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Home / Assemblies / UL U281
UL U2813-hr Fire RatingWallLoad-BearingSTC 48
Steel StudMulti-Layer GypsumFiberglass BattLoad-Bearing WallDesign

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

UL-listed 3-hour fire-rated steel stud wall assembly. 6" steel studs at 24" o.c. with R-19 fiberglass batt, 2 layers of 5/8" Type C gypsum board each side.

Cross-Section Diagram

12345610.00"WALL ASSEMBLYSECTION · NOT TO SCALE6 LAYERSsee legend for ① ② ③
Legend
15/8" Type C gypsum board(5/8")
25/8" Type C gypsum board(5/8")
36" steel studs at 24" o.c.(6.0")
4R-19 fiberglass batt
55/8" Type C gypsum board(5/8")
65/8" Type C gypsum board(5/8")

Specifications

Fire Rating
3-Hour
STC Rating
STC 48
Load Bearing
Yes
Total Thickness
8.5"
Source / Publisher
UL (Underwriters Laboratories)
Design Number
U281
Assembly Type
Wall
Test Standard
UL 263
Construction Group
Light Frame
Number of Layers
6 layers

Applicable Codes

IBC 2024 Table 722.1NFPA 5000IRC R302.1

Construction Summary

6" steel studs at 24" o.c. with R-19 fiberglass batt, 2 layers of 5/8" Type C gypsum board each side

Material Layers

LayerMaterialThickness
15/8" Type C gypsum board5/8"
25/8" Type C gypsum board5/8"
36" steel studs at 24" o.c.6.0"
4R-19 fiberglass batt—
55/8" Type C gypsum board5/8"
65/8" 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.