Draught-proofing uPVC windows: 7 solutions that really work

Are you feeling a draught? Have you traced the problem to your uPVC windows? Then it may be time to upgrade your draught-proofing – or get a new set of windows entirely.

Of course, draughts are only a problem with old or inferior uPVC windows. One of the main draws of uPVC as a material for window frames is precisely that it's durable and draught-resistant.

But you may have an old window that's starting to show signs of wear and tear. If so, there are several steps you can take to address this issue. Most of these are simple jobs you can do in an afternoon.

You may find, however, that these solutions are stopgaps and the problem returns sooner or later. In this situation, you may find it wiser to replace your windows.

Modern windows like ours are built to last. They're made of durable materials that won't decay and let in those unwanted draughts.

Still unsure? Here are seven ways to draught-proof your uPVC windows.

1. Silicone sealants

If the problem is caused by small gaps or cracks, you can fill them with silicone sealant. Before you do, make sure you're using a sealant intended to be used with uPVC.

The process is simple. Get your high-quality silicone sealant and apply the gel to the edges of the frames. It will harden and keep out the draught.

2. Weatherstripping

Weatherstripping is a foam strip or rubber seal that's applied to the gaps around doors and windows. It helps keep out air, moisture and draughts by creating a tight seal.

There are several types of weatherstripping on the market. These include tension seals, brush seals, foam strips and sponge tape.

The main drawback of weatherstripping is wear and tear. You should probably replace your weatherstripping once every five years – more often if the window is in constant use. At a certain point, you may decide that a new window is more convenient and potentially more cost-effective.

3. Check your hardware

Window hardware includes locks, handles and hinges. All these can affect the overall performance of a window because they all help seal the frame.

If your uPVC window is causing a draught, check the hardware to ensure it's all functioning properly. If not, you should get new hardware – or a new window.

4. Draught excluders

Draught excluders do what they say on the tin. They're a simple and cost-effective way of filling in the gaps through which air is escaping. 

Before you buy a draught excluder for your uPVC window, you should be aware that a draught excluder alone won't improve your window's energy efficiency. Moreover, a bad installation job can cause problems with moisture and condensation.

Draught excluders are a stopgap in both senses of the word. Yes, they'll help you draught-proof your windows. But they're no substitute for a brand spanking new window made with modern materials.

5. Curtains and blinds

Curtains and blinds can help keep out draughts – at least up to a point. They can be a good, quick fix if you want to reduce the problem without meddling with the window itself.

H3: 6. Window films

Another temporary solution is to apply a window film. This is a transparent film that partially insulates the window.

This is a cost-effective solution, but one that won't make the problem go away forever. Consider it a stepping stone on your way to fully addressing the problem, whether by fixing the frame or replacing your windows.

7. Replace your windows

The methods we've explored here will all help draught-proof your windows. Some are short-term solutions, and some will last for months or even years.

There may come a time, however, when the best thing you can do is replace your windows altogether.

This is because draught-proofing is only necessary with out-of-date products. A good, modern window made from sturdy modern materials won't need draught-proofing. In other words, draught-proofing is a sign that your windows are on their way out.

Yes, new windows can be expensive. But the improvements they'll make to your energy efficiency make them, in our view, a worthwhile investment. And that's before you consider the money you'll eventually have to spend on maintenance and repairs.

Five signs your windows should be replaced

1. They're more than 20 years old. This will mean they're made of old materials that don't offer optimum performance. Your home can do better!
   
   
2. There's noticeable and persistent condensation between the panes. Yes, these problems can be temporarily fixed. But if you want shot of them for good, new windows are your best bet.
   
   
3. The frames are warped or damaged. At a certain point, it becomes more cost-effective to replace than to repair. In the process, you'll get a new window or set of windows with superior energy efficiency, durability and security.
   
   
4. You want to make your home more energy efficient. Modern uPVC windows are a great step towards improving your home's energy efficiency – and not just because they get rid of draughts.
   
   
5. The problem won't go away. You can draught-proof to your heart's content – but if the problem lingers, it's time to replace your window.

Frequently asked questions