Designing buildings, you are aware of the typical impact ofmoisture on building elements and remember about the necessity to design andmakewaterproof protection (for ex.: roofs, garages, tarraces). However, there are also unusual situations of the impact of water – its range and consequences are not always easy to predict. In that case it is necessary to expert find the source ofmoisture and eliminate it. So that the drying process can proceed uninterrupted and that the repairs can produced satisfactory results. Keywords: dampness; flooding; influence of water; impact of water; drying.