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Thermal Break Aluminium Windows and Doors: what they are and when to choose them

20 September 2023

Aluminium is the most suitable material for windows and doors, especially in terms of practicality and design. To maximise its performance, thermal break windows and doors are used, which provide effective thermal and acoustic insulation. This article deepens into the concept of thermal break aluminium frames, with all its advantages.

The advantages of aluminium frames

Choosing aluminium for the windows and doors of one’s home is a solution that can meet various needs.

In previous articles, we have already seen the countless advantages of aluminium. It is primarily a light and ductile material, but just as resistant to weathering. It does not fear the wear and tear of time, guaranteeing a much longer lifespan than other materials commonly used for window frames.

It is also a highly versatile material that can be easily customised to meet all the design and aesthetic requirements of the home; thanks to its characteristics, it requires very little maintenance and can adapt to any type of building, even supporting large glass surfaces. It blends well with the most different architectural styles and can be used without problems in residential or commercial buildings.

Due to its solidity, aluminium window profiles can be much thinner than those made of PVC or wood; this leads to a more refined appearance and a brighter environment. Finally, it is very important to remember that aluminium is a naturally available material that is 100% recyclable.

When choosing a window or door, it must be considered that aluminium guarantees maximum comfort and maximum performance in terms of technical and aesthetic performance. Its optimal thermal and acoustic insulation capacity is made possible by its thermal break, a solution that makes aluminium the perfect material for your window frames.

Infissi in alluminio a taglio termico

What thermal break aluminium frames are

In addition to all the performances listed so far, one of the main functions of windows and doors is to guarantee excellent thermal insulation; this serves to maintain a comfortable micro-climate inside the house in all seasons, avoiding the formation of condensation and air passages (thermal bridges). In turn, this has a positive impact on the energy efficiency of the house and, consequently, on the economic costs of the energy used for heating and air conditioning.

As a metal, aluminium is in itself a good conductor of heat. But, for decades now, this has been definitively overcome thanks to the introduction of thermal break.

Thermal break is an insulation system that is integrated into the aluminium frame, and which is able to maximise the insulating performance of the window. Thermal break is so called because it ‘cuts‘, i.e. totally interrupts the passage of heat from the inside to the outside and vice versa, thus eliminating heat loss. Thanks to thermal break, the conductivity of aluminium is completely neutralised; it is therefore possible to benefit from all the extraordinary advantages of this material, without having to give up thermal insulation and living comfort in any way.

How thermal break works in aluminium frames

The thermal break is achieved by means of an insulating material that is inserted between the internal and external profiles of the window frame, creating a barrier to the passage of air. This is a channel made of plastic material that, thanks to its properties, guarantees highly effective thermal insulation. In particular, the insulating material commonly used is glass-fibre reinforced polyamide; it is an excellent insulator, is very resistant and has an expansion rate compatible with that of aluminium.

By interposing itself between the two aluminium profiles, this material prevents contact points between them, reducing heat conduction to a minimum. This allows aluminium windows to be used brilliantly in locations where it is very cold but also very hot: warm air in winter or cool air in summer stays inside the house, without any dispersion to the outside.

Thermal break aluminium frames and energy efficiency

At one time, knowing the conductive properties of aluminium, it was feared that this material could create problems in the manufacture of window frames. Today, thermal cutting is an absolutely tested and standardised procedure that solves once and for all the only disadvantage of this material in its use for windows and doors.

Thermal break aluminium windows and doors, such as those from METRA Building, are therefore fully compliant with current energy standards; perfect for new energy efficient buildings, but also for renovating old buildings with a view to energy requalification.

This happens because, as we have seen, thermal break is able to eliminate thermal bridges, i.e. the passage of hot (or cold) air from the inside to the outside. Thermal bridges are the cause of about 30% of energy waste; by neutralising them, greater energy efficiency can therefore be achieved with a consequent saving in energy bills, especially if combined with correct wall insulation and the right choice of glass for windows.

Thermal break also improves sound insulation

When talking about thermal break aluminium windows, one often focuses only on the advantages that can be achieved in terms of thermal insulation and reduced heat conductivity. But it should not be forgotten that thermal break is also very effective in reducing the passage of noise from outside that can negatively affect living comfort.

In fact, the joining of the two aluminium profiles by one of the polyamide bars contributes to better sound proofing of the house; this sound-insulating result can be further improved by choosing suitable glazing.

The advantages of thermal break aluminium frames

We summarise below all the advantages of installing thermal break aluminium windows and doors in your home.

Thermal insulation

Thanks to thermal break, aluminium windows and doors provide a more effective thermal cover than other materials commonly used for frames, such as PVC (read also: Aluminium and Pvc: features and comparison), wood and steel. By interrupting the metal continuity, thermal break eliminates conductivity and the consequent passage of air.

Energy efficiency

Thanks to their excellent results in terms of thermal insulation, thermal break aluminium frames eliminate any dispersion of warm or cool air from inside the house to the outside. This result is very good for the environment, as it eliminates energy waste, which, in the case of inadequately insulated windows, can be as much as 30%.

Energy saving

As a consequence of the previous point, thermal break aluminium windows are to be considered not so much as a cost, but as an investment in terms of energy savings. Although this product may have a significant price at the time of installation, it allows the investment to be recouped in the long term by significantly reducing the costs of the bill in terms of energy used for heating and air conditioning the house.

In addition, replacing old windows and doors with high-performance thermal break aluminium frames would mean energy requalification; in this sense, the regulations in force would allow tax deductions and thus recover a fair amount on the initial investment.


In combination with the choice of the most suitable glass, the thermal break aluminium window eliminates thermal bridges and prevents the possible formation of mould and condensation; this also has extremely positive repercussions on air quality and the maintenance of an ideal micro-climate for the health and well-being of tenants.

In addition, the thermal break of aluminium windows also provides excellent soundproofing; the blocking of noise from outside, especially in locations with high noise pollution, contributes to a significant improvement in living comfort2.

All the advantages of the material aluminium

In a nutshell, thermal break provides excellent insulation, thus complementing all the other excellent qualities of aluminium – as seen at the beginning of this article. Thermal break aluminium windows and doors are therefore complete products, offering only the highest quality benefits and performance.

METRA Building thermal break aluminium windows and doors

METRA Building offers a wide range of thermal break aluminium windows and doors; these can be windows or balcony doors equipped with different opening systems: sliding, casement, pivoting and so on. Aluminium offers excellent properties of lightness, mechanical resistance and durability; in combination with thermal break, thermal and acoustic insulation is guaranteed at the highest level.

METRA Building thermal break aluminium windows and doors can be customised according to the most diverse requirements in terms of shapes, sizes, finishes and colours. In the latter case, almost all existing shades can be obtained by oxidising or painting, with even the possibility of obtaining different colours and effects for the inside and outside of the window.

Thanks to its qualities and extraordinary aesthetic impact, aluminium can be used to make windows and doors that adapt to any architectural style; they are particularly ideal in modern, design-orientated homes or offices.

METRA Building aluminium windows and doors are complemented by customised handles and other aesthetical complements and anti-burglary elements to ensure maximum security.