Home / Requirements / California noncombustible wall

2025 California WUI Code noncombustible exterior-wall path

The 2025 California Wildland-Urban Interface Code includes noncombustible materials as an exterior-wall and exterior-wall-covering path.

This record covers documented noncombustibility in the siding category. Full wall construction, covering extent, joints, flashing, local amendments, and approval remain checks.

code · California mapped fire hazard areas · Last verified 2026-08-27 · JSON (CC BY 4.0)

Published requirement text

“Noncombustible materials.”

2025 California Wildland-Urban Interface Code construction notes, Sections 504.5 and 504.5.2 — Town of Truckee public record

Where this instrument is documented

Instrument cwuic-2025.

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

Place	Force	Reach	Dated	Checks open	Source
California	active application documented	mapped area	effective 2026-01-01	3	Building in the Wildland

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

Attribute	Operator	Value
noncombustible	eq	true

Products with documented matching attributes

Open the Build rules that quote this requirement

Product	Category	Status	Documented match evidence
AL13® Plank System	siding	Listed	1 cited field Noncombustible: Yes
Clicklad Closed-Gap aluminum cladding system	siding	Listed	1 cited field Noncombustible: Yes
Hardie® Plank lap siding	siding	Listed	1 cited field Noncombustible: Yes
Hardie® Textured Panel, noncombustible fiber-cement panel siding, 5/16" thick	siding	Listed	1 cited field Noncombustible: Yes · Listing 8140-2026:0502, Description field
JAMES HARDIE BUILDING PRODUCTS, INC. (8140-2026:0001)	siding	Listed	1 cited field Noncombustible: Yes
JAMES HARDIE BUILDING PRODUCTS, INC. (8140-2026:0004)	siding	Listed	1 cited field Noncombustible: Yes
JAMES HARDIE BUILDING PRODUCTS, INC. (8140-2026:0500)	siding	Listed	1 cited field Noncombustible: Yes
Longboard® 6-inch exterior aluminum siding	siding	Listed	1 cited field Noncombustible: Yes
ROCKWOOL Comfortboard 80 exterior continuous insulation	siding	Listed	1 cited field Noncombustible: Yes
Thermafiber RainBarrier High Compressive 80 and 110 exterior insulation	siding	Listed	2 cited fields Noncombustible: Yes Noncombustible: Yes
WoodSyn OptimBoard™ wood-wool cement sheathing	siding	Listed	1 cited field Noncombustible: Yes

Sources

2025 California Wildland-Urban Interface Code construction notes, Sections 504.5 and 504.5.2 — Town of Truckee public record (official). Accessed 2026-08-27.

2025 California WUI Code noncombustible exterior-wall path. FireApproved. https://fireapproved.com/requirements/cwuic-2025-noncombustible-exterior-wall/. Last verified 2026-08-27.