Abstract
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.
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