Also referred to as insulated glazing, double glazing is the process in which doors and windows are formed from panes of glass with a layer of gas sealed between them to form a layer of insulation. In cheap glazed units, the gap may be filled with ordinary air, but in more efficient units gases such as Xenon and Argon are used to provide exceptional performance. The sealed unit is designed to reduce heat and noise conduction, resulting in more benefits than standard glass units. Some of the common benefits of double glazing include:


Double glazed windows insulate your home against extreme temperatures by keeping the heat out in summer and retaining a higher percentage of sun rays during winter. This eliminates the need for heating and cooling systems which are often not pleasant to many people due to dust and noise annoyances.


Condensation occurs when warm air cools down to form moisture which accumulates on glass objects to form a significant amount of water that can damage buildings. When a window or door has single glazing, the cool temperatures on the outside are easily transferred to the inside and when this occurs, the moisture may trickle down and destroy wooden window frames, walls or act as breeding ground for mold. The inert gas found in double-glazed units eliminates this problem through ensuring that the inside glass is kept at room temperature to prevent moisture formation.


Double glazing is made from glass combinations that limit the transmission of ultraviolet rays to the room, reducing the possibility of the sun damaging furniture, paintings and other objects within the house. When a tinted glass is used on the outside of the door or window, the transmission is further eliminated by almost 100 percent.


Glass units provide a channel for noise to penetrate into buildings, and this can affect comfort, concentration and efficiency of individuals located in a high populated area or near a busy road. Glazed units carry soundproofing capabilities which provide added insulation against outside noise creating a calmer, quieter environment. It also minimizes the noise levels within your home, so you do not have to worry about disturbing your neighbors.


Because of their tight sealing, double-glazed units are more difficult to break than single glass units. Even when broken the fragments remain in place protecting the home from intruders. Safety can be increased through the use of toughened or laminated glass material.


Double glazing increases the lifespan of doors and windows, and because there is less need for heating systems, energy consumption is greatly reduced, resulting in less power usage. The units also contribute to a reduction in greenhouse emissions, improving the energy rating assessment within your home.


Double glazing units increase the resale value of older homes. Most buyers prefer houses that are efficiently insulated and rarely go for those with single glass units.

Double glazed units are available in different materials and homeowners make selections depending on budget constraints and how much maintenance is required. The most common window frame for such units is uPVC, which is not only cheaper than traditional wooden frames but also durable, recyclable and easy to clean.

We’d like to thank FAB Systems Ltd for their help when we were researching this topic. They provide double glazing in Stoke on Trent.