Find the inverse tangent of the pitch to find the angle in degrees.
How to tell the pitch of my roof.
Roof pitch refers to the slope which the rafter creates.
Place the end of your level the 0 inch point of your 12 marking against the roof surface.
First measure 12 inches from one end of the level and make a mark.
Pitch is a measure of the steepness of a roof.
Check your results with the omni roof pitch calculator.
You can t exactly get a ruler out to do it and guessing is just going to be suicidal in terms of the end product so if you are trying to learn how to determine roof pitch measurements you really do need to use a calculator.
The example to right shows 2 different ways to determine or calculate roof pitch also called roof slope.
A flat roof would have a 2 12 pitch while the average roof pitch would be between 4 12 and 9 12.
Often you express roof pitch as the ratio between the rise and the run in the form of x 12.
Simply mark a level at 12 hold it perfectly level and measure from the roof surface to your 12 mark this.
Here s an easy safe way to determine the pitch from inside your attic.
The term pitch has two different meanings when it comes to roofs.
It isn t necessarily a 12 inch run but the entire span.
Marvel at your mathematical.
Example a the measurements are taken from on top of the roof.
To convert between american roofing ratios and pitch degrees follow these steps.
If you are trying to learn how to measure roof pitch calculations accurately you should really consider the importance of using a calculator.
Finding roof pitch isn t rocket science it s simple geometry.
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.
A 12 12 pitch roof has a pitch angle of 45.
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.
Some carpenters consider it more correct to use the term slope for the steepness and use pitch to describe the roof s overall dimensions.
To measure the roof pitch you ll need an 18 or 24 inch level a tape measure and a pencil.
So if the roof has a 24 foot span and has a 4 foot rise then it has a 1 6 pitch.
Divide the first part of the ratio by 12 to work out the pitch.
This is the amount your roof inclines in a 1 foot span or the pitch of your roof.
So a roof that rises six inches for every foot of run has a 6 in 12 slope.
Then in the attic place the end of the level against the bottom of a roof rafter and hold it perfectly level.
Any pitch higher than 9 12 is considered a steep pitch.
Most people use it to mean the steepness of the roof.
Let us show you how to accurately determine roof pitch using simple tools level and measuring.
