Water line size advice on new basement bath?

Discussion in 'Plumbing Forum, Professional & DIY Advice' started by Vinniejt76, Aug 27, 2008.

  1. Vinniejt76

    Vinniejt76 New Member

    Joined:
    Aug 27, 2008
    I'm installing a half bath in my basement and I need advice on tapping into the existing lines. I have a 3/4 in main line leaving the water heater, then it branches out to fixtures on the first floor to 1/2 in lines, and the 3/4 inch continues upstairs to feed those fixtures. Is it okay if I tap into one of the half inch lines feeding the first floor for my basement half bath?
    Also I was going to use shark bite T's for tapping in, has anyone used thses before?
     
  2. jadnashua

    jadnashua Retired Defense Industry Engineer xxx

    Joined:
    Sep 2, 2004
    Occupation:
    Retired Systems engineer for defense industry.
    Location:
    New England
    General rule of thumb, two fixtures on a 1/2" line. Lots of houses have more and work okay; just depends on what flows are required. A half-bath won't be using much. Better if you can probably tap into the 3/4" line and then run 1/2". See what the pros have to say...
     
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  4. cwhyu2

    cwhyu2 Consultant

    Joined:
    Aug 11, 2007
    Occupation:
    Consultant
    Location:
    Cincinnati OH
    I would come off the 3/4 lines to feed your new bath, that way you will
    not be losing the volume to your other fixtures.
     
  5. edhoman

    edhoman New Member

    Joined:
    Aug 7, 2009
    What is the penalty of having 3/4" water line fed by a 1/2"?

    Thanks
     
  6. FloridaOrange

    FloridaOrange Plumbing Designer

    Joined:
    Dec 2, 2005
    Occupation:
    Plumbing Designer
    Location:
    SW Florida
    Lower pressure and volume.
    I would tap off of the 3/4" with 1/2" hot and cold.
     
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