Chapter 9 — ALTERATIONS—LEVEL 3
Section 906 — STRUCTURAL
2025 California Existing Building Code (Title 24, Part 10) · 2025 edition · ingested 2026-07-07 · California
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[BS] 906.1 General. Where buildings are undergoing Level 3 alterations, the provisions of this section shall apply. [BS] 906.2 Existing structural elements resisting lateral loads. Where work involves a substantial structural alteration,the lateral load-resisting system of the altered building shall be shown to satisfy the requirements of Section 1609 of the California Building Code and Section 304.3.2 of this code. Where the building is assigned to Seismic Design Category D or F, supports and attachments for nonstructural components required to serve any portion of the building with a use…