Any of the good (read metal) vents have nice flappers which seal up well. Here home cheapo and the like don't carry them. I have to go to a lumber yard or HVAC store to get them.
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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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