FA Exhibit MECH-010

National WUI intermix vs interface vs FHSZ vs 40 m (three nested scales)

Three equal NTS panels distinguish the Radeloff 2005 national intermix/interface method, California Fire Hazard Severity Zone classes, and Cohen’s home-plus-surrounding-40-meters ignition context. The objects can overlap geographically but do not nest by definition. — FA Exhibit MECH-010. National WUI, California FHSZ, and Cohen 40 meters. AFTER RADELOFF 2005 + CAL FIRE FHSZ FAQ 2024 + COHEN 2000 · ORIGINAL LINE ART. Illustrative — not a construction document. Verify with your building official. CC BY 4.0.

Technical review: Grayson Graham. Last verified 2026-08-25. JSON

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<img src="https://fireapproved.com/diagrams/mech-010-three-wildfire-map-objects.svg" alt="Three equal NTS panels distinguish the Radeloff 2005 national intermix/interface method, California Fire Hazard Severity Zone classes, and Cohen’s home-plus-surrounding-40-meters ignition context. The objects can overlap geographically but do not nest by definition." />

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