What is the best way to insulate a 2x4 wall from the outside in a cold climate?
...options, and i am unsure of best path to follow:
1. Remove existing plywood and cavity insulation, spray foam cavities from outside in, reinstall plywood (might be some air gaps behind plywood), add tyvek drainwrap wrb, then add 2" polyiso enerair, 1" strapping, siding.
2. Remove existing plywood and cavity insulation ...