Questão jurídica principal
Whether the SIA recommendations 242/1 and 242/2 were incorporated into the parties' contract by express or tacit agreement
Decisão extraída
No tacit incorporation was proven; the recommendations were not part of the contract.
Fundamentação extraída
SIA recommendations are not treated as binding industry custom merely because they exist; they apply only if the parties made them contractual. The appellant failed to prove that the parties had previously used those recommendations as a settled practice between them.