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Old 01-08-2016, 12:35 PM   #1
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Converting Dishwasher Standpipe


The people who owned my home before decided to install a standpipe under the kitchen sink and simply drop the dishwasher's drain hose into it.

The standpipe has a trap and connects to the vertical soil pipe in the wall, which I assume to be the drain / venting since there is a bathroom directly above. The standpipe solution was working fine but I was never happy with it because I prefer a closed system in the cabinet.

Yesterday I decided to install a waste tee/wye into the standpipe. I capped off the top of the waste tee/wye, and ran the dishwasher hose to the tee.

I like that the system is now closed but two questions are concerning me.
1. The kitchen sink trap gurgles very loudly now! Does that mean I have a venting issue?

2. Since the waste tee is now closed on top (typically it would be opened to a sink or something), and the water flows in there -- does there need to be a one-way valve on the top instead of a cap?

Any help or insight would be appreciated. Thank you !
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Old 01-08-2016, 01:03 PM   #2
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Post a picture of this ---odd set up.
Why didn't you just add a tail piece with a dishwasher drain to the existing sink and cap the old stand pipe?
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Old 01-08-2016, 04:01 PM   #3
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Post a picture. It sounds like maybe they had the standpipe acting as a vent. You might need to install an AAV on top of the standpipe and use a dishwasher tail piece.
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Old 01-09-2016, 11:51 AM   #4
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Thanks so much. I took a few pics but it is really dark in there and they did not come out well. In the meantime, I did what I should have done to begin with as you suggested -- capped off the standpipe and tied the washer in directly to the kitchen drain via waste tee. I think you may be right about the standpipe doubling as a vent and I might need an AAV in there but I was hoping to avoid it since both traps tie into the vertical pipe that runs up the wall to the other bathrooms.... Running some tests now but the new washer cycle is 3.5 hrs! I will try to get some light in there and take some pics in a minute..

Thanks!
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Old 01-09-2016, 12:21 PM   #5
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Here are some pics -- you can see how i ghetto-capped off the standpipe that I initially converted into a waste tee.
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Converting Dishwasher Standpipe-img_0107.jpg   Converting Dishwasher Standpipe-img_0109.jpg  
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Old 01-09-2016, 02:09 PM   #6
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You have a higher and lower pipe coming out of the wall is that correct?

If it is cut in a tee and install the aav verticle right before the wall on the KS drain.
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Old 01-10-2016, 08:19 AM   #7
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You are correct ghostie, both pipes come out of the wall next to each other.

... next stop, studor vent. Wish I didn't need one but I'm not about to replumb the vent lines

Now I just have to figure out how to tee in the AAV -- one side is ABS and the other is PVC.

Do you know if we can mix and match ABS and PVC if we are using threaded fittings or am I going to Fernco it?

Thanks,
Chris
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Old 01-10-2016, 08:46 AM   #8
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Replace the plug on that stand pipe with the AAV--extending the pipe up as high as you can would be wise--
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Old 01-10-2016, 10:23 AM   #9
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Mike It will do no good on the lower pipe it has a trap. Your going to have to cut the pipe on the upper pipe by the wall and install a sanitary tee on its back with the AAV 4 inches or better above the trap. Then re-pipe your trap in using a female trap adapter. Use all ABS with ABS glue you can not mix the plastics until after the trap adapter.
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Old 01-10-2016, 01:50 PM   #10
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Thanks,
i hadn't noticed the trap.
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Old 01-11-2016, 09:12 AM   #11
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Thanks guys. I installed the AAV in the horizontal line as close to the wall as possible but was surprised to find a good quarter inch of sludge in the ABS when I cut it! I cleaned it out as far as I could reach with my fingers and installed the AAV.

Thanks for your help!

Now guess what happened next? The freakin' sink wouldn't drain at all! Probably because of all that damned sludge!

So late last night I snaked out the sludge from the basement cleanouts as best I could. What a nasty, messy job. I was covered in the stuff. There is still a lot of sludge in there but the sink drains like a charm now.

So now I am wondering if I ever needed the AAV in the first place! Oh well, at least it works and isn't hurting anything.

In the meantime I'm wondering if I should try to clean out the sludge -- any thoughts on the DIY hydrojet like the ClogHog or maybe I should hire someone or simply leave it as is until the next backup?

Thanks again, you all have been very helpful!

Chris
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Old 01-11-2016, 09:17 AM   #12
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I agree. Best to snake it to be sure its cleared. Then start using bioclean. That stuff eats that sludge right up.
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Old 01-11-2016, 12:06 PM   #13
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Never hear of bioclean - it sounds promising. thanks for the tip
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