What is the term used to describe the slope of the roof?

The term that describes the slope of the roof is "pitch." In roofing terminology, pitch refers to the steepness or angle of the roof surface. It is typically expressed as a ratio of the vertical rise to the horizontal run— for example, a pitch of 4:12 indicates that for every 12 horizontal units, the roof ascends 4 vertical units. Understanding the pitch is crucial as it influences water drainage, the choice of roofing materials, and design considerations.

The other terms may relate to aspects of geometry or construction but do not specifically define roof slope in the same context. Gradient usually pertains to the degree of incline of any surface, angle generally references the space between two intersecting lines or surfaces rather than being specific to rooftops, and rise, while it refers to the vertical component, does not encapsulate the broader concept of roof slope without its corresponding horizontal measurement.