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Triple Glazing Explained

Double glazing is typically constructed by using two panes of glass whereas triple glazing has three panes. Triple glazing can save you even more on your heating bills because when used in the right way, they can achieve a very low U value*.

How Triple Glazing Works

TWS supply only the highest quality products and we choose PLANITHERM as our strategic partner for glass / sealed units. PLANITHERM is Europe’s best selling range of high-performance low-E (low-emissivity) glass. PLANITHERM has been specifically designed to maximise interior comfort and energy-efficiency within the home. PLANITHERM glass has an advanced coating which is designed to reflect the heat from inside the home back into the room, whilst absorbing more warmth from natural daylight.

While double-glazing can provide an excellent level of energy efficiency, triple glazed windows can offer even more thermal performance. The third pane of glass and gas filled cavity provides even more thermal efficiency.


Key differences between double glazing and triple glazing

1. Cost savings – double glazed windows can provide a cost savings and exceed the requirements of current building regulations. Triple glazing however also allows a high level of solar heat gain, capturing warmth from natural daylight and drawing it into your home and leveraging exceptional thermal insulation properties to keep heat in. Triple glazed windows may well achieve and exceed the maximum “A+” window energy rating and provide an even lower U-value*.

2. More comfort – enhanced thermal efficiency of triple glazed windows ensures that cold spots are a thing of the past. Triple glazed windows can also provide excellent thermal acoustic performance and minimise noise levels from outside. Adding acoustic laminated glass can add even more external nose reduction.

3. Enhanced security – the extra pane of glass in triple glazing can provide greater security and help keep your home safe and secure. You can take this further by adding laminated glass for even more security.


Question: Frequently asked questions relating to triple glazing…

Question: Why choose triple glazing over double glazing?

Answer: Triple glazed windows can be around 40% more thermally efficient than double glazed windows. This can help to reduce heating bills and carbon emissions and help keep your home warmer for longer. The extra pane of glass provides a security benefit and can keep unwanted noise outside too.

Question: Can I fit triple glazing to any windows?

Answer: Triple glazed units are wider than double glazed units and are heavier too due to their composition and so they require a different frame to support the additional depth and weight. New window frames can be supplied to accommodate these parameters or if a survey of your existing window frames shows that you have the right kind of frames already, then then you may also be able to upgrade to triple glazing.

Question: Does triple glazing meet Building regulations?

Answer: Yes. Triple glazed units far exceeds the current minimum performance level required by Building Regulations however. The Government has introduced the Code for Sustainable Homes and these current levels are anticipated to tighten in the future and triple glazed solutions could be one way that they intend to meet new more stringent energy efficiency standards.

Question: Will my home overheat if I fit triple glazing?

Answer: No. The level of solar heat gain from outside is actually less through a triple glazed window than a double glazed window. Because the overall energy balance of a triple glazed window is much better than double glazing, basically, less solar heat can come in but also, less heat is lost through the window.


*U-value reflects the thermal insulating performance of a building, the lower the co-efficient is, the better the insulating performance.

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