What is the term for the top of a window or door frame?

The term for the top of a window or door frame is referred to as the "head." This terminology is standard in architecture and construction, where different components of frames have specific names. The head serves as the structural support at the top and plays a crucial role in distributing the weight above a window or door. It also helps define the overall assembly and stability of the opening.

In contrast, the "sill" refers to the bottom part of the window or door frame, providing support and drainage, while "jamb" denotes the vertical sides of the frame. The "header," which may seem similar, is often used to describe a beam above an opening but is not the correct term for the top frame itself. Understanding these definitions is essential for accurate communication and application within construction and fire inspection practices.