This plan detail lays out a roof drain sump with a one-half inch per foot slope extending outwards in all directions. The perimeter edge of the sump serves as the zero-level starting point for calculating tapered roof insulation. The drain elevation is set one inch below the sump perimeter, while the adjacent overflow scupper is positioned two inches higher at the plus-two-inch elevation mark.
1/2"/FT SLOPE 2' - 0" 2' - 0" 2' - 0" MIN 2' - 0" 2' - 0" +2" EL POINT = 0 OVERFLOW SCUPPER SET DRAIN ELEVATION 1" BELOW SUMP PERIMETER EDGE OF SUMP IS THE ZERO-LEVEL BEGINNING POINT FOR THE CALCULATION OF TAPERED INSULATION FOR ROOF SLOPE BEGINNING OF TAPERED INSULATION 1/2"/FT SLOPE 1/2"/FT SLOPE 1/2"/FT SLOPE 0"
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