Appendix BI — LIGHT STRAW-CLAY CONSTRUCTION
BI102 Definitions — 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) § BI102 · Effective January 1, 2026 · Official source: Building Standards Commission
BI102.1 General.¶
The following words and terms shall, for the purposes of this appendix, have the meanings shown herein. Refer to Chapter 2 for general definitions.
CLAY. Inorganic soil with particle sizes of less than 0.00008 inch (0.002 mm) having the characteristics of high to very high dry strength and medium to high plasticity.
CLAY SLIP. A suspension of clay or clay subsoil particles in water.
CLAY SUBSOIL. Subsoil sourced directly from the earth or refined, containing clay and not more than trace amounts organic matter.
INFILL. Light straw-clay that is placed between the structural and nonstructural members of a building.
LIGHT STRAW-CLAY. A mixture of straw and clay slip compacted and dried to form insulation and plaster substrate between or around structural and nonstructural members in a wall.
NONBEARING. Not bearing the weight of the building other than the weight of the light straw-clay itself and its finish.
STRAW. The dry stems of cereal grains after the seed heads have been removed. VOID. Any space in a light straw-clay wall wider than 1/4 inch (6 mm), greater than 2 inches (51 mm) in horizontal length and greater than 2 inches (51 mm) in depth.
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