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Division 96

Los Angeles Building Code — LAMC Chapter IX Art. 1.5 , Division 8

Los Angeles Building Code — LAMC Chapter IX · 2026-08 edition · updated 2026-09-23 · Los Angeles

Cite as: Los Angeles Building Code — LAMC Chapter IX Article 1.5 · Text as of 2026-09-23

[ROOF-CEILING CONSTRUCTION]

Section 91.5.800 Basic Provisions.

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. (Amended by Ord. No. 185,587, Eff. 7/16/18.)

91.5.802.10.2. Design. Wood trusses shall be designed in accordance with accepted engineering practice. The design and manufacture of metal-plate-connected wood trusses shall comply with ANSI/TPI 1. The truss design drawings shall be prepared by a registered professional.

91.5.803.2.4. Openings in Horizontal Diaphragms. Openings in horizontal diaphragms shall conform to LAMC Paragraph 91.5.503.2.4. (Amended by Ord. No. 185,587, Eff. 7/16/18.)

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▸Contents — Los Angeles Building Code — LAMC Chapter IX
Los Angeles Building Code — LAMC Chapter IX

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