UL Design N743
2-Hour Fire Rated Steel Floor Beam — SFRM, min W8x28
UL Design N743 — floor beam: min W8x28 steel beam supporting 1-1/2" to 3" fluted, cellular or corrugated steel floor units with normal-weight or lightweight concrete; beam contour-sprayed with SFRM, deck crests above the beam filled. Fluted deck, NW concrete, unrestrained beam: 1 hr = 3/8", 1-1/2 hr = 9/16", 2 hr = 3/4", 3 hr = 1-3/16", 4 hr = 1-5/8". Thicker tables apply for lightweight concrete and cellular deck.
Min W8x28 beam under concrete-on-steel-deck floor, contour SFRM by rating
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- Layer-by-layer components with thicknesses
- Cross-section diagram
- Applicable code sections and test standard
- 6 related assemblies