What is the best way to super insulate the exterior of our 1975 four level split home?
...inches apart top to bottom on the exterior. Then on top of that put vertical 1 by 2 strapping screwing this strapping into the vertical house studs (and through the newly installed horizontal strapping).
Then spray closed cell foam about 1 inch thick against the original siding. This would leave about a 1 inch air gap ...