The last time I used Geocel--many years ago-- it reacted with asphalt
negatively.
I find it hard to beat plain black silicone to seal lags and bolts, especially
when under compression. Lasts forever !
Well, looks like new even after 30+ years.
Perhaps the current Geocel is a different formulation---------
Ken Schaal---an old solar thermal wrench-- first install in '76
CommonWealth Solar
----- Original Message -----
From: Aladdin Solar
To: August Goers ; RE-wrenches
Sent: Wednesday, July 14, 2010 3:06 PM
Subject: Re: [RE-wrenches] Best practices for mounting on cedar shake roof?
We've thought about those 18" QuickMounts but since there are often large
gaps and splits in the shakes that there still would be plenty of opportunity
for wind and ice to drive moisture up to the point where the lag screw is
located, only a few inches above the lowest point of the flashing. I trust the
12" QuickMounts for composition roofs because they compress the shingle and
help make a good seal around the penetration (with added Geocell). With shakes
it doesn't seem you can have the same sort of confidence since the shakes are
porous and subject to expanding, contracting, splitting, swelling, etc.
--Charlie
----- Original Message -----
From: August Goers
To: Aladdin Solar ; RE-wrenches
Sent: Wednesday, July 14, 2010 1:27 PM
Subject: RE: [RE-wrenches] Best practices for mounting on cedar shake roof?
We've used the big 18" x 18" Quickmounts with good results.
http://www.quickmountpv.com/products/shake-mount.html
-August
From: [email protected]
[mailto:[email protected]] On Behalf Of Aladdin Solar
Sent: Wednesday, July 14, 2010 10:01 AM
To: [email protected]
Subject: [RE-wrenches] Best practices for mounting on cedar shake roof?
Is it possible to do a weather-tight install on a cedar (or other) shake
roof in snow country with wide temperature and moisture ranges? We usually use
QuickMount or SnapNRack flashed mounting points on composition roofs. I can't
imagine a really reliable way to go through cedar shakes and keep moisture out
of the penetration.
--Charlie
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