Thanks for the detailed reply! I was afraid that re-doing the chimney's stone was the permanent answer ... if that's what it takes, that's what I'll do! Thanks again,
John
I have a metal double-wall flue that runs from my fireplace through the roof. It exits through a "fake" chimney ... i.e., the chimney looks like it is made of stone. As I understand the construction, it is essentially a box built from wood framing and plywood, then some sort of coating was...