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Home / Assemblies / UL U169
UL U1694-hr Fire RatingWallLoad-BearingSTC 55
Wood StudMulti-Layer GypsumFiberglass BattLoad-Bearing WallHigh STCDesign

Wood Stud Wall — 4 layers 5/8" Type X

UL-listed 4-hour fire-rated wood stud wall assembly. 2x6 wood studs at 16" o.c. with R-13 fiberglass batt, 4 layers of 5/8" Type X gypsum board each side.

Cross-Section Diagram

1234567891012.00"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")
52x6 wood studs at 16" o.c.(5.5")
6R-13 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 55
Load Bearing
Yes
Total Thickness
10.5"
Source / Publisher
UL (Underwriters Laboratories)
Design Number
U169
Assembly Type
Wall
Test Standard
ASTM E119
Construction Group
Light Frame
Number of Layers
10 layers

Applicable Codes

IBC 2021 Table 722.1IBC 2021 §722IBC 2024 Table 722.1

Construction Summary

2x6 wood studs at 16" o.c. with R-13 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"
52x6 wood studs at 16" o.c.5.5"
6R-13 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.