I'm trying to solve an insulation problem. I've got a zero-cleatance wood fireplace, with the metal flue (10" round?) going through the roof inside of a rectangular 2 foot by 4 foot plywood chase. I discovered that there is no insulation in the chase, and indoor heated air is virtually free to flow up the chase and out the top. (The chase is interior, not on an exterior wall, and the interior sides of the chase were not insulated. With the essentially open chimney top, this seems equivalent to an uninsulated exterior wall on the inside of the house). I'd like to interrupt the air flow somwhow. Code says you can't put wood (or other combustables, I assume) within 2" of the flue. I'd like to pack the chase at the rafter level with fiberglas insulation, which means the fiberglas will be in direct contact with the metal flue. Is this a potential problem? I don't consider fiberglas combustable, but what do I know. If it is a problem, any other solutions come to mind?
- posted
20 years ago