Roof Pitch Percentage

Some sources consider low slope to include 3 12 pitch roofs.

Roof pitch percentage.

Angle arctan pitch arctan 0 25 14. 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. 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.

If asphalt shingles are to be installed on a low slope roof special steps are required to avoid short roof life and roof leaks. Get your roof size by using this roof pitch 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. Enter the number 0 54167 in the following example and hit the atan button and then the button example.

A roof with a 6 rise for every 12 run has a 6 per foot or 6 in 12 pitch. Roof pitch refers to the slope which the rafter creates. Thus a moderate 6 in 12 roof pitch means that the roof rises 6 inches vertically for every 12 horizontal inches it runs. Rafter rise run 1 5 6 2 25 36 38 25rafter 38 25 6 18 m.

That s your roof pitch multiplier. For example if the roof pitch is 45 then sec 45 1 414213. Divide the rise by the run and multiply by 100. 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.

Pitch rise run 1 5 6 25. 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. Often you express roof pitch as the ratio between the rise and the run in the form of x 12. If you know the roof pitch in degrees find the secant of the slope using a scientific calculator.

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. Recalculate this value into an angle. For help converting any slope from one way of expressing it to another see roof slope expressed as rise. Low slope roofs are from 0 to 3 12 in pitch.

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. A 12 in 12 pitch is a steep 45 degree angle roof. This measurement is best done on a bare roof because curled up roofing shingles will impair your measurement.

Run degrees and percentage. Finally you can find the roof pitch in the form of x 12.