Electrical · E-9SNNA

Firestop through Wall Penetration Detail

Materials

Steel Timber / Wood Metal (misc.)Gypsum / Drywall

Elements

About this detail

An assembly detailing a through-penetration firestop system for a metal pipe or conduit passing through a one to two-hour fire-rated steel stud and gypsum wall board partition. The annular space around the penetrating item accommodates one or more wraps of intumescent wrap strip, depending on the gap dimension, with strips friction fit or secured using foil tape or sixteen gauge steel tie wire. The wrap strip slides into the opening leaving a maximum three-quarters of an inch exposed wrap beyond the wall surface on both sides. Edges and seams are sealed with a quarter-inch minimum bead of intumescent putty. Firestop installation must be executed on both sides of the wall in accordance with ASTM-E814 and UL 1479 standards for UL system number WL 1002.

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