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Appendix AQ — TINY HOUSES

Section AS107

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.

AS107.1 Fire-resistance rating.

Strawbale walls shall not be considered to exhibit a fire-resistance rating, except for walls constructed in accordance with Section AS107.1.1 or AS107.1.2. Alternately, fire-resistance ratings of strawbale walls shall be determined in accordance with Section R302.

AS107.1.1 One-hour-rated clay-plastered wall. Onehour fire-resistance-rated nonload-bearing clay plastered strawbale walls shall comply with all of the following:

  1. Bales shall be laid flat or on-edge in a running bond.

  2. Bales shall maintain thickness of not less than 18 inches (457 mm).

  3. Bales shall have a minimum dry density of 7.25 pounds per cubic foot (116 kg/m 3 ).

  4. Gaps shall be stuffed with straw-clay.

  5. Clay plaster on each side of the wall shall be not less than 1 inch (25 mm) thick and shall be composed of a mixture of 3 parts clay, 2 parts chopped straw and 6 parts sand, or an alternative approved clay plaster.

  6. Plaster application shall be in accordance with Section AS104.4.3.3 for the number and thickness of coats.

AS107.1.2 Two-hour-rated cement-plastered wall. Twohour fire-resistance-rated nonload-bearing cement-plastered strawbale walls shall comply with all of the following:

  1. Bales shall be laid flat or on-edge in a running bond.

  2. Bales shall maintain a thickness of not less than 14 inches (356 mm).

  3. Bales shall have a minimum dry density of 7.25 pounds per cubic foot (116 kg/m 3 ).

  4. Gaps shall be stuffed with straw-clay .

  5. A single section of 1 /2-inch (38 mm) by 17-gage galvanized woven wire mesh shall be attached to wood members with 1 1 /2-inch (38 mm) staples at 6 inches (152 mm) on center. 9 gage U-pins with not less than 8-inch (203 mm) legs shall be installed at 18 inches (457 mm) on center to fasten the mesh to the bales.

  6. Cement plaster on each side of the wall shall be not less than 1 inch (25 mm) thick.

  7. Plaster application shall be in accordance with Section AS104.4.9 for the number and thickness of coats.

AS107.2 Openings in rated walls.

Openings and penetrations in bale walls required to have a fire-resistance rating shall satisfy the same requirements for openings and penetrations as prescribed in this code.

AS107.3 Clearance to fireplaces and chimneys.

Strawbale surfaces adjacent to fireplaces or chimneys shall be finished with not less than 3 /8-inch-thick (10 mm) plaster of any type permitted by this appendix. Clearance from the face of such plaster to fireplaces and chimneys shall be maintained as required from fireplaces and chimneys to combustibles in

APPENDIX AS—STRAWBALE CONSTRUCTION

Chapter 10, or as required by manufacturer’s instructions, whichever is more restrictive.

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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
    Overview
    1. Section AQ101
    2. Section AQ102
    3. Section AQ103
    4. Section AQ104
    5. Section AQ105
    6. Section AQ106
    7. Section AR101
    8. Section AR102
    9. Section AR103
    10. Section AR104
    11. Section AR105
    12. Section AS101
    13. Section AS102
    14. Section AS103
    15. Section AS104
    16. Section AS105
    17. Section AS106
    18. Section AS107
    19. Section AS108
    20. Section AS109
  25. Appendix AT — SOLAR-READY PROVISIONS—DETACHED ONE- AND
  26. Appendix AX — SWIMMING POOL SAFETY ACT
  27. Appendix AY — AREAS PROTECTED BY THE FACILITIES
  28. Appendix AZ — EMERGENCY HOUSING

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