I've been looking for guidelines on framing of a 6' rough opening. A couple contractors I've talked with seem to think it's ok to widen a 5' 10" rough opening by either removing one trimmer/jack stud 2x4 on either side, and replacing it with a 1x4 board. According to the International Residential Code (IRC 2009), for a ground snow load of 50 psf, which is specified by Minnesota State Building Code, regardless of the building width, at least two jack studs are required for each end.
The free online IRC isn't searchable, so the code finder from This Old House is useful.
This is problematic. Perhaps I should consult a structural engineer regarding the engineering margin.
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