Roofing Pitch Factor

In order to know what type of materials will work best for your project and the amount of materials required you ll need to find out the pitch of your roof.

Roofing pitch factor.

Thus a moderate 6 in 12 roof pitch means that the roof rises 6 inches vertically for every 12 horizontal inches it runs. Pitch is expressed as a ratio of the vertical rise to the horizontal span. Roof pitch refers to the slope which the rafter creates. Often you express roof pitch as the ratio between the rise and the run in the form of x 12.

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 and corresponding angles. Calculate the rafter length substituting these values into the following formula. There are lots of advantages that you can get by having pitched roof on your house as compare to flat roof.

A 12 in 12 pitch is a steep 45 degree angle roof. A roof s pitch is determined by how much it rises vertically for every foot it runs horizontally. This means if a roof rises 4 in the length of 12 your roof pitch would be 4 12 or 18 43 degrees. This numerical figure is significant as not everybody can understand the technical measurements.

Let s say it is equal to 1 5 m. 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. One medium to describe the roof pitch is in 12 runs. Roof pitch factor calculator if you have already decided that you are going to have pitched roof on your house then you have made a nice decision.

Factor charts you could calculate the slope factor for every single roof pitch but as a public service many roofing companies provide slope factor charts. Therefore your slope factor for a 6 12 pitch roof is 1 118. 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. 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.

For example if the pitch of the roof is 6 then it is written as 6 12. Pitch rise run 1 5 6 25. The whole table of roof pitch and slope gives a conversion factor so as to obtain a numerical figure of the slope. The roof pitch conversion factor is a number that when multiplied by the area covered by the roof gives an estimate the total surface area of the sloped roof itself.

Calculate the roof pitch as the proportion of rise and run. See the image below for more explanation on rise run and pitch. Pitched roof provide you protection again heavy rains. It is sometimes called the roof pitch multiplier.