Roof drain installation supported by roof sheathing and tapered rigid insulation or equal at the drain sump less than three inches to one horizontal foot. The roof drain is installed per manufacturer specifications with sealant and a reinforced membrane over the rigid insulation layer.
ROOF SHEATHING, SEE STRUCTURAL FOR DRAINS WITH TAPERED RIGID INSULATION OR EQUAL AT DRAIN SUMP LESS THAN 3 INCHES TO 1 HORIZONTAL FOOT ROOF DRAIN, INSTALL PER MANUFACTURER SEALANT REINFORCED MEMBRANE RIGID INSULATION
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