decoupling a ceiling
Hi, I am new to this site. I wanted to ask a question about decoupling. I hear people on this site are experts on sound. This is not a music question, but perhaps you can give me some insight. I have sounds from people walking(foot steps) and a bit of talking above me in an upper duplex. I'm obviously on the bottom floor unit. I took off the ceiling the other day and found that there was two ceilings one on top of each other. The top one is on a beam about 4 inches high, which is connected to another floor which sits on a beam 8 inches deep(closest to me). The ceiling is now exposed.
My question to anybody is , can I put something in between the beams(say gyproc, with maybe that green glue, I heard about), in order to muffle the sound. I also plan to add extra beams on the walls to create a ceiling that is not attached to the existing beams. Does this make sense?
Any ideas are greatly appreciated.
Thanks to anyone who answers!!