A roof with a slope of 3:12 indicates what relationship between lateral distance and vertical rise?

The statement that a roof has a slope of 3:12 indicates the ratio of vertical rise to horizontal run. This means that for every 12 inches of lateral (horizontal) distance traveled, there is a vertical rise of 3 inches. This ratio helps to describe the steepness of the roof and is critical for various applications in roofing, such as determining drainage, structural support, and aesthetic considerations.

Understanding this ratio is foundational for professionals who work with roofing, as it directly influences the design decisions and allows for effective communication regarding slope calculations and specifications. The correct option emphasizes this direct relationship between horizontal distance and vertical rise, which is essential knowledge in the roofing industry.