This roof drainage detail shows a roof drain and an overflow drain with an insert standpipe positioned two inches above the finished roof deck. The assembly features a roof depression over a roof deck as scheduled, with roof insulation and a finished roof deck set over a lead pan. Positive drainage of a two percent minimum is provided to the roof drains from all areas of the roof.
1' - 6" ROOF DECK AS SCHEDULED ROOF INSUL FINISHED ROOF DECK OVER LEAD PAN. PROVIDE POSITIVE DRAINAGE (2% MIN) TO ROOF DRAINS FROM ALL AREAS OF ROOF ROOF DRAIN ROOF DEPRESSION OVERFLOW DRAIN WITH INSERT STANDPIPE 2" ABOVE FIN. ROOF DECK. 2 1/2" 14 A8.5.1
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