Standard roof drain and overflow drain installations set into a built-up roof over plywood sheathing and structural framing. The assembly features a roof drain bowl and an overflow drain bowl positioned within sumps, each equipped with a dome strainer and connected to downspouts. A four-pound lead flashing sheet is set into roof cement over the installed base sheet around the drain sumps to maintain a waterproof seal. Wood framing with two-by-six minimum members secured with ten-penny nails at six inches on center staggered supports the perimeter. The overflow drain maintains a five-inch minimum height above the roof deck with a two-inch vertical dimension to the weir.
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