{"id":"r327-vs-cwuic","license":"CC-BY-4.0","data":{"title":"Oregon R327 versus California CWUIC","description":"Oregon opts in locally to ORSC R327. California maps WUI and now uses CWUIC (formerly Chapter 7A). Roof class, windows, vents, and who must comply all differ.","series":"documents","appliesTo":[],"whereThisDiffers":[{"place":"Oregon R327 glazing, where adopted","scopeKind":"place","placeId":"us-or","scopeMode":"exact","claim":"R327.3.6 requires exterior windows, windows within exterior doors, and skylights to be tempered glass, multilayered glazed panels, glass block, or to have a fire-resistance rating of not less than 20 minutes. Those are or options. Dual-pane is multilayered as written.","asOf":"2026-08-23T00:00:00.000Z","source":{"title":"2023 ORSC Section R327 amendment","url":"https://www.oregon.gov/bcd/codes-stand/Documents/23orsc-r327-amend.pdf","publisher":"Oregon Building Codes Division","sourceType":"official","accessedOn":"2026-08-23T00:00:00.000Z"}},{"place":"California CWUIC mapped areas","scopeKind":"place","placeId":"us-ca","scopeMode":"exact","claim":"CWUIC 504.8 wants multilayered glazed panels with at least one pane of tempered glass, or glass block, a 20-minute fire-protection rating, or glazing meeting SFM Standard 12-7A-2. Dual-pane without a tempered pane is not that usual path.","asOf":"2026-08-23T00:00:00.000Z","source":{"title":"2025 California Wildland-Urban Interface Code","url":"https://codes.iccsafe.org/content/CAWUIC2025P1","publisher":"ICC / California","sourceType":"official","accessedOn":"2026-08-23T00:00:00.000Z"}},{"place":"Unincorporated Deschutes County and Sisters","scopeKind":"place","placeIds":["us-or-deschutes","us-or-sisters"],"scopeMode":"exact","claim":"The county names double-pane windows, cementitious siding, and Class B or better asphalt shingles as commonly used fire-hardening materials. OSFM handbook products count when they are shown on the drawings. Typical additions, remodels, and partial repairs are not in R327 scope here. Mandatory for new dwellings and new accessory structures from 1 April 2026.","asOf":"2026-08-23T00:00:00.000Z","source":{"title":"Fire Hardening Requirements (R327)","url":"https://www.deschutescounty.gov/1255/Fire-Hardening-Requirements-R327","publisher":"Deschutes County","sourceType":"official","accessedOn":"2026-08-23T00:00:00.000Z"}},{"place":"Oregon R327 new-construction scope","scopeKind":"place","placeId":"us-or","scopeMode":"exact","claim":"BCD’s local-adoption FAQ says R327 applies only to new construction of new buildings governed by the ORSC. Replacement of roofing or siding on an existing structure is not an R327 job. If the dwelling or qualifying accessory structure was originally built to R327, later alterations, additions, or repairs are also subject to R327.","asOf":"2026-08-23T00:00:00.000Z","source":{"title":"Local adoption of ORSC R327 (BCD)","url":"https://www.oregon.gov/bcd/codes-stand/Documents/23orsc-r327-local-adoption.pdf","publisher":"Oregon Building Codes Division","sourceType":"official","accessedOn":"2026-08-23T00:00:00.000Z"}},{"place":"Oregon R327 roof, where adopted","scopeKind":"place","placeId":"us-or","scopeMode":"exact","claim":"The roof floor is a Class B-rated assembly equivalent. Wood shingles and wood shakes are not permitted. IBHS Essential still asks for Class A. Spec the stricter roof if you need both.","asOf":"2026-08-23T00:00:00.000Z","source":{"title":"2023 ORSC Section R327 amendment","url":"https://www.oregon.gov/bcd/codes-stand/Documents/23orsc-r327-amend.pdf","publisher":"Oregon Building Codes Division","sourceType":"official","accessedOn":"2026-08-23T00:00:00.000Z"}},{"place":"City of Ashland R327.4 adoption","scopeKind":"place","placeId":"us-or-ashland","scopeMode":"exact","claim":"Ashland Ordinance 3198 adopts the current ORSC including R327.4 within the City and became effective 1 October 2021. The local R327.4.1 text uses City-identified wildfire-hazard-zone criteria, and the Building Official may waive R327.4 for a particular property only by written substantial-compliance determination. The City states the 2018 Wildfire Hazard Zone expansion covers all city parcels. Confirm the project path with the City.","asOf":"2026-08-27T00:00:00.000Z","source":{"title":"Ashland Ordinance 3198","url":"https://records.ashland.or.us/weblink/0/edoc/129893/Ord%203198.pdf","publisher":"City of Ashland","sourceType":"official","accessedOn":"2026-08-27T00:00:00.000Z","documentDate":"2021-06-18T00:00:00.000Z"}},{"place":"City of Grants Pass R327 adoption","scopeKind":"place","placeId":"us-or-grants-pass","scopeMode":"exact","claim":"Grants Pass Municipal Code 9.04.010 adopts the ORSC and Section R327 into the City Building Code, and 9.04.200 requires all new construction to conform to the City Building Code. The ordinance index dates the 9.04.010 amendment, Ordinance 21-5805, to 2 June 2021. The retrieved text does not establish its effective date or decide the local wildfire-zone and project trigger for a parcel. Confirm with Building Division.","asOf":"2026-08-27T00:00:00.000Z","source":{"title":"Grants Pass Municipal Code Title 9, Buildings and Construction","url":"https://www.grantspassoregon.gov/DocumentCenter/View/42","publisher":"City of Grants Pass","sourceType":"official","accessedOn":"2026-08-27T00:00:00.000Z"}},{"place":"City of Bend","scopeKind":"place","placeId":"us-or-bend","scopeMode":"exact","claim":"Current Bend Code 9.10.010 establishes all Bend city limits as the WUI Hazard Zone and applies ORSC R327 throughout that area. The ordinance index dates NS-2552 to 15 April 2026 and the current code records May 2026 codification. The opened sources do not establish the exact effective date. Oregon BCD’s published adopter list still omitted Bend as of 27 August 2026.","asOf":"2026-08-27T00:00:00.000Z","source":{"title":"Bend Code 9.10.010, Specialty Codes","url":"https://bend.municipal.codes/BC/9.10.010","publisher":"City of Bend","sourceType":"official","accessedOn":"2026-08-27T00:00:00.000Z"}},{"place":"Colorado Wildfire Resiliency Code 2025","scopeKind":"place","placeId":"us-co","scopeMode":"exact","claim":"Colorado’s published book is the 2025 CWRC, not R327 and not CWUIC. Low fire intensity takes Class 1 hardening. Moderate or high takes Class 2 (303.3). The title is written to be adopted by a named jurisdiction. Confirm the local ordinance.","asOf":"2026-08-24T00:00:00.000Z","source":{"title":"2025 Colorado Wildfire Resiliency Code","url":"https://dfpc.colorado.gov/colorado-wildfire-resiliency-code","publisher":"Colorado Division of Fire Prevention and Control","sourceType":"official","accessedOn":"2026-08-24T00:00:00.000Z"}}],"faq":[{"question":"Does Oregon require Class A roofs?","answer":"Where R327 is adopted, the floor is a Class B-rated roof assembly equivalent. Wood shakes and wood shingles are not permitted. IBHS Essential and some community specs still ask for Class A. Spec Class A if you need both. Do not tell the official that R327 requires Class A."},{"question":"Do dual-pane energy-code windows satisfy Oregon R327?","answer":"Where R327 is adopted, R327.3.6 lists tempered glass, multilayered glazed panels, glass block, or a 20-minute fire rating as separate options. Dual-pane units are multilayered glazed panels. That is a complete R327 option as written. Deschutes County names double-pane windows among commonly used fire-hardening materials. That is not California practice."},{"question":"Is R327 statewide?","answer":"No. Only a city or county that runs a building inspection program may adopt it, and only by ordinance. Oregon BCD publishes a list. As of verification that list is Ashland, Deschutes County, Grants Pass, and Sisters. Bend is not on that BCD page. City of Bend adopted R327 by Ordinance NS-2552. See the adoption dataset. Confirm with the local department."},{"question":"What did Ashland adopt and when did it take effect?","answer":"Ashland Ordinance 3198 adopts the current ORSC including R327.4 within the City, effective 1 October 2021. The City states the Wildfire Hazard Zone covers all city parcels. The codified section preserves a written substantial-compliance waiver by the Building Official, so the local record is not merely Oregon's adopter-list label."},{"question":"What has Grants Pass actually adopted?","answer":"Municipal Code 9.04.010 adopts the Oregon Residential Specialty Code and Section R327 into the City Building Code; 9.04.200 requires new construction to conform to that code. The ordinance index dates Ordinance 21-5805 to 2 June 2021. The retrieved sources do not establish an effective date or decide the local wildfire-zone and project trigger. Confirm those with Building Division."},{"question":"Does it apply to my addition?","answer":"Oregon BCD’s local-adoption FAQ says R327 applies to new construction of new ORSC buildings, not typical additions, alterations, or a roofing or siding swap on an older house. If the dwelling was originally built to R327, later work is also subject to it. Deschutes County says the same for typical additions. Manufactured homes follow HUD, not ORSC. Confirm locally."}],"lastVerified":"2026-08-27T00:00:00.000Z","relatedGuides":["r327-adu-and-shops","oregon-bcd-osfm-odf","how-to-read-a-fhsz-map","r104-11-alternate-methods","party-walls-and-r327","cwrc-vs-r327-vs-cwuic","colorado-cwrc-adoption"],"relatedCategories":["vents","roofing","windows","eaves","doors"],"relatedStandards":["cwuic","cbc-chapter-7a","iwuic","cal-fire-bml","ibhs-wildfire-prepared","sfm-12-7a-2"]},"localClaims":[{"id":"guide:r327-vs-cwuic:1","anchor":"local-us-or-r327-vs-cwuic-1","objectKind":"guide","objectId":"r327-vs-cwuic","objectTitle":"Oregon R327 versus California CWUIC","objectHref":"/guides/r327-vs-cwuic/","topic":"vents","place":"Oregon R327 glazing, where adopted","scopeKind":"place","placeId":"us-or","scopeMode":"exact","claim":"R327.3.6 requires exterior windows, windows within exterior doors, and skylights to be tempered glass, multilayered glazed panels, glass block, or to have a fire-resistance rating of not less than 20 minutes. Those are or options. Dual-pane is multilayered as written.","asOf":"2026-08-23T00:00:00.000Z","source":{"title":"2023 ORSC Section R327 amendment","url":"https://www.oregon.gov/bcd/codes-stand/Documents/23orsc-r327-amend.pdf","publisher":"Oregon Building Codes Division","sourceType":"official","accessedOn":"2026-08-23T00:00:00.000Z"},"url":"/guides/r327-vs-cwuic/#local-us-or-r327-vs-cwuic-1"},{"id":"guide:r327-vs-cwuic:2","anchor":"local-us-ca-r327-vs-cwuic-2","objectKind":"guide","objectId":"r327-vs-cwuic","objectTitle":"Oregon R327 versus California CWUIC","objectHref":"/guides/r327-vs-cwuic/","topic":"vents","place":"California CWUIC mapped areas","scopeKind":"place","placeId":"us-ca","scopeMode":"exact","claim":"CWUIC 504.8 wants multilayered glazed panels with at least one pane of tempered glass, or glass block, a 20-minute fire-protection rating, or glazing meeting SFM Standard 12-7A-2. Dual-pane without a tempered pane is not that usual path.","asOf":"2026-08-23T00:00:00.000Z","source":{"title":"2025 California Wildland-Urban Interface Code","url":"https://codes.iccsafe.org/content/CAWUIC2025P1","publisher":"ICC / California","sourceType":"official","accessedOn":"2026-08-23T00:00:00.000Z"},"url":"/guides/r327-vs-cwuic/#local-us-ca-r327-vs-cwuic-2"},{"id":"guide:r327-vs-cwuic:3","anchor":"local-us-or-deschutes-r327-vs-cwuic-3","objectKind":"guide","objectId":"r327-vs-cwuic","objectTitle":"Oregon R327 versus California CWUIC","objectHref":"/guides/r327-vs-cwuic/","topic":"vents","place":"Unincorporated Deschutes County and Sisters","scopeKind":"place","placeIds":["us-or-deschutes","us-or-sisters"],"scopeMode":"exact","claim":"The county names double-pane windows, cementitious siding, and Class B or better asphalt shingles as commonly used fire-hardening materials. OSFM handbook products count when they are shown on the drawings. Typical additions, remodels, and partial repairs are not in R327 scope here. Mandatory for new dwellings and new accessory structures from 1 April 2026.","asOf":"2026-08-23T00:00:00.000Z","source":{"title":"Fire Hardening Requirements (R327)","url":"https://www.deschutescounty.gov/1255/Fire-Hardening-Requirements-R327","publisher":"Deschutes County","sourceType":"official","accessedOn":"2026-08-23T00:00:00.000Z"},"url":"/guides/r327-vs-cwuic/#local-us-or-deschutes-r327-vs-cwuic-3"},{"id":"guide:r327-vs-cwuic:4","anchor":"local-us-or-r327-vs-cwuic-4","objectKind":"guide","objectId":"r327-vs-cwuic","objectTitle":"Oregon R327 versus California CWUIC","objectHref":"/guides/r327-vs-cwuic/","topic":"vents","place":"Oregon R327 new-construction scope","scopeKind":"place","placeId":"us-or","scopeMode":"exact","claim":"BCD’s local-adoption FAQ says R327 applies only to new construction of new buildings governed by the ORSC. Replacement of roofing or siding on an existing structure is not an R327 job. If the dwelling or qualifying accessory structure was originally built to R327, later alterations, additions, or repairs are also subject to R327.","asOf":"2026-08-23T00:00:00.000Z","source":{"title":"Local adoption of ORSC R327 (BCD)","url":"https://www.oregon.gov/bcd/codes-stand/Documents/23orsc-r327-local-adoption.pdf","publisher":"Oregon Building Codes Division","sourceType":"official","accessedOn":"2026-08-23T00:00:00.000Z"},"url":"/guides/r327-vs-cwuic/#local-us-or-r327-vs-cwuic-4"},{"id":"guide:r327-vs-cwuic:5","anchor":"local-us-or-r327-vs-cwuic-5","objectKind":"guide","objectId":"r327-vs-cwuic","objectTitle":"Oregon R327 versus California CWUIC","objectHref":"/guides/r327-vs-cwuic/","topic":"vents","place":"Oregon R327 roof, where adopted","scopeKind":"place","placeId":"us-or","scopeMode":"exact","claim":"The roof floor is a Class B-rated assembly equivalent. Wood shingles and wood shakes are not permitted. IBHS Essential still asks for Class A. Spec the stricter roof if you need both.","asOf":"2026-08-23T00:00:00.000Z","source":{"title":"2023 ORSC Section R327 amendment","url":"https://www.oregon.gov/bcd/codes-stand/Documents/23orsc-r327-amend.pdf","publisher":"Oregon Building Codes Division","sourceType":"official","accessedOn":"2026-08-23T00:00:00.000Z"},"url":"/guides/r327-vs-cwuic/#local-us-or-r327-vs-cwuic-5"},{"id":"guide:r327-vs-cwuic:6","anchor":"local-us-or-ashland-r327-vs-cwuic-6","objectKind":"guide","objectId":"r327-vs-cwuic","objectTitle":"Oregon R327 versus California CWUIC","objectHref":"/guides/r327-vs-cwuic/","topic":"vents","place":"City of Ashland R327.4 adoption","scopeKind":"place","placeId":"us-or-ashland","scopeMode":"exact","claim":"Ashland Ordinance 3198 adopts the current ORSC including R327.4 within the City and became effective 1 October 2021. The local R327.4.1 text uses City-identified wildfire-hazard-zone criteria, and the Building Official may waive R327.4 for a particular property only by written substantial-compliance determination. The City states the 2018 Wildfire Hazard Zone expansion covers all city parcels. Confirm the project path with the City.","asOf":"2026-08-27T00:00:00.000Z","source":{"title":"Ashland Ordinance 3198","url":"https://records.ashland.or.us/weblink/0/edoc/129893/Ord%203198.pdf","publisher":"City of Ashland","sourceType":"official","accessedOn":"2026-08-27T00:00:00.000Z","documentDate":"2021-06-18T00:00:00.000Z"},"url":"/guides/r327-vs-cwuic/#local-us-or-ashland-r327-vs-cwuic-6"},{"id":"guide:r327-vs-cwuic:7","anchor":"local-us-or-grants-pass-r327-vs-cwuic-7","objectKind":"guide","objectId":"r327-vs-cwuic","objectTitle":"Oregon R327 versus California CWUIC","objectHref":"/guides/r327-vs-cwuic/","topic":"vents","place":"City of Grants Pass R327 adoption","scopeKind":"place","placeId":"us-or-grants-pass","scopeMode":"exact","claim":"Grants Pass Municipal Code 9.04.010 adopts the ORSC and Section R327 into the City Building Code, and 9.04.200 requires all new construction to conform to the City Building Code. The ordinance index dates the 9.04.010 amendment, Ordinance 21-5805, to 2 June 2021. The retrieved text does not establish its effective date or decide the local wildfire-zone and project trigger for a parcel. Confirm with Building Division.","asOf":"2026-08-27T00:00:00.000Z","source":{"title":"Grants Pass Municipal Code Title 9, Buildings and Construction","url":"https://www.grantspassoregon.gov/DocumentCenter/View/42","publisher":"City of Grants Pass","sourceType":"official","accessedOn":"2026-08-27T00:00:00.000Z"},"url":"/guides/r327-vs-cwuic/#local-us-or-grants-pass-r327-vs-cwuic-7"},{"id":"guide:r327-vs-cwuic:8","anchor":"local-us-or-bend-r327-vs-cwuic-8","objectKind":"guide","objectId":"r327-vs-cwuic","objectTitle":"Oregon R327 versus California CWUIC","objectHref":"/guides/r327-vs-cwuic/","topic":"vents","place":"City of Bend","scopeKind":"place","placeId":"us-or-bend","scopeMode":"exact","claim":"Current Bend Code 9.10.010 establishes all Bend city limits as the WUI Hazard Zone and applies ORSC R327 throughout that area. The ordinance index dates NS-2552 to 15 April 2026 and the current code records May 2026 codification. The opened sources do not establish the exact effective date. Oregon BCD’s published adopter list still omitted Bend as of 27 August 2026.","asOf":"2026-08-27T00:00:00.000Z","source":{"title":"Bend Code 9.10.010, Specialty Codes","url":"https://bend.municipal.codes/BC/9.10.010","publisher":"City of Bend","sourceType":"official","accessedOn":"2026-08-27T00:00:00.000Z"},"url":"/guides/r327-vs-cwuic/#local-us-or-bend-r327-vs-cwuic-8"},{"id":"guide:r327-vs-cwuic:9","anchor":"local-us-co-r327-vs-cwuic-9","objectKind":"guide","objectId":"r327-vs-cwuic","objectTitle":"Oregon R327 versus California CWUIC","objectHref":"/guides/r327-vs-cwuic/","topic":"vents","place":"Colorado Wildfire Resiliency Code 2025","scopeKind":"place","placeId":"us-co","scopeMode":"exact","claim":"Colorado’s published book is the 2025 CWRC, not R327 and not CWUIC. Low fire intensity takes Class 1 hardening. Moderate or high takes Class 2 (303.3). The title is written to be adopted by a named jurisdiction. Confirm the local ordinance.","asOf":"2026-08-24T00:00:00.000Z","source":{"title":"2025 Colorado Wildfire Resiliency Code","url":"https://dfpc.colorado.gov/colorado-wildfire-resiliency-code","publisher":"Colorado Division of Fire Prevention and Control","sourceType":"official","accessedOn":"2026-08-24T00:00:00.000Z"},"url":"/guides/r327-vs-cwuic/#local-us-co-r327-vs-cwuic-9"}]}