When designing buildings, it is necessary to meet the requirements of the water vapour transmission in the building structure so that it does not affect its heat transfer and durability. In this master thesis, we have presented existing research, standards, and rules related to water vapour transmission and condensation in lightweight building elements, the evaluation of water vapour condensation, and the parameters that influence water vapour condensation in lightweight building elements. We have developed a correction factor method to treat three-dimensional diffusive water vapour transmission as one-dimensional. The developed method was implemented in an engineering evaluation application for water vapour diffusion with Glaser diagrams, which was used to determine the hygrothermal properties of the building structure. The results were compared with calculations using resistances of water vapour transmittance determined by other methods. Finally, the influence of thermal bridges on water vapour condensation in lightweight building elements is presented.
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