Roof Pitch Angle Table

Low slope roofs are from 0 to 3 12 in pitch.

Roof pitch angle table.

The roof pitch calculator calculates slope pitch angle and rafter lengths based on input of rise m and run r. 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. To convert between american roofing ratios and pitch degrees follow these steps. Roof pitch refers to the slope which the rafter creates.

A 12 12 pitch roof has a pitch angle of 45. Roof pitch degree table. 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.

45 this is our pitch calculator which will convert pitch to angle or angle to pitch for half degree roof slope calculations. 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. For example if the roof pitch is 45 then sec 45 1 414213. If you know the roof pitch in degrees find the secant of the slope using a scientific calculator.

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. That s your roof pitch multiplier. To do this simply convert the rise and run as a fraction to a decimal form eg. 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.

Some sources consider low slope to include 3 12 pitch roofs. Rise run rise run slope. Find the inverse tangent of the pitch to find the angle in degrees. Divide the first part of the ratio by 12 to work out the pitch.

First convert the pitch to a 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. 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.

Often you express roof pitch as the ratio between the rise and the run in the form of x 12. Two most common methods 4 12 or 4 12 are used for marking the pitch of a roof. Notes to the table above. If asphalt shingles are to be installed on a low slope roof special steps are required to avoid short roof life and roof leaks.

Enter any pitch or fraction of pitch to find angle.