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High-efficiency glazing

High efficiency glass hr++HR++ glass stands for high-efficiency glass. When we refer to HR++ glass, we mean double-glazing fitted with an HR-coating on the inside of the air cavity. The thickness of the air hollow and the glass can vary depending on the thickness placed in a window frame or window. Additionally, this hollow is filled with Argon-gas. The Argon-gas, the HR-coating and the thickness of the hollow determine the U-value (read, insulation value) of insulation glass. Only when the U-value is lower than or equal to 1.2 can the glass be called HR++ glass.
Insulation glass forms the basis for a large number of multifunctional glazing; for example, solar control, burglarproof and soundproof glazing.


What does HR++ glass save in terms of CO2?

HR++ glass saves 20m3 gas per m2 a year on average. This amounts to a CO2 reduction of approximately 35,64 kilos a year compared to the use of single-glazing. The actual savings depends on, among other things, the location of the glass (in heated or unheated rooms, north or south), the size of the windows and the heat requirements of the residents.. The U-value indicates the heat conduction of the glass. The lower the U-value is, the better the glass insulates and the less heat is lost. 

What are the advantages of HR++ glass for you?

Assuming that an average house has approximately 20m2 of glass, the use of HR++ glass will save approximately 400m3 of gas per year compared with single-glazing. Naturally, this depends upon the fuel behavior and the glass surface. This is 200m3 a year more than for regular double-glazing. Assuming a gas price of 0,67 Euros per m3, HR++ glass saves 366 Euros a year compared to single-glazing.

Why does insulation glass mist up?

The outside of insulating double-glazing might mist up, due to the fact that condensation occurs on the glass surface. Condensation on the outside can be caused by low temperatures outdoors and a relatively high humidity. The risk of condensation is largest in the morning in the spring and the fall. The condensation disappears as soon as the temperature outside (and of the surface of the glass) rises and the humidity decreases.

Possible condensation does not occur due to a production error, but is in fact the result of the high heat insulation of the glass. This will happen sooner for glazing with a higher thermal insulation, such as HR++ glazing, than for insulating double-glazing or single-glazing with low heat insulation.  

Condensation only occurs in a limited number of situations, but unfortunately it cannot be prevented. Drying the windows is useless. As long as the outside temperature is low and the relative humidity is high, the condensation will return. Condensation on the outside is harmless, because the outside of the glass construction is always draining to prevent the risk of stagnant water.