This plan detail shows a roof drain located centrally within a four-way sloped sump, accompanied by an adjacent overflow drain positioned one foot three inches away. The main roof drain elevation is set one inch below the sump perimeter, while the edge of the sump serves as the zero-level beginning point for tapered insulation calculations at a slope of one-half inch per foot. The overflow drain features a standpipe set two inches above the perimeter of the primary roof drain sump.
2' - 0" 2' - 0" 2' - 0" 2' - 0" 1' - 3" 1/2"/FT SLOPE 1/2"/FT SLOPE 1/2"/FT SLOPE 1/2"/FT SLOPE EDGE OF SUMP IS THE ZERO- LEVEL BEGINNING POINT FOR THE CALCULATION OF TAPERED INSULATION FOR ROOF SLOPE SET DRAIN ELEVATION 1" BELOW SUMP PERIMETER ROOF DRAIN BEGINNING OF TAPERED INSULATION SET OVERFLOW DRAIN STANDPIPE 2" ABOVE PERIMETER OF ROOF DRAIN SUMP OVERFLOW DRAIN WITH STANDPIPE EL POINT = 0
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