The status quo of airtight building in Germany

Purpose of the work

What is the status quo of airtight building in Germany? Are we well on our way or still far from the target? What about measuring practice in Germany? Should we concentrate on the documentation of measurement results or is it more important to exert a positive influence on the building process overall? Which requirements and targets are set by the legislators, which by the development banks?

Method of approach

Overview, compilation and review of publications.

Content of the contribution

Decentralized ventilation system versus (the lack of) building airtightness

Purpose of the work

By way of practical examples, the presentation shows that decentralized ventilation systems do neither make airtightness measurements more difficult nor distort them, and despite the requirements for a high level of airtightness for buildings also ensure good indoor air quality.

Method of approach

The airtight cistern – A blessing or a curse?

Purpose of the work

Over the past years, the industry has launched a great number of products facilitating the airtight installation of sanitary fixtures in the airtight building envelope. However, the pre-wall mounting racks of cisterns remain a “key point” for assessing the airtightness of pre-walls.

Method of approach

As part of the rehabilitation of an indoor swimming pool, “airtight” pre-wall mounting racks were developed and used. This was due to the flush buttons causing “seepage” of the compound seal.

Ductwork and envelope leakage diagnostic, impact analysis and improvements in an airport control tower

Purpose of the work

In an air traffic control tower, conditions for thermal comfort are crucial as the task of air traffic control requires high level of attention and vigilance. Comfortable conditions must be guaranteed all the time especially during extreme periods. Therefore, the HVAC system of a control tower is always composed by two, possibly three, identical air handling units, functioning in full redundancy.

Air-flow and airtightness measurements of centralized ventilation systems

Purpose of the work

Many ventilation systems do not work efficiently, because their airflow rates have not been correctly adjusted and due to leakages of the ventilation ducts and individual elements.

Method of approach

Different measuring devices are used to evaluate and adjust the flow rates, to conduct airtightness tests with differential pressure measurements of ventilation systems or their parts, as well as to search for leakages of ventilation components.

Content of the contribution

Components permeability (q50) by means of in-situ blowerdoor tests

Purpose of the work

The overall buildings leakage results from the sum of the individual contribution of its components. Quantifying this contribution would be of major importance for building designers that intend to improve building enclosures for airtightness optimization. Typically, building components airtightness is tested in laboratory but several examples of a different in-situ performance are reported in the literature. Therefore, this work aims at assessing the air permeability of several building components using in-situ blower door tests.

Airtightness of multifunctional tapes

For several years, multifunctional tapes have increasingly been used for the airtight installation of windows in new buildings or renovation projects. The adhesive tapes are wrapped around the window on three or four sides. After the installation of the window, the tape expands and closes the joints between window and reveal. Their manufacturers sing the praises of these self-expanding joint-sealing tapes made of foam plastic. However, BlowerDoor tests frequently reveal faults. Accordingly, experts vary in their evaluation and discussion of the products.

Zonal pressure testing of a dwelling and leakage evaluation – Experience with the thermal anemometer

Purpose of the work

To describe the effectiveness of the thermal anemometer device in assisting airtightness testers to evaluate leakage zones, and specific leakages.

Method of approach

There are two main aspects:

Repeatability of airtightness test results in laboratory conditions

The information about uncertainly is essential to correct interpretation of any measurement. Therefore, several authors investigated the reproducibility and repeatability of airtightness measurement during the last years. The experiments were carried out in real buildings of different size and in actual climatic conditions which complicates the comparison of results. Namely, the question whether the uncertainly is proportional to the measured air flow rate remained unanswered.

The impact of leakages – Simulation calculations Results from the FLiB research project

Purpose of the work

To analyze the impact of different leakages in buildings by way of simulations.

Method of approach

Pages