Chimney Flashing Repair: 10 Step Guide To Fix Flashing

July 3rd, 2024 BY First American Roofing

Chimneys can be a great addition to your home, offering warmth, charm, and even increasing property value. Here are four benefits of having a chimney on your roof:

  1. Enhanced Aesthetics: A well-designed chimney adds character and architectural interest to your home.
  2. Energy Efficiency: Chimneys can significantly improve the heating efficiency of your home, reducing energy costs.
  3. Increased Property Value: Homes with functional, well-maintained chimneys often have higher market values.
  4. Ambiance and Comfort: A fireplace provides a cozy atmosphere, perfect for gatherings or quiet nights.

However, sometimes the flashing around your chimney may need repair. Follow this 10-step guide to get your chimney back in working shape.

Tools and Materials

Before you begin, gather all the necessary tools and materials to ensure a smooth repair process.

Step 1: Inspect the Existing Flashing

Begin by thoroughly inspecting the existing flashing around your chimney. Look for any signs of damage, such as cracks, rust, or loose sections. Identifying these issues early will help you determine the extent of the repairs needed.

Step 2: Remove Damaged Flashing

Using a utility knife, carefully cut away any damaged or corroded flashing. Be cautious not to damage the shingles or the chimney itself. Remove all debris and old roofing cement from the area to ensure a clean working surface.

Safety is key, so make sure to wear gloves and eye protection while handling sharp materials.

Step 3: Clean the Area

Use a wire brush to scrub the area where the new flashing will be installed. This step is crucial for ensuring that the new flashing adheres properly and creates a watertight seal. Remove any dirt, rust, or old cement thoroughly.

If you neglect to clean the area, the new flashing may not adhere correctly, and water may seep through, causing further damage.

Step 4: Measure and Cut New Flashing

Measure the dimensions of the areas where the new flashing will be installed. Using these measurements, cut the sheet metal to the appropriate sizes. Ensure the pieces fit snugly against the chimney and roof to prevent leaks.

It can be helpful to cut the flashing slightly bigger than needed, as you can always trim it down later for a perfect fit.

Step 5: Position the New Flashing

Place the newly cut pieces of flashing around the chimney, ensuring they overlap correctly to direct water away from the structure. Start with the base flashing, then add step flashing along the sides, and finish with counter flashing at the top.

The existing chimney flashing should act as a guide for placement, but if it is also damaged, use the measurements from Step 4 to determine proper positioning.

Step 6: Secure the Flashing

Using a hammer and nails, securely attach the flashing to the roof and chimney. Be sure to nail only at the edges to avoid creating additional holes where water could seep in. This step solidifies the structure and prevents movement.

Use caution, as hammering too hard can cause damage to the chimney or roof.

Step 7: Apply Roofing Cement

Once the flashing is in place, use a caulk gun to apply a generous bead of roofing cement along the edges and seams of the flashing. Smooth it out with a putty knife to create a continuous, watertight seal.

Roofing cement takes some time to dry, so be patient and avoid any movement or disturbance to the newly installed flashing.

a person is sealing joints

Step 8: Seal Joints with Roof Caulk

For added protection, seal all joints and edges of the flashing with roof caulk. This step is particularly important for areas where the flashing meets the chimney or roof valleys, where water is more likely to accumulate.

To apply roof caulk, load it into the caulk gun and carefully dispense it along the edges, smoothing it out with a putty knife for an even finish.

Step 9: Final Inspection

After completing the repairs, conduct a final inspection to ensure all flashing is securely in place and sealed correctly. Check for any gaps, loose sections, or missed spots in the roofing cement and caulk.

If you find any issues, make the necessary flashing repairs before proceeding to the final step.

Step 10: Clean Up and Monitor

Clean up any debris or leftover materials from your work area. It’s also a good idea to monitor the repaired flashing over the next few weeks, especially after heavy rain, to ensure it remains watertight.

Annual inspections and maintenance can help prevent future flashing issues and ensure your chimney remains in good condition.

Roof Flashing Repairs Made Easy

Repairing chimney flashing may seem daunting, but with the right tools and a detailed guide, it’s a manageable DIY project. Properly maintained flashing is crucial for protecting your home from water damage and ensuring the longevity of your chimney. By following these steps, you can take pride in knowing you’ve contributed to the maintenance and safety of your home.

If you need professional assistance or have any concerns about your roof’s condition, don’t hesitate to connect with First American Roofing & Siding. Our experts are here to help with all your roofing needs, ensuring your home remains safe and secure.