Pitch Roof Slope Angle

You can also divide the rise over run multiply by 100 and get a percentage.

Pitch roof slope angle.

Low slope roofs are from 0 to 3 12 in pitch. Rise run rise run slope. Some sources consider low slope to include 3 12 pitch roofs. Thus a 4 12 pitch would be a 33 slope.

Divide the first part of the ratio by 12 to work out the pitch. 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. If asphalt shingles are to be installed on a low slope roof special steps are required to avoid short roof life and roof leaks. Find the inverse tangent of the pitch to find the angle in degrees.

Angle the angle of a roof is the same as the roof s slope except instead of being represented as x 12 it is represented in degrees. Roof pitch refers to the slope which the rafter creates. 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. This is very useful information for many purposes especially for roof framing the slope sometimes called pitch is calibrated on speed squares.

To do this simply convert the rise and run as a fraction to a decimal form eg. To convert between american roofing ratios and pitch degrees follow these steps. Roof pitch is a term describing how steep or flat your roof slope is. First convert the pitch to a slope.

See low slope roofing. A 4 12 pitch is around 18 5 degrees but not exactly. This measurement is best done on a bare roof because curled up roofing shingles will impair your measurement. Roof pitch angle and slope factor charts.

Often you express roof pitch as the ratio between the rise and the run in the form of x 12. A 12 12 pitch roof has a pitch angle of 45. 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. 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.