Suffolk Concrete Contractors

Why Does My Brick Chimney Leak When It Rains?

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Is your chimney leaking every time it rains? Don’t wait for a small problem to become a major expense. From hidden cracks to weather woes, several factors can contribute to a leaky chimney. 

Best Brick Chimney Contractor in Suffolk, VA 

Phone: (757) 347-8090 

Email: info@suffolkmasonryva.com

Common Causes of Chimney Leaks

Several factors can contribute to a leaky chimney. Here are some of the most frequent causes we face in Suffolk:

1. Damaged Cap

The cap is the first line of defense against the elements. It prevents rain, snow, leaves, and animals from entering the flue. Over time, it can rust, sustain damage, or even blow off in strong winds, leaving the chimney exposed. This is the most common issue after storms in Suffolk. 

2. Cracked Mortar Joints

Mortar joints hold the bricks together but can deteriorate due to weathering, freeze-thaw cycles, and age. Cracks in the mortar allow water to penetrate the chimney, which can lead to leaks and potential structural issues.

Expert chimney services

3. Flashing Problems

Flashing is the metal sheeting that seals the gap between the flue and the roof to prevent water intrusion. Damaged, rusted, or improperly installed flashing is a frequent cause of leaks, often detected during our inspections.

4. Damaged or Missing Bricks

No doubt, bricks are durable, but they can develop cracks, spalling (surface flaking), or even fall out over time. Freeze-thaw cycles can worsen this issue, allowing water to seep in and cause further damage.

5. Porous Bricks

Older bricks can become porous, absorbing water like a sponge. When the water freezes and expands, it leads to further deterioration. This less obvious issue is often mitigated with specialized sealants.

6. Condensation

In some cases, especially with improperly sized or poorly ventilated chimneys, condensation can form inside the flue. This moisture can then enter into the brickwork and cause leaks.

Chimney Inspection, Detection, and Cleaning

How to Fix a Leaking Brick Chimney

1. Install or Replace the Cap

A properly installed cap is one of the most effective ways to prevent water from entering your chimney. It also helps keep out debris, animals, and downdraft.

2. Repair or Replace the Crown

If the crown is cracked or deteriorating, it should be repaired or replaced to prevent further water infiltration. A professional brick chimney contractor applies a specialized sealant or installs a new crown for added protection.

chimney crown

3. Repoint the Mortar Joints

Repointing involves removing damaged mortar and replacing it with fresh mortar to reinforce the structural integrity of your chimney. It prevents water from entering the flue and causing further deterioration.

4. Apply Waterproofing Sealant

Applying a high-quality waterproofing sealant to your flue can prevent water absorption. It creates a breathable barrier that keeps moisture out while allowing trapped water vapor to escape.

5. Repair or Replace Flashing

If your flashing is damaged or improperly installed, it should be repaired or replaced with a durable, weather-resistant material to prevent water from entering the roof area.

Preventing Chimney Leaks

To avoid costly repairs in the future, consider these preventive measures:

  • Schedule annual inspections.
  • Ensure the cap is intact and properly installed.
  • Keep the crown and mortar joints well-maintained.
  • Apply waterproofing sealant every few years.
  • Regularly check and maintain your roof flashing.

Looking for a Reliable Masonry Contractor in Suffolk?

Suffolk Masonry Contractor provides comprehensive services, from installation and repairs to tuckpointing, brick and stone replacement, and more. Their professionals are dedicated to protecting your home from the elements.  

Don’t wait until a small leak becomes a major problem. Call now to get a free quote.

Phone: (757) 347-8090

Email: info@suffolkmasonryva.com.

FAQs

1. How do I know if my chimney is leaking?

Signs include water stains on walls or ceilings, a musty odor, dampness near the fireplace, or visible cracks in the structure.

2. Can leaking chimneys cause health problems?

Yes, prolonged moisture exposure can lead to mold growth, which can cause respiratory issues, allergies, and other health concerns.

3. What type of bricks are best for chimneys in Suffolk?

Dense, high-quality bricks with low porosity are best for chimneys to minimize water absorption and handle Suffolk’s climate conditions.

4. What are the signs of a deteriorating flue liner? 

A deteriorating flue liner can cause several problems, including poor draft, carbon monoxide leaks, and fires. Signs of damage include cracked or missing liner tiles, crumbling mortar joints, and excessive creosote buildup.

5. How often should I have my chimney inspected?

It’s recommended to inspect it at least once a year to detect and address potential issues before they lead to costly repairs. Call (757) 347-8090 now for professional inspection.

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