Dangers of a Cracked Crown

Before we jump into the dangers of a cracked chimney crown, let’s discuss what exactly the chimney crown is and where it is located. A chimney crown is the protective cover or cap, made of masonry or concrete. The crown covers the top of the chimney. It is the first defense against water damage. The design is meant to direct water away from the structure of the chimney to prevent leaks. A crown will also extend the life of the chimney.  

A cracked or damaged chimney crown may cause danger to your chimney and home. Mostly related to water damage and structural instability. The intrusion of water can lead to many issues. These include damage to the interior of the chimney, such as the flue liner. Structural damage is a big concern as well. Debris and small pests can also enter from a cracked chimney.

Water Damage-

• Masonry- Water will be detrimental to the bricks and mortar. Once water enters the masonry, the freeze/ thaw effect sets in, expanding the cracks.
• Flue Liner– Once damaged by water, potential leaks, cracking, or corrosion may occur. The flue is what vents the smoke and gases out of the house.
• Rust and Corrosion- Water corrodes the metal components of the fireplace and chimney. 
• Mold and Mildew- This can be a health issue. Once moisture gets into the chimney, mold and mildew will grow.

Structure Damage-

• Chimney Collapses- Weakening of the masonry from the freeze-thaw cycle will occur, causing, in some cases, severe structural damage. 
• Falling Debris- Cracked chimney crown parts can fall off and hurt anyone near the chimney.

Other Concerns-

• Carbon Monoxide (CO) Poisoning- Without proper ventilation of gases, including carbon monoxide, it can be deadly. Carbon monoxide is odorless and colorless. A cracked flue will allow dangerous gases such as CO to get into the home.
• Efficiency- A damaged flue liner will affect the efficiency as the heat won’t vent properly. This will reduce heating efficiency and increase energy costs. 
• Debris and Pests- Small animals, leaves, and twigs can enter the chimney if a chimney crown is damaged with cracks. This may potentially cause a blockage, increasing the risk of a chimney fire.

The chimney crown is an important part of the entire chimney structure. Once there is a crack in the crown, it may cause trouble in many other parts of the chimney, including the flue liner, masonry, and bricks.

A damaged chimney crown should be looked at as soon as possible by a qualified chimney professional. Waiting will only bring on more costly repairs and prevent more serious problems.

Look no further than Chimney Solutions Indiana! Since our very first customer, we’ve been committed to delivering the highest level of customer care and the most professional and reliable chimney and fireplace services. Our technicians are expertly trained and certified by the Chimney Safety Institute of America (CSIA), so there’s no aspect of chimney or fireplace service, installation, repair, or troubleshooting we can’t help you with.