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Fire Rated Wall Assembly Guide

This document summarizes the fire resistance ratings and details of a firestop system from Underwriters Laboratories (UL). It received a F Rating of 1 or 2 hours, matching the wall assembly it is installed within. The system allows for penetrations of various metal pipes or conduits up to 30 inches in diameter through gypsum wallboard walls. A sealant is applied around and between the penetration and wall to prevent fire and smoke from spreading. It was classified by UL according to their testing standards.

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1K views1 page

Fire Rated Wall Assembly Guide

This document summarizes the fire resistance ratings and details of a firestop system from Underwriters Laboratories (UL). It received a F Rating of 1 or 2 hours, matching the wall assembly it is installed within. The system allows for penetrations of various metal pipes or conduits up to 30 inches in diameter through gypsum wallboard walls. A sealant is applied around and between the penetration and wall to prevent fire and smoke from spreading. It was classified by UL according to their testing standards.

Uploaded by

shama093
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
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Download as PDF, TXT or read online on Scribd
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US

F Ratings -- 1 and 2 Hr (See Item 1)


T Rating -- 0 Hr
L Rating at Ambient -- Less than 1 CFM/Sq Ft

Classified by
Underwriters Laboratories, Inc.
to UL 1479 and CAN/ULC-S115

WL 1297

CL

System No. W-L-1297

ED

S IFI
AS

1. Wall Assembly The 1 or 2 hr fire rated gypsum board/stud wall assembly shall be constructed of the materials and in the manner specified in
the individual U300, U400 or V400 Series Wall and Partition Designs in the UL Fire Resistance Directory and shall include the following
construction features.
A. Studs Wall framing shall consist of either wood studs or steel channel studs. Wood studs to consist of nom 2 by 4 in. (51 by 102 mm)
lumber spaced 16 in. (406 mm) OC. Steel studs to be min 2-1/2 in. (64 mm) wide and spaced max 24 in. (610 mm) OC.
B. Gypsum Board* Nom 5/8 in. (16 mm) thick, 4 ft (1.22 m) wide with square or tapered edges. The gypsum board type, thickness, number of
layers, fastener type and sheet orientation shall be as specified in the individual U300, U400 or V400 Series Design in the Fire Resistance
Directory. Max diam of opening is 32 in. (813 mm).
The hourly F Rating of the firestop system is equal to the hourly fire rating of the wall assembly in which it is installed.
2. Through Penetrant One metallic pipe, conduit or tubing installed concentrically or eccentrically within the firestop system. Pipe, conduit or tube
to be rigidly supported on both sides of wall assembly. The annular space between the pipe, conduit or tube and periphery of the opening shall be
min 0 in (0 mm, point contact) to max 2 in. (51 mm) in 2 hr fire rated walls and min 0 in (0 mm, point contact) to max 1 in. (25 mm) in 1 hr fire rated
walls. The following types and sizes of metallic pipes, conduit or tube may be used:
A. Steel Pipe Nom 30 in. (762 mm) diam (or smaller) Schedule 40 (or heavier) steel pipe.
B. Iron Pipe Nom 30 in. (762 mm) diam (or smaller) cast or ductile iron pipe.
C. Conduit Nom 4 in. (102 mm) diam (or smaller) steel electrical metallic tubing (EMT) or 6 in. diam steel conduit.
D. Copper Tube Nom 6 in. (152 mm) diam (or smaller) Type L (or heavier) copper tube.
E. Copper Pipe Nom 6 in. (152 mm) diam (or smaller) Regular (or heavier) copper pipe.
3. Fill, Void or Cavity Material*-Sealant Min 5/8 in. (16 mm) or 1-1/4 in. (32 mm) thickness of fill material applied within the annulus, flush with
both surfaces of wall, for 1 hr and 2 hr fire rated wall assemblies, respectively. A min 1/2 in. (13 mm) diam bead of fill material shall be applied at
the pipe/wall interface at the point contact location.
HILTI CONSTRUCTION CHEMICALS, DIV OF HILTI INC CP606 Flexible Firestop Sealant
* Indicates such products shall bear the UL or cUL Certification Mark for jurisdictions employing the UL or cUL Certification (such as Canada),
respectively.

Hilti Firestop Systems

Reproduced by HILTI, Inc. Courtesy of


Underwriters Laboratories, Inc.
October 14, 2015

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