{"id":"iwuic-2024-prescott-class-3-class-a-roof-assembly","license":"CC-BY-4.0","data":{"title":"Prescott 2024 IWUIC Class 3 Class A roof-assembly path","shortName":"Prescott Class 3 Class A roof","summary":"Prescott replaces the model Class 3 Class B minimum with a Class A tested roof assembly for moderate-risk sites assigned Class 3 construction.","framing":"A documented roof assembly can match the rating and test. Roof deck, underlayment, profile-space closure, City risk class, project trigger, and official approval remain separate checks.","kind":"code","instrumentId":"iwuic-2024","jurisdiction":"City of Prescott Class 3 ignition-resistant construction","placeIds":["us-az-prescott"],"appliesToCategories":["roofing"],"quotedText":"Roofs shall have a roof assembly that complies with a Class A rating when tested in accordance with ASTM E108 or UL 790.","source":{"title":"Prescott City Code 6-2, Section 506.2","url":"https://www.codepublishing.com/AZ/Prescott/html/Prescott06/Prescott062.html","publisher":"City of Prescott","sourceType":"official","accessedOn":"2026-08-26T00:00:00.000Z","documentDate":"2026-05-12T00:00:00.000Z"},"constraints":[{"attribute":"assemblyRole","op":"eq","value":"roof-assembly"},{"attribute":"fireRating","op":"eq","value":"class-a"},{"attribute":"testStandard","op":"in","value":["astm-e108","ul-790"]}],"relatedStandards":["iwuic","astm-e108-ul-790"],"author":"grayson-graham","reviewStatus":"draft","lastVerified":"2026-08-26T00:00:00.000Z"},"applications":[{"id":"iwuic-2024-prescott","title":"Prescott 2024 IWUIC application","instrumentId":"iwuic-2024","placeId":"us-az-prescott","status":"active","geographicScope":"incorporated-boundary","scopeSummary":"Prescott declares its entire incorporated city boundary a WUI, applies its amended 2024 IWUIC there, and uses City predictive modeling and GIS to assign extreme/IR1, high/IR2, or moderate/IR3 construction; boundary, project, risk-class, effective-date, and official checks remain open.","adoptedOn":"2026-05-12T00:00:00.000Z","requirementIds":["iwuic-2024-class-1-2-20-minute-exterior-door","iwuic-2024-class-1-2-class-a-roof-assembly","iwuic-2024-class-1-2-multilayered-glazing","iwuic-2024-class-1-2-noncombustible-deck","iwuic-2024-class-1-2-noncombustible-exterior-door","iwuic-2024-class-1-2-noncombustible-exterior-wall","iwuic-2024-class-1-2-solid-core-exterior-door","iwuic-2024-class-1-noncombustible-eave","iwuic-2024-class-1-wall-base-protection","iwuic-2024-class-2-solid-eave-enclosure","iwuic-2024-noncombustible-gutters","iwuic-2024-roof-profile-closure","iwuic-2024-roof-valley-flashing","iwuic-2024-vent-mesh","iwuic-2024-prescott-class-3-class-a-roof-assembly","iwuic-2024-prescott-class-3-one-hour-eave"],"requirementCoverage":"complete","requirementCoverageSummary":"All 15 normalized 2024 model material rows were reviewed against Prescott's enumerated amendments; the model Class 3 Class B roof row is replaced, and one source-explicit local eave path is added. This is not full-code normalization, does not normalize ignition-resistant or dimensional-lumber alternatives that lack exact product-field semantics, and does not establish which class applies to one project.","requirementScopes":[{"requirementId":"iwuic-2024-class-1-2-20-minute-exterior-door","scopeKeys":["ignition-resistant-class-1","ignition-resistant-class-2"],"scopeSummary":"This exterior-door path applies only after the City assigns IR1 or IR2 construction.","sourceSections":["504.9","505.9"]},{"requirementId":"iwuic-2024-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 the City assigns IR1 or IR2 construction.","sourceSections":["504.2","505.2"]},{"requirementId":"iwuic-2024-class-1-2-multilayered-glazing","scopeKeys":["ignition-resistant-class-1","ignition-resistant-class-2"],"scopeSummary":"This multilayered-glazing path applies only after the City assigns IR1 or IR2 construction.","sourceSections":["504.8","505.8"]},{"requirementId":"iwuic-2024-class-1-2-noncombustible-deck","scopeKeys":["ignition-resistant-class-1","ignition-resistant-class-2"],"scopeSummary":"This noncombustible appendage path applies only after the City assigns IR1 or IR2 construction.","sourceSections":["504.7","505.7"]},{"requirementId":"iwuic-2024-class-1-2-noncombustible-exterior-door","scopeKeys":["ignition-resistant-class-1","ignition-resistant-class-2"],"scopeSummary":"This noncombustible exterior-door path applies only after the City assigns IR1 or IR2 construction.","sourceSections":["504.9","505.9"]},{"requirementId":"iwuic-2024-class-1-2-noncombustible-exterior-wall","scopeKeys":["ignition-resistant-class-1","ignition-resistant-class-2"],"scopeSummary":"This noncombustible exterior-wall path applies only after the City assigns IR1 or IR2 construction.","sourceSections":["504.5","505.5"]},{"requirementId":"iwuic-2024-class-1-2-solid-core-exterior-door","scopeKeys":["ignition-resistant-class-1","ignition-resistant-class-2"],"scopeSummary":"This solid-core exterior-door path applies only after the City assigns IR1 or IR2 construction.","sourceSections":["504.9","505.9"]},{"requirementId":"iwuic-2024-class-1-noncombustible-eave","scopeKeys":["ignition-resistant-class-1"],"scopeSummary":"This noncombustible eave path applies only after the City assigns IR1 construction.","sourceSections":["503.2.1","504.3"]},{"requirementId":"iwuic-2024-class-1-wall-base-protection","scopeKeys":["ignition-resistant-class-1"],"scopeSummary":"This wall-base path applies only after the City assigns IR1 construction.","sourceSections":["504.5.1"]},{"requirementId":"iwuic-2024-class-2-solid-eave-enclosure","scopeKeys":["ignition-resistant-class-2"],"scopeSummary":"This solid eave-enclosure path applies only after the City assigns IR2 construction.","sourceSections":["505.3"]},{"requirementId":"iwuic-2024-noncombustible-gutters","scopeKeys":["ignition-resistant-class-1","ignition-resistant-class-2","ignition-resistant-class-3"],"scopeSummary":"This gutter-and-downspout path applies after the City assigns IR1, IR2, or IR3 construction.","sourceSections":["504.4","505.4","506.4"]},{"requirementId":"iwuic-2024-roof-profile-closure","scopeKeys":["ignition-resistant-class-1","ignition-resistant-class-2","ignition-resistant-class-3"],"scopeSummary":"This roof-profile closure applies after the City assigns IR1, IR2, or IR3 construction.","sourceSections":["504.2","505.2","506.2"]},{"requirementId":"iwuic-2024-roof-valley-flashing","scopeKeys":["ignition-resistant-class-1","ignition-resistant-class-2","ignition-resistant-class-3"],"scopeSummary":"This valley-flashing path applies after the City assigns IR1, IR2, or IR3 construction.","sourceSections":["504.2.1","505.2.1","506.2.1"]},{"requirementId":"iwuic-2024-vent-mesh","scopeKeys":["ignition-resistant-class-1","ignition-resistant-class-2","ignition-resistant-class-3"],"scopeSummary":"This prescriptive vent path applies after the City assigns IR1, IR2, or IR3 construction.","sourceSections":["504.10.2","505.10.2","506.5"]},{"requirementId":"iwuic-2024-prescott-class-3-class-a-roof-assembly","scopeKeys":["ignition-resistant-class-3"],"scopeSummary":"Prescott's local Class A replacement applies only after the City assigns IR3 construction.","sourceSections":["506.2"]},{"requirementId":"iwuic-2024-prescott-class-3-one-hour-eave","scopeKeys":["ignition-resistant-class-3"],"scopeSummary":"This local one-hour eave path applies only after the City assigns IR3 construction.","sourceSections":["506.6"]}],"requirementCrosswalk":[{"modelRequirementId":"iwuic-2024-class-1-2-20-minute-exterior-door","disposition":"adopted-unchanged","replacementRequirementIds":[],"scopeSummary":"Prescott's enumerated amendments do not modify the normalized Class 1 and 2 exterior-door atom.","sourceSections":["504.9","505.9"]},{"modelRequirementId":"iwuic-2024-class-1-2-class-a-roof-assembly","disposition":"adopted-unchanged","replacementRequirementIds":[],"scopeSummary":"Prescott rewrites Section 505.2 but retains the normalized Class A tested-assembly atom for Classes 1 and 2.","sourceSections":["504.2","505.2"]},{"modelRequirementId":"iwuic-2024-class-1-2-multilayered-glazing","disposition":"adopted-unchanged","replacementRequirementIds":[],"scopeSummary":"Prescott's enumerated amendments do not modify the normalized multilayered-glazing atom.","sourceSections":["504.8","505.8"]},{"modelRequirementId":"iwuic-2024-class-1-2-noncombustible-deck","disposition":"adopted-unchanged","replacementRequirementIds":[],"scopeSummary":"Prescott's enumerated amendments do not modify the normalized noncombustible-appendage atom.","sourceSections":["504.7","505.7"]},{"modelRequirementId":"iwuic-2024-class-1-2-noncombustible-exterior-door","disposition":"adopted-unchanged","replacementRequirementIds":[],"scopeSummary":"Prescott's enumerated amendments do not modify the normalized noncombustible-door atom.","sourceSections":["504.9","505.9"]},{"modelRequirementId":"iwuic-2024-class-1-2-noncombustible-exterior-wall","disposition":"adopted-unchanged","replacementRequirementIds":[],"scopeSummary":"Prescott's enumerated amendments do not modify the normalized noncombustible-wall atom.","sourceSections":["504.5","505.5"]},{"modelRequirementId":"iwuic-2024-class-1-2-solid-core-exterior-door","disposition":"adopted-unchanged","replacementRequirementIds":[],"scopeSummary":"Prescott's enumerated amendments do not modify the normalized solid-core-door atom.","sourceSections":["504.9","505.9"]},{"modelRequirementId":"iwuic-2024-class-1-noncombustible-eave","disposition":"adopted-unchanged","replacementRequirementIds":[],"scopeSummary":"Prescott's enumerated amendments do not modify the normalized Class 1 noncombustible-eave atom.","sourceSections":["503.2.1","504.3"]},{"modelRequirementId":"iwuic-2024-class-1-wall-base-protection","disposition":"adopted-unchanged","replacementRequirementIds":[],"scopeSummary":"Prescott's enumerated amendments do not modify the normalized wall-base atom.","sourceSections":["504.5.1"]},{"modelRequirementId":"iwuic-2024-class-2-solid-eave-enclosure","disposition":"adopted-unchanged","replacementRequirementIds":[],"scopeSummary":"Prescott's enumerated amendments do not modify the normalized Class 2 solid-eave atom.","sourceSections":["505.3"]},{"modelRequirementId":"iwuic-2024-class-3-class-b-roof-assembly","disposition":"locally-modified","replacementRequirementIds":["iwuic-2024-prescott-class-3-class-a-roof-assembly"],"scopeSummary":"Prescott rewrites Section 506.2 and replaces the model Class 3 Class B minimum with a Class A tested roof assembly.","sourceSections":["506.2"]},{"modelRequirementId":"iwuic-2024-noncombustible-gutters","disposition":"adopted-unchanged","replacementRequirementIds":[],"scopeSummary":"Prescott's enumerated amendments do not modify the normalized noncombustible gutter-and-downspout atom.","sourceSections":["504.4","505.4","506.4"]},{"modelRequirementId":"iwuic-2024-roof-profile-closure","disposition":"adopted-unchanged","replacementRequirementIds":[],"scopeSummary":"Prescott's rewritten Class 2 and 3 roof sections retain the normalized roof-profile closure atom.","sourceSections":["504.2","505.2","506.2"]},{"modelRequirementId":"iwuic-2024-roof-valley-flashing","disposition":"adopted-unchanged","replacementRequirementIds":[],"scopeSummary":"Prescott's enumerated amendments do not modify the normalized valley-flashing atom.","sourceSections":["504.2.1","505.2.1","506.2.1"]},{"modelRequirementId":"iwuic-2024-vent-mesh","disposition":"adopted-unchanged","replacementRequirementIds":[],"scopeSummary":"Prescott's rewritten Section 506.5 expressly points Class 3 vents to the Class 1 prescriptive or tested paths, retaining the normalized vent atom.","sourceSections":["504.10.2","505.10.2","506.5"]}],"map":{"status":"official-map-required-not-located","summary":"Section 302.1 declares the entire city WUI, but Sections 302.2 and 502 require the City's public GIS and predictive model to assign the parcel's risk severity; the exact current public risk-layer URL was not located.","source":{"title":"Prescott City Code 6-2, Sections 302.1, 302.2, and 502","url":"https://www.codepublishing.com/AZ/Prescott/html/Prescott06/Prescott062.html","publisher":"City of Prescott","sourceType":"official","accessedOn":"2026-08-26T00:00:00.000Z","documentDate":"2026-05-12T00:00:00.000Z"}},"projectTriggers":[{"summary":"The code applies to construction, alteration, movement, repair, maintenance, and use of buildings, structures, or premises within Prescott's declared citywide WUI, subject to stated exceptions.","sourceSections":["101.2","302.1"],"source":{"title":"Prescott City Code 6-2","url":"https://www.codepublishing.com/AZ/Prescott/html/Prescott06/Prescott062.html","publisher":"City of Prescott","sourceType":"official","accessedOn":"2026-08-26T00:00:00.000Z","documentDate":"2026-05-12T00:00:00.000Z"}},{"summary":"Additions or alterations that increase the existing footprint by 500 square feet or more must conform as new construction; separate Section 105.3 thresholds and Appendix B vegetation requirements remain part of the project review.","sourceSections":["101.5","105.3"],"source":{"title":"Prescott City Code 6-2","url":"https://www.codepublishing.com/AZ/Prescott/html/Prescott06/Prescott062.html","publisher":"City of Prescott","sourceType":"official","accessedOn":"2026-08-26T00:00:00.000Z","documentDate":"2026-05-12T00:00:00.000Z"}},{"summary":"Chapter 5 exemptions include specified interior work, additions no larger than 500 square feet, work affecting less than 25 percent of stated exterior areas, listed accessory structures, and maintenance work; the code official determines the project result.","sourceSections":["105.3"],"source":{"title":"Prescott City Code 6-2","url":"https://www.codepublishing.com/AZ/Prescott/html/Prescott06/Prescott062.html","publisher":"City of Prescott","sourceType":"official","accessedOn":"2026-08-26T00:00:00.000Z","documentDate":"2026-05-12T00:00:00.000Z"}}],"localAmendments":[{"kind":"modification","section":"6-2-1","summary":"Prescott adopts the 2024 International Wildland-Urban Interface Code by reference through Resolution 2026-1983 and records Ordinance 2026-1943 on May 12, 2026.","source":{"title":"Prescott City Code 6-2","url":"https://www.codepublishing.com/AZ/Prescott/html/Prescott06/Prescott062.html","publisher":"City of Prescott","sourceType":"official","accessedOn":"2026-08-26T00:00:00.000Z","documentDate":"2026-05-12T00:00:00.000Z"}},{"kind":"modification","section":"302.1–302.2, 502, and 503.1","summary":"Prescott declares the entire city WUI and maps extreme risk to IR1, high risk to IR2, and moderate risk to IR3 through City predictive modeling and GIS.","source":{"title":"Prescott City Code 6-2","url":"https://www.codepublishing.com/AZ/Prescott/html/Prescott06/Prescott062.html","publisher":"City of Prescott","sourceType":"official","accessedOn":"2026-08-26T00:00:00.000Z","documentDate":"2026-05-12T00:00:00.000Z"}},{"kind":"modification","section":"505.2 and 506.2","summary":"Prescott requires a Class A ASTM E108 or UL 790 roof assembly for both Class 2 and Class 3 construction and retains stated roof-profile closure alternatives.","source":{"title":"Prescott City Code 6-2","url":"https://www.codepublishing.com/AZ/Prescott/html/Prescott06/Prescott062.html","publisher":"City of Prescott","sourceType":"official","accessedOn":"2026-08-26T00:00:00.000Z","documentDate":"2026-05-12T00:00:00.000Z"}},{"kind":"addition","section":"506.6","summary":"Prescott adds Class 3 eave, soffit, and fascia-back protection paths using ignition-resistant, one-hour, dimensional-lumber, or exterior fire-retardant-treated material alternatives.","source":{"title":"Prescott City Code 6-2","url":"https://www.codepublishing.com/AZ/Prescott/html/Prescott06/Prescott062.html","publisher":"City of Prescott","sourceType":"official","accessedOn":"2026-08-26T00:00:00.000Z","documentDate":"2026-05-12T00:00:00.000Z"}}],"supportingSources":[{"title":"Prescott building permits and current code-adoption links","url":"https://prescott-az.gov/permit-center/permit-categories/building-permits/","publisher":"City of Prescott","sourceType":"official","accessedOn":"2026-08-26T00:00:00.000Z"}],"unresolvedPredicates":["official-boundary","official-hazard-map","official-hazard-class","project-type","effective-date","official-confirmation"],"source":{"title":"Prescott City Code 6-2 Urban-Wildland Interface Code","url":"https://www.codepublishing.com/AZ/Prescott/html/Prescott06/Prescott062.html","publisher":"City of Prescott","sourceType":"official","accessedOn":"2026-08-26T00:00:00.000Z","documentDate":"2026-05-12T00:00:00.000Z"},"author":"grayson-graham","reviewStatus":"draft","lastVerified":"2026-08-26T00:00:00.000Z"}],"products":[{"id":"polyglass-usa-inc-elastoflex-sa-p-fr-polyflex-sa-p-fr-elastobase-v","name":"Elastoflex SA P FR, Polyflex SA P FR, Elastobase V, Elastoflex SA V FR","url":"/materials/polyglass-usa-inc-elastoflex-sa-p-fr-polyflex-sa-p-fr-elastobase-v/","categories":["roofing"],"complianceStatus":"listed","documentedAttributes":[{"attribute":"assemblyRole","value":"roof-assembly","source":{"title":"CAL FIRE OSFM listing 8180-2305:0505","url":"https://calfire.govmotus.org/GOVFirePublicReport/ReportPublic?AppNum=CF24019388BML&type=BMLLINGLISTNEW","publisher":"CAL FIRE OSFM","accessedOn":"2026-08-26T00:00:00.000Z","sourceType":"official-listing"},"documentLocation":"Listing 8180-2305:0505, Design field","excerpt":"Elastoflex SA P FR, Polyflex SA P FR, Elastobase V, Elastoflex SA V FR, and Elastoflex SA V Plus FR are modified bitumen products that can be layered to form a Class A Roofing Systems."},{"attribute":"fireRating","value":"class-a","source":{"title":"CAL FIRE OSFM listing 8180-2305:0505","url":"https://calfire.govmotus.org/GOVFirePublicReport/ReportPublic?AppNum=CF24019388BML&type=BMLLINGLISTNEW","publisher":"CAL FIRE OSFM","accessedOn":"2026-08-26T00:00:00.000Z","sourceType":"official-listing"},"documentLocation":"Listing 8180-2305:0505, Design field","excerpt":"Approved Class A system."},{"attribute":"testStandard","value":"ul-790","source":{"title":"CAL FIRE OSFM listing 8180-2305:0505","url":"https://calfire.govmotus.org/GOVFirePublicReport/ReportPublic?AppNum=CF24019388BML&type=BMLLINGLISTNEW","publisher":"CAL FIRE OSFM","accessedOn":"2026-08-26T00:00:00.000Z","sourceType":"official-listing"},"documentLocation":"Listing 8180-2305:0505, Approval field","excerpt":"Complies with the applicable requirements in UL 790, 8th Edition."}]},{"id":"owens-corning-titanium-fr-aluminum-panel-assembly","name":"Owens Corning Titanium FR 0.032-inch aluminum-panel roof assembly","url":"/materials/owens-corning-titanium-fr-aluminum-panel-assembly/","categories":["roofing"],"complianceStatus":"attribute-match","documentedAttributes":[{"attribute":"assemblyRole","value":"roof-assembly","source":{"title":"Titanium FR installation instructions","url":"https://www.owenscorning.com/en-us/roofing/install-instructions/titanium-fr","publisher":"Owens Corning Roofing and Asphalt, LLC","accessedOn":"2026-08-24T00:00:00.000Z","sourceType":"manufacturer"},"documentLocation":null,"excerpt":null},{"attribute":"fireRating","value":"class-a","source":{"title":"Titanium FR installation instructions","url":"https://www.owenscorning.com/en-us/roofing/install-instructions/titanium-fr","publisher":"Owens Corning Roofing and Asphalt, 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Application scope and unresolved predicates remain separate; an attribute match is not a permit decision."}