Double Glazing vs. Triple Glazing Skylights

Modern double or even triple-glazed roof windows are more expensive than old single-paned windows, but when you compare their performance and the benefits these options offer, it’s easy to realise that buying them is simply a much better investment. But now you have another choice in front of you. Double vs. triple glazing – which windows are the best for you? Are there even any significant differences between the two? And if so, what are they?

Barn with skylights windows

Why is glazing important?

Before we try to explain the differences between double-glazed rooflights and triple-glazed rooflights, it’s important to show why replacing your old windows with one of these options is beneficial for your home and your finances. Without going into too much detail, we can simply point to their thermal performance and increased property value as two main things to pay attention to.

What can you gain by replacing your windows?

Ensuring better insulation means that you can reduce your energy consumption and, in effect, lower your energy bills. Well-insulated windows serve as a barrier between the warm air inside of your home and the cold air outside of it. But that’s not all, double and triple-glazed windows can also keep the noises at bay, thus increasing the comfort of your house even more. Multiple glazing is also a good solution when it comes to problems with condensation.

How does multiple glazing work?

To give the simplest definition, double-glazed windows consist of two glass panes joined together into one sealed unit with the space between filled with an insulation gas. This structure is the main reason for the energy-efficient properties of such windows and helps to reduce the heat loss of your house. In the case of triple-glazed windows, the structure is very similar, but as the name suggests, they have one more pane of glass added to them for even better insulation.

Double or triple glazing – which option should you choose?

At this point, it might seem natural to assume that choosing a triple-glazed skylight for your loft conversion project is simply the best possible option, however, that’s not necessarily the case. For starters, a lot will depend on the quality of the roof window you buy. There’s a chance that a well-made double-glazed unit from a trustworthy manufacturer will be able to perform significantly better than many triple-glazed options out there.

But when comparing two high-quality options, triple glazing will be better at:

  • reducing the heat loss,
  • blocking noises,
  • preventing your loft from overheating.

Yet, it’s not all about the benefits – there are downsides as well. The main two worth mentioning are:

  • due to the addition of another glass pane, triple-glazed windows are heavier, so there’s a chance you’ll need to strengthen your roof before the installation,
  • such roof windows are simply more expensive. That’s why it’s important to consider whether the savings you can gain are worth investing in triple glazing – there’s a chance that in your situation double glazing will be simply more beneficial.


People Also Ask:

Is triple glazing better than double glazing?

It’s true that triple glazing performs better because it’s more energy efficient and ensures better insulation. However, it is still worth considering double glazing for your roof windows - it offers good insulation as well, and there’s no denying that it is cheaper

Can I replace double glazing with triple glazing?

Yes, it’s generally possible to replace double0glazed windows with triple-glazed ones. However, as they are heavier, it’s always important to check first whether your roof will be able to withstand the added weight.