UL Design D902
2-Hour Fire Rated Concrete on Steel Deck Floor — unprotected deck, SFRM beam
UL Design D902 — floor-ceiling: concrete slab on composite 1-1/2" to 3" fluted/cellular steel floor units (min 22 MSG) on min W8x28 beams (or 8K1/12K5 joists); only the beam is sprayed. Concrete thickness sets the restrained rating: normal weight 3-1/2" = 1 hr, 4-1/2" = 2 hr, 5-1/4" = 3 hr; lightweight 2-1/2" = 1 hr, 3-1/4" = 2 hr. Beam SFRM (fluted deck, NW): 2 hr = 3/4", 3 hr = 1-3/16" (Isolatek D-C/F, HP, II families).
Concrete on composite steel deck, unprotected deck, SFRM on supporting beam only
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- Layer-by-layer components with thicknesses
- Cross-section diagram
- Applicable code sections and test standard
- 6 related assemblies