Daniel: Good question, and worthy of revisiting.
As a contractor and businessman, I am obligated to reduce risk exposure by using best evolved practices. This requires I used modern, purpose-built, approved attachment hardware. To my knowledge, these are all flashed. No roofing contractor will honor a warranty on sealant-only attachments. On pitched roofs, gravity is the main factor in shedding rain water and flashed systems accomplish this. Thanks for bringing this up. William > On Aug 6, 2015, at 9:47 AM, Daniel Young <dyo...@dovetailsolar.com> wrote: > > Writing the subject above, it seems like I’ve heard this question on the > wrench list before, but I could not find it in my old email archives. Feel > free to pint me back to the old discussion if it’s there. > > I’ve been using a flashing based roof attachment for 8+yrs now (quick mount > or similar). Now we are looking at Rail-less systems (quick rack is a good > example). There is also a non-flashed rail-less racking from roof-tech > http://roof-tech.us/ . I’ve always been of the opinion that simply crushing > some sealant/gasket onto an asphalt shingle work fine at first (the test data > from roof-tech is impressive), but would be an issue 10+yrs down the road > (thermal expansion movement, freeze/thaw, etc). I can make a good waterproof > seal at first by just slathering some butyl/silicone to an L-foot and > cranking it down on the shingles, but that practice really disappeared 8+yrs > ago. > > Maybe consider this a Poll: (to flash, or not to flash) > > With Regards, > > Daniel Young, > NABCEP Certified PV Installation ProfessionalTM: Cert #031508-90 > _______________________________________________ > List sponsored by Redwood Alliance > > List Address: RE-wrenches@lists.re-wrenches.org > > Change listserver email address & settings: > http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org > > List-Archive: > http://www.mail-archive.com/re-wrenches@lists.re-wrenches.org/maillist.html > > List rules & etiquette: > www.re-wrenches.org/etiquette.htm > > Check out or update participant bios: > www.members.re-wrenches.org >
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