Morning Nick, and all---
Best wishes for Peace on Earth , and congratulations for the role we all play
in that !
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.
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.
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 .
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.
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.
Caulk is a great tool, but selection of the appropriate type, and application
techniques is crucial. Experimentation will be most useful.
Take Care
Ken Schaal
CommonWealth Solar
www.commonwealthsolar.com
----- Original Message -----
From: William Miller
To: RE-wrenches
Sent: Thursday, December 17, 2009 12:46 AM
Subject: Re: [RE-wrenches] Geocel 2300
Nick:
Read the fine print. Some of these sealants are not recommended on asphalt
roofing products.
William
At 09:31 PM 12/16/2009, you wrote:
Aloha wrenches:
Do you have experience with Geocel 2300? What do you think of using it
for roofing penetrations and roof flashings?
Nick Soleil
Project Manager
Advanced Alternative Energy Solutions, LLC
PO Box 657
Petaluma, CA 94953
Cell: 707-321-2937
Office: 707-789-9537
Fax: 707-769-9037
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