Experimental Determination of the Vapor Permeability Coefficient of a Sample of Building Material in Vertical Position

Calculations of the moisture transfer require an experimental data of the moisture diffusion coefficients. Moisture transfer mathematical models often use a permeability coefficient as the main factor, which influences the moisture behaviour inside enclosing structures. However, the wet cup method is used for experimental determining permeability coefficients of construction materials. In this method sample of a building material is located in horizontal position, but in a construction industry, there are a lot of enclosing structures which have vertical position. In a current article, a comparison of permeability coefficients of mineral wool insulation for vertical and horizontal positions of samples was made. For that, a new experimental device which has L-type of installation housing and relative humidity sensors installing along the device heights was built. This device allows to obtain the exact value of permeability coefficients for different construction materials in vertical position. Eight experiments with the new device and the same number of experiments by wet cup method were carried out to make a comparison, then statistics methods were used to work with experimental data. The Shapiro Wilk test and Student criterion were used to process the experimental data. As a result, it was discovered that the permeability coefficients of mineral wool in horizontal and vertical positions do not have any differences. The mineral wool insulation was chosen, because it has one of the biggest permeability coefficient from all the construction materials. It proved that the permeability coefficients of mineral wool insulation and other construction materials with less permeability coefficients than mineral wool can be obtained by wet cup method and can be used for vertical enclosing structures without additional refinement coefficients.

K.P. ZUBAREV^{1, 2}, Candidate of Science (Engineering) (This email address is being protected from spambots. You need JavaScript enabled to view it.)

¹ National Research Moscow State University of Civil Engineering (26, Yaroslavskoye Highway, Moscow, 129337, Russian Federation)
² Research Institute of Building Physics of the Russian Academy of Architecture and Construction Sciences (21, Lokomotivniy Driveway, Moscow, 127238, Russian Federation)

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