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2021 IWUIC Class 1 noncombustible eave-protection path

The unamended 2021 IWUIC permits ignition-resistant material on the exposed underside of Class 1 eaves and soffits; its ignition-resistant-material definition includes noncombustible material.

This record covers only a documented noncombustible eave or soffit product. Fascia backing, enclosure, geometry, other material paths, official class, project scope, and local amendments remain checks.

code · Jurisdictions adopting unamended 2021 IWUIC Chapter 5 · Last verified 2026-08-27 · JSON (CC BY 4.0)

Published requirement text

“Eaves and soffits shall be protected on the exposed underside by ignition-resistant materials”

2021 International Wildland-Urban Interface Code, Sections 503.2 and 504.3 — International Code Council

Where this instrument is documented

Instrument iwuic-2021.

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

Place	Force	Reach	Dated	Checks open	Source
Pennsylvania	active application documented	statewide	effective 2026-01-01	4	34 Pa. Code § 403.21 Uniform Construction Code

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
Hardie® Soffit non-vented fiber-cement panels	eaves	Listed	1 cited field Noncombustible: Yes

Sources

2021 International Wildland-Urban Interface Code, Sections 503.2 and 504.3 — International Code Council (official). Accessed 2026-08-27.

2021 IWUIC Class 1 noncombustible eave-protection path. FireApproved. https://fireapproved.com/requirements/iwuic-2021-class-1-noncombustible-eave/. Last verified 2026-08-27.