[RE-wrenches] The perfect solar ready roof

[Chris Daum]

Jim:
 
See, that is my contention.  I am thinking of adding another 1/2" (or
perhaps 3/4") of plywood over the entire roof; I just don't think that
lagging into those fakey I-beams is meaty enough (this is a high wind area).
If I have another well-attached layer, then I can lag into the roof pretty
much everywhere.
 
And building inspector?  They are sort of a joke around here.  We refer to
it sometimes as the state of Montucky.....
 
Chris Daum
Oasis Montana Inc.

  _____  

From: re-wrenches-bounces at lists.re-wrenches.org
[mailto:re-wrenches-bounces at lists.re-wrenches.org] On Behalf Of North Texas
Renewable Energy Inc
Sent: Wednesday, October 20, 2010 7:52 AM
To: RE-wrenches
Subject: Re: [RE-wrenches] The perfect solar ready roof


Chris
You would need to use something like the Unirac Fast foot to attach your PV
standoffs. Fast foot uses multiple smaller gauge screws into the decking,
necessary since engineered beams are not able to provide the 4-5 inches of
solid wood needed for traditional lag bolts. The engineered beams you speak
of, while rigid light-weight and cost-competitive with dimension lumber, are
usually recommended for joists or floor beams though not usually used for
rafters. 
I'm curious, how did the homeowner get 1/2 inch decking past the building
inspector? 
 
Jim Duncan
North Texas Renewable Energy
486 W.N. Woody Road
Azle Texas 76020
NABCEP Certified Solar PV
Installer No.31310-57
TECL 27398
ntrei at 1scom.net 
817.917.0527
www.ntrei.com <http://www.ntrei.com/> 
 
 

-----Original Message-----
From: re-wrenches-bounces at lists.re-wrenches.org
[mailto:re-wrenches-bounces at lists.re-wrenches.org]On Behalf Of Chris Daum
Sent: Tuesday, October 19, 2010 9:58 PM
To: 'RE-wrenches'
Subject: [RE-wrenches] The perfect solar ready roof


Dear Wrenches:
 
I have a composite (shingle) roof at hand, and the owner wants to upgrade it
to a metal roof and install a 5kw+ array on it.   The rafters are those
(sort of) particle board I-beams covered with 1/2" plywood (and shingles).
What's the best metal roofing you could suggest--and would you beef up the
wood to lag into?
 
Thanks for all your input.
 

Chris Daum
Oasis Montana Inc.
406-777-4309 
406-777-0830 fax

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