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Insulating glass commonly called double glazing

The heat exchanges that take place between a glass window and the external environment are expressed with the Ug value, glass partition for shower, which represents the thermal transmittance value of the glass, i.e. the heat flow that crosses 1 m 2 of the glass surface when the temperature difference between internal and external is equal to 1 ° C.

The greater the Ug of the glazing, the greater the thermal dispersion. 

Since normal 4mm glass has no insulating power, insulating glass can be used to increase insulation.

The principle of the insulating glass consists in enclosing an immobile and dry air space between two glass panes to avoid heat exchanges by convection, exploiting the low thermal conductivity of the air.

In addition, convection exchanges are further reduced by replacing the air enclosed between the two sheets with a heavier gas with lower thermal conductivity (mainly Argon ) and by inserting a spacer channel (which reduces exchanges by conduction) in heat-insulating material.

With this foresight, the thermal transmittance of glazing goes from an Ug of 5.8 W / m 2 K to 2.7 W / m 2 K.

But in some cases, for example in certain climatic zones, double glazing is not enough to further halve the heat loss. Then it is necessary to use a third plate that forms another chamber filled with Argon gas, thus reaching an Ug of 0.6 W / m 2 K.

Low-emissivity glass: advantages

To reduce radiation exchanges, glass sheets with low-emission deposits can be used. This is because solar energy enters the building primarily as shortwave radiation but, once inside, is reflected by objects back to the glass as longwave radiation.

A low-emissivity glass  (commonly also called thermal glass or insulating glass ) is a glass on which a film of metal oxides has been laid that effectively counteracts thermal dispersion, allowing the entry of heat of solar origin and preventing the escape of the energy emitted by internal radiant bodies, aluminium works in Dubai, reducing heating needs and costs in the colder months.

The coating does not compromise light transmission and thanks to the low-emissivity treatment, dispersions are further reduced, going from an Ug of 2.7 W / m 2 K for normal double glazing, to 1.4 W / m 2 K for low-emissivity double glazing.

To conclude, with the use of an insulating glass (double glass with low-emissivity glass, duct with a warm edge, Argon gas, and/or solar control glass) we obtain:

  • better insulation from the cold in winter (it does not let the heat out) and greater protection from infrared (summer heat) in summer ;
  • the first result will be the elimination of the condensation effect on the internal surface of the frame;
  • this reduction of thermal dispersion allows a considerable saving in the costs for heating and air conditioning of the internal environments;
  • a decrease in the use of heating and air conditioners leads to lower CO 2 emissions into the environment, with a consequent improvement in the greenhouse effect.


Changing or installing new,  more efficient, and performing windows, without considering the importance of glass is a big mistake.

Always get advice from a  professional in the sector, glass cutting shop near me, who is attentive to your wishes but who will be able to show you the best solution for all your needs.