From what I am hearing, the outside isn't necessarily flammable, it's the ventilation stuff that captures fire/embers and tends to hold them in a place. So, lacking a place to collect embers and get hot enough to burn, pretty much anything could work for a while. Ever burn a roof shingle? Trick is getting them lit, after that........
Otoh, a thin cedar shake that's 50 years old is super kindling for all the above reasons.
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casual notes from the underground:There are some "experts" out there that in reality don't have a clue as to what they are doing.
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