Benefits of Thermally Broken Windows

10 June 2019

What Does Thermally Broken Windows Mean?

A thermal break is a piece of low thermal conductivity material that is inserted between two pieces of materials which reduce or prevent the flow of thermal energy between conductive materials. Thermally broken windows often achieve greater performance ratings with a slimmer profile compared to windows without a thermal break.

What Is It Made From?

A high performance low thermal conductivity material, such as polymer, is used as a barrier between two conductive materials. Polymer material has a high resistance to heat transfer and can insulate up to 500 times better than aluminium. Thermal break profiles have a much lower Uf value and as a result, less heat is transmitted.

Signatures Thermally Broken Windows
The Polymer Thermal Break Prevents Water From Touching The Wooden Interior

Why Is It Needed?

Aluminium is an excellent heat conductor but poor heat retainer, which means without a thermal break you can lose or gain a great amount of heat through the aluminium window frame. This can undermine the performance of a double/triple glazed window. If your aluminium profile does not have a thermal break it will become very hot in the sun and very cold in the rain and snow. Up to 45% of heat in your home can be lost to windows.

What Are The Benefits?

Thermally broken window frames are insulated against hot and cold conduction. The thermal break prevents conductive thermal energy loss. Thermally broken windows vastly improve your home’s energy efficiency, saving you money on gas and electricity while also lowering your carbon footprint.

In Aluclad wood windows, the thermal break material protects the wood inside by preventing water from lodging between the aluminium cladding and the timber. Water that passes between the exterior cladding and polymer thermal-break can escape through drainage holes to vastly prolong the lifetime of your windows.

  • Greater Heat Retention
  • Greater Protection Against Water Penetration
  • Achieve A Slimmer Window Profile Without Sacrifice On Performance
Thermally Broken Windows
Low Maintenance Aluminium Exterior With A Premium Wood Interior

How Are They Thermally Efficient?

In cold climates the thermal break keeps heat indoors and cold outdoors, leading to reduced heating and electricity costs. In warmer climates, the thermal break reduces cooling and air conditioning costs as it helps keep the warm air outdoors. An environment with a more energy efficient climate is much more comfortable and pleasant. Thermally broken windows help to stop noise pollution, condensation, and frost. As a result, dampness and mould are also eliminated.

Condensation occurs when warm air meets a cold surface. In the case of a frame profile that is thermally broken the insulator stops the warm and cold air from meeting and forming condensation. Condensation if left untreated can lead to ill health and respiratory issues especially in young children or the elderly. Using thermal breaks to stop heat loss can assist you in achieving a comfortable, warm and dry home that is beneficial to your health and well-being. The wider the thermal break the better the window will insulate.


Thermally Broken Aluminium Wood Windows
Achieve Slimmer Profiles & Passive Performance With A Thermal Break

Advantages of Signature’s Thermally Broken Aluclad Wood Range

  • Low maintenance powder-coated aluminium exterior with a wooden interior (bare or painted).
  • Achieve extremely low U-Values (as low as 0.65 w/m2k) with a modern sleek slimline profile.
  • Signature boasts a water-tightness rating of 1200 pascals which is two times better than maximum CE standard of 600 pascals which most other high-spec aluclad products qualify for.
  • Longer life-span of your windows with a thermal-break as water will never touch the wood interior thanks to an extra layer of protection.
  • Signature Windows & Doors aluminium profile systems provide optimum ventilation to ensure that no humidity will concentrate between the aluminium profile and the wood, so preventing mould.