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?

[Ravi P.]

@Eric Gutierrez I insulated my walls and ceilings in my home with Roxul safe and sound. it was a 1920's bungalow. Roxul can be found at HD or Lowe's. it is fire proof and helps with noise transfer. I also installed Roxul in a first floor condo flip I just finished. I did not add the resilient channels. Originally the ceiling was just 5/8 drywall but with the Roxul and 5/8 the ceiling was not sound proof, but did make a difference. The manufacturer's website site shows different methods that can be used and also has STC rating for the different methods. you can add resilient channel and also double up on the insulation I'd you have the space or double the drywall sheets. good luck