When soundproofing a floor for noise, it is important to establish what is trying to be achieved. There are various solutions for airborne and impact noise problems to suit the different floor finishes in homes or flats such as carpet, laminate, vinyl etc.
Typical issues are:
Squeaking floorboards
Footfall noise (thumping when somebody walks above)
TV noise
Talking or music
Caption: Example of the worst kind of problem with floor noise