Aerial imagery maps hurricane wind damage and shows stronger building codes work
Massive storms like Hurricane Katrina in 2005, which caused more than $100 billion in damage, were once considered lifetime events. Increasingly, however, they are becoming the norm: a direct result of climate change, which has made large storms more frequent, intense and slower-moving, deepening their impact.
Aerial imagery has revealed that stronger building codes significantly reduce hurricane wind damage and its financial impact. After Hurricane Ian in 2022, 44% of insurance claims were for flooding, while 56% were for wind damage. However, predicting wind damage is challenging as there is no physical barrier that can shield communities like flood defenses.
In response, Florida implemented the 2001 Florida Building Code (2001 FBC) in 2001, which mandated stronger roof-to-wall connections, thicker roof decking, and impact-resistant windows and doors in certain areas. To assess the effectiveness of this code, researchers from Kyoto University and Kobe University analyzed high-resolution drone and satellite imagery of Hurricane Irma in 2017.
They used blue tarps covering damaged roofs as a proxy for wind damage and mapped wind damage across 1 million homes in eight South Florida counties. The study found that homes built under the new code were 22% less likely to experience wind damage, and when damage did occur, it was 27% less severe. Additionally, damaged homes that were sold before being repaired faced a 13.3% decrease in sale value, approximately $29,400.
Co-author Kenji Takeuchi hopes the research will contribute to disaster preparedness and climate change adaptation policies.
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