Chapter 17

Chapter 17. Residential Code

Sec. 9-17.01 Administration.

These regulations shall be known as the “Residential Building Code,” and may be so cited, and will be referred to herein as “this Chapter.” This Code is one (1) of the technical codes of building regulations and is administered under Chapter 9-1. (Ord. 477 § 17 (part), 2014: Ord. 462 § 16 (part), 2010. Formerly 9-16.01)

Sec. 9-17.02 Adoption by Reference.

The California Residential Code, 2022 Edition, including appendices, as published by the International Code Council, as modified by the State of California and published in the California Code of Regulations, Title 24, Part 2.5, is adopted by reference and made a part of this Chapter as though fully set forth herein, subject to the changes, additions and deletions as set forth in this Chapter. (Ord. 545 § 17, 2023)

Sec. 9-17.03 Copies on File.

One (1) copy of the 2022 Edition of the California Residential Code, as adopted by Section 9-17.02, is on file in the office of the Chief Building Official for inspection by the public. (Ord. 545 § 17, 2023)

Sec. 9-17.04 Amendments, Additions, and Deletions.

The following portion of the Ordinance Code of Contra Costa County, California, is adopted by reference under the authority of Sections 50020 through 50022.9 of the California Government Code:

Adopting the amendments to the 2022 California Residential Code by the changes, additions, and deletions set forth below as set forth in Contra Costa County Ordinance No. 2022-35, Chapter 74-4 and Division 72, Amendments to CRC, to read as follows, with the section numbers used below those of the 2022 California Residential Code:

(a) Sections R103 and R112 of CRC Chapter 1 (Scope and Application) are deleted.

(b) In Section R105.2 (Work exempt from permit) of CRC Chapter 1 (Scope and Application), subsection 3 is amended to read:

3. Retaining walls that are not more than 3 feet in height measured from the top of the footing to the top of the wall and that have a downward ground slope at the bottom of the retaining wall not exceeding 1(vertical):10(horizontal), unless supporting a surcharge or ground slope exceeding 1(vertical):2(horizontal) or impounding Class I, II, or III-a liquids.

(c) Section R314.8.1.1 is added to Section R314.8 (Existing Group R-3 occupancies) of CRC Chapter 3 (Building Planning), to read:

R314.8.1.1 Existing flat roof buildings. In existing flat roof buildings, the installation of a smoke detector that complies with Section R314.6 shall be required when a pitched roof is added on top of the existing flat roof and the solid sheathing of the flat roof is not removed.

(d) Section R602.10.3(3) (Bracing Requirements Based on Seismic Design Category) of CRC Chapter 6 (Wall Construction) is amended as follows:

(1) The title of Table R602.10.3(3) is amended to read:

TABLE R602.10.3(3)i

(2) Footnote “i” is added to Table R602.10.3(3) to read:

i. In Seismic Design Categories D0, D1, and D2, Method GB is not permitted and the use of Method PCP is limited to one-story dwellings and accessory structures.

(e) Section R602.10.4.5 is added to Section R602.10.4 (Construction methods for braced wall panels) of CRC Chapter 6 (Wall Construction) to read:

R602.10.4.5 Limits on methods GB and PCP. In Seismic Design Categories D0, D1, and D2, Method GB is not permitted, but gypsum board is permitted to be installed on the opposite side of the studs from other types of braced wall panel sheathing. In Seismic Design Categories D0, D1, and D2, the use of Method PCP is limited to one-story dwellings and accessory structures.

(1) Appendices AH and AX of the CRC are incorporated into the County building code. Appendices AA, AB, AC, AD, AE, AF, AG, AI, AJ, AK, AL, AM, AN, AO, AP, AQ, AR, AS, AT, AU, AV, AW, AY, and AZ of the CRC are excluded from the County building code.

(1) Footnote “g” is added to Table R602.10.3(3), to read:

g. In Seismic Design Categories D0, D1, and D2, Method GB is not permitted and the use of Method PCP is limited to one-story dwellings and accessory structures.

(a) Section R602.10.4.5 is added to Section R602.10.4 (Construction methods for braced wall panels) of CRC Chapter 6 (Wall Construction), to read:

(b) Appendix H of the CRC is incorporated into the City building code. Appendices A, B, C, D, E, F, G, I, J, K, L, M, N, O, P, Q, R, S, T, U, V, and W of the CRC are excluded from the City building code. (Ord. 545 § 17, 2023)