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The article deals with setting of the degradation of fibre-cement panels containing polyvinyl-alcohol (PVA) fibres. The degradation is being studied with a help of a soaking ? drying test. It is a long-time test, which is one of the series of tests (hot water test, frost resistance test, shrinking of panels, UV test), by which the degradation of panels is determined. The motivation for carrying out this test lies in searching for a substitute of asbestos-cement panels that cannot be used due to carcinogenic asbest...

Porosity belongs to basic characteristics of building materials. It is a characteristic of solid or semi-rigid materials, which contain a lot of tiny and uniformly distributed cavities or holes of various shape and origin. Porosity decreases specific weight of materials, increases their insulation and other characteristics ? for example absorbability. It is defined as a ratio of pores volume in a specific amount of solid and the total volume of this amount. In the article the use of the modern confocal scanning mi...