Glass as thermal insulation
The main purpose of the enclosures is to act as thermal insulation from the external agents of the building. The Technical Building Code guides us on how and what to use to make the enclosures. One of the materials is glass.
Thermal insulation is one of the technical qualities that glass brings to the room it encloses. An airtightness that adds light, comfort and energy saving. The objective of the glass should be to have as little energy transfer as possible due to the difference in temperature between the inside and outside of the establishment to be insulated. Two factors must be taken into consideration:
- The U-value is important at the time of choosing the type of glass. This is the insulating capacity of the material. A glass with a low U-factor reduces energy loss.
- The composition of the glazing. There are three types of glazing: single glazing, double glazing (ATT) and reinforced thermal glazing (ATR). The second is composed of two glass panes, an air chamber and a double seal. The ATR differs from it in that, instead of air, it is replaced by a heavy gas such as Argon.
The thermal transmittance values (U-value) vary depending on the composition of the glazing. In the case of single glass panes, the U-value is 6W/m2Cº. In ATT, the values will be below 3 W/m2Cº and, in the case of reinforced thermal glazing, it can be around 1 W/m2Cº.
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