Cracked crown letting water into the chimney
Why it happens here
Robertsville's freeze-thaw cycle widens hairline cracks in the crown every winter. Once water gets in, it soaks the brick and shows up as a ceiling stain weeks later.
Our approach
We rebuild the crown with a flexible crown mix, seal it with ChimneySaver, and check the flashing at the same visit. That combination stops the leak and prevents a repeat next winter.