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UL System Wall Penetration Firestop Detail

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UL System No. W-L-1001 for wall penetrations carrying steel pipes, iron pipes, conduits, copper tubing, copper pipes, or flexible metal piping through a stud and gypsum board wall assembly. The annular space between the penetrant and the wall is sealed with a fill, void, or cavity material consisting of caulk or sealant bearing the UL classification marking. The assembly achieves F-ratings of one, two, three, and four hours, T-ratings from zero to four hours, and low air leakage ratings at ambient and four hundred degrees Fahrenheit.

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