After putting up with alloy framed almost double glazed patio doors since 1970's I bit the bullet this year against raised heating costs to replace them with upvc. They were the biggest size they could go with standard thickness glass at around 2.6m x 2.4m high.
Fitting was a disaster with the wrong spec frame fitted, 1 double glazed unit shattered, a fitter who couldnt get the locking to work smoothly so drilled out oversize the lock and the handle plastics making the lock and sliding door unacceptable. I had them resupply everything except 1 unit of glass and get a different fitter. All went fairly well 2nd time around. They have been in around 2 months now & with the weather here in Kent getting colder at night I notice condensation on the outer glass first thing in the morning, but none on the inside which is how it should be. But what I do have is condensation on the sealing area where the inner slider and outer fixed vertical upvc parts meet.
![sweating strip.png sweating strip.png](https://cdn.imagearchive.com/ukworkshop/data/attachments/129/129333-66b3ea756af29fdefa5b66ac55fd238a.jpg)
As far as I can see, this arrowed part is going to be a cold spot as the only thing sealing it from the outside world is 2 plastic brush strips maybe 5mm wide mounted on a strip of plastic 1 attached to each side of the inner sliding vertical.
Here is what the brush/felt strips look like.
Is this I wonder the same with all modern upvc sliders?
Fitting was a disaster with the wrong spec frame fitted, 1 double glazed unit shattered, a fitter who couldnt get the locking to work smoothly so drilled out oversize the lock and the handle plastics making the lock and sliding door unacceptable. I had them resupply everything except 1 unit of glass and get a different fitter. All went fairly well 2nd time around. They have been in around 2 months now & with the weather here in Kent getting colder at night I notice condensation on the outer glass first thing in the morning, but none on the inside which is how it should be. But what I do have is condensation on the sealing area where the inner slider and outer fixed vertical upvc parts meet.
![sweating strip.png sweating strip.png](https://cdn.imagearchive.com/ukworkshop/data/attach/129/129333-sweating-strip.png)
![sweating strip.png sweating strip.png](https://cdn.imagearchive.com/ukworkshop/data/attachments/129/129333-66b3ea756af29fdefa5b66ac55fd238a.jpg)
As far as I can see, this arrowed part is going to be a cold spot as the only thing sealing it from the outside world is 2 plastic brush strips maybe 5mm wide mounted on a strip of plastic 1 attached to each side of the inner sliding vertical.
Here is what the brush/felt strips look like.
![sweating seal strips.jpg sweating seal strips.jpg](https://cdn.imagearchive.com/ukworkshop/data/attach/129/129345-sweating-seal-strips.jpg)
![sweating seal strips.jpg sweating seal strips.jpg](https://cdn.imagearchive.com/ukworkshop/data/attachments/129/129345-c10c539b4e0188ad1ed1cedc3d780687.jpg)
Is this I wonder the same with all modern upvc sliders?
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