Chapter 44 — REFERENCED STANDARDS
Section BJ108 — THERMAL INSULATION
2025 California Residential Code (Title 24, Part 2.5) · 2025 edition · ingested 2026-07-07 · California
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BJ108.1 R-value. ¶
BJ108.1 R-value. The unit R-value of a strawbale wall with bales laid flat is R-1.55 for each inch of bale thickness. The unit R-value of a strawbale wall with bales on-edge is R-1.85 for each inch of bale thickness.
BJ108.2 Compliance with Section R302.10.1. ¶
BJ108.2 Compliance with Section R302.10.1. Straw bales meet the requirements for insulation materials in Section R302.10.1 for flame spread index and smoke-developed index as tested in accordance with ASTM E84.