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

[Jesse Dahl]

We've always had ours made by a local shop to fit the roof. I can't say I've ever looked for an "off to shelf" solution. 

Jesse

Sent from my iPhone

On Sep 11, 2013, at 9:13 AM, "Garrison Riegel" <garrison at solarserviceinc.com> wrote:

> Schletter makes their 2” diameter aluminum stanchions in a variety of sizes, up to 12”.  We have done a number of jobs on the exact roof you are describing using the attached version of the Schletter Windsafe.  Their stanchion has a pretty small base with 4 holes for attachment, like the UniRac, so we always lag them into structural framing or blocking. 
>  
> Ironridge also has a nice attached tilt up solution for a single module rows, but last time I checked the lead time on their 12” standoff was 6 weeks.
>  
> When we need heights over 12” we have a local fab shop make them for us.
>  
> Windsafe spec:
> http://www.schletter.us/support/Windsafe_Product_Sheet.pdf
>  
> Stanchions on page 9:
> http://www.schletter.us/support/I400003%20Component_OV.pdf
>  
> Best
>  
> Garrison Riegel
> Project Manager | Solar Service Inc
> [p] 847-677-0950 | garrison at solarserviceinc.com
>  
> NABCEP Certified PV Installation Professional™
>  
> 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 4:03 PM
> To: RE-wrenches
> Subject: Re: [RE-wrenches] Flat Roof PV Attachments with Tapered Insulation
>  
> 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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