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Thread: Pipe diameter

  1. #1

    Default Pipe diameter

    Hi. I am replacing my galvanized water lines with cooper in a two story house with a basement. I have the main coming in at 3/4 and will run the supplies at 1". My question is for the first floor supply lines should I knock them down to 3/4 then branch to 1/2" or should I branch of the 1" with 1/2" to the fixtures? The runs are about 10-15 feet from the main supply. I have about 35 psi. Thanks

  2. #2
    Forum Admin, Expert Plumber Terry's Avatar
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    Aug 2004
    Bothell, Washington
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    Using the page above,
    Check out chart 6-4 for how much each fixture uses,

    Then using chart 6-5, the low pressure portion, you can add up how many units you will be using and determine pipe sizing for all of your branches and main water line.


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