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Home / Assemblies / UL U330
UL U3304-hr Fire RatingWallSTC 64
Steel StudMulti-Layer GypsumMineral WoolResilient ChannelPartitionHigh STCDesign

Shaft Wall — 3 layers 5/8" Type X on resilient channels

UL-listed 4-hour fire-rated shaft wall assembly. 2-1/2" CT studs at 24" o.c. with R-8 mineral wool, 3 layers of 5/8" Type X gypsum board each side on resilient channels.

Cross-Section Diagram

1234567898.63"WALL ASSEMBLYSECTION · NOT TO SCALE9 LAYERSsee legend for ① ② ③
Legend
15/8" Type X gypsum board(5/8")
25/8" Type X gypsum board(5/8")
35/8" Type X gypsum board(5/8")
4Resilient channels at 24" o.c.(7/8")
52-1/2" CT studs at 24" o.c.(2.5")
6R-8 mineral wool
75/8" Type X gypsum board(5/8")
85/8" Type X gypsum board(5/8")
95/8" Type X gypsum board(5/8")

Specifications

Fire Rating
4-Hour
STC Rating
STC 64
Load Bearing
No
Total Thickness
7.125"
Source / Publisher
UL (Underwriters Laboratories)
Design Number
U330
Assembly Type
Wall
Test Standard
CAN/ULC-S101
Construction Group
Concrete/Masonry
Number of Layers
9 layers

Applicable Codes

IBC 2024 Table 722.1IRC R302.1

Construction Summary

2-1/2" CT studs at 24" o.c. with R-8 mineral wool, 3 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"
35/8" Type X gypsum board5/8"
4Resilient channels at 24" o.c.7/8"
52-1/2" CT studs at 24" o.c.2.5"
6R-8 mineral wool—
75/8" Type X gypsum board5/8"
85/8" Type X gypsum board5/8"
95/8" 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.