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Chapter 3 — BUILDING PLANNING

Section R337.4

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.

IGNITION-RESISTANT CONSTRUCTION

R337.4.1 General. The materials prescribed herein for ignition resistance shall conform to the requirements of this chapter.

R337.4.2 Ignition-resistant materials. Ignition-resistant materials shall comply with one of the following:

1. The requirements in Section R337.4.3 when tested in accordance with the test procedures set forth in ASTM E84 or UL 723,

2. The test procedures and requirements set forth in SFM Standard 12-7A-5 “Ignition-Resistant Mate- rial”, or

3. One of the alternative methods in Section R337.4.4.

R337.4.3 Conditions of acceptance for ignition-resistant material tested in accordance with ASTM E84 or UL 723 . A material shall comply with the conditions of accep- tance in 1 and 2 below when the test is continued for an additional 20-minute period, meaning for a total test period of an “extended” 30-minute test period.

1. The material shall exhibit a flame spread index not exceeding 25 and shall show no evidence of pro- gressive combustion following the extended 30-min- ute test period.

2. The material shall exhibit a flame front that does not progress more than 10 1 /2 feet (3200 mm) beyond the centerline of the burner at any time during the extended 30-minute test period.

R337.4.4 Alternative methods for determining ignition- resistant material. Any one of the following shall be accepted as meeting the definition of ignition-resistant material:

1. Noncombustible material. Material that complies with the definition for noncombustible materials in Section 202.

2. Fire-retardant-treated wood. Fire-retardant-treated wood identified for exterior use that complies with the requirements of Section 2303.2 of the California Building Code.

3. Fire-retardant-treated wood shingles and shakes. Fire-retardant-treated wood shingles and shakes, as defined in Section 1505.6 of the California Building Code and listed by State Fire Marshal for use as “Class B” roof covering, shall be accepted as an Ignition-resistant wall covering material when installed over solid sheathing.

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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
    Overview
    1. Section R300
    2. Section R301
    3. Section R302
    4. Section R303
    5. Section R304
    6. Section R305
    7. Section R306
    8. Section R307
    9. Section R308
    10. Section R309
    11. Section R310
    12. Section R311
    13. Section R312
    14. Section R313
    15. Section R314
    16. Section R315
    17. Section R316
    18. Section R317
    19. Section R318
    20. Section R319
    21. Section R320
    22. Section R321
    23. Section R322
    24. Section R323
    25. Section 324
    26. Section R325
    27. Section R334
    28. Section R335
    29. Section R326
    30. Section R327
    31. Section R336
    32. Section R337
    33. Section R337.1
    34. Section R337.2
    35. Section R337.3
    36. Section R337.4
    37. Section R337.5
    38. Section R337.6
    39. Section R337.7
    40. Section R337.8
    41. Section R337.9
    42. Section R337.10
    43. Section R340
    44. Section R338
  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
  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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