Illustrative typical assembly — not a tested listing
4-Hour Fire Rated Wood Stud Wall — 3 layers 5/8" Type C · 2x4 wood studs at 16" o.c.
Typical 4-hour fire-rated wood stud wall assembly. 2x4 wood studs at 16" o.c. with R-13 fiberglass batt, 3 layers of 5/8" Type C gypsum board each side. 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. This is an illustrative example of typical construction, not a tested UL or GA listing, and it carries no design number a plan reviewer can rely on. For construction documents, use a listed design.
- Reference number
- BS-W021 (BuildSpec, not a listing)
- Fire rating
- 4-Hour
- Assembly type
- wall
- Test standard
- Not a tested listing — illustrative
- BS-W0194-Hour · Wood Stud Wall — 3 layers 5/8" Type X · 2x4 wood studs at 16" o.c.
- BS-W0204-Hour · Wood Stud Wall — 3 layers 1/2" Type X on resilient channels
- BS-W0224-Hour · Wood Stud Wall — 4 layers 5/8" Type X · 2x4 wood studs at 16" o.c.
- BS-W0234-Hour · Wood Stud Wall — 4 layers 1/2" Type X on resilient channels
- BS-W0244-Hour · Wood Stud Wall — 4 layers 5/8" Type C · 2x4 wood studs at 16" o.c.
- BS-W0434-Hour · Wood Stud Wall — 3 layers 5/8" Type X · 2x4 wood studs at 24" o.c.
- IBC 2021 §703.2 (fire-resistance ratings by test or calculation)
- IRC 2021 §R302 (fire-resistant construction, where the IRC applies)
See how BS-W021 is built, layer by layer
Members see every layer with its thickness, the cross-section diagram, alternates, exports and project bookmarks.
- Layer-by-layer components with thicknesses
- Cross-section diagram
- Alternates, exports and project bookmarks
No card required. After the 14-day trial, plans start at $29/mo.
Our previews are real data — live counts, no placeholders. We publish our error log →