Annex 1

(Art. 10 para. 1 and 15 para. 1)

Requirements for Soundproofing of Windows

¹The weighted sound reduction index for the building, including the spectrum-adjustment factor, R’w + (C or Ctr), measured on site of the windows and related elements such as roller-shutter boxes and quiet ventilators must be at least equal to the following minimum values, depending on the relevant rating sound level Lr:

²R’w is equal to at least 35 dB and at most 41 dB.

³For particularly large windows, the enforcement authorities shall impose appropriate requirements that are stricter than paragraphs 1 and 2.

⁴The weighted sound reduction index for buildings, R’w, and the spectrum-adjustment factor, C or Ctr, are determined according to the recognised rules, in particular the ISO 140 and ISO 717 standards of the International Standards Organisation.

⁵The spectrum-adjustment factor Ctr applies to predominantly low frequency noise, in particular from roads with a maximum speed of up to 80 km/h and from airfields. The spectrum-adjustment factor C applies to predominantly high frequency noise, in particular from roads with a maximum speed above 80 km/h and from railways.

⁶The enforcement authorities may order the installation of quiet ventilators in bedrooms.