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Subsection R503.2.4 is added to read as follows:

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 Section 2308.11.3.3 of the California Building Code. Openings shall be further limited in accordance with Section R301.2.2.2.5.

(Ord. 4994 § 9, 2019; Ord. 4878 § 9, 2016; Ord. 4755 § 9, 2013)