Roof Pitch Percentage

For example if the roof pitch is 45 then sec 45 1 414213.

Roof pitch percentage.

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. Get your roof size by using this roof pitch calculator. Two most common methods 4 12 or 4 12 are used for marking the pitch of a roof. That s your roof pitch multiplier.

A roof s pitch is determined by how much it rises vertically for every foot it runs horizontally. Thus a moderate 6 in 12 roof pitch means that the roof rises 6 inches vertically for every 12 horizontal inches it runs. Angle arctan pitch arctan 0 25 14. Often you express roof pitch as the ratio between the rise and the run in the form of x 12.

Enter the number 0 54167 in the following example and hit the atan button and then the button example. Rafter rise run 1 5 6 2 25 36 38 25rafter 38 25 6 18 m. A 12 in 12 pitch is a steep 45 degree angle roof. If asphalt shingles are to be installed on a low slope roof special steps are required to avoid short roof life and roof leaks.

Divide the rise by the run and multiply by 100. Some sources consider low slope to include 3 12 pitch roofs. Finally you can find the roof pitch in the form of x 12. Recalculate this value into an angle.

This measurement is best done on a bare roof because curled up roofing shingles will impair your measurement. If you know the roof pitch in degrees find the secant of the slope using a scientific calculator. A roof with a 6 rise for every 12 run has a 6 per foot or 6 in 12 pitch. Low slope roofs are from 0 to 3 12 in pitch.

The combination of two numbers are used to display or show the roof pitch. 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. Run degrees and percentage. See the image below for more explanation on rise run and pitch.

Calculate the roof pitch as the proportion of rise and run. 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. Sometimes pitch is also expressed in fraction form using a fraction with a slash such as 6 12. Roof pitch refers to the slope which the rafter creates.

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. For help converting any slope from one way of expressing it to another see roof slope expressed as rise.