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Old 11-30-2013, 08:28 PM   #1
carlo77
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Default Adding washing machine drain to second floor 3" stack vent -please help?????

Can anyone give me advise on this.

We are adding a stacked washer and dryer the the 2nd floor (upstairs) of out 2 story house. I opened up the linen closet in the hallway and framed a larger space for the washer and dryer. This closet is by the back wall of our bathroom. When I cut open the drywall I located a 3" pipe which comes up from the toilet drain and goes straight up to the attic. It's pretty much right behind the toilet. My question is: can I tie into this 3" pipe with my 2" line. I would add a 3"x2" T. My concern is that it would be just above the toilet. Will this effect the venting of the toilet. Can I add an AAV to vent the 2" drain, as the fixture will be 5 1/2 feet away from the 3" stack. Any clarification would be appreciated.

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Old 11-30-2013, 09:25 PM   #2
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That should be fine as long as there are no fixtures connected to the stack above the washer drain. Of course the washer drain will need a trap. No other venting will be required.



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Old 12-01-2013, 12:44 PM   #3
phishfood
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I would be very concerned that the pumped discharge of the laundry would affect the trap seal of the toilet. I have heard of this very thing happening from people I trust.

To do it properly, you will need to tie into the stack below the attachment point for the bathroom.

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Old 12-01-2013, 01:12 PM   #4
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Quote:
Originally Posted by phishfood View Post
I would be very concerned that the pumped discharge of the laundry would affect the trap seal of the toilet. I have heard of this very thing happening from people I trust.

To do it properly, you will need to tie into the stack below the attachment point for the bathroom.
Sorry phfish this is I think the first time I disagree with you. If the stack was 2" then there would be a slight possibility it could effect he toilet. But with a 3" stack it wouldn't happen.
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Old 12-01-2013, 08:29 PM   #5
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John, have you had personal experience with tying a laundry into a 3" soil stack vent?

I have heard multiple accounts of having big problems with tying into a 2" vent, based on that I have always thought it a bad idea and would not recommend it. If you have personally done this several times and it worked well, then maybe I need to rethink my position on this.

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Old 12-01-2013, 09:57 PM   #6
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I can say that I have done just that many times. Don't see it that often down here as most homes are single story. But up north were 90% of my work was new construction and most homes were two story larger homes. It was common practice to put the laundry's on the second floor where the bedrooms were. What I most also say is the clothes washers were not the same as the newer ones today. In fact the codes on laundry drains were just starting to require 2" lines.

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Old 12-02-2013, 01:54 AM   #7
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You know, I have thought about this some more this afternoon.

According to IPC, which is the model code for Florida, this is technically against code. A wet vent for a bathroom can only receive waste from fixtures within that or another bathroom on the same floor, and IIRC, has a specific prohibition against fixtures with a pumped discharge.

But then again, a waste stack vent system with 3" pipe can serve 3 floors of laundries, something I have installed many hundreds of times without issue. So I don't think that this piping arrangement will cause problems, but it is against the code that I work under.



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