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Appendix A4

Section A4.407

California Green Building Standards Code (Title 24, Part 11) · 2022 edition · updated 2026-09-12 · California

WATER RESISTANCE AND MOISTURE MANAGEMENT A4.407.1 Drainage around foundations. Install foundation and landscape drains which discharge to a dry well, sump, bioswale or other approved on-site location.

A4.407.2 Roof drainage. Install gutter and downspout systems to route water at least 5 feet away from the foundation or connect to landscape drains which discharge to a dry well, sump, bioswale, rainwater capture system or other approved on-site location.

A4.407.3 Flashing details. Provide flashing details on the building plans which comply with accepted industry standards or manufacturer’s instructions. Details are shown on house plans at all of the following locations:

  1. Around windows and doors.

  2. Roof valleys.

  3. Deck connections to the structure.

  4. Roof-to-wall intersections.

  5. Chimneys to roof intersections.

  6. Drip caps above windows and doors with architectural projections. Note: Reference details may be found in the Residential Sheet Metal Guidelines published by the Sheet Metal and Air Conditioning Contractors’ National Association Inc.

A4.407.4 Material protection. Protect building materials delivered to the construction site from rain and other sources of moisture.

A4.407.5 Ice and water barriers. In Climate Zone 16, an ice and water barrier is installed at valley, eaves and wall to roof intersections. The ice and water barrier shall extend at least 24 inches inside the exterior wall line or as specified by the manufacturer’s installation instructions.

A4.407.6 Door protection. Exterior doors to the dwelling are covered to prevent water intrusion by one or more of the following:

  1. An awning at least 4 feet in depth is installed.

  2. The door is protected by a roof overhang at least 4 feet in depth.

  3. The door is recessed at least 4 feet.

  4. Other methods which provide equivalent protection. A4.407.7 Roof overhangs. A permanent overhang or awning at least 2 feet in depth is provided at all exterior walls.

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.

APPENDIX A4—RESIDENTIAL VOLUNTARY MEASURES

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▸Contents — California Green Building Standards Code (Title 24, Part 11)
California Green Building Standards Code (Title 24, Part 11)
  1. Chapter 1 — ADMINISTRATION
  2. Chapter 2 — DEFINITIONS
  3. Chapter 3 — GREEN BUILDING
  4. Chapter 4 — RESIDENTIAL MANDATORY MEASURES
  5. Chapter 5 — NONRESIDENTIAL MANDATORY MEASURES
  6. Chapter 6 — REFERENCED ORGANIZATIONS AND STANDARDS
  7. Chapter 7 — INSTALLER AND SPECIAL INSPECTOR QUALIFICATIONS
  8. Chapter 8 — COMPLIANCE FORMS, WORKSHEETS AND REFERENCE MATERIAL
  9. ▸Appendix A4
    Overview
    1. Section A4.101
    2. Section A4.102
    3. Section A4.103
    4. Section A4.104
    5. Section A4.105
    6. Section A4.106
    7. Section A4.107
    8. Section A4.108
    9. Section A4.201
    10. Section A4.202
    11. Section A4.203
    12. Section A4.301
    13. Section A4.302
    14. Section A4.303
    15. Section A4.304
    16. Section A4.305
    17. Section A4.306
    18. Section A4.401
    19. Section A4.402
    20. Section A4.403
    21. Section A4.404
    22. Section A4.405
    23. Section A4.406
    24. Section A4.407
    25. Section A4.408
    26. Section A4.409
    27. Section A4.410
    28. Section A4.411
    29. Section A4.501
    30. Section A4.502
    31. Section A4.503
    32. Section A4.504
    33. Section A4.505
    34. Section A4.506
    35. Section A4.507
    36. Section A4.508
    37. Section A4.509
    38. Section A4.601
    39. Section A4.602
    40. Section A4.602
    41. Section A4.602
    42. Section A4.602
    43. Section A4.602
    44. Section A4.602
    45. Section A4.602
    46. Section A4.602
    47. Section A4.602
    48. Section A4.602
  10. Appendix A5

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