Rise Over Run Roof

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.

Rise over run roof.

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. That s the same as a 14 degree slope or a 25 slope. For example a roof that rises 4 inches for every 12 inches of run has a 4 12 pitch. 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.

Here is an online rise and run calculator which helps to calculate pitch slope and angle with the help of rise and run values. 3 of rise per 12 of run is the same as 1 of rise per 4 of run or 1 4 25. The same pitch is also sometimes written as 4 12 4 in 12 or 4 over 12. Simply locate a roof rafter board place the end of the level against the bottom edge and measure from the 12 inch mark vertically to the bottom edge of the rafter.

A 3 in 12 roof rises 3 for every 12 of 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 if you measure 4 inches the pitch of your roof is 4 12.

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. In roof pitch calculator pitch value can be obtained by dividing n by 12 and divide s by the answer. Why is the roof slope 25.