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</o:shapelayout></xml><![endif]--></head><body lang=EN-US link=blue vlink=purple><div class=WordSection1><p class=MsoNormal>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.<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>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 <a href="http://roof-tech.us/">http://roof-tech.us/</a> . 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.<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>Maybe consider this a Poll: (to flash, or not to flash) <o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>With Regards,<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>Daniel Young, <o:p></o:p></p><p class=MsoNormal>NABCEP Certified PV Installation Professional<sup>TM</sup>: Cert #031508-90<o:p></o:p></p></div></body></html>