A freestanding wall that extends above the roofline is referred to as what?

A freestanding wall that extends above the roofline is referred to as a parapet. This architectural feature serves several important functions. Primarily, parapets help to prevent water from flowing over the edge of the roof, protecting the underlying structure from potential water damage. They also enhance the safety of the roof area by acting as a barrier, reducing the risk of falls from the edge. Additionally, parapets can be important for aesthetic purposes and can lend character to a building's design.

In fire protection terms, parapets can play a crucial role in mitigating fire spread, particularly at the edges of rooftops. By limiting the exposure of combustible materials and providing a barrier that can slow the progress of flames, parapets contribute to fire safety measures in building designs.