Standard Roof Pitch Degrees

Making decision about roof pitch.

Standard roof pitch degrees.

Roof pitch is a measurement of a roof s slope expressed as a ratio. This measurement is best done on a bare roof because curled up roofing shingles will impair your measurement. However if you to do the process using your own knowledge you can still convert pitch to degrees by dividing the rise and run and get its corresponding measurement. The british standard for tilling and slating provides specific guidance about double lapped slating where calculations and recommendations for pitch and lap of slate are based on.

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. 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. Although there is no single standard roof pitch used on all sloped roofs factors such as roofing materials and local climate help to determine the appropriate range of pitches for a given building. The roof pitch is described by the vertical rise divided by horizontal span.

The value displayed as the rise will be your x. With the use of this converter it will be easier for you to locate a 30 degree roof pitch 20 degree roof pitch 25 degree roof pitch or a 15 degree roof pitch. Lower slopes don t handle wind driven rain as well. This part is well known as slope in geometry tangent function or stair construction in trigonometry.

The table below shows common roof pitches and the equivalent grade degrees and radians for each. The picture below shows the pitch of a 7 12 roof slope meaning that for 12 of horizontal measurement roof run the vertical measurement roof rise is 7. A 30 degree roof slope 7 12 pitch is the right pitch to aerodynamically handle high wind. Although there s isn t any standard pitch of a roof used on all kinds of sloped roofs you can determine the range of pitches by using a roof angle calculator and by considering factors like the local climate and roofing materials.

If you want to find the roof pitch in the form of x 12 simply calculate the pitch and substitute 12 for the run length. The 30 degree 7 12 roof recommendation is backed up by testing according to the publication science daily. The following table shows the roof pitch rise in run equivalents for all roof slopes in degrees from 1 to 72. This means if a roof rises 4 in the length of 12 your roof pitch would be 4 12 or 18 43 degrees.

A pitch over 9 12 is considered a steep slope roof between 2 12 and 4 12 is considered a low slope roof and less than 2 12 is considered a flat roof.