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Old 09-03-2019, 01:03 PM   #1
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Replace PVS Stack (noise) with Cast Iron or Spray Foam


Remodeling the kitchen and bathroom and have the chance to do something about the main toilet drain noise. The house is 30 years old and built with PVC stack instead of cast. I have some $$ built into the budget for this and am wondering if I should sprayfoam or replace with cast. Plumber suggested the sprayfoam, sprayfoam guys recommended the cast stack (no i am not kidding). Any thoughts? House has 3 baths (vertical) and a kitchen on the stack wall.

Thanks...
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Old 09-03-2019, 01:11 PM   #2
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Re: Replace PVS Stack (noise) with Cast Iron or Spray Foam


How much room do you have in the wall?
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Old 09-03-2019, 03:15 PM   #3
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Re: Replace PVS Stack (noise) with Cast Iron or Spray Foam


It's difficult to make any changes down the road once you have a cast stack. I'm renovating my house and doing just the opposite, removing a cast stack and replacing with PVC.
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Old 09-03-2019, 04:17 PM   #4
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Re: Replace PVS Stack (noise) with Cast Iron or Spray Foam


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Originally Posted by geenowalker View Post
...and am wondering if I should sprayfoam or replace with cast.
How about Roxul (rockwool batt)?
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Old 09-25-2019, 11:53 AM   #5
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Re: Replace PVS Stack (noise) with Cast Iron or Spray Foam


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Originally Posted by TarheelTerp View Post
How about Roxul (rockwool batt)?
Bats do nothing for sound. Sound is controlled by the material density.
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Old 09-25-2019, 12:18 PM   #6
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Re: Replace PVS Stack (noise) with Cast Iron or Spray Foam


I would try the spray foam. There is no way in ell I would replace working PVC with cast iron. I have broken up, cut up, and cut out enough rusted and clogged CI to know that is not a great option.

Layer the wall with some type of sound board?

or............https://www.soundproofcow.com/produc...proofing-wrap/

Or all three, wrap, spray foam the cavity and use a sound deadening board.
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Last edited by Yodaman; 09-25-2019 at 12:23 PM.
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Old 09-25-2019, 12:59 PM   #7
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Re: Replace PVS Stack (noise) with Cast Iron or Spray Foam


Quote:
Originally Posted by geenowalker View Post
Sound is controlled by the material density.
By this... I'll assume by this that you've never used Roxul.
You should remedy that.
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Old 09-25-2019, 03:08 PM   #8
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Re: Replace PVS Stack (noise) with Cast Iron or Spray Foam


Quote:
Originally Posted by TarheelTerp View Post
By this... I'll assume by this that you've never used Roxul.
You should remedy that.
Agree on Ruxul. Insulated my main stack behind the master bathroom wall and space between the joists below the shower pan on the second floor. It provides significant noise reduction!

Last edited by tdisss; 09-25-2019 at 03:10 PM.
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Old 09-26-2019, 12:05 PM   #9
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Re: Replace PVS Stack (noise) with Cast Iron or Spray Foam


Quote:
Originally Posted by TarheelTerp View Post
By this... I'll assume by this that you've never used Roxul.
You should remedy that.
We tried that first. Rockwool sent me to spray foam in the beginning.
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Old 09-26-2019, 01:07 PM   #10
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Re: Replace PVS Stack (noise) with Cast Iron or Spray Foam


Quote:
Originally Posted by geenowalker View Post
We tried that first. Rockwool sent me to spray foam in the beginning.
However less than perfect Roxul Batts may be...
WHEN (not if) that wall is opened again
you don't want to have to deal with any glued down to everything material.
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Old 09-26-2019, 01:56 PM   #11
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Re: Replace PVS Stack (noise) with Cast Iron or Spray Foam


Quote:
Originally Posted by TarheelTerp View Post
However less than perfect Roxul Batts may be...
WHEN (not if) that wall is opened again
you don't want to have to deal with any glued down to everything material.
Was talking to these guys yesterday. Soundproofingcow.com and their quiet wrap kit.

https://www.soundproofcow.com/produc...proofing-wrap/

Theoritically I could utilize both.
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