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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
andos
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.