Roof pitch refers to the slope which the rafter creates.
How to tell the pitch of my roof.
A flat roof would have a 2 12 pitch while the average roof pitch would be between 4 12 and 9 12.
Here s an easy safe way to determine the pitch from inside your attic.
Find the inverse tangent of the pitch to find the angle in degrees.
The pitch of the roof is determined by the vertical rise in inches for every horizontal twelve inch length.
Marvel at your mathematical.
So a roof that rises six inches for every foot of run has a 6 in 12 slope.
Let us show you how to accurately determine roof pitch using simple tools level and measuring.
The example to right shows 2 different ways to determine or calculate roof pitch also called roof slope.
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.
Some carpenters consider it more correct to use the term slope for the steepness and use pitch to describe the roof s overall dimensions.
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.
Simply mark a level at 12 hold it perfectly level and measure from the roof surface to your 12 mark this.
It isn t necessarily a 12 inch run but the entire span.
Pitch is a measure of the steepness 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.
The term pitch has two different meanings when it comes to roofs.
Most people use it to mean the steepness of the roof.
If you are trying to learn how to measure roof pitch calculations accurately you should really consider the importance of using a calculator.
Often you express roof pitch as the ratio between the rise and the run in the form of x 12.
To convert between american roofing ratios and pitch degrees follow these steps.
Pitch is shown as a fraction which divides the rise by the span.
Place the end of your level the 0 inch point of your 12 marking against the roof surface.
Any pitch higher than 9 12 is considered a steep pitch.
So if the roof has a 24 foot span and has a 4 foot rise then it has a 1 6 pitch.
This is the amount your roof inclines in a 1 foot span or the pitch of your roof.
Check your results with the omni roof pitch calculator.
First measure 12 inches from one end of the level and make a mark.
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.
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.
