Roof drain and overflow drain assemblies are set into a sump receiver and secured to the roof deck with an under deck clamp, with flashing integrated into the roofing membrane. The overflow drain is positioned with a two-inch minimum height above the roof surface to limit ponding water depth. Drainage piping connects beneath the deck with insulated runs sloped at one-fourth inch per foot. A drainage pipe penetrates the exterior wall and is sealed with acrylic sealant.
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