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Home / Assemblies / UL U155
UL U1551.5-hr Fire RatingWallLoad-BearingSTC 57
Wood StudMulti-Layer GypsumFiberglass BattLoad-Bearing WallHigh STCDesign

Wood Stud Wall — 2 layers 1/2" Type X

UL-listed 1.5-hour fire-rated wood stud wall assembly. 2x6 wood studs at 16" o.c. with R-13 fiberglass batt, 2 layers of 1/2" Type X gypsum board each side.

Cross-Section Diagram

1234569.00"WALL ASSEMBLYSECTION · NOT TO SCALE6 LAYERSsee legend for ① ② ③
Legend
11/2" Type X gypsum board(1/2")
21/2" Type X gypsum board(1/2")
32x6 wood studs at 16" o.c.(5.5")
4R-13 fiberglass batt
51/2" Type X gypsum board(1/2")
61/2" Type X gypsum board(1/2")

Specifications

Fire Rating
1.5-Hour
STC Rating
STC 57
Load Bearing
Yes
Total Thickness
7.5"
Source / Publisher
UL (Underwriters Laboratories)
Design Number
U155
Assembly Type
Wall
Test Standard
UL 263
Construction Group
Light Frame
Number of Layers
6 layers

Applicable Codes

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

Construction Summary

2x6 wood studs at 16" o.c. with R-13 fiberglass batt, 2 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"
32x6 wood studs at 16" o.c.5.5"
4R-13 fiberglass batt—
51/2" Type X gypsum board1/2"
61/2" 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.