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The ember-resistant zone and home hardening are one system. Here's the structure side, prioritized by what actually saves homes in wind-driven ember events.
Priority order
The Thomas Fire took more than 500 Ventura residences in one night; the Mountain Fire took at least 83 homes in Camarillo Heights in 2024. Hardening plus Zone 0 is what survivability looks like when the next wind event comes.
Questions
They're partners. Zone 0 removes fuel in the first 5 feet; home hardening upgrades the structure itself: vents, eaves, roofing, decks, and windows. IBHS research treats them as one system, because embers exploit whichever weakness exists.
Ember-resistant vents are consistently the best cost-to-protection ratio. Embers entering attic and crawlspace vents ignite homes from the inside, and vent retrofits are far cheaper than roofing or window replacement.
New construction in Very High zones already follows Chapter 7A building standards. For existing homes, most hardening beyond Zone 0 is best practice rather than mandate, which makes it the smart thing to do while retrofitting the ember-resistant zone anyway.
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