Hello,

I am looking to soundproof a shared 8x8 wall in a condo. It is standard drywall with no insulation between. Neighbors' voices and TV come through - I think they should be allowed to talk and watch TV, but I don't need to hear it! I've done a bit of research and am down to two options - just looking for any advice.

1) rip down the wall, add Roxul Safe and Sound and then finish with QuietRock instead of regular drywall.

or

2) keep wall as it is, cover with Green Glue and add a layer of QuietRock.

There's pros and cons to each - just curious to hear any thoughts.

Thank you!

 

If you want to analyze it by the numbers you have to find some reference material for STC ( sound transmission class) ratings. They will give you various constructs and how they rate from a sound transmission perspective.

In general the first means of defense for airborne sounds is to seal any possible gap in the construction with an elastomeric sealant or other suitable products( depending on hole size), then provide a means of absorbing sounds with various fibrous insulations and differing thicknesses of wallboard/plaster.

Tearing down the existing finish would give you the opportunity to examine the wall and seal air gaps originating from your neighbor's apt. such as at receptacles. You would also be able to seal the plate to the subfloor with a sealant. Pay close attention to the construction for all the various leakage paths. You can also do the roxul, add a layer of fiberglass duct board to the entire wall and then apply drywall in various thicknesses with green glue between.

Other option include mass loaded vinyl or rubber roofing applied over the framing prior to drywall.