A vent stack roof penetration flashing assembly incorporates a Sarnafil flashing membrane over Sarnafil base flashing, secured with Sarnafasteners and Sarnadiscs. The base flashing is hot-air welded to the Sarnafil roof membrane. An aluminum tape layer is applied over the penetration per note requirements when contaminated conditions exist. The assembly bears on a five-eighths-inch Dens Deck Prime roof board and four-inch minimum Polyiso insulation above a structural deck.
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