A 3/12 roof slope indicates what measurement?

A 3/12 roof slope indicates a specific ratio that reflects the rise over the run of the roof. In this case, it means that for every 12 inches of horizontal distance, the roof rises by 3 inches. This rise-to-run ratio is a standard way to express roof slopes and helps in determining the steepness of roofs. Understanding this measurement is crucial for planning drainage and ensuring that water does not accumulate on the roof surface.

This option accurately describes the slope, clearly outlining the rise per unit of horizontal length, which is essential for roofing design and construction. The other choices either suggest incorrect measurements or inversely state the slope, which would misrepresent the relationship between rise and run, leading to potential misunderstandings in construction practices.