I am getting ready to close up my new kitchen soffit and I was wondering what would be a good option to try and soundproof the DWV pipes in the soffit.

Should I try to wrap them?

Or should I try to stuff in some Rockwool?

Or should I try to build some kind of box with acoustic foam?

Or do nothing and just accept some of that noise?

  • 1
    Are you keeping someone in your soffit and you don't want them to hear you in the kitchen?
    – DMoore
    Mar 1, 2021 at 16:15

2 Answers 2


I can't imagine there would be a lot of noise coming from them. If you're really concerned about it, stuff some extra insulation up in there and and use 5/8" drywall or double up on the 1/2" drywall. I've done this in the past and had some pretty fussy customers happy.


Are your pipes plastic (ABS/PVC)? Plastic is noisy and can make popping sounds due to thermal expansion. If it's just a straight run of pipe in your soffit that's bothering you, you could cut out a length of plastic pipe and use Fernco couplings (the steel-banded ones) to splice in a section of Cu DWV or CI (depending on size), using straps or hangers for support.

Alternatively, to leave the pipes as-is and just soundproof the drywall, I've had great success with a double layer of drywall with "Green Glue Noiseproofing Compound" between them.

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy

Not the answer you're looking for? Browse other questions tagged or ask your own question.