31 Oct 2011
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United Kingdom

We ordered new double glazed sash windows.
The manufacturer and installer delivered windows but the frame is about 1 CM wider than the original period (1907) single glazed windows.

The manufacturer claims that it is a must due to the glass being thicker etc etc.

Our neighbors have also replaced their windows with double glazing but they width of the pane is the same as the original window.

Can anyone please advise if I am right or the manufacturer is right??

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1cm thats nothing, did you get your windows from the same place as your neighbour if not then thats why they are different not all windows are exactly the same
I presume when you say 1 CM (10mm) wider; you refer to reducing the glass sight line at each side by 10mm? This is not a great difference but could visually be a little noticeable.
Worse would be manufacturing any horizontal or vertical glazing bar 10mm wider, as originally they are usually only 20 - 22mm wide anyway and a 32mm wide glazing bar looks horrid.

We manufacture and install replacement windows for period properties and our frame section is identical in width to any traditional sash, so looks no different from inside or outside, but we have to increase the front to back wood thickness to provide a rebate to accept a sealed unit that complies with building regs. So your manufacturer may be correct in his statement that “it is a must due to the glass being thicker”. However it would have been nice if they had either showed you a sample of the frame section at time of giving you the quote, or said that the window section will not match the original.
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