The roofing deck in this video is made of expanded polystyrene (EPS). It's a packaging foam. With the best roofing materials?those that receive an A rating?flames spread no more than 6 feet in 10 minutes during FM Global's test. But the folks here wanted to put on a show for the cameras, and so they lit up some EPS, which burns all of its 8-foot length in just 2 minutes.
The machine off to the right simply contains a fan that the workers blow toward the flame at about 12 mph, which simulates fire and embers blowing onto a roof during a wildfire.
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