Roof drain and overflow drain assemblies are set into the roof assembly with a minimum two-foot separation between drain centers. A single-ply roof membrane runs over rigid insulation, with tapered insulation sloped toward the collars. A two-inch collar is provided at overflow drains only, projecting two inches above the adjacent insulation level. The roof sheathing is supported per structural drawings.
A402 6 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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