Home / Requirements / 2021 IWUIC Class 1–2 multilayered glazing

2021 IWUIC Class 1 and 2 multilayered-glazing path

The unamended 2021 IWUIC includes multilayered glazed panels as one exterior-glazing path in Class 1 and Class 2 construction.

This record covers only pane count and opening role. Tempered glass, glass block, 20-minute glazing, the complete opening schedule, official class, project scope, and local amendments remain separate paths.

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

Published requirement text

“shall be tempered glass, multilayered glazed panels, glass block or have a fire protection rating”

2021 International Wildland-Urban Interface Code, Sections 504.8 and 505.8 — 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
assemblyRole	in	exterior-window–glazed-door–skylight
paneCount	gte	2

Products with documented matching attributes

Open the Build rules that quote this requirement

Product	Category	Status	Documented match evidence
Andersen 100 Series windows with dual-pane glass	windows	Attribute match	3 cited fields Assembly role: exterior window Glazing panes: 2 Glazing panes: 2
Andersen 400 Series specialty windows with dual-pane glass	windows	Attribute match	3 cited fields Assembly role: exterior window Glazing panes: 2 Glazing panes: 2
Andersen A-Series windows with dual-pane glass	windows	Attribute match	3 cited fields Assembly role: exterior window Glazing panes: 2 Glazing panes: 2
Andersen E-Series specialty windows with dual-pane glass	windows	Attribute match	3 cited fields Assembly role: exterior window Glazing panes: 2 Glazing panes: 2
Infinity Awning — California Fire Glass option	windows	Attribute match	2 cited fields Assembly role: exterior window Glazing panes: 2
Infinity Bay — California Fire Glass option	windows	Attribute match	2 cited fields Assembly role: exterior window Glazing panes: 2
Infinity Casement — California Fire Glass option	windows	Attribute match	2 cited fields Assembly role: exterior window Glazing panes: 2
Infinity Double Hung — California Fire Glass option	windows	Attribute match	2 cited fields Assembly role: exterior window Glazing panes: 2
Infinity Round Top — California Fire Glass option	windows	Attribute match	2 cited fields Assembly role: exterior window Glazing panes: 2
Infinity Single Hung — California Fire Glass option	windows	Attribute match	2 cited fields Assembly role: exterior window Glazing panes: 2
Infinity Single Hung Round Top — California Fire Glass option	windows	Attribute match	2 cited fields Assembly role: exterior window Glazing panes: 2
Infinity Slider — California Fire Glass option	windows	Attribute match	2 cited fields Assembly role: exterior window Glazing panes: 2
Infinity Special Shape — California Fire Glass option	windows	Attribute match	2 cited fields Assembly role: exterior window Glazing panes: 2
Marvin Modern awning window with dual-pane glass	windows	Attribute match	3 cited fields Assembly role: exterior window Glazing panes: 2 Glazing panes: 2
Marvin Modern casement window with dual-pane glass	windows	Attribute match	3 cited fields Assembly role: exterior window Glazing panes: 2 Glazing panes: 2
Marvin Modern corner window with dual-pane glass	windows	Attribute match	3 cited fields Assembly role: exterior window Glazing panes: 2 Glazing panes: 2
Marvin Modern Direct Glaze window with dual-pane glass	windows	Attribute match	3 cited fields Assembly role: exterior window Glazing panes: 2 Glazing panes: 2
Marvin Vivid windows with standard dual-pane glass	windows	Attribute match	3 cited fields Assembly role: exterior window Glazing panes: 2 Glazing panes: 2
Pella 250 Series double-hung window with dual-pane glass	windows	Attribute match	3 cited fields Assembly role: exterior window Glazing panes: 2 Glazing panes: 2
Pella 250 Series picture window with dual-pane glass	windows	Attribute match	3 cited fields Assembly role: exterior window Glazing panes: 2 Glazing panes: 2
Pella Impervia casement window with dual-pane glass	windows	Attribute match	3 cited fields Assembly role: exterior window Glazing panes: 2 Glazing panes: 2
Pella Impervia double-hung window with dual-pane glass	windows	Attribute match	3 cited fields Assembly role: exterior window Glazing panes: 2 Glazing panes: 2
Pella Impervia fixed-frame window with dual-pane glass	windows	Attribute match	3 cited fields Assembly role: exterior window Glazing panes: 2 Glazing panes: 2
Pella Lifestyle Series double-hung window with dual-pane glass	windows	Attribute match	3 cited fields Assembly role: exterior window Glazing panes: 2 Glazing panes: 2
VELUX FCM fixed curb-mounted skylight — standard safety glass	windows	Attribute match	2 cited fields Assembly role: skylight · Page 1, product title and description Glazing panes: 2 · Page 1, Standard Safety Glass

Sources

2021 International Wildland-Urban Interface Code, Sections 504.8 and 505.8 — International Code Council (official). Accessed 2026-08-27.

2021 IWUIC Class 1 and 2 multilayered-glazing path. FireApproved. https://fireapproved.com/requirements/iwuic-2021-class-1-2-multilayered-glazing/. Last verified 2026-08-27.