When I had my chimney replaced I did not get a liner even though the contractor insisted I needed one. "If it gets real cold, there will be condensation."
sheesh, how cold can it get???
I got a similar situation. Not nearly as bad looking. Condensation could occur in the 40-50 degree range with gas furnace.
Greg
Well, I guess there is not too much I can do until the weather warms up.
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