How To Check The Pitch Of A Roof

Find the inverse tangent of the pitch to find the angle in degrees.

How to check the pitch of a roof.

Then in the attic place the end of the level against the bottom of a roof rafter and hold it perfectly level. First measure 12 inches from one end of the level and make a mark. 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.

The term pitch has two different meanings when it comes to roofs. Often you express roof pitch as the ratio between the rise and the run in the form of x 12. So if the roof has a 24 foot span and has a 4 foot rise then it has a 1 6 pitch. So a roof that rises six inches for every foot of run has a 6 in 12 slope.

Marvel at your mathematical. Most people use it to mean the steepness of the roof. The example to right shows 2 different ways to determine or calculate roof pitch also called roof slope. Divide the first part of the ratio by 12 to work out the pitch.

It isn t necessarily a 12 inch run but the entire span. Some carpenters consider it more correct to use the term slope for the steepness and use pitch to describe the roof s overall dimensions. Here s an easy safe way to determine the pitch from inside your attic. To convert between american roofing ratios and pitch degrees follow these steps.

Simply mark a level at 12 hold it perfectly level and measure from the roof surface to your 12 mark this. Roof pitch refers to the slope which the rafter creates. The 7 means that the roof rises 7 for every 12 it runs. Example a the measurements are taken from on top of the roof.

You can assess this in two ways either as the roof pitch angles which the rafters make with the horizontal or the proportion between the run and the rise of the roof. Check your results with the omni roof pitch calculator. Pitch is shown as a fraction which divides the rise by the span. To measure the roof pitch you ll need an 18 or 24 inch level a tape measure and a pencil.

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