Roof Pitch Slope Factor Chart

Common roof pitches and equivalent grade degree and radian angles.

Roof pitch slope factor chart.

A pitch over 9 12 is considered a steep slope roof between 2 12 and 4 12 is considered a low slope roof and less than 2 12 is considered a flat roof. Outside of the u s a degree angle is typically used. A 10 slope roof should not be confused with a 10 pitch roof as a 10 slope roof means that the roof rises by ten inches for every foot of run. 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. 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. Most roof s have a pitch in the 4 12 to 9 12 range. 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.

Slope factor chart know your pitch when outfitting your residential or commercial structure with roofing materials from everlast roofing inc it s important to know the incline or pitch of your roof. Often you express roof pitch as the ratio between the rise and the run in the form of x 12. Learn more about finding the angle of a line using our slope calculator. A roof pitch multiplier also known as a roof pitch factor is a number that when multiplied by the area covered by a sloped roof gives the actual area of the roof.

Usually they come in the form of a roof pitch diagram chart but other times it will be presented to you in a conversion format. Roof pitch angle and slope factor charts roof pitch is a term describing how steep or flat your roof slope is. It is often compared to slope but is not exactly the same. In essence a roof pitch chart is provided as a rough guide usually by a roofing company to help you see what the average roof pitches tend to be.

In the united states a run of 12 inches 1 foot is used and pitch is measured as the rise of the roof over 12 inches. A roof pitch multiplier also called a roof pitch factor is a number that is multiplied by the area covered by a sloped roof to produce the area of the actual surface of the roof. For instance a 7 12 roof pitch means that the roof rises 7 inches for every 12 horizontal inches. The maths behind this number is that it is the square root of rise run 2 1.

For roof slopes expressed as x in 12 rise in run the roof pitch multiplier is determined by finding the square root of rise run 1. This measurement is best done on a bare roof because curled up roofing shingles will impair your measurement.