Wrenches, We have a project coming up where we are installing a large array on a low slope metal building with metal purlins. Typically we would through bolt our attachment to the purlins, but in this case the building is a self-storage, and access is not an option. Does anyone out there have experience with any top side only metal-metal attachments? I've thought about using some larger sized stainless self-tapping screws, but I worry about the pull out strength (as the roof combined with the c-channel purlins are only about 1/8") and the effects of heat and cooling of the roof backing the screws out over time. Any thoughts ?
Lars Ortegren Director of Operations California Solar Electric Company 10141 Evening Star Drive, Suite 6 Grass Valley, CA 95945 http://www.californiasolarco.com/ Phone : (530)274-3671 Fax: (530)274-7518 California C-10 Electical Contractor #779624 NABCEP Certified PV Installer # 091110-89 Certified NABCEP Continuing Education Provider More about NABCEP: http://www.nabcep.org/
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