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PVC pipe sound dampening

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  • PVC pipe sound dampening

    Anybody know of another way to dampen the sound from a pvc pipe in a wall and floor (bathroom waste pipe) other than wrapping it with insulation. Other materials? Thanks.

  • #2
    Re: PVC pipe sound dampening

    Use a sheet of quiet rock over the bay with the pipe in it.

    http://www.quietsolution.com/

    Around here this runs about 80/ sheet. make sure to use the appropriate caulk at the edges of the joist bay.

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    • #3
      Re: PVC pipe sound dampening

      I've heard of ice&water shield or quietblanket (sound deadening material used in cars) being used. It works well, but I have no idea about the long-term issues.

      We spec PVC vents and fittings with no-hub to cast iron branches and stacks. Its quiet and about 1/2 $ of a complete cast job.

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      • #4
        Re: PVC pipe sound dampening

        Well, replacing it with cast iron is the easiest way, if you can get to it without too much trouble....
        HERS Rater • BPI Building Analyst • BPI Envelope Professional
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        • #5
          Re: PVC pipe sound dampening

          We had a contractor that had us sheet both sides of the stud cavities with valley tin and fill the cavity with sand. I'm not saying that's what you should do, but it worked very well.
          Mark


          If I had a dollar for every time I heard someone say, "If I had a dollar for every time....", I'd be a rich man.

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          • #6
            Re: PVC pipe sound dampening

            Mark,
            And each time someone slammed the door in that partition, a little more sand leaked out of the stud bay ....

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            • #7
              Re: PVC pipe sound dampening

              Maybe try 2" thick rockwool batts adjacent to the pipe and a layer of 1" shaftwall drywall next to that followed by the finish layer of drywall. Wherever the pipe penetrates a joist, isolate it with foam pipe wrap. Thick and dense materials will go the furthest in killing off this sound.

              Otherwise you could use a high density fiberglass and a mass loaded vinyl mat but the material is significantly more expensive than the drywall and rockwool approach.
              "ALS IK KAN" - Stickley

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              • #8
                Re: PVC pipe sound dampening

                You can buy some spray foam in a box. Spray a couple of inches around the pipe of in the cavity.

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                • #9
                  Re: PVC pipe sound dampening

                  Studio:

                  In my house I used sheet lead in a 2' roll supplied by my plumber. It has worked great. I would think that the 1" "core board" as we call it around here would work well if you have the room to inset it.

                  Core board is also referred to as shaft wall, a 1" gypsum product sold commercially in 2' x 8' lengths.

                  Good luck,

                  RJC
                  Every job is a self-portrait of the person who did it. Autograph your work with quality.

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                  • #10
                    Re: PVC pipe sound dampening

                    RJ:

                    I've got to agree with you, when ABS became legal here for DWV I used it in a two story home, after it was complete the customers invited the wife and me over to dinner, ostensibly to show their appreciation for the house. In the middle of dinner one of the twin children excused himself, got up from the dining room dinner table, went upstairs and flused a toilet, it sounded like Niagra falls in the formal dining room. I got the message and sent some men back, tore out one side of the 5/8" sheetrock and had the plumber put cast iron between the floors. Shortly after I was building a hospital and when installing the lead-lined sheetrock in the radiation suite I noticed the tremendous sound deadening effect, I always wondered if I had just put another layer of lead-lined sheetrock on that wall if it wouldn't have saved me a lot of time and money; however, I've read the specifications on the lead lined sheetrock and USG says nothing about sound attenuation, I've called them and they just say they've never tested it for sound deadening. That was the one and only time I've ever used plastic pipe (except for perimeter drains around the foundation on the outside of the house).
                    You will ask what goal the U.S. is pursuing? .... their external debt is huge, and ruining other countries is their customary method. Even ownership of the global 'printing press' is no longer helping. Nor is full control over NATO, None of that if enough for the 21st century colonizers. They don't just need to preserve the dollar as the only global currency but also to get their hands on the economic wealth of other large powers and regions. - Sergei Naryshkin

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                    • #11
                      Re: PVC pipe sound dampening

                      Lead does work well, again because of the density, but the last few sheets I bought about 5 months ago were in the $ 12.00/sf range. The shaft wall is much cheaper and is readily available at any decent drywall supply yard. As RJ described and as I inferred in my earlier posting, the shaft-wall would be inset between the joists or studs on wood furring or perhaps 25 ga. utility angle screwed to the side of the framing.

                      As commodity prices have come down recently, we may see the lead price decrease in coming months as old inventory gets sold off.
                      "ALS IK KAN" - Stickley

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                      • #12
                        Re: PVC pipe sound dampening

                        I think I read a few months ago that there is a brand of PVC DWV pipe that is designed for sound control. I wish I could remember the name of it.

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                        • #13
                          Re: PVC pipe sound dampening

                          Originally posted by Martin Holladay View Post
                          Mark,
                          And each time someone slammed the door in that partition, a little more sand leaked out of the stud bay ....
                          We told the GC we thought that would happen, but he insisted. The reason pvc and abs make so much noise is that the pipe resonates like a guitar string as the water runs down the inside of the pipe. The water spirals down the pipe and causes it to vibrate. What you hear is an amplified sound. Shorter pipe higher pitch, longer pipe lower pitch. Smaller diameter, higher pitch, larger diameter, lower pitch. I would think low expanding foam shot into the stud cavity would dampen the vibrations enough to virtually cut out the sound.
                          Mark


                          If I had a dollar for every time I heard someone say, "If I had a dollar for every time....", I'd be a rich man.

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                          • #14
                            Re: PVC pipe sound dampening

                            Originally posted by calvert View Post
                            The shaft wall is much cheaper and is readily available at any decent drywall supply yard. As RJ described and as I inferred in my earlier posting, the shaft-wall would be inset between the joists or studs on wood furring or perhaps 25 ga. utility angle screwed to the side of the framing.
                            Wouldn't a couple of layers of standard 5/8" drywall work just as well or better than core board?? Sure, core board is not hard to get, but how is it going to be better? Seems like two separate layers would give better sound-dampening anyway.
                            "If you only have a hammer, all problems look like nails"

                            Vintage wood window repair and restoration in Chicago
                            Wood storm windows in Chicago
                            Weatherizing vintage buildings in Chicago

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                            • #15
                              Re: PVC pipe sound dampening

                              Way up top, Total Home posted a link to Quiet Rock. This one might also work.

                              http://www.quietsolution.com/html/quietrock.html

                              This stuff is engineered for exactly this purpose, and it weighs no more than regular 'rock. Skip the multiple layers of 1" rock, sand, lead, etc.
                              All complex problems have a simple solution. That solution is invariably wrong.

                              Peter Engle, PE
                              Almost Home, Inc.
                              www.almosthome.com

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