Architectural · A-XD9P5

Roof and Overflow Drain Detail

Materials

Concrete Steel

Elements

Roofs Floors / Slabs Waterproofing / Flashing Insulation Drainage Connections / Plates

Connections

Welded Connection

About this detail

A roof drain and overflow drain assembly is installed at a concrete structural slab with metal deck. The assembly features a roof drain body connected to a rainwater leader, topped with a strainer and a dashed collar insert at the overflow drain. The surrounding build-up includes a vapor barrier, tapered rigid insulation, coverboard, membrane adhesive, and a fully adhered single-ply roofing membrane. Fasteners and plates secure the components, sealed with mastic at joints, with a 1 1/2-inch minimum weld indicated at the drain flange assembly.

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