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C407.2.1 Roof/Ceiling Thermal Envelope
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The roof or ceiling that functions as the building's thermal envelope shall be insulated to an R-value of at least R-10. Multiple-family residential roofs/ceilings shall be insulated to an R-value of at least R-19, space permitting. Where cavities beneath a roof deck are ventilated, the ceiling shall be considered the envelope component utilized in the Commission approved compliance software tools.