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What is chimney flashing and when to repair it

Jun 13th, 2017 // Chimney Flashing Repair

Having a fireplace inside your home is always a nice thing, especially when the weather outside is frightful. But, having a fireplace comes with a price. Though not everyone experiences problems with their chimneys, homeowners should be aware of potential problems with chimney flashing. But first, let’s look at the basics.


What is chimney flashing?

Chimney flashing is a sheet of metal installed around the area where the chimney meets the roof. Flashing ensures that the connection between the chimney and roof is watertight. Though these metals last for some time, they do have an expiration date that varies by wear.  


How is chimney flashing installed?

Chimney flashing consists of two metal panels. The base flashing is installed underneath the shingles and bent in an L-shape upward against the brick chimney. Be sure your roofing contractor checks for breaks, cracks, or holes before moving forward. Once the first metal panel is installed, the second piece of flashing is set in place. We call this counter flashing. This counter flashing is bent down over the base flashing and embedded into a chimney mortar joint. This panel seals the top portion of the base flashing.


Installation of chimney flashing can be challenging and that is why we recommend you enlist the help of a professional roofer.


How to check for leaks around my chimney

Leaks from your chimney are not always so easily detected, but they can cause major structural damage if not taken care of readily.  When moisture enters your roof it can penetrate your attic and possibly the ceiling area. Consistent moisture is known to cause wood rot, roof damage, attic issues, and drywall damage around the ceilings. If you notice any obvious issues, use safety precautions when accessing your attic or roof to check for leaks.


When to repair or replace your chimney flashing

Now that you know what chimney flashing is, how it is installed, and how to check for leaks, when do you know when to repair or replace it? Since weather can be brutal on your chimney flashing, you will need to replace flashing that is missing or eroded. If you are having shingles repaired or replaced on your roof, it is always a good time to check on the flashing.  Even though most flashing is made from durable metals, older chimney flashing might be rusted. Replace it if you notice this issue. And, for older homes, since chimneys are not attached to the frame of your house, settling can cause a disconnect and shifts which open your home to leaks.


Roofing can be a tricky business, but it shouldn’t be hard. Be certain that your roofing contractor is licensed and insured with plenty of positive reviews. For all of your roofing needs, call us for a free quote.

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