What is the term used to describe any structure above the roof-line?

The term that describes any structure above the roof line is often referred to as a penthouse. A penthouse typically serves as an upper-level feature, usually additional living space or utility areas, and it projects above the main roof line of the building. This distinction is important, especially in fire service operations, as it introduces specific access challenges and fire behavior considerations.

Other terms such as "attic" refer to spaces directly below the roof structure without projecting above it. "Parapet" is a barrier that extends above the roof line, usually for safety or architectural aesthetics, but does not constitute a separate structure on its own. A "canopy" generally describes a roof-like structure that is attached to a building, often for shelter, and does not usually refer to constructed space that extends above the height of the main building. Understanding these definitions helps in assessing building types and potential hazards in fire service operations.