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: [email protected] > > 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 >
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