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Appendix AT — SOLAR-READY PROVISIONS—DETACHED ONE- AND

Section AU109

California Residential Code (Title 24, Part 2.5) · 2022 edition · updated 2026-09-12 · California

Italicized text is a California amendment to the model code, as printed in the official publication.

AU109.1 Thermal characteristics.

Cob walls shall be classified as mass walls in accordance with Section N1102.2.5 and shall meet the R -value requirements for mass walls in Table N1102.1.3.

AU109.2 Thermal resistance.

The unit R -value for cob walls with a density of 110 pounds per cubic foot (1762 kg/m 3 ) shall be R-0.22 per inch of cob thickness. Walls that vary in thickness along their height or length shall use the average thickness of the wall to determine its R -value. The thermal resistance values of air films and finish materials or additional insulation shall be added to the cob wall’s thermal resistance value to determine the R -value of the wall assembly.

AU109.3 Additional insulation.

Where insulating materials are added to the face of a cob wall, the combination of additional insulation and any associated connecting, weatherresisting or protective materials shall comply with Section AU104.1.2, Items 1–4.

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▸Contents — California Residential Code (Title 24, Part 2.5)
California Residential Code (Title 24, Part 2.5)
  1. Chapter 2 — DEFINITIONS AND ABBREVIATIONS
  2. Appendix AF — RADON CONTROL
  3. Appendix AI — PRIVATE SEWAGE
  4. Appendix AJ — EXISTING
  5. Appendix AK — SOUND
  6. Appendix AO — AUTOMATIC
  7. Appendix AR — LIGHT STRAW-CLAY
  8. Appendix AS — STRAWBALE
  9. Appendix AU — COB CONSTRUCTION
  10. Appendix AV — BOARD
  11. Appendix AW — 3D-PRINTED BUILDING
  12. Chapter 1 — SCOPE AND APPLICATION
  13. Chapter 3 — BUILDING PLANNING
  14. Chapter 4 — FOUNDATIONS
  15. Chapter 5 — FLOORS
  16. Chapter 6 — WALL CONSTRUCTION
  17. Chapter 7 — WALL COVERING
  18. Chapter 8 — ROOF-CEILING CONSTRUCTION
  19. Chapter 9 — ROOF ASSEMBLIES
  20. Chapter 10 — CHIMNEYS AND FIREPLACES
  21. Chapter 44 — REFERENCED STANDARDS
  22. Appendix AH — PATIO COVERS
  23. Appendix AL — PERMIT FEES
  24. Appendix AQ — TINY HOUSES
  25. ▸Appendix AT — SOLAR-READY PROVISIONS—DETACHED ONE- AND
    Overview
    1. Section AT101 — (RB101)
    2. Section AT102 — (RB102)
    3. Section AT103 — (RB103)
    4. Section AU101
    5. Section AU102
    6. Section AU103
    7. Section AU104
    8. Section AU105
    9. Section AU106
    10. Section AU107
    11. Section AU108
    12. Section AU109
    13. Section AU110
    14. Section AV101
    15. Section AW101
    16. Section AW102
    17. Section AW103
    18. Section AW104
    19. Section AW105
    20. Section AW106
  26. Appendix AX — SWIMMING POOL SAFETY ACT
  27. Appendix AY — AREAS PROTECTED BY THE FACILITIES
  28. Appendix AZ — EMERGENCY HOUSING

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