How To Determine The Pitch Of Your Roof

Divide the first part of the ratio by 12 to work out the pitch.

How to determine the pitch of your roof.

Marvel at your mathematical. Knowing the pitch of your roof is useful when designing an addition installing skylights or cutting new rake boards. To measure the roof pitch you ll need an 18 or 24 inch level a tape measure and a pencil. Climb up on your roof.

Check your results with the omni roof pitch calculator. How to measure roof pitch. Here s an easy safe way to determine the pitch from inside your attic. Place the end of your level the 0 inch point of your 12 marking against the roof surface.

Find the inverse tangent of the pitch to find the angle in degrees. This is the amount your roof inclines in a 1 foot span or the pitch. If you can t get to your attic you can measure slope on your rooftop as long as it s safe to go up there. Before you calculate roof pitch you ll need to measure the slope of your roof.

To convert between american roofing ratios and pitch degrees follow these steps. After measuring the slope estimate the roof pitch by dividing the slope by 2. Hold the level straight and level bubble centered and then measure the vertical distance down from the your 12 mark on the level down to the roof. A 12 12 pitch roof has a pitch angle of 45.