Thermal insulation requirements relating to windows have increased in recent years. Energy loss in buildings chiefly occurs through windows. Through greater installation depths and the introduction of multi-chamber systems, it is also ensured in the new thermal insulation regulations that PVC profiles are assigned to frame group I. Heat transfer coefficients considerably below 1.0 W/m²K can be realised through the use of modern thermal insulation glass

Four and more chambers for enhanced thermal insulation

The further increase in recent years in thermal insulation requirements have led to increased efforts on the part of profile manufacturers to improve the thermal insulation characteristics of their systems. One objective of these efforts was to develop profiles whose thermal heat transfer coefficient is close to that of the glazing. Attempts were made in this respect to achieve this improvement without changing the previous installation depth. While this increase from two-chamber profiles to three-chamber profiles achieved a appreciable improvement, a further increase in the number of chambers did not lead to the desired results. The solution to this dilemma was a complete restructuring of the profile geometry with installation depths of 70 mm and greater. It thus proved possible to achieve heat transfer coefficients in the order of magnitude of 1.2 W/m�K while utilising standard steel reinforcement elements. In conjunction with thermal insulation glazing, thermal insulation values of 1.2 W/m�K and lower are no longer a dream.

Installation of new windows pays off.

Old and poor windows are one of the major sources of heat loss in building shells. They represent the weak point in the building facade and can lead to endless costs. New windows that seal effectively when closed help you save a lot of money.