How to Repair a Damaged Chimney Crown [5+ Steps]

  • If your chimney crown is cracked or deteriorating, you may need to have it repaired or replaced
  • Freeze-thaw damage is a common problem that can happen to chimneys. The crown of the chimney is especially vulnerable to this type of damage, as it can crack and deteriorate over time.
  • This is caused by the freeze and thaw cycle that happens when the weather drops below freezing. The best way to prevent freeze-thaw damage is to make sure that water doesn’t get absorbed into the crown in the first place.
  • If the damage is already done, then it’s important to repair it as soon as possible.
  • One way to protect your chimney crown is to use an elastomeric coating
  • Apply ChimneyRx Brushable Crown Repair in two coats, making sure to smooth it out evenly
  • Don’t forget to remove the duct tape when you’re finished!

When I first purchased my New England home, I knew that there were a few repairs that needed to be done.

The roof needed to be replaced, the windows needed to be updated, and the chimney needed to be crowned.

I wasn’t sure how to go about repairing the chimney crown, so I did some research online and found a few local contractors who could help. I eventually decided to work with one of them, and they were able to do the repair very quickly and efficiently.

The problem was that the previous owner had neglected to properly maintain the chimney, and as a result, the crown had cracked and begun to deteriorate.

The contractor that I worked with was able to repair the damage and prevent further deterioration by using an elastomeric coating.

This coating will remain flexible over time and will protect the chimney from future freeze-thaw damage.

I am very happy with the results of the repair and would recommend this type of coating to anyone who is looking to protect their chimney from future damage.

A chimney crown is an aluminum covering on the top of a chimney designed to strengthen its structure. The covering is often made with a pipe and cement mixture lasting many years.

However, when this pipe and cement mixture wears out over time, it can break down and expose the metal in the crown.

Repairing a damaged chimney crown is imperative because it will prevent further deterioration of your home’s interior and protect you from fire risk. If a chimney crown is damaged, the risk of fire is increased.

Understanding Damage to Crowns

A chimney crown is designed to withstand high temperatures and strong winds. However, the cement mixture can break down and expose metal elements at its edges over time.

These edges are prone to corrosion, which leads to damage to your chimney crown. If your chimney crown has been damaged by rust or corrosion, you will notice that it has a yellowish tinge.

It may also appear cracked or broken at some point from the inside out (near the top). With this kind of damage, you will likely see a spray of water when you shower, which is a sign of leaks in your chimney.

If the leak is not fixed, it will cause rot and mold to develop in your walls and ceilings over time.

How to Repair a Damaged Chimney Crown

1. Clean the Rough Plaster

If you notice a yellow tinge to your chimney crown, then there is likely no protection of your wall or ceiling anymore.

The time to clean and paint it is now. The best way to get rid of a yellowish tinge from the top of your chimney crown is by first removing all clumps of debris from the surface. You can use a wire brush, putty knife, and sponge.

Remove debris like nails or screws with a screwdriver and other sharp objects like knives or scissors before they puncture your walls or ceiling.

2. Clean the Crown

Once you have removed all the debris and materials on top of your crown, you can use a toothbrush and water to scrub out all remaining grooves and holes. You can also use a pressure washer to clean it thoroughly on dry days.

3. Repair Cracks

If there are cracks on your chimney crown, then it is wise to repair them before painting. To do so, apply a layer of metal patching compound on the cracks with a putty knife or trowel before painting or caulking the rest of your chimney crown.

4. Paint the Crown

Once you have finished repairing your chimney crown, use a paintbrush or roller to cover it with a layer of paint meant for aluminum surfaces. The paint sprayer can also be used for this purpose.

5. Protect the Crown from Rusting

Once you have finished painting your chimney crown, there is one more thing that you must do: protect it from rusting. To do this, apply a sealant to your chimney crown. This sealant can be applied with a roller or brush before you paint or with a sprayer.

6. Clean up

You can finish off this repair by cleaning up the excess paint or sealant from your chimney crown.

This can be done using a damp sponge and warm water. Do not allow wet paint or sealant to dry on the crown before cleaning it thoroughly with a wire brush and toothbrush. It is best if you do not clean the chimney crown with water because it may leave rust stains.


A chimney crown is essentially a large cap that covers your chimney. Not only does it help protect your home from damage due to fire, but it also protects you from developing leaks and mold in your walls or ceilings as time goes by.

To check the quality of your crown, you can use a magnet or metal detector to check for any signs of rust. If you notice any signs of rust, then you should get your crown repaired as soon as possible to avoid leaks and dangers that a damaged crown brings.

Eugene Duke Pic

Hi, my name’s Eugene Duke and I love sitting by my fireplace reading a book and sipping on an adult beverage. Do you have a fireplace in your house? I’ll help you figure out the best type and style of fireplace for your home.


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