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Home / Assemblies / UL U170
UL U1704-hr Fire RatingWallLoad-BearingSTC 50
Wood StudMulti-Layer GypsumFiberglass BattLoad-Bearing WallDesign

Wood Stud Wall — 4 layers 1/2" 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 1/2" Type X gypsum board each side.

Cross-Section Diagram

1234567891011.00"WALL ASSEMBLYSECTION · NOT TO SCALE10 LAYERSsee legend for ① ② ③
Legend
11/2" Type X gypsum board(1/2")
21/2" Type X gypsum board(1/2")
31/2" Type X gypsum board(1/2")
41/2" Type X gypsum board(1/2")
52x6 wood studs at 16" o.c.(5.5")
6R-13 fiberglass batt
71/2" Type X gypsum board(1/2")
81/2" Type X gypsum board(1/2")
91/2" Type X gypsum board(1/2")
101/2" Type X gypsum board(1/2")

Specifications

Fire Rating
4-Hour
STC Rating
STC 50
Load Bearing
Yes
Total Thickness
9.5"
Source / Publisher
UL (Underwriters Laboratories)
Design Number
U170
Assembly Type
Wall
Test Standard
CAN/ULC-S101
Construction Group
Light Frame
Number of Layers
10 layers

Applicable Codes

NFPA 5000IBC 2021 Table 722.1

Construction Summary

2x6 wood studs at 16" o.c. with R-13 fiberglass batt, 4 layers of 1/2" Type X gypsum board each side

Material Layers

LayerMaterialThickness
11/2" Type X gypsum board1/2"
21/2" Type X gypsum board1/2"
31/2" Type X gypsum board1/2"
41/2" Type X gypsum board1/2"
52x6 wood studs at 16" o.c.5.5"
6R-13 fiberglass batt—
71/2" Type X gypsum board1/2"
81/2" Type X gypsum board1/2"
91/2" Type X gypsum board1/2"
101/2" Type X gypsum board1/2"

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.