Chimney Flashing Repair- How to Fix Chimney Flashing Leaks

Chimney Flashing Repair

Firstly, where is the water entering?

Here at my chimney repair and sweeping company, we treat every water problem as a process of elimination. Even the most trained chimney veterans can have difficulty pinpointing exactly where damaging water is entering your home. A chimney or roofing professional will often perform a water test


This flashing was installed improperly, with no counterflashing, and will surely leak.
This flashing was installed improperly, with no counter-flashing, and will surely leak.


which you can actually perform yourself. Starting at the base of your chimney soak a few feet. Wait fifteen minutes to see if any water enters your home and then soak a portion of the chimney a little bit higher then a little bit higher until you can either pinpoint where water is entering on the chimney or rule out the water entering through the brick of the chimney.

Is it the chimney flashing?

Another very common point of entry for water is the chimney flashing. Chimney flashing seals the void between the roof and the chimney, but often times leaks. Over time, water erodes away the watertight finish that sealed the flashing or the flashing literally rusts away from the roof. Other problems can occur with the flashing that may cause leaks, and fixing it isn’t impossible. You can absolutely save some money by performing the repair by yourself, you just need to be sure that you use quality products.

ChimneySaver FlashSeal Flashing Repair is a great product to use. It is durable and, when used with the

chimney flashing repair
This flashing was repaired with FlashSeal and is now watertight. No water can enter the home.


FlashSeal Reinforcement Fabric it comes with a seven year warranty. To repair your flashing with FlashSeal, you first need to clean the area of any dirt and debris to allow the product to work as efficiently as possible. After the clean area dries, apply a thin base coat of FlashSeal that covers the entire flashing area and extends a few inches above the flashing line. After this dries apply a layer of FlashSeal Reinforcement Fabric over the entire area and finish with a top coat of the FlashSeal product.

You will need at least twelve hours of dry weather in order for this product to heal properly. I also recommend applying a layer of water repellent over your repair and over the entire chimney to further safeguard your repair and protect your home from future water damage.

Clay Lamb
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3 thoughts on “Chimney Flashing Repair- How to Fix Chimney Flashing Leaks

  1. As a masonry contractor in the Seattle area we come across this type of problem quite often. One word of caution would be that this type of repair is of a temporary nature and will have to be redone in a manner of a few years. when it does fail you won’t know it till it let in more water and does more damage. Also as a matter of resale a home inspector would note that the Fireplace Flashing was missing. a much better way of repairing this Chimney would be to cut in some new fireplace Flashing, this could be done in about 1 hours time and you would have a much better rerpair that could last for 25 years. Just a though!


  2. Sure, this isn’t meant to be a permanent fix. The ideal solution would be to install new flashing. However, we’ve had pretty good success here in Cincinnati with FlashSeal in the event that a customer doesn’t want to pay us to install new flashing. It usually holds up for close to 7 years, then it probably either needs to be recoated or new flashing installed. Good point Tim.

  3. When diagnosing a chimney leak, check the cement cap at the top as well. Most have a “crown” that funnels water away from the home, and over time the cap and mortar joints may become cracked due to structural shifting.

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