The roof assembly consists of a single-ply roof membrane applied over rigid insulation supported by roof sheathing. Tapered insulation creates a drainage sump around the roof drain and overflow drain locations. A two-inch collar is provided at overflow drains only, maintaining a minimum two-foot separation between drain units.
2'-0" MIN. 2" OVERFLOW DRAIN TAPER 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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