Best insulation combination for a 2×8 wall?
hello have a question building a home in zone 5 , exterior wall of house is 2×8 with zip sheathing taped
was hoping to get R30 + from the wall using a combination of interior and exterior insulation
1) with zip sheathing do i still need and exterior membrane ?
2) interior insulation was planing on using fiber glass or maybe go up to mineral wool
3) exterior insulation because of zip do I still have to worry about vapor permeability , was looking at using xps or mineral wool on exterior what would be the better combination
4) planing on using fiber cement panels on exterior
hope to get advise on building the best combination
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