On Wed, 30 Jun 2010 11:42:15 -0500, "HeyBub"
wrote:

Shaun Eli wrote:
1. Drywall IS for fire suppression, but I can't imagine how it would
be any use in a basement. The dirt on the other side won't burn.

The dirt won't burn but if a fire starts in the basement the foam
insulation would burn, hence the need for drywall.

Good point, but it depends on the foam. For example, polystyrene (packing
peanuts) doesn't burn. It will char and melt, but won't support combustion.

But it WILL produce poisonous gas if held to a flame. Styrene in
particular MUST be covered with a flame barrier by law, and for good
reason.

I would suspect the type of foam used for insulation is of the non-flammable
variety.

And your suspicion would be wrong, and dangerous.