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.

In roof pitch calculator pitch value can be obtained by dividing n by 12 and divide s by the answer. 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. 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. A 3 in 12 roof rises 3 for every 12 of 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.

3 of rise per 12 of run is the same as 1 of rise per 4 of run or 1 4 25. 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. The horizontal change in distance or the horizontal distance covered by an un supported rafter or truss. That s the same as a 14 degree slope or a 25 slope.

The run is the distance from the outside of the wall to the inside of the ridge. 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. The rise is the distance from the top of the roof to the bottom.