First of all, you're not looking at nothing but ash. You're looking at ash covering whatever is under it. Probably those refrigerators you're wondering about, in various degrees of disrepair since any wooden flooring under the refrigerator, and the electric cords, and the door handles, and the feet, and the plastic inside of it, would have all burned and melted long before it was completely ensconced in ash.
Second, as I said in my previous response, shingle roofs CANNOT withstand the temperatures of wildfires, which can get up to almost 1500°F. California was experiencing hurricane-force winds of up to 100MPH, so basically it was a neighborhood-sized flying blowtorch, as someone else referenced upthread.
Doors aren't made of metal. Glass melts, air pressure shatters glass, and the flames just waltz right into the houses, burning them to a crisp. Garage doors are not made of stucco, and many stucco homes have wood frames. When you surround a home with 1400 degrees of fire, it will burn.
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