Dangers of a Cracked Crown in The Winter

Pennsylvanians know that winter weather can be harsh, especially for homes with a chimney. The heavy snowfall, icy conditions, and frigid temperatures can wreak havoc on the masonry, and one particularly vulnerable area is the crown. Therefore, homeowners should know the dangers of a cracked crown in winter.

What is a Chimney Crown, and What Does It Do?

So, what is a chimney crown? The crown is the concrete slab that seals the top of the chimney, surrounding the exposed flue pipe. When properly constructed, the crown’s surface slopes downward with a drip edge, allowing rain and melting snow to run off. 

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This design helps prevent water damage that can cause cracks in the crown’s surface. 

Why is a Cracked Crown Dangerous in the Winter?

When cracks develop in the crown, moisture seeps inside, potentially compromising the interior masonry walls and critical components, including the flue liner, smoke shelf, and damper. This can lead to a host of problems, from reduced efficiency and increased energy costs to the risk of a chimney fire. Also, the continuous freezing and thawing expands the cracks even further. So, in addition to water leaks, pests can also get inside the chimney.

Without immediate repair, the water damage can cause the bricks and mortar to decay, which could ultimately lead to a partial or complete collapse. Moisture intrusion also promotes the growth of mold and mildew, which can trigger an allergic reaction, an asthma attack, and respiratory issues in some individuals, especially in children and seniors. 

Common Reasons For Cracks In Crown

  • Damaged/Missing Chimney Cap: A chimney cap is like an umbrella; it helps keep the chimney’s top dry, providing additional moisture protection for the crown.
  • Seismic activity: Earthquakes create vibrations that cause the foundation to shift.  The sudden jolt and movement could cause cracks in the masonry and crown. Although quakes are infrequent in Pennsylvania, several significant events have occurred in Pittsburgh that have caused chimneys to collapse.
  • Snow and ice: The weight of snow and ice buildup can heavily stress the crown, potentially causing cracks. Water from melting snow can seep into the chimney, causing spalling, liner damage, and rust metal components.
  • Lightning: Lightning that strikes the crown can cause cracks or even fractures. Even worse, lightning could ignite creosote buildup, resulting in a structure fire. Several homes in Bucks County, PA, caught fire after lightning caused a neighboring chimney to explode. 
  • Improper construction: Improper construction or repair, such as using low-quality materials, can also leave the crown vulnerable to cracking.

Signs of a cracked crown

Does your chimney have a cracked crown? Here are some of the signs to watch for:

  • Water staining on the chimney or surrounding walls and ceiling near the fireplace or stove is often a tell-tale sign that your chimney crown may need repair. 
  • Visible cracks in the crown are the most obvious sign of damage, but it typically requires climbing on the roof to inspect it.
  • Efflorescence (white, powdery deposits) on the bricks is a sign that they absorb moisture, possibly due to crown damage from an inability to deflect rain or snow away from the chimney walls. 
  • Mold or mildew growth around the crown is another dangerous sign of moisture possibly seeping inside.

How Do You Repair a Cracked Crown?

Repairs for a cracked chimney crown depend on the severity of the damage and can range from a few hundred to several thousand dollars. It’s important to address these issues promptly to prevent further damage and more costly repairs. 

  1. CrownCoat sealant: We often repair minor cracks with a high-quality CrownCoat sealant, a specialized waterproofing product designed to seal and protect the crown from further water intrusion. 
  2. Crown rebuilding: For more significant damage, such as large cracks or extensive deterioration, rebuilding the crown may be necessary. It requires removing and re-constructing the damaged portion using a durable mortar compound, ensuring proper drainage and waterproofing.

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Is your chimney showing signs of a cracked crown? Cracks in the crown can be dangerous in the winter, so immediate repair is essential to prevent it from worsening. Don’t delay, contact Advance Chimney Sweeps for expert chimney inspection and repair in southwestern Pennsylvania. Our certified professionals serve the Greater Pittsburgh and Southern Alleghany Valley townships, including Allison Park, East Liberty, Irwin, and Natrona Heights. Schedule an appointment today