UL Design L522
1-Hour Fire Rated Wood Joist Floor-Ceiling — 1/2" Type C nailed direct
UL Design L522 (cross-listed GA FC 5410) — 1-hour wood joist floor-ceiling with a ceiling of 1/2" Type C gypsum board nail-attached directly to 2x10 wood joists. Acoustics per National Gypsum: STC 37, IIC 32 bare / 66 with carpet and pad (NGC 4042/5032A/5033).
2x10 joists @ 16" o.c., subfloor + finish floor, 1/2" Type C ceiling nailed direct; STC 37, IIC 32
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- Layer-by-layer components with thicknesses
- Cross-section diagram
- Applicable code sections and test standard
- 6 related assemblies