"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 > > >
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