The Dangers of Damaged or Missing Flashing

When Aelite Chimney Specialties is diagnosing water leaks, we look at the area where the chimney meets the roof. Since this area is one of the most vulnerable spots for water leaks, it should be protected by a flashing system. However, we often find chimneys that do not have any flashing installed. We also see many chimneys with damaged flashing systems, and these chimneys have suffered from water penetration damage that could have been easily prevented by a customized and well-built flashing system. This water leak preventive chimney component works well to keep water out of your chimney and home.

What is chimney flashing?

The Dangers of Damaged or Missing Flashing img - Chicago IL - Aelite ChimneyA flashing system consists of metal sheets that are wrapped around the chimney at the point where it meets the roof. Its purpose is to keep water from accumulating in this area and possibly leaking into the chimney. Flashing should be built so that water will run off away from the chimney.

How should flashing be installed?

One of the biggest sources of chimney water leaks is improperly constructed flashing. For flashing to work correctly, it is essential, according to This Old House, that there are two layers of metal sheeting used. The first layer, step flashing, consists of L-shaped sheets of metal that are embedded into the roof’s shingles and then lapped up the side of the chimney. Counterflashing is the second layer of metal sheets. It is cemented into the mortar of the chimney and folded over the top of the step flashing. Many times, the corners have not been properly finished. It is very important to adequately caulk any gaps in each corner of metal sheeting layers. If the corners have not been properly sealed with caulk, water from rain, ice, and snow can get into gaps.

How does flashing get damaged?

Strong storms can cause metal sheets to bend away and break loose from flashing systems. Wild animals like raccoons can also pry open loose flashing when trying to get into a chimney to nest. Poor construction can also lead to damaged flashing. You can trust Aelite Chimney Specialties to be sure your flashing system is built properly.

Has your flashing system been damaged over the years? Contact us at Aelite Chimney Specialties to learn more about our customized flashing construction and repair services that we provide to residents in the Chicago area.