sound proofing
I've finally remembered what it's called - Butyl membrane! Apparently it's good for deadening sound and it's the stuff they use to line ponds with so not hard to find, maybe stick it behind the plasterboard if you're re-doing the wall. It was recommended to us by a builder but we didn't bother in the end so I can't vouch for it personally. Might be worth a google though. M.
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