Surprise surprise x 3
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Surprise surprise 1. A fancy McMansion subdivision goes into the middle of a forest and then gets burned. Surprise surprise 2. The houses with cedar roofs burned. Slate and tile roofs didn't burn. Surprise surprise 3. Google ad placement is smart as usual. You can almost hear the ad saying "I tried to tell you!"
Non-flammable roofs wouldn't help in a full-scale firestorm, but in the more common situation where embers are blowing around, the roof makes ALL the difference.