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.
Roof pitch percentage.
If asphalt shingles are to be installed on a low slope roof special steps are required to avoid short roof life and roof leaks.
Low slope roofs are from 0 to 3 12 in pitch.
For example if the roof pitch is 45 then sec 45 1 414213.
Roof pitch refers to the slope which the rafter creates.
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.
The combination of two numbers are used to display or show the roof pitch.
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.
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.
Divide the rise by the run and multiply by 100.
Calculate the roof pitch as the proportion of rise and run.
For help converting any slope from one way of expressing it to another see roof slope expressed as rise.
Angle arctan pitch arctan 0 25 14.
Some sources consider low slope to include 3 12 pitch roofs.
This measurement is best done on a bare roof because curled up roofing shingles will impair your measurement.
Get your roof size by using this roof pitch calculator.
Rafter rise run 1 5 6 2 25 36 38 25rafter 38 25 6 18 m.
Finally you can find the roof pitch in the form of x 12.
Thus a moderate 6 in 12 roof pitch means that the roof rises 6 inches vertically for every 12 horizontal inches it runs.
Sometimes pitch is also expressed in fraction form using a fraction with a slash such as 6 12.
See the image below for more explanation on rise run and pitch.
A roof s pitch is determined by how much it rises vertically for every foot it runs horizontally.
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.
Pitch rise run 1 5 6 25.
That s your roof pitch multiplier.
Run degrees and percentage.
Recalculate this value into an angle.
Often you express roof pitch as the ratio between the rise and the run in the form of x 12.
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.
If you know the roof pitch in degrees find the secant of the slope using a scientific calculator.