How Do I Get The Pitch Of A Roof

Divide the slope by two to get the pitch.

How do i get the pitch of a roof.

For a roof with the ridge above one wall the span is the same as the run. This measurement is best done on a bare roof because curled up roofing shingles will impair your measurement. Divide the first part of the ratio by 12 to work out the pitch. For more complex roofs you may need to calculate it section by section.

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. A 12 12 pitch roof has a pitch angle of 45. 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.

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. Then in the attic place the end of the level against the bottom of a roof rafter and hold it perfectly level. Carpenters use special conversion charts to estimate the roofing material required based on the slope and shape. But again we are jumping ahead of ourselves.

First measure 12 inches from one end of the level and make a mark. To do this simply convert the rise and run as a fraction to a decimal form eg. Check your results with the omni roof pitch calculator. Here s an easy safe way to determine the pitch from inside your attic.

How to convert roof pitch to degrees. Before we get started with all that we need to find out the pitch of a roof. Rise run rise run slope. First convert the pitch to a slope.

The slope is the same as the pitch. To measure the roof pitch you ll need an 18 or 24 inch level a tape measure and a pencil.