A single-ply roof membrane is installed over rigid insulation and roof sheathing supported by structural framing. Tapered insulation slopes toward the roof drain and overflow drain locations. A two-inch collar is provided at overflow drains only, set two inches above the standard drain sump. Drain bodies are mechanically secured through the assembly with clamping rings and hardware.
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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