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Treatment of envelope airtightness in the EPB-regulations: some results of surveys of the IEE-ASIEPI project

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This paper was presented at Buildair conference, held in Berlin, Germany, in October 2009. Based on an instrument developed within ASIEPI to compare the energy performance requirement levels among the Member States, this paper illustrates that the different way envelope airtightness is dealt with in the EPB-regulations and in the EPB-calculation of the Member States can reveal sometimes diverging underlying philosophies. Notably the concept and numeric figures of a default value are different, as well as the treatment of very good airtightness: in some methods the stimulus to do better than a certain threshold value becomes very small or is nil. In other countries, the incentive remains proportional all the way to the limit value of perfect air tightness.