Proper construction of the roof provides waterproofing and wind resistance. Position a level against the underside of the rafter. For example if you measure 2 inches then your pitch is 212 which is very low.
Calculate the roof pitch as the proportion of rise and run.
Pitch of any roof can be computed by the number of inches it grows vertically for every 12 inches it extends horizontally. We want the PITCH in the form x12. Roof Pitch Calculator Results Explained. Recalculate this value into an angle.