Because foam board is flammable, I understand that in all cases, it must be
covered with drywall to make it fire resistant. This certainly would apply
in a furnace room, probably more than any other room.

"sid" wrote in message
...
Most of the basement is lined with Owens Pink Foam-board. If I use
this foam-board to insulate the wall of the furnace room, can I leave
it exposed ? Do I need to finish the walls ?

Thanks