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. 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. The same pitch is also sometimes written as 4 12 4 in 12 or 4 over 12. The run is the distance from the outside of the wall to the inside of the ridge.

That s the same as a 14 degree slope or a 25 slope. 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. Here is an online rise and run calculator which helps to calculate pitch slope and angle with the help of rise and run values. 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. The horizontal change in distance or the horizontal distance covered by an un supported rafter or truss. For example if you measure 4 inches the pitch of your roof is 4 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.

Why is the roof slope 25. This will give you the rise over run or pitch. The rise is the distance from the top of the roof to the bottom.