Architectural · A-2TPDM

Pipe Penetration Flashing at Roof

Materials

Elements

Roofs Decks Waterproofing / Flashing Roof / Floor Openings

About this detail

A pipe penetration flashing assembly at a roof deck features a plumbing vent passing through the roof opening, surrounded by a Duravent galvanized steel collar secured to the metal deck with a minimum of four number ten screws. A base flashing membrane of sixty mil TPA is set in a bed of sealant and clamped at the top using a one-inch by one-quarter-inch stainless steel hose clamp and draw band, with a five-course edge applied to the membrane. A three-by-four-minimum wood nailer provides edge blocking at the eight-inch minimum roof curb height. Sealant is applied all around, and the annular gap around the pipe is filled with fire acoustic sealant up to a three-quarter-inch maximum gap. A vandal-proof flash hood vent caps the assembly at the roof exterior.

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