Preventing noise between 1st floor unit and 2nd floor unit

[Shawn Mcenteer]

I live in duplex MFR, units are on top of each other. Floors are very old, 3" wide fir installed directly to floor joists. I specializes in wood flooring so installing, sanding etc would be done by myself. I want to sand and refinish existing floor but the concern I have is noise traveling between units. The property will appeal to luxury "A" type family. Currently the main problem will be noise on the first floor coming from the second level. What solutions have members used in the past to lower noise between units? I have high ceilings so installing wood on top of existing floor is possible but expensive considering I can refinish existing floor myself. I live in first floor unit so I can refinish upstairs floors then attack noise issue from my unit via sheetrock layers or sound dampening fixtures that attach to joist (large project and not cheap).

[Jack Edgar jr]

Great question. When renovating our old 1920's 2 flat we wanted to cut the noise down and found several different products to install between floors. What we went with is spray foaming the ceiling joists of the first floor throughout the house then, installed resilient channel in the living room for extra sound absorption. It has worked great and would recommend. Follow all instructions to install channel and drywall properly otherwise all that work is useless. Biggest takeaway-Make sure to use sound barrier caulk between the ceiling and wall, NOT drywall mud so that the sound vibrations do not travel easily to the wall thus transfering the sound and you hearing it there instead. There are many sites on how to properly install online. I hope this helps.