Pitch Roof Slope Angle

Two most common methods 4 12 or 4 12 are used for marking the pitch of a roof.

Pitch roof slope angle.

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. If asphalt shingles are to be installed on a low slope roof special steps are required to avoid short roof life and roof leaks. This measurement is best done on a bare roof because curled up roofing shingles will impair your measurement. You can also divide the rise over run multiply by 100 and get a percentage.

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. To convert between american roofing ratios and pitch degrees follow these steps. Find the inverse tangent of the pitch to find the angle in degrees. A 4 12 pitch is around 18 5 degrees but not exactly.

Roof pitch angle and slope factor charts. The combination of two numbers are used to display or show the roof pitch. See low slope roofing. Roof pitch refers to the slope which the rafter creates.

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. Rise run rise run slope. Thus a 4 12 pitch would be a 33 slope. A ratio is the most common way of expressing roof pitch or roof slope but degrees are also possible.

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. Often you express roof pitch as the ratio between the rise and the run in the form of x 12. This is very useful information for many purposes especially for roof framing the slope sometimes called pitch is calibrated on speed squares. Divide the first part of the ratio by 12 to work out the pitch.

A 12 12 pitch roof has a pitch angle of 45. Some sources consider low slope to include 3 12 pitch roofs. 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. Roof pitch is a term describing how steep or flat your roof slope is.