UL Design L515

1-Hour Fire Rated Wood Joist Floor-Ceiling — resilient channels, 1/2" Type C

UL Design L515 (cross-listed FM FC 181) — 1-hour wood joist floor-ceiling with the ceiling of 1/2" Type C gypsum board screw-attached to resilient furring channels at 24" o.c. Acoustics per National Gypsum: STC 45 (est. 50 with insulation), IIC 39 bare / 63 with carpet and pad (NGC 4010/4107/5161/5165).

2x10 joists, subfloor + finish floor, resilient channels @ 24" o.c., 1/2" Type C ceiling; STC 45, IIC 39

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  • Layer-by-layer components with thicknesses
  • Cross-section diagram
  • Applicable code sections and test standard
  • 6 related assemblies
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