HDPE geomembrane is an insulation material with a very wide range of applications in road and railway construction, municipal investments, e.g. in sealing landfills. Permanently embedded in the ground substrates, HDPE geomembranes fulfill various functions arising from project assumptions, such as improving the physical and mechanical parameters of the construction substrate, reinforcing slope stability, altering the values and directions of groundwater filtration, and creating durable waterproof and gas-tight barriers in the soil environment.