Rise Over Run Roof

A 3 in 12 roof rises 3 for every 12 of run.

Rise over run roof.

In roof pitch calculator pitch value can be obtained by dividing n by 12 and divide s by the answer. That s the same as a 14 degree slope or a 25 slope. 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. 3 of rise per 12 of run is the same as 1 of rise per 4 of run or 1 4 25.

For example a roof that rises 4 inches for every 12 inches of run has a 4 12 pitch. 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. Why is the roof slope 25. Here is an online rise and run calculator which helps to calculate pitch slope and angle with the help of rise and run values.

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. The same pitch is also sometimes written as 4 12 4 in 12 or 4 over 12. 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.

The rise is the distance from the top of the roof to the bottom. The horizontal change in distance or the horizontal distance covered by an un supported rafter or truss. 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.