Pitch Roof Slope Angle

Roof pitch is a term describing how steep or flat your roof slope is.

Pitch roof slope angle.

First convert the pitch to a slope. The combination of two numbers are used to display or show the roof pitch. Roof pitch refers to the slope which the rafter creates. 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.

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. This measurement is best done on a bare roof because curled up roofing shingles will impair your measurement. A 4 12 pitch is around 18 5 degrees but not exactly. A ratio is the most common way of expressing roof pitch or roof slope but degrees are also possible.

Thus a 4 12 pitch would be a 33 slope. 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. Rise run rise run slope. Two most common methods 4 12 or 4 12 are used for marking the pitch of a roof.

Often you express roof pitch as the ratio between the rise and the run in the form of x 12. 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 do this simply convert the rise and run as a fraction to a decimal form eg.