<html><head></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space; ">In general, you shouldn't drill or cut the flanges on engineered wood beams. I think that eliminates lag screws into the rafters. They probably wouldn't have the same pull-out strength as a lag screw into a conventional rafter, either.<div><br></div><div>Scott<br><div><br><div><div>On Oct 19, 2010, at 7:58 PM, Chris Daum wrote:</div><br class="Apple-interchange-newline"><blockquote type="cite"><span class="Apple-style-span" style="border-collapse: separate; font-family: Helvetica; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; orphans: 2; text-indent: 0px; text-transform: none; white-space: normal; widows: 2; word-spacing: 0px; -webkit-border-horizontal-spacing: 0px; -webkit-border-vertical-spacing: 0px; -webkit-text-decorations-in-effect: none; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px; font-size: medium; "><div lang="EN-US" vlink="purple" link="blue"><div dir="ltr" align="left"><o:p><font face="Comic Sans MS" color="#800000"><span class="177075402-20102010">Dear Wrenches:</span></font></o:p></div><div dir="ltr" align="left"><o:p><font face="Comic Sans MS" color="#800000"><span class="177075402-20102010"></span></font></o:p> </div><div dir="ltr" align="left"><o:p><font face="Comic Sans MS" color="#800000"><span class="177075402-20102010">I have a composite (shingle) roof at hand, and the owner wants to upgrade it to a metal roof and install a 5kw+ array on it. The rafters are those (sort of) particle board I-beams covered with 1/2" plywood (and shingles). What's the best metal roofing you could suggest--and would you beef up the wood to lag into?</span></font></o:p></div><div dir="ltr" align="left"><o:p><font face="Comic Sans MS" color="#800000"><span class="177075402-20102010"></span></font></o:p> </div><div dir="ltr" align="left"><o:p><font face="Comic Sans MS" color="#800000"><span class="177075402-20102010">Thanks for all your input.</span></font></o:p></div><div dir="ltr" align="left"><o:p><font face="Comic Sans MS" color="#800000"><span class="177075402-20102010"></span></font></o:p> </div><div dir="ltr" align="left"><o:p><font face="Comic Sans MS" color="#800000"><span class="177075402-20102010"><div align="left"><div align="left"><font face="Comic Sans MS" color="#000080" size="2">Chris Daum</font></div><div align="left"><font face="Comic Sans MS" color="#000080" size="2">Oasis Montana Inc.</font></div><div align="left"><font face="Comic Sans MS" color="#000080" size="2">406-777-4309</font></div><div align="left"><font face="Comic Sans MS" color="#000080" size="2">406-777-0830 fax</font><font face="Comic Sans MS" color="#000080" size="3"><span class="046344020-29052008"></span></font></div></div></span></font></o:p></div>_______________________________________________<br>List sponsored by Home Power magazine<br><br>List Address:<span class="Apple-converted-space"> </span><a href="mailto:RE-wrenches@lists.re-wrenches.org" style="color: blue; text-decoration: underline; ">RE-wrenches@lists.re-wrenches.org</a><br><br>Options & settings:<br><a href="http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org" style="color: blue; text-decoration: underline; ">http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org</a><br><br>List-Archive:<span class="Apple-converted-space"> </span><a href="http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org" style="color: blue; text-decoration: underline; ">http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org</a><br><br>List rules & etiquette:<br><a href="http://www.re-wrenches.org/etiquette.htm" style="color: blue; text-decoration: underline; ">www.re-wrenches.org/etiquette.htm</a><br><br>Check out participant bios:<br><a href="http://www.members.re-wrenches.org/" style="color: blue; text-decoration: underline; ">www.members.re-wrenches.org</a><br><br></div></span></blockquote></div><br></div></div></body></html>