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What are thermally broken windows?


A thermal break is a piece of low thermal conductivity material that is inserted between two pieces of material to reduce or prevent the flow of thermal energy between conductive materials. The term thermally broken generally relates to window and door frame, which are quite important, if not more than the glass. It is, in fact, all about the frame which is an important part for windows and doors. They form a crucial part of window and door system. Mostly, the frames are made up of aluminium, however, the aluminium being a conductor of heat and cold, which means that frame, can lose and gain the heat according to the temperature outside. This can eventually lead to the poor performance of double glazed windows. Thermally broken windows do a better job and can achieve greater performance as compared to windows without thermal break.

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What are they made of?

The thermal material is generally made up of polymer to achieve high performance. The polymer is used as a barrier between two conductive materials. They have very high resistance to heat transfer and can insulate better than any material, even aluminium. It is believed that they can insulate 500 times better than any material.

Why do we need thermally broken windows?

Although aluminium is a great heat conductor, it is a poor heat retainer. This means that without a thermal break you can lose or gain a significant amount of heat. So if you do not have a thermal break in your aluminium profile, it can become very hot during the summer, and extremely cold during the fall. Up to 45% of the heat in your house can be lost to the windows.

Key points to note with thermally broken windows

If you are considering fixing metal windows and doors, here are a few key points that you keep in mind specific to thermally broken profiles.

  • If space is in extreme heat and humid temperatures: If the temperature is quite is high, it will surely mean that heat from the outside will come in contact with the steel temperature of the structure, which will eventually lead to sweat condensation. The thermally broken will prevent the sweat condensation, as the interior side is separated from the hot exterior surfaces with the insulator.
  • If space is in cold temperatures: during the colder temperatures, thermally broken helps to keep the cold and frost out and the warmth in from the heating system. It makes sure that the heating system is not overworked and the heat is not lost. With non-thermal break windows, the cold is transferred from exterior to the interior which leads to moisture and condensation on the glass, and eventually the frost build-up.

Benefits of thermally broken doors and windows

  • Thermally broken windows and doors are capable of conducting the heat and noise 100 times slower than the aluminium.
  • They provide much needed layers of security.
  • They are not high maintenance and can be maintained easily.
  • They are quite robust, durable and long-lasting.


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