There are various methods for soundproofing an existing ceiling. The most common way is diagrammed below. This is the most effective system to prevent noise from travelling through your ceiling. Using our Sound Barrier, MLV Tape, Sound Insul, and Sound Clips on top of your existing ceiling will eliminate both airborne and transmission noise from above.
This is the most common procedures for existing ceiling soundproofing, there are other procedures available, call for more details.