Formula For Finding Pitch Of A Roof

Measure from the roof.

Formula for finding pitch of a roof.

Once you have your roof s pitch divide the number by 12. If you add an eaves overhang dimension then the amount the rafter sticks passed the wall will be added to the rafter length. For example if your roof s pitch is 4 in 12 you would divide 4 by 12. Then in the attic place the end of the level against the bottom of a roof rafter and hold it perfectly level.

Slope the slope of a roof is represented as x 12 where x is the number of inches in rise for every 12 inches of run this is very useful information for many purposes especially for roof framing the slope sometimes called pitch is calibrated on speed squares. You ll need a level that is 12 or longer. Visually where and what values can be seen in the drawing of the calculator which is under the form of calculation. The roof pitch calculator is a convenient online tool you can use to quickly assess the pitch of your roof to determine the length of rafters you need.

Image 1 12 to 12 12 roof pitch 7 12 pitch. Calculate the length of a rafter from the roof slope ratio of inches per foot and a building width measurement. However if you have a more complex roof you may need to calculate pitch section by section. Roof pitch angle calculator briefly about the calculation.

See the chart below for some examples of common roof pitches. A 12 12 pitch roof has a pitch angle of 45. For more on calculating roof pitch and understanding how pitch and slope are different read on. To measure the roof pitch you ll need an 18 or 24 inch level a tape measure and a pencil.

Marvel at your mathematical. Angle the angle of a roof is the same as the roof s slope except instead of being. This would yield 1 3 next square your result. To convert between american roofing ratios and pitch degrees follow these steps.

Roof pitch degree table. After finding out your roof pitch angles you can use the calculator to perform the calculations for you instead of doing them manually. Find the inverse tangent of the pitch to find the angle in degrees. Check your results with the omni roof pitch calculator.

Includes result for hip valley factor slope factor and the roof slope in degrees. First measure 12 inches from one end of the level and make a mark. Divide the first part of the ratio by 12 to work out the pitch. Roof pitch calculator results explained.

After measuring the slope estimate the roof pitch by dividing the slope by 2 if you have a simple gable roof. One method to find the pitch is to climb on the roof and measure the rise for a 12 run. The roof pitch angle calculator is used to calculate both the roof slope angle and the missing roof data the projection height length and slope angle of the roof.