I'm no expert, but I have a little experience with sound mitigation. IME, the effort needed to reduce unwanted noise depends a lot on the frequency range. Ver

I'm no expert, but I have a little experience with sound mitigation. IME, the effort needed to reduce unwanted noise depends a lot on the frequency range. Very roughly speaking, dampening high-frequency sounds can be done with relatively thin and light sound-absorbing materials. Lower-frequency noise, including vibrations that shake the building's superstructure, require more extensive modifications. It would be awesome if an actual acoustic engineer or architect could weigh in on this.