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Home / Assemblies / UL U189
UL U1893-hr Fire RatingWallLoad-BearingSTC 57
Wood StudMulti-Layer GypsumMineral WoolResilient ChannelLoad-Bearing WallHigh STCDesign

Wood Stud Wall — 3 layers 5/8" Type C 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, 3 layers of 5/8" Type C gypsum board each side on resilient channels.

Cross-Section Diagram

12345678911.63"WALL ASSEMBLYSECTION · NOT TO SCALE9 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")
4Resilient channels at 24" o.c.(7/8")
52x6 wood studs at 24" o.c.(5.5")
6R-21 mineral wool batt
75/8" Type C gypsum board(5/8")
85/8" Type C gypsum board(5/8")
95/8" Type C gypsum board(5/8")

Specifications

Fire Rating
3-Hour
STC Rating
STC 57
Load Bearing
Yes
Total Thickness
10.125"
Source / Publisher
UL (Underwriters Laboratories)
Design Number
U189
Assembly Type
Wall
Test Standard
ASTM E119
Construction Group
Light Frame
Number of Layers
9 layers

Applicable Codes

IBC 2024 Table 722.1NFPA 5000

Construction Summary

2x6 wood studs at 24" o.c. with R-21 mineral wool batt, 3 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"
35/8" Type C gypsum board5/8"
4Resilient channels at 24" o.c.7/8"
52x6 wood studs at 24" o.c.5.5"
6R-21 mineral wool batt—
75/8" Type C gypsum board5/8"
85/8" Type C gypsum board5/8"
95/8" 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.