Run them by hand, which is what I do. It is not a complicated calculation. You will find that the roof corners are highest, the edge 3' are next, and the internal sections lowest. For 110 mph wind on a two story residence, I am getting numbers of approx. 60 psf corners, 45 psf edges and 25 psf internal. The racking lengths and connection point locations can drive those psf values very quickly into 1 kip loads, especially when the installer wants to limit the number of roof penetrating connection points. Don't always rely on the computer. Running something like this by hand gives you a good feel for exactly what is going on.
Thank You, Mark Benjamin
Crown Jade Design and Engineering, Inc.
(970) 472 2394 www.crownjade.com
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From: info@theedengroup.com [mailto:info@theedengroup.com]
Sent: Friday, September 30, 2011 11:58 AM
To: seaint@seaint.org
Subject: SOLAR PANELS ON ROOF WIND UPLIFT DESIGN
I AM LOOKING FOR A GOOD REFERENCE/SPREADSHEET/SOFTWARE FOR DETERMINING THE UPLIFT FOR ROOF MOUNTED SOLAR PANELS.
Regards
Joseph T. Eden, PE,MS,CEO
THE EDEN GROUP
14416 FRIAR STREET# A
VAN NUYS,CA 91401
TEL. 818-788-1481
FAX 818-232-9130
CELL.818-679-8180
INFO@THEEDENGROUP.COM
WWW.THEEDENGROUP.COM
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