If you want to find the roof pitch in the form of x 12 simply calculate the pitch and substitute 12 for the run length.
Pitch my roof.
Take a measurement of 12 inches using a level.
One method to find the pitch is to climb on the roof and measure the rise for a 12.
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.
The value displayed as the rise will be your x.
Pitch tan angle where angle is the roof pitch expressed in degrees.
Another method to find the roof pitch is to go into the attic and measure the rise.
How to calculate the pitch of a roof method one.
Measure from the attic.
Before taking any measurements you must first confirm that it s safe to walk on your roof.
Take the measurement of the vertical.
How to measure roof pitch to measure the roof pitch you ll need an 18 or 24 inch level a tape measure and a pencil.