How Do I Get The Pitch Of A Roof

Carpenters use special conversion charts to estimate the roofing material required based on the slope and shape.

How do i get the pitch of a roof.

But again we are jumping ahead of ourselves. 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. First measure 12 inches from one end of the level and make a mark. This measurement is best done on a bare roof because curled up roofing shingles will impair your measurement.

Divide the slope by two to get the 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. The slope is the same as the pitch. Here s an easy safe way to determine the pitch from inside your attic.

For more complex roofs you may need to calculate it section by section. A 12 12 pitch roof has a pitch angle of 45. Then in the attic place the end of the level against the bottom of a roof rafter and hold it perfectly level. Find the inverse tangent of the pitch to find the angle in degrees.

Rise run rise run slope. How to convert roof pitch to degrees. Check your results with the omni roof pitch calculator. Divide the first part of the ratio by 12 to work out the pitch.

First convert the pitch to a slope. 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. What is a roof pitch.

To do this simply convert the rise and run as a fraction to a decimal form eg. Before we get started with all that we need to find out the pitch of a roof.