![]() ![]() Prescriptive building envelope requirements are determined based on the building’s climate zone classification (ASHRAE Standard 90.1–2007, Tables 5.5-1 to 5.5-8). Section 5.5 contains the prescriptive provisions for fenestration and opaque assemblies. Section 5 – Building Envelope RequirementsĪSHRAE 90.1-2007 Section 5.4 describes mandatory provisions for insulation installation (5.4.1) window, skylight, and door ratings (5.4.2) and air leakage (5.4.3).
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