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Thread: Pipe Size for new Bathroom

  1. #1
    DIY Senior Member nelsonba's Avatar
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    Default Pipe Size for new Bathroom

    I am adding a 2nd bathroom on the top floor of my house and I'm wondering what size PEX to run for the supply lines. I will be tapping into 3/4" galvanized Pipe right after the water heater. The total pipe length will end up being 30-50'. I'll be installing a toilet, sink, and shower.

  2. #2
    Forum Admin, Expert Plumber Terry's Avatar
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    http://www.terrylove.com/watersize.htm

    You could run 1/2" for hot side, lav and shower
    I would run 3/4" for the cold side, toilet, lav and shower. Each fixture would get a 1/2" branch.

  3. #3
    DIY Senior Member nelsonba's Avatar
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    How far from the fixtures should the branches start?

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    Forum Admin, Expert Plumber Terry's Avatar
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    You can manifold them, or branch out in the wall.

  5. #5
    Tradesman Plumber Kristi's Avatar
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    you would run the main 1/2" hot and 3/4" cold all the way to the bathroom, and branch off for the first fixture, then the next, then the next

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