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Home / Assemblies / UL U322
UL U3221.5-hr Fire RatingWallSTC 62
Steel StudMulti-Layer GypsumMineral WoolPartitionHigh STCDesign

Shaft Wall — 2 layers 5/8" Type X

UL-listed 1.5-hour fire-rated shaft wall assembly. 2-1/2" CT studs at 24" o.c. with R-8 mineral wool, 2 layers of 5/8" Type X gypsum board each side.

Cross-Section Diagram

1234566.50"WALL ASSEMBLYSECTION · NOT TO SCALE6 LAYERSsee legend for ① ② ③
Legend
15/8" Type X gypsum board(5/8")
25/8" Type X gypsum board(5/8")
32-1/2" CT studs at 24" o.c.(2.5")
4R-8 mineral wool
55/8" Type X gypsum board(5/8")
65/8" Type X gypsum board(5/8")

Specifications

Fire Rating
1.5-Hour
STC Rating
STC 62
Load Bearing
No
Total Thickness
5"
Source / Publisher
UL (Underwriters Laboratories)
Design Number
U322
Assembly Type
Wall
Test Standard
CAN/ULC-S101
Construction Group
Concrete/Masonry
Number of Layers
6 layers

Applicable Codes

IBC 2021 §722IBC 2024 §722

Construction Summary

2-1/2" CT studs at 24" o.c. with R-8 mineral wool, 2 layers of 5/8" Type X gypsum board each side

Material Layers

LayerMaterialThickness
15/8" Type X gypsum board5/8"
25/8" Type X gypsum board5/8"
32-1/2" CT studs at 24" o.c.2.5"
4R-8 mineral wool—
55/8" Type X gypsum board5/8"
65/8" Type X gypsum board5/8"

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.