sound-deadening qualities of insulation

Discussion in 'Plumbing Forum, Professional & DIY Advice' started by Blumengarten, Apr 15, 2009.

  1. Blumengarten

    Blumengarten New Member

    Messages:
    56
    Location:
    Pennsylvania
    Hi Folks,

    I had to have the cast-iron drain lines in my bathroom replaced, and the plumber used the black plastic pipes. It's much noisier than the cast-iron! I'm going to replace the drywall, will putting regular fiberglass insulation help to deaden the sound?

    Thanks,
    Joy
  2. Redwood

    Redwood Master Plumber

    Messages:
    7,450
    Location:
    Connecticut
    Yes it will. There is also board that can go under the drywall that has sound reducing qualities...
  3. Blumengarten

    Blumengarten New Member

    Messages:
    56
    Location:
    Pennsylvania
    Do you know what that board is called?
  4. gss01

    gss01 New Member

    Messages:
    20
    h o m o s o t e
  5. chris8796

    chris8796 New Member

    Messages:
    100
    Location:
    Illinois
    Mass is the key to deadening sound, that is why cast iron is effective. You can buy high denisty membranes to wrap pipes or you can get sheets for behind drywall. Both are somewhat expensive. Fiberglass insulation has limited ability, but better than nothing.
  6. Blumengarten

    Blumengarten New Member

    Messages:
    56
    Location:
    Pennsylvania
    Thanks, Chris and GSS! I will ask at the hardware store and see what's least expensive. I only have about 12 feet that need to be covered, but it will be worth the expense, especially since the drywall is down already, might as well do it right while I have the chance!

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