What is the term for the distance between the top of one window and the bottom of the window above it?

The term for the distance between the top of one window and the bottom of the window above it is spandrel space. This area is significant in building construction as it often contains structural elements or can be utilized for architectural design features. In many buildings, spandrel spaces can also serve as a location for glare control or signage, depending on the window configuration and the design of the building's facade.

Understanding spandrel space is essential for recognizing how windows are aligned in relation to one another and how they contribute to a building’s overall aesthetic and functionality. This concept plays a role in fire service considerations too, such as heat transfer during a fire event or potential fire spread through openings.