Secondary glazing?

[Weirdfish]

Need to install some secondary glazing in a property that is right beside a busy road.
Anyone with any experience with this, good makes to go for, spec etc etc

[Weirdfish]

Anyone.

[Glamdring]

There have been other threads on this so not sure why a search has come up blank.

[IanBear]

we used city sound - good service and would happily recommend them. they have some special glass, can't remember the name that i'm sure they would recommend.

[UKMike]

Many moons ago we had Everest secondary glazing fitted to an old bay window in a Victorian cottage. It worked well and was the only option at the time which would maintain the appearance of the house. Because you end up with a larger air gap than standard double glazing, the sound reduction can be impressive.

In the next house I fitted Polycell DIY sliding secondary glazing - aluminium frames with brush seals and 4mm glass. Again, good noise reduction and much better thermal insulation than single panes. Some fiddling about with non-square window frames made this job challenging but satisfying. I'd like to think I saved some cash doing this but you have to feel comfortable handling large sheets of raw-edged glass until you get the frames on. Polycell secondary glazing is now sold as Link-Line I think.
Since then I have only encountered "normal" PVCu double glazed windows.

I have no idea how costs compare nowadays.