This work is focused on the assessment of moisture condensation in different external constructions of wooden house. The studied wooden construction is constructed from 3 different external wall compositions. There were sensors measuring relative humidity within the external constructions. Meanwhile, external and internal conditions were measured. These conditions and composition of external constructions were used in Teplo 2017 software to assess the moisture condensation. In this work, the influence of the imperfect realization of the vapor barrier on the moisture in external constructions is also theoretically evaluated.