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Home / Assemblies / UL U251
UL U2511.5-hr Fire RatingWallSTC 62
Steel StudMulti-Layer GypsumFiberglass BattResilient ChannelPartitionHigh STCDesign

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

UL-listed 1.5-hour fire-rated steel stud wall assembly. 2-1/2" steel studs at 24" o.c. with R-19 fiberglass batt, 2 layers of 5/8" Type C gypsum board each side on resilient channels.

Cross-Section Diagram

12345677.38"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")
3Resilient channels at 24" o.c.(7/8")
42-1/2" steel studs at 24" o.c.(2.5")
5R-19 fiberglass batt
65/8" Type C gypsum board(5/8")
75/8" Type C gypsum board(5/8")

Specifications

Fire Rating
1.5-Hour
STC Rating
STC 62
Load Bearing
No
Total Thickness
5.875"
Source / Publisher
UL (Underwriters Laboratories)
Design Number
U251
Assembly Type
Wall
Test Standard
UL 263
Construction Group
Light Frame
Number of Layers
7 layers

Applicable Codes

IBC 2021 Table 722.1IRC R302.1

Construction Summary

2-1/2" steel studs at 24" o.c. with R-19 fiberglass batt, 2 layers of 5/8" Type C gypsum board each side on resilient channels

Material Layers

LayerMaterialThickness
15/8" Type C gypsum board5/8"
25/8" Type C gypsum board5/8"
3Resilient channels at 24" o.c.7/8"
42-1/2" steel studs at 24" o.c.2.5"
5R-19 fiberglass batt—
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.