Primary and secondary roof drains are installed through a metal deck roof assembly featuring a one-half-inch per foot slope toward the drainage points. Each drain assembly includes a roof sump receiver and an underdeck clamp securing the unit to the structural deck. The secondary drain incorporates a one-and-one-quarter-inch water dam and an extension sleeve set three-quarters of an inch above the primary drain extension sleeve.
SECONDARY ROOF DRAIN 1 1/4" WATER DAM SET EXTENSION SLEEVE 3/4" ABOVE PRIMARY DRAIN EXTENSION SLEEVE ROOF SUMP RECEIVER UNDERDECK CLAMP PRIMARY ROOF DRAIN RE: PLUMBING ROOF ASSEMBLY - SEE ROOF TYPES ROOF SUMP RECEIVER UNDER DECK CLAMP 1/2": 1' - 0" SLOPE METAL DECK EDITOR'S NOTE: THIS IS A SINGLE-PLY MEMBRANE DETAIL. BUILT-UP AND MODIFIED BITUMEN ROOFS REQUIRE A LEAD SUMP B
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