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<DIV>Thanks Jeremy, but I think my question is different than how you may have interpreted it. I'm wondering why does the article</DIV>
<DIV> recommend changing both the U-EFFECTIVE and the ficticious material.</DIV>
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<DIV>The article says in one place that the heat transfer, Q = [U-EFFECTIVE]*A(Tg - Ti). Then, it later says, as you quoted, "The </DIV>
<DIV>fictitious insulating layer is required to give the correct effective resistance for the construction..."</DIV>
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<DIV>So which is it??? Is there some sort of heat balance that needs to happen with the two? Does the ficticious layer somehow</DIV>
<DIV> influence the weighting factors even though it has no mass???</DIV>
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<DIV>-Eric</DIV></BODY></HTML>