<html><head><style type="text/css"><!-- DIV {margin:0px;} --></style></head><body><div style="font-family:times new roman, new york, times, serif;font-size:12pt"><DIV>Wrenches,</DIV>
<DIV>I used S5 clamps with UniRac rails and L-feet. I see that S5 clamps can also be used directly for fastening solar modules to standing-seam roofs. The obvious advantage is lower cost, but are there any disadvantages? If you used S5 clamps without rails, did you have to get a licensed engineer's wind-loading structural analysis? Thank you very much for your advice.</DIV>
<DIV>Joel Davidson</DIV>
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