Architectural · A-VQYMR

Roof Drain Penetration and Flashing Detail

Materials

Elements

Roofs Waterproofing / Flashing Insulation Drainage Roof / Floor Openings

About this detail

A roof drain pipe penetration passes through a single-ply insulated roof assembly. The penetration passes through rigid insulation rated at a minimum of R-30 and treated wood blocking as required. A cone-shaped lead flashing is wrapped into the top of the pipe, extending a minimum of 12 inches above the roof level, and set in a continuous bed of mastic with a minimum 2-inch lap. A membrane transition sheet fully adheres the roofing cone to the single-ply roofing membrane. A stainless steel clamp secures the assembly, complemented by a galvanized watertight umbrella set in sealant wrapped over the top of the pipe.

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