shall be provided by either temporary or permanent roads, capable of supporting vehicle loading under all weather conditions. Vehicle access shall be maintained until permanent fire apparatus access roads are available.

3307.1.1 Key boxes. Key boxes shall be provided as required by Chapter 5.

3307.1.2 Stairways required. Where building construction exceeds 40 feet (12,192 mm) in height above the lowest level of fire department vehicle access, a temporary or permanent stairway shall be provided. As construction progresses, such stairway shall be extended to within one floor of the highest point of construction having secured decking or flooring.

3307.1.3 Maintenance. Required means of egress and required accessible means of egress shall be maintained during construction and demolition, remodeling or alterations and additions to any building.

| EXEMPTION: | Approved temporary means of egress and accessible means of egress systems and facilities. | | --- | --- |

3307.2 Water supply for fire protection. An approved water supply for fire protection, either temporary or permanent, shall be made available as soon as combustible building materials arrive on the site, on commencement of vertical combustible construction and on installation of a standpipe system in buildings under construction, in accordance with Sections 3307.2.1 through 3307.4.

| EXCEPTION: | The fire code official is authorized to reduce the fire-flow requirements for isolated buildings or a group of buildings in rural areas or small communities where the development of full fire-flow requirements is impractical. | | --- | --- |

3307.2.1 Combustible building materials. When combustible building materials of the building under construction are delivered to a site, a minimum fire flow of 500 gallons per minute (1893 L/m) shall be provided. The fire hydrant used to provide this fire-flow supply shall be within 500 feet (152 m) of the combustible building materials, as measured along an approved fire apparatus access lane. Where the site configuration is such that one fire hydrant cannot be located within 500 feet (152 m) of all combustible building materials, additional fire hydrants shall be required to provide coverage in accordance with this section.

3307.2.2 Vertical construction of Types III, IV, and V construction. Prior to commencement of vertical construction of Type III, IV, or V buildings that utilize any combustible building materials, the fire flow required by Sections 3307.2.2.1 through 3307.2.2.3 shall be provided, accompanied by fire hydrants in sufficient quantity to deliver the required fire flow and proper coverage.

3307.2.2.1 Fire separation up to 30 feet. Where a building of Type III, IV, or V construction has a fire separation distance of less than 30 feet (9144 mm) from property lot lines, and an adjacent property has an existing structure or otherwise can be built on, the water supply shall provide either a minimum of 500 gallons per minute (1893 L/m) or the entire fire flow required for the building when constructed, whichever is greater.

3307.2.2.2 Fire separation of 30 feet up to 60 feet. Where a building of Type III, IV, or V construction has a fire separation distance of 30 feet (9144 mm) up to 60 feet (18,288 mm) from property lot lines, and an adjacent property has an existing structure or otherwise can be built on, the water supply shall provide a minimum of 500 gallons per minute (1893 L/m) or 50 percent of the fire flow required for the building when constructed, whichever is greater.

3307.2.2.3 Fire separation of 60 feet or greater. Where a building of Type III, IV, or V construction has a fire separation of 60 feet (18,288 mm) or greater from a property lot line, a water supply of 500 gallons per minute (1893 L/m) shall be provided.

3307.3 Vertical construction, Type I and II construction. If combustible building materials are delivered to the construction site, water supply in accordance with Section 3307.2.1 shall be provided. Additional water supply for fire flow is not required prior to commencing vertical construction of Type I and II buildings.

3307.4 Standpipe supply. Regardless of the presence of combustible building materials, the construction type or the fire separation distance, where a standpipe is required in accordance with Section 3307, a water supply providing a minimum flow of 500 gallons per minute (1893 L/m) shall be provided. The fire hydrant used for this water supply shall be located within 100 feet (30,480 mm) of the fire department connection supplying the standpipe.

3307.5 Standpipes. In buildings required to have standpipes by Section 905.3.1, not less than one standpipe shall be provided for use during construction. Such standpipes shall be installed prior to construction exceeding 40 feet (12,192 mm) in height above the lowest level of fire department vehicle access. Such standpipes shall be provided with fire department hose connections at locations adjacent to stairways complying with Section 3307.1.3. As construction progresses, such standpipes shall be extended to within one floor of the highest point of construction having secured decking or flooring.

3307.5.1 Buildings being demolished. Where a building is being demolished and a standpipe is existing within such a building, such standpipe shall be maintained in an operable condition so as to be available for use by the fire department. Such standpipe shall be demolished with the building but shall not be demolished more than one floor below the floor being demolished.

3307.5.2 Detailed requirements. Standpipes shall be installed in accordance with the provisions of Section 905.

| EXCEPTION: | Standpipes shall be either temporary or permanent in nature, and with or without a water supply, provided that such standpipes comply with the requirements of Section 905 as to capacity, outlets, and materials. | | --- | --- |

History

• Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 23-23-106, § 51-54A-3307, filed 11/15/23, effective 3/16/24
• WSR 22-13-093, 23-12-107, and 23-20-027, § 51-54A-3307, filed 6/14/22, 6/7/23, and 9/25/23, effective 3/15/24.

Wash. Admin. Code § 51-54A-3308 Motorized construction equipment.

3308.1 Conditions of use. Internal-combustion-powered construction equipment shall be used in accordance with all of the following conditions:

1. Equipment shall be located so that exhausts do not discharge against combustible material.

2. Exhausts shall be piped to the outside of the building.

3. Equipment shall not be refueled while in operation.

4. Fuel for equipment shall be stored in an approved area outside of the building.

History

• Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 22-13-093, 23-12-107, and 23-20-027, § 51-54A-3308, filed 6/14/22, 6/7/23, and 9/25/23, effective 3/15/24
• WSR 20-01-162, § 51-54A-3308, filed 12/18/19, effective 7/1/20. Statutory Authority: RCW 19.27.031, 19.27.074 and chapter 19.27 RCW. WSR 19-02-086, § 51-54A-3308, filed 1/2/19, effective 7/1/19.

Wash. Admin. Code § 51-54A-3309 Hazardous materials.

3309.1 Storage of flammable and combustible liquids. Storage of flammable and combustible liquids shall be in accordance with Section 5704.

3309.1.1 Class I and Class II liquids. The storage, use and handling of flammable and combustible liquids at construction sites shall be in accordance with Section 5706.2. Ventilation shall be provided for operations involving the application of materials containing flammable solvents.

3309.1.2 Housekeeping. Flammable and combustible liquid storage areas shall be maintained clear of combustible vegetation and waste materials. Such storage areas shall not be used for the storage of combustible materials.

3309.1.3 Precautions against fire. Sources of ignition and smoking shall be prohibited in flammable and combustible liquid storage areas. Signs shall be posted in accordance with Section 310.

3309.1.4 Handling at point of final use. Class I and II liquids shall be kept in approved safety containers.

3309.1.5 Leakage and spills. Leaking vessels shall be immediately repaired or taken out of service and spills shall be cleaned up and disposed of properly.

3309.2 Storage and handling of flammable gas. The storage, use, and handling of flammable gases shall comply with Chapter 58.

3309.2.1 Cleaning with flammable gas. Flammable gases shall not be used to clean or remove debris from piping open to the atmosphere.

3309.2.2 Pipe cleaning and purging. The cleaning and purging of flammable gas piping systems, including cleaning new or existing piping systems, purging piping systems into service and purging piping systems out of service, shall comply with NFPA 56.

| EXCEPTIONS: | 1. Compressed gas piping systems other than fuel gas piping systems where in accordance with Chapter 53. | | --- | --- | | | 2. Piping systems regulated by the International Fuel Gas Code. | | | 3. Liquefied petroleum gas systems in accordance with Chapter 61. |

3309.3 Storage and handling. Explosive materials shall be stored, used and handled in accordance with Chapter 56.

3309.3.1 Supervision. Blasting operations shall be conducted in accordance with Chapter 56.

3309.3.2 Demolition using explosives. Approved fire hoses for use by demolition personnel shall be maintained at the demolition site wherever explosives are used for demolition. Such fire hoses shall be connected to an approved water supply and shall be capable of being brought to bear on post-detonation fires anywhere on the site of the demolition operation.

History

• Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 22-13-093, 23-12-107, and 23-20-027, § 51-54A-3309, filed 6/14/22, 6/7/23, and 9/25/23, effective 3/15/24.

Wash. Admin. Code § 51-54A-3310 Additional safeguards for occupied buildings.

3310.1 Storage. Combustible materials associated with construction, demolition, remodeling or alterations to an occupied structure shall not be stored in exits, enclosures for stairways and ramps, or exit access corridors serving an occupant load of 30 or more.

| EXCEPTIONS: | 1. Where the only occupants are construction workers. | | --- | --- | | | 2. Combustible materials that are temporarily accumulated to support work being performed when workers are present. |

History

• Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 22-13-093, 23-12-107, and 23-20-027, § 51-54A-3310, filed 6/14/22, 6/7/23, and 9/25/23, effective 3/15/24.

Wash. Admin. Code § 51-54A-3311 Additional safeguards for Type I and II construction.

3311.1 Separations between construction areas. Separations used in Type I and Type II construction to separate construction areas from occupied portions of the building shall be constructed of materials that comply with one of the following:

1. Noncombustible materials.

2. Materials that exhibit a flame spread index not exceeding 25 when tested in accordance with ASTM E84 or UL 723.

3. Materials exhibiting a peak heat release rate not exceeding 300 kW/m when tested in accordance with ASTM E1354 at an incident heat flux of 50 kW/m in the horizontal orientation on specimens at the thickness intended for use.

History

• Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 22-13-093, 23-12-107, and 23-20-027, § 51-54A-3311, filed 6/14/22, 6/7/23, and 9/25/23, effective 3/15/24.

Wash. Admin. Code § 51-54A-3312 Additional safeguards for Type IV-A, IV-B, and IV-C construction.

3312.1 Fire safety requirements for buildings of Types IV-A, IV-B, and IV-C construction. Buildings of Types IV-A, IV-B, and IV-C construction designed to be greater than six stories above grade plane shall comply with the following requirements during construction unless otherwise approved by the fire code official:

1. Standpipes shall be provided in accordance with Section 3307.

2. A water supply for fire department operations, as approved by the fire code official and the fire chief.

3. Where building construction exceeds six stories above grade plane and noncombustible protection is required by Section 602.4 of the International Building Code, at least one layer of noncombustible protection shall be installed on all building elements on floor levels, including mezzanines, more than four levels below active mass timber construction before additional floor levels can be erected.

| EXCEPTIONS: | 1. Shafts and vertical exit enclosures shall not be considered part of the active mass timber construction. | | --- | --- | | | 2. Noncombustible protection on the top surface of mass timber floor assemblies shall not be required before erecting additional floor levels. |

4. Where building construction exceeds six stories above grade plane, required exterior wall coverings shall be installed on floor levels, including mezzanines, more than four levels below active mass timber construction before additional floor levels can be erected.

| EXCEPTION: | Shafts and vertical exit enclosures shall not be considered part of the active mass timber construction. | | --- | --- |

History

• Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 22-13-093, 23-12-107, and 23-20-027, § 51-54A-3312, filed 6/14/22, 6/7/23, and 9/25/23, effective 3/15/24.

Wash. Admin. Code § 51-54A-3313 Water supply for fire protection.

This section is not adopted.

History

• Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 23-23-106, § 51-54A-3313, filed 11/15/23, effective 3/16/24.

Wash. Admin. Code § 51-54A-3314 Standpipes.

This section is not adopted.

History

• Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 23-23-106, § 51-54A-3314, filed 11/15/23, effective 3/16/24.

Wash. Admin. Code § 51-54A-3315 Automatic sprinkler system.

This section is not adopted.

History

• Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 23-23-106, § 51-54A-3315, filed 11/15/23, effective 3/16/24.

Wash. Admin. Code § 51-54A-3316 Portable fire extinguishers.

This section is not adopted.

History

• Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 23-23-106, § 51-54A-3316, filed 11/15/23, effective 3/16/24.

Wash. Admin. Code § 51-54A-3317 Motorized construction equipment.

This section is not adopted.

History

• Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 23-23-106, § 51-54A-3317, filed 11/15/23, effective 3/16/24.

Wash. Admin. Code § 51-54A-3318 Safeguarding roofing operations.

This section is not adopted.

History

• Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 23-23-106, § 51-54A-3318, filed 11/15/23, effective 3/16/24.

Wash. Admin. Code § 51-54A-3601 Marinas—Scope.

3601.3 Permits. For permits to operate marine motor fuel-dispensing stations, application of flammable or combustible finishes, and hot works, see Section 105.5.

History

• Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 22-13-093, 23-12-107, and 23-20-027, § 51-54A-3601, filed 6/14/22, 6/7/23, and 9/25/23, effective 3/15/24
• WSR 20-01-162, § 51-54A-3601, filed 12/18/19, effective 7/1/20. Statutory Authority: RCW 19.27A.031, 19.27.074 and chapters 19.27 and 34.05 RCW. WSR 13-04-063, § 51-54A-3601, filed 2/1/13, effective 7/1/13.

Wash. Admin. Code § 51-54A-3602 Definitions.

3602.1 Definitions. The following terms are defined in Chapter 2:

COVERED BOAT MOORAGE

FLOAT

GRAVITY-OPERATED DROP OUT VENTS

MARINA

PIER

VESSEL

WHARF

History

• Statutory Authority: RCW 19.27A.031, 19.27.074 and chapters 19.27 and 34.05 RCW. WSR 13-04-063, § 51-54A-3602, filed 2/1/13, effective 7/1/13.

Wash. Admin. Code § 51-54A-3604 Fire protection equipment.

3604.2 Standpipes. Marinas and boatyards shall be equipped throughout with Class I manual, dry standpipe systems in accordance with NFPA 303. Systems shall be provided with hose connections located such that no point on the marina pier or float system exceeds 150 feet from a standpipe outlet.

3604.3 Access and water supply. Piers and wharves shall be provided with fire apparatus access roads and water-supply systems with on-site fire hydrants when required and approved by the fire code official. At least one fire hydrant capable of providing the required fire flow shall be provided within an approved distance of standpipe supply connections.

3604.4 Portable fire extinguishers. One 4A40BC rated fire extinguisher shall be provided at each standpipe hose connection. Additional portable fire extinguishers, suitable for the hazards involved, shall be provided and maintained in accordance with Section 906.

3604.7 Smoke and heat vents. Approved automatic smoke and heat vents shall be provided in covered boat moorage areas exceeding 2,500 sq. ft. (232 m2) in area, excluding roof overhangs.

| EXCEPTION: | Smoke and heat vents are not required in areas protected by automatic sprinklers. | | --- | --- |

3604.7.1 Design and installation. Where smoke and heat vents are required they shall be installed near the roof peak, evenly distributed and arranged so that at least one vent is over each covered berth. The effective vent area shall be calculated using a ratio of one square foot of vent to every fifteen square feet of covered berth area (1:15). Each vent shall provide a minimum opening size of 4 ft. x 4 ft.

3604.7.1.1 Smoke and heat vents. Smoke and heat vents shall operate automatically by actuation of a heat-responsive device rated at 100ºF (56ºC) above ambient.

| EXCEPTION: | Gravity-operated drop out vents. | | --- | --- |

3604.7.1.2 Gravity-operated drop out vents. Gravity-operated drop out vents shall fully open within 5 minutes after the vent cavity is exposed to a simulated fire represented by a time-temperature gradient that reaches an air temperature of 500ºF (260ºC) within 5 minutes.

3604.8 Draft curtains. Draft curtains shall be provided in covered boat moorage areas exceeding 2,500 sq. ft. (232 m2) in area, excluding roof overhangs.

| EXCEPTION: | Draft curtains are not required in areas protected by automatic sprinklers. | | --- | --- |

3604.8.1 Draft curtain construction. Draft curtains shall be constructed of sheet metal, gypsum board or other approved materials that provide equivalent performance to resist the passage of smoke. Joints and connections shall be smoke tight.

3604.8.2 Draft curtain location and depth. The maximum area protected by draft curtains shall not exceed 2,000 sq. ft. (186 m2) or two slips or berths, whichever is smaller. Draft curtains shall not extend past the piling line. Draft curtains shall have a minimum depth of 4 feet and shall not extend closer than 8 feet (2438 mm) to the walking surface of the pier.

History

• Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 22-13-093, 23-12-107, and 23-20-027, § 51-54A-3604, filed 6/14/22, 6/7/23, and 9/25/23, effective 3/15/24. Statutory Authority: RCW 19.27A.031, 19.27.074 and chapters 19.27 and 34.05 RCW. WSR 13-04-063, § 51-54A-3604, filed 2/1/13, effective 7/1/13.

Wash. Admin. Code § 51-54A-3800 Reserved.

History

• Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 21-04-003, § 51-54A-3800, filed 1/20/21, effective 2/20/21
• WSR 19-24-058, § 51-54A-3800, filed 11/27/19, effective 7/1/20. Statutory Authority: Chapter 19.27 RCW. WSR 17-03-104, § 51-54A-3800, filed 1/17/17, effective 5/1/17.

Wash. Admin. Code § 51-54A-3900 Reserved.

History

• Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 22-13-093, 23-12-107, and 23-20-027, § 51-54A-3900, filed 6/14/22, 6/7/23, and 9/25/23, effective 3/15/24
• WSR 21-04-003, § 51-54A-3900, filed 1/20/21, effective 2/20/21. Statutory Authority: RCW 19.27.031, 19.27.074 and chapter 19.27 RCW. WSR 19-02-086, § 51-54A-3900, filed 1/2/19, effective 7/1/19.

Wash. Admin. Code § 51-54A-3904 Reserved.

History

• Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 22-13-093, 23-12-107, and 23-20-027, § 51-54A-3904, filed 6/14/22, 6/7/23, and 9/25/23, effective 3/15/24
• WSR 21-04-003, § 51-54A-3904, filed 1/20/21, effective 2/20/21
• WSR 19-24-058, § 51-54A-3904, filed 11/27/19, effective 7/1/20.

Wash. Admin. Code § 51-54A-4000 Reserved.

History

• Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 22-13-093, 23-12-107, and 23-20-027, § 51-54A-4000, filed 6/14/22, 6/7/23, and 9/25/23, effective 3/15/24
• WSR 21-04-003, § 51-54A-4000, filed 1/20/21, effective 2/20/21.

Wash. Admin. Code § 51-54A-4900 Fixed guideway transit and passenger rail systems.

4901 Scope NFPA 130.

4901.1 General. Fixed guideway transit and passenger rail systems shall be in accordance with NFPA 130, as modified below.

4901.2 NFPA 130 Section 3.3.44.2. Add new definition as follows:

3.3.44.2 Traction power sub station (TPSS): A TPSS is an electrical substation consisting of switchgear transformers/rectifiers, emergency trip equipment, and other systems that converts AC electric power provided by the electrical power industry for public utility service to DC voltage to supply light rail vehicles with traction current.

4901.3 NFPA 130 Section 5.4.4 Modify NFPA 130 Sections 5.4.4.1 and 5.4.4.1.1 to read as follows:

5.4.4.1 An automatic sprinkler system shall be provided throughout enclosed stations.

| EXCEPTIONS: | 1. Traction power substation (TPSS) when located in a transformer vault designed in accordance with the NFPA 70. | | --- | --- | | | 2. Other high voltage equipment located in a transformer vault designed in accordance with the NFPA 70 when approved by the fire code official. | | | 3. Fire command centers, communication room(s), and signal rooms when protected with clean agent fire suppression and separated from other spaces with 2-hour fire rated construction. | | | 4. Other operational critical rooms when protected with clean agent fire suppression and separated from other spaces with 2-hour fire rated construction, when approved by the fire code official. |

5.4.4.1.1 An automatic sprinkler system shall be provided in areas of open stations used for concessions, markets, storage areas and similar areas with combustible loadings, and in trash rooms, electrical rooms, mechanical rooms, machinery rooms, communication rooms, and other enclosed rooms.

| EXCEPTIONS: | 1. Stations at grade with less than 1,500 sq. ft. of ancillary area/ancillary space. | | --- | --- | | | 2. Fire command centers, communication room(s), and signal rooms when protected with clean agent fire suppression and separated from other spaces with 2-hour fire rated construction. | | | 3. Other operational critical rooms when protected with clean agent fire suppression and separated from other spaces with 2-hour fire rated construction, when approved by the fire code official. |

5.4.4.2 Sprinkler protection shall be permitted to be omitted in areas of open stations separated from the station by a distance of 20 feet.

4901.4 NFPA 130 Section 5.4.5. Modify NFPA 130 Sections 5.4.5.1 as follows:

5.4.5.1 Class I standpipes shall be installed in enclosed stations in accordance with International Fire Code Section 905 except as modified herein.

4901.5 NFPA 130 Section 5.4.6. Modify NFPA 130 Sections 5.4.6 as follows:

5.4.6 Portable fire extinguishers in such number, size, type, and location in accordance with the International Fire Code Section 906.

5.4.6.1 Portable fire extinguishers are not required in public areas of at-grade stations.

4901.6 NFPA 130 Section 5.2.2. Modify NFPA 130 Section 5.2.2.2 as follows:

5.2.2.2 Construction types shall conform to the requirements in the International Building Code, Chapter 6, unless otherwise exempted in this section.

Table 5.2.2.1

Minimum Construction Requirements for New Station Structures

| Station Configuration | Construction Type† | | --- | --- | | Stations erected entirely above grade and in a separate building: | | | Open stations | Type IIB | | Enclosed stations | Type IIA | | Stations erected entirely or partially below grade: | | | Open above grade portions of below grade structures* | Type IIA | | Below grade portions of structures | Type IB | | Below grade structures with occupant loads exceeding 1000 | Type IA |

| * | Roofs not supporting an occupancy above are not required to have a fire resistance rating. | | --- | --- | | † | Construction types are in accordance with the International Building Code. |

4901.7 NFPA 130 Section 5.2.2. Modify NFPA 130 Section 5.2.4.3 as follows:

5.2.4.3 Ancillary spaces. Fire resistance ratings of separations between ancillary occupancies shall be established as required for accessory occupancies and incidental uses by the International Building Code and in accordance with ASTM E119 and ANSI/UL 263.

4901.8 NFPA 130 Section 5.2.5. Modify NFPA 130 Section 5.2.5.4 as follows:

5.2.5.4 Materials used as interior finish in open stations shall comply with the requirements of the International Building Code, Chapter 8.

4901.9 NFPA 130 Section 5.3.1. Modify NFPA 130 Section 5.3.1.1 as follows:

5.3.1.1 The provisions for means of egress for a station shall comply with the International Building Code, Chapter 10, except as herein modified.

4901.10 NFPA 130 Section 5.3.2. Add a New Section to NFPA 130 Section 5.3.2.2.1 as follows:

5.3.2.2.1 Where station occupancy is anticipated to be greater than design capacity during a major event the operating agency shall initiate approved measures to restrict access to the station, when required by the fire code official, to ensure existing means of egress are adequate as an alternative to account for peak ridership associated with major events.

4901.11 NFPA 130 Section 5.3.4. Modify NFPA 130 Section 5.3.2.4(1) as follows:

(1) The occupant load for that area shall be determined in accordance with the provisions of the International Building Code as appropriate for the use.

4901.12 NFPA 130 Section 5.3.3. Modify NFPA 130 Section 5.3.3.4 as follows:

5.3.3.4 Travel distance. For open stations the maximum travel distance on the platform to a point at which a means of egress route leaves the platform shall not exceed 100 m (325 ft.). For enclosed stations the travel distance to an exit shall not exceed 76 m (250 ft.).

4901.13 NFPA 130 Section 5.3.5. Modify NFPA 130 Section 5.3.5.3(2) as follows:

(2)* Travel speed - 14.6 m/min (48 ft./min) (indicates vertical component of travel speed).

5.3.2.4 Where an area within a station is intended for use by other than passengers or employees, the following parameters shall apply:

1. The occupant load for that area shall be determined in accordance with the provisions of the IBC NFPA 101 as appropriate for the use.

2. The additional occupant load shall be included in determining the required egress from that area.

3. The additional occupant load shall be permitted to be omitted from the station occupant load where the area has independent means of egress of sufficient number and capacity.

5.3.3.4 Travel distance. For open stations the maximum travel distance on the platform to a point at which a means of egress route leaves the platform shall not exceed 100 m (325 ft.). For enclosed stations the travel distance to an exit shall not exceed 76 m (250 ft.).

5.3.5.4 Escalators shall not account for more than one-half of the egress capacity at any one level.

4901.14 NFPA 130 Section 5.3.5. Delete NFPA 130 Section 5.3.5.5.

4901.15 NFPA 130 Section 5.3.7. Modify NFPA 130 Section 5.3.7 as follows:

5.3.7* Doors, gates, security grilles and exit hatches.

5.3.7.1 The egress capacity for doors and gates in a means of egress serving public areas shall be computed as follows:

1. Sixty people per minute (p/min) for single leaf doors and gates.

2.* 0.0819 p/mm-min (2.08 p/in.-min) for biparting multileaf doors and gates measured for the clear width dimension.

5.3.7.2.1 Security grilles are allowed when designed and operated in accordance with the International Building Code.

4901.16 NFPA 130 Section 5.3.9. Modify NFPA 130 Section 5.3.9 as follows:

5.3.9* Horizontal exits. Horizontal exits shall comply with the International Building Code Section 1026.

4901.17 NFPA 130 Section 5.3.11. Modify NFPA 130 Section 5.3.11 as follows:

5.3.11.1 Illumination of the means of egress in stations, including escalators that are considered a means of egress, shall be in accordance with the International Building Code Section 1008.

5.3.11.2 Means of egress, including escalators considered as means of egress, shall be provided with a system of emergency lighting in accordance with the International Building Code Section 1008.

4901.18 NFPA 130 Section 5.4.7. Modify NFPA 130 Section 5.4.7 as follows:

5.4.7 Emergency ventilation shall be provided in enclosed stations in accordance with Chapter 7 and the International Building Code Section 909.

History

• Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 23-23-106, § 51-54A-4900, filed 11/15/23, effective 3/16/24
• WSR 22-13-093, 23-12-107, and 23-20-027, § 51-54A-4900, filed 6/14/22, 6/7/23, and 9/25/23, effective 3/15/24.

Wash. Admin. Code § 51-54A-5003 Reserved.

History

• Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 22-13-093, 23-12-107, and 23-20-027, § 51-54A-5003, filed 6/14/22, 6/7/23, and 9/25/23, effective 3/15/24
• WSR 19-24-058, § 51-54A-5003, filed 11/27/19, effective 7/1/20.

Wash. Admin. Code § 51-54A-5306 Medical gas systems.

5306.1 General. Compressed gases at hospitals and similar facilities intended for inhalation or sedation including, but not limited to, analgesia systems for dentistry, podiatry, veterinary and similar uses shall comply with Sections 5306.2 through 5306.5 in addition to other requirements of this chapter.

| EXCEPTION: | All new distribution piping, supply manifolds, connections, regulators, valves, alarms, sensors and associated equipment shall be in accordance with the Plumbing Code. | | --- | --- |

5306.5 Medical gas systems. The maintenance and testing of medical gas systems including, but not limited to, distribution piping, supply manifolds, connections, pressure regulators and relief devices and valves, shall comply with the maintenance and testing requirements of NFPA 99 and the general provisions of this chapter.

History

• Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 23-23-106, § 51-54A-5306, filed 11/15/23, effective 3/16/24
• WSR 20-01-162, § 51-54A-5306, filed 12/18/19, effective 7/1/20. Statutory Authority: RCW 19.27A.031, 19.27.074 and chapters 19.27 and 34.05 RCW. WSR 13-04-063, § 51-54A-5306, filed 2/1/13, effective 7/1/13.

Wash. Admin. Code § 51-54A-5307 Reserved.

History

• Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 20-01-162, § 51-54A-5307, filed 12/18/19, effective 7/1/20. Statutory Authority: Chapter 19.27 RCW and RCW 19.27.031. WSR 17-10-028, § 51-54A-5307, filed 4/25/17, effective 5/26/17.

Wash. Admin. Code § 51-54A-5601 General.

5601.1 Scope. The provisions of this chapter shall govern the possession, manufacture, storage, handling, sale and use of explosives, explosive materials, and small arms ammunition. The manufacture, storage, handling, sale and use of fireworks shall be governed by chapter 70.77 RCW, and by chapter 212-17 WAC and local ordinances consistent with chapter 212-17 WAC.

| EXCEPTIONS: | 1. The Armed Forces of the United States, Coast Guard or National Guard. | | --- | --- | | | 2. Explosives in forms prescribed by the official United States Pharmacopoeia. | | | 3. The possession, storage and use of small arms ammunition when packaged in accordance with DOT packaging requirements. | | | 4. The possession, storage and use of not more than 1 pound (0.454 kg) of commercially manufactured sporting black powder, 20 pounds (9 kg) of smokeless powder and 10,000 small arms primers for hand loading of small arms ammunition for personal consumption. | | | 5. The use of explosive materials by federal, state and local regulatory, law enforcement and fire agencies acting in their official capacities. | | | 6. Special industrial explosive devices which in the aggregate contain less than 50 pounds (23 kg) of explosive materials. | | | 7. The possession, storage and use of blank industrial-power load cartridges when packaged in accordance with DOT packaging regulations. | | | 8. Transportation in accordance with DOT 49 C.F.R. Parts 100-185. | | | 9. Items preempted by federal regulations. |

5601.1.1 Explosive material standard. In addition to the requirements of this chapter, NFPA 495 shall govern the manufacture, transportation, storage, sale, handling and use of explosive materials. See also chapter 70.74 RCW and chapter 296-52 WAC.

History

• Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 20-01-162, § 51-54A-5601, filed 12/18/19, effective 7/1/20. Statutory Authority: RCW 19.27A.031, 19.27.074 and chapters 19.27 and 34.05 RCW. WSR 13-04-063, § 51-54A-5601, filed 2/1/13, effective 7/1/13.

Wash. Admin. Code § 51-54A-5704 Storage.

5704.2.11 Underground tanks. Underground storage of flammable and combustible liquids in tanks shall comply with Section 5704.2 and Sections 5704.2.11.1 through 5704.2.11.4.2. Corrosion protection shall comply with WAC 173-360-305.

History

• Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 20-01-162, § 51-54A-5704, filed 12/18/19, effective 7/1/20. Statutory Authority: RCW 19.27A.031, 19.27.074 and chapters 19.27 and 34.05 RCW. WSR 13-04-063, § 51-54A-5704, filed 2/1/13, effective 7/1/13.

Wash. Admin. Code § 51-54A-5706 Special operations.

5706.5.4.5 Commercial, industrial, governmental or manufacturing. Dispensing of Class II and III motor vehicle fuel from tank vehicles into the fuel tanks of motor vehicles located at commercial, industrial, governmental or manufacturing establishments is allowed where permitted, provided such dispensing operations are conducted in accordance with the following: (Those sections not noted here remain unchanged.)

12. Fuel delivery vehicles shall be equipped with spill clean-up supplies in accordance with the department of ecology's Source Control Best Management Practices. Such supplies shall be readily available for deployment by the operator at all times and include nonwater absorbents capable of absorbing 15 gallons (56.76 L) of diesel fuel, storm drain plug or cover kit, a nonwater absorbent containment boom of a minimum 10 foot long (3038 mm) length with a 12-gallon (45.41 L) absorbent capacity, a nonmetallic shovel, and two 5-gallon (19 L) buckets with lids.

History

• Statutory Authority: RCW 19.27A.031, 19.27.074 and chapters 19.27 and 34.05 RCW. WSR 13-04-063, § 51-54A-5706, filed 2/1/13, effective 7/1/13.

Wash. Admin. Code § 51-54A-5707 Section 5707—On-demand mobile fueling operations.

5707.1 General. On-demand mobile fueling operations that dispense Class I, II and III liquids into the fuel tanks of motor vehicles shall comply with Sections 5707.1 through 5707.6.6.

| EXCEPTION: | Fueling from an approved portable container in cases of an emergency or for personal use. | | --- | --- |

5707.1.1 Approval required. Mobile fueling operations shall not be conducted without first obtaining a permit and approval from the fire code official. Mobile fueling operations shall occur only at approved locations. The fire code official is authorized to approve individual locations or geographic areas where mobile fueling is allowed.

5707.1.2 Coordination of permits.Permits across multiple authorities having jurisdiction shall be coordinated in accordance with Sections 5707.1.2.1 through 5707.1.2.4.

5707.1.2.1 Acceptance of permits issued by other authorities having jurisdiction. Local authorities having jurisdiction that allow mobile on demand fueling trucks may accept conforming permits issued and/or inspections performed by any other local authorities having jurisdiction in Washington state. Local authorities having jurisdiction that choose to accept conforming permits issued by other local authorities having jurisdiction in Washington state retain the right to enforce the provisions of this section.

5707.1.2.2 Local authorities having jurisdiction not offering operator or truck certification. A conforming operator or vehicle permit issued by one local authority having jurisdiction shall be recognized and accepted by all local authorities having jurisdiction in Washington state, if those local authority having jurisdictions allow mobile on-demand fueling and do not offer such operator or truck certification. Under no circumstances will an issuing local authority having jurisdiction be expected to perform permissive inspections beyond their jurisdiction.

5707.1.2.3 Commencing permit issuance. When a local authority having jurisdiction that has previously authorized mobile fueling operations but not issued their own permits commences permit issuance for mobile fueling operations or vehicles, that local authority having jurisdiction shall continue to accept permits previously issued by another local authority having jurisdiction in Washington state for three months or until their expiration date, whichever is sooner.

5707.1.2.4 Permit record maintenance. Issuing local authorities having jurisdiction shall maintain a publicly available list of current permits or other information source to enable all parties to have information about whether permits are in good standing.

5707.2 Mobile fueling vehicle. An on-demand mobile fueling vehicle shall be utilized in on-demand fueling operations for the dispensing of Class I, II or III liquids into the fuel tanks of motor vehicles and shall comply with Sections 5707.2.1 and 5707.2.2.

5707.2.1 Mobile fueling vehicle classifications. An on-demand mobile fueling vehicle shall be classified as one of the following:

1. Type 1Mobile Fueling Vehicle - A tank vehicle that complies with NFPA 385 and that has chassis-mounted tanks where the aggregate capacity does not exceed 1600 gallons (6057 L).

2. Type 2Mobile Fueling Vehicle - A vehicle with one or more chassis-mounted tanks or chassis-mounted containers, not to exceed 110 gallons (415 L) capacity for each tank or container and having an aggregate capacity not exceeding 800 gallons (3028 L) or the weight capacity of the vehicle in accordance with DOTn.

3. Type 3Mobile Fueling Vehicle - A vehicle that carries a maximum aggregate capacity of 60 gallons (227 L) of motor fuel in metal safety cans listed in accordance with UL 30 or other approved metal containers, each not to exceed 5 gallons (19 L) in capacity.

5707.2.2 Mobile fueling vehicle requirements. Each mobile fueling vehicle shall comply with all local, state and federal requirements, and the following:

1. Mobile fueling vehicles with a chassis-mounted tank in excess of 110 gallons (415 L) shall also comply with the requirements of Section 5706.6 and NFPA 385.

2. The mobile fueling vehicle and its equipment shall be maintained in good repair.

3. Safety cans and approved metal containers shall be secured to the mobile fueling vehicle except when in use.

4. Fueling a motor vehicle from tanks or containers mounted in a trailer connected to a mobile fueling vehicle shall be prohibited.

5707.3 Required documents. Documents developed to comply with Sections 5707.3.1 through 5707.3.3 shall be updated as necessary by the owner of the mobile fueling operation and shall be maintained in compliance with Section 108.3.

5707.3.1 Safety and emergency response plan. Mobile fueling operators shall have an approved written safety and emergency response plan that establishes policies and procedures for fire safety, spill prevention and control, personnel training and compliance with other applicable requirements of this code. The safety and emergency response plan shall specifically address and require that all operators assess surroundings prior to fueling to consider the presence of items listed in Section 5707.3.3.

5707.3.2 Training records. Mobile fueling vehicles shall be operated only by designated personnel who are trained on proper fueling procedures and the safety and emergency response plan. Training records of operators shall be maintained.

5707.3.3 Site plan. Where required by the fire code official, a site plan shall be developed for each location or area at which mobile fueling occurs. The site plan shall be in sufficient detail to indicate but not be limited to the following:

1. All buildings, structures.

2. Lot lines or property lines.

3. Electric car chargers.

4. Solar photovoltaic parking lot canopies.

5. Appurtenances on-site and their use or function.

6. All uses adjacent to the lot lines of the site.

7. Fueling locations.

8. Locations of all storm drain openings and adjacent waterways or wetlands.

9. Information regarding slope, natural drainage, curbing, and impounding.

10. How a spill will be kept on the site property.

11. Scale of the site plan.

5707.3.4 Tiered sites. Where a site permitting process is required by the local jurisdiction, a site shall be designated by the fire code official to be one of the following and based on local provisions as necessitated by zoning laws, environmental laws, public safety, and other characteristics.

5707.3.4.1 Tier 1 sites. Sites that do not present atypical geographic, safety or environmental concerns shall be provided expedited permitting review and shall allow permit issuance prior to site inspection. The fire code official may impose additional conditions and may perform a site inspection during the period of permit validity.

5707.3.4.2 Tier 2 sites. Sites that require an inspection shall be approved by the fire code official prior to permit issuance.

5707.4 Mobile fueling areas. During fueling, the mobile fueling vehicle and point of connection of the vehicle being fueled shall not be located on public streets, public ways or inside buildings. Fueling on the roof level of parking structures or other buildings is prohibited.

5707.4.1 Separation. During fueling, the point of connection of the vehicle being fueled shall not take place within 25 feet (7620 mm) of buildings, lot lines, property lines or combustible storage. Mobile fueling vehicles shall not park within 10 feet (3048 mm) of buildings, lot lines, property lines or combustible storage.

| EXCEPTIONS: | 1. The fire code official shall be authorized to decrease the separation distance for dispensing from metal safety cans or other approved metal containers in accordance with Section 5707.2. | | --- | --- | | | 2. The point of fueling shall not take place within 10 feet (3048 mm) of buildings, lot lines, property lines or combustible storage when the mobile fueling vehicle has an approved vapor recovery system or is servicing vehicles with on board refueling vapor recovery. |

Where dispensing operations occur within 15 feet (4572 mm) of a storm drain, an approved storm drain cover or an approved equivalent method that will prevent any fuel from reaching the drain shall be used.

5707.4.2 Sources of ignition. Smoking, open flames and other sources of ignition shall be prohibited within 25 feet (7620 mm) of fuel dispensing activities. Signs prohibiting smoking or open flames within 25 feet (7620 mm) of the vehicle or the point of fueling shall be prominently posted on the mobile fueling vehicle. The engines of vehicles being fueled shall be shut off during fueling.

5707.4.3 Electrical equipment. Mobile fueling shall not occur within 20 feet of electrical equipment located within 18 inches of the ground unless such electrical equipment is rated for Class 1, Division 2 hazardous locations in accordance with NFPA 70.

5707.5 Equipment. Mobile fueling equipment shall comply with Sections 5707.5.1 through 5707.5.5.

5707.5.1 Dispensing hoses and nozzles. Where equipped, the dispensing hose shall not exceed 50 feet (15240 mm) in length. The dispensing nozzles and hoses shall be of an approved and listed type. Where metal-to-metal contact cannot be made between the nozzle and the fuel fill opening, then a means for bonding the mobile fueling vehicle to the motor vehicle shall be provided and employed during fueling operations.

5707.5.2 Break-away device. A listed break-away device shall be provided at the nozzle.

| EXCEPTION: | Mobile fueling vehicles equipped with an approved brake interlock tied to the nozzle holder that prohibits movement of the mobile fueling vehicle when the nozzle is removed from its holder or tied to the delivery of fuel that prevents activation of the pumping system. | | --- | --- |

5707.5.3 Shut-off valve and fuel limit. Mobile fueling vehicles shall be equipped with a listed shut-off valve assembly and a fuel limit switch set to a maximum of 30 gallons (116 L).

5707.5.4 Fire extinguisher. An approved portable fire extinguisher complying with Section 906 with a minimum rating of 4A:80-B:C shall be provided on the mobile fueling vehicle with signage clearly indicating its location.

5707.5.5 Spill kit. Mobile fueling vehicles shall contain a minimum 5 gallon (19 L) spill kit of an approved type.

5707.6 Operations. Mobile fueling vehicles shall be constantly attended during fueling operations with brakes set and warning lights in operation. Mobile fueling vehicles shall not obstruct emergency vehicle access roads.

5707.6.1 Dispensing hose. Where equipped, mobile fueling vehicles shall be positioned in a manner to preclude traffic from driving over the dispensing hose. The dispensing hose shall be properly placed on an approved reel or in an approved compartment prior to moving the mobile fueling vehicle.

5707.6.2 Drip control. Operators shall place a drip pan or an absorbent pillow under the nozzle and each fuel fill opening prior to and during dispensing operations to catch drips.

5707.6.3 Safety cones. Safety cones or other visual barriers shall be employed as warning devices to highlight the vehicle fueling area. Signs prohibiting smoking or open flames within 25 feet (7620 mm) shall be prominently posted in the vehicle fueling area.

5707.6.4 Vehicle lights. The mobile fueling vehicle flasher lights shall be in operation while dispensing operations are in progress.

5707.6.5 Nighttime deliveries. Nighttime deliveries shall only be made in areas adequately lighted per WAC 296-800-21005.

5707.6.6 Spill reporting. Spills shall be reported in accordance with Section 5003.3.1.

History

• Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 23-23-106, § 51-54A-5707, filed 11/15/23, effective 3/16/24. Statutory Authority: RCW 19.27.077, 19.27.031 and 19.27.074. WSR 21-13-023, § 51-54A-5707, filed 6/9/21, effective 7/10/21.

Wash. Admin. Code § 51-54A-6108 Fire protection.

6108.1 General. Storage, handling and transportation of liquefied petroleum gas (LP-gas) and the installation of LP-gas equipment pertinent to systems for such uses shall comply with this chapter and NFPA 58. Properties of LP-gas shall be determined in accordance with Appendix B of NFPA 58.

| EXCEPTION: | The use and storage of listed propane fired barbeque grills on R-2 decks and balconies with an approved container not exceeding a water capacity of 20 pounds (9 kg) that maintain a minimum clearance of 18 inches on all sides, unless listed for lesser clearances. | | --- | --- |

History

• Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 20-01-162, § 51-54A-6108, filed 12/18/19, effective 7/1/20. Statutory Authority: RCW 19.27A.031, 19.27.074 and chapters 19.27 and 34.05 RCW. WSR 13-04-063, § 51-54A-6108, filed 2/1/13, effective 7/1/13.

Wash. Admin. Code § 51-54A-8000 Referenced standards.

NFPA 13-19: Standard for the Installation of Sprinkler Systems (except 9.3.6.3(5)) . . . .903.3.1.1,

903.3.2, 903.3.8.2, 903.3.8.5, 904.13, 905.3.4, 907.6.4, 914.3.2, 1019.3, 1103.4.8, 3201.1, 3204.2, 3205.5, Table 3206.2, 3206.4.1, 3206.10, 3207.2, 3207.2.1, 3208.2.2, 3208.2.2.1, 3208.4, 3210.1, 3401.1, 5104.1, 5104.1.1, 5106.5.7, 5704.3.3.9, Table 5704.3.6.3(7), 5704.3.7.5.1, 5704.3.8.4

NFPA 33-18 Membrane Enclosures . . . .2404.3.5

NFPA 96-21 Standard for Ventilation Control and Fire Protection of Commercial Cooking Operations . . . . 606.2,

606.3, 904.13

NFPA 130-20 Standard for Fixed Guideway Transit and Passenger Rail Systems . . . . 4901.1

NFPA 855-23 Standard for the Installation of Stationary Energy Storage Systems . . . . 1201.1

UL 142A-2018: Special Purpose Above ground Tanks for Specific Flammable or Combustible Liquids . . . .605.4

UL 2272-2016: Electrical Systems for Personal E-Mobility

Devices . . . .323.2

UL 2849-2020: Electrical Systems for eBikes . . . .323.2

History

• Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 23-22-119, § 51-54A-8000, filed 10/31/23, effective 3/15/24
• WSR 22-13-093, 23-12-107, and 23-20-027, § 51-54A-8000, filed 6/14/22, 6/7/23, and 9/25/23, effective 3/15/24. Statutory Authority: RCW 19.27.031, 19.27.074 and chapter 19.27 RCW. WSR 19-02-086, § 51-54A-8000, filed 1/2/19, effective 7/1/19. Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 16-03-055, § 51-54A-8000, filed 1/16/16, effective 7/1/16. Statutory Authority: RCW 19.27A.031, 19.27.074 and chapters 19.27 and 34.05 RCW. WSR 13-04-063, § 51-54A-8000, filed 2/1/13, effective 7/1/13.

Wash. Admin. Code § 51-54A-8100 Reserved.

History

• Statutory Authority: Chapter 19.27 RCW and RCW 19.27.031. WSR 17-10-028, § 51-54A-8100, filed 4/25/17, effective 5/26/17. Statutory Authority: RCW 19.27A.031, 19.27.074 and chapters 19.27 and 34.05 RCW. WSR 13-04-063, § 51-54A-8100, filed 2/1/13, effective 7/1/13.

Wash. Admin. Code § 51-54A-8200 Reserved.

History

• Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 22-13-093, 23-12-107, and 23-20-027, § 51-54A-8200, filed 6/14/22, 6/7/23, and 9/25/23, effective 3/15/24
• WSR 20-01-162, § 51-54A-8200, filed 12/18/19, effective 7/1/20. Statutory Authority: Chapter 19.27 RCW and RCW 19.27.031. WSR 17-10-028, § 51-54A-8200, filed 4/25/17, effective 5/26/17. Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 16-03-055, § 51-54A-8200, filed 1/16/16, effective 7/1/16.

Chapter 51-55 State Building Code adoption and amendment of the 2021 edition of the Wildland-Urban Interface Code.

Wash. Admin. Code § 51-55-001 Authority.

Reserved.

History

• Statutory Authority: RCW 19.27.031, 19.27.074, and 19.27.560. WSR 26-07-075, s 51-55-001, filed 3/17/26, effective 4/17/26
• WSR 23-02-056, 23-12-109, and 23-20-028, § 51-55-001, filed 1/3/23, 6/7/23, and 9/25/23, effective 3/15/24.

Wash. Admin. Code § 51-55-002 Purpose.

Reserved.

History

• Statutory Authority: RCW 19.27.031, 19.27.074, and 19.27.560. WSR 26-07-075, s 51-55-002, filed 3/17/26, effective 4/17/26
• WSR 23-02-056, 23-12-109, and 23-20-028, § 51-55-002, filed 1/3/23, 6/7/23, and 9/25/23, effective 3/15/24.

Wash. Admin. Code § 51-55-003 International Wildland-Urban Interface Code.

Reserved.

History

• Statutory Authority: RCW 19.27.031, 19.27.074, and 19.27.560. WSR 26-07-075, s 51-55-003, filed 3/17/26, effective 4/17/26
• WSR 23-02-056, 23-12-109, and 23-20-028, § 51-55-003, filed 1/3/23, 6/7/23, and 9/25/23, effective 3/15/24.

Wash. Admin. Code § 51-55-008 Implementation.

Reserved.

History

• Statutory Authority: RCW 19.27.031, 19.27.074, and 19.27.560. WSR 26-07-075, s 51-55-008, filed 3/17/26, effective 4/17/26. Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 23-23-107, § 51-55-008, filed 11/15/23, effective 3/16/24. Statutory Authority: RCW 19.27.031, 19.27.074, and 19.27.560. WSR 23-02-056, 23-12-109, and 23-20-028, § 51-55-008, filed 1/3/23, 6/7/23, and 9/25/23, effective 3/15/24.

Wash. Admin. Code § 51-55-0100 Scope and administration.

Reserved.

History

• Statutory Authority: RCW 19.27.031, 19.27.074, and 19.27.560. WSR 26-07-075, s 51-55-0100, filed 3/17/26, effective 4/17/26
• WSR 23-02-056, 23-12-109, and 23-20-028, § 51-55-0100, filed 1/3/23, 6/7/23, and 9/25/23, effective 3/15/24.

Wash. Admin. Code § 51-55-0200 Chapter 2—Definitions.

Reserved.

History

• Statutory Authority: RCW 19.27.031, 19.27.074, and 19.27.560. WSR 26-07-075, s 51-55-0200, filed 3/17/26, effective 4/17/26
• WSR 23-02-056, 23-12-109, and 23-20-028, § 51-55-0200, filed 1/3/23, 6/7/23, and 9/25/23, effective 3/15/24

Wash. Admin. Code § 51-55-0300 Wildland-urban interface areas.

Reserved.

History

• Statutory Authority: RCW 19.27.031, 19.27.074, and 19.27.560. WSR 26-07-075, s 51-55-0300, filed 3/17/26, effective 4/17/26. Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 23-23-107, § 51-55-0300, filed 11/15/23, effective 3/16/24. Statutory Authority: RCW 19.27.031, 19.27.074, and 19.27.560. WSR 23-02-056, 23-12-109, and 23-20-028, § 51-55-0300, filed 1/3/23, 6/7/23, and 9/25/23, effective 3/15/24.

Wash. Admin. Code § 51-55-0400 Wildland-urban interface area requirements.

Reserved.

History

• Statutory Authority: RCW 19.27.031, 19.27.074, and 19.27.560. WSR 26-07-075, s 51-55-0400, filed 3/17/26, effective 4/17/26
• WSR 23-02-056, 23-12-109, and 23-20-028, § 51-55-0400, filed 1/3/23, 6/7/23, and 9/25/23, effective 3/15/24.

Wash. Admin. Code § 51-55-0500 Special building construction regulations.

Reserved.

History

• Statutory Authority: RCW 19.27.031, 19.27.074, and 19.27.560. WSR 26-07-075, s 51-55-0500, filed 3/17/26, effective 4/17/26. Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 23-23-107, § 51-55-0500, filed 11/15/23, effective 3/16/24. Statutory Authority: RCW 19.27.031, 19.27.074, and 19.27.560. WSR 23-02-056, 23-12-109, and 23-20-028, § 51-55-0500, filed 1/3/23, 6/7/23, and 9/25/23, effective 3/15/24.

Wash. Admin. Code § 51-55-0600 Fire protection requirements.

Reserved.

History

• Statutory Authority: RCW 19.27.031, 19.27.074, and 19.27.560. WSR 26-07-075, s 51-55-0600, filed 3/17/26, effective 4/17/26
• WSR 23-02-056, 23-12-109, and 23-20-028, § 51-55-0600, filed 1/3/23, 6/7/23, and 9/25/23, effective 3/15/24.

Wash. Admin. Code § 51-55-0700 Chapter 7—Vegetation management plan.

Reserved.

History

• Statutory Authority: RCW 19.27.031, 19.27.074, and 19.27.560. WSR 26-07-075, s 51-55-0700, filed 3/17/26, effective 4/17/26
• WSR 23-02-056, 23-12-109, and 23-20-028, § 51-55-0700, filed 1/3/23, 6/7/23, and 9/25/23, effective 3/15/24.

Wash. Admin. Code § 51-55-0800 Chapter 8—Fire hazard severity form.

Reserved.

History

• Statutory Authority: RCW 19.27.031, 19.27.074, and 19.27.560. WSR 26-07-075, s 51-55-0800, filed 3/17/26, effective 4/17/26
• WSR 23-02-056, 23-12-109, and 23-20-028, § 51-55-0800, filed 1/3/23, 6/7/23, and 9/25/23, effective 3/15/24.

Wash. Admin. Code § 51-55-0900 Chapter 9—Fire danger rating system.

Reserved.

History

• Statutory Authority: RCW 19.27.031, 19.27.074, and 19.27.560. WSR 26-07-075, s 51-55-0900, filed 3/17/26, effective 4/17/26
• WSR 23-02-056, 23-12-109, and 23-20-028, § 51-55-0900, filed 1/3/23, 6/7/23, and 9/25/23, effective 3/15/24.

Wash. Admin. Code § 51-55-1000 Chapter 10—Referenced standards.

Reserved.

History

• Statutory Authority: RCW 19.27.031, 19.27.074, and 19.27.560. WSR 26-07-075, s 51-55-1000, filed 3/17/26, effective 4/17/26
• WSR 23-02-056, 23-12-109, and 23-20-028, § 51-55-1000, filed 1/3/23, 6/7/23, and 9/25/23, effective 3/15/24.

Chapter 51-56 State Building Code adoption and amendment of the 2021 edition of the Uniform Plumbing Code.

Wash. Admin. Code § 51-56-001 Authority.

These rules are adopted under the authority of chapter 19.27 RCW.

History

• Statutory Authority: RCW 19.27.031, 19.27.074. WSR 02-01-114, § 51-56-001, filed 12/18/01, effective 7/1/02.

Wash. Admin. Code § 51-56-002 Purpose.

The purpose of these rules is to implement the provisions of chapter 19.27 RCW, which provides that the state building code council shall maintain the State Building Code in a status which is consistent with the purpose as set forth in RCW 19.27.020. In maintaining the codes, the council shall regularly review updated versions of the codes adopted under the act, and other pertinent information, and shall amend the codes as deemed appropriate by the council.

History

• Statutory Authority: RCW 19.27.031, 19.27.074. WSR 02-01-114, § 51-56-002, filed 12/18/01, effective 7/1/02.

Wash. Admin. Code § 51-56-003 Uniform Plumbing Code.

The 2021 edition of the Uniform Plumbing Code, including Appendices A, B, I, and M, published by the International Association of Plumbing and Mechanical Officials, is hereby adopted by reference with the following additions, deletions and exceptions: Provided that chapters 12 and 14 of this code are not adopted. Provided further, that those requirements of the Uniform Plumbing Code relating to venting and combustion air of fuel fired appliances as found in chapter 5 and those portions of the code addressing building sewers are not adopted.

History

• Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 23-02-057, 23-12-110, and 23-20-029, § 51-56-003, filed 1/3/23, 6/7/23, and 9/25/23, effective 3/15/24
• WSR 20-02-072, § 51-56-003, filed 12/26/19, effective 7/1/20
• WSR 16-02-044, § 51-56-003, filed 12/30/15, effective 7/1/16. Statutory Authority: RCW 19.27.074, 19.27.031 and chapters 19.27 and 34.05 RCW. WSR 13-04-054, § 51-56-003, filed 2/1/13, effective 7/1/13
• WSR 10-03-101, § 51-56-003, filed 1/20/10, effective 7/1/10. Statutory Authority: RCW 19.27.190, 19.27.020 and chapters 19.27 and 34.05 RCW. WSR 07-01-094, § 51-56-003, filed 12/19/06, effective 7/1/07. Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 04-01-110, § 51-56-003, filed 12/17/03, effective 7/1/04
• WSR 02-01-114, § 51-56-003, filed 12/18/01, effective 7/1/02.

Wash. Admin. Code § 51-56-004 Conflicts between Appendix I and the manufacturer's installation instructions.

Where a conflict exists between the provisions of Appendix I and the manufacturer's installation instructions, the conditions of the listing and the manufacturer's installation instructions shall apply.

History

• Statutory Authority: RCW 19.27.074, 19.27.031 and chapters 19.27 and 34.05 RCW. WSR 13-04-054, § 51-56-004, filed 2/1/13, effective 7/1/13.

Wash. Admin. Code § 51-56-007 Exceptions.

The exceptions and amendments to the model codes contained in the provisions of chapter 19.27 RCW shall apply in cases of conflict with any of the provisions of these rules.

Codes referenced which are not adopted through RCW 19.27.031 or chapter 19.27A RCW shall not apply unless specifically adopted by the authority having jurisdiction.

History

• Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 04-01-110, § 51-56-007, filed 12/17/03, effective 7/1/04
• WSR 02-01-114, § 51-56-007, filed 12/18/01, effective 7/1/02.

Wash. Admin. Code § 51-56-008 Implementation.

The Uniform Plumbing Code adopted by chapter 51-56 WAC shall become effective in all counties and cities of this state on March 15, 2024.

History

• Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 23-23-108, § 51-56-008, filed 11/15/23, effective 3/15/24
• WSR 23-02-057, 23-12-110, and 23-20-029, § 51-56-008, filed 1/3/23, 6/7/23, and 9/25/23, effective 3/15/24
• WSR 21-11-066, § 51-56-008, filed 5/14/21, effective 6/14/21
• WSR 20-02-072, § 51-56-008, filed 12/26/19, effective 7/1/20
• WSR 16-02-044, § 51-56-008, filed 12/30/15, effective 7/1/16. Statutory Authority: RCW 19.27.074 and 19.27.031 and chapters 19.27 and 34.05 RCW. WSR 13-04-054, § 51-56-008, filed 2/1/13, effective 7/1/13
• WSR 10-03-101, § 51-56-008, filed 1/20/10, effective 7/1/10. Statutory Authority: RCW 19.27.190, 19.27.020 and chapters 19.27 and 34.05 RCW. WSR 07-01-094, § 51-56-008, filed 12/19/06, effective 7/1/07. Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 04-01-110, § 51-56-008, filed 12/17/03, effective 7/1/04
• WSR 02-01-114, § 51-56-008, filed 12/18/01, effective 7/1/02.

Wash. Admin. Code § 51-56-0100 Chapter 1—Administration.

102.1 Conflict Between Codes. Delete paragraph.

103.3.1 Certification. State rules and regulations concerning certification shall apply.

History

• Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 16-02-044, § 51-56-0100, filed 12/30/15, effective 7/1/16. Statutory Authority: RCW 19.27.074, 19.27.031 and chapters 19.27 and 34.05 RCW. WSR 13-04-054, § 51-56-0100, filed 2/1/13, effective 7/1/13. Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 04-01-110, § 51-56-0100, filed 12/17/03, effective 7/1/04
• WSR 02-01-114, § 51-56-0100, filed 12/18/01, effective 7/1/02.

Wash. Admin. Code § 51-56-0200 Chapter 2—Definitions.

205.0 Certified Backflow Assembly Tester - A person certified by the Washington state department of health under chapter 246-292 WAC to inspect (for correct installation and approval status) and test (for proper operation), maintain and repair (in compliance with chapter 18.106 RCW) backflow prevention assemblies, devices and air gaps.

210.0 Hot Water - Water at a temperature exceeding or equal to 100°F.

218.0 Plumbing System - Includes all potable water, building supply and distribution pipes, all reclaimed or other alternate source water systems, all rainwater systems, all plumbing fixtures and traps, all drainage and vent pipe(s), and all building drains including their respective joints and connection, devices, receptors, and appurtenances within the property lines of the premises and shall include potable water piping, potable water treating or using equipment, medical gas and medical vacuum systems, and water heaters: Provided, That no certification shall be required for the installation of a plumbing system within the property lines and outside a building.

221.0 Spray Sprinkler Body - The exterior case or shell of a sprinkler incorporating a means of connection to the piping system designed to convey water to a nozzle or orifice.

225.0 Water Heater (consumer electric storage) - A consumer product that uses electricity as the energy source to heat domestic potable water, has a nameplate input rating of twelve kilowatts or less, contains nominally forty gallons but no more than one hundred twenty gallons of rated hot water storage volume, and supplies a maximum hot water delivery temperature less than one hundred eighty degrees Fahrenheit.

Water Heater (mini-tank electric) - A small electric water heater that has a measured storage volume of more than one gallon and a rated storage volume of less than twenty gallons.

Water/Wastewater Utility - A public or private entity, including a water purveyor as defined in chapter 246-290 WAC, which may treat, deliver, or do both functions to reclaimed (recycled) water, potable water, or both to wholesale or retail customers.

History

• Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 23-02-057, 23-12-110, and 23-20-029, § 51-56-0200, filed 1/3/23, 6/7/23, and 9/25/23, effective 3/15/24
• WSR 20-02-072, § 51-56-0200, filed 12/26/19, effective 7/1/20
• WSR 16-02-044, § 51-56-0200, filed 12/30/15, effective 7/1/16. Statutory Authority: RCW 19.27A.025, 19.27A.045, and 19.27.074. WSR 13-23-094, § 51-56-0200, filed 11/20/13, effective 4/1/14. Statutory Authority: RCW 19.27.074, 19.27.031 and chapters 19.27 and 34.05 RCW. WSR 13-04-054, § 51-56-0200, filed 2/1/13, effective 7/1/13
• WSR 10-03-101, § 51-56-0200, filed 1/20/10, effective 7/1/10. Statutory Authority: RCW 19.27.190, 19.27.020 and chapters 19.27 and 34.05 RCW. WSR 07-01-094, § 51-56-0200, filed 12/19/06, effective 7/1/07. Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 04-01-110, § 51-56-0200, filed 12/17/03, effective 7/1/04
• WSR 02-01-114, § 51-56-0200, filed 12/18/01, effective 7/1/02.

Wash. Admin. Code § 51-56-0300 Chapter 3—General regulations.

301.2.2 Standards. Standards listed or referred to in this chapter or other chapters cover materials which will conform to the requirements of this code, when used in accordance with the limitations imposed in this or other chapters thereof and their listing. Where a standard covers materials of various grades, weights, quality, or configurations, the portion of the listed standard that is applicable shall be used. Design and materials for special conditions or materials not provided for herein shall be permitted to be used by special permission of the authority having jurisdiction after the authority having jurisdiction has been satisfied as to their adequacy in accordance with Section 301.2.

310.4 Use of Vent and Waste Pipes. Except as hereinafter provided in Sections 908.0 through 911.0 and Appendix C, no vent pipe shall be used as a soil or waste pipe, nor shall any soil or waste pipe be used as a vent.

312.6 Freezing Protection. No water, soil, or waste pipe shall be installed or permitted outside of a building, in attics or crawl spaces, or in an exterior wall unless, where necessary, adequate provision is made to protect such pipe from freezing. All hot and cold water pipes installed outside the conditioned space shall be insulated to meet the minimum requirements of the Washington State Energy Code.

312.7 Fire-Resistant Construction. All pipe penetrating floor/ceiling assemblies and fire-resistance rated walls or partitions shall be protected in accordance with the requirements of the building code.

History

• Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 23-02-057, 23-12-110, and 23-20-029, § 51-56-0300, filed 1/3/23, 6/7/23, and 9/25/23, effective 3/15/24
• WSR 16-02-044, § 51-56-0300, filed 12/30/15, effective 7/1/16. Statutory Authority: RCW 19.27.074, 19.27.031 and chapters 19.27 and 34.05 RCW. WSR 13-04-054, § 51-56-0300, filed 2/1/13, effective 7/1/13
• WSR 10-03-101, § 51-56-0300, filed 1/20/10, effective 7/1/10. Statutory Authority: RCW 19.27.190, 19.27.020 and chapters 19.27 and 34.05 RCW. WSR 07-01-094, § 51-56-0300, filed 12/19/06, effective 7/1/07. Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 04-01-110, § 51-56-0300, filed 12/17/03, effective 7/1/04
• WSR 02-01-114, § 51-56-0300, filed 12/18/01, effective 7/1/02.

Wash. Admin. Code § 51-56-0400 Chapter 4—Plumbing fixtures and fixture fittings.

402.5 Setting. Fixtures shall be set level and in proper alignment with reference to adjacent walls. No water closet or bidet shall be set closer than fifteen (15) inches (381 mm) from its center to any side wall or obstruction nor closer than thirty (30) inches (762 mm) center to center to any similar fixture. The clear space in front of any water closet or bidet shall be not less than twenty-four (24) inches (610 mm). No urinal shall be set closer than twelve (12) inches (305 mm) from its center to any side wall or partition nor closer than twenty-four (24) inches (610 mm) center to center.

| EXCEPTIONS: | 1. The clear space in front of a water closet, lavatory or bidet in dwelling units and sleeping units shall be not less than 21 inches (533 mm). | | --- | --- | | | 2. The installation of paper dispensers or accessibility grab bars shall not be considered obstructions. |

405.4 Application. No individual, public or private corporation, firm, political subdivision, government agency, or other legal entity, may, for purposes of use in the state of Washington, distribute, sell, offer for sale, import, install, or approve for installation any plumbing fixtures or fittings unless the fixtures or fittings meet the standards as provided for in this chapter.

407.1 Application. Lavatories shall comply with ASME A112.19.1/CSA B45.2, ASME A112.19.2/CSA B45.1, ASME A112.19.3/CSA B45.4, ASME A112.19.12, CSA B45.5/IAPMO Z124, CSA B45.8/IAPMO Z403, CSA B45.11/IAPMO Z401 or CSA B45.12/IAPMO Z402. Group wash fixtures shall comply with the requirements of Section 401.2. Every 20 inches (508 mm) of rim space of a group wash fixture shall be considered as one lavatory for determining the number of lavatories required in accordance with the International Building Code Table 2902.1.

Lavatory assemblies with automatic soap dispensers, faucets, or hand dryers shall comply with IAPMO IGC 127.

407.2 Water Consumption. The maximum water flow rate of faucets shall comply with Section 407.2.1 through 407.2.2.

407.2.1 Maximum Flow Rate. The maximum flow rate for public lavatory faucets shall not exceed 0.5 gpm at 60 psi (1.9 L/m at 414 kPa).

407.2.1.1 Residential Lavatory Faucets. The maximum flow rate of residential lavatory faucets shall not exceed 1.2 gallons (4.54 L) per minute at 60 psi. The minimum flow rate of residential lavatory faucets shall not be less than 0.8 gallons (3.03 L) per minute at 20 psi.

407.2.1.2 Lavatory Faucets in Common and Public Use Areas. The maximum flow rate of lavatory faucets, installed in common and public use areas (outside of dwellings or sleeping units) in residential buildings, shall not exceed 0.5 gallons (1.89 L) per minute at 60 psi.

407.2.2 Metering Faucets. Metered faucets shall deliver a maximum of 0.25 gallons (1.0 L) per metering cycle in accordance with ASME A112.18.1/CSA B125.1.

407.4 Metering Valves. Lavatory faucets located in restrooms intended for use by the general public shall be equipped with a metering valve designed to close by spring or water pressure when left unattended (self-closing).

| EXCEPTIONS: | 1. Where designed and installed for use by persons with a disability. | | --- | --- | | | 2. Where installed in day care centers, for use primarily by children under 6 years of age. |

408.2 Water Consumption. Showerheads shall meet the maximum flow rate of 1.8 gallons (6.81 L) per minute measured at 80 psi. Showerheads shall be certified to the performance criteria of the U.S. EPA WaterSense Specification for Showerheads.

| EXCEPTION: | Emergency use showers shall be exempt from the maximum water usage rates. | | --- | --- |

408.2.1 Multiple Showerheads Serving One Shower. When a shower is served by more than one showerhead, including handheld showerheads, the combined flow rate of all showerheads and/or other shower outlets controlled by a single valve shall not exceed 1.8 gallons (6.81 L) per minute at 80 psi, or the shower shall be designed to allow only one shower outlet to be in operation at a time.

408.4 Waste Outlet. Showers shall have a waste outlet and fixture tailpiece not less than two (2) inches (50 mm) in diameter. Fixture tailpieces shall be constructed from the materials specified in Section 701.2 for drainage piping. Strainers serving shower drains shall have a waterway at least equivalent to the area of the tailpiece.

| EXCEPTION: | In a residential dwelling unit where a 2 inch waste is not readily available and approval of the AHJ has been granted, the waste outlet, fixture tailpiece, trap and trap arm may be 1-1/2 inch when an existing tub is being replaced by a shower sized per Section 408.2. This exception only applies where one shower head rated at 1.8 gpm is installed. | | --- | --- |

408.6 Shower Compartments. Shower compartments, regardless of shape, shall have a minimum finished interior of nine hundred (900) square inches (0.58 m2) and shall also be capable of encompassing a thirty (30) inch (762 mm) circle. The minimum required area and dimensions shall be measured at a height equal to the top of the threshold and at a point tangent to its centerline. The area and dimensions shall be maintained to a point of not less than seventy (70) inches (1,778 mm) above the shower drain outlet with no protrusions other than the fixture valve or valves, shower head, soap dishes, shelves, and safety grab bars or rails. Fold-down seats in accessible shower stalls shall be permitted to protrude into the thirty (30) inch (762 mm) circle.

| EXCEPTIONS: | 1. Showers that are designed to comply with ICC/ANSI A117.1. | | --- | --- | | | 2. The minimum required area and dimension shall not apply for a shower receptor having overall dimensions of not less than thirty (30) inches (762 mm) in width and sixty (60) inches (1,524 mm) in length. |

411.2 Water Consumption. The effective flush volume of all water closets shall not exceed 1.28 gallons (4.8 L) per flush when tested in accordance with ASME A112.19.2/CSA B45.1.

| EXCEPTIONS: | 1. Water closets located in day care centers, intended for use by young children may have a maximum water use of 3.5 gallons per flush or 13.25 liters per flush. | | --- | --- | | | 2. Water closets with bed pan washers may have a maximum water use of 3.5 gallons per flush or 13.25 liters per flush. | | | 3. Blow out bowls, as defined in ANSI/ASME A112.19.2M, Section 5.1.2.3 may have a maximum water use of 3.5 gallons per flush or 13.25 liters per flush. |

411.2.2 Performance. Water closets installed shall meet or exceed the minimum performance criteria developed for certification of high-efficiency toilets under the WaterSense program sponsored by the U.S. Environmental Protection Agency (EPA).

411.2.3 Flushometer Valve Activated Water Closets. Flushometer valve activated water closets shall have a maximum flush volume of 1.28 gallons (4.8 Lpf) of water per flush in accordance with ASME A112.19.2/CSA B45.1.

412.1 Application. Urinals shall comply with ASME A112.19.2/CSA B45.1, ASME A112.19.19, or CSA B45.5/IAPMO Z124. Wall-mounted urinals shall have an average water consumption not to exceed 0.125 gallons (0.47 L) per flush. Other urinals shall have an average water consumption not to exceed 0.5 gallons (1.89 L) per flush.

414.3 Drainage Connection. Domestic dishwashing machines shall discharge indirectly through an air gap fitting in accordance with Section 807.3 into a waste receptor, a wye branch fitting on the tailpiece of a kitchen sink, or dishwasher connection of a food waste disposer. Commercial dishwashing machines shall discharge indirectly through an air gap.

415.2 Drinking Fountain Alternatives. This section is not adopted. See Building Code chapter 29.

418.3 Location of Floor Drains. Floor drains shall be installed in the following areas:

1. Toilet rooms containing two (2) or more water closets or a combination of one (1) water closet and one (1) urinal, except in a dwelling unit. The floor shall slope toward the floor drains.

2. Laundry rooms in commercial buildings and common laundry facilities in multifamily dwelling buildings.

420.0 Sinks

420.2 Water Consumption. Sink faucets shall have a maximum flow rate of not more than 2.2 gpm at 60 psi (8.3 L/m at 414 kPa) in accordance with ASME A112.18.1/CSA B125.1.

| EXCEPTION: | Clinical sinks, laundry trays, service sinks. | | --- | --- |

420.2.1 Kitchen Faucets. Kitchen faucets shall have a maximum flow rate of not more than 1.8 gallons (6.81 L) per minute at 60 psi. Kitchen faucets may temporarily increase the flow above the maximum rate, but not to exceed 2.2 gallons (8.3 L) per minute at 60 psi, and must default to a maximum flow rate of 1.8 gallons (6.81 L) per minute at 60 psi.

| EXCEPTION: | Where faucets meeting the maximum flow rate of 1.8 gpm (6.81 L) are unavailable, aerators or other means may be used to achieve reduction. | | --- | --- |

420.3 Prerinse Spray Valve. Commercial food service prerinse spray valves shall have a maximum flow rate of 1.6 gallons per minute (gpm) at 60 pounds-force per square inch (psi) (6.0 L/m at 414 kPa) in accordance with ASME A112.18.1/CSA B125.1 and shall be equipped with an integral automatic shutoff.

422.0 Minimum Number of Required Fixtures. For minimum number of plumbing fixtures required, see Building Code Chapter 29 and Table 2902.1.

423.0 Landscape Irrigation.

423.1 Spray Sprinkler Body. Spray sprinkler bodies must include an integral pressure regulator and must meet the water efficiency and performance criteria and other requirements of environmental protection agency water sense program product specification for spray sprinkler bodies.

| EXCEPTION: | Spray sprinkler bodies specifically excluded from the scope of the environmental protection agency water sense program product specification for spray sprinkler bodies. | | --- | --- |

Sections 422.1 through 422.5 and Table 422.1 are not adopted.

History

• Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 23-23-108, § 51-56-0400, filed 11/15/23, effective 3/15/24
• WSR 23-02-057, 23-12-110, and 23-20-029, § 51-56-0400, filed 1/3/23, 6/7/23, and 9/25/23, effective 3/15/24. Statutory Authority: RCW 19.27.035 and 19.27.074. WSR 21-01-125, § 51-56-0400, filed 12/15/20, effective 1/15/21. Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 20-02-072, § 51-56-0400, filed 12/26/19, effective 7/1/20
• WSR 17-10-074, § 51-56-0400, filed 5/3/17, effective 6/3/17
• WSR 16-02-044, § 51-56-0400, filed 12/30/15, effective 7/1/16. Statutory Authority: RCW 19.27.074, 19.27.031 and chapters 19.27 and 34.05 RCW. WSR 13-04-054, § 51-56-0400, filed 2/1/13, effective 7/1/13
• WSR 10-03-101, § 51-56-0400, filed 1/20/10, effective 7/1/10. Statutory Authority: RCW 19.27.190, 19.27.020 and chapters 19.27 and 34.05 RCW. WSR 07-01-094, § 51-56-0400, filed 12/19/06, effective 7/1/07. Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 04-01-110, § 51-56-0400, filed 12/17/03, effective 7/1/04
• WSR 02-01-114, § 51-56-0400, filed 12/18/01, effective 7/1/02.

Wash. Admin. Code § 51-56-0500 Chapter 5—Water heaters.

501.1 Applicability. The regulations of this chapter shall govern the construction, location, and installation of fuel burning and other types of water heaters heating potable water. The minimum capacity for water heaters shall be in accordance with the first hour rating listed in Table 501.1(2). See the Mechanical Code for combustion air and installation of all vents and their connectors. No water heater shall be hereinafter installed that does not comply with the manufacturer's installation instructions and the type and model of each size thereof approved by the authority having jurisdiction. A list of accepted water heater appliance standards is referenced in Table 501.1(1). Listed appliances shall be installed in accordance with the manufacturer's installation instructions. Unlisted water heaters shall be permitted in accordance with Section 504.3.2.

TABLE 501.1(2)1,3

| Number of Bathrooms | 1 to 1.5 | 2 to 2.5 | 3 to 3.5 | | | | | | | | | | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | | Number of Bedrooms | 1 | 2 | 3 | 2 | 3 | 4 | 5 | 3 | 4 | 5 | 6 | | First Hour Rating2, Gallons | 38 | 49 | 49 | 49 | 62 | 62 | 74 | 62 | 74 | 74 | 74 |

| Notes: | 1The first hour rating is found on the "Energy Guide" label. | | --- | --- | | | 2Nonstorage and solar water heaters shall be sized to meet the appropriate first hour rating as shown in the table, and shall be capable of delivering hot water at the maximum system demand flow, as calculated in Section 610.0 or Appendix A, as applicable. | | | 3For replacement water heaters, see Section 102.4. |

501.1.2 Consumer Electric Storage Water Heater Requirements. Consumer electric storage water heaters must have a modular demand response communications port compliant with the March 2018 version of the ANSI/CTA–2045-A communication interface standard, or equivalent and the March 2018 version of the ANSI/CTA-2045-A application layer requirements. The interface standard and application layer requirements required in this subsection are the versions established on March 16, 2018.

| EXCEPTIONS: | 1. Water heaters manufactured prior to January 1, 2021. | | --- | --- | | | 2. Electric storage water heaters other than heat pump type water heaters manufactured prior to January 1, 2022. |

501.1.3 Mini-tank Electric Water Heaters. The standby energy consumption of hot water dispensers and mini-tank electric water heaters manufactured on or after January 1, 2010, shall be not greater than 35 watts. Mini-tank electric water heaters shall be tested in accordance with the method specified in the California Code of 39 Regulations, Title 20, section 1604 in effect as of July 26, 2009.

504.1 Location. Water heater installation in bedrooms and bathrooms shall comply with one of the following:

(1) Fuel-burning water heaters may be installed in a closet located in the bedroom or bathroom provided the closet is equipped with a listed, gasketed door assembly and a listed self-closing device. The self-closing door assembly shall meet the requirements of Section 504.1.1. The door assembly shall be installed with a threshold and bottom door seal and shall meet the requirements of Section 504.1.2. All combustion air for such installations shall be obtained from the outdoors in accordance with the International Mechanical Code. The closet shall be for the exclusive use of the water heater.

(2) Water heater shall be of the direct vent type.

505.2 Safety Devices. All storage-type water heaters deriving heat from fuels or types of energy other than gas, shall be provided with, in addition to the primary temperature controls, an over-temperature safety protection device constructed, listed, and installed in accordance with nationally recognized applicable standards for such devices and a combination temperature and pressure relief valve.

506.0 Combustion Air. For issues relating to combustion air, see the Mechanical Code.

Sections 506.1 through 506.9 are not adopted.

Sections 507.6 through 507.9 are not adopted.

507.2 Seismic Provisions. Water heaters shall be anchored or strapped to resist horizontal displacement due to earthquake motion. Strappings shall be at points within the upper one-third and lower one-third of its vertical dimensions. At the lower point, a distance of not less than four (4) inches (102 mm) shall be maintained from the controls to the strapping.

507.13 Installation in Garages. Appliances in garages and in adjacent spaces that open to the garage and are not part of the living space of a dwelling unit shall be installed so that burners, burner-ignition devices and ignition sources are located not less than eighteen (18) inches above the floor unless listed as flammable vapor ignition resistant.

507.16 Venting of Flue Gases - Delete entire section.

Sections 507.18 through 507.22 are not adopted.

509.0 Venting of Equipment. Delete entire section.

510.0 Sizing of Category I Venting Systems. Delete entire section.

History

• Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 23-23-108, § 51-56-0500, filed 11/15/23, effective 3/15/24
• WSR 23-02-057, 23-12-110, and 23-20-029, § 51-56-0500, filed 1/3/23, 6/7/23, and 9/25/23, effective 3/15/24. Statutory Authority: RCW 19.27.035 and 19.27.074. WSR 21-01-125, § 51-56-0500, filed 12/15/20, effective 1/15/21. Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 20-02-072, § 51-56-0500, filed 12/26/19, effective 7/1/20
• WSR 17-10-074, § 51-56-0500, filed 5/3/17, effective 6/3/17
• WSR 16-02-044, § 51-56-0500, filed 12/30/15, effective 7/1/16. Statutory Authority: RCW 19.27.074, 19.27.031 and chapters 19.27 and 34.05 RCW. WSR 13-04-054, § 51-56-0500, filed 2/1/13, effective 7/1/13
• WSR 11-05-037, § 51-56-0500, filed 2/8/11, effective 7/1/13
• WSR 10-03-101, § 51-56-0500, filed 1/20/10, effective 7/1/10. Statutory Authority: RCW 19.27.190, 19.27.020 and chapters 19.27 and 34.05 RCW. WSR 07-01-094, § 51-56-0500, filed 12/19/06, effective 7/1/07. Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 04-01-110, § 51-56-0500, filed 12/17/03, effective 7/1/04
• WSR 02-01-114, § 51-56-0500, filed 12/18/01, effective 7/1/02.

Wash. Admin. Code § 51-56-0600 Chapter 6—Water supply and distribution.

601.1 Applicability. This chapter shall govern the materials, design and installation of water supply systems, including backflow prevention devices, assemblies and methods used for backflow prevention.

603.1 General. Cross-connection control shall be provided in accordance with the provisions of this chapter. Devices or assemblies for protection of the public water system must be models approved by the department of health under WAC 246-290-490. The authority having jurisdiction shall coordinate with the local water purveyor where applicable in all matters concerning cross-connection control within the property lines of the premises.

No person shall install any water operated equipment or mechanism, or use any water treating chemical or substance, if it is found that such equipment, mechanism, chemical or substance may cause pollution or contamination of the domestic water supply. Such equipment or mechanism may be permitted only when equipped with an approved backflow prevention device or assembly.

603.2 Approval of Devices or Assemblies. Before any device or assembly is installed for the prevention of backflow, it shall have first been approved by the authority having jurisdiction. Devices or assemblies shall be tested for conformity with recognized standards or other standards acceptable to the authority having jurisdiction. Backflow prevention devices and assemblies shall comply with Table 603.2, except for specific applications and provisions as stated in Section 603.5.1 through 603.5.21.

All devices or assemblies installed in a potable water supply system for protection against backflow shall be maintained in good working condition by the person or persons having control of such devices or assemblies. Such devices or assemblies shall be tested in accordance with Section 603.4.2 and WAC 246-290-490. If found to be defective or inoperative, the device or assembly shall be replaced or repaired. No device or assembly shall be removed from use or relocated or other device or assembly substituted, without the approval of the authority having jurisdiction.

Testing shall be performed by a Washington state department of health certified backflow assembly tester.

TABLE 603.2

Backflow Prevention Devices, Assemblies and Methods

The following line is deleted from the table:

| Device, Assembly or Method | Applicable Standards | Pollution (Low Hazard) | Contamination (High Hazard) | Installation | | | | --- | --- | --- | --- | --- | --- | --- | | Back Siphonage | Back Pressure | Back Siphonage | Back Pressure | | | | | Backflow preventer for carbonated beverage dispensers (two independent check valves with a vent to the atmosphere.) | ASSE 1022 | X | | | | Installation includes carbonated beverage machines or dispensers. These devices operate under intermittent or continuous pressure conditions. |

603.4.2 Testing. For devices and assemblies other than those regulated by the Washington department of health in conjunction with the local water purveyor for the protection of public water systems, the authority having jurisdiction shall ensure that the premise owner or responsible person shall have the backflow prevention assembly tested by a Washington state department of health certified backflow assembly tester:

(1) At the time of installation, repair or relocation; and

(2) At least on an annual schedule thereafter, unless more frequent testing is required by the authority having jurisdiction.

603.5.6 Protection from Lawn Sprinklers and Irrigation Systems. Potable water supplies to systems having no pumps or connections for pumping equipment, and no chemical injection or provisions for chemical injection, shall be protected from backflow by one of the following:

(1) Atmospheric vacuum breaker (AVB).

(2) Pressure vacuum breaker backflow prevention assembly (PVB).

(3) Spill-resistant pressure vacuum breaker (SVB).

(4) Reduced pressure principle backflow prevention assembly (RP).

(5) A double check valve backflow prevention assembly (DC) may be allowed when approved by the water purveyor and the authority having jurisdiction.

603.5.10 Steam or Hot Water Boilers. Potable water connections to steam or hot water boilers shall be protected by an air gap or a reduced pressure principle backflow preventer.

603.5.12 Beverage Dispensers. Potable water supply to carbonators shall be protected by a listed reduced pressure principle backflow preventer as approved by the authority having jurisdiction for the specific use. The backflow preventer shall comply with Section 603.4.3. The piping downstream of the backflow preventer shall not be of copper, copper alloy, or other material that is affected by carbon dioxide.

604.14Plastic Pipe Termination. Plastic water service piping may terminate within a building, provided the connection to the potable water distribution system shall be made as near as is practical to the point of entry and shall be accessible. Barbed insert fittings with hose clamps are prohibited as a transition fitting within the building.

608.5Discharge Piping. The discharge piping serving a temperature relief valve, pressure relief valve or combination of both shall have no valves, obstructions or means of isolation and be provided with the following:

(1) Not less than the size of the valve outlet and shall discharge full size to the flood level of the area receiving the discharge and pointing down.

(2) Materials shall be rated at not less than the operating temperature of the system and approved for such use or shall comply with ASME A112.4.1. Materials shall be straight, rigid lengths only, without coils or flexes.

(3) Discharge pipe shall discharge independently by gravity through an air gap into the drainage system or outside of the building with the end of the pipe not exceeding 2 feet (610 mm) and not less than 6 inches (152 mm) above the ground pointing downwards.

(4) Discharge in such a manner that does not cause personal injury or structural damage.

(5) No part of such discharge pipe shall be trapped or subject to freezing.

(6) The terminal end of the pipe shall not be threaded.

(7) Discharge from a relief valve into a water heater pan shall be prohibited.

(8) The discharge termination point shall be readily observable.

| EXCEPTION: | Where no drainage was provided, replacement water heating equipment shall only be required to provide a drain pointing downward from the relief valve to extend between two (2) feet (610 mm) and six (6) inches (152 mm) from the floor. No additional floor drain need be provided. | | --- | --- |

609.12 Insulation of Potable Water Piping. Domestic water piping within commercial buildings shall be insulated in accordance with Section C404.6 of the Washington State Energy Code, as applicable.

610.4Sizing Water Supply and Distribution Systems. Systems within the range of Table 610.4 may be sized from that table or by the method set forth in Section 610.5.

Listed parallel water distribution systems shall be installed in accordance with their listing.

611.1 Application. Drinking water treatment units shall comply with NSF 42 or NSF 53. Water softeners shall comply with NSF 44. Ultraviolet water treatment systems shall comply with NSF 55. Reverse osmosis drinking water treatment systems shall comply with NSF 58. Drinking water distillation systems shall comply with NSF 62.

The owner of a building that serves potable water to twenty-five or more people at least sixty or more days per year and that installs drinking water treatment units including, but not limited to, the treatment units in Section 611.1, may be regulated (as a Group A public water system) by the Washington state department of health under chapter 246-290 WAC. See Washington state department of health publication 331-488 for guidance.

612.1 General. Where residential fire sprinkler systems are installed, they shall be installed in accordance with the International Building Code or International Residential Code.

Sections 612.2 through 612.7.2 are not adopted.

History

• Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 23-23-108, § 51-56-0600, filed 11/15/23, effective 3/15/24
• WSR 23-02-057, 23-12-110, and 23-20-029, § 51-56-0600, filed 1/3/23, 6/7/23, and 9/25/23, effective 3/15/24
• WSR 20-02-072, § 51-56-0600, filed 12/26/19, effective 7/1/20
• WSR 17-10-074, § 51-56-0600, filed 5/3/17, effective 6/3/17
• WSR 16-02-044, § 51-56-0600, filed 12/30/15, effective 7/1/16. Statutory Authority: RCW 19.27A.025, 19.27A.045, and 19.27.074. WSR 13-23-094, § 51-56-0600, filed 11/20/13, effective 4/1/14. Statutory Authority: RCW 19.27.074, 19.27.031 and chapters 19.27 and 34.05 RCW. WSR 13-04-054, § 51-56-0600, filed 2/1/13, effective 7/1/13. Statutory Authority: RCW 19.27.031, 19.27.035, 19.27.074, and chapters 19.27 and 34.05 RCW. WSR 12-07-018, § 51-56-0600, filed 3/12/12, effective 4/12/12. Statutory Authority: RCW 19.27.074, 19.27.031 and chapters 19.27 and 34.05 RCW. WSR 10-03-101, § 51-56-0600, filed 1/20/10, effective 7/1/10. Statutory Authority: RCW 19.27.190, 19.27.020 and chapters 19.27 and 34.05 RCW. WSR 07-01-094, § 51-56-0600, filed 12/19/06, effective 7/1/07. Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 04-01-110, § 51-56-0600, filed 12/17/03, effective 7/1/04
• WSR 02-01-114, § 51-56-0600, filed 12/18/01, effective 7/1/02.

Wash. Admin. Code § 51-56-0700 Chapter 7—Sanitary drainage.

701.2 Drainage Piping. Materials for drainage piping shall be in accordance with one of the referenced standards in Table 701.1 except that:

1. No galvanized wrought-iron or galvanized steel pipe shall be used underground and shall be kept not less than 6 inches (152 mm) above ground.

2. ABS and PVC DWV piping installations shall be installed in accordance with applicable standards in Table 1701.1. Except for individual single family dwelling units, materials exposed within ducts or plenums shall have a maximum flame-spread index of 25 and a maximum smoke developed index of 50, when tested in accordance with ASTM E-84 and UL 723.

3. No vitrified clay pipe or fittings shall be used above ground or where pressurized by a pump or ejector. They shall be kept not less than 12 inches (305 mm) below ground.

4. Copper tube for drainage and vent piping shall have a weight of not less than that of copper drainage tube type DWV.

5. Stainless steel 304 pipe and fittings shall not be installed underground and shall be kept not less than 6 inches (152 mm) above ground.

6. Cast-iron soil pipe and fittings shall be listed and tested in accordance with standards referenced in Table 701.2. Such pipe and fittings shall be marked with country of origin and identification of the original manufacturer in addition to markings required by referenced standards.

704.3 Commercial Sinks. Except where specifically required to be connected indirectly to the drainage system, or when first approved by the authority having jurisdiction, all plumbing fixtures, drains, appurtenances, and appliances shall be directly connected to the drainage system of the building or premises.

707.4 Location. Each horizontal drainage pipe shall be provided with a cleanout at its upper terminal, and each run of piping, that is more than 100 feet (30,480 mm) in total developed length, shall be provided with a cleanout for each 100 feet (30,480 mm), or fraction thereof, in length of such piping. An additional cleanout shall be provided in a drainage line for each aggregate horizontal change of direction exceeding 135 degrees (2.36 rad).

| EXCEPTIONS: | 1. Cleanouts shall be permitted to be omitted on a horizontal drain line less than 5 feet (1,524 mm) in length unless such line is serving sinks or urinals. | | --- | --- | | | 2. Cleanouts shall be permitted to be omitted on a horizontal drainage pipe installed on a slope of 72 degrees (1.26 rad) or less from the vertical angle (one-fifth bend). | | | 3. Except for the building drain, its horizontal branches, and urinals, a cleanout shall not be required on a pipe or piping that is above the floor level of the lowest floor of the building. | | | 4. An approved type of two-way cleanout fitting, installed inside the building wall near the connection between the building drain and the building sewer or installed outside of a building at the lower end of a building drain and extended to grade, shall be permitted to be substituted for an upper terminal cleanout. |

707.9 Clearance. Each cleanout in piping 2 inches (50 mm) or less in size shall be so installed that there is a clearance of not less than 12 inches (457 mm) in front of the cleanout. Cleanouts in piping exceeding 2 inches (50 mm) shall have a clearance of not less than 18 inches (610 mm) in front of the cleanout. Cleanouts in under-floor piping shall be extended to or above the finished floor or shall be extended outside the building where there is less than 18 inches (457 mm) vertical overall, allowing for obstructions such as ducts, beams, and piping, and 30 inches of (762 mm) horizontal clearance from the means of access to such cleanout. No under-floor cleanout shall be located exceeding 20 feet (1,524 mm) from an access door, trap door, or crawl hole.

CHAPTER 7, PART II—BUILDING SEWERS

Part II Building Sewers. Delete all of Part II (Sections 713 through 723, and Tables 717.1 and 721.1).

History

• Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 23-23-108, § 51-56-0700, filed 11/15/23, effective 3/15/24
• WSR 23-02-057, 23-12-110, and 23-20-029, § 51-56-0700, filed 1/3/23, 6/7/23, and 9/25/23, effective 3/15/24
• WSR 17-10-074, § 51-56-0700, filed 5/3/17, effective 6/3/17
• WSR 16-02-044, § 51-56-0700, filed 12/30/15, effective 7/1/16. Statutory Authority: RCW 19.27.074, 19.27.031 and chapters 19.27 and 34.05 RCW. WSR 13-04-054, § 51-56-0700, filed 2/1/13, effective 7/1/13
• WSR 10-03-101, § 51-56-0700, filed 1/20/10, effective 7/1/10. Statutory Authority: RCW 19.27.190, 19.27.020 and chapters 19.27 and 34.05 RCW. WSR 07-01-094, § 51-56-0700, filed 12/19/06, effective 7/1/07. Statutory Authority: RCW 19.27.031, 19.27.074. WSR 02-01-114, § 51-56-0700, filed 12/18/01, effective 7/1/02.

Wash. Admin. Code § 51-56-0800 Chapter 8—Indirect wastes.

History

• Statutory Authority: RCW 19.27.190, 19.27.020 and chapters 19.27 and 34.05 RCW. WSR 07-01-094, § 51-56-0800, filed 12/19/06, effective 7/1/07. Statutory Authority: RCW 19.27.031, 19.27.074. WSR 02-01-114, § 51-56-0800, filed 12/18/01, effective 7/1/02.

Wash. Admin. Code § 51-56-0900 Chapter 9—Vents.

911.1 Circuit Vent Permitted. A maximum of eight fixtures connected to a horizontal branch drain shall be permitted to be circuit vented. Each fixture drain shall connect horizontally to the horizontal branch being circuit vented. The horizontal branch drain shall be classified as a vent from the most downstream fixture drain connection to the most upstream fixture drain connection to the horizontal branch. Given its grease-producing potential, restaurant kitchen equipment shall not be connected to a circuit vented system. Each trap arm shall connect horizontal to the horizontal branch being circuit vented in accordance with Table 1002.2.

| EXCEPTION: | Back-outlet and wall-hung water closets shall be permitted to be circuit vented provided that no floor-outlet fixtures are connected to the same horizontal branch. | | --- | --- |

History

• Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 23-02-057, 23-12-110, and 23-20-029, § 51-56-0900, filed 1/3/23, 6/7/23, and 9/25/23, effective 3/15/24
• WSR 20-02-072, § 51-56-0900, filed 12/26/19, effective 7/1/20
• WSR 16-02-044, § 51-56-0900, filed 12/30/15, effective 7/1/16. Statutory Authority: RCW 19.27.074, 19.27.031 and chapters 19.27 and 34.05 RCW. WSR 13-04-054, § 51-56-0900, filed 2/1/13, effective 7/1/13
• WSR 10-03-101, § 51-56-0900, filed 1/20/10, effective 7/1/10. Statutory Authority: RCW 19.27.190, 19.27.020 and chapters 19.27 and 34.05 RCW. WSR 07-01-094, § 51-56-0900, filed 12/19/06, effective 7/1/07. Statutory Authority: RCW 19.27.031, 19.27.074. WSR 02-01-114, § 51-56-0900, filed 12/18/01, effective 7/1/02.

Wash. Admin. Code § 51-56-1000 Chapter 10—Traps and interceptors.

History

• Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 16-02-044, § 51-56-1000, filed 12/30/15, effective 7/1/16. Statutory Authority: RCW 19.27.074, 19.27.031 and chapters 19.27 and 34.05 RCW. WSR 13-04-054, § 51-56-1000, filed 2/1/13, effective 7/1/13.

Wash. Admin. Code § 51-56-1100 Chapter 11—Storm drainage.

1101.4 Material Uses. Pipe, tube, and fittings conveying rainwater shall be of such materials and design as to perform their intended function to the satisfaction of the authority having jurisdiction. Conductors within a vent or shaft shall be of cast iron, galvanized steel, wrought iron, copper, copper alloy, lead, Scheduled 40 ASB DWV, Scheduled 40 PVC DWV, stainless steel 304 or 316L (stainless steel 304 pipe and fittings shall not be installed underground and shall be kept not less than six (6) inches (152 mm) aboveground), or other approved materials, and changes in direction shall conform to the requirements of Section 706.0. ABS and PVC DWV piping installations shall be installed in accordance with IS 5 and IS 9. Except for individual single-family dwelling units, materials exposed within ducts or plenums shall have a maximum flame-spread index of 25 and a maximum smoke-developed index of 50, when tested in accordance with ASTM E-84 and UL 723.

1101.12.2 Secondary Drainage. Secondary (emergency) roof drainage shall be provided by one of the methods specified in Section 1101.12.2.1 or Section 1101.12.2.2.

1101.12.2.1 Roof Scuppers or Open Side. Secondary roof drainage shall be provided by an open-sided roof or scuppers where the roof perimeter construction extends above the roof in such a manner that water will be entrapped. An open-sided roof or scuppers shall be sized to prevent the depth of ponding water from exceeding that for which the roof was designed as determined by Section 1101.12.1. Scupper openings shall be not less than four (4) inches (102 mm) high and have a width equal to the circumference of the roof drain required for the area served, sized in accordance with Table 1103.1, based on double the rainfall rate for the local area.

| EXCEPTION: | Scupper openings shall be permitted to be sized for the normal rainfall rate where the structural design of the roof includes a ponding instability analysis in accordance with ASCE 7 for the additional ponding load resulting from twice the normal rainfall rate or a 15-minute duration/100-year return period storm. The analysis shall assume the primary drain system is blocked. | | --- | --- |

1101.12.2.2 Secondary Roof Drain. Secondary roof drains shall be provided. The secondary roof drains shall be located not less than two (2) inches (51 mm) above the roof surface. The maximum height of the roof drains shall be a height to prevent the depth of ponding water from exceeding that for which the roof was designed as determined by Section 1101.12.1. The secondary roof drains shall connect to a piping system in accordance with Section 1101.12.2.2.1 or Section 1101.12.2.2.2.

1101.12.2.2.1 Separate Piping System. The secondary roof drainage system shall be a separate system of piping, independent of the primary roof drainage system. The discharge shall be above grade, in a location observable by the building occupants or maintenance personnel. Secondary roof drain systems shall be sized in accordance with Section 1101.12.1 based on double the rainfall rate for the local area.

| EXCEPTION: | The secondary drainage system shall be permitted to be sized for the normal rainfall rate where the structural design of the roof includes a ponding instability analysis in accordance with ASCE 7 for the additional ponding load resulting from twice the normal rainfall rate or a 15-minute duration/100-year return period storm. The analysis shall assume the primary drain system is blocked. | | --- | --- |

1101.12.2.2.2 Combined System. The secondary roof drains shall connect to the vertical piping of the primary storm drainage conductor downstream of the last horizontal offset located below the roof. The primary storm drainage system shall connect to the building storm water that connects to an underground public storm sewer. The combined secondary and primary roof drain systems shall be sized in accordance with Section 1103.0 based on double the rainfall rate for the local area.

1101.13 Cleanouts. Cleanouts for building storm drains shall comply with the requirements of this section.

1101.13.1Locations. Rain leaders and conductors connected to a building storm sewer shall have a cleanout installed at the base of the outside leader or outside conductor before it connects to the horizontal drain. Cleanouts shall be placed inside the building near the connection between the building drain and the building sewer or installed outside the building at the lower end of the building drain and extended to grade.

1101.13.2Cleaning. Each cleanout shall be installed so that it opens to allow cleaning in the direction of flow of the soil or waste or at right angles thereto, and except in the case of wye branch and end-of-line cleanouts, shall be installed vertically above the flow line of the pipe.

1101.13.3 Access. Cleanouts installed under concrete or asphalt paving shall be made accessible by yard boxes, or extending flush with paving with approved materials and be adequately protected.

1101.13.4 Manholes. Approved manholes may be installed in lieu of cleanouts when first approved by the authority having jurisdiction. The maximum distance between manholes shall not exceed three hundred (300) feet (91.4 m).

The inlet and outlet connections shall be made by the use of a flexible compression joint no closer than twelve (12) inches (305 mm) to, and not farther than three (3) feet (914 mm) from the manhole. No flexible compression joints shall be embedded in the manhole base.

1103.0 Size of Leaders, Conductors, and Storm Drains.

1103.1 Vertical Conductors and Leaders. Vertical conductors and leaders shall be sized by the maximum projected roof area and Table 1103.1. Vertical conductors and leaders for secondary roof drains shall be sized based on double the rainfall rate for the local area.

| EXCEPTION: | Vertical conductors and leaders for secondary drainage systems shall be permitted to be sized for the normal rainfall rate where the structural design of the roof includes a ponding instability analysis in accordance with ASCE 7 for the additional ponding load resulting from twice the normal rainfall rate or a 15-minute duration/100-year return period storm. The analysis shall assume the primary drain system is blocked. | | --- | --- |

1103.2 Size of Horizontal Storm Drains and Sewers. The size of building storm drains, or building storm sewers or their horizontal branches shall be based on the maximum projected roof or paved area to be handled and Table 1103.2. Building storm drains, building storm sewers, or their horizontal branches receiving drainage from secondary roof drain systems shall be sized based on double the rainfall rate for the local area.

| EXCEPTION: | Building storm drains, building storm sewers, or their horizontal branches receiving drainage from secondary drainage systems shall be permitted to be sized for the normal rainfall rate where the structural design of the roof includes a ponding instability analysis in accordance with ASCE 7 for the additional ponding load resulting from twice the normal rainfall rate or a 15-minute duration/100-year return period storm. The analysis shall assume the primary drain system is blocked. | | --- | --- |

1103.3 Size of Roof Gutters. The size of semi-circular gutters shall be based on the maximum projected roof area and Table 1103.3.

1103.4 Side Walls Draining onto a Roof. Where vertical walls project above a roof to permit storm water to drain into the roof area below, the adjacent roof area shall be permitted to be computed from Table 1103.1 as follows:

(1) (No change to Items (1) through (7))

Secondary drainage systems for the adjacent roof area shall be sized based on double the rainfall rate for the local area.

| EXCEPTION: | Secondary drainage systems for the adjacent roof area shall be permitted to be sized for the normal rainfall rate where the structural design of the roof includes a ponding instability analysis in accordance with ASCE 7 for the additional ponding load resulting from twice the normal rainfall rate or a 15-minute duration/100-year return period storm. The analysis shall assume the primary drain system is blocked. | | --- | --- |

1105.0 Controlled-Flow Roof Drainage. This section is not adopted.

History

• Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 23-23-108, § 51-56-1100, filed 11/15/23, effective 3/15/24
• WSR 23-02-057, 23-12-110, and 23-20-029, § 51-56-1100, filed 1/3/23, 6/7/23, and 9/25/23, effective 3/15/24
• WSR 16-02-044, § 51-56-1100, filed 12/30/15, effective 7/1/16. Statutory Authority: RCW 19.27.074, 19.27.031 and chapters 19.27 and 34.05 RCW. WSR 13-04-054, § 51-56-1100, filed 2/1/13, effective 7/1/13. Statutory Authority: RCW 19.27.190, 19.27.020 and chapters 19.27 and 34.05 RCW. WSR 07-01-094, § 51-56-1100, filed 12/19/06, effective 7/1/07. Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 04-01-110, § 51-56-1100, filed 12/17/03, effective 7/1/04.

Wash. Admin. Code § 51-56-1300 Chapter 13—Health care facilities and medical gas and vacuum systems.

Part II Medical Gas and Vacuum Systems

1303.8 Water Mains for Hospitals. Hospitals shall be provided with not less than two approved potable water mains that are installed in such a manner as to prevent the interruption of water service.

1305.3Minimum Station Outlets/Inlets. Station outlets and inlets for medical gas and medical vacuum systems for facilities licensed or certified by Washington state department of health (DOH) or Washington state department of social and health services (DSHS) shall be provided as listed in chapters 246-320 and 246-330 WAC as required by the applicable licensing rules as applied by DOH construction review services. All other medical gas and medical vacuum systems shall be provided as listed in Table 1305.3.

History

• Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 16-02-044, § 51-56-1300, filed 12/30/15, effective 7/1/16. Statutory Authority: RCW 19.27.074, 19.27.031 and chapters 19.27 and 34.05 RCW. WSR 13-04-054, § 51-56-1300, filed 2/1/13, effective 7/1/13
• WSR 10-03-101, § 51-56-1300, filed 1/20/10, effective 7/1/10. Statutory Authority: RCW 19.27.190, 19.27.020 and chapters 19.27 and 34.05 RCW. WSR 07-01-094, § 51-56-1300, filed 12/19/06, effective 7/1/07. Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 04-01-110, § 51-56-1300, filed 12/17/03, effective 7/1/04
• WSR 02-01-114, § 51-56-1300, filed 12/18/01, effective 7/1/02.

Wash. Admin. Code § 51-56-1400 Chapter 14—Reserved.

History

• Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 16-02-044, § 51-56-1400, filed 12/30/15, effective 7/1/16. Statutory Authority: RCW 19.27.074, 19.27.031 and chapters 19.27 and 34.05 RCW. WSR 13-04-054, § 51-56-1400, filed 2/1/13, effective 7/1/13
• WSR 10-03-101, § 51-56-1400, filed 1/20/10, effective 7/1/10. Statutory Authority: RCW 19.27.190, 19.27.020 and chapters 19.27 and 34.05 RCW. WSR 07-01-094, § 51-56-1400, filed 12/19/06, effective 7/1/07. Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 04-01-110, § 51-56-1400, filed 12/17/03, effective 7/1/04
• WSR 02-01-114, § 51-56-1400, filed 12/18/01, effective 7/1/02.

Wash. Admin. Code § 51-56-1500 Chapter 15—Alternate water sources for nonpotable applications.

1501.1 Applicability. The provisions of this chapter and the Washington state department of health shall apply to the construction, alteration, and repair of alternate water source systems for nonpotable applications.

History

• Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 20-02-072, § 51-56-1500, filed 12/26/19, effective 7/1/20
• WSR 16-02-044, § 51-56-1500, filed 12/30/15, effective 7/1/16.

Wash. Admin. Code § 51-56-1600 Chapter 16—Nonpotable rainwater catchment systems.

1601.1 Applicability. The provisions of this chapter and the Washington state department of health shall apply to the construction alteration and repair of nonpotable rainwater catch systems.

History

• Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 20-02-072, § 51-56-1600, filed 12/26/19, effective 7/1/20
• WSR 16-02-044, § 51-56-1600, filed 12/30/15, effective 7/1/16. Statutory Authority: RCW 19.27A.025, 19.27A.045, and 19.27.074. WSR 13-23-094, § 51-56-1600, filed 11/20/13, effective 4/1/14. Statutory Authority: RCW 19.27.074, 19.27.031 and chapters 19.27 and 34.05 RCW. WSR 13-04-054, § 51-56-1600, filed 2/1/13, effective 7/1/13. Statutory Authority: RCW 19.27.031, 19.27.035, 19.27.074, and chapters 19.27 and 34.05 RCW. WSR 12-07-018, § 51-56-1600, filed 3/12/12, effective 4/12/12. Statutory Authority: RCW 19.27.074, 19.27.031 and chapters 19.27 and 34.05 RCW. WSR 10-03-101, § 51-56-1600, filed 1/20/10, effective 7/1/10. Statutory Authority: RCW 19.27.190, 19.27.020 and chapters 19.27 and 34.05 RCW. WSR 07-01-094, § 51-56-1600, filed 12/19/06, effective 7/1/07.

Wash. Admin. Code § 51-56-1700 Chapter 17—Referenced standards.

Referenced Standards.

TABLE 1701.1

Standards for Materials, Equipment, Joints and Connections

Where more than one standard has been listed for the same material or method, the relevant portions of all such standards shall apply.

Add the following standard to those listed in Table 1701.1:

| Standard Number | Standard Title | Application | | --- | --- | --- | | WAC 246-290-490 | Washington State Department of Health Cross-connection Control Requirements | Backflow Protection |

History

• Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 16-02-044, § 51-56-1700, filed 12/30/15, effective 7/1/16. Statutory Authority: RCW 19.27A.025, 19.27A.045, and 19.27.074. WSR 13-23-094, § 51-56-1700, filed 11/20/13, effective 4/1/14. Statutory Authority: RCW 19.27.074, 19.27.031 and chapters 19.27 and 34.05 RCW. WSR 13-04-054, § 51-56-1700, filed 2/1/13, effective 7/1/13.

Wash. Admin. Code § 51-56-90700 Reserved.

History

• Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 16-02-044, § 51-56-90700, filed 12/30/15, effective 7/1/16. Statutory Authority: RCW 19.27.074, 19.27.031 and chapters 19.27 and 34.05 RCW. WSR 13-04-054, § 51-56-90700, filed 2/1/13, effective 7/1/13.

Wash. Admin. Code § 51-56-90800 Reserved.

History

• Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 16-02-044, § 51-56-90800, filed 12/30/15, effective 7/1/16. Statutory Authority: RCW 19.27.074, 19.27.031 and chapters 19.27 and 34.05 RCW. WSR 13-04-054, § 51-56-90800, filed 2/1/13, effective 7/1/13.

Wash. Admin. Code § 51-56-92000 Reserved.

History

• Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 16-02-044, § 51-56-92000, filed 12/30/15, effective 7/1/16. Statutory Authority: RCW 19.27.074, 19.27.031 and chapters 19.27 and 34.05 RCW. WSR 13-04-054, § 51-56-92000, filed 2/1/13, effective 7/1/13.