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Home / Assemblies / UL U345
UL U3454-hr Fire RatingWallSTC 50
Steel StudMulti-Layer GypsumPartitionDesign

Shaft Wall — 3 layers 1" Type C

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

Cross-Section Diagram

12345679.63"WALL ASSEMBLYSECTION · NOT TO SCALE7 LAYERSsee legend for ① ② ③
Legend
11" Shaftliner gypsum board(1")
21" Shaftliner gypsum board(1")
31" Shaftliner gypsum board(1")
43-5/8" CT studs at 24" o.c.(3.625")
51" Shaftliner gypsum board(1")
61" Shaftliner gypsum board(1")
71" Shaftliner gypsum board(1")

Specifications

Fire Rating
4-Hour
STC Rating
STC 50
Load Bearing
No
Total Thickness
9.625"
Source / Publisher
UL (Underwriters Laboratories)
Design Number
U345
Assembly Type
Wall
Test Standard
CAN/ULC-S101
Construction Group
Concrete/Masonry
Number of Layers
7 layers

Applicable Codes

IBC 2024 Table 722.1NFPA 5000

Construction Summary

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

Material Layers

LayerMaterialThickness
11" Shaftliner gypsum board1"
21" Shaftliner gypsum board1"
31" Shaftliner gypsum board1"
43-5/8" CT studs at 24" o.c.3.625"
51" Shaftliner gypsum board1"
61" Shaftliner gypsum board1"
71" 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.