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Home / Assemblies / UL U184
UL U1843-hr Fire RatingWallLoad-BearingSTC 70
Wood StudMulti-Layer GypsumMineral WoolResilient ChannelLoad-Bearing WallHigh STCDesign

Wood Stud Wall — 2 layers 5/8" Type X on resilient channels

UL-listed 3-hour fire-rated wood stud wall assembly. 2x6 wood studs at 24" o.c. with R-21 mineral wool batt, 2 layers of 5/8" Type X gypsum board each side on resilient channels.

Cross-Section Diagram

123456710.38"WALL ASSEMBLYSECTION · NOT TO SCALE7 LAYERSsee legend for ① ② ③
Legend
15/8" Type X gypsum board(5/8")
25/8" Type X gypsum board(5/8")
3Resilient channels at 24" o.c.(7/8")
42x6 wood studs at 24" o.c.(5.5")
5R-21 mineral wool batt
65/8" Type X gypsum board(5/8")
75/8" Type X gypsum board(5/8")

Specifications

Fire Rating
3-Hour
STC Rating
STC 70
Load Bearing
Yes
Total Thickness
8.875"
Source / Publisher
UL (Underwriters Laboratories)
Design Number
U184
Assembly Type
Wall
Test Standard
UL 263
Construction Group
Light Frame
Number of Layers
7 layers

Applicable Codes

IBC 2024 Table 722.1

Construction Summary

2x6 wood studs at 24" o.c. with R-21 mineral wool batt, 2 layers of 5/8" Type X gypsum board each side on resilient channels

Material Layers

LayerMaterialThickness
15/8" Type X gypsum board5/8"
25/8" Type X gypsum board5/8"
3Resilient channels at 24" o.c.7/8"
42x6 wood studs at 24" o.c.5.5"
5R-21 mineral wool batt—
65/8" Type X gypsum board5/8"
75/8" Type X 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.