Why does my chimney leak?

Chimney leaks are often a result of multiple factors working together. Weathered mortar joints, a damaged chimney crown, compromised flashing, and porous masonry materials can contribute to water infiltration. 

The most common culprit is deteriorated mortar joints. Over time, weather conditions and exposure to moisture can cause the mortar between the bricks or stones of your chimney to weaken and crumble, allowing water to seep in.

Another reason for chimney leaks is a damaged chimney crown. The chimney crown is the top part of the chimney that covers the masonry. If it cracks or deteriorates, water can penetrate and lead to leaks. Flashing, the metal sheeting that seals the joint between the chimney and the roof, is also prone to causing leaks when it becomes damaged or improperly installed.

Additionally, porous bricks or stones can absorb water, which then seeps into the interior of the chimney. Poor chimney cap maintenance, missing chimney caps, and faulty chimney liners can further exacerbate the issue. In many cases, a professional chimney inspection can help pinpoint the exact cause of the leak and guide you toward effective solutions.

Understanding that a chimney leak is the result of a combination of factors is key to addressing the issue comprehensively. Regular maintenance, including repairing mortar joints, maintaining the chimney crown, and ensuring proper flashing and chimney cap installation, can help keep your chimney watertight and your home safe from leaks.