10
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SWH Solar Racking Installation Guide | Version 12.10.v2
192a
STANDARDS 7-10
Table 2. Determine Roof/Wall Zone dimension (a) according to building width and height
a = 10 percent of the least horizontal dimension or 0.4h whichever is smaller, but not less than either 4% of the least
horizontal dimension or 3 ft of the building.
Roof
Height (ft) 10
3
3
3
3
3
3
3
3
3
3
15
3
3
3
3
3
3
3
3
3
3
20
3
3
3
3
3
3
3
3
3
3
25
3
3
3
3
3
3
3
3
3
3
30
3
3
3
3
3
3
3
3
3
3
40
4
4
4
4
4
4
4
4
4
4
50
4
5
5
5
5
5
5
5
5
5
60
4
6
6
6
6
6
6
6
6
6
70
4
6
7
7
7
7
7
7
7
7
80
4
6
8
8
8
8
8
8
8
8
90
4
6
8
9
9
9
9
9
9
9
100
4
6
8
10
10
10
10
10
10
10
125
5
6
8
10
12
12.5
12.5
12.5
12.5
12.5
150
6
6
8
10
12
14
15
15
15
15
175
7
7
8
10
12
14
16
17.5
17.5
17.5
200
8
8
8
10
12
14
16
18
20
20
10
15
20
25
30
35
40
45
50
60
[1.2.] Procedure to Calculate Total Design Wind Load per ASCE 7-10
Step 5. Determine the appropriate roof zone for the installation (continued)
Using the Roof Zone Dimension Length, a, determine the roof zone locations according to your roof
type, gable, hip or monoslope. Determine in which roof zone your pv system is located, Zone 1, 2,
or 3 according to Figure 3, page 16.
300
12
12
12
12
12
14
16
18
20
24
400
16
16
16
16
16
16
16
18
20
24
500
20
20
20
20
20
20
20
20
20
24
Least Horizontal Dimensions (ft)
15
