A roof drain and an overflow drain are integrated into a single-ply roof membrane set over rigid insulation and timber roof sheathing. Tapered insulation slopes toward the drain bowls to ensure positive drainage. A two-inch vertical collar surrounds the overflow drain only, maintaining the required secondary drainage head. Pipe connections and structural supports below the roof deck are coordinated per structural drawings.
A542 8 2'-0" MIN. 2" OVERFLOW DRAIN TAPPER INSUL TO COLLAR 2" COLLAR @ OVERFLOW DRAINS ONLY ROOF DRAIN RIGID INSULATION SINGLE PLY ROOF MEMBRANE OVER RIGID INSULATION ROOF SHEATHING (SEE STRUCT.)
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