Chimneys are, in essence, a big masonry wick, sitting on the roof, pointing to the sky. As such, chimneys are often “in trouble” from water intrusions. The most common entry point for moisture is the cap at the top. Improperly fabricated or misapplied caps allow water to enter at the top of the chimney which usually causes significant damage. Intricately detailed caps are more susceptible to leaks than the simple ones. As a member of the roof structure, various flashings are integral to the chimney construction and are another common source of water intrusion. Chimneys are also subject to high wind loads. Improperly constructed, the chimney “shakes in the wind”, causing cracks, which allows water penetration. Watch the following slideshows for examples.