How Long Does Double Glazing Last?

An average house loses roughly 10% of heat through doors and windows. Installing energy efficient double glazing goes miles to reduce this heat loss. It not only reduces your heating bills but also mitigates the heat loss and most importantly blocks the outside noise.


Double-glazed windows feature two glass sheets with a gap in between them. The gap, that is normally 16mm, creates an insulating barrier to reduce the rate at which heat disappears from your home. Today, triple-glazed windows are available. They feature three sheets of glass meaning they have two insulating gaps to offer even better insulation.


What is the lifespan of Double Glazing?

Typically, the lifespan of double-glazing is approximately 20 years. Nevertheless, this can vary from roughly 10 – 35 years. It all depends on factors such as:

  • Location of your windows
  • Workmanship of installation
  • Quality of materials
  • Temperature differences

Do all Double-Glazed Windows have the Same Lifespan?

No. Not all units have the same lifespan, even if they are all from a similar double glazing company. Based on the previously listed factors, some units may last for as little as 10 years while others can remain intact for far longer than the usual 20 years.

Consequently, depending on the manufacturer, companies will normally issue a warranty of 10 – 20 years.

DGU’s longevity can also be affected by its location within your home. For instance, if the windows are south facing it increases the chances of them lasting between 10 and 12 years.


How Wear and Tear Affects Double Glazing Units?

With time, double glazed windows might suffer from some wear and tear as well as all kinds of minor damages. According to the Centre for Sustainable Energy, when roughly 25% of all the gas has evaporated, the window’s thermal performance is reduced.

Another issue that you will have to grapple with at some point is condensation. The wear and tear of the unit will cause a break in the seal of the window allowing external air to enter the window cavity and then the moisture within the air collects between glass layers. Condensation can also take place when the desiccant within the window becomes saturated.

Most definitely, the ravages of time can take a toll on double glazed windows too. A common way that this happens is when huge temperature differences between the inside and outside surfaces of the DGU stresses the spacer adhesives, which can cause it to fail. When the gap between glass panes within a DGU is smaller, the more susceptible it is to this type of issue.


In Summary

In summary, top-notch quality double glazing units that have been installed properly and given appropriate maintenance should last two decades if not more. A trustworthy company with excellent service ought to give you the utmost peace of mind with a warranty that covers your entire investment for a major part of its estimated lifespan. Once it is past that, you have a variety of options for handling any issues, which might crop up.