The thesis deals with the case of a single-family house in which, after partial renovation of the building envelope, a problem of mold growth and development arose. The purpose of the thesis is to investigate the influence of microclimatic conditions and the physical properties of the structural assembly on the occurrence of condensation and mold growth, and to propose measures to reduce the risk. The objectives include continuous measurement of internal parameters, comparison of the results with legal requirements, simulation of the hygrothermal response of the structure, and definition of conventional and advanced remediation measures. The methodological approach consisted of several phases. First, continuous measurements of air temperature, relative air humidity, and CO₂ concentration were performed in two rooms of the house – one with visible mold growth and one without – and in three measurement periods, covering the heating and non-heating seasons. Data on outdoor conditions were obtained from the archives of the Slovenian Environment Agency. The measurement results showed marked differences between the rooms, indicating the influence of ventilation and thermal bridges. The analysis included the calculation of the temperature difference factor fRsi (0.81), which exceeds the limit value according to the SIST EN ISO 13788:2013 standard (≥ 0.75), which means that mold should not occur on the interior surface. Nevertheless, the simulation of the hygrothermal response of the structure using Ubakus software showed condensation in the layer between the exterior plaster and the polystyrene foam due to the excessive thermal transmittance of the envelope. As an effective measure, additional thermal insulation and a vapor barrier are proposed, which would bring the structure to U = 0.17 W/(m²K), in accordance with the Energy Efficiency Regulations. Plaster with the addition of phasechange material was also tested and proved to be a promising solution for reducing the rate of surface cooling.
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