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Are the calculation procedures fully harmonised?

To support the open EU market, more and more standards have been prepared as ENӳ. For building products this is even a requirement based on EU mandates to CEN according to the EU-CPD (Construction Product Directive). To stimulate an open...
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What are these and where can one find updated information on the infringement procedure regarding EPBD?

Details and full Information on infringement procedures can be found here: ec.europa.eu/dgs/energy_transport/infringements/index_en.htm For specific information regarding infringement procedures in relation to the EPBD (2002/0091),...
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What is the present status and where can one find updated information about this revision process?

Information on the recasting technique by the European Commission is available here: http://ec.europa.eu/governance/better_regulation/codif_recast_en.htm For information on the main problems, main policy objectives, and policy options,...
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Can the calculation method for the overall transmission and ventilation heat loss coefficients, which is presented in EN ISO 137

Yes, but some of the required input data may not be available at reasonable costs. For those cases default values may be provided at national level, e.g. as function of type and age of construction. Question submitted by: Dick van Dijk (...
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Many CEN-standards are ISO-standards, e.g. EN ISO 13790, 6946, 10077 and 14683. How can these standards make reference to the se

If an ISO (International Organization for Standardization) standard is also an EN ISO standard, then it is a European standard just like any other EN (European) standard. As illustrated in several CENSE Information Papers, e.g. P92 or P94...
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why was the term “heat transfer” introduced instead of “heat loss” in the CEN standards to support the EPBD?

Heat is lost from a building or building part by transmission or ventilation, as a result of a positive temperature difference between the indoor and outdoor (or other) environment. However, if the indoor temperature of the considered...
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Does the airtightness depend on construction type?

Measurements usually show that light (e.g., timber-frame or steel) constructions are leakier than massive construction, but this is not bound to be. In fact, PassivHaus houses are often light constructions and are very airtight. The...
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What is the effect (extent) of the aging process in the airtightness performance?

There is little information on the subject at the moment. A study referenced in a paper written by Erhorn et al. and presented at the 2008 AIVC conference shows airtightness values of 31 “Passivhaus” houses at commissioning and 2 years...
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How is a pressurisation test performed on single apartments?

The airtightness measurement of single apartments is usually performed the same way as in individual houses. Therefore, there is no specific protocol to balance the pressure between the apartment under test and other apartments. Different...
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How do you measure the airtightness of multi-family buildings?

Measuring or evaluating the airtightness of multi-family buildings is challenging as there may be technical and practical difficulties that prevent from pressurizing the whole building. These difficulties include for instance building...
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Why are there different indicators (n50, q50, w50, etc.)?

Now in Europe, many countries have adopted the n50 value (i.e., the leakage flow divided by the volume) for their EP regulation while others (e.g., Belgium, France, UK) use the envelope area normalisation. The rationale behind this latter...
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Is it possible to compare airtightness measurements between the Member States?

To some extent yes. A collection and analysis of some data collected through the ASIEPI partners has been presented at the 2008 BlowerDoor conference (Papaglastra et al., 2008). However, caution should be exercised when comparing...
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How do you deal with envelope airtightness value in energy losses calculation?

There are three major ways to estimate this impact: - the simplest is to evaluate the infiltration losses based on a rule of thumb established by Drubul in 1988 (*) and suggested by Kronvall (**) in 1978. The rule says that the...
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What is the energy impact of envelope leakage?

Energy wastage due to envelope leakage has been estimated in various countries through numerical simulations: - in Belgium and in Germany, the energy impact has been calculated to be about 10% of the energy performance level for individual...
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Is ductwork airtightness good in the Member States?

The SAVE-DUCT project has shown that there are large discrepancies between countries on this subject (the project report is available through AIVC at www.aivc.org). Analyses performed on measurements results have shown that Belgian and...
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What are the minimum requirements regarding airtightness for low-energy buildings?

To our knowledge, only two low-energy labels include a minimum requirement for low-energy buildings: - the PassivHaus standard (www.passivhaus.de) that requires an airtightness better than 0.6 air changes per hour at 50 Pa (n50 <= 0.6...
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Is there a database to see which levels of airtightness are compulsory in EU MS, or guidelines?

There is no up-to-date document at this time. Anwered by: Rémi Carrié and Gaëlle Guyot (CETE de Lyon) Date: 2008/12/12
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Is there a certification process for the pressurisation test technicians?

There exists a certification scheme in Germany which is not compulsory to perform tests. There exists a compulsory authorisation process in France for technicians who perform test on BBC-Effinergie buildings. To our knowledge, there is no...
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Are there countries where airtightness testing is compulsory?

To our knowledge, the UK is the only country that has made testing mandatory. This has been in force since 2002 for large buildings and extended to most buildings in 2006. Anwered by: Rémi Carrié and Gaëlle Guyot (CETE de Lyon) Date: 2008...
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Are the methods validated, which are offered for the calculation of energy needs in EN ISO 13790?

The monthly method and the simple hourly method were indeed validated by comparison to detailed calculations and to the actual energy use of several buildings (monthly values). The monthly method for heating has been in use since 1990. (...