Kris has a good idea. Installing 2x backer blocks on the I-joists will not only give you more depth for your lag screws, but it will strengthen the roof framing as well. Also, as Kris recommends, check with the manufacturer for nailing patterns, etc. I was dealing with some BCI joists this past summer and I was pleased that Boise Cascade has structural engineers on staff that are eager to help, and can email you approved drawings for reinforcing the joists. -Hans
_____ From: re-wrenches-boun...@lists.re-wrenches.org [mailto:re-wrenches-boun...@lists.re-wrenches.org] On Behalf Of Kristopher Schmid Sent: Wednesday, October 20, 2010 1:33 PM To: 'RE-wrenches' Subject: Re: [RE-wrenches] The perfect solar ready roof What about screwing in double 2x6s flush to the roof deck between the beams where your feet will attach and lag bolting into that? Definitely check with the beam manufacturer first, though. Kris Legacy Solar 864 Clam Falls Trail Frederic, WI 54837 715-653-4295 sol...@legacysolar.com www.legacysolar.com -----Original Message----- From: re-wrenches-boun...@lists.re-wrenches.org [mailto:re-wrenches-boun...@lists.re-wrenches.org] On Behalf Of Scott McCalmont Sent: Wednesday, October 20, 2010 12:00 AM To: RE-wrenches Subject: Re: [RE-wrenches] The perfect solar ready roof In general, you shouldn't drill or cut the flanges on engineered wood beams. I think that eliminates lag screws into the rafters. They probably wouldn't have the same pull-out strength as a lag screw into a conventional rafter, either. Scott On Oct 19, 2010, at 7:58 PM, Chris Daum wrote: 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 _______________________________________________ List sponsored by Home Power magazine List Address: RE-wrenches@lists.re-wrenches.org Options & settings: http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org List-Archive: http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org List rules & etiquette: www.re-wrenches.org/etiquette.htm Check out participant bios: www.members.re-wrenches.org <http://www.members.re-wrenches.org/>
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