How to Replace Double Glazing Seals

Double Glazing Seals

Double glazing is only as good as the current quality of the installation, including the integrity of Double Glazing Seals. If the quality of any element of the unit has begun to deteriorate in some fashion, you’re going to see a significant drop in performance pretty quickly. The most obvious and noticeable damage to a double glazed installation is going to be the glass chipping or cracking. You’ll see this one pretty quickly, although it can be a little sneaky, so make sure you check for any chips regularly as they can quickly lead to cracks, and a chip is a lot easier to fix than a crack.

seals replacement

The other problem, more common and less easy to spot, is the rubber double glazing seals that surrounds the glass installation. Connecting it to the frame has started to fail. The real failing is when a unit has ceased to be an effective insulator and is the point when condensation can start to appear between the two panes of glass. Condensation appearing is a clear indication that the seal has failed. Luckily replacing the double glazing seals is one of the easier methods of ensuring that your window remains in good working order.

Replacing your double glazing seals is surprisingly simple but is generally best handled by a professional. There is also an argument that replacing the double glazing seals alone is only putting off the inevitable replacement of the entire unit. A broken seal, particularly one that has begun to cause condensation in the window, can indicate that the window itself has reached the end of its natural lifespan.

This is probably common in double glazing installations that were installed in the first major wave of double glazing back in the late 1980s to the early 2000s. uPVC installations, particularly installed during this time, will likely be reaching the point of needing replacing.

When attempting to replace the double glazing seals yourself, you must be certain of your capability to do it. If you’re not sure, we recommend hiring a professional. Doing any DIY activity without proper knowledge, tools or materials threatens to cause more harm than good. You could end up hurting yourself or damaging your property. Whilst initially it may seem like a money-saving measure, you may end up having to spend more money than you were planning in the first place, repairing the damage caused by the misuse of tools.

However, if you feel ready and prepared to take on the challenge, replacing the double glazing seals on your double glazed window is one of the simpler DIY repairs you can do! We’ve created a simple step by step guide that you can follow to get you through the process. Remember to make sure you have all of the right materials and equipment before you get started and that you feel confident to undertake the project.

Guide for Replacing Double Glazing Seals

Step 1:

Remove the rubber double glazing seal. This part is pretty easy, and you shouldn’t worry too much about the old seal since you’re going to through it out anyway, but taking it all out in one go instead of pulling it to pieces will certainly make it easier to make sure that you’ve pulled the whole thing out, rather than having left bits in.

You’ll want to pinch part of the double glazing seal. The middle at the bottom is generally best, and pull it off equally in both directions. If you’re having trouble, use a Stanley knife to get underneath it and get a better grip. Once you’ve got enough grip, just pull away, and it should come off pretty cleanly.

Step 2:

Once you’ve got the double glazing seal out, you’ll want to check that you haven’t left any bits of it in the window. Take a look at the double glazing seal and if any of it is broken or torn, then make sure no pieces got left behind during the removal.

You’ll also want to check that there are no other obstructions in the frame, such as melted uPVC or dirt, as these will make it difficult for your window to seal properly. Chip away at these to remove them before installing the new seal, and make sure your rubber seal can move around in its slot.

Step 3:

Once you’re sure that you’ve got the slot clear and the window is ready, start in the corner and insert the seal. It’s probably best to start with one of the top corners, as this will save you trying to balance the seal when you get up to them. Work your way along with the window frame, pushing the double glazing seal into place as you go.

Step 4:

Repeat step 3, fitting all the corners and sides of the rubber double glazing seal into the frame.

Step 5:

Once everything is in, check it over and make sure everything fits properly and there aren’t any gaps or oddities with the installation. If you’re happy, you’re done!

Replacing your double glazing seal will help keep your double glazing installation in good working order. The seal breaking is often the first sign that the window is entering its latter stages in life, and replacing the seal can be a good way to save yourself replacing the entire unit for the time being.

Here at Double Glazing on the Web, we make sure that our customers all understand everything there is to know about their double glazing installations so that they know what to do when they’re failing and what to buy when they’re looking.

We provide expert opinions, articles and competitive prices for double glazing from across the industry so that you have one place that you can go for all of your double glazing needs. If you want to start your quote today, please use our online pricing tool! We look forward to hearing from you!


Replacing the seal in your double glazed windows may be a powerful manner to increase their lifespan and preserve their insulating homes. While it is able to look like a daunting challenge, with the proper gear, materials, and a chunk of information, it could be an achievable DIY challenge. However, in case you’re unsure about your talents or encounter any difficulties, it’s constantly exceptional to seek advice from an expert to make sure the job is achieved successfully. By staying vigilant and addressing any issues along with your double glazing promptly, you can experience a more snug, energy-green home for years to come.


How often do I need to check my double glazed home windows for symptoms of wear and tear? 

It’s a good concept to investigate your double glazed windows as a minimum once a year to discover any capability troubles along with chips, cracks, or failing seals. This will let you address problems early on earlier than they worsen and require greater substantial repairs.

Can I replace the seal on my double glazed home windows if there is already condensation among the panes? 

While changing the seal may be a transient solution, if condensation has already fashioned among the panes, it’s likely that the window has reached the end of its lifespan. In this case, it may be more value-effective ultimately to replace the complete unit.

Is it important to lease an expert to update the seal on my double glazed home windows? 

If you are confident in your DIY competencies and have the essential gear and materials, changing the seal on your double glazed home windows can be a practicable project. However, if you’re uncertain or encounter any problems, it is always nice to hire an expert to ensure the job is accomplished efficiently and to avoid causing any damage to your windows or assets.

How can I inform if the seal on my double glazed window has failed? 

The maximum obvious signal that the seal in your double glazed window has failed is the advent of condensation among the 2 panes of glass. You can also note drafts or reduced strength efficiency in your house. If you believe you studied your seal has failed, it’s pleasant to deal with the difficulty right away to prevent in addition damage.

Are there any preventative measures I can take to lengthen the life of my double glazed windows? 

Regular upkeep, along with cleansing the frames and making sure the drainage holes are clear, can assist extend the lifestyles of your double glazed windows. Additionally, keep away from setting heavy gadgets or furniture close to the home windows that could put useless stress on the seals. If you stay in a place liable to extreme climate conditions, don’t forget installing typhoon shutters or different shielding measures to reduce damage on your home windows.

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