Appendix BI — LIGHT STRAW-CLAY CONSTRUCTION
BI104 Thermal Performance — 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) § BI104 · Effective January 1, 2026 · Official source: Building Standards Commission
BI104.1 Thermal characteristics.¶
Walls with light straw-clay infill of densities greater than or equal to 20 pounds per cubic foot (480.6 kg/m [3] ) shall be classified as mass walls in accordance with Section N1102.2.6 (R402.2.6) and shall meet the R-value require
ments for mass walls in Table N1102.1.3. Walls with light straw-clay infill of densities less than 20 pounds per cubic foot (480.6 kg/m [3] ) shall meet the R-value requirements for wood frame walls in Table N1102.1.3.
BI104.2 Thermal resistance.¶
Light straw-clay shall be deemed to have a thermal resistance as specified in Table BI103.2.3.
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