What do you call the horizontal distance from the ridge to the wall in roof framing?

The horizontal distance from the ridge to the wall in roof framing is known as the run. This term specifically refers to the lateral distance that the roof extends horizontally from the peak (ridge) to the vertical rise point at the wall. Understanding the concept of "run" is crucial because it directly impacts other factors in roof framing, such as calculating roof pitch and slope.

In roof design, the run is essential for determining how far the roof will extend over the building and maintaining proper drainage. It's important to differentiate this from related terms: the rise pertains to the vertical height gained from the wall to the ridge, while the span denotes the total distance across from one side of the building to the other, which includes both the run and its mirrored counterpart. Lastly, the overhang refers to the portion of the roof that extends beyond the walls of the structure, providing additional protection and aesthetics, but does not describe the distance to the wall from the ridge.