Jim:
Your comment is very timely and apropos! Talked with the architect this
morning about this as a possible solution. Since the SIPs are being
custom manufactured, they can embed the "ribs" as you described. That's
great for this project, but adding PV as a retrofit on an existing SIP
roof will be a challenge.
Other Wrenches: Thanks so much for your helpful comments and suggestions!
Regards,
Gary Willett, PE
g...@icarussolarservices.com <mailto:g...@icarussolarservices.com>
On 7/26/2011 10:45 PM, North Texas Renewable Energy Inc wrote:
Seems as though a motivated Architect could order custom SIP panels
with dimensioned lumber ribs attached on the inside surface of the
exterior roof panel. It would allow for NS rows of attachments without
puncturing the envelope.
We priced SIP construction years ago and found that mfgrs can build
virtually _any_ wall or roof panel configuration the design requires.
All it takes is more money.
That's why we ended up with 2x6 with spray foam shell.
*Jim Duncan*
*North Texas Renewable Energy*
*NABCEP Certified Solar PV*
*Installer No.031310-57*
*TECL 27398*
*nt...@1scom.net* <mailto:nt...@1scom.net>**
*817.917.0527*
*www.ntrei.com* <http://www.ntrei.com/>
**
-----Original Message-----
*From:* re-wrenches-boun...@lists.re-wrenches.org
[mailto:re-wrenches-boun...@lists.re-wrenches.org]*On Behalf Of *R
Ray Walters
*Sent:* Tuesday, July 26, 2011 1:49 PM
*To:* g...@icarussolarservices.com; RE-wrenches
*Subject:* Re: [RE-wrenches] Module Racking Attachment to SIP Roof
One problem that came up on a project recently, is that your
penetrations (as proposed in your solution below) will essentially
ruin the thermal performance of the SIPs system.
The whole point of the SIPs system is that there are no thermal
short circuits such as framing members that allow heat to be
transmitted around all that insulation.
The project I was referring to was with NREL, and a smart engineer
caught it, and forced the PV contractor to mount in a way without
penetrations.
I also work with very savvy architects that are now specifying
minimal penetrations through the thermal envelope.
I'd suggest a standing seam roof, with S5 clamps. Ask the roofer
to use extra attachment screws, if you're worried.
R. Walters
r...@solarray.com <mailto:r...@solarray.com>
Solar Engineer
One solution could be a product that had a bolt-plate on the
bottom of the SIP, that penetrates the SIP with long 5/16"
threaded bolt(s), and then attaching to the PV mount at the top
of the SIP. The UniRac SolarMount steel flat-top mount has four
5/16" bolt-holes and might be a good choice. This method should
have no problem achieving the required pull-out resistance.
Any suggestions, installation experience, on how to put PV on a
SIP roof?
--
Regards,
Gary Willett, PE
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