Pitch Roof Slope Angle

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.

Pitch roof slope angle.

To convert between american roofing ratios and pitch degrees follow these steps. Two most common methods 4 12 or 4 12 are used for marking the pitch of a roof. A ratio is the most common way of expressing roof pitch or roof slope but degrees are also possible. To do this simply convert the rise and run as a fraction to a decimal form eg.

Thus a 4 12 pitch would be a 33 slope. 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. If asphalt shingles are to be installed on a low slope roof special steps are required to avoid short roof life and roof leaks. Rise run rise run slope.

Divide the first part of the ratio by 12 to work out the pitch. First convert the pitch to a slope. See low slope roofing. Roof pitch angle and slope factor charts.

Find the inverse tangent of the pitch to find the angle in degrees. This is very useful information for many purposes especially for roof framing the slope sometimes called pitch is calibrated on speed squares. The combination of two numbers are used to display or show the roof pitch. 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.

A 12 12 pitch roof has a pitch angle of 45. This measurement is best done on a bare roof because curled up roofing shingles will impair your measurement. 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. Roof pitch refers to the slope which the rafter creates.

You can also divide the rise over run multiply by 100 and get a percentage. Some sources consider low slope to include 3 12 pitch roofs. 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. Low slope roofs are from 0 to 3 12 in pitch.