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Old 01-05-2020, 06:06 PM   #1
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Standpipe Overflowing


We have a 1950s house and most of the folks in our neighborhood have reported issues with old plumbing. Our problem is a constant overflowing of the washing machine standpipe (we have a fairly new washing machine). Water pools underneath the machine and then floods the garage floor. Snaking the line often helps a little, but it always returns and cleaning the line gets old as I have to remove the washing machine to get to the cleanout pipe etc.

I'd rather not replace the piping that runs inside the wall and am thinking that a thicker standpipe, to allow more time for water to drain, would be sufficient. A utility sink would be great, but there is no room at all for this (we have a drier and washer side-by-side).

I've tried a chunky standpipe (pictured below) and it is not quite enough volume to prevent overflow. I was wondering if anyone could suggest some sort of plastic tank/reservoir that would work, sitting between the drain pipe of the washing machine and the P-trap (rectangular in shape)? The current standpipe is not anchored to the wall, but for a tank, I would attach to wall studs for sure. I'm just not sure which type of tank I could use and how to attach an inlet and outlet.

I appreciate any suggestions you could give!

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Old 01-05-2020, 06:27 PM   #2
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Re: Standpipe Overflowing


I solved that problem of inefficient drain pipe size with way too many standard 90 ells in galvanized pipe by placing a restriction in the washer hose end.
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Old 01-05-2020, 09:42 PM   #3
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Re: Standpipe Overflowing


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Originally Posted by SeniorSitizen View Post
I solved that problem of inefficient drain pipe size with way too many standard 90 ells in galvanized pipe by placing a restriction in the washer hose end.
Interesting! What did you use as a restrictor?
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Old 01-05-2020, 09:55 PM   #4
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Re: Standpipe Overflowing


You could go much higher with your expanded pipe. I had one that pumped right to the ceiling for a trap that was about 6 ft high.
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Old 01-05-2020, 10:49 PM   #5
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Re: Standpipe Overflowing


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Originally Posted by Ferrino View Post
Interesting! What did you use as a restrictor?
If I told that You'd think it should be in the joke section so I've pictured what I'd probably use today because I'm not a poor college student raising a family anymore.
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Old 01-06-2020, 08:53 AM   #6
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Re: Standpipe Overflowing


I would install a utility sink there to use as an "expansion tank" for the washer drain.
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Old 01-06-2020, 09:04 AM   #7
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Re: Standpipe Overflowing


When you snake it, how far do you need to go to clear the restriction?
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Old 01-06-2020, 11:40 AM   #8
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Re: Standpipe Overflowing


I'm seeing a2"standpipe connected to a 1 1/2" trap. A utility/laundry sink is the way to go.

This one is less than 24" wide. Looks like it might fit.
https://www.homedepot.ca/product/jag...tee/1001514054
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Old 01-06-2020, 12:25 PM   #9
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Re: Standpipe Overflowing


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Originally Posted by Ferrino View Post
A utility sink would be great, but there is no room at all for this (we have a drier and washer side-by-side).



I don't think a U sink will fit unless it could be suspended from the ceiling.
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Old 01-06-2020, 12:49 PM   #10
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Re: Standpipe Overflowing


The standard pipe size for a washing machine is 2". Your drain is undersized.
A larger drainpipe or a utility sink is your solution.
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Old 01-06-2020, 12:59 PM   #11
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Re: Standpipe Overflowing


Here is a utility sink 18" W
https://www.homedepot.com/p/MUSTEE-U...-12C/202041452
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Old 01-06-2020, 01:10 PM   #12
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Re: Standpipe Overflowing


If you do not go with the sink, I’d remove that 2 inch pipe, and go back to 1-1/2 you are slowing the water down in the 2 inch, then trying to accelerate it thru the reduction into the trap.

Yes, make the stand pipe taller. The higher it is, the less gpm will be pumped by the washer.

Do not cap the stand pipe as shown, just stick the end of the hose into the pipe. That will vent the stand pipe by allowing it to pull air in to the pipe around the hose. I think you are creating a partial vacuum by capping the stand pipe, slowing the water flow into the trap.

Last edited by Oso954; 01-06-2020 at 01:12 PM.
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Old 01-07-2020, 08:42 AM   #13
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Re: Standpipe Overflowing


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Originally Posted by Yodaman View Post
Yeah, assuming the wall plates are standard size, there is likely enough room for an 18"W sink there between the washer and the water heater platform.
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Old 01-07-2020, 08:56 AM   #14
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Re: Standpipe Overflowing


OP QUOTE:
A utility sink would be great, but there is no room at all for this (we have a drier and washer side-by-side).
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Old 01-07-2020, 05:08 PM   #15
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Re: Standpipe Overflowing


You need a utility sink that drain was never sized for a washer.
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