[RE-wrenches] Flat Roof PV Attachments with Tapered Insulation

Jason Szumlanski jason at fafcosolar.com
Tue Sep 10 14:02:53 PDT 2013


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 <august at 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-bounces at lists.re-wrenches.org [mailto:
> re-wrenches-bounces at 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
>
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