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Title 30 — RESIDENTIAL CODE

Los Angeles County Municipal Code Ch. 5 Floors

Los Angeles County Municipal Code · 2026-09 edition · updated 2026-10-04 · Los Angeles County

Cite as: Los Angeles County Municipal Code Chapter 5 · Text as of 2026-10-04

R501 - GENERAL R501.2 - Requirements.

Floor construction shall be capable of accommodating all loads in accordance with Section R301 and of transmitting the resulting loads to the supporting structural elements. Mechanical or plumbing fixtures and equipment shall be attached or anchored to the structure in accordance with Section R301.2.2.11.

(Ord. 2025-0051 § 23, 2025.)

R503 - FLOOR SHEATHING R503.2.4 - Openings in horizontal diaphragms.

Openings in horizontal diaphragms with a dimension perpendicular to the joist that is greater than 4 feet (1.2 m) shall be constructed in accordance with Figure R503.2.4.

(Ord. 2025-0051 § 24, 2025.)

FIGURE R503.2.4 OPENING IN HORIZONTAL DIAPHRAGMS

Notes:

a. Blockings shall be provided beyond headers.

b. Metal ties not less than 0.058 inch [1.47 mm (16 galvanized gage)] by 1.5 inches (38 mm) wide with eight 16d common nails on each side of the header-joist intersection. The metal ties shall have a minimum yield of 33,000 psi (227 MPa).

c. Openings in diaphragms shall be further limited in accordance with Section R301.2.2.6.

(Ord. 2025-0051 § 25, 2025.)

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Los Angeles County Municipal Code

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