PEX expansion loops & droops vs need to drain the line?

Discussion in 'Plumbing Forum, Professional & DIY Advice, Tips & ' started by AcidWater, Nov 15, 2008.

  1. AcidWater

    AcidWater New Member

    Messages:
    123
    Location:
    .
    The fact that you need to leave expansion space with PEX seems to mean that sloping it for drainage would be a problem.

    Does anyone have a method? Do you just install a lot of drain valves throughout the run?

    I also wonder about well water sediment accumulating in the low spots over the years.
  2. hj

    hj Moderator & Master Plumber Staff Member

    Messages:
    26,680
    Location:
    Cave Creek, Arizona
    Pex

    Run it straight and let the expansion take place at the turns/corners.
  3. AcidWater

    AcidWater New Member

    Messages:
    123
    Location:
    .
    What about the stretches between Tees ?
  4. Redwood

    Redwood Master Plumber

    Messages:
    7,450
    Location:
    Connecticut
    How long of a run are you talking about?
  5. AcidWater

    AcidWater New Member

    Messages:
    123
    Location:
    .
    All the tees are at the tail of the main run, and go out between the joists. So no more than about few feet between each tee, for the most part.

    main run from water tank
    |
    ----------->> tee to clothes washer
    |
    |
    ----------->> tee to bathtubs (two risers so one tee in this line)
    |
    ----------->> tee to toilets (two risers so one tee in this line)
    |
    ----------->> tee to lav
    |
    ----------->> tee to other lav
    |
    to outdoor hose bib, which drains the line

    And I just realized that I can't drain the hot because it doesn't go to a hose bib... maybe I should install a connection to the end of the cold line with a 3 way valve.
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