Can a Double Glazed Window Crack On Its Own?

Noticing a crack in your windows is never fun. While sometimes the double pane might be cracked by kids playing around and accidents happening, it could also be a structural concern with the house or a range of other causal factors leading to a break.

So, the reasons behind this are arguably worth exploring, and this guide takes a look at the most obvious things that could make it happen.

double pane window

Image credit: Alan Levine

What Is a Double Pane Window?

A double pane window is an investment people make for their homes to create a more energy efficient environment. They are two pieces of glass with either a vacuum space or an inert gas in the centre. Typically, this style of window is considered better than a single pane because it should be stronger, longer-lasting, and better at counteracting common glass issues. Therefore, for them to break, there generally has to be some underlying thing that causes it.

Read more: Common Issues With Double-Glazed Windows and How To Avoid Them

Reasons Why a Double Pane Window Might Crack on its Own

It’s not impossible for a double glazed window to crack on its own. Let’s explore the most common causes below to find an answer. 

Size and Shape of the Window

If a window is particularly tall or thin, it is more prone to breaking because the glass has increased flexibility and is therefore more vulnerable. Compare this to smaller sized windows, and there is a significantly lower break rate. The team at Britannia Glass Glazing can work with your measurements and mitigate the risk on bigger window frames. 


Temperature has a key role to play in the potential cracking of double glazed windows. Whether it is from central heating, a hot summers day, or even when the temperature drops, the double glazing might just suffer from spontaneous cracking. Thankfully, factors like the risk from central heating can be offset by providing interference objects between the window and the radiator, like curtains or a cover. 

An additional thought here concerns the temperature at the point of creation. For example, if a double glazed unit is manufactured on a hot day, the atmospheric pressure of the inert gas inside the panes can lead to a crack appearing when the weather turns cooler. So, there is a lot to think about here because some of it is down to chance and other things are easier to control. 

Manufacturing Problems

The creation of double glazed windows is highly specific and requires a certain skill set. There is always a chance that a human manufacturing error could be made or something else could go amiss during the production process. When this is the case, there is a good chance that the window will break because it was not formed correctly in the first place. 

Quality Control

Sometimes, a stress crack can appear because a window simply has not been made from good enough glass. When the products that make up the entire unit are subpar quality, the whole integrity is compromised. This is often the case when a price seems too good to be true or you go with a company that has a lack of reviews or a number of negative customer feedback responses. 

The biggest factor here is the type of desiccant used to mitigate the moisture inside a unit. When this is low-quality, it puts the structure in a worse position and leaves it vulnerable to humidity, causing a break. This is only really fixable by replacing the entire window for something that is made better with higher quality products and an enhanced manufacturing process. 

For a double pane window to crack without reason, it would be rare. There are typically contributory factors that lead to the break, as discussed in the post above.

If you have experienced damage to your doubled glazed window in London and need it repaired speak to Britannia Glass Glazing. We can help with any glazing emergency and operated 24 hours a day 7 days a week, so call us on 0203 305 7161 for a no-obligation quote.