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Thread: Dishwasher gurgling through sink

  1. #1
    DIY Junior Member lcuga13's Avatar
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    Default Dishwasher gurgling through sink

    I was at my in-laws new lake house and we turned on the dishwasher. I was in another room watching tv and began hearing a loud gurgling noise. I went into the kitchen to discover the noise coming out of the drains in the kitchen sink. I looked underneath to see how the builder hooked up the dishwasher and I see why there is so much noise, as the incoming drain empties into the crossover piece between the sink bowls.

    Is this the proper way to bring the drain line in? The drain line is brought up high in an arc to prevent drain backflow. But, this is awfully noisy especially in this house with a very large kitchen, all granite tops, hardwood floors, and 12 foot ceilings. It simply echoes around the main floor.

    Here is a photo of the way it is hooked up. There is no access underneath the floor to the drain line as the ceiling below is finished drywall.

    Last edited by Terry; 11-14-2013 at 08:05 PM.

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    Geologist sjsmithjr's Avatar
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    I'm no plumber, but neither was the guy that hooked that up. No, that's not right. The dishwasher connection should look this:

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    Last edited by sjsmithjr; 09-07-2008 at 02:29 PM.
    -Sam Smith
    Licensed Professional Geologist - AL, TN, KY

  3. #3
    DIY Junior Member lcuga13's Avatar
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    The difference I see in that photo is that the incoming dishwasher drain hose is brought into the vertical tailpipe off the sink basket. I do not follow how that is going to remove the gurgling noise. Any explanation from anyone?

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    Master Plumber nhmaster's Avatar
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    The gurgling sound is the non code aav. I would rather see the dw tailstock in the vertical position, but I doubt that's causing the noise.

  5. #5

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    I would normally install the DW tee in the vertical, too. But that probably doesn't contribute to the gurgling. I certainly don't like the plastic strainers.

    In the other example of the DW inlet built into the end outlet drain, that's common on trailer houses, but I haven't commonly seen it on homes.
    Steve's Plumbing Service

  6. #6
    DIY Junior Member lcuga13's Avatar
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    Default Asko dishwasher

    These issues really bother. The builder is dragging it's feet to finish the punch list and I keep finding these small problems. This dishwasher is an Asko brand. I was surprised to hear how noisy it is, and now my in-laws are concerned. I told them I would try and figure out what is going on, but I told them I am pretty sure it is an installation mistake causing the noise and not the dishwasher.

    I didn't think about the plastic strainers when I took the picture, but you are right, I would prefer to see brass under there. The sink is also a nice undermount sink, but the strainers up top are a nice dark bronze. I haven't seen a strainer with metal top and plastic bottom before.

    Thanks for any help with this weird noise issue.
    Last edited by lcuga13; 09-07-2008 at 07:06 PM.

  7. #7
    Master Plumber Redwood's Avatar
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    A dishwasher draining being heard at the sink is normal,
    It discharges on the sink side of the trap so it will be heard.
    The dishwaasher drain is usually vertical.

  8. #8
    Plumber krow's Avatar
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    Quote Originally Posted by nhmaster View Post
    The gurgling sound is the non code aav.
    This is your problem. The horizontal hook up does not matter either way. Some diwashers may discharge water quicker than others, and the insufficient air that the avv allows is the culprit.

  9. #9
    Master Plumber nhmaster's Avatar
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    Look closely at the photo. That's on of those black boca vents on there, not an approved studa-vent. They rattle and make a gurgling sound all the time.

  10. #10
    Master Plumber Redwood's Avatar
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    Yes its got the cheapo AAV but a dishwasher tailpiece is mounted on the house side of the trap therefore water falling to the trap will be heard. The level of sound will vary depending on the height of the fall.

    If you don't like to hear it close the sink stoppers and it will go away.

  11. #11
    Moderator & Master Plumber hj's Avatar
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    Default Dw

    The sound of the water is coming out of the second drain. There is nothing "wrong" with your connection, but if it were connecte to the vertical pipe over the trap it would probably mask a lot of the sound coming out of the drain. The AAV should only be functioning when the drainage stops.

  12. #12
    Consultant cwhyu2's Avatar
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    The thig about dishwashers is they have a pump,and will make noise
    no matter what the configuration of your waste piping.

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    DIY Junior Member lcuga13's Avatar
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    Default They don't always have to be noisy

    I understand that with this set-up, there will be noise. It is possible to not have any noise, so the statement that a dishwasher's pump will always cause noise is not true. For example, my dishwasher drain line is run through the floor into it's own trap before it connects to the 3" horizontal drain that is also drains from the sink. With this setup, there is no noise coming through the sink.

    With not being used to hearing any of the water being pumped out, I found this to be extremely loud and annoying. As I mentioned before, it is a large kitchen with lots of granite, hardwood floors, and no fabric to absorb any sound, so it really echoes around and the sound is heard in adjoining rooms.

    Is the only solution for this setup is to remember to plug the strainers when the dishwasher is on in order to not hear the pump noise?

    Thanks

  14. #14
    DIY Senior Member SteveW's Avatar
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    Did you see the comments above about the possibility of the AAV causing some of the noise?

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    Forum Admin, Expert Plumber Terry's Avatar
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    Sometimes the dishwasher has it's own trap coming from the wall.
    There would be a fixture cross in the wall and two outlets.

    A trap for the sink
    And a trap for the dishwasher.

    Perhaps that would be quieter, however you are moving water through, and that does make noise.
    Mine goes through a disposer first, and it gurgles quite a bit as the pump drains it.

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