[Stubits]

We would like to add a second laundry closet to our home. Currently we have one in the basement (where my mother-in-law) lives, but we would like to add one so as to minimize the need to bother her when we do laundry. The proposed location for the new laundry closet is more or less immediately above the current one. Getting gas, electrical and water supply to the new location is rather easy, but I want to make sure that drain will work. The current setup is a little funky and I want to make sure it doesn't limit what I am able to do.

Please see the attached picture for the current setup. Due to some funky plumbing by the previous owner we decided to us an AAV to vent the bar sink and the washer. Beneath the slab it ties into a shower drain and then onto the main drain.

I am hoping to address two problems here, actually. Given some other work we will be doing, it will be possible to go from using an AAV to a roof vent, which I know is preferred. Is there anyway to tie in an additional washing machine, one floor above this setup without having to tear up the concrete slab (again!).

Thanks!

[Stubits]

Would this diagram work? There would be no additional fixtures above the upper level washing machine.

Would this work? If so, what size pipes would I need? Is PVC OK?