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Reading this thread jogged my memory. When I fixed up my basement I put the foam board against the concrete block walls and put paneling over that. I remember reading a pamphlet at the store (one of the big-box home supply stores) about use of the foam board. It recommended that it be covered with a nonflammable material (plaster board was used as an example). I suppose maybe some areas made this recommendation part of their building codes, which might be why it's not sold in some areas (??). <br /> <br />Anyway I decided to check its flammability. Not more than ten minutes ago, I tried to burn a piece of it outside in my back yard. I used a standard propane torch and a piece of Owen's pink foam. As long as the propane flame was in contact wioth the foam, the foam burned with a yellow flame that produced heavy, sooty, black smoke. After taking the propane flame away from the foam, the yellow flame self-extinguished itself in less than two seconds. I would assume that breathing the heavy black smoke would not be very healthy. I then tried this same experiment on a piece of white bead board. Pretty much the same thing happened - heavy black smoke - but this time it took about ten seconds for the flame to self-extinguish. I didn't have any blue foam to try.
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