Sash Windows - Noise Insulation

16 Mar 2014
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United Kingdom
I have some wooden sash windows at the front of my property, single pane of glass, no double glazing. You can see an example of one here:

They used to have separate secondary glazing (fitted in the 90s) but it looked awful and made cleaning the windows very difficult. Its a listed building so I dont think uPVC will be an option.

Heat loss isnt really an issue, but noise can be. I'm struggling to find a company that will specialise in this type of work in the South Devon area.

Could anyone make a recommendation of what sort of company may be able to help?
This company seems to offer a good solution but only operate around London:
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Even in Edwardian times secondary glazing, in the form of side hung glazed casements on the inside were commonly used in big cities
Even in Edwardian times secondary glazing, in the form of side hung glazed casements on the inside were commonly used in big cities
Can only agree. With a listed building you always have this difficulty. A good C&J will be able to make appropriate internal casements with opening lights. I've seen such done in recent days with the lights double glazed and hemetic sealing on the frames also so effectively triple glazed and has raised the EPC rating somewhat. They also managed to retain the venician blinds between the external frame and the new internal casements.
Such internal casements will reduce the size of your window cills though.
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a Mate lives in a listed building. Busy road.
he had a company supply and fit a routed rebate to the sashes and frames, adding some kind of seal.
That increased both sound and heat insulation although not massively.
There are ways of fitting "listing approved" (dependant on your officer) double glazed panels for original frames.
Probably massively expensive for any benefit.

For sound insulation I'd ensure that firstly the originals can be sealed (as above) but a big air gap is the key.
A big gap, reasonably thick glass (for safety as well) and close fitting seals.
You would lose the window ledge but you could take advantage by incorporating blinds/screens or using the new ledge for display.
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Thanks for the feedback. I'll try a local C&J as suggested to see what they can come up with.
You don't have much choice with a listed building. Draught seals may help a bit. I would personally discount trying to add double glazing to original sashes - even slimline 4-4-4 is 12mm thick instead of the (probably) 3mm you have, so 1) never really fits the glazing bars and 2) is much heavier requiring new weights etc. I agree secondary casements probably best solution.

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