Rim board as headers. – GreenBuildingAdvisor

I appreciate any help and advice in advance. I have 2 questions 

1) in zone 6a, is it a good or bad idea to frame a 2 story home with 2×4, diligent air seal and r10 continuous exterior insulation? Considering it is a spec home.

2) is it a good idea to use the rim joist for headers for all openings to add better insulation? Is it more or less costly as well? ( I guess 3 questions).

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