Washing Machine Vent Question

[Drake Despond]

Hey Guys,

So I just moved into a newer house and I want to add a washing machine in the basement. There is already a laundry sink down there...which has a p trap and is vented (1.5") and seen in the pic. I have attached a picture of the sink and vent set up and just want to find out the proper (code) way of running the washing machine drain/standpipe. Like how the vent for this washing machine should be tied into (height wise). Any bit of help would be appreciated. The house is only 2 years and I want to try and keep things that I do to the house up to code.

Thanks,

 

[Reach4]

https://www.opia.info/index.php/code-tech-database/17-fixtures/79-13-25-standpipe-to-laundry-tub

Venting would not appear be the problem, but it looks like a standpipe should drain into 2 inch pipe. With 1.5 inch drain pipe, to meet code, you would want to have the washing machine drain into the laundry sink.

 

[Sponsor]

 

[Drake Despond]

https://www.opia.info/index.php/code-tech-database/17-fixtures/79-13-25-standpipe-to-laundry-tub

Venting would not appear be the problem, but it looks like a standpipe should drain into 2 inch pipe. With 1.5 inch drain pipe, to meet code, you would want to have the washing machine drain into the laundry sink.

Ya I thought it would have been 2" as well...seeing the house is only 2 years old. Has the code changed since then?
So you're saying dont worry about plumbing it "properly" and just let the drain hose go into the laundry sink instead of tieing into the 1.5" drain/vent?

 

[Drake Despond]

Or I could do a 2" standpipe drain and tie into the 1.5" drain/vent. Not sure how legal that is though?

 

[Reach4]

Ya I thought it would have been 2" as well...seeing the house is only 2 years old. Has the code changed since then?
So you're saying dont worry about plumbing it "properly" and just let the drain hose go into the laundry sink instead of tieing into the 1.5" drain/vent?

Letting the hose go into the laundry tub is quite proper. As I understand it, no air gap needed, since the washing machines somehow serve that function. I am not sure of that aspect. Other views welcome.

Some washing machine hoses have a hook-type output, but somehow make sure your hose output does not fall out onto the floor.

I put a mesh lint catcher over the output of mine, on its way to the sink. That filtering is not done with a standpipe, but laundry tubs can catch lint in their drain grids sometimes.

 

[Drake Despond]

Letting the hose go into the laundry tub is quite proper. As I understand it, no air gap needed, since the washing machines somehow serve that function. I am not sure of that aspect. Other views welcome.


Some washing machine hoses have a hook-type output, but somehow make sure your hose output does not fall out onto the floor.

I put a mesh lint catcher over the output of mine, on its way to the sink. That filtering is not done with a standpipe, but laundry tubs can catch lint in their drain grids sometimes.

Thanks for the reply. I will go with the discharge hose into the laundry sink and see how that works for the time being.
Thanks again!

 

[Jeff H Young]

Thanks for the reply. I will go with the discharge hose into the laundry sink and see how that works for the time being.
Thanks again!

Likely the only easy way to be legal a separate standpipe requiring 2 inch and may require upsizing even to 3 inch after joining with sink as many of the locations in the USA require. As far as I know going to laundry sink is always legal