Airtightness design as required by the KfW

Purpose of the work

The German Industrial Standard DIN 4108-7 has been the standard to stipulate the requirements as well as recommendations for planning and implementing airtight construction for a long time (since 2001). However, the principles of airtight building have not yet been well established in general building practice.

From “16 to 1“ ‒ Retrofitting airtightness of roofs in existing buildings from the inside

Purpose of the work

Many top-floor apartments and single-family homes from the ’80s and ’90s had been insulated in the roof area using aluminum-clad panels or PE foils and had frequently been covered with profiled wood. These buildings suffer from a significant lack of airtightness that can be retrofitted from the inside with a high technical quality. The improvement in airtightness achieved by this approach in most cases shows better results than a retrofit from the outside.

Method of approach

Evaluating the airtightness of the building envelope using infrared thermographic measurements

Purpose of the work

Is it possible to estimate an air infiltration flow rate, based on infrared images?

Method of approach

Laboratory tests and numerical simulations

Content of the presentation

This paper discusses laboratory measurements on a small test house. IRT measurements and (de)pressurization tests were performed on different types of junctions, e.g. at the window-wall interface. The results were analysed by calculating the temperature factor, to compare IRT images from different joints.

Airtight, not completely airtight, not airtight at all. How (in)tolerant is the legal definition of flaw? Observations on the legal assessment of “structural tolerance” and possible related misunderstandings

Purpose of the work

When it comes to evaluating the quality of building work, technical and legal perspectives often clash. This is probably particularly true when it comes to evaluating the airtightness of building envelopes. This presentation is an attempt at clearing up frequent misunderstandings and at formulating questions that would help to combine the technical and legal ways of assessing quality in the most practical manner possible.

Method of approach

19 January 2021 - Upcoming Webinar "Building airtightness improvements of the building stock"

TightVent Europe and the Air Infiltration and Ventilation Centre are organizing the webinar "Building airtightness improvements of the building stock - Analysis of European databases" to be held on Tuesday January 19th, 2021 at 10:00-11:15 (CET).  The webinar aims at presenting three major European databases (in the UK, Flanders and France) and also at comparing their structures and their measurement data acquisition protocols. Weaknesses and strengths in the different aspects of the existing database setups will be identified.


Critical steps for a wide scale implementation of building and ductwork airtightness

This ebook, produced by TightVent Europe, includes a number of publications from the Intelligent Energy Europe programme and its predecessor, namely from the ASIEPI project, SAVE-AIRWAYS, and SAVE-DUCT projects.

Building and ductwork airtightness: Selected papers from the REHVA special journal issue on ‘airtightness’

The 2002 Energy Performance of Buildings Directive (EPBD) already indicated the potential importance of airtightness. With the 2010 EPBD recast and its ambitious 2020 targets, there is even more pressure on these aspects since for most European climates and countries, good envelope and ductwork airtightness levels are necessary to achieve nearly zero-energy buildings.

Refined assessment and comparison of airtightness measurement of indoor chambers using the blower door and Pulse methods

Previous studies have compared the airtightness measurement of test enclosures utilising both the novel Pulse technique and the conventional blower door method.  Discrepancies between results of the two test methods were observed and it was concluded that differences either caused by wind or blower door installation integrity would have had an impact upon the results.