If you’ve ever noticed your double glazing looking foggy or misted up inside, you’re not alone. Condensation between double glazing panes is one of the most common issues homeowners face, especially in older windows. It not only spoils the view but can also indicate a bigger problem with the unit itself. Understanding what causes it can help you decide whether your windows can be repaired or need to be replaced.
At RPS Double Glazing Repairs, we’ve helped countless homeowners across Dorset and the surrounding areas restore clarity and comfort to their homes. Let’s take a closer look at what’s really going on when condensation appears between the panes.
Double glazing works by sealing two panes of glass together with a spacer, creating an insulating air gap in between. This sealed unit helps to reduce heat loss, cut down on noise, and improve energy efficiency. However, once moisture finds its way inside that sealed gap, it becomes trapped. The result is the misted or foggy appearance that so many people recognise.
There are actually three types of condensation that can affect double glazing: internal, external, and inter-pane. Internal condensation appears on the inside of the window, usually due to excess humidity within your home. External condensation forms on the outside surface of the window, often on cold mornings when the glass is cooler than the surrounding air. The most problematic type, and the focus of this article, is inter-pane condensation, which happens between the two sheets of glass inside the sealed unit. This is a clear sign that the seal has failed and moisture has entered the space that should remain dry.
There are several tell-tale signs that your double glazing has failed. The most obvious is the cloudy or misted appearance between the panes. You might also notice draughts, difficulty maintaining room temperature, or higher energy bills due to reduced insulation. In some cases, water droplets may even collect at the bottom of the glass unit.
You can also look for visible damage to the seals around the window edges or listen for rattling noises in windy weather, which could indicate loose or worn components. If you suspect your double glazing is failing, it’s always best to act quickly. The longer moisture is left trapped inside, the more damage it can cause to the frame and surrounding materials.
Many homeowners assume that once their double glazing becomes misted, replacement is the only option. Thankfully, that’s not always the case. At RPS Double Glazing Repairs, we specialise in repairing failed double glazing units wherever possible. By replacing the damaged seals or fitting new glass units into existing frames, we can restore the window’s performance without the need for a full replacement.
Repairing rather than replacing offers several benefits. It’s more cost-effective, quicker, and better for the environment because it reduces waste. Whether your issue is caused by a failed seal, a broken spacer, or trapped moisture, our experienced technicians can diagnose the problem and recommend the best solution.
While some causes of condensation are inevitable as windows age, there are a few simple ways to reduce the likelihood of it happening again. Regular maintenance is key check your window seals annually for signs of wear or gaps. Keep your home well ventilated, especially in areas like kitchens and bathrooms where humidity levels are high. Using a dehumidifier can also help control excess moisture in the air.
It’s also a good idea to have your windows inspected periodically by professionals. A quick check-up from RPS Double Glazing Repairs can catch small issues before they become major problems, saving you money and hassle in the long run.
Can condensation between panes be repaired?
Yes, in many cases it can. The team at RPS Double Glazing Repairs can often replace the failed sealed unit or reseal the existing frame, depending on the condition of the window.
Why does condensation appear even after cleaning the windows?
If the condensation is between the glass panes, cleaning won’t remove it because it’s trapped inside the sealed unit. This is a sign that the seal has failed and moisture has entered the space.
How long do double glazing units last?
On average, a well-installed double glazing unit lasts between 15 and 20 years, though this can vary depending on climate, quality, and maintenance.
Is it worth repairing misted windows?
Absolutely. Repairing is often more affordable and environmentally friendly than replacing the entire window. It can restore clarity and insulation quickly and efficiently.
Condensation between double glazing panes is a common issue, but it doesn’t have to spoil your comfort or the appearance of your home. Understanding what causes it helps you act quickly and choose the right solution. With expert help from RPS Double Glazing Repairs, you can enjoy clear, energy-efficient windows once again.