Chapter 18A — SOILS AND FOUNDATIONS
Section 1805A — DAMPPROOFING AND WATERPROOFING
2025 California Building Code (Title 24, Part 2) · 2025 edition · ingested 2026-07-07 · California
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1805 A .1 General. Walls or portions thereof that retain earth and enclose interior spaces and floors below grade shall be waterproofed and dampproofed in accordance with this section, with the exception of those spaces containing groups other than residential and institutional where such omission is not detrimental to the building or occupancy. Ventilation for crawl spaces shall comply with Section 1202.4. 1805 A .1.1 Story above grade plane. Where a basement is considered a story above grade plane and the finished ground level adjacent to the basement wall is below the basement floor…