The assembly consists of a thermoplastic-coated sheet metal scupper set into a parapet wall, with all scupper joints soldered for watertightness. The scupper flange is hot-air welded to the roof membrane flashing, which is installed with a water cut-off mastic and a full-perimeter sealant bead. The scupper is positioned to provide an overflow path two inches above the main roof membrane level. The scupper rests on pressure-treated wood blocking, which is secured to the wall structure using galvanized annular ring shank nails spaced at three inches on center.
ROOF SIDE FLANGE, HOT AIR WELD WATER CUT-OFF MASTIC SEALANT FULL PERIMETER THERMOPLASTIC COATED SHEET METAL SCUPPER, SOLDER ALL SCUPPER JOINTS SLOPE AT MAIN SCUPPER 2" ABOVE ROOF MEMBRANE ROOF MEMBRANE FLASHING PT WOOD BLOCKING GALVANIZED ANNULAR RING SHANK NAILS (3" O.C.)
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