Does a vacuum exist in double glazing?

A great thing about sash windows is you can usually get double glazing or secondary glazing to improve energy efficiency. Something people often wonder about the former is whether there is a vacuum in the units. We want to take a look at this today, then if you need sash window restoration in Northumberland, you can rely on us.

The short answer here is no. Some people get confused because there is vacuum double glazing. However, that is a specific type and refers to the insulation. There isn’t a vacuum in standard units, whether they are for wood or uPVC windows.

How does everything work?

Sash window restoration NorthumberlandNormal double glazing consists of two glass panes, divided by a spacer. Said spacer is full of gas or air. It functions as an insulator that keeps heat from getting out via the windows. The unit can minimise heat loss by up to 50% if you compare to single pane windows.

The vacuum double glazing has more efficiency. It transmits less heat if you compare to units with gas or air. So, it can save even more on energy bills.

Let’s say you have single glazing and you want to lower your energy costs and make things comfortable. Double glazing should be a consideration for you. Don’t rush to fully replace your window though. You can retrofit new slim double glazing into many wooden window frames. This is possible even with older and weaker looking windows. If you need the best services for sash window restoration Northumberland has, get in touch with us.


Next, we will go over why we fill double glazing with gas. The gases in the units are chosen because they do an excellent job at preventing heat from passing through them. What’s more, they are inert. So, they won’t react with your glass or any other materials within the window. This makes them stable and safe for long-term usage.

The most common gas for double glazing is argon. It’s cost efficient and does a decent job insulating against heat loss. Xenon and krypton cost more money. However, they are even better at stopping heat transfer. There’s something to keep in mind though. The costs for these windows can be substantially higher than standard double glazing.

Vacuum double glazing

As we said above, this style has higher efficiency if you compare to normal double glazing. A vacuum doesn’t transmit as much heat as gas or air. The upfront costs of these windows can exceed normal designs, but they will help to lower your bills.

Another fact about vacuum double glazing is that it comes with a longer service life than normal units filled with air or gas. They tend to be thin too. As a result, you may be able to use it to replace older single glazing sash windows on UK heritage structures.

Let us handle your issues with sash window restoration in Northumberland

At David Humble, we focus on making our work efficient and quick. Thanks to our perimeter sealing system, this is possible. It allows us to repair your property from the inside. There is no need to waste time or risks using a ladder to go up and down.

So, if you are interested in the leading services for sash window restoration Northumberland has, let us know. We can arrange everything with you, including upgrading to double glazing.