Cracked chimney crowns after winter freezes
Why it happens here
Water pools on a flat or poorly sloped crown, freezes overnight, and expands. After a few cycles the crown cracks like a sidewalk, and every crack lets water into the flue and the house.
Our approach
We rebuild crowns with chimney crown mix and form a proper slope and overhang so water sheds away from the flue. We also seal the crown-to-brick joint, which is where most North Braintree leaks start.