{"id":"iwuic-2021-class-1-2-multilayered-glazing","license":"CC-BY-4.0","data":{"title":"2021 IWUIC Class 1 and 2 multilayered-glazing path","shortName":"2021 IWUIC Class 1–2 multilayered glazing","summary":"The unamended 2021 IWUIC includes multilayered glazed panels as one exterior-glazing path in Class 1 and Class 2 construction.","framing":"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.","kind":"code","instrumentId":"iwuic-2021","jurisdiction":"Jurisdictions adopting unamended 2021 IWUIC Chapter 5","appliesToCategories":["windows","doors"],"quotedText":"shall be tempered glass, multilayered glazed panels, glass block or have a fire protection rating","source":{"title":"2021 International Wildland-Urban Interface Code, Sections 504.8 and 505.8","url":"https://codes.iccsafe.org/content/IWUIC2021P2/chapter-5-special-building-construction-regulations","publisher":"International Code Council","sourceType":"official","accessedOn":"2026-08-27T00:00:00.000Z"},"constraints":[{"attribute":"assemblyRole","op":"in","value":["exterior-window","glazed-door","skylight"]},{"attribute":"paneCount","op":"gte","value":2}],"relatedStandards":["iwuic"],"author":"grayson-graham","reviewStatus":"draft","lastVerified":"2026-08-27T00:00:00.000Z"},"applications":[{"id":"iwuic-2021-pennsylvania","title":"Pennsylvania Uniform Construction Code incorporates IWUIC 2021","instrumentId":"iwuic-2021","placeId":"us-pa","status":"active","geographicScope":"statewide","scopeSummary":"34 Pa. Code § 403.21(a)(11) adopts and incorporates by reference the International Wildland-Urban Interface Code of 2021 as part of the Uniform Construction Code. The November 7, 2025 amendment is effective January 1, 2026, and the State's final report says the 2021 IWUIC was adopted without modification. Whether a given lot is in a wildland-urban interface, which ignition-resistant class applies, and whether a given project type is in scope still depend on the official map and the building official.","effectiveOn":"2026-01-01T00:00:00.000Z","requirementIds":["iwuic-2021-class-1-2-20-minute-exterior-door","iwuic-2021-class-1-2-class-a-roof-assembly","iwuic-2021-class-1-2-multilayered-glazing","iwuic-2021-class-1-2-noncombustible-deck","iwuic-2021-class-1-2-noncombustible-exterior-door","iwuic-2021-class-1-2-noncombustible-exterior-wall","iwuic-2021-class-1-2-quarter-inch-vent-mesh","iwuic-2021-class-1-2-solid-core-exterior-door","iwuic-2021-class-1-noncombustible-eave","iwuic-2021-class-2-solid-eave-enclosure","iwuic-2021-class-3-class-b-roof-assembly","iwuic-2021-noncombustible-gutters","iwuic-2021-roof-profile-closure","iwuic-2021-roof-valley-flashing"],"requirementCoverage":"partial","requirementCoverageSummary":"Fourteen source-exact 2021 IWUIC product-semantic atoms are normalized from the reviewed Class 1, Class 2, and Class 3 Chapter 5 provisions. This is not full-code normalization; ignition-resistant, fire-retardant-treated-wood, heavy-timber, rated-construction, cap-sheet, debris-control, and approval paths without complete product-field semantics remain outside the set. No 2018 or 2024 requirement is carried in by resemblance.","requirementScopes":[{"requirementId":"iwuic-2021-class-1-2-20-minute-exterior-door","scopeKeys":["ignition-resistant-class-1","ignition-resistant-class-2"],"scopeSummary":"This rated-door path applies only after official review assigns Class 1 or Class 2 construction.","sourceSections":["504.9","505.9"]},{"requirementId":"iwuic-2021-class-1-2-class-a-roof-assembly","scopeKeys":["ignition-resistant-class-1","ignition-resistant-class-2"],"scopeSummary":"This Class A roof path applies only after official review assigns Class 1 or Class 2 construction.","sourceSections":["504.2","505.2"]},{"requirementId":"iwuic-2021-class-1-2-multilayered-glazing","scopeKeys":["ignition-resistant-class-1","ignition-resistant-class-2"],"scopeSummary":"This glazing path applies only after official review assigns Class 1 or Class 2 construction.","sourceSections":["504.8","505.8"]},{"requirementId":"iwuic-2021-class-1-2-noncombustible-deck","scopeKeys":["ignition-resistant-class-1","ignition-resistant-class-2"],"scopeSummary":"This appendage path applies only after official review assigns Class 1 or Class 2 construction.","sourceSections":["504.7","505.7"]},{"requirementId":"iwuic-2021-class-1-2-noncombustible-exterior-door","scopeKeys":["ignition-resistant-class-1","ignition-resistant-class-2"],"scopeSummary":"This door-material path applies only after official review assigns Class 1 or Class 2 construction.","sourceSections":["504.9","505.9"]},{"requirementId":"iwuic-2021-class-1-2-noncombustible-exterior-wall","scopeKeys":["ignition-resistant-class-1","ignition-resistant-class-2"],"scopeSummary":"This wall-material path applies only after official review assigns Class 1 or Class 2 construction.","sourceSections":["504.5","505.5"]},{"requirementId":"iwuic-2021-class-1-2-quarter-inch-vent-mesh","scopeKeys":["ignition-resistant-class-1","ignition-resistant-class-2"],"scopeSummary":"This prescriptive vent path applies only after official review assigns Class 1 or Class 2 construction.","sourceSections":["504.10","505.10"]},{"requirementId":"iwuic-2021-class-1-2-solid-core-exterior-door","scopeKeys":["ignition-resistant-class-1","ignition-resistant-class-2"],"scopeSummary":"This door-leaf path applies only after official review assigns Class 1 or Class 2 construction.","sourceSections":["504.9","505.9"]},{"requirementId":"iwuic-2021-class-1-noncombustible-eave","scopeKeys":["ignition-resistant-class-1"],"scopeSummary":"This eave-material path applies only after official review assigns Class 1 construction.","sourceSections":["503.2","504.3"]},{"requirementId":"iwuic-2021-class-2-solid-eave-enclosure","scopeKeys":["ignition-resistant-class-2"],"scopeSummary":"This solid-enclosure path applies only after official review assigns Class 2 construction.","sourceSections":["505.3"]},{"requirementId":"iwuic-2021-class-3-class-b-roof-assembly","scopeKeys":["ignition-resistant-class-3"],"scopeSummary":"This Class B-or-better roof path applies only after official review assigns Class 3 construction.","sourceSections":["506.2"]},{"requirementId":"iwuic-2021-noncombustible-gutters","scopeKeys":["ignition-resistant-class-1","ignition-resistant-class-2","ignition-resistant-class-3"],"scopeSummary":"This gutter-material path applies after official review assigns Class 1, Class 2, or Class 3 construction.","sourceSections":["504.4","505.4","506.4"]},{"requirementId":"iwuic-2021-roof-profile-closure","scopeKeys":["ignition-resistant-class-1","ignition-resistant-class-2","ignition-resistant-class-3"],"scopeSummary":"This roof-profile path applies after official review assigns Class 1, Class 2, or Class 3 construction.","sourceSections":["504.2","505.2","506.2"]},{"requirementId":"iwuic-2021-roof-valley-flashing","scopeKeys":["ignition-resistant-class-1","ignition-resistant-class-2","ignition-resistant-class-3"],"scopeSummary":"This valley-flashing path applies after official review assigns Class 1, Class 2, or Class 3 construction.","sourceSections":["504.2.1","505.2.1","506.2.1"]}],"requirementCrosswalk":[{"modelRequirementId":"iwuic-2021-class-1-2-20-minute-exterior-door","disposition":"adopted-unchanged","replacementRequirementIds":[],"scopeSummary":"The State final report records the 2021 IWUIC as adopted without modification.","sourceSections":["504.9","505.9"]},{"modelRequirementId":"iwuic-2021-class-1-2-class-a-roof-assembly","disposition":"adopted-unchanged","replacementRequirementIds":[],"scopeSummary":"The State final report records the 2021 IWUIC as adopted without modification.","sourceSections":["504.2","505.2"]},{"modelRequirementId":"iwuic-2021-class-1-2-multilayered-glazing","disposition":"adopted-unchanged","replacementRequirementIds":[],"scopeSummary":"The State final report records the 2021 IWUIC as adopted without modification.","sourceSections":["504.8","505.8"]},{"modelRequirementId":"iwuic-2021-class-1-2-noncombustible-deck","disposition":"adopted-unchanged","replacementRequirementIds":[],"scopeSummary":"The State final report records the 2021 IWUIC as adopted without modification.","sourceSections":["504.7","505.7"]},{"modelRequirementId":"iwuic-2021-class-1-2-noncombustible-exterior-door","disposition":"adopted-unchanged","replacementRequirementIds":[],"scopeSummary":"The State final report records the 2021 IWUIC as adopted without modification.","sourceSections":["504.9","505.9"]},{"modelRequirementId":"iwuic-2021-class-1-2-noncombustible-exterior-wall","disposition":"adopted-unchanged","replacementRequirementIds":[],"scopeSummary":"The State final report records the 2021 IWUIC as adopted without modification.","sourceSections":["504.5","505.5"]},{"modelRequirementId":"iwuic-2021-class-1-2-quarter-inch-vent-mesh","disposition":"adopted-unchanged","replacementRequirementIds":[],"scopeSummary":"The State final report records the 2021 IWUIC as adopted without modification.","sourceSections":["504.10","505.10"]},{"modelRequirementId":"iwuic-2021-class-1-2-solid-core-exterior-door","disposition":"adopted-unchanged","replacementRequirementIds":[],"scopeSummary":"The State final report records the 2021 IWUIC as adopted without modification.","sourceSections":["504.9","505.9"]},{"modelRequirementId":"iwuic-2021-class-1-noncombustible-eave","disposition":"adopted-unchanged","replacementRequirementIds":[],"scopeSummary":"The State final report records the 2021 IWUIC as adopted without modification.","sourceSections":["503.2","504.3"]},{"modelRequirementId":"iwuic-2021-class-2-solid-eave-enclosure","disposition":"adopted-unchanged","replacementRequirementIds":[],"scopeSummary":"The State final report records the 2021 IWUIC as adopted without modification.","sourceSections":["505.3"]},{"modelRequirementId":"iwuic-2021-class-3-class-b-roof-assembly","disposition":"adopted-unchanged","replacementRequirementIds":[],"scopeSummary":"The State final report records the 2021 IWUIC as adopted without modification.","sourceSections":["506.2"]},{"modelRequirementId":"iwuic-2021-noncombustible-gutters","disposition":"adopted-unchanged","replacementRequirementIds":[],"scopeSummary":"The State final report records the 2021 IWUIC as adopted without modification.","sourceSections":["504.4","505.4","506.4"]},{"modelRequirementId":"iwuic-2021-roof-profile-closure","disposition":"adopted-unchanged","replacementRequirementIds":[],"scopeSummary":"The State final report records the 2021 IWUIC as adopted without modification.","sourceSections":["504.2","505.2","506.2"]},{"modelRequirementId":"iwuic-2021-roof-valley-flashing","disposition":"adopted-unchanged","replacementRequirementIds":[],"scopeSummary":"The State final report records the 2021 IWUIC as adopted without modification.","sourceSections":["504.2.1","505.2.1","506.2.1"]}],"supportingSources":[{"title":"2021 ICC Code Adoption Final Report","url":"https://www.pa.gov/content/dam/copapwp-pagov/en/dli/documents/ucc/documents/2021%20icc%20code%20adoption%20final%20report.pdf","publisher":"Pennsylvania Department of Labor & Industry","sourceType":"official","accessedOn":"2026-08-27T00:00:00.000Z"},{"title":"2021 International Wildland-Urban Interface Code, 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Code § 403.21 Uniform Construction Code","url":"https://www.pacodeandbulletin.gov/secure/pacode/data/034/chapter403/s403.21.html","publisher":"Pennsylvania Code and Bulletin","sourceType":"official","accessedOn":"2026-08-27T00:00:00.000Z"},"author":"grayson-graham","reviewStatus":"draft","lastVerified":"2026-08-27T00:00:00.000Z"}],"products":[{"id":"andersen-100-series-dual-pane-windows","name":"Andersen 100 Series windows with dual-pane glass","url":"/materials/andersen-100-series-dual-pane-windows/","categories":["windows"],"complianceStatus":"attribute-match","documentedAttributes":[{"attribute":"assemblyRole","value":"exterior-window","source":{"title":"100 Series center-of-glass performance for products with dual-pane glass","url":"https://www.andersenwindows.com/-/media/Project/AndersenCorporation/AndersenWindows/AndersenWindows/files/technical-docs/performance/performance-windows-patiodoors-centerofglassperformance--100series.pdf","publisher":"Andersen 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