Architectural · A-4CR2W

Roof Drain and Overflow

Materials

Elements

Roofs Vaults / Domes Insulation Drainage

About this detail

Primary and overflow roof drain assemblies are installed within a low-slope roof system. The primary roof drain features a dome strainer, compression ring, roof sump receiver, and an underdeck clamp secured per the manufacturer's instructions. An adjacent overflow roof drain incorporates an internal two-inch dam positioned higher than the primary drain and lower than the surrounding roof assembly. Both drain bodies are surrounded by spray insulation, continuous sealant, and bonding adhesive applied per the manufacturer. Dimensioned clearances include a two-foot minimum separation from structural gridlines and a one-foot offset to the primary drain centerline.

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