Section R403 of the California Residential Code is amended as follows:
R403.1 - R403.1.1 {CRC text not modified}
R403.1.2 Continuous footing in Seismic Design Categories D0, D1, and D2. Exterior walls of buildings located in Seismic Design Categories D0, D1 and D2 shall be supported by continuous solid or fully grouted masonry or concrete footings. All required interior braced wall panels in buildings located in Seismic Design Categories D0, D1 and D2 shall be supported on continuous foundations.
R403.1.3 Footing and stem wall reinforcing in Seismic Design Categories D0, D1, and D2. Concrete footings located in Seismic Design Categories D0, D1 and D2, as established in Table R301.2(1), shall have not fewer than three No. 4 horizontal bars. One
No. 4 horizontal bar shall be installed within 12 inches (305 mm) of the top of the stem wall and two No. 4 horizontal bars shall be located 3 to 4 inches (76 mm to 102 mm) from the bottom of the footing.
R403.1.3.1 Concrete stem walls with concrete footings. In Seismic Design Categories D0, D1 and D2 where a construction joint is created between a concrete footing and a stem wall, not fewer than one No. 4 vertical bar shall be installed at not more than 4 feet (1219 mm) on center. The vertical bar shall have a standard hook and extend to the bottom of the footing and shall have support and cover as specified in Section R403.1.3.5.3 and extend not less than 14 inches (357 mm) into the stem wall. Standard hooks shall comply with Section R608.5.4.5. Not fewer than one No. 4 horizontal bar shall be installed within 12 inches (305 mm) of the top of the stem wall and two No. 4 horizontal bars shall be located 3 to 4 inches (76 mm to 102 mm) from the bottom of the footing.
R403.1.3.2 Masonry stem walls with concrete footings. In Seismic Design Categories D0, D1 and D2 where a grouted masonry stem wall is supported on a concrete footing, not fewer than one No. 4 vertical bar shall be installed at not more than 4 feet (1219 mm) on center. The vertical bar shall have a standard hook and extend to the bottom of the footing and have support and cover as specified in Section R403.1.3.5.3 and extend not less than 14 inches (357 mm) into the stem wall. Standard hooks shall comply with Section R608.5.4.5. Not fewer than one No. 4 horizontal bar shall be installed within 12 inches (305 mm) of the top of the wall and two No. 4 horizontal bars shall be located 3 to 4 inches (76 mm to 102 mm) from the bottom of the footing. Masonry stem walls shall be solid grouted.
In Seismic Design Categories D0, D1 and D2 masonry stem walls without solid grout and vertical reinforcing are not permitted.
R403.1.3.3 - R403.1.7.4 {CRC text not modified}
R403.1.8 Foundations on expansive soils. Foundations and floor slabs for buildings located on expansive soils shall be designed in accordance with Section 1808.6 or Table 1809.7 of the California Building Code as amended in Municipal Code Section 16.04.300.
R403.1.8.1 {CRC text not modified}
(Ord. 5566 § 1 (part), 2022)