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Chapter 5 — NONRESIDENTIAL MANDATORY MEASURES

Section 5.407 — WATER RESISTANCE AND MOISTURE MANAGEMENT

2025 California Green Building Standards Code (Title 24, Part 11) · 2025 edition · updated 2026-07-25 · California

5.407.1 Weather protection. Provide a weather-resistant exterior wall and foundation envelope as required by California Building Code Section 1402.2 (Weather Protection), manufacturer’s installation instructions or local ordinance, whichever is more stringent.

5.407.2 Moisture control. Employ moisture control measures by the following methods.

5.407.2.1 Sprinklers. Design and maintain landscape irrigation systems to prevent spray on structures.

5.407.2.2 Entries and openings. Design exterior entries and/or openings subject to foot traffic or wind-driven rain to prevent water intrusion into buildings as follows:

5.407.2.2.1 Exterior door protection. Primary exterior entries shall be covered to prevent water intrusion by using nonabsorbent floor and wall finishes within at least 2 feet around and perpendicular to such openings plus at least one of the following:

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

  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.

5.407.2.2.2 Flashing. Install flashings integrated with a drainage plane.

on Jul 18, 2025 11:14 AM (CDT) THEREUNDER.

NONRESIDENTIAL MANDATORY MEASURES

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▸ Contents — 2025 California Green Building Standards Code (Title 24, Part 11)
2025 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 4 — RESIDENTIAL MANDATORY MEASURES
  6. Chapter 4 — RESIDENTIAL MANDATORY MEASURES
  7. Chapter 4 — RESIDENTIAL MANDATORY MEASURES
  8. Chapter 4 — RESIDENTIAL MANDATORY MEASURES
  9. Chapter 5 — NONRESIDENTIAL MANDATORY MEASURES
  10. Chapter 5 — NONRESIDENTIAL MANDATORY MEASURES
  11. Chapter 5 — NONRESIDENTIAL MANDATORY MEASURES
  12. ▸ Chapter 5 — NONRESIDENTIAL MANDATORY MEASURES
    Overview
    1. Section 5.401 — GENERAL
    2. Section 5.402 — DEFINITIONS
    3. Section 5.403 — FOUNDATION SYSTEMS
    4. Section 5.404 — EFFICIENT FRAMING TECHNIQUES
    5. Section 5.405 — MATERIAL SOURCES
    6. Section 5.406 — ENHANCED DURABILITY AND REDUCED MAINTENANCE
    7. Section 5.407 — WATER RESISTANCE AND MOISTURE MANAGEMENT
    8. Section 5.408 — CONSTRUCTION WASTE REDUCTION, DISPOSAL AND REC…
    9. Section 5.409 — LIFE CYCLE ASSESSMENT
    10. Section 5.410 — BUILDING MAINTENANCE AND OPERATION
  13. Chapter 5 — NONRESIDENTIAL MANDATORY MEASURES
  14. Chapter 6 — REFERENCED ORGANIZATIONS AND STANDARDS
  15. Chapter 7 — INSTALLER AND SPECIAL INSPECTOR QUALIFICATIONS
  16. Chapter 8 — COMPLIANCE FORMS, WORKSHEETS AND REFERENCE MATERIAL

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