How To Repair A Chimney Cap

Lead Image for How To Repair A Chimney Cap
  • 8-12 hours
  • Intermediate
  • 350-600

If your chimney is older or if you haven't cleaned it in a while, repair your chimney cap to keep it looking new. Your chimney cap or "crown" helps protect your chimney from deterioration over time. A well-kept chimney is not only functional and attractive but can also raise the curb value of your home.

Step 1: Prepare the Area

You will need to do some manual labor on top of your roof. Lay a tarp under the area where you will be working so that you don't damage other parts of your roof or home while you repair your chimney crown.

Step 2: Remove the Crown

Use a hammer and chisel to slowly break the broken crown away from the rest of the chimney. Start from the outside and try not to break anything near the flue. Be very careful, especially in this area. Collect the broken pieces of the crown in a bucket.

Step 3: Create a Crown Mixture

Go down to the ground to mix your cap mixture. Mix it in a wheelbarrow with a hoe. Slowly add water until it gets to the consistency that you require. Then mix in the bonding agent.

Step 4: Apply Cement

Carry the cement up the ladder in a bucket. Apply the crown mixture to the chimney with a trowel. Spread it out evenly. Take your time and go around the entire flue.

You will need to work quickly before the mixture hardens. To keep bubbles out and consistency high, mix the solution with the trowel between applications.

Step 5: Leave Enough Room

Leave about 2 inches on top of the crown for the flue to stick up.

Step 6: Slope

You will want to slope the flue in a pyramid shape. Take your time and smooth out the cap from the top, right next to the flue, down to the bottom, farthest out of the flue. This will help drain water away from the chimney, so make sure that you make it smooth and even. You do not need to measure it, but the better it looks, the happier you will be with it.