Standpipe to Sink Drain

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02-01-23, 04:25 PM

M_D_R12

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Standpipe to Sink Drain

Hi, I am looking to install a standpipe to drain the water from the washer. I took a picture of the current set up and my plan. I was wondering if this was correct or if there is a better way.

Sink->ABS P Trap->Tee (1.5 in x 2 in x 1.5 in) facing up -> elbow -> pipe to stack

2 in standpipe (min 24 inches in length according to washer manual) connected to tee

Another way I thought was sink -> elbow -> Tee (1.5 in x 1.5 in x 2 in) -> ABS p trap -> pipe to stack

Last edited by M_D_R12; 02-01-23 at 04:48 PM.

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02-02-23, 05:24 AM

Pilot Dane

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I don't understand your (1.5 x 2 x 1.5) nomenclature since you don't say what is the 2" portion??? A washing machine needs everything 2" or larger. So, you will need 2" everything all the way back to the stack. You can have 1 1/2" beyond (upstream) for the sink but everything downstream of the washer must be 2" minimum.

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02-02-23, 06:10 AM

XSleeper

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No you cannot do it the way you have it drawn, a washer standpipe requires a trap and cannot be combined with the sink the way you have it drawn.

It would be helpful to see a picture that shows your pipes in entirety, perpendicular to the photos you posted, and more like the photo below.

From what I can find, this might be a good solution.

Whether or not this will work for you depends on your local plumbing codes, but for reference, see P2076.1.2.1 Laundry tray connection to standpipe. (Below)

Where a laundry tray waste line connects into a standpipe for an automatic clothes washer drain, the standpipe shall extend not less than 30 inches (762 mm) above the standpipe trap weir and shall extend above the flood level rim of the laundry tray. The outlet of the laundry tray shall not be greater than 30 inches (762 mm) horizontally from the standpipe trap.

Your standpipe looks too far away but if you can move it to be within 30" that might work. Note also the standpipe must be above the rim of the laundry tray.

And as Pilot Dane mentioned, the pipe from the washer to the stack must be 2" minimum.

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02-02-23, 10:43 AM

M_D_R12

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Additional Photos

Sorry, that's what HD has listed on their site so I assumed it was common knowledge. It appears 1.5 are the outside and 2 in would be the middle. I thought I could connect the 2in standpipe to the middle section but based on what you said I will need to replace the piping right to the stack with 2 inch piping?. I'm in Ontario, Canada

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02-02-23, 11:01 AM

XSleeper

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Don't know what Canadian codes might apply, this is a US site. In the US washers require 2" pipe. And that photo is better but needs to be taken from farther away so we can see where all those pipes go and where your washer is currently. The vertical 1 1/2" pipe coming off the tee looks like a vent to me.

Your 1.5x2x1.5 tee would be reducing 2" to 1 1/2" which is not allowed.

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