BASIC PROVISIONS.
Los Angeles Municipal Code § 91.5.800
in effectSEC. 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.)
Source: City of Los Angeles, Charter and Codes (American Legal Publishing, codelibrary.amlegal.com)URL: https://codelibrary.amlegal.com/codes/los_angeles/latest/lamc/0-0-0-220219Fetched: 10/24/2026