Installation Manual
DynoRaxx Evolution PR Guide to Code Compliant Installation
9 | P a g e 8 6 6 . 6 2 0 . 2 4 1 0 | d y n o r a x x . c o m
Task 6: Calculate the Effective Wind Area, A. As defined in section 6.2 of the ASCE, this area is taken to be the
“span length multiplied by an effective width that need not be less than one-third the span length.” In other
words, the Effective Wind Area is the area of the smallest continuous configuration of modules that will be
installed. If this area is greater than 100 square feet, then 100 will be used.
Task 7: Determine the Roof & Wall Zone. The total design wind load is dependent upon where the installation
is located on the roof. To determine the specific zones, follow these steps:
1. Calculate the length of the least horizontal dimension. The corresponding value a will be 10% of this
dimension. Furthermore, take 40% of the mean roof height, h.
2. Compare a and .4h, and take the smaller value of the two. This value should not be less than 3 feet or
4% of the least horizontal dimension. Please see the chart below.
3. Finally, calculate the roof zone in accordance to the installation site. Determine , the angle of the
roof from the horizontal. See the figure on the next page.
For more information please refer to figure 6-3 of the ASCE 7-05.
Roof
Height
(ft)
Least Horizontal Dimension (ft)
10
20
30
40
50
60
70
80
90
100
150
200
10
3
3
3
4
4
4
4
4
4
4
6
8
20
3
3
3
4
5
6
7
8
8
8
8
8
30
3
3
3
4
5
6
7
8
9
10
12
12
40
3
3
3
4
5
6
7
8
9
10
15
16
50
3
3
3
4
5
6
7
8
9
10
15
20
60
3
3
3
4
5
6
7
8
9
10
15
20