The U-value – insulation properties of insulated panels

For construction elements such as insulated sandwich panels, the U-value, which is also referred to as the heat transfer coefficient, indicates how much heat flows through the respective component per square metre.

The lower the insulated panel‘s U-value, the better their thermal insulation properties..

The U-value is measured in watt (i.e. power) per square metre, multiplied by Kelvin, thus W/(sqm*K). In addition to the material properties, the U-value is mainly influenced by the thickness of the component.

The following table shows the enormous differences in the thermal impermeability of typical elements found in a building:

Simple window   


Concrete wall               


Exterior solid wood wall  


One of our sandwich panels



Therefore, an average concrete exterior wall has approximately 18 times greater thermal permeability than one of our insulated panels. This clearly illustrates the excellent insulation properties offered by sandwich panels.

Illustration of an insulated panel with low heat permeability: