A roof drain and overflow drain are installed on a roof deck with a minimum two-foot spacing between the drains. The assembly features a thirty-six inch square flashing positioned under the roofing membrane, rigid insulation, and an under deck clamp securing each drain body. The roof drain connects to a roof drain line, while the overflow drain features a two-inch high water dam and connects to an overflow line.
36" SQUARE FLASHING UNDER ROOFING UNDER DECK CLAMP ROOF DRAIN LINE OVERFLOW LINE ROOF DRAIN OVERFLOW DRAIN 2" HIGH WATER DAM ROOF DECK RIGID INSULATIO N 2'-0" MIN. RD OD
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