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A conference of the
Energie- und Umweltzentrum
am Deister GmbH


12th International BUILDAIR Symposium

Airtight Buildings, Thermography and Ventilation Systems in Practice

June 25-26, 2021
Bilingual online conference

Around 135 colleagues we welcomed from Austria, the Czech Republic, Denmark, France, Germany, Ireland, Latvia, Luxembourg, Norway, Serbia, Switzerland and the USA to the 12th International BUILDAIR Symposium - thank you all very much for your participation. We are aware that an online conference is very exhausting. We appreciate that you stayed the two days from morning to late afternoon and actively participated with questions and comments about the presentations.

During his opening speech, Wilfried Walther asked how many kilometers you did not cover this time between your hometown and Hanover in view of the online event. In a few minutes, we received 46 responses via chat, which added up to a whopping 48,212 kilometers. Extrapolated to all participants, we have saved more than 140,000 kilometers - an impressive number!

We were pleased that many of you visited the BuildairLounge and even arranged to meet there. We will continue to use this format, also between the symposia and regardless of whether a virus imposes contact restrictions on us or not. When the ideas are concrete, you'll be the first to know.

Thank you very much for the spontaneous feedback, it is motivating to hear that you can use the impulses and information directly when working on your current projects and tasks. With your certificate of attendance you will receive the links to the usual questionnaires - one about the symposium as a whole and one about the presentations. Your answers will help us to prepare the next symposium so that you can benefit from it again.

It will take place in 2023, as soon as the exact date has been set, it will be announced here. We are already looking forward to welcoming you - hopefully again in Hanover. In 2023 the symposium will be 30 years old, we hope you will celebrate the anniversary with us.

All the best to you, have a successful time and stay healthy!

Thanks a lot to the sponsors

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to the co-operation partners 

aivc_logo.gif DEN-eV_Farbe_Web.jpg FLiB.jpg Logo_GIH.png
ig_logo.jpg Logo_PHI_neu_DE.jpg Tightvent-ohne.jpg Logo_VATH_RGB_bearb.png

and to the media partners

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tab_Logo.png TGA-Logo_kompr.jpg      


Friday, June 25

All times refer to Central European Summer Time


Wilfried Walther, D
Session 1: From Associations and Organizations

Country reports
Oliver Solcher (D), Michael Wehrli (CH), Lars Due (DK), Jiří Novàk (CZ), Gavin O'Se (IRL), Andrejs Nitijevskis (Baltic Countries)

Statistical analyses of about 420,000 measurements of the French database of building airtightness
Bassam Moujalled, F

FLiB- Qualification: Training for tradesmen – Airtight sealing
Wilfried Walther, D
11:15  Coffee break / BuildairLounge
Session 2: Gluing and sealing on site

Damaged timber girders due to negative pressurization – root causes and action plans
Thomas Runzheimer, D

Effizient and safe execution of difficult air seal joints – liquid adhesive
Michael Förster, D
13:00  Lunch break / BuildairLounge
Session 3: Air permeability of structural components 

Testing products for airtightness
Søren Peper, D

Ariane 6 – Similarities between a carrier rocket and the airtight building envelope
Stefanie Rolfsmeier, D

Customizing the BlowerDoor method for the leak detection in the aircraft cargo hold
Victor Norrefeldt, D
15:30 Coffee break / BuildairLounge
Session 4: Visualizing leaks

Leak detection as part of the final test according to the German Energy Savings and Renewables Act (GEG) – a critical discourse
Klaus Vogel, D
  Leakages "fit for purpose (!?)" – zombie chimera, stopgap or just absurd?
Ulf Köpcke, D
  Discussions and debates
Klaus Vogel, Ulf Köpcke and Wilfried Walther
17:30 End of the oral presentations
afterwards Inspiring conversations in the online BuildairLounge – with stimulating beverages from your own refrigerator


Saturday, June 26

All times refer to Central European Summer Time

Session 5: Improving measurement accuracy

Pressure build-up in very airtight buildings – patience avoids measurement errors
Joachim Zeller, D

Building pressurization tests in a wind tunnel: design and characterization of a reduced-scale experiment facility
Bassam Moujalled (Adeline Mélois), F

Proposal regarding the zero pressure level when measuring high-rise buildings
Søren Peper, D
11:00 Coffee break / BuildairLounge
Session 6: Thermography and ventilation

Thermography during summer time? – Why not!
Ben Standecker, D

Decentralized ventilation units under wind impact
Oliver Solcher, D
12:30 Lunch break / BuildairLounge
Session 7: Advanced airtightness 

Ensuring airtightness from the outside? Robust solutions for renovating high-pitched roofs.
Robert Borsch-Laaks, D

Design of high-performance control towers: Importance and difficulty of achieving duct and envelope airtightness
Fabrice Richieri, F

Airtightness testing of clean rooms (isolation rooms) in a new hospital building
Michael Wehrli, CH

Air permeability testing of a 125-meter-tall high-rise building (lessons learned)
Stefanie Rolfsmeier, D, Emanuel Maringer, A

Closing words
Wilfried Walther, D
15:50 End of the symposium


Looking at products online does not make sense, which is why we are foregoing the trade exhibition accompanying the conference 2021.

It should take place again in 2023, you are welcome to ask us your questions now:

Margareta Hollmann 
Uwe Brockmann



Detailed information about your participation and registration you will find here soon.

Conference dates 

Friday/Saturday, June 25/26, 2019

Conference place 

online conference

Conference languages

Simultaneous interpretation will be provided for the complete conference in English and German. When dialing into the video conference, you can choose the language. You will receive instructions on how to do this with your login details.

Conference record

All abstracts will be included in the digital Conference Proceedings in German and English. The contributions provided by the speakers in their original language can be downloaded from the website (www.buildair.eu) after the conference.

Conference secretariat

Energie- und Umweltzentrum am Deister GmbH
Zum Energie- und Umweltzentrum 1
31832 Springe, Germany
Tel. +49 5044 975-20
Fax +49 5044 975-66
E-Mail: bildung@e-u-z.de
Kontakt: Sabine Schneider

Registration fee

  until May 7, 2021 later
participation both days 319 Euro (379,61 incl. VAT) 379 Euro (451,01 incl. VAT)
participation one day 189 Euro (224,91 incl. VAT) 239 Euro (284,41 incl. VAT)

Fees cover: attendance of all the sessions, BuildairLounge, conference proceedings.

Deadline for registration is June 18, 2021. 

Terms of registration

Once you have registered, you will receive a confirmation of your registration and the invoice.

Cancellation of registration has to be submitted in writing. We will charge an administrative fee of 60.00 € (incl. VAT) if cancellation is made up to 21 days prior to the Symposium, date as postmarked. After that date, or if you are unable to attend the Symposium, we will charge the full amount as specified in your invoice. Prior consultation provided, you may suggest an alternative participant.

In case the Symposium has to be cancelled for extraordinary reasons, we will inform you immediately. In that event, we are only obliged to refund any participation fees you may have paid before that date. We reserve the right to change the list of speakers and/or the program in exceptional cases. In any case, the liability is limited to the participation fee.

download terms of registration / privacy policy

Open registration form


Thank you very much for your very interesting presentations, which highlighted many different facets of the airtightness of the building envelope, building thermography and ventilation technology.


Contact for journalists

Ursula Mellema


Please feel free to download

Order form conference proceedings from previous symposia




Information in accordance with § 5 TMG

Company: Energie-und Umweltzentrum am Deister GmbH
Address of company: Energie- und Umweltzentrum 1
31832 Springe-Eldagsen
Phone: +49 5044 975-0
Fax: +49 5044 975-66
E-Mail: info [at] e-u-z.de
business manager: Uwe Brockmann
Commercial register entry: HRB 102155
registry court Hannover
VAT-Id.-Nr.: DE 196244147
Tax-Nr.: 42/200/03435
Responsible person for the content: Uwe  Brockmann
Dispute resolution: The European Commission provides a platform for online dispute resolution: https://ec.europa.eu/consumers/odr
Our e-mail address is to be found above in the imprint.
We are not willing or obligated to participate in dispute resolution procedures ahead of a consumer arbitration board.
Photos: © Energie- und Umweltzentrum am Deister 


Legal disclaimer

Limitation of liability for internal content

The content of our website has been compiled with meticulous care and to the best of our knowledge. However, we cannot assume any liability for the up-to-dateness, completeness or accuracy of any of the pages. Pursuant to section 7, para. 1 of the TMG (Telemediengesetz – Tele Media Act by German law), we as service providers are liable for our own content on these pages in accordance with general laws. However, pursuant to sections 8 to 10 of the TMG, we as service providers are not under obligation to monitor external information provided or stored on our website. Once we have become aware of a specific infringement of the law, we will immediately remove the content in question. Any liability concerning this matter can only be assumed from the point in time at which the infringement becomes known to us.

Limitation of liability for external links

Our website contains links to the websites of third parties (“external links”). As the content of these websites is not under our control, we cannot assume any liability for such external content. In all cases, the provider of information of the linked websites is liable for the content and accuracy of the information provided. At the point in time when the links were placed, no infringements of the law were recognisable to us. As soon as an infringement of the law becomes known to us, we will immediately remove the link in question.


The content and works published on this website are governed by the copyright laws of Germany. Any duplication, processing, distribution or any form of utilisation beyond the scope of copyright law shall require the prior written consent of the author or authors in question.


May 2018 / source: eRecht24

Privacy Policy

This privacy policy is intended to inform you, as the user of our website, about the nature, scope and purpose of the collection and use of your personal data by us.

Responsible in the sense of the European General Data Protection Regulation (Datenschutz-Grundverordnung, DSGVO) and other national data protection laws of the member states as well as other data protection regulations is:

Energie- und Umweltzentrum am Deister GmbH 
Zum Energie- und Umweltzentrum 1 
31832 Springe-Eldagsen 
Telefon: +49 5044 975-0 
info [at] e-u-z.de

Data Protection

Safeguarding your personal data is a serious matter for us. We want you to feel safe and secure when you visit our websites. The protection of your privacy is an important objective for us when processing your personal data. 

Usually the use of our website is possible without personalized data (i. e. name, address, …). In case you may be asked to provide personal information, answering these questions is optional. We use the personal information provided by you solely for the purpose of assisting you individually, which normally means answering your inquiry. 

Any outside service providers whose services we use for individual offerings on this website, e.g., in connection with our applicant portal, are selected with the utmost degree of care in terms of data protection. The nature and scope of the data processing work to be performed are determined contractually, and the service providers with whom we contract are required to comply with the same level of data protection as we do.


A cookie is a small piece of data that a website asks your browser to store on your computer or mobile device. The cookie allows the website tto "remember" your actions or preferences over time. Most browsers support cookies, but users can set their browsers to decline them and can delete them whenever they like.

Most of our Cookies are so-called “session-cookies”. They are delayed automatically at the end of the visit. Other Cookies remain stored in your computer until you delete them.These Cookies allow us to recognize your browser at your next visit. You can install your browser that you are informed about Cookies and you can allow it in certain cases or install a general deletion of Cookies after your visit. General deactiviation of Cookies may lead to an only. 


The provider of the web pages automatically collects and stores information in so-called server log files, which your browser automatically submits. These are: 
• IP-address            
• browser type / browser version 
• operating system used 
• referrer URL 
• host name of accessing computer 
• date and time of server request 
• content of the requirement
• transferred amount of data
This data is not relatable to specific persons by us. We do not link this data with other data sources. We reserve the right to examine this data retrospectively when we get concrete evidence of unlawful usage


If you send us an inquiry by e-mail, your details, including the contact details you provided there, will be stored for the purpose of processing the request and in case of follow-up questions. We will not share this information without your consent.

Registration form

The personal data you provide us with the registration form will be required for the processing of your registration and participation. If required to perform the contract, your personal information will be passed on to public entities to comply with regulatory requirements (eg, tax authorities), to internal entities to perform the individual business processes (eg, accounting, marketing), and to external partners (eg. mail-order firm). A transfer of your personal data to third parties for purposes other than those mentioned does not occur.

The protection of your personal data is very important to us. However, environmental and climate protection are no less important to us. Therefore, we ask for your permission to send you information about our events by e-mail. You can revoke this consent at any time by written notification (by post, fax or e-mail, address details see above) to the e.u. [z.].

Photos will be taken during the conference for documentation and public relations purposes. Therefore, we ask for your consent to publication. We point out that photos, provided they are published on the Internet, can be accessed by anyone. It can then not be ruled out that such persons continue to use the photos or pass them on to other persons.

You have the right to revoke your consent at any time with effect for the future. In this case, your personal data will be deleted immediately, unless legal provisions preclude this. You can always inform yourself about the data stored about your person. For more information, see your rights section.

Your rights

Upon written request, we will inform you about the specific data we have stored concerning you (e.g., name and address). If you have any questions about data security, please contact us at any time at the address given above. You also have the right to complain to us about the processing of your personal data by a data protection supervisory authority.

Objecting to advertising emails

The use of contact data published under the obligation to provide an imprint for sending of unsolicited advertising and information material is objected to. We reserve the explicit right to initiate legal proceedings in case of receipt of unsolicited advertising, for example by spam emails.


May 2018 / sources: e-recht24.dedatenschutz.org