Leaking chimney flashing on masonry chimneys
Why it happens here
The masonry chimneys on these 1920s homes expand and contract with temperature swings. The flashing sealant cracks, and the counter flashing pulls away from the brick. Once water gets behind the flashing, it runs down the chimney into the attic.
Our approach
We remove the old counter flashing, clean the masonry, and install new copper or galvanized counter flashing. We seal the top edge with polyurethane sealant and test with water before we leave.