Oriented strand boards are used to be designed as a water vapor retarder in timber structures. This article presents assessment of latex layer influence on oriented strands boards characteristics. Constructions with latex paint for increasing vapor resistance and constructions with a vapor-proof layer were also compared of indoor air parameters change. The values of hygrothermal properties were monitored in various levels of constructions. Full-scale experiments proved the difference of the humidity phenomena for latex painted boards.

The research is focused on measuring of the diffusion of moisture by composition of the diffusive closed circumferential wall of the wooden house with the proper and improper realization of the vapor barrier. To perform this research the experimental wooden house EXDR1 is going to be used. The wall, which would be the validation of measurement, is designed as a closed diffusion. The aim of this research is to compare the measurement results. The measured values of humidity probes are going to be used for the comparison. These probes are going to be located in place of a wooden post and in the field between the posts and the temperature-humidity sensors that are going to be installed only in the field between the posts. Thus, placing the probes to measure humidity of wooden post and the temperature-humidity sensors are going to measure the humidity and the temperature of with the proper and improper realization of vapor barrier (foil) for interior moisture to simulate processes normally happening inside residential buildings with adjustment of pressure in the measured room.

The article is focused on the study of the water vapour diffusion through the vapour retarder at its varying percentages of damage. Two different kinds of foils are used as a vapour retarder. This experiment points to the actual value of the diffusion values of building materials contrary to the values obtained from the tests according to ČSN EN ISO 12572. In these tests the building material is exposed to various boundary conditions and its parameters are monitored. The final value is the result of approximation of different values, which in the real installation may not correspond to the boundary conditions in a building.