Pitch Roof Slope Angle

Rise run rise run slope.

Pitch roof slope angle.

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. Thus a 4 12 pitch would be a 33 slope. Often you express roof pitch as the ratio between the rise and the run in the form of x 12.

Roof pitch is a term describing how steep or flat your roof slope is. A 4 12 pitch is around 18 5 degrees but not exactly. 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. 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.

First convert the pitch to a slope. The combination of two numbers are used to display or show the roof pitch. 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 angle and slope factor charts. Two most common methods 4 12 or 4 12 are used for marking the pitch of a roof. Roof pitch refers to the slope which the rafter creates.