Abstract
A simple method for evaluating the water-proofness quality of coating materials on external linings is proposed. The method is based on the measurement of integral capillarity with dependence on time and on the comparison of its value with that determined for the basic lining material. Measurements of water vapor diffusion then provide the information on the risk of condensation, which may increase after applying the coating. The practical application of the method is performed with four types of lining materials, Dekalux 5, Dekalux 12, Dekalit P6 and Dekalit P10, and three types of the surface treatment, Rudicolor, Aquafob and Rudicolor-Aquafob combination. Measured results show that Aquafob is an effective water-repellent coating material, which keeps, at the same time, a high permeability for water vapor: Rudicolor is only effective for short times (≈ 1 h). The positive influence of Aquafob was observed to increase with decrease in the density of the underlying lining material, which corresponds to its hydrophobic quality, while the plaster material Rudicolor exhibited an opposite trend concerning the density.
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