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.
Roof pitch factors.
There are lots of advantages that you can get by having pitched roof on your house as compare to flat roof.
Low pitch roofs are safer and easier to access when maintenance.
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.
If a roof increases in height by four inches for every foot of horizontal run it is considered to have a 4 in 12 pitch or just a 4 pitch talk in terms of pitches and you will always be understood in the roofing universe.
Dividing the house width by two equals 14 feet.
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 suppose you have a 4 12 pitch roof and the width of the house is 28 feet.
Looking at the chart the factor is 1 0541.
This will give you the rise over run or pitch.
Especially for homes in the south a low pitch roof.
Multiply the result by the factor and this is the length of the roof from base to ridge.
This means if a roof rises 4 in the length of 12 your roof pitch would be 4 12 or 18 43 degrees.
Since a low pitch roof doesn t require as many shingles more often than not a low pitch roof will end up being more.
If you have already decided that you are going to have pitched roof on your house then you have made a nice decision.
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.
Roof pitch factor the roof pitch is a measure of roof steepness.
For example if you measure 4 inches the pitch of your roof is 4 12.
Roof pitch factor calculator.
This measurement is best done on a bare roof because curled up roofing shingles will impair your measurement.
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.
The lower pitch of the roof means greater walkability.
The leftover part is very simple as it simply involves mathematics.
In our example the roof pitch was calculated as 9 12 which has a factor of 1 25 in the table.
Roof pitch and corresponding angles.
The pitch is defined as the slope of the roof and is commonly represented as the ratio of the rise over the run in the form x 12.
