What Is A Leaky Chimney?

Known for its three rivers and rich industrial history, Pittsburgh holds the title of the eighth-rainiest city in the U.S., with over 38 inches of precipitation each year. With all that rainfall, it’s no wonder that leaky chimneys are a prevalent issue. 

What Exactly Is a Leaky Chimney?

Simply put, a leaky chimney is when moisture enters the chimney system itself or, more concerningly, seeps into the interior of your home. To prevent leaks, the chimney cap and crown should shed rain and snow away from the chimney, siding, and roof. But when this system fails, your chimney can sprout a leak. A leaky chimney is a sign of potential problems that can lead to costly water damage if not repaired quickly. This can include structural damage to your home, mold, exposure to carbon monoxide fumes, and even fire hazards.

Signs Your Chimney Has a Leak

Detecting leaks early can save significant frustration and expense. Keep your senses in tune for these eight common indicators:

1. Water Stains: Discoloration or damp patches on walls or ceilings near the fireplace or stovepipe are classic signs of a leaky chimney.
2. Dripping Sounds: Hearing dripping water from the fireplace or chimney area, especially during or after rain, is another red flag.
3. Visible Water or Dampness: If you see moisture inside the firebox or damp spots on the exterior masonry, you’ve probably got a leak.
4. Musty or Moldy Odors: Lingering dampness often leads to mold or mildew growth, producing unpleasant, earthy smells near the fireplace.
5. Damaged Walls or Paint: Peeling paint or wallpaper near the chimney breast can indicate moisture seeping through the walls.
6. Liner Damage: Bits of clay or mortar in the fireplace are another sign of a leaky chimney.
7. Rusted Components: Rust on the damper assembly, firebox, or smoke shelf indicates prolonged exposure to moisture.
8. Spalling Masonry: Flaking, cracking, or chipping bricks or mortar joints suggest masonry damage from moisture absorption.

Why Is My Chimney Leaking?

When water damages the masonry, it can create one or more channels that wind through the weak points in your chimney system, like an internal river. Some of the components to check for a leaky chimney include:

• Missing or Damaged Chimney Cap: An absent or damaged chimney cap or cover allows rain and snow to fall directly down the flue, soaking the interior liner and potentially entering the home.
• Damaged Chimney Crown: The chimney crown is designed to shed water from the masonry. When cracks appear in the crown from exposure to moisture or another issue, it provides a direct entry point for precipitation to enter. It can damage the masonry walls and components like the liner and damper.
• Porous or Cracked Masonry: Bricks and mortar absorb water like sponges. Year after year, the freeze-thaw cycle constantly expands cracks, allowing more water to fill in the gaps in the masonry. In extreme cases, it can cause the chimney to lean or even topple over.
• Failed Flashing: The metal sheets sealing the seam where the chimney meets the roof are critical for keeping water at bay. Precipitation will leak through if the flashing is improperly installed, corroded, damaged, or sealed with the wrong type of caulking. This area is one of the most frequent sources of a leaky chimney.

How Can I Prevent Water Leaks In My Chimney:

• Make Minor Repairs Promptly: Don’t let small cracks or damaged joints worsen over time.
• Annual Inspections: Have a certified chimney professional inspect your chimney system every year. They can spot potential issues before they become major leaks.
• Replace the Chimney Cap/Chase Cover: Ensure the cap is secure and in good condition otherwise, have your chimney professional replace it.
• Check Flashing Regularly: Inspect flashing during routine roof maintenance or after severe weather.
• Waterproof Masonry: Consider having a chimney professional apply a vapor-permeable water repellent every few years, especially in wet climates like Pittsburgh.

Have a Leaky Chimney? We Can Fix It!

Advance Chimney Sweeps is Southwestern Pennsylvania’s most trusted chimney company, specializing in inspections, leak detection, repairs, chimney cleaning, and chimney cap installation. For all your fireplace, insert, and stove needs, contact Advance Chimney Sweeps today. Our certified professionals serve communities throughout Greater Pittsburgh, including Berlin, Graysville, Westmoreland City, and Kingwood WV. Visit our website at https://www.advancechimney.com/contact-us/ to schedule an appointment today! Ask about our convenient financing options.