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Home / Assemblies / UL U221
UL U2211-hr Fire RatingWallSTC 45
Steel StudGypsum BoardFiberglass BattPartitionDesign

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

UL-listed 1-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 C gypsum board each side.

Cross-Section Diagram

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

Specifications

Fire Rating
1-Hour
STC Rating
STC 45
Load Bearing
No
Total Thickness
4.875"
Source / Publisher
UL (Underwriters Laboratories)
Design Number
U221
Assembly Type
Wall
Test Standard
CAN/ULC-S101
Construction Group
Light Frame
Number of Layers
4 layers

Applicable Codes

IBC 2021 §722IBC 2024 §722IRC R302.1

Construction Summary

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

Material Layers

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