What is the top element of a masonry chimney called?

The top element of a masonry chimney is referred to as the crown. The crown serves several important functions; it protects the chimney from water damage, which can lead to deterioration of the masonry, and directs water away from the flue to mitigate the risk of moisture intrusion. The design of the crown typically includes a sloped surface that prevents water from pooling on top of the chimney.

In contrast, the term "cap" often refers to a protective cover placed on top of the chimney, which may include a screen to keep out animals and debris, but is generally not the structural element itself. The "flue" is the interior part of the chimney that allows smoke and gases to exit, and the "base" refers to the lower section of the chimney, supporting its structure. Understanding these terms and their functions is essential for recognizing the roles they play in chimney safety and longevity.