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CBC Chapter 7A: Wildfire Resistance

Materials and construction methods for buildings in Wildland-Urban Interface zones

Last updated: September 21, 2025


Overview

California Building Code Chapter 7A establishes minimum standards for materials and construction methods for new buildings in Wildland-Urban Interface (WUI) Fire Areas. These requirements help structures resist ignition from wildfire exposures.

Mandatory Compliance: CBC Chapter 7A requirements are mandatory in designated Very High Fire Hazard Severity Zones (VHFHSZ) as determined by local fire authorities and CAL FIRE mapping.

The code addresses exterior components most vulnerable to wildfire including roofing, siding, windows, decks, soffits, and vents. These provisions work in conjunction with defensible space requirements to create ignition-resistant structures.

Component Guides

Soffits & Vents

Noncombustible materials and ember-resistant vent requirements for wildfire compliance including screening specifications and installation guidelines.

Key Requirements

  • Ignition-resistant or noncombustible materials for exterior components
  • Ember-resistant vents with 1/16" to 1/8" mesh screening
  • Class A fire-rated roofing assemblies
  • Tempered glass windows and doors
  • 6-foot clearance zones around structures

Resources

  • CAL FIRE - California Wildfire Mitigation Program
  • ICC Evaluation Service

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