How Do I Get The Pitch Of A Roof

This measurement is best done on a bare roof because curled up roofing shingles will impair your measurement.

How do i get the pitch of a roof.

To convert between american roofing ratios and pitch degrees follow these steps. For a roof with the ridge above one wall the span is the same as the run. To measure the roof pitch you ll need an 18 or 24 inch level a tape measure and a pencil. Marvel at your mathematical.

The slope is the same as the pitch. Divide the slope by two to get the pitch. Rise run rise run slope. To do this simply convert the rise and run as a fraction to a decimal form eg.

First convert the pitch to a slope. The roof pitch is necessary for two things one estimating the amount of material to be ordered for the job and two knowing what materials are suited for the roof. But again we are jumping ahead of ourselves. Divide the first part of the ratio by 12 to work out the pitch.

First measure 12 inches from one end of the level and make a mark. To find the angle of a roof in degrees convert the pitch to a slope then convert to degrees by finding the arc tangent of the slope. How to convert roof pitch to degrees. What is a 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. Find the inverse tangent of the pitch to find the angle in degrees. For more complex roofs you may need to calculate it section by section. Carpenters use special conversion charts to estimate the roofing material required based on the slope and shape.

Check your results with the omni roof pitch calculator. Then in the attic place the end of the level against the bottom of a roof rafter and hold it perfectly level.