UL Design L501
1-Hour Fire Rated Wood Joist Floor-Ceiling — 5/8" gypsum ceiling, 2x10 @ 16" o.c.
UL Design L501 — 1-hour wood joist floor-ceiling. Minimum nominal 2x10 wood joists at 16" o.c. with bridging, subfloor of 1x6 T&G lumber laid diagonally or min 15/32" plywood / 7/16" OSB, with about 22 listed finish-floor options above (wood flooring to 3/4"–1-1/2" poured toppings). Ceiling of 5/8" gypsum board perpendicular to joists, 6d cement-coated nails at 6" o.c. Finish ratings 16–26 min by option. Acoustics per National Gypsum (NGC 4024): STC 37, IIC 32 bare / 66 with carpet and pad.
2x10 wood joists @ 16" o.c., plywood subfloor + finish floor, 5/8" gypsum board ceiling
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- Layer-by-layer components with thicknesses
- Cross-section diagram
- Applicable code sections and test standard
- 6 related assemblies