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Double Glazing FAQ

Double glazing all the windows in your home can be a huge job and an expensive investment but the savings you may make in the long term may make it worth it.

Many people assume double glazing is as good as it gets for noise reduction. In fact, secondary glazing can be up to five times better at tackling noise pollution. Double – and even triple – glazing has multiple panes of glass separated by a gap typically less than 20mm. The thickness of the glass is also important.

Condensation is not caused by double glazing (although new windows can sometimes make condensation problems worse, by cutting out draughts). Treatment for condensation is ventilation (to vent moisture-bearing air to the outside) and heating (to raise surfaces above dew point temperature).

Tinted glass will help reduce heat transfer in summer but equally blocks the valuable solar heat gain in winter. Once the sun is off the glass the double glazing effectively insulates your home from heating up in summer and prevents heat loss in winter.

If the glass inside your double glazing has become foggy or misted, this is a sure sign that your sealed unit has failed. Some companies can repair all types of double glazed window unit, even if you have a leaded window pattern.

They can be fitted in the rain, although when they are sealed outside with silicone, if the bricks/wall is too wet, the silicone won’t have a good bond to it. Down the line the silicone could let in water.

Retrofit double-glazing is the process of replacing your existing single glazing with double glazed units. The process is quick and unobtrusive.

It’s very difficult to break a double glazed window without making a noise. All modern windows come with double glazing, which means that there are at least two obstacles to overcome in order to break the glass. First, there are the two panes of glass. Second, the gas between the panes works as shock absorber.

As the air gap is very narrow, the air cannot circulate freely and thus reduces heat loss by convection as well. The radiation heat loss is merely reduced by efficient double glazing. It is found that almost 54 to 64 percent total heat loss can be reduced through Efficient Double Glazing.

The space in between can be 6mm, 8mm, 10mm, 12mm, 14mm, 16mm, 18mm or 20mm. Hence if you are looking at a Double Glazed unit that has a spacer of 12 mm, the overall thickness is 12mm (space) plus 8mm (glass) totalling 20mm thickness and this is expressed as 4 12 4.

Firstly, energy efficiency ratings are coded by letters between A and G. A is the most efficient, while G is the least efficient. So, a A- rating would mean the windows don’t lose energy as they only let out as much heat as they let in from the outside. However, with an A+ window, it lets in more heat than it lets out.

Windows are a functional update that are not so noticeable visually, but are much appreciated for improving energy efficiency. An expenditure on new windows can bump up an asking price on a house.

The biggest issue with condensation is when it forms between the two panes of glass; this shows that your double glazing has failed and it will not be keeping your home as warm as it should so will need to be replaced.

Insulating glass (IG), more commonly known as double glazing (or double-pane, and increasingly triple glazing/pane), consists of two or three glass window panes separated by a vacuum or gas filled space to reduce heat transfer across a part of the building envelope.

Energy rating of thermal insulation glass improved. Double glazing window energy efficiency can be further increased by substituting dehydrated air with an inert gas, such as argon, xenon or krypton within the unit. Argon, which has 34% lower thermal conductivity than air, is the most commonly used.

Most people think the gap caused by broken window hinges is the seal shrinking. On older uPVC and aluminium windows, window glazing seals were used to hold the glass or double glazing in the window. These seals can shrink back leaving a gap between the sash and the glazing. The glazing seals can easily be replaced.

Sash double glazing windows are still much more expensive than getting traditional double glazing, which works out at about £300 per window on average.

Wooden and Timber Double Glazing. Wooden double glazed windows (also known as timber windows) are a popular option for traditional looking homes in the UK. New double glazed wooden windows will help keep your home warm and insulated. Wood frames are a good insulator, durable and have a long life expectancy.