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 Post subject: Bowed UPvc window
PostPosted: Fri Sep 15, 2017 3:08 pm 
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Hi, I have a top hung upvc window downstairs that is over 15years old that has a draught at the centre between sash and frame. The sash is tight to seals on the top and handle. There is a bow in the centre maybe 2-3mm (looks ok on the frame side). There is a lintel over the top of the window. My thoughts were that new hinges would not fix this as there is a bow ? Is there much I can do other than checking if maybe the centre frame was forced in removing sealant?


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 Post subject: Re: Bowed UPvc window
PostPosted: Fri Sep 15, 2017 4:16 pm 
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Hi

Just so we're all using the same terms, it sounds like a casement window if it's hung, not a sash.

That said, how wide is the casement? Is the bowing in the casement itself? Is the bowing between the hinges at the top?

If the casement is bent it sounds like something could be forcing it out of shape, it's unusual for one to bow I would say, unless perhaps it has done so under it's own weight, I have seen ones that were just made too big to support themselves.

Does the casement open and close properly and easily? Does it stay bowed when it is opened?

Got a photo?

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 Post subject: Re: Bowed UPvc window
PostPosted: Fri Sep 15, 2017 7:12 pm 
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Ive always understood that a sash is the opening part of a window -the term applies to casement and vertical sliders.

Im not sure if I understand the problem, the explanations a bit confusing :-)

It sounds like you are saying the top rail of the top hung sash is bowed, but the head of the frame is straight?

If its the sash, maybe it needs deglazing and the top rail straightening by using glazing packers. I might be wrong though, best to see if windowman on here adds a comment -hes a bit of a guru on these matters.



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 Post subject: Re: Bowed UPvc window
PostPosted: Fri Sep 15, 2017 9:31 pm 
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Apologies I may have confused matters in my use of terms. Attached are some photos (they are a little grainy). The window is 220cm wide, 130cm high. The opener is 90cm wide by the full 130cm high so rather large. It seals tight in the top, and bottom corners but not in the middle on one hinge side. Using the straight edge on the vertical upvc bit suggested a bowing.


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 Post subject: Re: Bowed UPvc window
PostPosted: Fri Sep 15, 2017 10:33 pm 
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You could try a sash compressor

http://www.coastal-group.com/Timber-Cas ... d-Keep-Set

I couldnt guarantee it will fit your upvc profile.

The problem is that the friction stays at the top create seal compression, as does the lock at the bottom, however theres nothing to compress the seal midway and the force of tbe weatherseal is bowing the sash.


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 Post subject: Re: Bowed UPvc window
PostPosted: Sun Sep 17, 2017 10:53 am 
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Thanks. I also came across some products called sash jammers. Does anyone have any experience of them? I think they are designed to stop undesirables entering. Fitting them would look a bit of a bodge but I could combine with the other product to force everything together!


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