Water Supply Lines for Bathroom

Discussion in 'Plumbing Forum, Professional & DIY Advice, Tips & ' started by KShirriff, Dec 1, 2012.

  1. KShirriff

    KShirriff New Member

    Messages:
    14
    Location:
    Tuscaloosa, Al.
    I need to run water to the 2nd floor bathroom. Should I run 3/4" up from the basement and reduce down to 1/2" for my connections or just branch off of the 3/4" in the basement and run 1/2" up to the bathroom?
  2. Terry

    Terry Administrator Staff Member

    Messages:
    14,943
    Location:
    Bothell, Washington
    1/2" for hot and
    3/4" for cold and then branch with 1/2"
  3. KShirriff

    KShirriff New Member

    Messages:
    14
    Location:
    Tuscaloosa, Al.
    so 1/2" for hot all the way up to the 2nd floor and 3/4" for cold up to the second then branch with 1/2"
  4. hj

    hj Moderator & Master Plumber Staff Member

    Messages:
    26,537
    Location:
    Cave Creek, Arizona
    That MIGHT be what I would do with copper, but not with PEX.
  5. jadnashua

    jadnashua Retired Defense Industry Engineer xxx

    Messages:
    21,949
    Location:
    New England
    There's good and bad for going with smaller hot lines - unless you're running a recirc system, the smaller line means less waste while waiting for hot. But, 1/2" pex is closer to 3/8" copper in its ability to transport water. This may be okay for a single showerhead, toilet, or sink, but not for two at a time, or for filling a tub.

    If you go with a manifold system in the bathroom, get one with at least one extra port and use it to run a return line should you want to add a recirculation system.
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