Home / Requirements / 2021 IWUIC Class 1–2 solid-core door

2021 IWUIC Class 1 and 2 solid-core exterior-door path

The unamended 2021 IWUIC includes a solid-core wood exterior-door path with a minimum thickness of 1.75 inches in Class 1 and Class 2 construction.

This record covers the door-leaf attributes only. Glazing, frame, jamb, gaps, hardware, installation, approval, 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

“solid core wood not less than 1-3/4 inches thick (44 mm)”

2021 International Wildland-Urban Interface Code, Sections 504.9 and 505.9 — 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	Unit
assemblyRole	eq	exterior-door
solidCore	eq	true
thicknessIn	gte	1.75	inch

Sources

2021 International Wildland-Urban Interface Code, Sections 504.9 and 505.9 — International Code Council (official). Accessed 2026-08-27.

2021 IWUIC Class 1 and 2 solid-core exterior-door path. FireApproved. https://fireapproved.com/requirements/iwuic-2021-class-1-2-solid-core-exterior-door/. Last verified 2026-08-27.