DWV size in new bath

Discussion in 'Remodel Forum & Blog' started by Dr.C, Jan 17, 2006.

  1. Dr.C

    Dr.C New Member

    Jan 17, 2006
    Hey, great forum!

    I am adding a new 2nd floor master bath (shower, vanaties, toilet). It's a 1930's Cape Cod style with a 16" long 2x4 vertical chaseway running from the 2nd floor to the basement. Can I use this space to run all plumbing + DWV through that - i.e., Is 3" sched 30 PVC ok to use as DWV pipe? Or do I need to enlarge that bay to accomodate sched 40. And if I enlarge it, should I just go with 4" pipe?

    Pittsburgh PA
  2. jadnashua

    jadnashua Retired Defense Industry Engineer xxx

    Sep 2, 2004
    Retired Systems engineer for defense industry.
    New England
    3" would be a tight fit if you can do your joints outside of the chase. That would be sufficient. But, if there are any nails, etc sticking in that area and you have to expand it, still 3" would be oaky, but you could go up to 4". My unprofessional opinion.
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