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Home / Assemblies / UL U284
UL U2843-hr Fire RatingWallSTC 45
Steel StudMulti-Layer GypsumPartitionDesign

Steel Stud Wall — 3 layers 5/8" Type C

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

Cross-Section Diagram

12345679.75"WALL ASSEMBLYSECTION · NOT TO SCALE7 LAYERSsee legend for ① ② ③
Legend
15/8" Type C gypsum board(5/8")
25/8" Type C gypsum board(5/8")
35/8" Type C gypsum board(5/8")
46" steel studs at 24" o.c.(6.0")
55/8" Type C gypsum board(5/8")
65/8" Type C gypsum board(5/8")
75/8" Type C gypsum board(5/8")

Specifications

Fire Rating
3-Hour
STC Rating
STC 45
Load Bearing
No
Total Thickness
9.75"
Source / Publisher
UL (Underwriters Laboratories)
Design Number
U284
Assembly Type
Wall
Test Standard
ASTM E119
Construction Group
Light Frame
Number of Layers
7 layers

Applicable Codes

IBC 2021 Table 722.1IBC 2024 Table 722.1IRC R302.1

Construction Summary

6" steel studs at 24" o.c., 3 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"
35/8" Type C gypsum board5/8"
46" steel studs at 24" o.c.6.0"
55/8" Type C gypsum board5/8"
65/8" Type C gypsum board5/8"
75/8" 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.