Standard Roof Pitch In Degrees

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.

Standard roof pitch in degrees.

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 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. Pitch tan angle where angle is the roof pitch expressed in degrees. This means if a roof rises 4 in the length of 12 your roof pitch would be 4 12 or 18 43 degrees.

Roof pitch is a measurement of a roof s slope expressed as a ratio. Making decision about roof 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 30 degree 7 12 roof recommendation is backed up by testing according to the publication science daily.

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. A 30 degree roof slope 7 12 pitch is the right pitch to aerodynamically handle high wind. The roof pitch is described by the vertical rise divided by horizontal span. Roof pitch refers to the measurement of the slope of a roof and you express this as a ratio.

This part is well known as slope in geometry tangent function or stair construction in trigonometry. The value displayed as the rise will be your x. This measurement is best done on a bare roof because curled up roofing shingles will impair your measurement. The following table shows the roof pitch rise in run equivalents for all roof slopes in degrees from 1 to 72.

The table below shows common roof pitches and the equivalent grade degrees and radians for each. Lower slopes don t handle wind driven rain as well. Steeper slopes increase the sail effect that makes them susceptible to wind. 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.

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.