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Old 04-26-11, 12:36 PM   #10
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Yeah in order to reach the level of tightness and the lack of thermal bridging found in a passivehaus you really need new construction. To meet the standard you need no more than .6 ACH @ 50, which is pretty hard to do even in new construction much less in a retrofit. Although I think that you could get lower than 20% with a retrofit. I'm buying a house so we'll see, won't we?
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