Failed Double Glazed Windows (How to know your double glazing has failed)

When you work with KLIC Home, you work with a team of home improvement providers that offer quality products installed professionally. One of our most popular services is our double glazed windows. 

Unfortunately, not every window installer out there takes the same care as we do when choosing appropriate windows and installing them, meaning sometimes your double glazing can fail. And sometimes double glazing will simply fail due to its age. Whatever the cause, when this happens, it’s usually time to replace your windows or seek window repairs from the pros. 

Below we’ll look at how to know your double glazing has failed so you can respond appropriately.

Signs Your Double Glazing Has Failed

Your double glazing may have failed if you notice:

  • cracks or chips
  • condensation 
  • draughts 
  • leaks


Issues Things To Look Out For
Cracks or chips This one is a pretty obvious sign that your double glazed windows have failed. Large cracks are a major concern and you’ll need to remedy the issue quickly (we’ll tell you the best course of action below). Smaller chips may not be immediately noticeable, so if you notice any of the issues below, inspect your windows more closely for signs of chips or smaller cracks.
Condensation Condensation on the inside or outside of your windows aren’t such a major concern – in fact, condensation on the outside of your windows are a sign your windows are working effectively, and inside it’s usually just related to temperature changes between the cold windows and warm room. When condensation forms between the two panes, though, that’s usually a sign you’re dealing with failed double glazed windows.
Draughts Draughts can be deceptively difficult to identify, especially if your double glazing has failed during the winter months. If you notice that you’re putting your heating on higher or for longer than you normally would to feel warmer in a room, then it might not be due to falling temperatures outside. Place your hand near your windows – if you feel cold, then the double glazing may have failed.
Leaks Again, leaks are obvious if the problem is major. However, don’t be confused by condensation on the inside of your window – this may look like a leak, but it’s a natural process that’s nothing to be concerned about. If there is water around your window sealant or weather seals that isn’t related to condensation, then you’ll need to address the issue.


How Do I Fix Cracked or Chipped Double Glazing?

If you notice larger chips and cracks that have physically broken the barrier between one of your glazing panels and your room inside or world outdoors, then you have a serious issue. 

Double glazing has insulating gases between the two panes which helps stop the passage of cold air from outside in, and warm air from inside out. Our KLIC double glazing windows are all designed to keep your home as comfortable as possible – if cracks or chips have caused your windows to fail, then your comfort will be compromised. 

Repair or Replace?

Your only option here is to replace your cracked or chipped windows with new double glazing options

Click to browse KLIC’s double glazing range

What Do I Do If I Notice Condensation Between The Two Panes Of My Double Glazed Windows? 

Condensation between the two panes of your double glazing is a serious issue – there’s no doubt that your windows have failed here. 

The insulating gases between the panes should stop condensation from forming here. If condensation has formed, then the gases have been lost due to a major failure, and your window’s energy efficiency will have dropped. 

Repair or Replace?

You’ll need to replace any windows with condensation between the two panes because their energy efficiency has been compromised and can’t be fixed.

Out with the old and in with the new? Why not consider KLIC’s Window Recycling Scheme and save up to £2,500 on the cost of your new windows with us?

Do I Need To Replace Draughty Double Glazing? 

Draughts are usually caused by weather seals or the sealing around your window frames and wall failing over time. If you’ve had your windows for a while, this isn’t unusual, and so long as the rest of your window is intact and doing its job effectively, draughts aren’t necessarily window-ending. 

Repair or Replace?

Repairing draughty double glazing is possible – in most cases it’s a DIY job too. All you’ll need to do is replace the sealing where you feel the draught to secure your home against the cold outside air.  

Can Leaky Double Glazed Windows Be Repaired?

If you notice a leak around the frame of your windows, then it could be a sign that your weather seals have failed. When operating as expected, weather seals are designed to stop the outside weather from making its way inside your home. When they fail, you may notice leaks around your window frames. 

If your windows are especially old, then the sealant between your windows and wall may also have failed. This isn’t a problem if your windows are otherwise working well, but if there are any other signs of issues such as the ones mentioned above, then repair may not be possible.

Repair or Replace?

If your windows are otherwise in good condition, then leaky double glazed windows can usually be resolved with some new sealant or weather seals. 

If, however, you have old windows that are in need of replacement, then you can find them with KLIC Home Improvements.

Failed Double Glazed Windows: How To Know Your Double Glazing Has Failed Summary

When your double glazing fails, you are often left with only two choices: repair or replace. Deciding which is the right course of action can be tricky, but a lot of the time your damaged windows will make the decision for you. 

If you think your double glazing has failed and you would benefit from the professionals taking a look, then get in contact with us today.

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