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Old 08-10-2012, 05:38 PM   #16
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Great! Your diagram helps a lot! If I don't do the slop sink, do you still think I should do an AAV for the washer?
Yes,every trap needs a vent- there are multiple ways to achieve this. What I drew is called vertical wet venting- 2 traps are sharing a vent which also serves as a drain for the upper fixture. It is oversize- 2" in your case, to accommodate both drainage and air movement. In my area, this is limited to 1 story. There are other limitations but they don't apply here.

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Old 08-10-2012, 10:33 PM   #17
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E-plumber : That won't work, here due to :

Wet venting is limited to vertical drainage. Each wet vented section shall be a minimum of one pipe size larger than the minimum required drain for that section.

Since the washer and utility sinks both require a 2" drain, we would have to have a 3" line to tie into.

Of course it varies depending on location....
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Old 08-10-2012, 10:48 PM   #18
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E-plumber : That won't work, here due to :

Wet venting is limited to vertical drainage. Each wet vented section shall be a minimum of one pipe size larger than the minimum required drain for that section.

Since the washer and utility sinks both require a 2" drain, we would have to have a 3" line to tie into.

Of course it varies depending on location....
Ah, I stand corrected. You are correct-at least in our neck of the woods. I was sort of multi-tasking while posting.
Well then, lets change it to a 2" fixture cross on top of a 90, eh?
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Old 08-10-2012, 10:56 PM   #19
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Ah, I stand corrected. You are correct-at least in our neck of the woods. I was sort of multi-tasking while posting.
Well then, lets change it to a 2" fixture cross on top of a 90, eh?
I don't know what your local CW standpipe regulations are, but that would put our P-trap too high by code.

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Old 08-11-2012, 10:50 AM   #20
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So should I do it like this then?
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Old 08-11-2012, 12:25 PM   #21
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That'll work. Just keep your p trap low enough for the sink you plan to use and it can be a 1.5" trap arm

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