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

[Aladdin Solar]

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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