What is the best way to insulate a 2x4 wall from the outside in a cold climate?
...vapor barrier. Install rockwool batt insulation with NO vapor barrier (to allow drying inwards), reinstall plywood , install peel and stick wrb/air seal, then add 4" comfortboard rockwool, then 1" strapping, siding.
3. Leave existing wall assembly alone, install peel and stick wrb, then add 4" comfortboard, then 1" str...