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Home / Assemblies / UL U338
UL U3381.5-hr Fire RatingWallSTC 52
Steel StudMulti-Layer GypsumMineral WoolPartitionDesign

Shaft Wall — 2 layers 5/8" Type X

UL-listed 1.5-hour fire-rated shaft wall assembly. 3-5/8" 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

1234567.63"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")
33-5/8" CT studs at 24" o.c.(3.625")
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 52
Load Bearing
No
Total Thickness
6.125"
Source / Publisher
UL (Underwriters Laboratories)
Design Number
U338
Assembly Type
Wall
Test Standard
UL 263
Construction Group
Concrete/Masonry
Number of Layers
6 layers

Applicable Codes

IBC 2024 §722NFPA 5000

Construction Summary

3-5/8" 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"
33-5/8" CT studs at 24" o.c.3.625"
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.