A couple extremely important things to remember when making a double wall in a retrofit: You will still have band joist issues. If you have decent replacement windows you will still have more air leakage through the band joist than in all windows combined (usually). Also there is the enormous thermal bridging issue there as it a band of 8"-10" wood wrapping the house on all sides. You also have one of these under the first floor which brings along the same kind of air leakage and thermal bridging issues. This is one of the main reasons that outsulating has become so popular. It's dead easy in a retrofit. To properly insulate and air seal in a retrofit from the inside you would need go gut the house. Or at least gut one part of the house at a time.
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You know you're an ecorenovator if anything worth insulating is worth superinsulating.
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S-F: "What happens when you slam the door on a really tight house? Do the basement windows blow out?"
Green Building Guru: "You can't slam the door on a really tight house. You have to work to pull it shut."
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