Section BK101 — GENERAL — 2025 California Residential Code (Title 24, Part 2.5)

BK101.1 Scope. ¶

BK101.1 Scope. This appendix provides prescriptive and performance-based requirements for the use of natural cob as a building material. Buildings using cob walls shall comply with this code except as otherwise stated in this appendix.

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BK101.2 Intent. ¶

BK101.2 Intent. In addition to the intent described in Section R101.3, the purpose of this appendix is to establish minimum requirements for cob structures that provide flexibility in the application of certain provisions of the code, to permit the use of site-sourced and local materials, and to permit combinations of historical and modern techniques.

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

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BK101.3 Tests and empirical evidence. ¶

BK101.3 Tests and empirical evidence. Tests for an alternative material, design or method of construction shall be in accordance with Section R104.2.2.5, and the building official shall have the authority to consider evidence of a history of successful use in lieu of testing.

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

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BK101.4 Cob wall systems. ¶

BK101.4 Cob wall systems. Cob wall systems include those shown in Figure BK101.4 and approved variations. FIGURE BK101.4—TYPICAL COB WALL BOND BM PER SECTION BK106.9 ANCHORS, WHERE OCCUR, PER TABLES BK105.3, BK106.11(1) AND BK106.12 WALL TAPER ALLOWED ONE OR BOTH SIDES PER SECTION BK106.5(1) HORIZONTAL REINFORCING, WHERE OCCURS, PER TABLE BK106.11(1) VERTICAL REINFORCING, WHERE OCCURS, PER TABLE BK106.11(1) COB MATERIAL PER SECTION BK103 ANCHORS, WHERE OCCUR, PER TABLE BK106.11(1) SEPARATION FROM FINISHED GRADE PER SECTION BK105.4.4 FINISHED FLOOR LEVEL VARIES FINISHED GRADE FOUNDATION AND…

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

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