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Thread: Water Supply Lines for Bathroom

  1. #1
    DIY Junior Member KShirriff's Avatar
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    Default Water Supply Lines for Bathroom

    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?

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    Forum Admin, Expert Plumber Terry's Avatar
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    1/2" for hot and
    3/4" for cold and then branch with 1/2"

  3. #3
    DIY Junior Member KShirriff's Avatar
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    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. #4
    Moderator & Master Plumber hj's Avatar
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    That MIGHT be what I would do with copper, but not with PEX.
    Licensed residential and commercial plumber

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    Retired Defense Industry Engineer jadnashua's Avatar
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    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.
    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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