Exterior secondary glazing

21 Oct 2008
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United Kingdom

I have done searches on Google and here for exterior secondary glazing and haven't found much at all. I have 2 sash windows that are deliberately sealed shut, one of which also has obscure film. Our other sash windows have all been refitted with double glazing, but I don't want to spend out for new frames and glass when they are not going to be used.

Another option is interior secondary glazing but again, although windows are not going to be opened it seems a shame to lose the access to the interior window sill and spoil the look of it. Instead I would like to put the secondary glazing on the outside. It isn't overseen and wouldn't be obvious from either the outside or inside.

Ideally I would like a large double glazing unit to cover the whole of the outside but I imagine I would need a second frame to hold this. However, perhaps perspex sheet screwed and sealed to the frame front would work.

Is there any practical or legal reason why I can't do this. I think I will have to do something about condensation or ventilation. One of the windows is on the first floor.

Any advice would be great

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