Thermal insulation

Steel profile systems create cosy spaces that are guaranteed to make you feel good for more energy and wellbeing


A comfortable indoor climate makes a key contribution to our wellbeing. Thermally insulated windows, doors, façades and fixed glazing consisting of steel profile systems help to save precious energy – the better the thermal insulation, the lower the energy loss through the building’s shell. Thermally insulating buildings is also a legal requirement: on the European level there is the Building Directive from the European Union and in Germany there is the Building Energy Act (GEG 2020).

The objective measure of thermal insulation: the U-value

Heat loss through building parts is expressed by the heat transfer coefficient or U-value. The U-value indicates how much heat escapes to the outside per square metre if the outside temperature is 1°C lower than inside.

This loss of heat can be minimised by using thermally insulating steel profile systems.

In building parts made up of several components, the U-value can be determined for each individual component as well as for the part as a whole. A letter in subscript after the U denotes the relevant object: For example, a subscript f refers exclusively to the frame whereas a subscript w refers to the window as a whole. Put more simply, the lower the U-value, the greater the thermal insulation.


Thermal insulation prevents energy loss

DIN EN ISO 10077-1 and DIN EN ISO 10077-2 provide the basis for calculating the heat transfer coefficient, which considers the thermal performance of windows, doors and shutters. The legal or normative specifications regarding thermal insulation values that must be adhered to vary from country to country.

With our wide range of steel profiles for windows, doors, façades and fixed glazing, all statutory requirements at a European level can be met – very frequently, the classification of individual steel profile systems goes even further than this. So you can be sure that your building will remain compliant with the ever more stringent requirements, not only today but tomorrow as well.

Daylight helps save energy

To save energy, it is not only essential to prevent heat from escaping from the building shell, but also to maximise the amount of daylight that enters the building. Daylight not only saves electricity but is also a freely available source of light. Because of this, the guiding principles in architecture have changed in recent years. There has been a growing shift away from closed-in, artificial and entirely air-conditioned interiors towards buildings that – without compromising on comfort – require very little energy whilst meeting the demand for greater openness and transparency.