I'm wondering if multiple 7" Unirac 2-piece Stand-Offs cylinders threaded together with all-thread would be a structurally sound solution. I'll pass that option by the engineers...
Still hoping for an off-the-shelf solution... J ason On Tue, Sep 10, 2013 at 4:38 PM, August Goers <aug...@luminalt.com> wrote: > Jason, > > > > It's funny that you bring this up because it is an issue that we > constantly face on commercial new construction. Commercial roofers want 8" > plus for their lead jacks plus the cricket often takes several inches above > the deck. > > > > Many folks in the Bay Area are using Hollaender rail fittings with > galvanized steel or aluminum pipe. The advantage is that you can cut the > pipe as long as needed. The entire setup is very robust but a bit costly. > Here's a link to various types of flanges they offer: > > > > http://www.hollaender.com/?page=flanges > > > > And here's a solar-specific link: > > > > http://solar.hollaender.com/ > > > > I'm looking forward to seeing if anyone else knows about off the shelf > longer stanchions. Unirac used to make custom longer lengths of their steel > standoff but no longer offer it. > > > > Best, > > > > August > > > > > > *August Goers* > > Luminalt Energy Corporation > > o: 415.641.4000 > > m: 415.559.1525 > > > > *From:* re-wrenches-boun...@lists.re-wrenches.org [mailto: > re-wrenches-boun...@lists.re-wrenches.org] *On Behalf Of *Jason Szumlanski > *Sent:* Tuesday, September 10, 2013 1:27 PM > *To:* RE-wrenches > *Subject:* [RE-wrenches] Flat Roof PV Attachments with Tapered Insulation > > > > Let me start be saying that I'm talking about mechanically attached > tilt-mount solutions capable of handling 172 mph design wind speed, ASCE > 7-10. Ballasted systems need not apply. > > > > We've used a variety of hardware for TPO membrane flat roofs, which is > becoming more and more popular around here. We've found that hardware bases > that mount on top of the membrane work well when there is a single slope in > the array area and the rails can follow the contours of the roof surface. > Ecofasten base plates spread the load out enough onto a DeskDeck roof board > or similar, and have proven to be pretty versatile. > > > > However, when you have center drains or other situations with multiple > slopes, it is advantageous to attach to the roof deck directly, typically > plywood here, particularly in new construction. Tapered insulation, > decking, and membrane can be cut around stand-offs and flashed nicely with > 8" TPO boots. This keeps rails parallel to the trusses/ground, and > disregards the roof membrane slope. The problem with this is that > insulation can easily get to be 6" thick, even on a small residential flat > roof, requiring a minimum 14" long stand-off to fit a standard TPO boot > above the membrane. > > > > Long story short, what mounting systems are others using for this > scenario, and who offers long stand-offs? > > > J > > ason Szumlanski > > Fafco Solar > > _______________________________________________ > List sponsored by Home Power magazine > > List Address: RE-wrenches@lists.re-wrenches.org > > Change email address & settings: > http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org > > List-Archive: > http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org > > List rules & etiquette: > www.re-wrenches.org/etiquette.htm > > Check out participant bios: > www.members.re-wrenches.org > > >
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