Amend Section R337.7.10 of the 2022 California Residential Code to read as follows:
R337.7.10 Underside of appendages. The underside of overhanging appendages shall be enclosed to grade in accordance with the requirements of this chapter or the underside of the exposed underfloor shall consist of one of the following:
1. Noncombustible material.
2. Ignition-resistant material. The ignition-resistant material shall be labeled for exterior use and shall meet the requirements of Section R337.7.2.
3. Fire-retardant-treated wood. The fire-retardant-treated wood shall be labeled for exterior use and shall meet the requirements of Section 2303.2 of the California Building Code.
4. Material approved for not less than 1-hour fire -resistance-rated construction on the exterior side, as tested in accordance with ASTM E119 or UL 263.
5. One layer of 5/8-inch Type X gypsum sheathing applied behind an exterior covering on the underside of the appendage projection.
6. The exterior portion of a 1-hour fire resistive exterior wall assembly, as tested in accordance with ASTM E119 or UL 263, applied to the underside of the appendage including assemblies using the gypsum panel and sheathing products listed in the Gypsum Association Fire Resistance Design Manual.
7. The underside of an appendage assembly that meets the performance criteria in Section R337.7.11 when tested in accordance with the test procedures set forth in ASTM E2957.
8. The underside of an appendage assembly that meets the performance criteria in accordance with the test procedures set forth in SFM Standard 12-7A-3.
Exception to Section R337.7.10:
Structural columns and beams do not require protection when they are constructed with sawn lumber or glue-laminated wood with the smallest minimum nominal dimension of 4 inches (102 mm). Sawn or glue-laminated planks splined, tongue-and-grove, or set close together and well spiked.
Amend Section R337.10.3 of the 2022 California Residential Code to read as follows:
R337.10.3. Where required. Accessory structures shall comply with the requirements of this section.
Delete Section R337.10.3.1 in its entirety.
Delete Section R337.10.3.2 in its entirety.
Delete Section R337.10.3.3 in its entirety.
Delete Section R337.10.3.4 in its entirety.
(Ord. 22-2245, part, 2022; Ord. 19-2189, § 1 (part), 2019)