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Thread: supply line sizing

  1. #1
    DIY Junior Member apparentgenius's Avatar
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    May 2008
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    Oregon
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    Default supply line sizing

    Hi,

    I am in the process of plumbing a new house with PEX. I have a 1" main coming into the house.

    Is there a limit of how many 1/2" fixture supply lines that I can take off of a a 3/4" branch off of the main? My total fixture units on the second floor is 23 made up of 4 sinks,2 toilets, 1 tub, 2 shower heads 1 washer, 1 dishwasher.
    The distance from the 1" supply line to the furthest fixture is about 30'

    Any help is appreciated.

    glen

    http://www.terrylove.com/watersize.htm
    Last edited by Terry; 06-15-2008 at 11:52 AM.

  2. #2

    Default

    That depends on how your local code reads it. here in Denver you can size it as you would copper. They don't like to see that 3/8 stuff. What is you psi ?

  3. #3
    DIY Junior Member apparentgenius's Avatar
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    May 2008
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    Oregon
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    Default

    Hi Plumber Jim,

    The water company says that my pressure is 65 psi at the meter. If that's the case, can I feed all of that with a 3/4" line? I'm planning on using the 1" copper ported manifolds, 3/4" inlets, 1/2" outlets.

    Thanks,

    glen

  4. #4
    Plumber patrick88's Avatar
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    Sep 2007
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    Default

    You should not have any problems with your pressure.
    I'm just starting to work with an old friend of mine to bring solar electric and hot water systems, wind turbines, Flex Fuel Boilers, batteries, hydroponic gardening, books, pellet grills and more. Also the parts for DIY installation.

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