For example if you measure 4 inches the pitch of your roof is 4 12.
Roofing pitch factore.
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.
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.
So let s say a roof rises 6 inches for every 12 inches in depth towards the peak.
The roof pitch would be described as a 6 12 pitch.
There are lots of advantages that you can get by having pitched roof on your house as compare to flat roof.
Pitched roof provide you protection again heavy rains.
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.
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.
It is sometimes called the roof pitch multiplier.
This means if a roof rises 4 in the length of 12 your roof pitch would be 4 12 or 18 43 degrees.
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.
For instance the ever last roofing company distributes a chart to the general public.
Roof pitch and corresponding angles.
Charts list the slope factor for various pitches usually from 1 12 to 12 12.
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.
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.
The whole table of roof pitch and slope gives a conversion factor so as to obtain a numerical figure of the slope.
For example if the pitch of the roof is 6 then it is written as 6 12.
This will give you the rise over run or pitch.
Often you express roof pitch as the ratio between the rise and the run in the form of x 12.
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.
Roof pitch refers to the slope which the rafter creates.
How roof pitch determines suitable roofing systems.
