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

[Garrison Riegel]

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 |  <http://www.solarserviceinc.com/> Solar Service Inc

[p] 847-677-0950 |  <mailto:garrison at solarserviceinc.com>
garrison at solarserviceinc.com

 

NABCEP Certified PV Installation ProfessionalT

 

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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