Hopefully, you’ve found this article before chimney leaks have become unmanageable. Many homeowners are unaware their chimney is a source of leaks, but loose chimney flashing is a common cause of unwanted moisture in a home.
As long as you’re comfortable securing yourself to and working on your roof, chimney flashing repair isn’t too difficult for the average homeowner.
What is chimney flashing?
Chimney flashing is two sheets of metal installed where the chimney meets the roof to create a watertight seal. Over time, weather can cause the flashing to pull away from the brick of the chimney or erode away.
Do I need to repair or replace my chimney flashing?
During your initial inspection, you’ll notice if the flashing has just pulled away from the chimney or is rusted or eroded in certain areas. If the flashing has pulled away but is still in fair condition, consider doing the repair yourself.
If the flashing is badly rusted or eroded, it will need to be replaced. Flashing installation involves removing and replacing shingles and securing flashing to the roof using specialized tools. We recommend calling a professional if your flashing needs a total replacement.
What materials do I need to repair my chimney flashing?
- Roofing cement
- Masonry nails or screws
- Putty knife
How do I repair my chimney flashing?
Begin by clearing out any leaves or debris that may have gotten between the flashing and the chimney. Then, use your chisel and hammer to remove old, hardened roofing cement from the brick so the flashing will lay as flat as possible on the chimney. Remove as much as you can.
Generously apply roofing cement between the flashing and chimney. As you put pressure on the flashing and new cement, use your masonry nails or screws to reinforce the flashing to the brick and cover exposed heads with roofing cement.
Once the flashing is flush with the chimney, applying more roofing cement to the top edge of the flashing. Smooth out this layer using a putty knife.