At the work an evaluation of causes of the moistening of basement walls of a building “Dworek” of the University of Agriculture in Kraków was presented and preventive measures were suggested. The scope of research works included field investigation for recognizing the structure of foundations and laboratory tests of geotechnical properties of the substratum soils. It was stated that the moisture appearing on basement walls as well as plaster flaking were a result of a sloppy execution of the damp proofing, and precipitation water is a main cause of their moistening. As the solution, there was suggested execution of the horizontal damp-proofing and tight paving the surface of the area in front of the wall of the premises in order to move away the zone of the infiltration of the precipitation waters.

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