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<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial","sans-serif";color:#1F497D">EJOTs are a German product designed for this kind of application. They have an application note that discusses purlin thickness, thread size, and pull out strength.
Mudge Fasteners carries them in the US.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial","sans-serif";color:#1F497D">Jeff Irish, PE</span><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial","sans-serif";color:#1F497D">President</span><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial","sans-serif";color:#1F497D">Hudson Valley Clean Energy, Inc.</span><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial","sans-serif";color:#1F497D">and Adirondack Solar</span><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial","sans-serif";color:#1F497D">13 Hook Road</span><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial","sans-serif";color:#1F497D">Rhinebeck, NY 12572</span><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial","sans-serif";color:#1F497D">T.845.876.3767x110</span><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial","sans-serif";color:#1F497D">F.845.876.3912</span><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial","sans-serif";color:#1F497D"><a href="mailto:jeff@hvce.com"><u><span style="color:blue">jeff@hvce.com</span></u></a></span><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p></o:p></span></p>
<p class="MsoNormal"><i><span style="font-size:10.0pt;font-family:"Arial","sans-serif";color:#1F497D">Solar Electric Systems</span></i><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p></o:p></span></p>
<p class="MsoNormal"><i><span style="font-size:10.0pt;font-family:"Arial","sans-serif";color:#1F497D">NYSERDA Eligible PV Installer</span></i><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p></o:p></span></p>
<p class="MsoNormal"><i><span style="font-size:10.0pt;font-family:"Arial","sans-serif";color:#1F497D">NABCEP Certified PV Installer</span></i><i><span style="font-size:10.0pt;font-family:"Arial","sans-serif";color:#1F497D"><o:p></o:p></span></i></p>
<p class="MsoNormal"><i><span style="font-size:10.0pt;font-family:"Arial","sans-serif";color:#1F497D">NABCEP Certified Technical Sales Professional</span></i><i><span style="font-size:10.0pt;font-family:"Arial","sans-serif";color:#1F497D"><o:p></o:p></span></i></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><b><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif"">From:</span></b><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif""> re-wrenches-bounces@lists.re-wrenches.org [mailto:re-wrenches-bounces@lists.re-wrenches.org]
<b>On Behalf Of </b>toddcory@finestplanet.com<br>
<b>Sent:</b> Thursday, March 15, 2012 3:51 PM<br>
<b>To:</b> RE-wrenches<br>
<b>Subject:</b> Re: [RE-wrenches] No underside access metal biulding attachment<o:p></o:p></span></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p style="margin:0in;margin-bottom:.0001pt"><span style="font-size:13.5pt;font-family:"Arial","sans-serif"">i think bob o once said he used ss pop rivets on a job like this.<o:p></o:p></span></p>
<p style="margin:0in;margin-bottom:.0001pt"><span style="font-size:13.5pt;font-family:"Arial","sans-serif""> <o:p></o:p></span></p>
<p style="margin:0in;margin-bottom:.0001pt"><span style="font-size:13.5pt;font-family:"Arial","sans-serif"">todd<o:p></o:p></span></p>
<p style="margin:0in;margin-bottom:.0001pt"><span style="font-size:13.5pt;font-family:"Arial","sans-serif""> <o:p></o:p></span></p>
<p style="margin:0in;margin-bottom:.0001pt"><span style="font-size:13.5pt;font-family:"Arial","sans-serif""> <o:p></o:p></span></p>
<p style="margin:0in;margin-bottom:.0001pt"><span style="font-size:13.5pt;font-family:"Arial","sans-serif""> <o:p></o:p></span></p>
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<span style="font-size:13.5pt;font-family:"Arial","sans-serif"">On Thursday, March 15, 2012 9:26am, "lars Ortegren" <<a href="mailto:lars@cal-solar.com">lars@cal-solar.com</a>> said:<o:p></o:p></span></p>
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<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 style="margin:0in;margin-bottom:.0001pt"><span style="font-size:13.5pt;font-family:"Arial","sans-serif""> <o:p></o:p></span></p>
<p style="margin:0in;margin-bottom:.0001pt"><span style="font-size:13.5pt;font-family:"Arial","sans-serif""> <o:p></o:p></span></p>
<p class="MsoNormal"><em><b>Lars Ortegren</b></em><o:p></o:p></p>
<p class="MsoNormal"> <o:p></o:p></p>
<p style="margin:0in;margin-bottom:.0001pt"><span style="font-size:13.5pt;font-family:"Arial","sans-serif""> <o:p></o:p></span></p>
<p style="margin:0in;margin-bottom:.0001pt"><span style="font-size:13.5pt;font-family:"Arial","sans-serif""> <o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Bodoni MT"">Director of Operations</span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:14.0pt;font-family:"Berlin Sans FB","sans-serif";color:#002060">California Solar Electric Company</span><o:p></o:p></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/"><u><span style="color:blue">http://www.californiasolarco.com/</span></u></a><o:p></o:p></p>
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<p class="MsoNormal">Phone : (530)274-3671<o:p></o:p></p>
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<p style="margin:0in;margin-bottom:.0001pt"><span style="font-size:13.5pt;font-family:"Arial","sans-serif""> <o:p></o:p></span></p>
<p class="MsoNormal"><em><b><span style="font-size:10.0pt;font-family:"Arial Unicode MS","sans-serif"">California C-10 Electical Contractor #779624</span></b></em><o:p></o:p></p>
<p class="MsoNormal"><em><b><span style="font-size:10.0pt;font-family:"Arial Unicode MS","sans-serif"">NABCEP Certified PV Installer # 091110-89</span></b></em><o:p></o:p></p>
<p class="MsoNormal"><em><b><span style="font-size:10.0pt;font-family:"Arial Unicode MS","sans-serif"">Certified NABCEP Continuing Education Provider</span></b></em><o:p></o:p></p>
<p class="MsoNormal">More about NABCEP:<o:p></o:p></p>
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