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Old 10-16-2008, 04:16 PM   #1
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washing machine drain


I am hooking up a washing machine and have a few questions, wondering if anyone (especially plumbers) out there would give me some advice.

The problem is the drain is only 1" pipe. It runs down the wall and has a trap on it and then it goes into about a 2" cast iron drain (it's an old house). Can I get by with the drain being this small? They were apparently using it that way before I bought the place. I'd really rather not have to spend a day crawling under the house if I don't have to, but if that's what it takes then I guess I will. Thanks,


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Old 10-16-2008, 10:15 PM   #2
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Code would probably not allow it but it might work fine. The hose from the machine to the drain I'll bet is 1"

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Old 10-17-2008, 09:18 AM   #3
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I cannot imagine a 1" pipe being able to handle the discharge from an automatic washer. Code used to be 1-1/2" but is now changing to 2" since the newer machines have more powerful pumps. If you try it, make sure you are standing right there when it hits the spin cycle so you can shut it off.
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Old 10-17-2008, 11:07 AM   #4
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I cannot imagine a 1" pipe being able to handle the discharge from an automatic washer. Code used to be 1-1/2" but is now changing to 2" since the newer machines have more powerful pumps.
I was gonna say something to that effect. It worked for the previous owners, but if your washer ejects water at a higher rate, you could end up with a small flood on your hands.

You could try it out, but keep your hand on the plug in case things get out of control. (<-- Note that's not the best advice, b/c you may still get some water all over the place before you pull the plug).

I'd upgrade to 2" if I were in your shoes..
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Old 10-17-2008, 01:01 PM   #5
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this is what the previous owner had to say:

" just ran the hose from the washer, straight to the drain in the wall
and secured it with a hose clamp. It drained fine, but sometimes the
suction (kind of like a siphon) would continue to suck the water out of
the washer as it filled, and you would have to pinch the hose manually
during the rinse cycle. This was a sporadic problem"


Not sure what would cause this. Anybody?
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Old 10-17-2008, 01:27 PM   #6
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and secured it with a hose clamp
Pretty sure that's what caused it.. and it's against code AFAIK. There should be an air gap around the washing machine hose where it enters the pipe to break the vacuum. That's probably another issue with the 1" pipe; you'd need a really small hose to fit in there and leave a gap.

Because there was no air gap and the tee in the galvi (where the PVC enters the vertical stack) is below the bottom of the washing machine, it is indeed a siphon effect. (At least I'm guessing that this is the arrangement).
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Old 10-18-2008, 02:34 AM   #7
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I would just bite the bullet and replumb this once and for all or you're going to have problems forever with it.
Good luck!
Mike

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