The current knowledge shows that the interior microclimate of residential buildings that were constructed between 1950 and 1990 using panel construction, not only in the Czech Republic but also in Europe, and were renovated in accordance with applicable legislation related to thermal comfort and energy is significantly affected by gaseous pollutants. At increased concentrations and exposure times, these pollutants negatively affect the interior microclimate and at the same time have a negative effect on the health of users. After the implementation of remediation measures, which are mainly focused on improving the thermal technical parameters of the building envelope, the concentration of CO2 in the indoor environment increases. Carbon dioxide is one of the most important active factors and in terms of the quality of the interior microclimate, it is considered a reliable indicator of whether the interior microclimate can be considered a healthy and favorable environment. It is thus clear that the set and de facto systematized measures in the renovation of the housing stock from the second half of the 20th century has led to energy savings on the one hand, but on the other hand, this has contributed to the hygienic damage of housing units and an unhealthy interior microclimate. The paper aims to define the interaction of interdisciplinary contexts that have led to an increase in the indoor air quality (IAQ) of renovated residential panel buildings.

Incidence of microorganisms on thermal-insulated facades in the selected location (Ostrava-Poruba). Incidence of microorganisms on facades is more and more common. It benefits mostly from façade´s thermal insulation. This problem is not only esthetical. Incidence of microscopic fungi increased due to environmental changes. Every person is breathing spores (reproductive particles of mould) unknowingly. There is evidence that spores are closely related to respiratory illnesses. Objects that are vulnerable to microorganisms should be managed in a way, where there is no risk of harm to us or people around us.

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In the last decade we have been faced with a problem with biotic infestation on frontages in engineering practice. This phenomenon has been detected especially on a panel building on which additional contact thermal insulation is applied. The contribution is concentrated on the particular panel building of the series T0 6B-BTS from which samples of the external plaster were taken.

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