[RE-wrenches] to flash or not to flash

[William Miller]

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 <dyoung at 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
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