Roofing Slopes
| Fall/Run |
| Slope Ratio |
Inch / Foot |
mm / m |
Percentage |
Slope Angle |
|
|
|
|
Degrees / Minutes |
| 1:1 |
12" in 12" |
1000.0 |
100.0 |
45 |
- |
00 |
| 1:2 |
6" in 12" |
500.0 |
50.0 |
26 |
- |
34 |
| 1:3 |
4" in 12" |
333.3 |
33.3 |
18 |
- |
26 |
| 1:4 |
3" in 12" |
250.0 |
25.0 |
14 |
- |
02 |
| 1:5 |
-- |
200.0 |
20.0 |
11 |
- |
19 |
| 1:6 |
2" in 12" |
166.7 |
16.7 |
9 |
- |
28 |
| 1:7 |
-- |
142.9 |
14.29 |
8 |
- |
08 |
| 1:8 |
1-1/2" in 12" |
125.0 |
12.5 |
7 |
- |
08 |
| 1:9 |
-- |
111.1 |
11.1 |
6 |
- |
20 |
| 1:10 |
1-1/2" in 12"* |
100.0 |
10.0 |
5 |
- |
43 |
| 1:11 |
-- |
90.9 |
9.09 |
5 |
- |
12 |
| 1:12 |
1" in 12" |
83.0 |
8.3 |
4 |
- |
46 |
| 1:13 |
-- |
76.9 |
7.69 |
4 |
- |
24 |
| 1:14 |
-- |
71.4 |
7.14 |
4 |
- |
05 |
| 1:15 |
3/4" in 12"* |
67.0 |
6.7 |
3 |
- |
49 |
| 1:20 |
5/8" in 12"* |
50.0 |
5.0 |
2 |
- |
52 |
| 1:25 |
1/2" in 12"* |
40.0 |
4.0 |
2 |
- |
17 |
| 1:30 |
-- |
33.3 |
3.33 |
1 |
- |
55 |
| 1:40 |
-- |
25.0 |
2.5 |
1 |
- |
26 |
| 1:50 |
1/4" in 12"* |
20.0 |
2.0 |
1 |
- |
09 |
| 1:60 |
-- |
16.7 |
1.67 |
0 |
- |
57 |
| 1:80 |
-- |
12.5 |
1.25 |
0 |
- |
43 |
| 1:100 |
1/8" in 12"* |
10.0 |
1.0 |
0 |
- |
34 |
|
* (Nominal) |
|
|
|
|
|
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