Sandwich elements are elements with their inner and outer sheets combined into one element so that they can be used in stacked constructions. The aesthetic outer sheet is self-supporting, while the inner sheet supports the element. Thermal insulation is inserted between the inner and the outer sheets. The type and the thickness of the insulation are determined by the requirements of the facade. The options range from a simple EPS 60 to the high-grade insulation materials such as a PIR or RESOL.