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</o:shapelayout></xml><![endif]--></head><body lang=EN-US link=blue vlink=purple><div class=WordSection1><p class=MsoNormal>Wrenches,<o:p></o:p></p><p class=MsoNormal>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 ?<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal><b><i>Lars Ortegren<o:p></o:p></i></b></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal><span style='font-family:"Bodoni MT","serif"'>Director of Operations<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:14.0pt;font-family:"Berlin Sans FB","sans-serif";color:#002060'>California Solar Electric Company<o:p></o:p></span></p><p class=MsoNormal>10141 Evening Star Drive, Suite 6<o:p></o:p></p><p class=MsoNormal>Grass Valley, CA 95945<o:p></o:p></p><p class=MsoNormal><a href="http://www.californiasolarco.com/">http://www.californiasolarco.com/</a><o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>Phone : (530)274-3671<o:p></o:p></p><p class=MsoNormal>Fax: (530)274-7518<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal><b><i><span style='font-size:10.0pt;font-family:"Arial Unicode MS","sans-serif"'>California C-10 Electical Contractor #779624<o:p></o:p></span></i></b></p><p class=MsoNormal><b><i><span style='font-size:10.0pt;font-family:"Arial Unicode MS","sans-serif"'>NABCEP Certified PV Installer # 091110-89<o:p></o:p></span></i></b></p><p class=MsoNormal><b><i><span style='font-size:10.0pt;font-family:"Arial Unicode MS","sans-serif"'>Certified NABCEP Continuing Education Provider<o:p></o:p></span></i></b></p><p class=MsoNormal>More about NABCEP:<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>http://www.nabcep.org/<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p></div></body></html>