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Home / Assemblies / UL U177
UL U1771.5-hr Fire RatingWallLoad-BearingSTC 50
Wood StudGypsum BoardFiberglass BattResilient ChannelLoad-Bearing WallDesign

Wood Stud Wall — single layer 5/8" Type C on resilient channels

UL-listed 1.5-hour fire-rated wood stud wall assembly. 2x6 wood studs at 24" o.c. with R-19 fiberglass batt, single layer of 5/8" Type C gypsum board each side on resilient channels.

Cross-Section Diagram

123459.13"WALL ASSEMBLYSECTION · NOT TO SCALE5 LAYERSsee legend for ① ② ③
Legend
15/8" Type C gypsum board(5/8")
2Resilient channels at 24" o.c.(7/8")
32x6 wood studs at 24" o.c.(5.5")
4R-19 fiberglass batt
55/8" Type C gypsum board(5/8")

Specifications

Fire Rating
1.5-Hour
STC Rating
STC 50
Load Bearing
Yes
Total Thickness
7.625"
Source / Publisher
UL (Underwriters Laboratories)
Design Number
U177
Assembly Type
Wall
Test Standard
UL 263
Construction Group
Light Frame
Number of Layers
5 layers

Applicable Codes

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

Construction Summary

2x6 wood studs at 24" o.c. with R-19 fiberglass batt, single layer of 5/8" Type C gypsum board each side on resilient channels

Material Layers

LayerMaterialThickness
15/8" Type C gypsum board5/8"
2Resilient channels at 24" o.c.7/8"
32x6 wood studs at 24" o.c.5.5"
4R-19 fiberglass batt—
55/8" 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.