Architectural · A-Y7VF2

Fire-Rated Pipe Penetration

Materials

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

Elements

Walls Partitions Bracing Roof / Floor Openings

About this detail

A steel pipe, steel conduit, electrical metallic tubing, or copper tubing passes through a one, two, three, or four-hour fire-rated gypsum wallboard and stud wall assembly. The wall framing consists of either nominal two-by-four-inch wood studs spaced sixteen inches on center or minimum three-and-five-eighths-inch-deep steel channel studs spaced up to twenty-four inches on center. The penetrating steel pipe or conduit has a maximum diameter of twelve inches, while copper tubing or flexible steel conduit has specific dimensional limits with corresponding hourly F and T ratings. An annular space between the pipe or conduit and the gypsum wallboard is completely filled with a firestop caulk material, specifically applying a minimum one-quarter-inch bead to the perimeter on both sides of the wall assembly. The firestop system utilizes Minnesota Mining and Manufacturing Company Types CP-25 N/S, CP-25 WB, or CP-25 WB+ caulk, where L ratings apply exclusively when Type CP-25 WB+ caulk is used.

SECTION A-A WB+. (Note: L Ratings apply only when Type CP-25 WB+ caulk is used.) Minnesota Mining & Mfg. Co.-Types CP-25 N/S, CP-25 WB, CP-25 "Bearing the UL Classification Marking + When copper is used, T Rating is 0 h. 1 1 4 12 6 Max Pipe Diam, In or Conduit 0 to 3/16 0 to 1/4 1/4 to 1/2 1/4 to 1/2 3/16 to 3/8 Annular Space, In 1 or 2 3 or 4 1 or 2 1 or 2 3 or 4 F Hr Rating, 0+, 1 or 2 3 or 4 0 0 0 Rating, T Hr (Formerly System No. 147) F Ratings - 1, 2, 3 and 4 Hr (See Item 2 and 3) T Ratings - 0, 1, 2, 3, and 4 Hr (See item 3) L Rating At Ambient - less than 1 CFM/sq ft (See Item 3) L Rating At 400 F - less than 1 CFM/sq ft (See Item 3) SYSTEM No. WL1001 A 2 A 3 1B 3 1A Wall assembly-The 1, 2, 3 hr fire-rated gypsum wallboard/stud wall assembly shall be constructed of the materials and in the manner described the individual U300 or U400 Series Wall or Partition Designs in the UL Fire Resistance Directory and shall include the following construction features: Studs-Wall framing may consist of either wood studs (max. 2 h fire rated assemblies) or steel channel studs. Wood studs to consist of nom 2 by 4 in. lumber spaced 16 in. OC with nom 2 by 4 in. lumber end plates and cross braces. Steel studs to be min 3-5/8 in. wide by 1-2/8 in. wide by 1-3/8 in. deep channels spaced max 24 in. OC. Wallboard, Gypsum-Nom 12 in. diam (or smaller) Schedule 10 (or heavier) steep pipe nom 6 in. diam (or smaller) steel conduit, nom 4 in. diam (or smaller) steel electrical metallic tubing or Type L or (or heavier) copper tubing or nom . 1 diam (or smaller) flexible steel conduit. Pipe or Conduit-Nom 12 in. diam (or smaller) Schedule 10 (or heavier) steel pipe nom 6 in. diam (or smaller) steel conduit, nom 4 in. diam (or smaller) steel electrical metallic tubing or Type L or (or heavier) copper tubing or nom 1 diam (or smaller) flexible steel conduit. When copper pipe of flexible steel conduit is used, max F Rating of firestop system (Item3) is 2 h. Steel pipes or conduits larger than nom 4 in. diam may only be used in walls constructed using steel channel studs. A max of one pipe conduit is permitted in the firestop system. Pipe of conduit to be installed near center of stud cavity width and to be rigidly supported on both sides of wall assembly. Fill Void or Cavity Material-Caulk-Caulk fill material installed to completely fill annular space between pipe or conduit and gypsum wallboard and with a min. 1/4 in. diam bead of caulk applied to perimeter of pipe or conduit at its egress from the wall. Caulk installed symmetrically on both sides of wall assembly in which it is installed, as shown in the following table. The hourly T Rating of the firestop system is dependent upon the type or size of the pipe or conduit and the hourly fire rating of the wall assembly in which it is installed as tabulated below: 1. 2. 3. A. B.

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