Section BK105 — COB WALLS—GENERAL — 2025 California Residential Code (Title 24, Part 2.5)

BK105.1 General. ¶

BK105.1 General. Cob walls shall be designed and constructed in accordance with this section and Figure BK101.4 or an approved alternative design. In addition to the general requirements for cob walls in this section, cob structural walls shall comply with Section BK106.

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BK105.2 Building limitations and requirements for cob wall construction. ¶

BK105.2 Building limitations and requirements for cob wall construction. Cob walls shall be subject to the following limitations and requirements: 1. Number of stories: not more than one. 2. Building height: not more than 20 feet (6096 mm). 3. Seismic design categories: limited to use in Seismic Design Categories A, B and C, except with an approved engineered design. 4. Wall height: in accordance with Table BK105.3, and with Table BK106.11(1) for braced wall panels. 5. Wall thickness, excluding finish, shall be not less than 10 inches (254 mm), not greater than 24 inches (610 mm) at the top…

provision permitted lot commission district approval parking minimum height dwelling application requirement review coverage subject setback occupancy development standard accessory yard section structure compliance use provision permitted lot commission district approval parking minimum height dwelling application requirement review coverage subject setback occupancy development standard accessory yard section structure compliance use provision permitted lot commission district approval parking minimum height dwelling application requirement review coverage subject setback occupancy development standard accessory yard section structure compliance use provision permitted lot commission district approval parking minimum height dwelling application requirement review coverage subject setback occupancy development standard accessory yard section structure compliance use provision permitted lot commission district approval parking minimum height dwelling application requirement review coverage subject setback occupancy development standard accessory yard section structure compliance use

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BK105.3 Out-of-plane resistance methods and unrestrained wall height limits. ¶

BK105.3 Out-of-plane resistance methods and unrestrained wall height limits. Cob walls shall employ a method of out-of-plane load resistance in accordance with Table BK105.3, and comply with its associated height limits and requirements. TABLE BK105.3—OUT-OF-PLANE RESISTANCE METHODS AND UNRESTRAINED WALL HEIGHT LIMITSCol2Col3Col4Col5Col6Col7 --------------------- WALL TYPEa, g, h<brAND METHOD OF<brOUT-OF-PLANE LOAD RESISTANCEFOR<brULTIMATE<brDESIGN<brWIND<brSPEEDS<br(mph)FOR<brSEISMIC<brDESIGN<brCATEGORIESUNRESTRAINED<brCOB WALL HEIGHTHb, c, hUNRESTRAINED<brCOB WALL HEIGHTHb, c, hTOP<brANC

provision permitted lot commission district approval parking minimum height dwelling application requirement review coverage subject setback occupancy development standard accessory yard section structure compliance use provision permitted lot commission district approval parking minimum height dwelling application requirement review coverage subject setback occupancy development standard accessory yard section structure compliance use provision permitted lot commission district approval parking minimum height dwelling application requirement review coverage subject setback occupancy development standard accessory yard section structure compliance use provision permitted lot commission district approval parking minimum height dwelling application requirement review coverage subject setback occupancy development standard accessory yard section structure compliance use provision permitted lot commission district approval parking minimum height dwelling application requirement review coverage subject setback occupancy development standard accessory yard section structure compliance use

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BK105.4 Moisture control. ¶

BK105.4 Moisture control. Cob walls shall be protected from moisture intrusion and damage in accordance with Sections BK105.3.4.1 through BK105.4.5. BK105.4.1 Water-resistive barriers and vapor permeance. Cob walls shall be constructed without a membrane barrier, except as otherwise required elsewhere in this appendix. Where a water-resistive barrier is placed behind an exterior finish, it shall be considered part of the finish system and shall comply with Item 2 of Section BK104.1.2 for the combined vapor permeance rating. BK105.4.2 Horizontal surfaces. Cob walls and other cob elements shall…

provision permitted lot commission district approval parking minimum height dwelling application requirement review coverage subject setback occupancy development standard accessory yard section structure compliance use provision permitted lot commission district approval parking minimum height dwelling application requirement review coverage subject setback occupancy development standard accessory yard section structure compliance use provision permitted lot commission district approval parking minimum height dwelling application requirement review coverage subject setback occupancy development standard accessory yard section structure compliance use provision permitted lot commission district approval parking minimum height dwelling application requirement review coverage subject setback occupancy development standard accessory yard section structure compliance use provision permitted lot commission district approval parking minimum height dwelling application requirement review coverage subject setback occupancy development standard accessory yard section structure compliance use

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BK105.5 Inspections. ¶

BK105.5 Inspections. In addition to ensuring compliance with Section R109.1, the building official shall inspect the following aspects of cob construction: 1. Anchors and vertical and horizontal reinforcing in cob walls, where required in accordance with Tables BK105.3 and BK106.11(1) and Sections BK105.3.4 through BK105.3.5. 2. Reinforcing in any concrete bond beams or lintels, in accordance with Section BK106.9.2 and Table BK106.10.

provision permitted lot commission district approval parking minimum height dwelling application requirement review coverage subject setback occupancy development standard accessory yard section structure compliance use provision permitted lot commission district approval parking minimum height dwelling application requirement review coverage subject setback occupancy development standard accessory yard section structure compliance use provision permitted lot commission district approval parking minimum height dwelling application requirement review coverage subject

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