Pitch Roof Slope Angle

This measurement is best done on a bare roof because curled up roofing shingles will impair your measurement.

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. To do this simply convert the rise and run as a fraction to a decimal form eg. 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. Roof pitch refers to the slope which the rafter creates. Rise run rise run slope. A 4 12 pitch is around 18 5 degrees but not exactly.

Roof pitch angle and slope factor charts. Roof pitch is a term describing how steep or flat your roof slope is. You can also divide the rise over run multiply by 100 and get a percentage. 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. The minimum roof pitch for shedding snow is around 30 or a 6 12 or 7 12 slope although this is not a definite as the material of your roof the direction of the snow and wind are some factors that can affect whether or not snow will slide as roofs of as little as 10 have been reported to shed snow. Thus a 4 12 pitch would be a 33 slope.