What is the best way to super insulate the exterior of our 1975 four level split home?
...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 behind the newly installed permane...