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Polizi is right on in his comment, I have been a career firefighter for 28 years, the last 12 as Asst, Chief/Fire Marshal. The UBC (Uniform Building Code) calls for the foam to be marked combustible when it falls under ceratin conditions. They rate it for flame spread< 25, smoke development <450 and ignition temp 650 deg. Wood's igniton temp is 455 deg. The materail must be tested usually by UL (Underwriters Lab) or FM (Factory Mutual). There are some other testing agencies but these are the most common. In the 70's or early 80's, UL tested polyurathane foam insulaltion, different than the extruded polystyrene, and found it safe. Only trouble they tested it when it was laying flat. When it was used vertically on a wall it burnt like crazy. Bottom line, the extruded polystyrene is safe, I use it myself and hvae no great concerns about it's use.
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