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.

Two most common methods 4 12 or 4 12 are used for marking the pitch of a roof. You can also divide the rise over run multiply by 100 and get a percentage. Roof pitch refers to the slope which the rafter creates. See low slope roofing.

A 12 12 pitch roof has a pitch angle of 45. 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 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.

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. First convert the pitch to a slope.

The combination of two numbers are used to display or show the roof pitch. 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. Low slope roofs are from 0 to 3 12 in pitch. A ratio is the most common way of expressing roof pitch or roof slope but degrees are also possible.

Roof pitch angle and slope factor charts. A 4 12 pitch is around 18 5 degrees but not exactly. Rise run rise run slope. This is very useful information for many purposes especially for roof framing the slope sometimes called pitch is calibrated on speed squares.

If asphalt shingles are to be installed on a low slope roof special steps are required to avoid short roof life and roof leaks. To convert between american roofing ratios and pitch degrees follow these steps. To do this simply convert the rise and run as a fraction to a decimal form eg. Often you express roof pitch as the ratio between the rise and the run in the form of x 12.