Why Is My uPVC Window Not Closing Properly?
How to Check for Problems in Your uPVC Windows
The most common problem with PVC windows is that the sash won't close properly against the seal, which means you will lose money when the heat escapes outside. The problem is caused either with the lock, the hinges, or a dropped sash.
Close your sash and check the hinge side. If there is a gap between the sash and the frame on the hinge side, then it is your hinges. All that is wrong is that your hinges are after wearing down and not pulling the sash in tight against the frame anymore. A new pair of hinges is needed. It only takes a few minutes and is not a big job, most people would be able to do this job themselves, and most window companies will do it for you.
Close your sash, and on the inside, slide a credit card between the sash and the frame. The card should fit tight and shouldn't be easy to move around. If not, then you more than likely are getting a draft. All that is needed here is a small adjustment to your lock and it will tighten up the seal. Almost anyone would be able to do this job; all that is needed is a set of Allen keys.
Check If Sash Has Dropped
This problem affects windows that have a side-swing opening, the type that opens like a door. Close your sash and look at the top corner above the handle. Move slightly; if you can see daylight, that means the sash has dropped. Also, check that the sash is fitting equally with the frame. If it has shifted down at the handle side, then your sash may be dropping. Most sashes will drop a bit without affecting the overall performance of the window, but if it keeps dropping, that is when the problems start.
How to Fix a uPVC Window That's Not Closing Properly
If you want to have a go at fixing any of these problems yourself, below is a guide to help you get it sorted.
How to Fix uPVC Window Hinges:
- Unscrew the hinges from the frame and lift the sash out.
- Have a look at the sash and the way the old hinges are fixed to it.
- Unscrew the old hinges and put the new ones on it the same place.
- Place the sash back into the frame and screw the hinges back onto the frame.
- Check that it is opening and closing.
How to Fix uPVC Window Locks:
To adjust the lock will only take a minute, and all that is needed is an Allen key.
- Open the window and look at the cams—these are the parts that move up and down when you move the handle.
- These can be turned with an Allen key. Turn them one way and it tightens the sash against the seal. Turn them the other way and it loosens them.
How to Fix a Dropped Sash in a uPVC Window:
- Take out the glass, then close your sash and make sure your sash is lined up.
- Now put your glass back in and pack it right around with plastic packers so that there is no movement between the glass and the sash. If you don't have plastic packers, you can get them at any company that makes windows. They are very cheap to buy. The chances are there is not enough of them in your sash from day one and that is why your sash dropped.
- To help prolong the life of your Espag locks and hinges—especially if you are living near the sea—rub grease onto them. This will keep the air from harming them, stop corrosion, and slow down wear and tear. As for the dropped sash, there is nothing you can do about this until it happens, as this happens due to the glass being fitted badly.
Feel free to ask any questions by posting them in the comment box below.
More Help With uPVC Windows
- How to Tell a Good uPVC Window from a Bad One
If you are thinking of getting new windows, make sure you read this guide first. It could save you a lot of grief down the road.
- My uPVC Window Won't Open
Is your uPVC window jammed or stuck closed? Then keep reading to learn how to solve the problem and fix your window without spending a lot of money.
- uPVC Door Is Catching on Frame When I Open and Close It
How to adjust your PVC door hinges. This is not a hard job to do and can be carried out by almost anyone. All that is needed is a set of hex keys.
Did you find this info helpful?
This article is accurate and true to the best of the author’s knowledge. Content is for informational or entertainment purposes only and does not substitute for personal counsel or professional advice in business, financial, legal, or technical matters.
Questions & Answers
One of my top hung windows is not sealing properly against the frame and letting in some draft. If I pull the window hard towards myself when shutting the window, it closes a bit better but not completely. What could this be?
You might just need a new pair of hinges.Helpful 7
My windows seem to be draughty and I suspect the interlocks are to blame. Looking at them I don’t understand how they can lock and seem to be a mix of types. One is is metal style and the other plastic and they seem to push against each other but push apart rather thank lock together. Have they been fitted the wrong way around?
Interlocks come in all shapes plus you have different types for different styles of hinges. But they all do the same job and when the window sash is closed. They should work like two wedges one on the sash and one on the frame, and when closed they keep the center part of the sash tight against the frame. BUT as windows get older hinges will start to wear down and your window sash can than run in a different line. So this can also affect the way your interlockers meet.
Here's how to tell.
If your windows were fine all along, then started letting drafts in. More than likely it's your hinges.
But if your windows have been giving trouble from day one. Then it is more than likely the interlocks. They might be fitted wrong, or they could have the wrong style to match your hinges.
Note: The egress fire hinge for side hung window sashes are different from a top hung window sash as the hinges run in different lines and close differently.
So if someone mix these up when making the windows, they would not allow the window sash to close properly
I've replaced hinges on side hung upvc window. Now when I close the window I've got a big gap between sash and window frame on the bottom corner of the handle side. All other sides are ok. Do you have any suggestions? How to fix this problem.?
It sounds like the sash is hanging off the square and it is now hitting the run-up wedge on the bottom.
Check the bottom of the window frame and remove the block. If this works you will then need to re-adjust your sash and then replace the block
If this doesn't work check that both hinges are the same top and bottom. They might look the same, but they can run differentHelpful 1
My window doesn't close properly at the top. I've tried fitting new hinges but it's just the same there's a draft blowing through all the time. Is my window just cheap uPVC windows?
If this is a side hung sash and if the draft is coming in on the hinge side at top.
It sounds like the hinges are fitted wrong or they are the wrong size.
If the draft is coming in at the top on the lock side.
Check the locking cam is at most six inches away from top.
If it is more than six inches away than you will need to fit a longer lock.
If the lock is the correct size than check if the sash is after dropping down.
If this is the case you will need to take the glass out and redo the toe and heeling to get the window sash back in place.
If you have a top opening sash and the draft is coming in at the top in the center.
Than it sounds like the inter locker is missing.
A inter locker is just a set of two wedges that keeps the sash closed tight when it is closed.Helpful 7
I recently moved into a new building, and my bedroom window does not seal properly at the top right corner. I’ve tried adjusting the cams, but that doesn’t seem to work. Do you have any suggestions?
Your window needs new hinges.
The interlocking part on the hinge is worn down and not closing the window against the seal.
Be sure to change both hinges and not just the faulty one because if you don't, your sash will not run smoothly and will only cause your hinges to fail again.Helpful 6
© 2012 Martin