Pitch Roof Slope Angle

Some sources consider low slope to include 3 12 pitch roofs.

Pitch roof slope angle.

To do this simply convert the rise and run as a fraction to a decimal form eg. A 12 12 pitch roof has a pitch angle of 45. To convert between american roofing ratios and pitch degrees follow these steps. 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. Roof pitch refers to the slope which the rafter creates. Two most common methods 4 12 or 4 12 are used for marking the pitch of a roof. Roof pitch angle and slope factor charts.

Low slope roofs are from 0 to 3 12 in pitch. A 4 12 pitch is around 18 5 degrees but not exactly. If asphalt shingles are to be installed on a low slope roof special steps are required to avoid short roof life and roof leaks. 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.

A ratio is the most common way of expressing roof pitch or roof slope but degrees are also possible. Divide the first part of the ratio by 12 to work out the pitch. 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. You can also divide the rise over run multiply by 100 and get a percentage.

This is very useful information for many purposes especially for roof framing the slope sometimes called pitch is calibrated on speed squares. See low slope roofing. Thus a 4 12 pitch would be a 33 slope. Roof pitch is a term describing how steep or flat your roof slope is.

This measurement is best done on a bare roof because curled up roofing shingles will impair your measurement. The combination of two numbers are used to display or show the roof pitch. First convert the pitch to a slope. 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.