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Home / Assemblies / UL U229
UL U2292-hr Fire RatingWallSTC 57
Steel StudMulti-Layer GypsumFiberglass BattPartitionHigh STCDesign

Steel Stud Wall — 2 layers 5/8" Type X

UL-listed 2-hour fire-rated steel stud wall assembly. 3-5/8" steel studs at 16" o.c. with R-11 fiberglass batt, 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" steel studs at 16" o.c.(3.625")
4R-11 fiberglass batt
55/8" Type X gypsum board(5/8")
65/8" Type X gypsum board(5/8")

Specifications

Fire Rating
2-Hour
STC Rating
STC 57
Load Bearing
No
Total Thickness
6.125"
Source / Publisher
UL (Underwriters Laboratories)
Design Number
U229
Assembly Type
Wall
Test Standard
CAN/ULC-S101
Construction Group
Light Frame
Number of Layers
6 layers

Applicable Codes

IRC R302.1IBC 2024 Table 722.1NFPA 5000

Construction Summary

3-5/8" steel studs at 16" o.c. with R-11 fiberglass batt, 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" steel studs at 16" o.c.3.625"
4R-11 fiberglass batt—
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.