Get your roof size by using this roof pitch calculator.
Roof pitch percentage.
That s your roof pitch multiplier.
Low slope roofs are from 0 to 3 12 in pitch.
Roof pitch refers to the slope which the rafter creates.
For a 6 1 2 inch in 12 inch slope 6 1 2 6 5 arctan 6 5 divided by 12 arctan 0 54167 28 44 slope.
Often you express roof pitch as the ratio between the rise and the run in the form of x 12.
If asphalt shingles are to be installed on a low slope roof special steps are required to avoid short roof life and roof leaks.
Pitch rise run 1 5 6 25.
Sometimes pitch is also expressed in fraction form using a fraction with a slash such as 6 12.
The combination of two numbers are used to display or show the roof pitch.
Pitch is thus the ratio of the rise in inches to a 12 inch run and is often expressed using a semicolon for example 6 12.
A roof s pitch is determined by how much it rises vertically for every foot it runs horizontally.
See the image below for more explanation on rise run and pitch.
Recalculate this value into an angle.
This measurement is best done on a bare roof because curled up roofing shingles will impair your measurement.
Thus a moderate 6 in 12 roof pitch means that the roof rises 6 inches vertically for every 12 horizontal inches it runs.
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.
Calculate the roof pitch as the proportion of rise and run.
If you know the roof pitch in degrees find the secant of the slope using a scientific calculator.
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.
Two most common methods 4 12 or 4 12 are used for marking the pitch of a roof.
Enter the number 0 54167 in the following example and hit the atan button and then the button example.
Roof is 6 12 pitch and measures at 2 400 square feet so 2400 x 1 12 2 688 2 88 sqs added for pitch.
Divide the rise by the run and multiply by 100.
For help converting any slope from one way of expressing it to another see roof slope expressed as rise.
Finally you can find the roof pitch in the form of x 12.
For example if the roof pitch is 45 then sec 45 1 414213.
Angle arctan pitch arctan 0 25 14.
Some sources consider low slope to include 3 12 pitch roofs.
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 12 in 12 pitch is a steep 45 degree angle roof.
