Rise Over Run Roof

On a 38 degree sloping roof angle t each individual vertical rise of 9 4 y 1 would have a horizontal run x 1 of 12 inches.

Rise over run roof. In roof pitch calculator pitch value can be obtained by dividing n by 12 and divide s by the answer. Other than the 45 roof slope which is 12 in 12 none of the standard roof pitches 5 in 12 6 in 12 etc are equal to a whole degree. Why is the roof slope 25. For example if you measure 4 inches the pitch of your roof is 4 12.

The same pitch is also sometimes written as 4 12 4 in 12 or 4 over 12. Last updated july 10 2020 the following table shows the roof pitch rise in run equivalents for all roof slopes in degrees from 1 to 72. The rise is the distance from the top of the roof to the bottom. 3 of rise per 12 of run is the same as 1 of rise per 4 of run or 1 4 25.

The horizontal change in distance or the horizontal distance covered by an un supported rafter or truss. A 3 in 12 roof rises 3 for every 12 of run. Pitch is written assuming a run of a foot or 12 inches so the ratio describes how much the roof rises for every foot of its run. This will give you the rise over run or pitch.

Total roof rise or change in elevation for a 38 degree sloping roof angle t with one giant rise or step of 7 8 feet to the center of the attic y 2 would have total a run x 2 of 10 feet. For example a roof that rises 4 inches for every 12 inches of run has a 4 12 pitch. The run is the distance from the outside of the wall to the inside of the ridge.