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Home / Assemblies / UL U347
UL U3474-hr Fire RatingWallSTC 53
Steel StudMulti-Layer GypsumResilient ChannelPartitionDesign

Shaft Wall — 4 layers 1" Type C on resilient channels

UL-listed 4-hour fire-rated shaft wall assembly. 3-5/8" CT studs at 24" o.c., 4 layers of 1" Shaftliner gypsum board each side on resilient channels.

Cross-Section Diagram

1234567891012.50"WALL ASSEMBLYSECTION · NOT TO SCALE10 LAYERSsee legend for ① ② ③
Legend
11" Shaftliner gypsum board(1")
21" Shaftliner gypsum board(1")
31" Shaftliner gypsum board(1")
41" Shaftliner gypsum board(1")
5Resilient channels at 24" o.c.(7/8")
63-5/8" CT studs at 24" o.c.(3.625")
71" Shaftliner gypsum board(1")
81" Shaftliner gypsum board(1")
91" Shaftliner gypsum board(1")
101" Shaftliner gypsum board(1")

Specifications

Fire Rating
4-Hour
STC Rating
STC 53
Load Bearing
No
Total Thickness
12.5"
Source / Publisher
UL (Underwriters Laboratories)
Design Number
U347
Assembly Type
Wall
Test Standard
ASTM E119
Construction Group
Concrete/Masonry
Number of Layers
10 layers

Applicable Codes

IRC R302.1IBC 2021 §722IBC 2024 Table 722.1

Construction Summary

3-5/8" CT studs at 24" o.c., 4 layers of 1" Shaftliner gypsum board each side on resilient channels

Material Layers

LayerMaterialThickness
11" Shaftliner gypsum board1"
21" Shaftliner gypsum board1"
31" Shaftliner gypsum board1"
41" Shaftliner gypsum board1"
5Resilient channels at 24" o.c.7/8"
63-5/8" CT studs at 24" o.c.3.625"
71" Shaftliner gypsum board1"
81" Shaftliner gypsum board1"
91" Shaftliner gypsum board1"
101" Shaftliner gypsum board1"

Important Notice

This assembly listing is for reference only. Always verify against the current UL Product iQ database before specifying in construction documents. Material substitutions may void the fire rating. Consult with a qualified fire protection engineer for project-specific requirements.