UL Design S721

2-Hour Fire Rated Steel Roof Beam — SFRM, min W6x16

UL Design S721 — roof beam/joist design: min W6x16 steel beam or 10K1/12K3/14K1 joists supporting min 22 MSG, 1-1/2" fluted steel roof deck with insulation and Class A/B/C covering; beam and deck sprayed with SFRM, crests above the beam filled. W6x16 unrestrained: 1 hr = 7/16", 1-1/2 hr = 9/16", 2 hr = 13/16", 3 hr = 1-1/4", 4 hr = 1-1/2" (4 hr beam only). Joists require greater thickness.

Min W6x16 roof beam under fluted deck, SFRM by rating, crests filled

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  • Layer-by-layer components with thicknesses
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  • 6 related assemblies
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