The roof angle of incline is what primarily affects pitch. Homes are constructed using one of a common set of roof angles that are described in terms of the pitch. The 4/12 pitch is the standard roof found on most homes. It is not too steep and relatively easy for roofers to walk on.
To visualize pitch, imagine a ruler held exactly horizontally to the ground, placed over a roof. The length of the ruler is 12-inches, which is the run. The vertical distance between the open end of the ruler and the roof surface is the rise.Learn more about Baseball