[RE-wrenches] Best practices for mounting on cedar shake roof?

[Ken Schaal]

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: re-wrenches-bounces at lists.re-wrenches.org [mailto:re-wrenches-bounces at lists.re-wrenches.org] On Behalf Of Aladdin Solar
    Sent: Wednesday, July 14, 2010 10:01 AM
    To: re-wrenches at lists.re-wrenches.org
    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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