Abstrakt v cudzom jazykuKaličiak , Štefan: Hydro isolating substances in the building industry. [Bachelor thesis]. Technical University in Zvolen. Faculty of Forestry, Department of Fire Protection. Thesis Supervisor: Ing. Iveta Mitterová PhD. Degree of classification: Bachelor. Zvolen, 2020. 58 s.Isolating substances are an essential part of building constructions and their general task is protection mainly against environmental influences. Considering the extensiveness of this issue, we focused on the selected area – specifically isolating substances, which prevent the building constructions against water and humidity. The aim of this thesis is to outline the idea of hydro isolating substances. Its result is an overview of different types of the alleged substances with descriptions of their compounds, important features and suitable application, when taking into account the weight of the building constructions. We present hydro isolating substances for isolations against radon, isolations for lining, terraces and pools, isolations for cracks, concrete constructions and floors, roof isolations and asphalt roofing, isolations against ground water and humidity, isolations of roads.