Connect Washing Machine Drain to Main Stack

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Old 11-10-08, 08:17 PM
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Connect Washing Machine Drain to Main Stack

I have a 4" stack that goes from the basement all the way up through the roof. On the main floor, there is a toilet connected into the stack and then a sink & bathtub that have drains connecting together and then into the main stack via a Wye directly under where the toilet connects. Is it OK to put another Wye in the stack down in the basement in order to drain a washing machine? This Wye would be somewhere below the one that connects the tub/sink drains and would then have a trap before having the washer connected to it.
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Old 11-16-08, 10:57 AM
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Yes, that should be fine.
I did the same thing in my basement.
 
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Old 11-16-08, 05:42 PM
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Cutting in a drain as specified can be done and will most likely work just fine, but according to code a vent will also be needed someplace between the p-trap and where you go down to tie into the stack, or the stack itself. If a vent is not included, you may have issues when a toilet is flushed from above causing the trap to siphon.

Most codes allow the use of a mechanical vent known as a Studor Vent, or Air Admittance Valve (AAV). I personally prefer the use of a conventional vent system if possible because of the lack of moving parts to break down, but if it is not possible, use the AAV and you will be all set.
 
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Old 11-16-08, 07:57 PM
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Thanks

Thanks for the responses. I'll plan to do the wye and will look into using an AAV. I hadn't thought about the toilet flushing causing a siphon that would empty the trap but that makes sense. So I wonder if this means that my bathtub is technically not connected correctly since it drains into a p-trap and then runs over to the main stuck under where the toilet is connected but doesn't have its own vent (?)
 
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Old 11-16-08, 10:40 PM
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Even though it is possible your tub may not be vented properly, there are many different ways to vent something on the same floor (branch interval), but I am assuming you are talking about putting the washing machine drain in the level below the bathroom, creating a new branch interval, requiring separate venting requirements.

I am not trying to over-confuse things here, but just explain that the tub may be vented ok even though it does not look like it.
 
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