Best way to close off an old furnace chimney in cold climates?
We will be installing a new furnace in a new location in an older home (’60’s). The old chimney stack is located in a small bump out, about 1’x1′. We are considering sealing the chimney stack at the bottom and leaving the top of the stack open (as-is). The chimney cap at the top is clay and I assume the stack is clay, but haven’t checked yet.
The house and the bump out will stay clad in bricks – so taking out the bump out isn’t an option for us.
Any thoughts on the subject?
Are there any breathable caps for old chimneys to keep out the critters and the water/snow, but allow moisture to escape? If so, would you do both?
Looking forward to your input!