Berkeley Wildfire Ordinance Explained: The Science Behind Home Hardening

Public debate over Berkeley’s new home-hardening rule has centered on cost and enforcement, not the fire science behind it.

In a letter published in the San Francisco Chronicle, FortressFire’s Michael Ashker refocused the discussion on what determines whether homes ignite: the physics of embers and the vulnerabilities in the first five feet around a structure. His perspective brings the focus back to ignition physics and the practical steps that meaningfully reduce risk.

Wildfire doesn’t spread according to neighborhood maps or zip codes. It spreads through specific ignition pathways, most notably embers and combustible materials immediately adjacent to structures. Post-fire investigations consistently show that many homes ignite not because flames reach them, but because preventable vulnerabilities remain unaddressed.

That is why policies focused on the first five feet around a home are not arbitrary. They reflect established fire physics and decades of loss data showing what most often determines whether a structure survives.

Mitigation is most effective when it is collaborative. Homeowners should not be expected to interpret and decrease wildfire risk on their own. Clear, property-specific guidance grounded in rigorous, data-based assessment helps residents prioritize actions that measurably reduce risk, improving safety while also providing insurers with credible evidence of reduced exposure.

Wildfire resilience that is practical, evidence-based and transparent is achievable now. Delaying action only risks further loss.

Link to San Francisco Chronicle Article: https://www.sfchronicle.com/eastbay/article/berkeley-mandate-home-fireproofing-backlash-hills-21282309.php

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