What is the definition of a parapet wall?

A parapet wall is defined as a wall that extends above the roof line. This type of wall is commonly found on flat roofs, where it serves several purposes, including defining the edge of the roof, providing a barrier to prevent falls, and enhancing the overall aesthetics of the building.

Parapet walls can also help with fire protection by preventing the spread of flames from one roof to another, as well as offering some level of wind resistance. Their functionality becomes particularly important in urban environments where buildings are in close proximity to each other. By extending above the roof line, parapet walls effectively create a visual termination for the structure while serving practical safety and architectural functions.

Other definitions listed, such as a wall that supports a roof or a type of load-bearing wall, do not accurately describe the specific characteristics of a parapet wall. Additionally, the notion of a decorative wall found inside the building is not relevant to the function and placement of a parapet, which is specifically associated with the exterior.