Everything You Need to Know About Replacing Window Seals.

Your home’s windows serve as a crucial barrier against the elements, and one of the keys to maintaining their efficiency is the window seal. Over time, UPVC window seals (also known as window gaskets) can deteriorate leading to drafts, condensation and reduced energy efficiency. Replacing window seals is a relatively simple and cost-effective DIY project that can make a significant difference in your home’s comfort and energy bills. In this guide, we’ll tell you how to tell if a window seal is broken and everything you need to know about window gasket replacement.

Understanding UPVC Window Seals

The UPVC windows in your home are known for their durability and energy efficiency. The seals on these windows, usually made of rubber, play a vital role in maintaining their performance. New window seals are flexible and will retain their shape after being compressed by the window These seals create an airtight barrier that prevents draughts and moisture from seeping into your home.

Do Window Seals Need Replacing?

As time goes by, UPVC window seals may wear out, crack, or lose their elasticity due to exposure to the elements and general wear and tear. When this happens, it’s essential to replace window seals to maintain the energy efficiency of your windows.

Can I Replace Window Seals Myself?

Yes you can absolutely replace window rubber seals yourself as the process is quite straightforward and doesn’t require too much experience or effort. Most rubber seals are easy to pull out without tools / professional help letting you to push in a new one into the existing notches as long as it’s appropriately profiled and sized. 

How to Tell if a Window Seal is Broken?

Recognising a broken window seal is crucial for maintaining the energy efficiency of your home. Here are some common signs that can help you determine if a window seal is compromised:

Condensation Between Panes

One of the most noticeable signs of a broken window seal is the presence of condensation or fogging between the two panes of glass in a double-glazed window. This occurs when the seal that holds the air between the panes fails, allowing moisture to enter. When this happens, it’s time to reseal double-glazing.

Draughts or Air Leaks

If you feel draughts or air leaks around the window frame, it’s a strong indicator that it’s time for UPVC window seal replacement. Hold your hand near the edges of the window and check for any noticeable temperature differences.

Visible Cracks and Damage

Inspect the window frame and seals for any visible cracks, gaps or damage. Cracked or deteriorating seals can allow air and moisture to enter which will affect the window’s insulating properties. 

Water Stains or Mould

If you notice water stains or mould on the window frame or adjacent wall, it could be a sign of a broken window seal. Window rubber seal replacement will stop moisture from entering through the compromised seal which can lead to water damage and mould growth over time.

Increased Energy Bills

A sudden increase in your heating bills may indicate that your windows are no longer providing proper insulation. If you rule out any issues with your windows, then it’s also worth looking at your window gaskets. Damaged window seals can lead to reduced energy efficiency, causing your heating system to work harder to maintain the desired temperature.

Difficulty Opening or Closing

If you find it increasingly difficult to open or close the window, it could be due to broken window seals. Warped or damaged seals may affect the window’s operation.

Visible Seal Deterioration

Inspect the UPVC window seals for signs of deterioration. Seals are typically made of rubber that can degrade over time. Look out for cracked, peeled or flattened seals or other signs of wear and tear.

Increased Sound Transmission

Can you hear external noises louder than before? If you notice that noises from outdoors penetrate your windows more easily than before, it may indicate a compromised window seal. Resealing double-glazed windows can increase their ability to block sound.

How to Replace Window Seals

When it comes to replacing window gaskets, the task is easier than you might think. Before you start you’ll need a few supplies to ensure your replacement window seals are fitted properly:

• A pair of scissors
• A clean cloth
• Soapy water
• A high-quality replacement window gasket. Be sure to select the correct window seal for your home. JA Seals supplies premium E-gaskets, Bubble gaskets and wedge gaskets, contact our team if you’re unsure of the type of seal you need.

Remove the Existing Window Gasket

Carefully peel away the old window seal. Be cautious not to damage the window frame during the process. If the old seal is stubborn or deteriorated, take your time to remove it without causing any damage to the window frame.

Clean the Window Frame

Using a damp cloth and soapy water, clean around the window to remove any dirt, grease and debris. Ensure the area is clean and dry before applying the new gasket.

Installing the New Seal

Starting at the top and centre of the window, begin squeezing the seal into place along the top and down the sides of the window frame. Continue working your way along the window right up to the starting point. Cut the seal so there is no gap between the start and the end of the seal.

Test for Effectiveness

You can perform a simple test to ensure the effectiveness of your new window gasket. Close the window and check for any draughts, moisture or gaps. If you notice any issues, double-check your seal to be sure that it is fitted correctly.

Can You Replace Seals on Double Glazed Windows?

You can definitely replace seals on double glazed windows and it is a task you can complete yourself with a little bit of patience as having this done professionally can be costly. Before getting started, you’ll need to identify which seal it is that needs to be replaced:

• The frame / opening seal: This is the rubber strip between the opening window (sash) and the outer frame of the window. If there’s a draught or there are any gaps visible when you close the window, it means this is the seal you’ll need to replace.
• The glass beading seal: This is the gasket between the glass pane and the frame and the way you’ll know if this is the one that needs replacing is if the rubber is visibly shrinking or cracking which in time can cause the double glazing to ‘blow’ (cause permanent condensation between the two panes)

Once you know which seal you’re replacing, you can follow the usual steps for replacing window seals:

1. Find the right seal profile for your window. JA Seals have a wide range of replacement window seals in various profile types and sizes and if you’re not sure which product will best fit your window, just give our team a call and we’ll be happy to help.
2. Pull out the old seal out of the tracking groove and clean up the area using a damp cloth.
3. Install the new seal starting either from the middle or a corner of one of the sides and press into the groove using your fingers or a flat object (not sharp).
4. Cut small ‘v’ shapes where the corners are so you don’t stretch the gasket across but instead it bends without kinking.
5. Work your way around the window until you reach the starting point.

Will Resealing Windows Help With Condensation?

Absolutely. Since broken or worn out seals allow moisture to enter which is typically the main reason why condensation happens in the first place, replacing window seals and installing fresh, quality gaskets will definitely help minimise if not completely stop it from forming. The new seal will restore an airtight barrier which means moist air won’t be able to enter, cool and turn into water. It’ll also stop draughts thus keeping the surface of the window warmer so moisture doesn’t form between the panes / on the glass surface. 

How Often Should Windows Be Resealed?

When it comes to resealing windows, the frequency varies depending on factors such as climate, initial seal quality and maintenance. Generally, inspecting the seals annually will help you catch issues as they arise; however, windows in extreme climates may require more frequent resealing. Investing in high-quality replacement window gaskets and proactive maintenance can extend the time between resealing, which is typically recommended every 5-10 years.

Get Replacement Window Seals From JA Seals

JA Seals supplies a range of replacement window seals to help you upgrade your home’s windows. Whether you need bubble gaskets, E-gaskets or wedge gaskets, our high-quality window seals are easy to fit meaning you can replace your seals with ease. For more information browse our selection of window seals or contact our team if you need help choosing the right seal.

Enquire Now!

Sign me up for deals and offers

* denotes a field that must be filled in before the form can be submitted.