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Jameo-
I guess that's the as mentioned by @jackbepablo does it go over the whole window? I don't think that would work as I've got old timber frames that are not flat or straight.
I was aware of that but figured something external and thicker would do a better job, maybe not.
skinny
Has anyone fitted plastic to their single glazed windows either internally or externally to create a void?
I'm thinking about screwing plastic into the outside of the windows to help. I'm sure it won't be as good as double glazing but wonder how much it would help.