Using A Roof Pitch Finder

The triangle shaped square was invented in 1925 by albert swanson to provide a quick accurate method for marking rafters.

Using a roof pitch finder.

Finding the pitch of a roof is simple with a speed square. Use the diagrams on this page as a reference when inputting rise and run and while interpreting the calculated results. Enter any pitch or fraction of pitch to find angle. Measure the rise of your roof.

But did you know that simple data already printed on your framing square can give key roof slope and rafter data. Most angle finders only work on the top side of a roof. Calculate the rafter length substituting these values into the following formula. This is our pitch calculator which will convert pitch to angle or angle to pitch for half degree roof slope calculations.

This handy little tool is the easiest way to accurately find your roof pitch. Before taking any measurements you must first confirm that it s safe to walk on your roof. No fooling around with tape measures and levels. The swanson speed square is a popular tool with most carpenters.

One method to find the pitch is to climb on the roof and measure the rise for a 12 run. Pitch rise run 1 5 6 25. Take the measurement of the vertical. The pitch is defined as the slope of the roof and is commonly represented as the ratio of the rise over the run in the form x 12.

The roof pitch calculator calculates slope pitch angle and rafter lengths based on input of rise m and run r. Calculate the roof pitch as the proportion of rise and run. Position your level against the roof until the bubble of the vial sits between two lines. The roof pitch is a measure of roof steepness.

You ll need a level that is 12 or longer and a tape measure. Take a measurement of 12 inches using a level. On the roof hold the level perfectly level and measure the height from the roof to the level 12 inches away from where the level touches the surface this will be the rise. Rafter rise run 1 5 6 2 25 36 38 25rafter 38 25 6 18 m.

Check the surface of the. The rise is the height of the roof at its highest point and the run is the horizontal span of the roof measured from the roof ridge to the side of the building. Simply set it on your roof or the underside of a rafter and read the gauge.