Roof Pitch Angle Table

For help converting any slope from one way of expressing it to another see roof slope expressed as rise.

Roof pitch angle table. You can assess this in two ways either as the roof pitch angles which the rafters make with the horizontal or the proportion between the run and the rise of the roof. Enter any pitch or fraction of pitch to find angle. If asphalt shingles are to be installed on a low slope roof special steps are required to avoid short roof life and roof leaks. Roof pitch degree table.

Roof online staff 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. Often you express roof pitch as the ratio between the rise and the run in the form of x 12. Roof pitch refers to the slope which the rafter creates. Notes to the table above.

A 12 12 pitch roof has a pitch angle of 45. Find the inverse tangent of the pitch to find the angle in degrees. Rise run rise run slope. Divide the first part of the ratio by 12 to work out the pitch.

Enter any angle or fraction of angle to find 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. To do this simply convert the rise and run as a fraction to a decimal form eg. Run degrees and percentage.

Usually they come in the form of a roof pitch diagram chart but other times it will be presented to you in a conversion format. Some sources consider low slope to include 3 12 pitch roofs. If you know the roof pitch in degrees find the secant of the slope using a scientific calculator. Two most common methods 4 12 or 4 12 are used for marking the pitch of a roof.

On blue prints architects engineers usually display the pitch of a roof in the format shown on the image where number 4 represents a rise and number 12 represents a length. This means if a roof rises 4 in the length of 12 your roof pitch would be 4 12 or 18 43 degrees. Use the diagrams on this page as a reference when inputting rise and run and while interpreting the calculated results. 45 this is our pitch calculator which will convert pitch to angle or angle to pitch for half degree roof slope calculations.

First convert the pitch to a slope. That s your roof pitch multiplier. To find the angle of a roof in degrees convert the pitch to a slope then convert to degrees by finding the arc tangent of the slope. In essence a roof pitch chart is provided as a rough guide usually by a roofing company to help you see what the average roof pitches tend to be.

For example if the roof pitch is 45 then sec 45 1 414213.