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Thread: 3/4 inch or 1/2 inch for vertical pipes.

  1. #1

    Default 3/4 inch or 1/2 inch for vertical pipes.

    I am going to run 3/4 copper for my horizontals and was wondering if there is any advantage to doing 3/4 for the verticals? I want a powerful shower and even though the shower vavle openings look kinda small, I thought maybe 3/4 inch would be better than 1/2 inch for the supplies and head?

  2. #2
    Retired Defense Industry Engineer jadnashua's Avatar
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    Default

    The only time you might need 3/4" is if you have more than one shower head outlet. "Standard" new showerheads are flow restricted, and 1/2" is plenty. Having 3/4" is almost a necessity if you have more than one. It also helps to fill the tub faster, if your valve is designed for 3/4" inputs (some are, most aren't). It depends on how many outlets are open at the same time. If you have many on a 1/2" supply, you may not be able to maintain pressure - then 3/4" (or even larger!) may be necessary.

    Not a pro...
    Jim DeBruycker
    Important note - I'm not a pro
    Retired Defense Industry Engineer; Schluter 2.5-day Workshop Completed 2013, 2014

  3. #3
    DIY Senior Member e-plumber's Avatar
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    Lightbulb Pipe Sizes

    If you're referring to the water supply piping in the bathroom wall and you're installing a regular shower valve with one 2.5 gallon per minute head, 1/2" feed lines for the faucet are adequate, especially if the inlets to the valve are 1/2".
    Now if you are talking about horizontal lines in the basement and asking which size piping to bring up (vertically) to the bathroom, it would be 3/4". I always pipe 3/4" copper feed lines to the second to last fixture.
    e-plumber

  4. #4
    Plumber, Contractor, Attorney LonnythePlumber's Avatar
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    Default Showerheads

    Much of what is considered power from a shower comes from the quality of the shower head. It's design to incorporate air into the water gives the feeling of force or power. An $80.00 shower head is worth as much as the valve.

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