People put vapor impermeable materials on the sheathing of their houses all the time. You just need to make sure the wall can dry to the inside. You can spray foam on the T1-11 but the cost effectiveness may not make sense. That stuff is by far the most expensive of the common insulations and, I hate to say it, is easily botched. Do you have existing wall insulation? You can assume somewhere around 20%, or maybe a little less, of your wall is framing lumber.
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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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