Fire Protection · F-H3XKQ

Pipe Penetration Firestop Detail at Concrete Wall

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A pipe penetration through a one-hour or two-hour fire-rated concrete wall uses firestop caulk and damming material. The maximum allowable annular space to be filled is two inches, with a minimum annular space of three-quarters of an inch for a nominal four-inch maximum pipe size. Intumescent firestop caulk is applied on both sides of the wall against fire-rated wall damming mats. Caulk depth requirements vary based on insulation thickness, ranging from a one-inch depth for one-inch thick insulation up to a two-inch depth for two- to three-inch thick insulation. For solid concrete walls, the firestop sealant may be centered in the wall with damming material on both sides.

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