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-boun...@lists.re-wrenches.org [mailto:re-wrenches-boun...@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 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 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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