is supported by readers and may earn an affiliate commission.

Rather have a pro do it for you?

Tools and Supplies to Seal a Chimney Flashing
1 Chimney flashing kit
2 Ladder
3 Roofing cement
4 Trowel
5 Caulk gun
6 Sealant
7 Roofing nails
8 Hammer
9 Wire brush
10 Safety goggles

How to Seal a Chimney Flashing

Step-by-Step Guide: Sealing Your Chimney Flashing Like a Pro

Sealing a chimney flashing is an important task that can help prevent water damage and leaks in your home. If you're looking to seal your chimney flashing, follow these simple steps:

Step 1: Clean the Flashing
Before you begin sealing the chimney flashing, it's important to clean it thoroughly. Use a wire brush or scraper to remove any debris, rust, or old sealant from the flashing. You can also use a pressure washer to clean the flashing if it's particularly dirty.

Step 2: Apply Sealant to the Chimney
Next, apply a layer of sealant around the base of the chimney. Use a high-quality sealant that's designed for use on chimneys and can withstand high temperatures. Apply the sealant in a continuous bead around the base of the chimney, making sure to cover any gaps or cracks.

Step 3: Install the Flashing
Once the sealant has been applied, it's time to install the flashing. Place the flashing over the sealant and press it firmly into place. Make sure that the flashing is flush against the chimney and that there are no gaps or spaces between the flashing and the chimney.

Step 4: Secure the Flashing
To secure the flashing in place, use roofing nails or screws. Place the nails or screws along the edges of the flashing, making sure to space them out evenly. Be careful not to over-tighten the nails or screws, as this can damage the flashing.

Step 5: Apply Sealant to the Edges
Finally, apply a layer of sealant along the edges of the flashing. This will help to further seal the flashing and prevent any water from getting in. Use a caulking gun to apply the sealant, making sure to fill in any gaps or spaces.

By following these simple steps, you can effectively seal your chimney flashing and prevent any water damage or leaks in your home. Remember to use high-quality materials and take your time to ensure that the job is done properly.