Not that the names of things matter that much but imho "flashing" does require an overlapping of some kind. An Oatey boot for a metal roof is more of a bedded fitting than a flashing. It relies entirely on fasteners and a sealing membrane whereas flashings rely mostly on natural forces like gravity. Perhaps an experienced roofer weigh in on this.
Kurt Johnsen On Fri, Aug 7, 2015 at 3:21 PM, Jason Szumlanski < ja...@floridasolardesigngroup.com> wrote: > "If you place a flat object on top of roofing without an uphill material > lapping over the downhill object, you are not flashing. " > > By that logic, an Oatey boot is not a flashing for a plumbing vent on a > metal roof. > > Just sayin'... > > > Jason Szumlanski > > > On Fri, Aug 7, 2015 at 2:19 PM, William Miller < > william.mil...@millersolar.com> wrote: > >> Ray: >> >> >> >> I have to respectfully disagree with your semantics. A flashing is an >> overlapping of roofing materials such that gravity will direct rain and >> melt water off of the roof. This is a universally accepted waterproofing >> method that does not depend on any sealant material. The concept is as >> ancient as the first, crude, thatched roof. >> >> >> >> If you place a flat object on top of roofing without an uphill material >> lapping over the downhill object, you are not flashing. >> >> >> >> What you have described is sealant-dependent weatherproofing. Regardless >> of the quality of the sealant, or lack thereof, I don’t think you can call >> it a flashed attachment. >> >> >> >> (The overarching point is a flashed attachment does not depend on a >> sealant. Any sealant has a finite lifespan. Removing the sealant variable >> from the equation results in more lasting installation.) >> >> Sincerely, >> >> >> >> William Miller >> >> >> >> >> >> [image: Gradient Cap_mini] >> Lic 773985 >> millersolar.com <http://www.millersolar.com/> >> 805-438-5600 >> >> >> >> *From:* RE-wrenches [mailto:re-wrenches-boun...@lists.re-wrenches.org] *On >> Behalf Of *Ray Walters >> *Sent:* Friday, August 07, 2015 10:34 AM >> *To:* RE-wrenches >> *Subject:* Re: [RE-wrenches] to flash or not to flash >> >> >> >> My opinion is that if the L foot has enough surface area it constitutes a >> flashing, and that large flashings can actually cause more damage to the >> roof than they prevent. >> I also agree that an attachement doesn't constitute a penetration. I >> just finished an install on a metal roof with hundreds of screw holes. We >> added a few more screw holes, and ours have 20 times the sealant surface >> area. We did run a 1" conduit through the roof, and since it was an actual >> penetration, we used a very expensive flexible boot flashing. >> Personally, I think we need about a 3"x3" or 4" x 4" L foot with a double >> stick butyl tape on the bottom, and all will be well. >> I realize that the OP was referring to asphalt, but I will flash other >> roof types that don't do well with L feet ( like shake). >> >> >> >> _______________________________________________ >> 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 >> >> >> > > _______________________________________________ > 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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