"JoeSpareBedroom" wrote in message

Mind if I ask how old you are? I'm wondering how you couldn't know that
styrofoam produces toxic fumes when it burns.

Actually, not it doesn't. Other foam may, but Styrofoam is styrene plastic
and when it burns, produces soot (a lot of it), water, carbon dioxide)
About the same as burning fuel oil. Properly covered, it is useful for
insulation and even for Insulating Concrete Forms www.integraspec.com as an
example.

In any case, it should be covered with drywall. This is a poor application
being suggested by the OP.