Roof Slope Degree

It s just a little math.

Roof slope degree.

Also see our page quick reference. This means that the rise of the slope goes up or down 8 inches for every 12 inches. Sangle tan 1 1 m 2 m 26 6. Either way let s see how you can calculate the slope of a roof without using a roof slope calculator.

Slope as angle for an elevation of 1 m over a distance of 2 m can be calculated as. 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. The 45 degree roofs seen on a frame houses are 12 in 12 but roofs can be even steeper consider the mansard roofs introduced by french second empire architects in the middle of the 1800s. Measuring the slope from the rafters.

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. See below after the table for directions on how to convert any roof slope from one form to another even roof slopes not shown in the table. Last updated july 10 2020. Roof slope expressed as rise.

The following table shows the roof pitch rise in run equivalents for all roof slopes in degrees from 1 to 72. Example slope as angle. An example for a steep sloped roof is 8 12. Pitched roofs begin with with slopes greater than 3 in 12.

The most precise way to find the roof s slope is by measuring it from the underside. Roof pitch is a measurement of a roof s slope expressed as a ratio. These are utilized in residential applications. To put it in perspective the angle of this slope would be around 30 degrees.

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. Some of the most common roof pitch types are conventional slope type roofs designed with pitch ranging from 4 12 to 9 12. Most roof s have a pitch in the 4 12 to 9 12 range. The table below shows common roof pitches and the equivalent grade degrees and radians for each.

Access one of the rafters then take the measurement this way. 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. Mansard roofs with nearly vertical faces can boast a pitch of 20 in 12. This measurement is best done on a bare roof because curled up roofing shingles will impair your measurement.

To see what the degree equivalents are for standard rise in run roof pitches see our page quick reference. Roof pitches exceeding the level of 9 12 or approximately 37 degrees are termed steep slope roofs.