What is a Double Glazed Window


Double glazed windows are insulated glass units (IGU). The IGU has several glass panes in the one window system. These are generally double glazed, that is, with two panes of glass. A still layer of gas or air and a spacer separate the glass panes in these systems. Did you know that all windows should be double glazed?

Are double-glazed windows worth it?

When double glazing windows are installed, some of the heat from the glass is lost to the surrounding environment and the windows become cold. When there are windows in a room that does not have winter heating installed, the space will get cold even when it is only 10°C. Double glazed windows help to combat this issue because there are multiple layers of insulation. Double glazed windows keep heat in. What is heat? In very simple terms, heat is a measure of the heat in a material. So the more heat is contained within the material, the warmer it is. If there is not enough heat in a material to maintain a comfortable temperature, that is called thermal degradation. This can lead to sagging in the window frames, or even rot.

Double glazed window benefits

A double glazed window helps to reduce noise by blocking out light. This is because the windows form a barrier to sound waves. A double glazed window also helps to reduce heat by blocking heat radiated through it. In some instances, double glazed windows can help reduce noise by 10 dB. Double glazed windows block out light and heat. The windows are usually between 3-8mm thick and have a heavy or double set of panes. The double panes form a barrier to sound waves and prevent heat radiation. Also, the double panes create a layer of gas or air to protect the glass from shattering and reduce heat radiation. The double glazed windows provide sound insulation between the panes. A good double glazed window will typically have a rating from 90 dB to 110 dB depending on the application.

Double glazed window disadvantages

1. It is energy inefficient Double glazed windows are great at blocking out the cold and letting the warm air in, but it takes a lot of energy to make the IGU. A double glazed window will decrease the amount of cooling and heating you use, and it will increase the amount of heating you use. You don’t just think the IGU is heating, you feel it. Double glazing is also a relatively high energy consumer.

2. It costs more. Double glazed windows are expensive. They cost about double the amount of a regular window. This may not be a big deal if you want to spend all your money on other things. If you have a mortgage, a renovation budget, or a family to care for, this is something you will need to take into consideration.

Can You Replace Broken Double Pane Window Glass

The answer to this question is technically yes, but it may not be the best idea. You can lose significant energy savings by replacing a single pane in a double-paned window. Seals can be damaged during the replacement process, resulting in less efficient windows. Any gas injected between the panes to make them more efficient will escape, again reducing efficiency. t is possible to cause further damage to the sash and the window itself when replacing the single pane of a single window. The replacement process can even be damaged in the process.
Additionally, the amount of work required to do window glass replacement on a double pane is more labour intensive so is also likely to be more expensive.


Depending on the type of heating and the size of the house, it can be difficult to achieve optimal winter heating with natural gas. Windows are the most important factor in heating efficiency and, therefore, in the fuel usage. Glazed windows allow the full effect of sunlight in summer and block it during winter. In addition, insulation of a glazed window unit is essential. It is recommended that insulation should consist of low-efficiency insulation, which will reduce the heat loss of the glazed window system.

About the Author
Marc Gombi

Marc Gombi

Marc is an experienced glazier providing high quality glass replacement and repair in Sydney Lower North Shore.

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