UL Design U425
1-Hour Fire Rated Load-Bearing Steel Stud Wall — tested STC
UL Design U425 — load-bearing steel stud wall. 1-hour: one layer of 5/8" Type X each side with 3-1/2" insulation, tested STC 48 (OL12-0922). 2-hour: two layers of 5/8" Type X each side, tested STC 54 (OL12-0924). Per CertainTeed Fire Resistance and Sound Control Design Manual.
Load-bearing steel studs, 5/8" Type X each side, 3-1/2" insulation; STC 48 (1-hr) / 54 (2-hr)
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- Layer-by-layer components with thicknesses
- Cross-section diagram
- Applicable code sections and test standard
- 6 related assemblies