Measure your roof (length and width)
and include overhangs. This can be done from the ground
without the need of a ladder.
2.
Use slope triangle chart below to determine
the slope of your roof. Slope is the ratio of the rise
of the roof in inches, to the run of the roof in feet.
3.
Calculate shingle needs with the Easy
Estimator on next page.
Slope
Factors
2:12
1.01
3:12
1.03
4:12
1.05
5:12
1.08
6:12
1.12
8:12
1.20
10:12
1.30
12:12
1.41
14:12
1.54
16:12
1.67
18:12
1.80
To determine slope, stand back and
line up appropriate calculator slope to actual roof line.
Cut out the angle that matches your roof line.
