BL101 General — 2025 California Residential Code

California Residential Code (Title 24, Part 2.5) · 2025 edition · updated 2026-10-19 · California

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Italicized text is a California amendment to the model code, as printed in the official publication.

Do hemp-lime walls need engineering in my seismic area?

Nonstructural wall infill only. Townhouses in Seismic Design Categories C, D0, D1, D2, and one- and two-family homes in D0, D1, D2 require an approved engineered design by a licensed design professional.

Cite as: 2025 California Residential Code (Title 24, Part 2.5) § BL101 · Effective January 1, 2026 · Official source: Building Standards Commission

BL101.1 Scope.¶

This appendix shall govern the use of hemp-lime as a nonstructural building material and wall infill system. Townhouses in Seismic Design Categories C, D0, D1 and D2 and one- and two-family dwellings in Seismic Design Categories D0, D1 and D2 shall require an approved engineered design by a registered design professional in accordance with Section R301.1.3.

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▸Contents — California Residential Code (Title 24, Part 2.5)

California Residential Code (Title 24, Part 2.5)

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