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Home / Assemblies / UL U115
UL U1153-hr Fire RatingWallLoad-BearingSTC 45
Wood StudMulti-Layer GypsumFiberglass BattLoad-Bearing WallDesign

Wood Stud Wall — 3 layers 5/8" Type X

UL-listed 3-hour fire-rated wood stud wall assembly. 2x4 wood studs at 16" o.c. with R-13 fiberglass batt, 3 layers of 5/8" Type X gypsum board each side.

Cross-Section Diagram

123456788.75"WALL ASSEMBLYSECTION · NOT TO SCALE8 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")
42x4 wood studs at 16" o.c.(3.5")
5R-13 fiberglass batt
65/8" Type X gypsum board(5/8")
75/8" Type X gypsum board(5/8")
85/8" Type X gypsum board(5/8")

Specifications

Fire Rating
3-Hour
STC Rating
STC 45
Load Bearing
Yes
Total Thickness
7.25"
Source / Publisher
UL (Underwriters Laboratories)
Design Number
U115
Assembly Type
Wall
Test Standard
CAN/ULC-S101
Construction Group
Light Frame
Number of Layers
8 layers

Applicable Codes

IRC R302.1IBC 2024 §722IBC 2024 Table 722.1

Construction Summary

2x4 wood studs at 16" o.c. with R-13 fiberglass batt, 3 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"
42x4 wood studs at 16" o.c.3.5"
5R-13 fiberglass batt—
65/8" Type X gypsum board5/8"
75/8" Type X gypsum board5/8"
85/8" 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.