Roof Pitch Slope Factor Chart

Common roof pitches and equivalent grade degree and radian angles.

Roof pitch slope factor chart.

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. Two most common methods 4 12 or 4 12 are used for marking the pitch of a roof. 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. Most roof s have a pitch in the 4 12 to 9 12 range.

Outside of the u s a degree angle is typically used. The maths behind this number is that it is the square root of rise run 2 1. 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. The roof slope factor chart also consists of conversion factors to determine the slope of the roof.

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. This measurement is best done on a bare roof because curled up roofing shingles will impair your measurement. The headache of using pythagoras and trigonometry can be spared by making use of these charts. 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 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. Roof pitch refers to the slope which the rafter creates. Roof pitch angle and slope factor charts roof pitch is a term describing how steep or flat your roof slope is. For instance a 7 12 roof pitch means that the roof rises 7 inches for every 12 horizontal inches.

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. 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. The combination of two numbers are used to display or show the roof pitch. 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.

It is often compared to slope but is not exactly the same. 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.