When the structure is what is failing, such as extensive damage, instability, or deterioration that patching will not hold. Small, contained damage is usually a repair.
It means the part of the chimney above the roof was rebuilt, while the portion below the roofline was left in place.
An inspection will show how far the damage extends. TopDog Chimney offers free estimates and will explain your options in writing.
The crown is the top surface of the chimney. When it cracks, rain and snowmelt run straight into the masonry, where the water freezes, expands, and breaks the brick from within. That is why a cracked crown is often where larger chimney damage starts.
A cap covers the top of the flue to keep out rain, animals, and debris. Without one, the flue is an open hole into the home: water can run down it, animals can nest in it, and embers can escape onto the roof.