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<DIV><FONT face=Arial>Morning Nick, and all---</FONT></DIV>
<DIV><FONT face=Arial></FONT> </DIV>
<DIV><FONT face=Arial>Best wishes for Peace on Earth , and congratulations for
the role we all play in that !</FONT></DIV>
<DIV><FONT face=Arial></FONT> </DIV>
<DIV><FONT face=Arial>When we were looking, back in the late 80's , for the best
caulks for roof penetrations and the occasional crack repair in our EPS
foam core covered with reinforced , latex modified, cement plaster, we used
silicones , polyurethanes, and the tri and quad polymer caulks like geocel 2300,
and OSI Quad.</FONT></DIV>
<DIV><FONT face=Arial> </FONT></DIV>
<DIV><FONT face=Arial>We like black silicone for roof penetrations in asplalt
shingles--clear silicones , and tri-polymers, are not UV resistant, black
lasts forever ,in our experience . Some folks teaching solar installation
have had very negative experience with clear silicone, and we concur. No UV
resistance ! Adhesion is not a strong point so be sure to place silicone in the
hole and under the foot/ bracket/whatever. That also prevents UV
exposure. Also be aware that there are different types of silicone, so do
some research. The RTV is probably best. Years ago we got our caulks from C R
Laurence Co, a major supplier to the glass trade. They had a great chart listing
all the caulks they sold, and their appropriate applications. </FONT></DIV>
<DIV><FONT face=Arial></FONT> </DIV>
<DIV><FONT face=Arial>When we needed caulk for high expansion use , like crack
repair , we tried polyurethane but found it to stiff --and messy--although it is
certainly sticky and tough. We then switched to the multi-polymers , using
Geocel and OSI Quad. We found the Geocel a bit to thin--may be different now--
but the OSI was just right. It is used and sold primarily for vinyl windows/
siding because it sticks tenaciously--even to polyethylene, which we used for 20
years for drainback SHW tanks. The tensile strength is affected by the presence
of color agents--it comes in over 200 colors or so. Clear is incredibly strong,
and extremely stretchy ! Lay out a bead, let it cure, and pull on it
.</FONT></DIV>
<DIV><FONT face=Arial>It can be very difficult to remove from surfaces. Great
for installing flashing to thermal collectors so removal for reroofing is not
needed. It does takes a while to cure.</FONT></DIV>
<DIV><FONT face=Arial></FONT> </DIV>
<DIV><FONT face=Arial>The tri-polymers will dissolve EPS foam, and react with
asphalt at the interface, leaving no bond, in our experience. But a little
keresene or your trusty can of penetrating oil is great for
cleanup.</FONT></DIV>
<DIV><FONT face=Arial></FONT> </DIV>
<DIV><FONT face=Arial>Caulk is a great tool, but selection of the appropriate
type, and application techniques is crucial. Experimentation will be most
useful.</FONT></DIV>
<DIV><FONT face=Arial></FONT> </DIV>
<DIV><FONT face=Arial>Take Care</FONT></DIV>
<DIV><FONT face=Arial>Ken Schaal</FONT></DIV>
<DIV><FONT face=Arial>CommonWealth Solar</FONT></DIV>
<DIV><FONT face=Arial><A
href="http://www.commonwealthsolar.com">www.commonwealthsolar.com</A>
</FONT></DIV>
<DIV><FONT face=Arial></FONT> </DIV>
<DIV><FONT face=Arial></FONT> </DIV>
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style="PADDING-RIGHT: 0px; PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: #000000 2px solid; MARGIN-RIGHT: 0px">
<DIV style="FONT: 10pt arial">----- Original Message ----- </DIV>
<DIV
style="BACKGROUND: #e4e4e4; FONT: 10pt arial; font-color: black"><B>From:</B>
<A title=william@millersolar.com href="mailto:william@millersolar.com">William
Miller</A> </DIV>
<DIV style="FONT: 10pt arial"><B>To:</B> <A
title=re-wrenches@lists.re-wrenches.org
href="mailto:re-wrenches@lists.re-wrenches.org">RE-wrenches</A> </DIV>
<DIV style="FONT: 10pt arial"><B>Sent:</B> Thursday, December 17, 2009 12:46
AM</DIV>
<DIV style="FONT: 10pt arial"><B>Subject:</B> Re: [RE-wrenches] Geocel
2300</DIV>
<DIV><BR></DIV><FONT size=3>Nick:<BR><BR>Read the fine print. Some of
these sealants are not recommended on asphalt roofing
products.<BR><BR>William<BR><BR><BR><BR>At 09:31 PM 12/16/2009, you wrote:<BR>
<BLOCKQUOTE class=cite cite="" type="cite">Aloha
wrenches:<BR> Do you have experience with Geocel
2300? What do you think of using it for roofing penetrations and roof
flashings? <BR> <BR>Nick Soleil<BR>Project Manager<BR>Advanced
Alternative Energy Solutions, LLC<BR>PO Box 657<BR>Petaluma, CA
94953<BR>Cell: 707-321-2937<BR>Office: 707-789-9537<BR>Fax:
707-769-9037<BR><BR><BR>_______________________________________________<BR>List
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<P></X-SIGSEP><U>Please note new e-mail address and domain:<BR><BR></U>William
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