The growing costs of land and buildings force the architects to design living space under the terrain level. These spaces, which are in direct contact with the soli, need to be thermally insulated in order to reduce the consumption of energy and to avoid condensing of water vapours. Exterior insulation installed from the outside and put on hydro-insulation envelops the construction, helps to avoid thermal bridges and it protects hydro-insulation against mechanical damage.

Insulation materials used on places which are in direct contact with the soil must have special properties as the insulation is continuously exposed to various negative impacts, such as the pressure of the soil and underground water. Insulation boards of extruded polystyrene are characterized by a closed cell structure, thanks to which they keep their insulation properties even in contact with moistness and groundwater.

Benefits:

• high pressure strength
• resistance against mould
• easy and simple installation
• great insulation properties
• low volume weight
• saving energy costs
• no need to further protect insulation boards
• possible to cover by soil and pressure by heavy machines