What is the definition of slope in roofing terminology?

In roofing terminology, slope is defined as the rise of the roof divided by the run. This measurement is essential in understanding how steep or flat a roof is, which influences water drainage, roofing material selection, and overall roof design.

The 'rise' refers to the vertical height of the roof from its lowest to its highest point, while the 'run' is the horizontal distance over which the rise occurs. By dividing the rise by the run, you determine a ratio that indicates the steepness of the roof. This ratio can also be expressed as a percentage or in degrees, which helps builders, architects, and engineers make decisions regarding structural integrity and water shedding capability.

Understanding the slope is critical because it impacts not only the functionality of the roofing system but also the aesthetic aspects of the structure. Proper slope helps ensure that water drains off efficiently, reducing the risk of leaks and long-term damage to the roof and the building itself.