<html><head><meta http-equiv="content-type" content="text/html; charset=utf-8"></head><body dir="auto"><div>William </div><div>For what it's worth, you may want to check with the rafter mfgr and/or Eng as it is possible they will not allow holes being drilled into them and you could open yourself up to liability issues. </div><div>I have a structural eng who is insisting I squeeze a construction adhesive (such as LePage PL400) into pilot holes before screwing in the lags when attaching to engineered trusses. Yes, an adhesive, not a sealant. It is to reinforce the strength of the engineered truss that you have just drilled into. </div><div><br></div><div>Easy feet or other attachments that have multiple lags per attachment point (kinetic flashings have two lags each) are good because they have better/more holding strength if your lag bolt passes thru the structural attachment (a typical lag bolt will stick out about an inch or more past a 2x4 rafter/truss when laid flat, so your lag has less pull-out strength (thread depth). Multiple lags per attachment remedies this. </div><div>Or consider installing backboards between the rafters and attaching to them. </div><div><br><div><span class="Apple-style-span" style="-webkit-tap-highlight-color: rgba(26, 26, 26, 0.296875); -webkit-composition-fill-color: rgba(175, 192, 227, 0.230469); -webkit-composition-frame-color: rgba(77, 128, 180, 0.230469); ">benn</span></div><div><span class="Apple-style-span" style="-webkit-tap-highlight-color: rgba(26, 26, 26, 0.296875); -webkit-composition-fill-color: rgba(175, 192, 227, 0.230469); -webkit-composition-frame-color: rgba(77, 128, 180, 0.230469); ">Sent from a 'smart' phone, with touch screen keys. Please excuse shortcuts and typos. </span></div></div><div><br>On Nov 6, 2013, at 11:14 AM, "William Miller" <<a href="mailto:william@millersolar.com">william@millersolar.com</a>> wrote:<br><br></div><blockquote type="cite"><div><meta http-equiv="Content-Type" content="text/html; charset=us-ascii"><meta name="Generator" content="Microsoft Word 14 (filtered medium)"><!--[if !mso]><style>v\:* {behavior:url(#default#VML);}
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</o:shapelayout></xml><![endif]--><div class="WordSection1"><p class="MsoNormal"><span style="font-size:12.0pt;font-family:"Arial","sans-serif"">Friends:<o:p></o:p></span></p><p class="MsoNormal"><span style="font-size:12.0pt;font-family:"Arial","sans-serif""><o:p> </o:p></span></p><p class="MsoNormal"><span style="font-size:12.0pt;font-family:"Arial","sans-serif"">I am designing an installation on a roof built with engineered rafters. These are wood I-beams with 2X4s (or smaller) on flat, dadoed to accept an OSB flange in between. On top is sheeting and then sheet metal. I have never attached to engineered rafters<o:p></o:p></span></p><p class="MsoNormal"><span style="font-size:12.0pt;font-family:"Arial","sans-serif""><o:p> </o:p></span></p><p class="MsoNormal"><span style="font-size:12.0pt;font-family:"Arial","sans-serif"">I checked on DPW easy Feet and they look like my best option so far. . Has anyone else done this before?<o:p></o:p></span></p><p class="MsoNormal"><span style="font-size:12.0pt;font-family:"Arial","sans-serif""><o:p> </o:p></span></p><p class="MsoNormal"><span style="font-size:12.0pt;font-family:"Arial","sans-serif"">Thanks in advance for all the great idea I you professionals are willing to share.<o:p></o:p></span></p><p class="MsoNormal"><span style="font-size:12.0pt;font-family:"Arial","sans-serif""><o:p> </o:p></span></p><p class="MsoNormal"><span style="font-size:12.0pt;font-family:"Arial","sans-serif"">William Miller<o:p></o:p></span></p><p class="MsoNormal"><span style="font-size:12.0pt;font-family:"Arial","sans-serif""><o:p> </o:p></span></p><p class="MsoNormal"> <span style="font-family:"Times New Roman","serif""><o:p></o:p></span></p><p class="MsoNormal"><image003.jpg><o:p></o:p></p><p class="MsoNormal"><span style="font-family:"Arial","sans-serif"">17395 Oak Rd. Atascadero, CA 93422</span><o:p></o:p></p><p class="MsoNormal"><span style="font-family:"Arial","sans-serif""><a href="http://www.millersolar.com/"><span style="color:blue">www.millersolar.com</span></a></span><o:p></o:p></p><p class="MsoNormal"><span style="font-family:"Arial","sans-serif"">805-438-5600 voice</span><o:p></o:p></p><p class="MsoNormal"><o:p> </o:p></p></div></div></blockquote><blockquote type="cite"><div><span>_______________________________________________</span><br><span>List sponsored by Home Power magazine</span><br><span></span><br><span>List Address: <a href="mailto:RE-wrenches@lists.re-wrenches.org">RE-wrenches@lists.re-wrenches.org</a></span><br><span></span><br><span>Change email address & settings:</span><br><span><a href="http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org">http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org</a></span><br><span></span><br><span>List-Archive: <a href="http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org">http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org</a></span><br><span></span><br><span>List rules & etiquette:</span><br><span><a href="http://www.re-wrenches.org/etiquette.htm">www.re-wrenches.org/etiquette.htm</a></span><br><span></span><br><span>Check out participant bios:</span><br><span><a href="http://www.members.re-wrenches.org">www.members.re-wrenches.org</a></span><br><span></span><br></div></blockquote></body></html>