This cross section details a reinforced membrane roof lap joint installed over rigid insulation and roof sheathing supported by a wood roof truss. The membrane layer is secured with mechanical fasteners and fastener plates installed per the manufacturer specifications, maintaining minimum 1/2-inch and 1 1/2-inch edge dimensions. Sealant is applied at the lap joint in accordance with manufacturer guidelines to ensure weather-tightness.
1 1/2" MIN. 1/2" MIN. 5 1/2" (APPX.) WOOD ROOF TRUSS - SEE STRUCTURAL INSTALL PER MANUFACTURER SEALANT FASTENER & FASTENER PLATE, INSTALL PER MANUFACTURER REINFORCED MEMBRANE RIGID INSULATION ROOF SHEATHING, SEE STRUCTURAL
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