This roof drain assembly integrates into wood roof sheathing topped with rigid insulation and a single-ply membrane. A tapered R-20 poly-isocyanurate insulation creates a drain sump with a slope of less than three inches to one horizontal foot. The roof drain body is installed per the manufacturer's recommendations with perimeter sealant at the membrane interface.
ROOF SHEATHING, SEE STRUCTURAL FOR DRAINS WITH TAPERED R-20 POLY-ISO AT DRAIN SUMP LESS THAN 3 INCHES TO 1 HORIZONTAL FOOT ROOF DRAIN, INSTALL PER MANUFACTURER SEALANT SINGLE-PLY MEMBRANE RIGID INSULATION
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