Measuring Roof Pitch Angle

Pitch is the incline of the roof represented as the ratio of rise to the span twice the run.

Measuring roof pitch angle.

Roof pitch and corresponding angles. It always makes sense to the standard roof pitch angle spot on as the benefits of doing so are quite obvious. Now divide the rise by the multiplier to get the pitch eg. This measurement is best done on a bare roof because curled up roofing shingles will impair your measurement.

To convert between american roofing ratios and pitch degrees follow these steps. Find the inverse tangent of the pitch to find the angle in degrees. How to measure roof pitch to measure the roof pitch you ll need an 18 or 24 inch level a tape measure and a pencil. If you want to know how to find the pitch of a roof then start with a calculator.

Before taking any measurements you must first confirm that it s safe to walk on your roof. For example if the roof rises 4 feet and the span is 16 feet twice the run then the pitch is 4 16 or 1 4. Check the surface of the. Rafter height width from pythagoras remember that at school so.

A 12 12 pitch roof has a pitch angle of 45. The calculator above can handle much of this math. Take your pitch percent and press shift maybe 2nd function on your calculator then press tan and. The pitch of this roof is 4 8 12.

Position your level against the roof until the bubble of the vial sits between two lines. Since pitch is the rise over a 12 inch run divide the run by 12 to get the multiplier in this case 120 12 10. This means if a roof rises 4 in the length of 12 your roof pitch would be 4 12 or 18 43 degrees. Then in the attic place the end of the level against the bottom of a roof rafter and hold it perfectly level.

First measure 12 inches from one end of the level and make a mark. Take a measurement of 12 inches using a level. 48 10 4 8. Divide the first part of the ratio by 12 to work out the pitch.

With the help of these roof pitch degree calculator programs you can make sure that your home is nice and balanced. 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.