What is a Chimney Crown?
A chimney crown is a solid masonry surface that covers the top of the chimney walls.
The purpose is to act as a barrier for moisture between the outside and the masonry chimney. This is not the same as the chimney cap . A cap covers the flue or pipe opening.
The crown prevents water from seeping into the masonry walls. These crowns are also typically built to with a slight pitch away from the center to prevent water from puddling and allow it to drip harmlessly away from the chimney.
Leaking Chimney Crown
When a crown is cracked or crumbling, this can be problematic for both the chimney and the house below. Water seeps in through the cracks and can result in water marks on the ceiling or a drip in front of the fireplace. Water damage to the interior of the chimney is likely .
The deterioration of a chimney crown takes place with extreme weather conditions in our area. Once cracks begin, they are further provoked by the freeze/thaw cycles that will cause them to expand and get deeper and wider as the process continues. Once the crack is all the way through, the water can cause damage within the chimney and to the ceiling around the fireplace.
If left unchecked, a deteriorated crown can be an attractive place for critters to take up residence!
