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Chapter 3 — BUILDING PLANNING

Section R337.8

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.

EXTERIOR WINDOWS, SKYLIGHTS AND DOORS

R337.8.1 General. R337.8.2 Exterior glazing. The following exterior glazing materials and/or assemblies shall comply with this sec- tion:

1. Exterior windows. 2. Exterior glazed doors. 3. Glazed openings within exterior doors. 4. Glazed openings within exterior garage doors. 5. Exterior structural glass veneer. 6. Skylights. 7. Vents. R337.8.2.1 Exterior windows, skylights and exterior glazed door assembly requirements. Exterior windows,

or the underside of the exposed underfloor shall be pro- tected by one or more of the following:

1. Noncombustible material.

2. Ignition-resistant material. The ignition-resistant material shall be labeled for exterior use and shall meet the requirements of Section R337.4.2.

3. Fire-retardant-treated wood. The fire-retardant- treated wood shall be labeled for exterior use and shall meet the requirements of Section 2303.2 of the California Building Code.

4. Materials approved for not less than 1-hour fire- resistance-rated construction on the exterior side, as tested in accordance with ASTM E119 or UL 263.

5. One layer of 5 /8-inch (16 mm) Type X gypsum sheathing applied behind an exterior covering on the underside of the floor projection.

6. The exterior portion of a 1-hour fire-resistance- rated exterior assembly, as tested in accordance with ASTM E119 or UL 263, applied to the under- side of the floor, including assemblies using the gyp- sum panel and sheathing products listed in the Gypsum Association Fire Resistance Design Man- ual.

7. The underside of a floor assembly that meets the performance criteria in Section R337.7.11 when tested in accordance with the test procedures set forth in ASTM E2957.

8. The underside of a floor assembly that meets the performance criteria in accordance with the test procedures set forth in SFM Standard 12-7A-3.

Exception to Section R337.7.9: Structural columns and beams do not require protection when they are constructed with sawn lumber or glue laminated wood with the smallest minimum nominal dimension of 4 inches (102 mm). Sawn or glue-laminated planks shall be splined, tongue-and-grove, or set close together and well spiked.

R337.7.10 Underside of appendages. When required by the enforcing agency the underside of overhanging appendages shall be enclosed to grade in accordance with the requirements of this chapter or the underside of the exposed underfloor shall be protected by one or more of the following:

1. Noncombustible material.

2. Ignition-resistant material. The ignition-resistant material shall be labeled for exterior use and shall meet the requirements of Section R337.7.2.

3. Fire-retardant-treated wood. The fire-retardant- treated wood shall be labeled for exterior use and shall meet the requirements of Section 2303.2 of the California Building Code.

4. Materials approved for not less than 1-hour fire- resistance-rated construction on the exterior side, as tested in accordance with ASTM E119 or UL 263.

Copyright © 2022 by, or licensed to, International Code Council, Inc. (ALL RIGHTS RESERVED); licensed to California Building Standards Commission pursuant to License Agreement. No further reproductions is authorized. 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.

BUILDING PLANNING

skylights and exterior glazed door assemblies shall comply with one of the following requirements:

1. Be constructed of multipane glazing with a mini- mum of one tempered pane meeting the require- ments of Section R308 Safety Glazing, or 2. Be constructed of glass block units, or 3. Have a fire-resistance rating of not less than 20 minutes when tested according to NFPA 257, or 4. Be tested to meet the performance requirements of SFM Standard 12-7A-2. R337.8.2.2 Operable skylights. Operable skylights shall be protected by a noncombustible mesh screen where the dimensions of the openings in the screen shall not exceed 1 /8 inch (3.2 mm). R337.8.2.3 Structural glass veneer. The wall assembly behind structural glass veneer shall comply with Sec- tion R337.7.3 Exterior walls. R337.8.3 Exterior doors. Exterior doors shall comply with one of the following:

1. The exterior surface or cladding shall be of noncom- bustible material, or 2. The exterior surface or cladding shall be of ignition- resistant material, or 3. The exterior door shall be constructed of solid core wood that complies with the following requirements:

3.1. Stiles and rails shall not be less than 1 3 /8 inches thick

3.2. Panels shall not be less than 1 1 /4 inches thick, except for the exterior perimeter of the panel that shall be permitted to taper to a tongue not less than 3 /8 inch thick.

4. The exterior door assembly shall have a fire-resis- tance rating of not less than 20 minutes when tested according to NFPA 252. 5. The exterior surface or cladding shall be tested to meet the performance requirements of Section R337.7.3.1 when tested in accordance with ASTM E2707. 6. The exterior surface or cladding shall be tested to meet the performance requirements of SFM Stan- dard 12-7A-1. R337.8.3.1 Exterior door glazing. Glazing in exterior doors shall comply with Section R337.8.2.1. R337.8.4 Garage door perimeter gap. Exterior garage doors shall resist the intrusion of embers from entering by preventing gaps between doors and door openings, at the bottom, sides and tops of doors, from exceeding 1 /8 inch (3.2 mm). Gaps between doors and door openings shall be controlled by one of the following methods:

rs shall comply with Section R337.8.2.1._ R337.8.4 Garage door perimeter gap. Exterior garage doors shall resist the intrusion of embers from entering by preventing gaps between doors and door openings, at the bottom, sides and tops of doors, from exceeding 1 /8 inch (3.2 mm). Gaps between doors and door openings shall be controlled by one of the following methods:

1. Weather stripping products made of materials that: (a) have been tested for tensile strength in accor- dance with ASTM D638 (Standard Test Method for Tensile Properties of Plastics) after exposure to ASTM G155 (Standard Practice for Operating Xenon Arc Light Apparatus for Exposure of Non-

Metallic Materials) for a period of 2,000 hours, where the maximum allowable difference in tensile strength values between exposed and nonexposed samples does not exceed 10 percent and (b) exhibit a V-2 or better flammability rating when tested to UL 94, Standard for Tests for Flammability of Plas- tic Materials for Parts in Devices and Appliances. 2. Door overlaps onto jambs and headers. 3. Garage door jambs and headers covered with metal flashing.

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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
    Overview
    1. Section R300
    2. Section R301
    3. Section R302
    4. Section R303
    5. Section R304
    6. Section R305
    7. Section R307
    8. Section R308
    9. Section R306
    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 R324
    26. Section R325
    27. Section R327
    28. Section R326
    29. Section R328
    30. Section R329
    31. Section R330
    32. Section R334
    33. Section R335
    34. Section R336
    35. Section R337
    36. Section R337.1
    37. Section R337.2
    38. Section R337.3
    39. Section R337.4
    40. Section R337.5
    41. Section R337.6
    42. Section R337.7
    43. Section R337.8
    44. Section R337.9
    45. Section R337.10
    46. Section R338
    47. Section R340
  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
  26. Appendix AX — SWIMMING POOL SAFETY ACT
  27. Appendix AY — AREAS PROTECTED BY THE FACILITIES
  28. Appendix AZ — EMERGENCY HOUSING

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