2FL toilet connected to a 3" PVC that runs down a "wet wall" between the liv rm and master bath on the 1FL. No issues whatsoever with operation or leaks, but whenever you flush the 2FL toilet the water dropping down the 3" PVC is so loud you expect to see if coming out of the ceiling. Do they make any kind of sound insulation for PVC drains?

The best fix is to replace the PVC with cast iron.

If you don't want to expend resources to that extent ... I have noticed since we insulated a wall that has a toilet stack in it, it is quieter. Not quiet, but quieter.

The area around the 3" PVC pipe is filled with dense-packed cellulose, and the cellulosed area is now sealed off from a plumbing access panel by expanding foam. So there's less space for the sound to echo through, I suppose.

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Links to the State of Wisconsin Plumbing Code:
[docs.legis.wisconsin.gov]
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I am not a plumber.
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Just wrap the pipe with fiberglass insulation batts.

Quiet Pipe? Shell Pipe?



Edited 1 times.

I don't remember the name, but I just found a product than encapsulates the pvc

cost was around $3 a foot and is quieter than cast iron

do a internet search

Ok thanks. I figured insulation would work but was wondering if there some secret sauce that plumbers use....

I have a secret sauce for the barbeque but not for plumbing issues.