Would old supply line cause low pressure?

Discussion in 'Plumbing Forum, Professional & DIY Advice' started by DavidTu, Jul 2, 2014.

  1. DavidTu

    DavidTu Member

    Joined:
    Dec 3, 2009
    Location:
    Seattle, WA
    if a house is fed by 3/4 galv pipe that is quite old, probably corroded inside how would that affect the pressure at the entry? We are seeing relatively low pressure now wondering if we replaced the supply to the house from the street with new 1" Pex would we see an improvement in pressure?
     
    Last edited: Jul 2, 2014
  2. Terry

    Terry Administrator Staff Member

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    Aug 17, 2004
    Occupation:
    Plumber
    Location:
    Bothell, Washington
    1" Poly would be even better, though 1" PEX would be an improvement too.
    Galvanized piping gets very rough and closes down in size. Replacing the pipe from the meter is always noticable in a big way.
    Friction loss is most of the problem, and decreased pipe sizing.
     
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  4. DavidTu

    DavidTu Member

    Joined:
    Dec 3, 2009
    Location:
    Seattle, WA
    Thanks Terry. I am leaning toward 1" PEX just because it's easier to deal with. The Poly needs a Ford Fitting when it gets inside to transition to PEX, which is a bit of a hassle. With PEX you can just come right in without transitioning and I do like the PEX connections at the meter better because no straps to rust out.

    Once inside, for a 3-3/4 bath home do you tend to run 1" or 1.25" for main trunk? PEX or copper?
     
  5. Terry

    Terry Administrator Staff Member

    Joined:
    Aug 17, 2004
    Occupation:
    Plumber
    Location:
    Bothell, Washington
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