Dangers of a Cracked Crown

Chimneys are essential components of many homes, providing ventilation for fireplaces and heating systems. However, one often-overlooked part of a chimney is the crown. The crown is a concrete barrier at the top of the chimney that protects the flue from the elements. When the crown becomes cracked, it can pose severe risks to the chimney and the home.

What Causes Cracks in a Chimney Crown?

There are many factors that can contribute to cracks in a chimney crown, but the following are the most common:

Weather

Water is the mortal enemy of masonry structures like chimneys. Exposure to seasonal weather changes, such as freezing temperatures, heavy rainfall, and strong winds, can cause the crown to deteriorate and develop cracks. Even a lightning strike can take out a chunk of the crown and start a fire if flammable creosote is present.

Missing Chimney Cap

A chimney cap is like a hat for the chimney, deflecting rainwater away from the flue and providing additional protection for the crown. When the chimney cap is damaged, missing, or dislodged, moisture can lead to surface cracks in the crown.

Foundation Settling

Foundation settling is a big issue with aging homes, especially in older neighborhoods. As the foundation settles, the additional stress on the chimney can result in a cracked crown.

Poor Installation 

If the crown is not installed correctly with the proper slope and leading edge, it will not have adequate protection from the elements. In addition, low-quality crowns, or those built with low-grade materials, may fail prematurely.

Tree Roots

This is another common issue found in older homes. Trees planted too close to the chimney’s foundation can cause structural problems, such as a cracked crown, as the tree grows and its roots expand underneath.

Even small cracks in the crown are a cause of concern. That’s because these small cracks will continue to develop larger cracks that can pose several dangers:

1. Water Intrusion: Cracks in the crown allow water to seep into the chimney, leading to moisture damage, mold growth, and structural problems.
2. Carbon Monoxide Poisoning: If the chimney is not venting properly due to a cracked crown, poisonous carbon monoxide gas can build up inside the home, posing a serious health risk.
3. Chimney Collapse: In severe cases, a cracked crown can lead to the partial collapse of the chimney, which can cause significant damage to the home and potentially endanger family members.

Common Signs Your Chimney Crown is Cracked

1. Visible Cracks: Crown damage is not always apparent at ground level. When a chimney professional climbs a ladder to the top of the chimney, visible cracks in the concrete confirm the damage.
2. Water Leaks: The sound of dripping water with no clear signs of entry is a strong indicator that moisture may be leaking internally through a cracked crown.
3. Flue Liner Cracks: A rusting metal liner or flaking clay tile liner may be due to moisture damage from a cracked crown.

Repairing a Cracked Crown

If you suspect your chimney crown is cracked, it must be inspected by a Certified Chimney Sweep® like the pros at Chimney Solutions. They have the experience to evaluate the damage and recommend the appropriate repairs, including resealing, repairing, or rebuilding the crown.

Cracked Crown Repair & Rebuilding Near Me

Is a cracked crown compromising your chimney? Annual chimney inspections are vital to prevent masonry damage. Chimney Solutions specializes in masonry services, including repairing and rebuilding cracked chimney crowns. Call us today to schedule an appointment in Metro Atlanta, Chattanooga Metropolitan Area, and surrounding communities. Or, complete our simple contact form to book your appointment online.