UL Design D759
2-Hour Fire Rated Concrete on Steel Deck Floor — sprayed deck and beam
UL Design D759 — floor-ceiling: normal-weight or lightweight 3000 psi concrete on 1-1/2" to 3" fluted (min 22 MSG) or cellular (min 20/20 MSG) steel floor units on min W8x28 beams or 12K5 joists; deck underside AND beam sprayed with SFRM. Restrained 1–2 hr: deck = 3/8"; 3 hr: 13/16" fluted. Beam by unrestrained rating: 1 hr = 5/16", 2 hr = 11/16", 3 hr = 1-1/16" (cellular/blend slightly thicker).
Concrete on steel deck, SFRM on deck underside and beam, thickness by rating
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- Layer-by-layer components with thicknesses
- Cross-section diagram
- Applicable code sections and test standard
- 6 related assemblies