Tiny glauconitic sandstones of the middle part of the Godula layers of the Silesian unit of the Outer Western Carpathians, known as Godula or Těšín sandstones, represent traditional building stone materials used mainly in the Ostrava region, Těšín Silesia and Lesser Poland for almost a thousand years. Despite the high quality of their physical and mechanical properties, these sandstones can exhibit very low durability, especially when used outdoors. Already after a very short exposure to weather in the first few years there may be a total destruction of the stone. The reason for the often extremely rapid degradation of the Godula sandstones is usually a combination of the mineralogical - petrographic heterogeneity of the stone, the structural and textural features of the sandstone, in particular the nature of its pore space and the practical use of stone. The ignorance of the actual material properties and behavior of the sandstone by the architect or designer is then often reflected in inappropriate constructional use of the stone, which may result in the need for early redevelopment or even complete renovation of the building.