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New plumbing and venting for washing machine.

Asked Feb 16, 2009, 08:21 PM — 9 Answers
Please take a look at this design and let me know what you think. Please note that the vent and drain stack are on a perpendicular wall.

How long can the pipe with the red question mark on it be? To do this I'd need it to be about 6' including the elbow. I'm guessing I'd have to angle it down.

Thanks in advance for your replies!

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Milo Dolezal's Avatar
Milo Dolezal Posts: 5,914, Reputation: 1933
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#2

Feb 16, 2009, 09:53 PM


Drain should be 2". Use long sweep 90 , or two 45s, to clear the corner. Vent should be 1 1/2". Slope should be 1/4" per foot. Vent should be no more than 48" away from the trap. See if you can run new vent up and connect above on 2nd floor or in the attic. See enclosed drawing....
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massplumber2008's Avatar
massplumber2008 Posts: 10,643, Reputation: 5107
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#3

Feb 17, 2009, 04:21 AM


Luqui80...

Codes differ from state to state...In Milo's area it is apparently 4 feet max. From trap to vent.

In my area it is 6 feet max. From trap to vent. Depending on where you live, I'm sure you'll be fine at 6 feet max. From vent to trap.

Only change we are suggesting is that you take the vent off and run it either up as Milo suggested or parallel to the waste stack as I have drawn below and connect the vent upstairs at about 48" off the finish floor.

If you don't connect the vent as we suggest there is a good chance that the ptrap to the washer will bubble/gurgle and could get siphoned dry when a toilet or tub from upstairs drains past the washing machine fittings...this will allow sewer gas into the home...a major no-no in plumbing...

I also noted some of the things Milo did, like the long sweep elbow, but I have also added a cleanout (dandy cleanout) at base of washing machine pipe and another cleanout at the ptrap to the washing machine (another code requirement). The standpipe should also be between 24" to 30" out of the ptrap.

Let us know what you think here...

MARK
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luqui80's Avatar
luqui80 Posts: 52, Reputation: 1
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#4

Feb 17, 2009, 12:02 PM
Hmm, I really don't want to have to run a new vent all the way to the attic so I looked around the basement and found what I think is the vent for the washer that we have now in the basement. I just can't be sure though. It is 1.5" so I would think its is a vent. Can you tell from this picture?

If it is, would this mean that I can attach a 1.5" wye to the vent and 2" on both of the other openings and use that as my drain for the washer? I've included a picture of that too.
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Milo Dolezal's Avatar
Milo Dolezal Posts: 5,914, Reputation: 1933
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#5

Feb 17, 2009, 12:47 PM


Yes, it is vent. You are lucky for all your rough-in is exposed.

I am not sure if I understand your second question correctly. Can you restate the question ?
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luqui80's Avatar
luqui80 Posts: 52, Reputation: 1
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#6

Feb 17, 2009, 01:23 PM
Oh good! I thought it would be.

So my idea is to cut the vent pipe in the wall and put in a wye that connect to the ptrap. Then the washer will drain directly down into where the vent is now, but of course I would change the entire pipe after the wye to 2" not 1.5" (that's the black line). I think this is how my kitchen sink is.
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Milo Dolezal's Avatar
Milo Dolezal Posts: 5,914, Reputation: 1933
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#7

Feb 17, 2009, 02:06 PM
Re: Post #6: Right down on money !

Additionally: Install the why - or preferably Sanitary T - as low as possible so you can put in your stand pipe that is about 36" tall. Use large sweep 90 under the concrete where pipe turns from vertical to horizontal.
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luqui80's Avatar
luqui80 Posts: 52, Reputation: 1
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#8

Feb 17, 2009, 06:35 PM
Will do, thanks for all your help!
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hvac1000's Avatar
hvac1000 Posts: 14,546, Reputation: 2381
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#9

Feb 18, 2009, 04:33 AM
Try one of these

STUDOR | IPS Corporation
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massplumber2008's Avatar
massplumber2008 Posts: 10,643, Reputation: 5107
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#10

Feb 18, 2009, 11:19 AM
Hi all:

The studor vent hvac1000 is recommending may or may not be allowed in your area...would need to ask a plumbing inspector in your area.

However, since you have the 1.5" vent pipe so close I say you connect into that vent pipe....no mechanical parts to fail down the road!

Have good day...

MARK
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