Over time, the rubber seals on your uPVC windows can become worn, cracked, or compressed. When this happens, you may start to notice draughts, condensation, or water leaks. Fortunately, replacing the rubber seal on a uPVC window is a quick and simple DIY task that can restore your home’s insulation and energy efficiency.
In this guide, we’ll explain how to identify your existing gasket type, choose the correct replacement, and install it properly for the best results.
Understanding the Different Types of uPVC Window Seals
Before you begin, it’s important to know which type of gasket or seal your window uses. Most uPVC windows are fitted with either a bubble gasket seal or a wedge gasket seal, and some may use a combination of both.
Bubble Gasket Seal
The bubble gasket seal is the most common type found on uPVC windows. It features a rounded or oval-shaped bubble with an arrowhead base that holds it securely in place within the frame.
This seal runs around both the window opening and the edge of the glass, preventing draughts, noise, and moisture from entering your home. Replacing a worn bubble gasket can make a significant difference to your window’s insulation and comfort.
How to Identify the Correct Replacement Seal
Choosing the right replacement rubber seal is the most important part of the process. The fit needs to be snug enough to form an airtight seal but flexible enough to allow the window to close smoothly.
Here’s how to find the correct size and profile:
1. Remove a small section of your existing seal to examine its shape and size.
2. Compare it with replacement samples. At FixTrade.co.uk, we offer sample packs of uPVC window seals clearly labelled with product codes. This makes it easy to test different profiles and find the best fit.
3. Remember, your new seal does not have to look exactly like the original. The most important factor is that it fits securely and provides a tight seal against the frame.
4. Ensure the arrowhead section is large enough to stay firmly in place once inserted.
Testing different seal samples before purchase will save time and ensure a professional finish.
How to Remove the Old Rubber Seal
Removing the existing rubber seal is very straightforward.
1. Open the window fully to access all sides of the frame.
2. Grip the edge of the seal with your fingers and gently pull it away from the groove.
3. Continue working your way around until the entire seal is removed.
If the seal is brittle or stuck, you can use a small flat-blade tool to ease it out carefully. Be gentle to avoid damaging the frame or glazing.
How to Install the New Bubble Gasket Seal
Once you have the correct replacement gasket, installation takes just a few minutes.
1. Start at one corner of the window and press the arrowhead of the seal into the groove using your fingers.
2. Work your way around the frame, making sure the seal sits evenly without twisting or stretching.
3. For best results, install the seal in one continuous piece rather than several shorter lengths. This ensures a complete airtight fit.
4. Tight corners: If the corners feel too tight, carefully trim a small section of the arrowhead to help the gasket bend neatly into position.
5. Once fitted, close the window and check that it seals properly all the way around.
That’s it. Your new rubber gasket is now installed and ready to keep your home warmer and draught-free.
Why Replacing Window Seals Matters
Old or damaged seals can cause a range of issues, including:
• Cold draughts and heat loss
• Increased condensation on windows
• Higher energy bills
• Noise pollution from outside
• Difficulty closing the window properly
By replacing worn seals, you’ll improve insulation, reduce noise, and extend the lifespan of your uPVC windows. All at a fraction of the cost of replacement glazing.
Where to Buy Replacement uPVC Window Seals
At FixTrade.co.uk we supply a full range of bubble and wedge gasket seals for uPVC windows and doors. Our seals are available in different sizes and materials to suit all major window systems.
If you are unsure which seal type you need, order a sample pack to test various profiles before purchasing. All sample packs come clearly labelled, making it simple to find the right fit for your windows.
Replacing the rubber seal on a uPVC window is an easy and effective way to improve comfort, energy efficiency, and weather protection in your home. By identifying the correct gasket type, testing samples, and following simple installation steps, you can achieve professional results without the need for specialist tools.
For high-quality replacement window seals, visit FixTrade.co.uk and explore our wide range of bubble and wedge gasket options . Designed to help you stop draughts, reduce noise, and keep your home cosy all year round.