DWV Condensation

Discussion in 'Plumbing Forum, Professional & DIY Advice' started by Tinmaniii, Oct 3, 2008.

  1. Tinmaniii

    Tinmaniii New Member

    Joined:
    Oct 3, 2008
    Hi all,
    I have an older house I just bought.
    All plumbing is copper including DWV.
    I have one stack in particular ( DWV ) which is 2" copper.
    It goes from first floor,through second floor (picks up another waste line) and throught the attic to vent out the roof.
    It of course runs through a chase, but in some areas it is open to a confined space (underneath the stairs from 1st to 2nd floor).
    My question is:
    should it be insulated to avoid condensation.
    My initial suspicion would be a "no" to the question unless it was under a constant drainage situation, which would change copper temprature significantly if draining for extended periods of time. It is not, it serves only 2 sinks and a shower.
    Am I right? or should I insulate it?

    Thanks to all who answer.
    cheers,
    Tin
     
  2. Redwood

    Redwood Master Plumber

    Joined:
    Dec 15, 2007
    Occupation:
    Service Plumber
    Location:
    Connecticut
    No you should not need to insulate it. The only time it could concievably have a condensation issue is if there was a constant flow of cold water going down it and this would most likely be cured by replacing a leaking toilet flapper. Of course, a toilet would not be on a 2" line...
     
    Last edited: Oct 4, 2008
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  4. jimbo

    jimbo Plumber

    Joined:
    Aug 31, 2004
    Location:
    San Diego
    The water from the sinks and shower is warmish. Even the first flush from a toilet is water which has aclimated to more or less room temp in the tank. SO, I would not expect condensation to be a problem.
     
  5. Tinmaniii

    Tinmaniii New Member

    Joined:
    Oct 3, 2008
    Thanks for the replies.

    So, 2 responses, both in agreement, good.
    I probably wouldn't have thought twice about it except, when I demo'd the walls to re-do the bathroom, I found the 2" copper line covered with a fibrous burlap like covering approx 1/4" to 3/8" thick (disintegrating). It's an old house early 1950's in B.C. Canada.
    Maybe I'll wrap it anyway.

    thanks for responding.
     
  6. jimbo

    jimbo Plumber

    Joined:
    Aug 31, 2004
    Location:
    San Diego
    You do have somewhat more extreme climates than we have here in S. Calif. so a little insulation can't hurt!
     
  7. jadnashua

    jadnashua Retired Defense Industry Engineer xxx

    Joined:
    Sep 2, 2004
    Occupation:
    Retired Systems engineer for defense industry.
    Location:
    New England
    Insulation might soften the sound of water draining, but other than that, shouldn't be needed.
     
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