UL Design L512

1-Hour Fire Rated One-hour wood joist floor-ceiling

UL Design L512 — One-hour wood joist floor-ceiling. Nominal 2x10 wood joists spaced 16 in. o.c. carry a 15/32 in. wood structural panel subfloor topped with either 3/4 in. gypsum floor topping or 19/32 in. wood structural panels. The ceiling membrane is one layer of 5/8 in. Type X gypsum board (National Gypsum 5/8 in. Fire-Shield) applied to the underside of the joists. STC 37 per manufacturer listing. IIC 32 bare / 66 with carpet and pad per National Gypsum literature.

One-hour wood joist floor-ceiling. Nominal 2x10 wood joists spaced 16 in.

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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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