{"id":"iwuic-2021-class-1-2-noncombustible-exterior-wall","license":"CC-BY-4.0","data":{"title":"2021 IWUIC Class 1 and 2 noncombustible exterior-wall path","shortName":"2021 IWUIC Class 1–2 noncombustible wall","summary":"The unamended 2021 IWUIC includes approved noncombustible material as an exterior-wall path in Class 1 and Class 2 construction.","framing":"This record covers only the product material path. Approval, full wall construction, foundation-to-roof extent, other alternatives, official class, project scope, and local amendments remain checks.","kind":"code","instrumentId":"iwuic-2021","jurisdiction":"Jurisdictions adopting unamended 2021 IWUIC Chapter 5","appliesToCategories":["siding"],"quotedText":"Approved noncombustible materials.","source":{"title":"2021 International Wildland-Urban Interface Code, Sections 504.5 and 505.5","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":"noncombustible","op":"eq","value":true}],"relatedStandards":["iwuic","astm-e136"],"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, Chapter 5","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"}],"unresolvedPredicates":["official-hazard-map","official-hazard-class","project-type","official-confirmation"],"source":{"title":"34 Pa. 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":"anenda-systems-inc-al13-aluminum-plank-system","name":"AL13® Plank System","url":"/materials/anenda-systems-inc-al13-aluminum-plank-system/","categories":["siding"],"complianceStatus":"listed","documentedAttributes":[{"attribute":"noncombustible","value":true,"source":{"title":"AL13 Plank System product page and technical downloads","url":"https://al13.com/plank-system/","publisher":"AL13 Architectural Systems","accessedOn":"2026-08-25T00:00:00.000Z","sourceType":"manufacturer"},"documentLocation":null,"excerpt":null}]},{"id":"clicklad-aluminum-siding","name":"Clicklad Closed-Gap aluminum cladding system","url":"/materials/clicklad-aluminum-siding/","categories":["siding"],"complianceStatus":"listed","documentedAttributes":[{"attribute":"noncombustible","value":true,"source":{"title":"Closed-Gap Click Cladding System specification sheet","url":"https://clicklad.com/wp-content/uploads/2025/11/Closed-Gap-Click-Cladding-System-.pdf","publisher":"Clicklad Corporation","accessedOn":"2026-08-25T00:00:00.000Z","documentDate":"2025-11-01T00:00:00.000Z","sourceType":"manufacturer"},"documentLocation":null,"excerpt":null}]},{"id":"james-hardie-building-products-inc-8140-2026-0005","name":"Hardie® Plank lap siding","url":"/materials/james-hardie-building-products-inc-8140-2026-0005/","categories":["siding"],"complianceStatus":"listed","documentedAttributes":[{"attribute":"noncombustible","value":true,"source":{"title":"Hardie Plank lap siding product page","url":"https://www.jameshardie.com/product-catalog/undefined/hardie-plank-lap-siding/","publisher":"James Hardie Building Products","accessedOn":"2026-08-25T00:00:00.000Z","sourceType":"manufacturer"},"documentLocation":null,"excerpt":null}]},{"id":"james-hardie-building-products-inc-hardie-textured-panel-noncombustible","name":"Hardie® Textured Panel, noncombustible fiber-cement panel siding, 5/16\" thick","url":"/materials/james-hardie-building-products-inc-hardie-textured-panel-noncombustible/","categories":["siding"],"complianceStatus":"listed","documentedAttributes":[{"attribute":"noncombustible","value":true,"source":{"title":"CAL FIRE OSFM Building Materials Listing — 8140-2026:0502","url":"https://calfire.govmotus.org/BMLSearch/Index","publisher":"CAL FIRE OSFM","accessedOn":"2026-08-26T00:00:00.000Z","sourceType":"official-listing"},"documentLocation":"Listing 8140-2026:0502, Description field","excerpt":"*Hardie® Architectural Panel, noncombustible fiber-cement panel siding, 5/16\" thick."}]},{"id":"james-hardie-building-products-inc","name":"JAMES HARDIE BUILDING PRODUCTS, INC. (8140-2026:0001)","url":"/materials/james-hardie-building-products-inc/","categories":["siding"],"complianceStatus":"listed","documentedAttributes":[{"attribute":"noncombustible","value":true,"source":{"title":"Hardie Artisan Siding product page","url":"https://www.jameshardie.com/product-catalog/exterior-siding-products/hardie-artisan-siding/v-groove/primed-for-paint/","publisher":"James Hardie Building Products, Inc.","sourceType":"manufacturer","accessedOn":"2026-08-26T00:00:00.000Z"},"documentLocation":null,"excerpt":null}]},{"id":"james-hardie-building-products-inc-8140-2026-0004","name":"JAMES HARDIE BUILDING PRODUCTS, INC. (8140-2026:0004)","url":"/materials/james-hardie-building-products-inc-8140-2026-0004/","categories":["siding"],"complianceStatus":"listed","documentedAttributes":[{"attribute":"noncombustible","value":true,"source":{"title":"Hardie Shingle Siding product page","url":"https://www.jameshardie.com/product-catalog/exterior-siding-products/hardie-shingle-siding/straight-edge-panel/statement-collection-colors/","publisher":"James Hardie Building Products, Inc.","sourceType":"manufacturer","accessedOn":"2026-08-26T00:00:00.000Z"},"documentLocation":null,"excerpt":null}]},{"id":"james-hardie-building-products-inc-8140-2026-0500","name":"JAMES HARDIE BUILDING PRODUCTS, INC. (8140-2026:0500)","url":"/materials/james-hardie-building-products-inc-8140-2026-0500/","categories":["siding"],"complianceStatus":"listed","documentedAttributes":[{"attribute":"noncombustible","value":true,"source":{"title":"Hardie Artisan Siding product page","url":"https://www.jameshardie.com/product-catalog/exterior-siding-products/hardie-artisan-siding/v-groove/primed-for-paint/","publisher":"James Hardie Building Products, Inc.","sourceType":"manufacturer","accessedOn":"2026-08-26T00:00:00.000Z"},"documentLocation":null,"excerpt":null}]},{"id":"longboard-architectural-products-inc-model-longboard-exterior-aluminum","name":"Longboard® 6-inch exterior aluminum siding","url":"/materials/longboard-architectural-products-inc-model-longboard-exterior-aluminum/","categories":["siding"],"complianceStatus":"listed","documentedAttributes":[{"attribute":"noncombustible","value":true,"source":{"title":"Longboard 6-inch Lap Siding product page","url":"https://longboardproducts.com/exterior-products/siding/lap-siding","publisher":"Longboard Architectural Products Inc.","accessedOn":"2026-08-25T00:00:00.000Z","sourceType":"manufacturer"},"documentLocation":null,"excerpt":null}]},{"id":"rockwool-comfortboard-80-exterior-continuous-insulation","name":"ROCKWOOL Comfortboard 80 exterior continuous insulation","url":"/materials/rockwool-comfortboard-80-exterior-continuous-insulation/","categories":["siding"],"complianceStatus":"listed","documentedAttributes":[{"attribute":"noncombustible","value":true,"source":{"title":"Comfortboard 80 exterior continuous insulation technical data sheet","url":"https://www.rockwool.com/siteassets/o2-rockwool/documentation/technical-data-sheets/residential/comfortboard-80-non-structural-sheathing-continuous-insulation-techdata.pdf","publisher":"ROCKWOOL","accessedOn":"2026-08-25T00:00:00.000Z","sourceType":"manufacturer"},"documentLocation":null,"excerpt":null}]},{"id":"owens-corning-thermafiber-rainbarrier-high-compressive-80-110","name":"Thermafiber RainBarrier High Compressive 80 and 110 exterior insulation","url":"/materials/owens-corning-thermafiber-rainbarrier-high-compressive-80-110/","categories":["siding"],"complianceStatus":"listed","documentedAttributes":[{"attribute":"noncombustible","value":true,"source":{"title":"Thermafiber RainBarrier ci High Compressive (80)","url":"https://www.owenscorning.com/en-us/insulation/products/rain-barrier-ci-80","publisher":"Owens Corning","accessedOn":"2026-08-25T00:00:00.000Z","sourceType":"manufacturer"},"documentLocation":null,"excerpt":null},{"attribute":"noncombustible","value":true,"source":{"title":"Thermafiber RainBarrier ci High Compressive Plus (110)","url":"https://www.owenscorning.com/en-us/insulation/products/rainbarrier-ci-plus-110","publisher":"Owens Corning","accessedOn":"2026-08-25T00:00:00.000Z","sourceType":"manufacturer"},"documentLocation":null,"excerpt":null}]},{"id":"woodsyn-llc-optimboardtm","name":"WoodSyn OptimBoard™ wood-wool cement sheathing","url":"/materials/woodsyn-llc-optimboardtm/","categories":["siding"],"complianceStatus":"listed","documentedAttributes":[{"attribute":"noncombustible","value":true,"source":{"title":"WoodSyn OptimBoard product overview","url":"https://woodsyn.com/products","publisher":"WoodSyn, LLC","accessedOn":"2026-08-25T00:00:00.000Z","sourceType":"manufacturer"},"documentLocation":null,"excerpt":null}]}],"matchContract":"Products appear only when their cited fields satisfy this requirement's normalized constraints. Application scope and unresolved predicates remain separate; an attribute match is not a permit decision."}