caster iron pipes to quiet rushing water sound

ontariomomApril 23, 2012

Hi all,

I read somewhere that using cast iron pipes can be beneficial to down play the water fall sound that occurs everytime someone flushes. We wondered about a pipe that will go through a wall in our dining room, and whether we should get the plumber to put a cast iron pipe there for sound control. The plumber was not too keen on doing it, and he said the cast iron will rust eventually. Do you think we can get the same effect by just using spray insulation foam, or should we go for the cast iron pipes in this one spot? BTW, it is in an outside wall of a 2 X 6 wall.


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"the cast iron will rust eventually."

Not in your lifetime.

It is more labor, and harder labor, to install.

    Bookmark   April 23, 2012 at 3:55PM
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Thanks brickeyee for your comments. The plumber did say he would charge $300 extra for cast iron, and I don't think he wanted the extra hassle as our job is already quite big. Do you find cast iron makes a big difference in sound insulation? Can the same effect be had with spray insulation, or is our best option that cast iron pipe. The location of the pipe fall is not well placed given it travels through dining room wall.


    Bookmark   April 23, 2012 at 4:09PM
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"Do you find cast iron makes a big difference in sound insulation?"

I have installed cast iron lines in a number of higher end homes to reduce drain noise.

Folks with multi-million dollar homes do not want to hear the upstairs toilet flush in the living room.

It works far better than any sound insulation since you are adding the one thing that stops sound cold, mass.

    Bookmark   April 23, 2012 at 4:42PM
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Thank you very much Brickeyee for your expertise. I will contact the plumber and hopeful he will agree to put in the cast iron. We will also have a drain lin in the wall in between the kitchen and hallway. I think this location will not both me as much as the one going through the dining room as we use the dining room every day.


    Bookmark   April 23, 2012 at 8:21PM
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We have an older (1928) house where cast iron was standard during construction. The previous renovation had a plastic stack running next to the kitchen, and any time the toilet flushed upstairs you could hear the water rushing down. In renovating the kitchen and bathroom, we insisted on cast iron above grade level (it was less important in the basement) to eliminate any noise. Would never do it any other way.

    Bookmark   April 23, 2012 at 9:36PM
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Thanks geller for your helpful input. I think we are going to try for the cast iron pipes as well.


    Bookmark   April 25, 2012 at 6:00PM
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The older cast iron is quieter, but even new cast iron is still much better than plastic for noise control.

The mass of the pipe itself limits how much noise can be transferred from the water.

    Bookmark   April 26, 2012 at 11:09AM
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