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<div class=Section1>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>Glenn and Peter,<o:p></o:p></span></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:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>I just reviewed a few of the Technical Data sheets for Sikaflex
and they do caution its use with asphalt shingles. They make the statement that
these products should not be used in the presence of a product that might “bleed
oil.” Of course the asphalt in shingles can bleed oil, but it will have
this affect on all sealants other than tar. <o:p></o:p></span></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:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>Tar does not have good adhesion to many materials, including
aluminum, so I believe Sika is simply covering their buttocks. Alternatively,
DAP has a nearly identical product that does recommend use on asphalt shingles.
It is not substantially different and would still have the issues of “bleeding
oil”. However, history tells us that these polyurethane caulks are exceptional
in their durability on comp shingle roofs, so use the DAP product if you think
the caulk manufacturer needs to backup the application.<o:p></o:p></span></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:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>Bill.<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","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"'>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>Glenn
Burt<br>
<b>Sent:</b> Monday, September 15, 2008 10:02 AM<br>
<b>To:</b> 'RE-wrenches'<br>
<b>Subject:</b> Re: [RE-wrenches] Stanchions for Comp Shingle Roofs<o:p></o:p></span></p>
</div>
</div>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>Quick item on Approach #1 bares repeating – Sika is
incompatible with asphalt shingle roofing according to the manufacturer…<o:p></o:p></span></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:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:10.5pt;font-family:Consolas;
color:#1F497D'>Regards,<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:10.5pt;font-family:Consolas;
color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:10.5pt;font-family:Consolas;
color:#1F497D'>Glenn Burt<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:10.5pt;font-family:Consolas;
color:#1F497D'>Technical Specialist<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:10.5pt;font-family:Consolas;
color:#1F497D'>Renewable Power Systems, LLC<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:10.5pt;font-family:Consolas;
color:#1F497D'>PO Box 967<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:10.5pt;font-family:Consolas;
color:#1F497D'>Averill Park, NY 12018<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:10.5pt;font-family:Consolas;
color:#1F497D'>V: 518-674-5808<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:10.5pt;font-family:Consolas;
color:#1F497D'>C: 518-810-3174<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:10.5pt;font-family:Consolas;
color:#1F497D'>F: 518-514-1175<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:10.5pt;font-family:Consolas;
color:#1F497D'>E: <a href="mailto:gburt@RPSPower.com">gburt@RPSPower.com</a><o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:10.5pt;font-family:Consolas;
color:#1F497D'><a href="http://www.RPSpower.com">www.RPSpower.com</a><o:p></o:p></span></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:11.0pt;font-family:"Calibri","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"'>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>Peter
Parrish<br>
<b>Sent:</b> Monday, September 15, 2008 12:28 PM<br>
<b>To:</b> 'RE-wrenches'<br>
<b>Subject:</b> Re: [RE-wrenches] Stanchions for Comp Shingle Roofs<o:p></o:p></span></p>
</div>
</div>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal><span style='color:black'>I’m not sure if we have
discussed this before, but I would like to get opinions on the relative merits
of the following two approaches to setting stanchions and flashing them in for
a roof mounted PV system:</span><o:p></o:p></p>
<p class=MsoNormal><span style='color:black'> </span><o:p></o:p></p>
<p class=MsoNormal><span style='color:black'>Existing comp shingle roof in good
condition. Professional Solar Fast-Jacks (or similar stanchions that result in
a ¾” to 1” post to which to attach rails). I am not endorsing
ProSolar products, I just wanted a specific example to work with.</span><o:p></o:p></p>
<p class=MsoNormal><span style='color:black'> </span><o:p></o:p></p>
<p class=MsoNormal><span style='color:black'>Approach #1: Lag stanchions
directly onto existing comp shingle roof; cut a inverted “U” into
the top layer of shingle; slip in Oatey-style flashing (9”x12”,
with an elastomeric ring); seal exposed vertical edges of flashing with a bead of
high quality caulk (Sika 1A)</span><o:p></o:p></p>
<p class=MsoNormal><span style='color:black'> </span><o:p></o:p></p>
<p class=MsoNormal><span style='color:black'>Approach #2: Remove shingles down
to the felt; lag stanchion; replace shingles incorporating full-sized
(15”x18”) flashing and seal top of flashing with high-quality
caulk.</span><o:p></o:p></p>
<p class=MsoNormal><span style='color:black'> </span><o:p></o:p></p>
<p class=MsoNormal><span style='color:black'>Obviously, approach #2 takes
longer and costs more, but does it confer commensurate benefit? If the
resulting stanchion/flashing were exposed to the elements, I would tend to
favor the latter approach; and if we were dealing with new construction the
difference in time and money would not be significant. However, if the
stanchion/flashing lies directly underneath a PV module, it will be shaded from
the deleterious effects of UV sunlight and will not receive any direct rain or
snow accumulation. Under these specific circumstances, I would argue that approach
#1 should be more than adequate and last at least as long as an existing comp
shingle roof. </span><o:p></o:p></p>
<p class=MsoNormal><span style='color:black'> </span><o:p></o:p></p>
<p class=MsoNormal><span style='color:black'>For those of you who haven’t
seen the Fast-Jack/Oatey approach, you might want to look at <a
href="http://www.prosolar.com/Oateys.htm">http://www.prosolar.com/Oateys.htm</a>.
</span><o:p></o:p></p>
<p class=MsoNormal><span style='color:black'> </span><o:p></o:p></p>
<p class=MsoNormal><span style='color:black'> - Peter</span><o:p></o:p></p>
<div>
<p><span style='font-size:10.0pt;font-family:"Arial","sans-serif";color:navy'>Peter
T. Parrish, Ph.D., President<br>
California Solar Engineering, Inc.<br>
820 Cynthia Ave., Los Angeles, CA 90065<br>
Ph 323-258-8883, Mobile 323-839-6108, Fax 323-258-8885<br>
CA Lic. 854779, NABCEP Cert. 031806-26<br>
peter.parrish@calsolareng.com</span><span style='font-size:10.0pt;font-family:
"Arial","sans-serif";color:blue'> </span><o:p></o:p></p>
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