Good Folks,
We did a job on Hunter panels - which are even
worse than SIPS because they have no lumber at
the edges in the rafter orientation like SIPS do.
We used the large surface area mounts like
Ecofasten or Rapid Foot thare intended for metal
roofs and instead modified them to work with SIPS
by changing the screw lengths and patterns.
We used EcoFasten's products:
http://www.ecofastensolar.com/our-products/eco-fasten
You could also use UNIRACs rapid foot or
equivalent. We then customized the screw pattern
such that every other screw was a short or long
one - the short ones going into the top sheathing
and the long ones going into the base sheathing
(and/or rafters if you need to) that the Hunter
or SIP sits on.
We also then made sure to install long screws
that go down into the lower sheathing underneath
the steel plate of the ecofasten - that way the
compression force is transferred below. And then
more long screws aboveand through the plate. You
can even plan to hit rafters below if you really
plan ahead or do it during new construction.
You have to do the calcs on what the foam can
handle for psi and what uplift you need, etc.
Bring in an engineer on this.
We used 30"' centers - it's very expensive - but
the idea is to distribute the weight - kind of
like an S5 approach. We had an engineer do the
calcs.
Best of luck!
Send $ to Haiti,
Jeff C.
Alan,
Thanks for the correction, I did in fact
use the blue 'roof grip screws' with neopreme
washers provided by DP&W for use in OSB. I
better go chug more Ginko.
Bill
Feather River Solar Electric
4291 Nelson St.
Taylorsville, CA 95983
----- Original Message -----
From: <mailto:[email protected]>Allan Sindelar
To: <mailto:[email protected]>RE-wrenches
Sent: Sunday, January 17, 2010 10:46 PM
Subject: Re: [RE-wrenches] Mounting to SIPs, revisited
Just a note of caution here: "Tech" screws are
"Tek" screws, which are essentially a sheet
metal thread following a pilot drill point, on a
hardened shank. They are intended for mounting
only into metal, not wood; the drill point isn't
designed to self-pilot into wood, and the drill
section is too large in diameter for wood.
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Allan Sindelar
<mailto:[email protected]>[email protected]
NABCEP Certified Photovoltaic Installer
EE98J Journeyman Electrician
Positive Energy, Inc.
3201 Calle Marie
Santa Fe, New Mexico 87507
505 424-1112
<http://www.positiveenergysolar.com/>www.positiveenergysolar.com
frenergy wrote:
Luke,
Direct Power and Water has an optional
mounting foot with five holes in it for what I
think Jeff Randall there referred to as 'Tech'
screws to use in the field between rafters. They
are referred to as 'easy feet'. It is designed
to only attach into the roof decking, which I'm
pretty sure only required 1/2" OSB. He claims
the same or better pullout values as one lag per
regular foot...there may also be tighter spacing
involved for the feet. The choices are 1 1/2"
or 3" long, has a self tapping point so no
pre-drill. Add some of the peel and stick
mastic and it's a fast install.
Bill
Feather River Solar Electric
4291 Nelson St.
Taylorsville, CA 95983
----- Original Message -----
From: <mailto:[email protected]>Luke Christy
To:
<mailto:[email protected]>[email protected]
Sent: Sunday, January 17, 2010 8:24 PM
Subject: [RE-wrenches] Mounting to SIPs, revisited
Esteemed Wrenches,
We have a PV job in the works that will require
mounting racking to several roofs that consist
of asphalt shingles laid over SIP panels. The
panels are standard 10" nominal thickness, with
9-1/4" of foam sandwiched by 1/2 OSB on each
side. The rub is that the underside of the
panels will be the finished ceiling (with 5/8"
of wood over the OSB).
I found a couple of threads in the archives
discussing mounting to SIPs, but most comments
suggest through-bolting, and that is not an
attractive option in this case due to the
finished ceiling directly beneath.
The roofs in question are triangular in plan,
and are fairly small (~ 15' x 15' x 21')
Does anyone have experience with mounting
directly to the outer skin of a SIP panel?
Suggestions on the best way to approach this problem would be appreciated.
Thanks in advance.
Luke Christy
NABCEP Certified PV InstallerĀ: Certification #031409-25 (Luke Christy)
CoSEIA Certified PV Installer (Luke Christy)
Solar Gain Services, LLC
Monte Vista, CO
<mailto:[email protected]>[email protected]
719.588.3044
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Senior Design Engineer
NABCEP (tm) Certified Solar PV Installer
http://www.nabcep.org/
Village Power Design
Solar Design Consultation for the Commercial Sector
http://www.villagepower.com
[email protected]
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