Water Flow At Both Faucet & Shower Head

Discussion in 'Plumbing Forum, Professional & DIY Advice' started by jerryb437, Mar 6, 2011.

  1. jerryb437

    jerryb437 New Member

    Messages:
    4
    Location:
    Louisiana
    Looking for a simple fix that may not exist, but here it goes anyway. Got a typical shower & faucet setup. Pull knob on the faucet. I hear people talk about having water flow at the faucet when in shower mode, but I'm having the reverse problem. When in faucet mode, I have water flow coming through the shower head. Thus, a wet head when tring to run water in the tub. I've installed a simple in-line cuttoff at the shower stem to choke off some of the water flow to no avail. Changing shower heads hasn't worked. Is there something else I can try, maybe a pressure valve at the stem instead of a cuttoff??
  2. LLigetfa

    LLigetfa DIYer, not in the trades

    Messages:
    4,185
    Location:
    NW Ontario, Canada
    Odd that the in-line shut-off didn't work. Must be faulty. They are designed to be able to turn the shower on and off without messing with the temperature adjustment.

    Generally how a diverter works is the piping to the shower is always open and simply choking off the tub spout creates enough pressure for the water to overcome gravity and take the alternate route. There could be some constriction in the tub spout or the diverter is not full open. I would start by removing the tub spout and see how well it flows out the stub pipe.

    I wonder if someone didn't install the rough-in valve body upside down. Often, the shower outlet will have a smaller port than the tub spout outlet.
    Last edited: Mar 7, 2011
  3. jimbo

    jimbo Plumber

    Messages:
    8,997
    Location:
    San Diego
    The take off to the tub may be improper. If pex or cpvc was used, you will have that problem. Also, if the house pressure is in excess of 80, it can also cause your symptoms.
  4. hj

    hj Moderator & Master Plumber Staff Member

    Messages:
    27,237
    Location:
    Cave Creek, Arizona
    The shower arm valves are usually designed so they do NOT turn off completely. That is so you cannot use it to turn the water on and off creating a hot/cold crossover in the faucet which would still be turned on. A plastic line to the spout, excessive copper tubing and fittings between the valve and the spout, or an inverted valve are the most likely causes. I have NEVER seen it happen because of excessive pressure, although I suppose it could under EXTREME high pressure.
    Last edited: Mar 7, 2011
  5. jerryb437

    jerryb437 New Member

    Messages:
    4
    Location:
    Louisiana
    I'll be tearing the wall out today so I'll let know. Could very well be a bad install on the rough-in.
    Thanks Everbody
  6. jerryb437

    jerryb437 New Member

    Messages:
    4
    Location:
    Louisiana
    I'll be checking the pressure too. Hope to have a better handle on the problem today.
  7. Terry

    Terry Administrator Staff Member

    Messages:
    15,412
    Location:
    Bothell, Washington
    It could also be an upside down valve. Make sure if it's marked for Shower, that it's pointed the right way.

    The size of pipe to the tub spout needs to be full size, no PEX there.
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