I agree and the sentence I thought I’d written about applying a similar formula to walls somehow slipped off the page.
The rest, including the way the room is furnished, comes under behaviour and that’s not something you can easily legislate.
However, you can provide information that says if the resident has low-rated slab and wall insulation, they may need to moderate their behaviour and, for instance, not hang a flat screen TV with powerful in-built speakers on a wall adjoining two apartments.
It’s not perfect but you have to start somewhere and right now there is absolutely nothing to tell prospective buyers and renters how well insulated (or otherwise) their new home is.