How Do Double Glazing Windows Work?

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How Do Double Glazing Windows Work?

Sunlight produces short wave infrared radiation – this is what warms objects in the sunshine. The short waves are absorbed by glass from the outside and the energy becomes re-radiated from the inside of the glass as long-wave infrared. However, the key to reducing noise as much as possible is to disrupt the sound waves and frequencies as they pass through a material. This can be done by combining different thicknesses of glass close together. As the sound wave travels, dense objects absorb the energy which reduces the frequency of the waves as it passes through. This is why, if you put your ear to a wall you can hear people talking on the other side but if you step away from the wall you can’t hear it. In winter you can really feel the difference because they can keep the heat in and your bills low.

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This is where you will see that the double glazed unit is compromised and starts failing. As mentioned previously, if your home or the windows in it are over a certain age, it may be time to evaluate whether double-glazing is working for you. Double-glazed windows have an expected lifespan of at least years, depending on window quality, weather conditions and homeowner care. If you know your windows are approaching this milestone, this could be another warning of potential performance problems on the horizon. CN Glass supply and install double-glazed units to strict British Standard, and we will provide you with a 10-year sealed unit guarantee.

Double Glazing: How It Works

In the picture below, we have compared single glazing to double glazing, triple glazing, slimline double glazing and vacuum double glazing. As you can see vacuum double glazing is the best glazing option for retrofitting in terms of thickness and thermal efficiency. Single glazed windows have a low level of insulation which leads to poor heat retention and solar control properties. Single glazed windows only have one pane of glass so the heat can escape through the glass very quickly. However, if you notice misting, or worse, water pooling between the two panes of glass in your window, this is a tell-tale sign that the double glazing has failed.

Benefits of double glazed windows

So you’ll be spending less money on heating your home in the winter and air conditioning in the summer. Now that you have confirmed that you are FENSA registered and have a qualified double glazing supplier, we can explain the process of installing the windows in a bit more detail. If you do not meet these criteria, you will be unable to fit double glazing yourself and will require a professional solution. We can further enhance the insulation by putting an insulating connection joint called Warm Edge, which avoids thermal transmission through the two panes of glass. The timber windows are retrofitted instead of ripping out the joinery and replacing the entire window.

All windows are designed to withstand heavy rain, but some window frame materials find it difficult to handle the extremes of temperature as these make them expand and contract. The insulating Argon gas between the panes of glass within the double glazed sealed unit reacts to alterations in temperature by expanding and contracting. This is known as thermal pumping and windows that are south facing in direct sunlight are most vulnerable to it. Double glazed sealed units have only affordable double glazing broken down (failed) if moisture or “misting” appears between the two double glazed glass panes. The seal can break for a number of reasons, including the age and condition of the window frame or a problem with the manufacture of the unit. It could also be due to how the window was originally installed or a chemical cleaning material used on the window that over time has damaged the seal. While double glazing was developed to reduce heat loss it came with other great qualities.

When the airtight seal on these units wears, the gas can seep out, rendering windows less energy efficient. By adding an extra piece of glass to your windows, you can vastly reduce heat loss and reduce the annual cost of your energy bill. Double glazed windows have a heap of other advantages too – for example two panes are much more difficult to smash than one, so they can further increase home security. They are guaranteed to add value to your home if you upgrade from single pane to double glazed windows, as they will increase the overall energy efficiency of the property. The robustness of your double glazed windows is largely based on the quality of the sealed unit.

Commercially, double glazing was ‘invented’ in the US in 1930 by a CD Haven and this was later patented as ‘Thermopane’ by an Ohio glass company. After this, in the 50s, double glazing began to filter into the homes of Americans. The sealed window unit (also known as an insulated glass unit or IGU) is the key to the window’s workings and is also the part most prone to failure. But if you’re just looking to get the glass installed, not the frames, says you can expect to pay upwards of $200 per square metre for the double-glazed glass. On top of that you’ll need to factor in the cost of the glazier, which can be between $70 and $90 per hour. Once you have picked the style and colour our installers will need to take precise measurements for your windows so that the correct size can be ordered and manufactured. Once this stage is complete, the installation team will arrange a convenient time and day with you to come and install your double glazing.

Interior condensation occurs when the sealed unit seals start to fail, and more moisture enters the sealed unit. The desiccant gets saturated and cannot hold any more moisture, and as a result, condensation occurs in the unit. The gas layer minimises the thermal transfer level and decelerates the conduction of heat between two varying temperatures. Windows with an A++ rating are the best performing, while a window with a rating lower than B will be losing more energy than it saves. This is why all of our double glazing achieves a B-rating or higher, with the majority rated A and above. Secondary glazing provides a solution for homes that are unable to install double or triple glazing due to the structure of their home.

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