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Home / Assemblies / UL U348
UL U3484-hr Fire RatingWallSTC 50
Steel StudMulti-Layer GypsumFiberglass BattPartitionDesign

Shaft Wall — 4 layers 5/8" Type X

UL-listed 4-hour fire-rated shaft wall assembly. 3-5/8" CT studs at 24" o.c. with R-11 fiberglass batt, 4 layers of 5/8" Type X gypsum board each side.

Cross-Section Diagram

1234567891010.13"WALL ASSEMBLYSECTION · NOT TO SCALE10 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")
45/8" Type X gypsum board(5/8")
53-5/8" CT studs at 24" o.c.(3.625")
6R-11 fiberglass batt
75/8" Type X gypsum board(5/8")
85/8" Type X gypsum board(5/8")
95/8" Type X gypsum board(5/8")
105/8" Type X gypsum board(5/8")

Specifications

Fire Rating
4-Hour
STC Rating
STC 50
Load Bearing
No
Total Thickness
8.625"
Source / Publisher
UL (Underwriters Laboratories)
Design Number
U348
Assembly Type
Wall
Test Standard
ASTM E119
Construction Group
Concrete/Masonry
Number of Layers
10 layers

Applicable Codes

IBC 2024 Table 722.1NFPA 5000

Construction Summary

3-5/8" CT studs at 24" o.c. with R-11 fiberglass batt, 4 layers of 5/8" Type X gypsum board each side

Material Layers

LayerMaterialThickness
15/8" Type X gypsum board5/8"
25/8" Type X gypsum board5/8"
35/8" Type X gypsum board5/8"
45/8" Type X gypsum board5/8"
53-5/8" CT studs at 24" o.c.3.625"
6R-11 fiberglass batt—
75/8" Type X gypsum board5/8"
85/8" Type X gypsum board5/8"
95/8" Type X gypsum board5/8"
105/8" 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.