Chapter IX — BUILDING REGULATIONS›Article 1.5 — AMENDMENTS TO THE CALIFORNIA RESIDENTIAL CODE
Los Angeles Municipal Code Art. 1.5 , Division 8 [roof-Ceiling Construction]
Los Angeles Municipal Code · 2026-10 edition · updated 2026-10-19 · Los Angeles
Cite as: Los Angeles Municipal Code Article 1.5 · Text as of 2026-10-19
SEC. 91.5.800. BASIC PROVISIONS.¶
(Amended by Ord. No. 187,719, Eff. 1/23/23.)
Chapter 8 of the CRC is hereby adopted by reference with the following exceptions, modifications and additions.
91.5.802.8. Lateral Support. Roof framing members and ceiling joists having a depth-to-thickness ratio exceeding 2 to 1 based on nominal dimensions shall be provided with lateral support at points of bearing to prevent rotation. For roof rafters with ceiling joists attached per CRC Table R602.3(1), the depth-thickness ratio for the total assembly shall be determined using the combined thickness of the rafter plus the attached ceiling joist. (Readopted by Ord. No. 188,797, Eff. 12/31/25.)
91.5.803.2.4. Openings in Horizontal Diaphragms. Openings in horizontal diaphragms shall conform to LAMC Paragraph 91.5.503.2.4. (Readopted by Ord. No. 188,797, Eff. 12/31/25.)
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