Washing machine standpipe, main stack

[Jerkington]

I've looked at similar questions in these forums but I couldn't find anyone talking about tying in to a main stack when adding a standpipe for a washing machine.

I'd like to add a standpipe for a washing machine, in the basement.
I'm planning on tying in to a 4-inch stack that is coming down from the second floor bathroom.
Will any of these 3 options work?
Which is preferred?

Option 1: Tie in to the 4-inch stack with a 4x2 sanitee.
Option 2: Same as 1, but adding an AAV.
Option 3: Same as 1, but venting back up to the stack.

 

[Reach4]

#2 would meet code if that pipe was not a vent used below.

#1 would not meet code, but it would probably function.

#3 works if the vent connection went all of the way up to the second floor at least 6 inches above the flood level of the fixtures that use the vent that you tied into.

 

[Sponsor]

 

[Jerkington]

Thanks Reach4.

This is in the basement and nothing else is tied in to that stack below the point where I would tie-in, so it sounds like #2 is the way to go.

Your diagram was extremely helpful, too. Thanks!