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What is Double Glazing & How Does it Work?
Lifestyle
Double glazing has become the top choice for homeowners across the UK and beyond, with a global market worth a whopping 20.8 billion. Offering better insulation, more comfort, and long-term savings, it’s easy to see why double glazed windows and doors are so popular.
But even with all the buzz, you might still be wondering: what is double glazing, and how does it actually work?
With almost 2 decades of industry experience here at Express, we’re ready to explain it all. In this blog, we’ll break down how double glazing works and the many benefits it can bring to your home.
The Origins of Double Glazing
Double glazed windows first appeared in Victorian Scotland, designed to tackle the harsh, windy winters. The idea of using multiple layers of glass for better insulation dates back to the 1860s when Scottish scientist Thomas Young experimented with trapping air between two panes to improve heat retention. Though the concept existed, it wasn’t until the 1930s that double glazing was commercially patented in the US by CD Haven under the name Thermopane. At the time, it was considered a luxury due to its high cost.
By the 1980s, prices had dropped, making double glazing far more accessible. Its popularity grew rapidly in the UK and worldwide, offering a much better alternative to single glazed windows, which, while blocking out wind, often struggled with condensation and mould. As of January 2025, double glazing reduces heat loss by up to 60% more than single glazing, which is why it’s now a standard feature in most homes, with continuous improvements being made to boost energy efficiency and overall performance.
How Does Double Glazing Work?
The process behind double glazing, or insulating glass, is straightforward but highly effective. Two panes of glass are cut to size, with a spacer bar placed between them to create a sealed gap. This gap is then filled with air or an inert gas, both of which are poor conductors of heat, helping to reduce heat loss and improve insulation.
When paired with thermally broken aluminium frames, modern double glazing is not only energy-efficient but also built to last. But the real magic happens when you consider all the additional benefits it brings. Let’s explore some of the key advantages of double glazing that can make a significant difference in your home…
The Benefits of Double Glazing
Energy Efficiency & Reduced Carbon Footprint
One of the standout benefits of double glazing is its ability to improve insulation, which in turn boosts energy efficiency. The two panes of glass, separated by air or gas, create a barrier that helps keep your home at a comfortable temperature. This means less need for heating in winter and air conditioning in summer, making it both a cost effective and eco friendly choice.
For even better efficiency, pairing Low-E coatings with aluminium doors and windows can reduce heat transfer by 30-50%. And at Express, we take it a step further with a warm edge spacer bar, cutting heat loss by up to 94%.
If you’re upgrading from single glazed windows to double glazing, you could see some real savings. According to the Energy Saving Trust, UK homeowners could save up to £140 a year, with those in Northern Ireland saving up to £160. By reducing energy use, double glazing not only helps you cut down on bills but also shrinks your carbon footprint, making it a smart long-term investment with great return on investment (ROI).
Durability and Low Maintenance
Double glazed doors and windows are built to withstand all kinds of weather, making them incredibly durable. When paired with sturdy materials like thermally broken aluminium frames, they won’t warp or crack over time, saving you from the hassle of constant repairs.
Another big bonus? They’re low maintenance. Unlike single glazed windows, which can wear down faster, double glazing only needs the occasional clean to stay looking great. With fewer repairs and replacements to worry about, it’s a cost effective option that makes life much easier in the long run.
Reduced Condensation
If you’ve ever dealt with damp windows, you know how frustrating condensation can be. It’s a common issue with single glazing, often leading to mould and even structural damage over time. Double glazing helps tackle this by keeping indoor temperatures stable, which reduces moisture build-up.
Pairing double glazed windows with aluminium frames featuring a thermal break takes it a step further, cutting down condensation even more. At Express, our argon gas-filled sealed units are specially designed to keep condensation to a minimum. They meet all Building Regulations and boast impressive Window Energy Ratings (WER), thanks to their low U-value and high solar gain.
Want more tips on tackling condensation? Check out our previous blog [here]!
Improved Comfort and Aesthetics
No one likes draughts or chilly spots in their home, and double glazing helps put an end to them. By reducing heat transfer, it keeps the cold out and the warmth in, so your home stays comfortable all year round. Unlike single glazing, which can let cold air sneak through, double glazed windows and doors help maintain a steady indoor temperature, making every room feel just right.
But it’s not just about comfort; double glazing can also give your home a style boost. With a wide range of designs, frame materials, and finishes, you can find double glazed doors and windows to suit any property, whether it’s a modern build or something more traditional. From sleek aluminium windows to timeless classic frames, there’s something to match every taste.
Home Security & Privacy
Upgrading to double glazing is a smart move when it comes to boosting your home’s security. The dual-pane design makes your windows much harder to break, and if you want that extra layer of protection, you can opt for laminated glass. This type of glass has a Polyvinyl Butyral (PVB) interlayer that keeps shattered glass in place, making it much harder for anyone to break in.
But that’s not all – double glazing also helps reduce noise. The gap between the panes acts as an insulating barrier, dampening sounds from the outside. If you live in a busy area or near a noisy street, this is a game-changer for peace and quiet indoors. Overall, double glazing delivers the perfect combination of security, privacy, and tranquillity. It’s a win-win for any home!
Double glazing is much more than just a way to make your home more energy-efficient. It provides a wide range of benefits that contribute to both comfort and peace of mind. From reducing your carbon footprint to improving security and cutting down on maintenance, double glazing is a smart long-term investment.
Whether you’re considering upgrading to bifold doors, sliding doors, or aluminium windows, choosing double glazing helps you create a more comfortable, secure, and eco friendly home. If you’re ready to explore the best options for your home, why not take a look at our range of high-quality, thermally broken aluminium windows and doors? Visit our showrooms or browse our collection online today!
