Repair Chimney Flashing: 10 Easy Steps To Get It Fixed

How to Repair Chimney Flashing

Chimney flashing is an essential part of your roof’s structure. It acts as a seal between the chimney and the roof, preventing water from seeping in and causing damage to your home. 

Over time, however, the flashing can become damaged or worn out, leading to potential leaks and further issues. Repairing your chimney flashing is a crucial task to ensure the integrity of your home.

Properly installed flashing helps prevent water leaks and protects your roof from damage.

For this, it’s vital to know how to repair chimney flashing can save you money on costly repairs and prevent any potential damage.

What Is The Chimney Flashing?

What is the Chimney Flashing

Chimney flashing is a metal or rubber material that creates a watertight seal between the chimney and your roof. It is typically installed at the base of the chimney and runs up along the sides, creating a barrier against water and debris. 

It is necessary because it helps to prevent water from entering your home through the chimney. Without proper flashing, rain and melting snow can seep into the cracks and crevices around your chimney.

Signs That Indicate You Need To Repair Your Chimney Flashing

Signs That Indicate You Need to Repair Your Chimney Flashing

Here are the signs that indicate you need to repair the leaking chimney flashing. These various noticeable issues should prompt immediate attention.

  • Rust spots on the flashing
  • Cracks or breaks in the flashing material
  • Gaps between the flashing and the roofline
  • Water stains on the ceiling near the chimney
  • Peeling paint or wallpaper around the chimney
  • The presence of pests like birds or squirrels near the chimney
  • Visible water leaks during chimney leaks in heavy rain or snow
  • Musty odors coming from the fireplace or chimney area

10 Easy Steps To Repair Your Chimney Flashing

10 Easy Steps to Repair Your Chimney Flashing

Repairing chimney flashing can be a daunting task, but it is important to address any issues as soon as possible to prevent further damage. Here are the steps you can follow to repair chimney flashing:

Inspect The Flashing

Before starting any repairs, thoroughly inspect the flashing for rust spots, cracks, or breaks. This will help determine the extent of the roof damage signs and what materials you may need for the repair.

Gather Necessary Materials

You will need new flashing material, a chimney flashing repair kit, roofing cement, a caulk gun, a putty knife, a wire brush, and a ladder.

Clean The Area

Use a wire brush to remove any debris or rust from the surface around the chimney where the new flashing will be placed. Then use a damp cloth to clean the area and allow it to dry completely.

Cut New Flashing Material

Measure the length of the chimney where the flashing will be placed and cut a piece of flashing material that is about an inch longer on each side.

Install New Flashing

Apply roofing cement around the base of the chimney where the new flashing will be placed. Then carefully place the new flashing over the cement, making sure it is flush with the roof.

Secure In Place

Use roofing nails or screws to secure the flashing in place, making sure they are evenly spaced and fully secure.

Seal Edges

Use a caulk gun to apply chimney flashing sealant along any edges or gaps between the flashing and roof surface to prevent water from seeping through. Smooth out the sealant with a putty knife for an even finish.

Cover Nail Heads

Use roofing cement to cover any exposed nail heads on the flashing, as well as any other gaps or seams that may have formed during installation.

Clean Up

Once everything is in place and secure, clean up any debris or excess materials from the roof and surrounding area.

Regular Maintenance

It’s important to regularly inspect your flashing for any signs of damage or wear and tear. If you notice any issues, it’s best to address them immediately to prevent further damage.

How Much Does It Cost To Repair Flashing Around A Chimney?

How Much Does it Cost to Repair Flashing Around a Chimney

The bad chimney flashing repair cost can vary depending on the extent of the damage and the type of flashing used. On average, homeowners can expect to pay between $200-$500 for repairs. 

However, if there is extensive damage or if specialized materials are needed, the cost could be higher. It’s best to get quotes from several contractors to compare prices and choose the most reasonable option.

When To Replace Chimney Flashing?

When to Replace Chimney Flashing

Chimney flashing leak repair should be replaced if there is visible damage, such as cracks or gaps, or if it is no longer properly sealed to the chimney. 

It is also recommended to replace flashing if it has been in place for more than 20 years, as it may start to deteriorate over time. 

Regular inspections of the flashing can help identify any potential issues and determine when a replacement is needed.

What Is The Best Product To Seal A Chimney Flashing?

The best sealant for chimney flashing is a high-quality, weather-resistant sealant. Silicone or urethane-based sealants are often recommended as they provide a strong and long-lasting bond. 

It is important to choose a product specifically designed for chimney repair and follow the manufacturer’s instructions for proper application. 

Additionally, regularly inspecting and maintaining the bad chimney flashing sealant can help prolong its effectiveness and prevent any potential leaks.


Repairing chimney flashing on your roof is a crucial task that requires attention to detail and expertise. It’s not just about fixing a problem; it’s about safeguarding the longevity and functionality of your home. When you notice an issue, don’t hesitate – repairs should be carried out promptly to prevent further damage. 

If you need assistance with chimney flashing repairs, DKG Roofing is here to help. Our team has the skills and experience to ensure your roof remains in top condition. 

To learn more or to schedule a service, please contact us at (940) 497-2833. We’re ready to help you maintain the integrity of your residential roof, one repair at a time.

About DKG Roofing

With over two decades of serving homeowners in North Texas and Denton Roofing, DKG Roofing has established itself as a highly sought-after roof repair and replacement contractor.

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