So let s say a roof rises 6 inches for every 12 inches in depth towards the peak.
Roofing pitch factore.
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.
There are lots of advantages that you can get by having pitched roof on your house as compare to flat roof.
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.
For instance the ever last roofing company distributes a chart to the general public.
Pitched roof provide you protection again heavy rains.
Often you express roof pitch as the ratio between the rise and the run in the form of x 12.
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.
This means if a roof rises 4 in the length of 12 your roof pitch would be 4 12 or 18 43 degrees.
Roof pitch refers to the slope which the rafter creates.
One medium to describe the roof pitch is in 12 runs.
This numerical figure is significant as not everybody can understand the technical measurements.
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.
Simply locate a roof rafter board place the end of the level against the bottom edge and measure from the 12 inch mark vertically to the bottom edge of the rafter.
It is sometimes called the roof pitch multiplier.
For example if you measure 4 inches the pitch of your roof is 4 12.
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.
Charts list the slope factor for various pitches usually from 1 12 to 12 12.
The whole table of roof pitch and slope gives a conversion factor so as to obtain a numerical figure of the slope.
This will give you the rise over run or pitch.
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.
Flat and nearly flat roofs a pitch of 1 in 12 or 2 in 12 cannot be covered with shingles or shakes of any material since there is not enough angle to combat the danger of blow off.
The roof pitch would be described as a 6 12 pitch.
For example if the pitch of the roof is 6 then it is written as 6 12.
That is to say the roof pitch expressed as a ratio tells you how many inches the roof rises for every 12 inches of depth.
