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Not sure we'd be wise to go with tons of sand but I'll file that in the back of my mind!
Our block is from the 1930s and purpose built. Overall, sound insulation is good. Definitely far better than modern purpose built or conversion flats I have lived in.
It might be that there is no such thing as non-carpet flooring that is silent for blocks of flats. In that case, I guess we'll just have to look at carpets that can deal with the occasional pile of dog puke.
Stonehedge
Aroogah
withered_preacher
Times have moved on since I last did an acoustic underlay to building regs standards but it involved expensive 10mm thick mats with rubber on one side and chopped reconstituted foam on the other, it all needed sealing to the edges of the room with acoustic sealant then had a laminate floor fitted over the top. Ceiling below was double plasterboard. It worked but there was still a lot of noise transmitted through the staircase!
At the time I was researching it we also looked at some kind of spun concrete between joists and incredibly sand, lots of it between joists. The idea of close to a ton of sand resting on the ceiling wasn't very reassuring though.