Reducing Up Down Duplex Sound between floors

[Eric Gutierrez]

We have an up down early 1900s duplex that we are remodeling the lower unit (all new wiring. new kitchen, new bathroom etc.) We are looking into how to reduce the sound transmission between floors. The ceiling had been furred down with 1x3s had a 12x12 ceiling tile installed over it. We tore down the ceiling tile already and are trying to decide the best path going forward. What we are considering is having cellulose blown into the ceiling by drilling holes into the current lath and plaster ceiling and then possibly using resilient channel and attaching perpandicular to the furring strips. Anyone have any experience with this type of work? Anything you have tried that worked or didn't work well?