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Hi William;<br>
<br>
I agree with the overlapping roof elements concept, as I mentioned
in my previous post. However in many cases, (metal roofs for
instance) the flashing can not be overlapped as you described, and
is sealed with adhesive. It is still called a flashing, and is
still acceptable to roofers.<br>
<img src="cid:part1.07010206.04070306@solarray.com" class="irc_mi"
style="margin-top: 0px;" height="393" width="295"><br>
<br>
<pre class="moz-signature" cols="72">R.Ray Walters
CTO, Solarray, Inc
Nabcep Certified PV Installer,
Licensed Master Electrician
Solar Design Engineer
303 505-8760</pre>
<div class="moz-cite-prefix">On 8/7/2015 12:19 PM, William Miller
wrote:<br>
</div>
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<div class="WordSection1">
<p class="MsoNormal"><span
style="font-family:"Arial","sans-serif";color:#1F497D">Ray:<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-family:"Arial","sans-serif";color:#1F497D"><o:p> </o:p></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.<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-family:"Arial","sans-serif";color:#1F497D"><o:p> </o:p></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. <o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-family:"Arial","sans-serif";color:#1F497D"><o:p> </o:p></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.<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-family:"Arial","sans-serif";color:#1F497D"><o:p> </o:p></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.)<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-family:"Arial","sans-serif";color:#1F497D">
<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-family:"Arial","sans-serif";color:#1F497D">Sincerely,<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-family:"Arial","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span
style="font-family:"Arial","sans-serif";color:#1F497D">William
Miller<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-family:"Arial","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span
style="font-family:"Arial","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
<div>
<p class="MsoNormal"><span
style="font-size:10.0pt;font-family:"Arial","sans-serif""><img
id="Picture_x0020_1"
src="cid:part2.09060400.04080500@solarray.com"
alt="Gradient Cap_mini" height="28" width="64"><br>
Lic 773985<br>
<a moz-do-not-send="true"
href="http://www.millersolar.com/"><span
style="color:blue">millersolar.com</span></a><br>
805-438-5600<o:p></o:p></span></p>
</div>
<p class="MsoNormal"><span
style="font-family:"Arial","sans-serif";color:#1F497D"><o:p> </o:p></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
[<a class="moz-txt-link-freetext" href="mailto:re-wrenches-bounces@lists.re-wrenches.org">mailto: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<br>
<b>Subject:</b> Re: [RE-wrenches] to flash or not to
flash<o:p></o:p></span></p>
</div>
</div>
<p class="MsoNormal"><o:p> </o:p></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.<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>
<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
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