PVC DWV pipe sound insulation

[strutaeng]

Hi, I'm working on an addition project and have an upstairs restroom. Below is a bedroom. I was considering installing cast iron DWV, but everything was done is easy-to-work with PVC Schedule 40...Forgot about how noisy PVC drain pipes are until now, LOL.

Found Buna-N pipe insulation for larger pipe at McMaster-Carr. https://www.mcmaster.com/pipe-insulation

Anybody insulate drain pipes to mitigate sound?

I have 5/8" drywall throughout, so that will help somewhat. Floor is also getting insulated with R-19 fiberglass for comfort. Maybe get a bag of Roxul for floor bays with the drain pipes?

 

[thooks]

Yes, insulating PVC Drain pipes is common practice to abate the sound.

I'd start with a small area and see how well the certain product works.

 

[rlitman]

I would suggest wrapping with MLV, rather than foam for sound insulation.

 

[Dumber than lumber]

So you cut the MLV in long strips and do a spiral wrap?

 

[Todd.Brock]

My buddy built a new house. We insulated every interior wall with rock wall sound control and wrapped all the pvc pipes with MLV - Mass Loaded Vinyl. Can’t hear water moving through pipes , so I assume it did the job.


He bought a 50 ft roll. We 8 ft long cut strips to what ever width for the diameter pipe, and zip stripped it all on there.

Sent from my iPhone using Tapatalk

 

[kbs2244]

In Lake Forest, IL. I think that when they finialy allowed PVC they required lead tape along any straight over 12 inches.
The tape was apx 1/4 thick x 1 inch wide.
Self stick
We got it at the local plumbing supply house.

The idea was it stopped the vibrations.

 

[flat350]

They make a fiberglass pipe insulation in 36" lengths with plastic fittings for tee's,90's and 45's that are filled with loose insulation,it's what is usually used on commercial jobs.

https://www.buyinsulationproductstore.com/Fiberglass-Pipe-Insulation-SSL-ASJ/

 

[Bruce 993 SEA]

I had the exact situation so I went searching on the interwebs...

Found a forum for home theater systems that had a thread about a bath above the area where the guy was building the home theater. He wrapped the ABS/PVC (PVC being quieter than ABS) with carpet padding.

So I dd that and wrapped them twice and sealed it all up with duct tape. Then the entire ceiling was packed with the rock wool sound insulation. You cannot hear the toilets flush now. Before, you could hear the cat walk across the hardwood floors above.

Cast iron is the best and if it were a new build, a cast iron stack would be great.

The MLV is prolly better that the carpet pad but I had just pulled the carpet out of that room.

Let us know how it goes...!

 

[Norcal]

I had the exact situation so I went searching on the interwebs...

Found a forum for home theater systems that had a thread about a bath above the area where the guy was building the home theater. He wrapped the ABS/PVC (PVC being quieter than ABS) with carpet padding.

So I dd that and wrapped them twice and sealed it all up with duct tape. Then the entire ceiling was packed with the rock wool sound insulation. You cannot hear the toilets flush now. Before, you could hear the cat walk across the hardwood floors above.

Cast iron is the best and if it were a new build, a cast iron stack would be great.

The MLV is prolly better that the carpet pad but I had just pulled the carpet out of that room.

Let us know how it goes...!

If someone is concerned about noise from upstairs DWV piping, cast iron is the best way any other way is a band aid.

 

[NUTTSGT]

If I had an issue and used what I have at hand, it would be some Reflectix bubble wrap. I've wrapped a bunch of my older duct work in the basement with it and while working down there, it seems quieter.


A couple of wraps with that and fiberglass batts in the wall cavity.