Vented fiber-cement soffit is not by itself an ember-rated eave vent

not-an-ember-rated-vent

Perforated or louvered fiber-cement soffit panels are a cladding product. They are not a substitute for 1/16–1/8 inch noncombustible mesh or an ASTM E2886 listed vent where eave ventilation is allowed. Deschutes County’s R327 page flags soffits under 12 feet as a protected assembly.

As of 2026-08-23. JSON (CC BY 4.0)

Sources

Fire Hardening Requirements (R327) — Deschutes County (official). Accessed 2026-08-23.
2023 ORSC Section R327 amendment — Oregon Building Codes Division (official). Accessed 2026-08-23.

Vented fiber-cement soffit is not by itself an ember-rated eave vent. FireApproved. https://fireapproved.com/findings/vented-fiber-cement-soffit-not-ember-vent/. As of 2026-08-23.