Crown cracks causing persistent chimney leaks
Why it happens here
Green Knoll winters cycle above and below freezing repeatedly, and that freeze-thaw action cracks the mortar crown. Once cracked, water runs down the flue and into the house.
Our approach
We rebuild the crown with chimney crown mix, add a proper drip edge, and seal it. We also check the flashing while we are up there, because the two fail together more often than not.