Originally Posted by
Nick Ostrowski
Not sure about the cause or remedy in pics 1-3 John but pic #4 defintely needs a new flue liner.
Agree.... I'm inclined to think the crack is not a big deal. I'm guessing 60's construction - probably had no chimney cap ever and the liner is shot. I'd be curious to see what the top looks like. I'd bet either totally shot or just rebuilt.