Double glazing is a great way to keep your home warm, cut down on energy bills, and reduce noise. But when it starts misting up, it can be a real headache. Those cloudy patches between the glass not only ruin the view but also make your windows look worn out. So, what can you do when your double glazing starts to mist? Here’s a straightforward guide to help you get your windows clear again.
Why Does Double Glazing Mist Up?
Double glazing works by having two panes of glass with a space between them. This gap is filled with an insulating gas, like argon, which keeps your home warmer. But over time, the seal around this gap can break down. When that happens, moisture can get inside, leading to misting. Common reasons for misting include:
- Seal Failure: The seal around the glass wears out due to age or poor installation.
- Weather Damage: Extreme temperatures can cause the seal to expand and contract, eventually breaking it.
- Poor Installation: If the windows weren’t fitted correctly, the seal might never have been properly airtight.
How Can You Check If Your Double Glazing Is Misted?
Sometimes, it’s not always obvious if your windows are misted. So how can you be sure?
- Look for Condensation: If there’s mist or water droplets inside the two panes, that’s a sign of misting.
- Foggy Appearance: If your window looks cloudy or dirty no matter how much you clean it, that’s a strong indicator.
- Cold Spots: If the area around the misted window feels colder than others, it might be because the insulation has been compromised.
Can You Fix Misted Double Glazing Yourself?
When you notice misting, your first thought might be to try fixing it yourself. While it’s possible in some cases, it depends on how severe the problem is. Temporary Solutions You Can Try:
- Use a Moisture Absorber: Placing a moisture-absorbing pack near the window can help, but it won’t fix the problem permanently.
- Silica Gel Packs: These are the little packs you often find in new shoes or bags. They absorb moisture, so placing them near your window might help a bit.
- Heat the Glass Gently: Using a hairdryer on a low heat can sometimes help remove moisture from the surface of the window. But be careful not to damage the seals further.
These are temporary fixes at best. They might clear up the mist for a short while, but they won’t address the root cause of the problem.
What Are the Best Long-Term Solutions?
If you want a proper fix, you’ll need to take a more serious approach. There are a few long-term options: Resealing the Double Glazing If the seal has failed but the glass is still in good condition, you can try resealing it. This involves:
- Removing the window panel from the frame.
- Cleaning the inside of the glass.
- Reapplying a new seal around the glass.
- Refitting the window panel.
This can be done by a professional or, if you’re confident, you can try it yourself. Just be aware that it requires some skill. Replacing the Glass Unit If the glass is badly damaged or the misting is severe, it’s often better to replace the whole glass unit rather than trying to repair it. This means keeping your existing frame but having a new, properly sealed glass unit fitted inside. Professional Demisting Services There are companies that specialise in demisting double glazing. They use a method where they drill a small hole in the glass, extract the moisture, and then reseal the unit. This can be a more affordable option than a full replacement.
Should You Replace the Entire Window Frame?
Not always. If your window frames are in good condition, there’s no need to replace them. Most of the time, it’s just the glass unit that needs attention. But if your frames are old, damaged, or rotting, it might make sense to replace the entire window.
How Much Does It Cost to Fix Misted Double Glazing?
Costs can vary depending on what you choose:
- Resealing the Glass: This can cost anywhere from £50 to £100 per window, depending on the size.
- Replacing the Glass Unit: Prices start at around £80 for a small window but can go up to £200 or more for larger ones.
- Professional Demisting Services: These can cost between £40 and £100 per window.
- Full Window Replacement: This is the most expensive option, costing anywhere from £200 to £600 per window.
Can You Prevent Double Glazing From Misting Up?
The best way to deal with misted windows is to prevent the problem in the first place. Here are some tips:
- Regular Maintenance: Check the seals on your windows once a year.
- Ensure Proper Ventilation: Make sure your home is well-ventilated to avoid excess moisture building up.
- Avoid Harsh Cleaning Products: Some chemicals can damage the seals around your windows.
- Choose High-Quality Windows: If you’re installing new double glazing, opt for high-quality units with durable seals.
When Is It Time to Call a Professional?
If you’ve tried temporary fixes but the misting keeps coming back, or if the misting is so bad that you can barely see through the window, it’s time to call in a professional. They’ll be able to assess the problem properly and recommend the best solution.
Is It Worth Repairing Misted Double Glazing?
In most cases, yes. Repairing misted double glazing is usually cheaper than replacing the entire window, and it can restore the energy efficiency and appearance of your home. However, if your windows are very old, it might make more sense to invest in new, modern, energy-efficient units.
Final Thoughts
Misted double glazing can be an annoying problem, but it’s not the end of the world. Whether you choose to reseal the glass, replace the unit, or call in a demisting service, there are options to suit every budget. The key is to act sooner rather than later. The longer you leave it, the worse the problem can become. Remember, keeping an eye on your windows and doing some basic maintenance can prevent misting from happening in the first place. But if you do end up with misty windows, you now know exactly what to do.
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