Wall assembly zone 6 – GreenBuildingAdvisor

I’m building a house in Wisconsin. Contractor typically uses spray foam. I’m vehemently against spray foam so looking at different wall assemblies and getting a bit confused. We are using hardie siding and likely some masonry on the front.

i was originally wanting double stud walls but seems like overkill.  Now looking at Outsulation. Siding, rain screen, foam insulation?rockwool boards?/ blue wrap, plywood sheathing/ rockwool bats and dry wall. 

im understanding you don’t need a vapor barrier on the inside so wall can dry to protect he inside? Could also consider intello.

firstly do we need the foam on the outside at all? If so-

what is the best insulation for the outside of this assembly that wont lose R value and also wont cause condensation? do we need the inner vapor layer? 

thank you!

RIK