EPS insulation products are rigid boards, which are installed on facades, roofs or floors (under ubfloor/screed). They have different dimensions and colors. The average product studied, swissporEPS, includes various insulation boards whose thermal conductivity ranges from 0.033 W/(m.K) to 0.038 W/(m.K). The function of expanded polystyrene (EPS) products is the thermal insulation of new or renovated buildings and thus the reduction of heating energy consumption. The thickness of the insulation boards to be installed depends on the thermal conductivity of the building materials and the desired thermal performance of the building.