Honesty I'm not sure what you're getting at here.
Insulating a basement wall from the outside is always the best. If you insulate you have to worry about where the dew point is going to be. Concrete is basically vapor impermeable. You will have mold growth between your insulation and the wall. You need to be very vigilant about sealing the foam and making sure that there are no existing moisture issues. Outsulating a wall is labor intensive though. You need to dig and plant XPS and then cover and exposed foam with stucco or something to protect it from sun and weed whackers and the like. You could probably get away with just planting it 2' deep or so. Maybe just use 4' x 8' sheets on their sides. I plan on doing this here before next winter. But how are you going to get R 40? XPS is R5 / inch. That's 8" of foam.
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My project:
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Chipping away on a daily basis.
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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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