Sound proofing floor


I am at the point that I don't need to modify or purchase anything else. But I am considering sound proofing the floor for the sake of my neighbors which know that I will lower the volume when they ask. I am considering raising the floor and making that raised floor decoupled from the room and insulated.
Any ideas?
pedrillo
Thank you Psacanli, you know you make a good point the vinyl should do a good job of slowing down the outgassing! I was also concerned about the vinyl itself, I remember in my research of outgassing that foam was one of the greater culprits and that plastics too, the softer the plastic the greater the outgassing. I don't expect the plywood to slow gassing too much but if vinyl proves to be not so harmful then I will go with your suggestion! Thanks!
Pedrillo,
I am in the middle of a sound proofing project and have found the Green Glue web site to be an excellent practical and no nonsense source of information and test results. I would encourage you to read everything on this site before going too far. They discuss a variety of common approaches and solutions and counter some things that seem intuitively correct. Whether you choose to use their products or not, it is very helpful.
Green glue appears to be the most commonly used adhesive in soundproofing projects. A friend has a Rives-designed dedicated room which used a lot of that stuff.
As someone has already intimated.....is consult with an Acoustic Engineer (not some builder who has done acoustic work).
Acoustics is a science (unless we try to design a Concert Hall where it becomes more of an art), and what may seem logical to the uninformed can often be disastrous.
Putting in another floor is a pricey exercise and you want to do it ONCE and CORRECTLY.