English

The Austrian Standard ÖNORM S 5200, prepared in the early nineties after a prestandard phase (Steger F.) and in use in Austria since 1996, provides the criteria to assess the radiation dose of building materials. Gamma radiation of the radionuclides 40K,

There is a currently growing interest in the effect of exposure to 222Rn, because it became recognised as an important “pollutant” factor of the environment. Possible lung cancer incidence due to exposure to environmental radon levels may thus account for

A thermally conductive building envelope must be constructed to be permanently airtight - this has been compulsory according to German building regulations since 1 Jan. 1995. That 6 Para. 1 of the current Energy Saving Regulations, in force since 1 Oct. 2007, nevertheless requires construction of a airtight building envelope...

The Blower Door procedure has shown itself to be a very effective instrument for analysing and quantifying the various components of the total problem for complex ventilation issues...

Conventional techniques for the measurement of adventitious leakage of building envelopes are based on steady pressurisation at high pressures (e.g. 50 Pa) that are not normally encountered with natural or mechanical ventilation. It is the leakage at low pressures (e.g. 4 Pa) that is of interest and it is shown that...

For preselected totals of dwelling houses this article describes how statistical procedures on basis of small samples can be transferred into the prognosis whether the tolerable upper limit of airtighness is fulfilled or not. Necessary requirements on both sides are discussed - quality assurance during production of dwelling houses...

Thermography is often used to locate leaks in connection with an airtightness check. In this context it is important to know under what conditions the inspection system can recognise defects to a degree of certainty and reproducibility. Applications of leak location in checking airtightness use the excitation of the building envelope...

Implementing the EU-directive 2002/91/EF in Danish legislation led to regulations in the Danish Building Regulations on air tightness in buildings set out by the Danish Enterprise and Construction Authority, a department of the Danish Ministry of Economics and Business Affairs. From 2006 air leakage through the building envelope...

Every building must be airtight, and this airtightness is guaranteed by the building envelope. The necessary air change does not happen through the building envelope but through specific measures such as an air intake and extraction plant with heat recovery .Airtightness is achieved through installation of an airtight layer...