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Thread: DWV Condensation

  1. #1

    Default DWV Condensation

    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. #2
    Master Plumber Redwood's Avatar
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    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 by Redwood; 10-04-2008 at 03:50 PM.

  3. #3
    Plumber jimbo's Avatar
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    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.

  4. #4

    Default 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.

  5. #5
    Plumber jimbo's Avatar
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    You do have somewhat more extreme climates than we have here in S. Calif. so a little insulation can't hurt!

  6. #6
    Retired Defense Industry Engineer jadnashua's Avatar
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    Insulation might soften the sound of water draining, but other than that, shouldn't be needed.
    Jim DeBruycker
    Important note - I'm not a pro
    Retired Defense Industry Engineer; Schluter 2.5-day Workshop Completed 2013, 2014

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