<div dir="ltr"><div><div><a href="http://www.oatey.com/brands/oatey/regions/canada/products/flashings/roof-flashings/retro-master-flash-roof-flashings" target="_blank">http://www.oatey.com/brands/oatey/regions/canada/products/flashings/roof-flashings/retro-master-flash-roof-flashings</a><br></div></div><div><br></div>Well, the manufacturer calls it a flashing, but I agree that were talking semantics here. Flashing, in the code sense, is applied liberally in practice. The washers on the thousands of screws on a 5V metal roof must be flashings, otherwise these roofs do not meet IBC, right? Same goes for vents with boots... Unless you don't call fasteners penetrations, in which case you can't hold solar attachment fasteners to a different standard. I realize that logic escapes code writers and interpreters sometimes, but I think rational people can see it both ways. There are plenty of metal roof products that are sealed (flashed?) with EPDM gaskets or butyl tape (Sunmodo, Eco-Fasten, S-5, etc.), that are successfully implemented in real world scenarios.<div><br></div><div>There are really two issues here: clarifying what is acceptable from a code perspective, and industry best practices. Both issues have interpretations and preferences, most with merit and based on lots of experience.<br></div><div><br></div><div>Martini shaken or stirred? We're probably not going to agree on a single solution as an industry.</div><div><br></div><div>I have metal flashings on my shingle roof at home - it's my preference, but I don't think it is a requirement, nor do I think "unflashed" fasteners are unacceptable.</div><div class="gmail_extra"><br clear="all"><div><div><div dir="ltr"><div><div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr"><span><br><div dir="ltr" style="margin-left:0pt"></div></span></div></div></div></div></div></div></div></div></div>
Jason</div><div class="gmail_extra"><br></div><div class="gmail_extra"><br><div class="gmail_quote">On Fri, Aug 7, 2015 at 5:11 PM, Kurt Johnsen <span dir="ltr"><<a href="mailto:kjenergysystems@gmail.com" target="_blank">kjenergysystems@gmail.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir="ltr"><div>Not that the names of things matter that much but imho "flashing" does require an overlapping of some kind. An Oatey boot for a metal roof is more of a bedded fitting than a flashing. It relies entirely on fasteners and a sealing membrane whereas flashings rely mostly on natural forces like gravity. Perhaps an experienced roofer weigh in on this.<span><font color="#888888"><br><br></font></span></div><span><font color="#888888">Kurt Johnsen<br></font></span></div><div><div><div class="gmail_extra"><br><div class="gmail_quote">On Fri, Aug 7, 2015 at 3:21 PM, Jason Szumlanski <span dir="ltr"><<a href="mailto:jason@floridasolardesigngroup.com" target="_blank">jason@floridasolardesigngroup.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir="ltr"><span>"If you place a flat object on top of roofing without an uphill material lapping over the downhill object, you are not flashing. "<div><br></div></span><div>By that logic, an Oatey boot is not a flashing for a plumbing vent on a metal roof.</div><div><br></div><div>Just sayin'...</div><div><span><font color="#888888"><br><div class="gmail_extra"><br>Jason Szumlanski</div><div class="gmail_extra"><br></div></font></span><div class="gmail_extra"><br><div class="gmail_quote"><div><div>On Fri, Aug 7, 2015 at 2:19 PM, William Miller <span dir="ltr"><<a href="mailto:william.miller@millersolar.com" target="_blank">william.miller@millersolar.com</a>></span> wrote:<br></div></div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div><div><div bgcolor="white" link="blue" vlink="purple" lang="EN-US"><div><p class="MsoNormal"><span style="font-family:"Arial","sans-serif";color:#1f497d">Ray:<u></u><u></u></span></p><p class="MsoNormal"><span style="font-family:"Arial","sans-serif";color:#1f497d"><u></u> <u></u></span></p><p class="MsoNormal"><span style="font-family:"Arial","sans-serif";color:#1f497d">I have to respectfully disagree with your semantics. A flashing is an overlapping of roofing materials such that gravity will direct rain and melt water off of the roof. This is a universally accepted waterproofing method that does not depend on any sealant material. The concept is as ancient as the first, crude, thatched roof.<u></u><u></u></span></p><p class="MsoNormal"><span style="font-family:"Arial","sans-serif";color:#1f497d"><u></u> <u></u></span></p><p class="MsoNormal"><span style="font-family:"Arial","sans-serif";color:#1f497d">If you place a flat object on top of roofing without an uphill material lapping over the downhill object, you are not flashing. <u></u><u></u></span></p><p class="MsoNormal"><span style="font-family:"Arial","sans-serif";color:#1f497d"><u></u> <u></u></span></p><p class="MsoNormal"><span style="font-family:"Arial","sans-serif";color:#1f497d">What you have described is sealant-dependent weatherproofing. Regardless of the quality of the sealant, or lack thereof, I don’t think you can call it a flashed attachment.<u></u><u></u></span></p><p class="MsoNormal"><span style="font-family:"Arial","sans-serif";color:#1f497d"><u></u> <u></u></span></p><p class="MsoNormal"><span style="font-family:"Arial","sans-serif";color:#1f497d">(The overarching point is a flashed attachment does not depend on a sealant. Any sealant has a finite lifespan. Removing the sealant variable from the equation results in more lasting installation.)<u></u><u></u></span></p><p class="MsoNormal"><span style="font-family:"Arial","sans-serif";color:#1f497d"> <u></u><u></u></span></p><p class="MsoNormal"><span style="font-family:"Arial","sans-serif";color:#1f497d">Sincerely,<u></u><u></u></span></p><p class="MsoNormal"><span style="font-family:"Arial","sans-serif";color:#1f497d"><u></u> <u></u></span></p><p class="MsoNormal"><span style="font-family:"Arial","sans-serif";color:#1f497d">William Miller<u></u><u></u></span></p><p class="MsoNormal"><span style="font-family:"Arial","sans-serif";color:#1f497d"><u></u> <u></u></span></p><p class="MsoNormal"><span style="font-family:"Arial","sans-serif";color:#1f497d"><u></u> <u></u></span></p><div><p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial","sans-serif""><img src="cid:image003.jpg@01D0D101.8C051460" alt="Gradient Cap_mini" height="28" width="64"><br>Lic 773985<br><a href="http://www.millersolar.com/" target="_blank"><span style="color:blue">millersolar.com</span></a><br><a href="tel:805-438-5600" value="+18054385600" target="_blank">805-438-5600</a><u></u><u></u></span></p></div><p class="MsoNormal"><span style="font-family:"Arial","sans-serif";color:#1f497d"><u></u> <u></u></span></p><div><div style="border:none;border-top:solid #b5c4df 1.0pt;padding:3.0pt 0in 0in 0in"><p class="MsoNormal"><b><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif";color:windowtext">From:</span></b><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif";color:windowtext"> RE-wrenches [mailto:<a href="mailto:re-wrenches-bounces@lists.re-wrenches.org" target="_blank">re-wrenches-bounces@lists.re-wrenches.org</a>] <b>On Behalf Of </b>Ray Walters<br><b>Sent:</b> Friday, August 07, 2015 10:34 AM<br><b>To:</b> RE-wrenches<span><br><b>Subject:</b> Re: [RE-wrenches] to flash or not to flash<u></u><u></u></span></span></p></div></div><p class="MsoNormal"><u></u> <u></u></p><p class="MsoNormal">My opinion is that if the L foot has enough surface area it constitutes a flashing, and that large flashings can actually cause more damage to the roof than they prevent.<span><br>I also agree that an attachement doesn't constitute a penetration. I just finished an install on a metal roof with hundreds of screw holes. We added a few more screw holes, and ours have 20 times the sealant surface area. We did run a 1" conduit through the roof, and since it was an actual penetration, we used a very expensive flexible boot flashing.<br>Personally, I think we need about a 3"x3" or 4" x 4" L foot with a double stick butyl tape on the bottom, and all will be well.<br>I realize that the OP was referring to asphalt, but I will flash other roof types that don't do well with L feet ( like shake).<br><br><u></u><u></u></span></p><p class="MsoNormal"><u></u> <u></u></p></div></div><br></div></div><span>_______________________________________________<br>
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