Figure 1 - Roof pitch or slope
If you are planning to purchase new roofing material it is important to know the slope or pitch of the roof because certain roofing materials are designed for a minimum and/or maximum roof slope or pitch.
How To Measure Roof Slope Or Pitch:
Mark a straight level at a point 12-inches from the end. Place the end of the level against the roof and adjust it so that the bubble is level. Using a tape measure or ruler, measure the height from the roof to the point on the 12-inch point that you have marked on the level. This will provide you with the slope number of your roof, as shown in Figure 2.