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A thermally optimized profile with a Uf = 0.8 W/(m2K) at 90mm profile width has been developed using new production technology and the first sample have been manufactured. The new profile with the name TopTherm 90 was presented to the public at the tradefair Fensterbau/Frontale 2008 in Nuremberg.


Cross-section of the TopTherm 90


Critical functionality testing of a TopTherm 90 sample window with triple-insulation glazing


Presentation of the TopTherm 90 at the tradefair Fensterbau/Frontale 2008 in Nuremberg

Click here for the current HWFF flyer as a pdf file

The next stages of the project were to field-test the profile and frame construction concerning thermal and mechanical properties; these tests have now been successfully completed.


Two TopTherm 90 windows (with triple insulating glass and vacuum insulation glass) at the glasstec 2008 trade fair

The TopTherm 90 has been further developed into the TT 90 - R.


Cross-section of the TT 90 - R



Design study of the TT 90 - R with triple glazing (left) and vacuum insulation glass (right)

The TT 90 - R achieves a Uf value of 0.65 W/(m2K) at a glazing thickness of 36mm and a total unit thickness of 90mm. A Uw value of 0.77 W/(m2K) is achieved with triple glazing (Ug = 0.7 W/(m2K)) and a Uw value of even 0.68 W/(m2K) can be achieved using vacuum insulation glass (Ug = 0.5 W/(m2K)); both windows measure 1.23m x 1.48m.

Life cycle assessment in accordance with DIN EN-ISO 14044 shows that the TT 90 - R has clear advantages over aluminium profiles and some advantage over PVC profiles (even though the TT 90 - R’s potential recycling capacity has not yet been evaluated).

A thermally optimized facade system has been developed. The Active Facade 280 AF not only achieves excellent insulation values, but also has improved features to accommodate cable ducts and functional facade elements such as PV modules and facade collectors. Due to their reliable aluminium design, the profiles satisfy even the highest static demands. Specially-developed pressure plates and isolators ensure excellent insulating values and also enable rapid, sufficient dehumidification.
Moving-part windows in reliable aluminium design with conventional or vacuum insulation glass can be applied as well as static elements.


Cross-section of the Active Facade 280 AF

This construction has excellent insulation values: at a glass thickness of 48mm, the profiles achieve a Uf-value under 0.8 W/(m2K); using triple glazing with a Ug-value of 0.7 W/(m2K) the Ucw-value is 0.87 W/(m2K), and using a combination of vacuum insulation glass and insulation glass with a Ug-value of 0.4 W/(m2K) the Ucw-value is even 0.81 W/(m2K). The influence of the screws has been taken into account in all these values (element size 1.1m x 1.2m).


Design study of the Active Facade 280 AF with different elements – triple glazing, vacuum insulation glass, PV vacuum insulation glass and solar-thermal facade collector