WHOA.....I never would have thought! Thanks for doing the service of posting this. Actually, it would be good if all the garden sites had this piece of info posted.
dell

looks suspicious to me. if it began on the deck, why is the deck unaffected while the rooftops are ablaze? appears to have started in the attic, based on those photos, and burned from the top downward.
if i were an insurance agent, i would look into it further.