Another method to find the roof pitch is to go into the attic and measure the rise.
Pitch my roof.
Before taking any measurements you must first confirm that it s safe to walk on your roof.
Pitch tan angle where angle is the roof pitch expressed in degrees.
How to calculate the pitch of a roof method one.
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.
Measure from the roof.
First measure 12 inches from one end of the level and make a mark.
Take a measurement of 12 inches using a level.
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.
Take the measurement of the vertical.
Then in the attic place the end of the level against the bottom of a roof rafter and hold it perfectly level.
The value displayed as the rise will be your x.
Position your level against the roof until the bubble of the vial sits between two lines.