Flashing failure around chimneys and walls
Why it happens here
Freeze-thaw cycles push water into small gaps around flashing. The water freezes, expands, and opens the gap wider. After a few winters, the flashing pulls away from the chimney or wall. This is the number one leak source we find in Rossford.
Our approach
We replace the step flashing and counter-flashing rather than patching over it. We use copper or stainless steel where the budget allows. Then we seal the joints and test with a hose before we leave.