Parapet wall rebuilding in Chicago
A parapet is a low wall constructed above the roofline that usually spans around the perimeter of a building. Parapets may be purely aesthetic or primarily functional, such as hiding mechanical equipment or performing as a firewall.
The top of a parapet wall is vulnerable to moisture penetration problems. Choosing an appropriate cap is an effective way to eliminate this condition. A variety of materials are available to cap off the wall, with limestone, terra cotta, hard-fired clay, or precast concrete preferred. These materials have thermal properties similar to those of brick and concrete masonry.