A cast iron primary drain assembly is integrated into the roof construction, installed per manufacturer specifications. The assembly penetrates through single-ply roofing, which is installed per the roofing manufacturer's specifications. Rigid insulation is installed directly over the metal deck, creating the required slope and sump around the drain bowl.
CAST IRON PRIMARY DRAIN ASSEMBLY, INSTALL PER MANUFACTURER'S SPECIFICATIONS SINGLE-PLY ROOFING, INSTALL PER ROOFING MANUFACTURER'S SPECIFICATIONS RIGID INSULATION OVER METAL DECK 3 A820
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