{"id":"foundation-vents-mesh-not-ember-test","license":"CC-BY-4.0","data":{"title":"Foundation and underfloor vents may use mesh size. They are not required to be an ember-intrusion test.","kind":"not-an-ember-rated-vent","summary":"R327.3.2 allows underfloor ventilation openings to be covered with noncombustible corrosion-resistant metal wire mesh between 1/16 inch and 1/8 inch, or with vents designed to resist burning embers and flame, or other approved materials. Mesh is a sized screen, not ASTM E2886. Presenters at the 25 June 2026 Central Oregon seminar stated foundation vents need screen size, not an ember-intrusion test. Eave underside openings are a different sentence.","asOf":"2026-06-25T00:00:00.000Z","scopeKind":"place","placeIds":["us-or-bend","us-or-deschutes"],"scopeMode":"exact","jurisdictions":["us-or-bend","us-or-deschutes"],"relatedCategories":["vents"],"relatedStandards":["astm-e2886"],"sources":[{"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","notes":"R327.3.2 mesh minimum 1/16 inch and maximum 1/8 inch, or ember- and flame-resistant vents."},{"title":"Central Oregon Fire Hardening Codes Seminar","url":"https://www.deschutescounty.gov/1255/Fire-Hardening-Requirements-R327","publisher":"City of Bend Building Safety and Deschutes County Community Development","sourceType":"ahj-interpretation","accessedOn":"2026-08-23T00:00:00.000Z","documentDate":"2026-06-25T00:00:00.000Z","notes":"Public seminar at Riverhouse Convention Center, Bend, 25 June 2026. FireApproved cites the event and does not host the slide deck."}],"author":"grayson-graham","reviewStatus":"draft","lastVerified":"2026-08-23T00:00:00.000Z"}}