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Home / Assemblies / UL U165
UL U1653-hr Fire RatingWallLoad-BearingSTC 43
Wood StudMulti-Layer GypsumLoad-Bearing WallDesign

Wood Stud Wall — 3 layers 5/8" Type C

UL-listed 3-hour fire-rated wood stud wall assembly. 2x6 wood studs at 16" o.c., 3 layers of 5/8" Type C gypsum board each side.

Cross-Section Diagram

12345679.25"WALL ASSEMBLYSECTION · NOT TO SCALE7 LAYERSsee legend for ① ② ③
Legend
15/8" Type C gypsum board(5/8")
25/8" Type C gypsum board(5/8")
35/8" Type C gypsum board(5/8")
42x6 wood studs at 16" o.c.(5.5")
55/8" Type C gypsum board(5/8")
65/8" Type C gypsum board(5/8")
75/8" Type C gypsum board(5/8")

Specifications

Fire Rating
3-Hour
STC Rating
STC 43
Load Bearing
Yes
Total Thickness
9.25"
Source / Publisher
UL (Underwriters Laboratories)
Design Number
U165
Assembly Type
Wall
Test Standard
CAN/ULC-S101
Construction Group
Light Frame
Number of Layers
7 layers

Applicable Codes

IBC 2021 §722IBC 2024 §722

Construction Summary

2x6 wood studs at 16" o.c., 3 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"
35/8" Type C gypsum board5/8"
42x6 wood studs at 16" o.c.5.5"
55/8" Type C gypsum board5/8"
65/8" Type C gypsum board5/8"
75/8" 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.