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Appendix S — STRAWBALE CONSTRUCTION

Section AS108

California Residential Code (Title 24, Part 2.5) · 2019 edition · updated 2026-09-12 · California

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

AS108.1 R-value.

The unit R -value of a strawbale wall with bales laid flat is R-1.55 for each inch of bale thickness. The unit R-value of a strawbale wall with bales on-edge is R-1.85 for each inch of bale thickness.

AS108.2 Compliance with Section R302.10.1.

Straw bales meet the requirements for insulation materials in Section R302.10.1 for flame spread index and smoke-developed index as tested in accordance with ASTM E84.

SECTION AS109 REFERENCED STANDARDS ASTM C5—10 Standard Specification for AS104.4.6.1
ASTM C5—10
Standard Specification for
Quicklime for
Structural Purposes		 AS104.4.6.1
ASTM C109/C
Standard Test Method for
109M—2015el
Compressive Strength of
Hydraulic Cement Mortars		 AS106.6.1
ASTM C141/C
Standard Specification for
141M—14
Hydrated Hydraulic Lime
for Structural Purposes		 AS104.4.6.1
ASTM C206—14
Standard Specification for
Finishing Hydrated Lime		 AS104.4.6.1
ASTM C926—15B Standard Specification for
Application of Portland
Cement Based Plaster		 AS104.4.7
AS104.4.8
ASTM C1707—11 Standard Specification AS104.4.6.1
for Pozzolanic Hydraulic
Lime for Structural Purposes
ASTM E2392/
Standard Guide for Design
ASTM E2392M
of Earthen Wall
—10
Building Systems		 AS104.4.3.2
ASTM BS1
Part 1: Building Lime.
ASTM BS EN 459 Definitions, Specifications
—2015
and Conformity Criteria;
Part 2: Test Methods		 AS104.4.6.1

Copyright © 2019 ICC. ALL RIGHTS RESERVED. Accessed by Kevin Day (kevin.day@dgs.ca.gov), (California Building Standards Commission) Order Number #100735044 on Jul 24, 2019 03:54 PM (PDT) pursuant to License Agreement with ICC. No further reproduction or distribution authorized. Single user only, copying and networking prohibited. ANY UNAUTHORIZED REPRODUCTION OR DISTRIBUTION IS A VIOLATION OF THE FEDERAL COPYRIGHT ACT AND THE LICENSE AGREEMENT, AND SUBJECT TO CIVIL AND CRIMINAL PENALTIES THEREUNDER.

100735044

620 2019 CALIFORNIA RESIDENTIAL CODE Copyright © 2019 ICC. ALL RIGHTS RESERVED. Accessed by Kevin Day (kevin.day@dgs.ca.gov), (California Building Standards Commission) Order Number #100735044 on Jul 24, 2019 03:54 PM (PDT) pursuant to License Agreement with ICC. No further reproduction or distribution authorized. Single user only, copying and networking prohibited. ANY UNAUTHORIZED REPRODUCTION OR DISTRIBUTION IS A VIOLATION OF THE FEDERAL COPYRIGHT ACT AND THE LICENSE AGREEMENT, AND SUBJECT TO CIVIL AND CRIMINAL PENALTIES THEREUNDER.

100735044

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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. Chapter 1 — SCOPE AND APPLICATION
  3. Chapter 3 — BUILDING PLANNING
  4. Chapter 4 — FOUNDATIONS
  5. Chapter 5 — FLOORS
  6. Chapter 6 — WALL CONSTRUCTION
  7. Chapter 7 — WALL COVERING
  8. Chapter 8 — ROOF-CEILING CONSTRUCTION
  9. Chapter 9 — ROOF ASSEMBLIES
  10. Chapter 10 — CHIMNEYS AND FIREPLACES
  11. Chapter 44 — REFERENCED STANDARDS
  12. Appendix F — RADON CONTROL METHODS
  13. Appendix H — PATIO COVERS
  14. Appendix I — PRIVATE SEWAGE DISPOSAL
  15. Appendix J — EXISTING BUILDINGS AND STRUCTURES
  16. Appendix K — SOUND TRANSMISSION
  17. Appendix L — PERMIT FEES
  18. Appendix O — AUTOMATIC VEHICULAR GATES
  19. Appendix Q — TINY HOUSES
  20. Appendix R — LIGHT STRAW-CLAY CONSTRUCTION
  21. ▸Appendix S — STRAWBALE CONSTRUCTION
    Overview
    1. Section AS101
    2. Section AS102
    3. Section AS103
    4. Section AS104
    5. Section AS105
    6. Section AS106
    7. Section AS107
    8. Section AS108
  22. Appendix T — SOLAR-READY PROVISIONS—DETACHED ONE- AND
  23. Appendix V — SWIMMING POOL SAFETY ACT
  24. Appendix W — AREAS PROTECTED BY THE FACILITIES
  25. Appendix X — EMERGENCY HOUSING

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