Cast Iron VS PVC for DWV

Discussion in 'Plumbing Forum, Professional & DIY Advice' started by Steven Gaffin, Sep 27, 2012.

  1. Steven Gaffin

    Steven Gaffin New Member

    Sep 27, 2012
    I am starting to dive into a kitchen remodel of my house and need to put in a new drain and vent stack for the kitchen sink. The house is 1920's and the existing waste line is cast iron. I originally thought that I would use a coupling to attach PVC to the existing run. While I was researching I noticed that the cast iron distributors were really pushing the benefits of cast Iron pipe, especially with the new hubless fittings.

    Why is PVC preferred over Cast Iron? is it anything significant?
  2. Tom Sawyer

    Tom Sawyer In the Trades

    Nov 29, 2010
    That's kind of a Cadillac Versus Hyundi question. You will need special tools to work cast iron.
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  4. hj

    hj Moderator & Master Plumber Staff Member

    Aug 31, 2004
    Cave Creek, Arizona
    I guess you did not notice that the plastic PVC and ABS distributors were pushing the "benefits" of their materials also. That has been going on for a century or more.
  5. jadnashua

    jadnashua Retired Defense Industry Engineer xxx

    Sep 2, 2004
    Retired Systems engineer for defense industry.
    New England
    CI costs more, because it is heavier, requires more substantial supports, if leaded, requires a lot more skill and special tools, and because it is slower to install and costs more to buy, ends up costing a bit more to install. PVC and ABS are lighter, cheaper to buy, and quicker to install. CI will end up being MUCH quieter than any plastic install unless extrordinary sound proofing is done. So, since most people opt for cheaper, they use plastic drain lines. Plastic lines also expand and contract much more than CI lines, and if not installed to allow that, will make additional clicking or popping sounds when they rub against a tight hole or other object.
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