Typical assembly (not a tested listing)

4-Hour Fire Rated Steel Joist Floor/Ceiling — 3 layers 5/8" Type X gypsum board

Typical 4-hour fire-rated steel joist floor/ceiling assembly. Open-web steel joists at 24" o.c. with R-19 fiberglass batt, 3 layers of 5/8" Type X gypsum board ceiling. Illustrative example of typical construction — not a tested UL or GA listing. Use a listed design (UL Product iQ or GA-600) for construction documents.

Open-web steel joists at 24" o.c. with R-19 fiberglass batt, 3 layers of 5/8" Type X gypsum board ceiling

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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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