Section 8 — 403 — INTERIOR FINISH MATERIALS — 2025 California Historical Building Code (Title 24, Part 8)

New non-historical interior wall and ceiling finishes shall conform to the provisions of the regular code. Existing non-conforming materials used in interior walls and finishes may be surfaced with an approved fire-retardant to increase the rating of the natural finish to within reasonable proximity of the required rating. For wood lath and plaster walls, see Section 8-404. Exception: When an automatic sprinkler system is provided throughout the building, existing finishes shall be approved.

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