I'm in the very early stages of a house design and planing wall insulation 2x6" on 24 center with 2" closed cell foam an fill with cellulose. I am thinking of Roxul 1.5" on outside. on the inside I am considering 2 options. 1, foil then horizontal 2x2s then Sheetrock. 2, rockwool 1.5" then Sheetrock. any thoughts?