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I would trust the BBA qualification data for each material over any sales person (if that data is available)
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Yes, I’ve installed 4 secondary glazing units myself from Clearview. All glass acoustic with vertical slide so you can open/clean etc. primarily done as we live on a road and couldn’t get triple glazed in the new sash and case units.
The quality is really good, the process was easy even though measuring was a worry as these are in bays but you can do pretty much anything.
The difference is incredible, can’t hear cars, heat loss is reduced and with blinds up you don’t even notice them.
Edit, no idea about U value, I just wanted something with high acoustic reducing properties so opted for specific acoustic 6 and 8mm glass
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we are having some installed tomorrow. Granada units installed by SE Glazing, they were the slimmest we could find and are not having the wooden subframes, powder coated RAL anthracite (matching our Crittall windows)and with Pilkington Low-E glass. 5 windows, one of which is 5 pane horizontal slider 4.9m wide another a corner lift out with opening sash, rest are 3 pane sliding horizontals to match existing mullions. think it was £7k all in.
you have to get googling for the glass spec as there are many options in coatings/stadep sound laminated and widths etc.
The factory in Sheffield were very helpful and sent me some extrusions of the frame so we could work out where to install them and allowing the centre tilt windows to fully rotate without hitting the frames.
I guess i’ll update tomorrow...
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@tyeness
Does anyone have any experience with secondary glazing?
We're gonna get some this Autumn but I'm finding it difficult to work out which is the best option between glass and plastic.
Can't seem to find an impartial source for which has the lower u value. Glass sellers say glass does, and vice versa with plastic sellers.