[kach22i]

Getting condensation or dew point on the outside of the wall sheathing of lieu of inside of it (inside the batt) can do a lot for comfort levels and reducing the risk of mold.

2-layers of staggered 1/2" rigid insulation on the outside of the house (taped and sealed) is the way to go according to a green energy house tour I took a while back.

This was for a 2x4 wall existing house to outperform new 2x6 construction.

This home owner actually found old Iso roof insulation 1" thick (recycled it - saved from dumpster) and was using 2-layers of it.