This cross section details a roof membrane lap joint over rigid insulation and roof sheathing, supported by a roof truss sized per structural drawings. A fastener and fastener plate secure the membrane lap, installed per the manufacturer's specifications. A reinforced membrane layer overlies the rigid insulation, incorporating a sealant bead at the lap edge. Dimensional clearances indicate a one and one-half inch approximate lap width with a half-inch minimum edge distance.
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
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