Typical assembly (not a tested listing)
4-Hour Fire Rated Wood Joist Floor/Ceiling — 3 layers 5/8" Type X gypsum board
Typical 4-hour fire-rated wood joist floor/ceiling assembly. 2x12 wood joists at 16" o.c., 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.
2x12 wood joists at 16" o.c., 3 layers of 5/8" Type X gypsum board ceiling
The full text is for BuildSpec members
Read the complete section, search across every adopted code, run the calculators and ask Copilot — free for 14 days, no card required.
- Layer-by-layer components with thicknesses
- Cross-section diagram
- Applicable code sections and test standard
- 6 related assemblies