The appearance and growth of mould in the indoor environment is a widespread problem that negatively affects health and causes damage to the facility. Often, the problem of fungal growth in the indoor environment is related to indoor and outdoor conditions and the characteristics of the building envelope, which are interrelated. Therefore, as part of the master's thesis, we performed parametric analyses of the influences of the internal environment on the phenomenon of mould growth on the basis of experimental measurements of microclimatic conditions. We used several different numerical and analytical models (VTT, Sedlbauer, Hens, ESP-r) to assess the risk of mould occurrence and growth. The results of the analyses were used for mutual comparison and critical evaluation of the applicability of individual tools and models of mould growth. Finally, suggestions for improvements to prevent the appearance and growth of mould in the indoor environment are also given. The VTT and Sedlbauer models proved to be the most reliable models, while the Hens and ESP-r models did not return satisfactory results. The fRsi factor defined in the standard SIST EN ISO 13788:2013 does not provide the necessary safety against appearance of mould. In addition to the thermal transmittance of the building assembly, are most influenced by the internal temperature and internal humidity.
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