What do parapet walls do on flat roofs?

Parapet walls on flat roofs serve the purpose of extending above the roof line. These vertical extensions of a wall provide several important functions. One of the primary roles of parapet walls is to help prevent the spread of fire on a building, as they can contain flames and smoke within a designated area. Additionally, they offer protection against wind uplift and can help secure roof edge details, like drainage systems.

The design also impacts aesthetics, contributing to the overall look of the building by concealing rooftop equipment. This makes parapet walls a critical feature in roofing systems, especially for structures where fire safety regulations are a concern. Understanding this function is vital for firefighters and building safety inspectors, as parapet walls can influence fire behavior and tactics during firefighting operations.