A cast iron primary drain assembly is integrated into a single-ply roofing system installed over rigid insulation and a metal deck. The assembly follows manufacturer specifications for drainage and membrane integration. Rigid insulation is tapered to slope toward the drain body.
CAST IRON PRIMARY DRAIN ASSEMBLY, INSTALL PER MANUFACTURER'S SPECIFICATIONS SINGLE-PLY ROOFING, INSTALL PER ROOFING MANUFACTURER'S SPECIFICATIONS RIGID INSULATION OVER METAL DECK
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