What's the best way to soundproof your floors? Pouring a concrete topping slab on a second floor creates the ultimate floor soundproofing.Concrete deadens the noise and decreases noise pollution significantly. You should note this isn't standard concrete.You can see, or rather hear, there was a 10 to 15 decibel drop from before the concrete slab was poured on the second floor.Adding a concrete slab on the second floor isn't cheap, but it is the most effective option for soundproofing between floors. Also, you have to make sure to plan for the installation; it will add time on to your build. Nevertheless, it's an awesome option for anyone who is looking to build a very soundproof home. Watch the full video to see how it's installed and to learn more.