Specs

 e table at right shows the required
footing depth for 18” and 30” diameter
footings in Class 4 and Class 5 soils for
various tilt angles. Choose  e yellow
or orange lines depending on the color
of the square that corresponds to the tilt
angle, wind speed and snow load you are
planning for in the table above,
The table below shows the design wind speed for various module tilt
angles and maximum snow loads.
ASCE 7-10 ASCE 7-05
MPH MPH
110 85 60 or 72 60 or 72 60 or 72 60 or 72 60 ONLY
130 100 60 or 72 60 or 72 60 or 72 60 ONLY
140 108 60 or 72 60 or 72 60 or 72
150 116 60 or 72 60 or 72 60 ONLY
120 85 60 or 72 60 or 72 60 or 72
120 93 60 or 72 60 or 72 60 ONLY
130 100 60 or 72 60 or 72 60 ONLY
150 116 60 or 72 60 or 72
115 89 60 or 72 60 or 72 60 or 72
120 93 60 or 72 60 or 72 60 ONLY
130 100 60 or 72 60 or 72
150 116 60 ONLY 60 ONLY
115 89 60 or 72 60 or 72 60 ONLY
120 93 60 or 72 60 or 72 60 ONLY
130 100 60 ONLY 60 ONLY
110 85 60 or 72 60 or 72 60 or 72 60 ONLY 60 ONLY
115 89 60 or 72 60 or 72 60 or 72 60 ONLY
120 93 60 or 72 60 or 72 60 ONLY
130 100 60 ONLY 60 ONLY 60 ONLY
110 85 60 or 72 60 or 72 60 or 72 60 or 72 60 ONLY 60 ONLY
115 89 60 or 72 60 or 72 60 or 72 60 or 72 60 ONLY
120 93 60 or 72 60 or 72 60 or 72 60 ONLY 60 ONLY
130 100 60 ONLY 60 ONLY 60 ONLY 60 ONLY
120 93 60 or 72 60 or 72 60 or 72 60 or 72 60 or 72 60 or 72
130 100 60 ONLY 60 ONLY 60 ONLY 60 ONLY 60 ONLY 60 ONLY
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Design Wind Speed
0 psf 20 psf 30 psf 40 psf 50 psf10 psf
Ground Snow Load
18" 30" 18" 30"
0° 4.00 3.50 3.75 3.25
0° 4.50 3.75 3.75 3.25
10° 4.00 3.25 3.50 3.00
10° 4.50 3.75 4.00 3.25
20° 4.75 4.00 4.25 3.50
20° 5.25 4.25 4.50 3.75
30° 5.25 4.25 4.50 3.75
30° 6.50 5.25 5.50 4.50
40° 5.75 4.75 5.00 4.00
40° 7.25 5.75 6.00 5.00
50° 6.75 5.50 5.75 4.75
50° 7.50 6.25 6.50 5.25
60° 6.75 5.50 5.75 4.75
60° 8.00 6.50 6.75 5.50
TILT ANGLE
Footing Depths (feet)
Soil Type Class 5 Class 4
Footing Diameter