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Home / Assemblies / UL U223
UL U2231.5-hr Fire RatingWallSTC 47
Steel StudGypsum BoardFiberglass BattPartitionDesign

Steel Stud Wall — single layer 5/8" Type X

UL-listed 1.5-hour fire-rated steel stud wall assembly. 3-5/8" steel studs at 16" o.c. with R-19 fiberglass batt, single layer of 5/8" Type X gypsum board each side.

Cross-Section Diagram

12346.38"WALL ASSEMBLYSECTION · NOT TO SCALE4 LAYERSsee legend for ① ② ③
Legend
15/8" Type X gypsum board(5/8")
23-5/8" steel studs at 16" o.c.(3.625")
3R-19 fiberglass batt
45/8" Type X gypsum board(5/8")

Specifications

Fire Rating
1.5-Hour
STC Rating
STC 47
Load Bearing
No
Total Thickness
4.875"
Source / Publisher
UL (Underwriters Laboratories)
Design Number
U223
Assembly Type
Wall
Test Standard
CAN/ULC-S101
Construction Group
Light Frame
Number of Layers
4 layers

Applicable Codes

IRC R302.1IBC 2024 §722

Construction Summary

3-5/8" steel studs at 16" o.c. with R-19 fiberglass batt, single layer of 5/8" Type X gypsum board each side

Material Layers

LayerMaterialThickness
15/8" Type X gypsum board5/8"
23-5/8" steel studs at 16" o.c.3.625"
3R-19 fiberglass batt—
45/8" 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.