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Home / Assemblies / UL U108
UL U1081.5-hr Fire RatingWallLoad-BearingSTC 54
Wood StudMulti-Layer GypsumFiberglass BattLoad-Bearing WallDesign

Wood Stud Wall — 2 layers 5/8" Type C

UL-listed 1.5-hour fire-rated wood stud wall assembly. 2x4 wood studs at 16" o.c. with R-13 fiberglass batt, 2 layers of 5/8" Type C gypsum board each side.

Cross-Section Diagram

1234567.50"WALL ASSEMBLYSECTION · NOT TO SCALE6 LAYERSsee legend for ① ② ③
Legend
15/8" Type C gypsum board(5/8")
25/8" Type C gypsum board(5/8")
32x4 wood studs at 16" o.c.(3.5")
4R-13 fiberglass batt
55/8" Type C gypsum board(5/8")
65/8" Type C gypsum board(5/8")

Specifications

Fire Rating
1.5-Hour
STC Rating
STC 54
Load Bearing
Yes
Total Thickness
6"
Source / Publisher
UL (Underwriters Laboratories)
Design Number
U108
Assembly Type
Wall
Test Standard
UL 263
Construction Group
Light Frame
Number of Layers
6 layers

Applicable Codes

IRC R302.1IBC 2024 §722

Construction Summary

2x4 wood studs at 16" o.c. with R-13 fiberglass batt, 2 layers of 5/8" Type C gypsum board each side

Material Layers

LayerMaterialThickness
15/8" Type C gypsum board5/8"
25/8" Type C gypsum board5/8"
32x4 wood studs at 16" o.c.3.5"
4R-13 fiberglass batt—
55/8" Type C gypsum board5/8"
65/8" 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.