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How Chimney Crowns Protect Chimneys & Homes

Rain and moisture are the #1 enemies of modern chimneys. A well-built chimney includes various components that are designed to prevent incoming water. One of the most important of these components is the chimney crown.

Mercer County Chimney Services of Hamilton, NJ, would like to share a little about chimney crowns and how to make sure yours stays in great shape.

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What is a Chimney Crown?

A chimney crown is the solid slab that covers the entire top of a chimney, minus the flue opening. In order to operate effectively, the crown must be built so that it slopes downward toward its sides, with an overhang of approximately two inches. This design causes water to drain away from the vulnerable masonry below the crown.

Additionally, the crown must be constructed with top-grade concrete. Standard chimney mortar should never be used for crowns.

A well-built chimney crown will last for many years. But eventually, our harsh New Jersey winters and blazing summers will take their toll on the crown, like they do on just about everything.

A cracked or broken chimney crown will allow rain and melting snow into the interior chimney system, resulting in potentially extensive damage.

Here are some common questions about chimney crowns, along with answers from your Mercer County chimney experts.

Chimney crown FAQ

Q: How do crowns get damaged?

A: Old age is a common cause of damage. Other causes include pounding hail storms, lightning strikes and inferior materials used in the construction of the crown. A common problem in our region is the “freeze/thaw cycle,” in which water enters small cracks in the crown and then freezes and expands, causing the concrete to break and open up. 

Q: How can a damaged crown affect the rest of the chimney?

A: Water leaking into a chimney can lead to damage in:

  • Chimney masonry
  • Chimney liners
  • Fireplace dampers
  • Fireboxes
  • Roofs
  • Ceiling, flooring and walls

Crown leaks can also cause a dangerous mold growth in your home.

Q: How can I know if my chimney crown needs repair?

A: You can perform a visual inspection, but only if you feel safe and comfortable getting on the roof or a tall ladder. Look for cracks, which are typically the first sign that a crown is beginning to fail. The best option for most homeowners is to have a licensed chimney inspector look at the crown.

Q: Can I build my own crown if I have the right materials?

A: You can attempt it, but you probably don’t have the experience and training that chimney professionals bring to every repair and rebuilding project. Also keep in mind that inferior workmanship may void coverage from some homeowner’s insurance carriers.

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Q: Can a chimney crown be waterproofed?

A: Yes. There are industry-grade products designed to seal-coat chimney crowns and keep water from moving into cracks and breaks. 

The help your chimney crown needs

If your chimney crown needs to be repaired, sealed or rebuilt, the experts at Mercer County Chimney Services are standing by. We serve Hamilton, NJ, and all surrounding communities in Mercer County. Give us a call, or reach out with our handy contact form