Problem
Chimney leaks at the flashing, not always the flue
A stain next to a fireplace is often roof water that followed the flashing or a cracked chimney crown into the chase. The flue can be fine. Wide chimneys also need a cricket so water does not sit against the masonry on the high side.
Signs we look for
- Damp drywall or rust on the fireplace surround after rain
- White mineral staining on exterior brick at the roof line
- Missing or rusted counterflashing cut into the mortar
- A wide chimney with no saddle or cricket on the upslope side
Why it happens
Masonry and metal expand at different rates. Mortar joints in freeze-thaw markets open. A reroof that reused old flashing leaves a hidden gap. St. Louis brick homes and older Naperville two-stories show this constantly. Hail-dented flashing in Wichita is the same leak with a different cause.
What we do next
We inspect the step flashing, counterflashing, the crown, and whether a cricket is missing. The job may need a mason for new counterflashing. We write that split so you are not surprised by a masonry line item.
What not to do
Do not pour a tube of roof cement around the entire chimney as a permanent fix. It fails in a season and hides the joints we need to see.
Services that address this
Markets where we see this often
Related: All roof problems · Request an estimate.
People also ask
Do I need a mason and a roofer?
- Sometimes. Counterflashing cut into brick is masonry. Shingles and step flashing are roofing. The written estimate says which trades the house needs.
Topic cluster
More on repair versus replacement
Repair fits when the failure is isolated and the rest of the roof still has life. Replacement fits when wear or storm damage covers several slopes, leaks keep returning, or the deck is involved. The inspection answers that before anyone writes a contract. Full topic.
Next step
Request an inspection for this problem
Send the address, the storm date if you have it, and what you have noticed. We inspect, then give you a replacement or repair price. Your insurance company decides what they pay.