Section 8 — 407 — VERTICAL SHAFTS
2025 California Historical Building Code (Title 24, Part 8) · 2025 edition · ingested 2026-07-06 · California
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Vertical shafts need not be enclosed when such shafts are blocked at every floor level by the installation of not less than 2 full inches (51 mm) of solid wood or equivalent construction to prevent the initial passage of smoke and flame. Automatic sprinkler systems or other solutions may be considered on a case-by-case basis, in lieu of enclosure of vertical shafts and stairwells.