This roof section detail shows a PVC thermoplastic roof membrane applied over a cover board and substrate board, with a dashed vapor barrier installed above a structural metal deck. R-30 rigid insulation fills the main assembly thickness below the roof layers. Treated smooth exterior-grade plywood sheathing is installed beneath a Sarnatred walkway pad specifically at roof access points such as stair bottoms, roof hatches, and ladder locations. The exposed metal deck underside is painted black.
COVER BOARD PVC THERMOPLASTIC ROOF MEMBRANE; REF. SPECS. TREATED SMOOTH EXTERIOR GRADE PLYWOOD SHEATHING UNDER WALKWAY PAD AT ROOF ACCESS POINTS ONLY (PROVIDE AT BOTTOM OF ROOM STAIRS, IN FRONT OR ROOF ACCESS HATCH, AT LADDER LOCATIONS, ECT.) R-30 RIGID INSULATION SARNATRED WALKPAD (REF. ROOF PLANS FOR LOCATIONS OF WALKPADS) VAPOR BARRIER SHOWN DASHED SUBSTRATE BOARD METAL DECK; (PAINT BLACK WHERE EXPOSED); REF. STRUCT
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