Appendix BI Light Straw-Clay Construction — 2025 California Residential Code
California Residential Code (Title 24, Part 2.5) · 2025 edition · updated 2026-10-19 · California
CBSC: official editions, supplements and errata
Italicized text is a California amendment to the model code, as printed in the official publication.
Cite as: 2025 California Residential Code (Title 24, Part 2.5) Appendix BI · Effective January 1, 2026 · Official source: Building Standards Commission
The provisions contained in this appendix are not mandatory unless specifically adopted by a state agency or referenced in the adopting ordinance.
User notes:
About this appendix: While heavier forms of straw-clay construction have been used in various parts of the world for thousands of years, light forms of straw-clay construction began to appear in Europe in 1950 and in the United States in 1990. These lighter forms of straw-clay construction are intended as infill materials in nonload-bearing walls. The advantages of light straw-clay construction, such as regulated by Appendix BI, include thermal performance and low environmental impact.
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