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Old 16th April 2018
Gear Guru

A framed wall needs steel framing to get its support and so is screwed at least somewhere to the outside structure.
Not at all. The bigger the gap between the stand alone inner leaf and the outer the better. The floor and ceiling plates of the studding should be isolated also, neoprene strips, glue. Rod's book is the Bible here.

Not too ambitious with isolation because it is quiet enough down there so am just looking for a decent improvement to what I have now.
Isolation is the big brother, you will need to specify. Doesn't have to be in dBs or STC. But we do need to know can you hear footfall above when you are in the studio. That might be enough to stamp NG on the whole project. Isolation is seriously hard to do.

Is the basement at ground level or below? You might get really lucky thermally.