This cross-section details a reinforced membrane lap joint installed over rigid insulation and roof sheathing supported by a wood roof truss. The assembly features a fastener and fastener plate installed per the manufacturer specifications. A reinforced membrane is layered over the rigid insulation with a specified lap dimension, sealed with sealant applied per the manufacturer. Dimensions indicate a minimum 1/2 inch lap edge and an approximate 5 1/2 inch lap width, with a 1 1/2 inch minimum clearance dimension.
1 1/2" MIN. 1/2" MIN. 5 1/2" (APPX.) ROOF TRUSS - SEE STRUCTURAL INSTALL PER MANUFACTURER SEALANT FASTENER & FASTENER PLATE, INSTALL PER MANUFACTURER REINFORCED MEMBRANE RIGID INSULATION ROOF SHEATHING, SEE STRUCTURAL 1
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