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Home / Assemblies / UL U323
UL U3232-hr Fire RatingWallSTC 60
Steel StudMulti-Layer GypsumResilient ChannelPartitionHigh STCDesign

Shaft Wall — 2 layers 1" Type C on resilient channels

UL-listed 2-hour fire-rated shaft wall assembly. 2-1/2" CT studs at 24" o.c., 2 layers of 1" Shaftliner gypsum board each side on resilient channels.

Cross-Section Diagram

1234567.38"WALL ASSEMBLYSECTION · NOT TO SCALE6 LAYERSsee legend for ① ② ③
Legend
11" Shaftliner gypsum board(1")
21" Shaftliner gypsum board(1")
3Resilient channels at 24" o.c.(7/8")
42-1/2" CT studs at 24" o.c.(2.5")
51" Shaftliner gypsum board(1")
61" Shaftliner gypsum board(1")

Specifications

Fire Rating
2-Hour
STC Rating
STC 60
Load Bearing
No
Total Thickness
7.375"
Source / Publisher
UL (Underwriters Laboratories)
Design Number
U323
Assembly Type
Wall
Test Standard
CAN/ULC-S101
Construction Group
Concrete/Masonry
Number of Layers
6 layers

Applicable Codes

NFPA 5000IBC 2024 §722IBC 2021 §722

Construction Summary

2-1/2" CT studs at 24" o.c., 2 layers of 1" Shaftliner gypsum board each side on resilient channels

Material Layers

LayerMaterialThickness
11" Shaftliner gypsum board1"
21" Shaftliner gypsum board1"
3Resilient channels at 24" o.c.7/8"
42-1/2" CT studs at 24" o.c.2.5"
51" Shaftliner gypsum board1"
61" 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.