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CAL FIRE home-hardening vent mesh

CAL FIRE guidance specifies a one-sixteenth- to one-eighth-inch band for noncombustible, corrosion-resistant metal mesh over vents.

This is public retrofit guidance. Ventilation capacity and project requirements still need review by the local building official.

guidance · California · Last verified 2026-08-24 · JSON (CC BY 4.0)

Published requirement text

“1/16-inch to 1/8-inch”

Hardening Your Home — CAL FIRE

Where this instrument is documented

Instrument cal-fire-home-hardening.

Set a location to read how this instrument lands where you are.

No sourced application record joins this requirement to a place. The quoted text stands on its own; local reach is unknown.

Each place page carries that place's boundary, project scope and open official checks in full; this page's JSON twin carries them per application.

Machine-readable constraints

AttributeOperatorValueUnit
assemblyRole in foundation-vent–retrofit-mesh–soffit-vent
meshSizeInch between 0.0625–0.125 inch
corrosionResistant eq true
noncombustible eq true

Products with documented matching attributes

Open the Build rules that quote this requirement

ProductCategoryStatusDocumented match evidence
FireStorm EmberMesh roll vents Attribute match
4 cited fields
Wildfire Defense Mesh 75 black roll vents Attribute match
4 cited fields

Sources

CAL FIRE home-hardening vent mesh. FireApproved. https://fireapproved.com/requirements/cal-fire-vent-mesh/. Last verified 2026-08-24.