Finally tackling this bathroom - drain input, etc please!

wagon

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Hi there all
Long time lurker first time registering to post.
Got a lot of great info I have used to put together a functioning and not awful master bath. Thank you TL and others.
Same house, basement 2 floors down. Strange house all around. Been updating and fixing plenty of things teaching myself along the way (literally everything except the flat roof section and some drywall skimming has been DIY, and it was empty for 5 years, leaking, cat house).

This bathroom is raised off the ground and everything around it is finished.
The city service comes in through the WALL not the floor. Maybe thats normal.
ALL of this was buried under the plywood floor, I had no idea if any cleanouts existed, they certainly werent going to be easily used.
On the upper floors the house has 2 stacks, so this was very surprising to find there is really only one terminating here.

Red - questions
Grey - ABS you probably cant see
Blue - laundry being added

1. Does this look like a cleanout, or fingers crossed a cleanout AND backflow protection? There really isnt any pipe to get back to fit one in...
2. This stack captures the rest of the house - is this a wet vent for the basement bath (assuming there are no other vents found)
3. Ive repaired a foundation crack above this but water still seeps in around the sewer pipe (within the collar) whats the best way to seal this penetration?
4. I want to replace the rub with a RH drain so guts are accessable from an inside wall. Forsee any issues rerouting this to the other side?
5. Plan to add laundry on the other side of the wall (washer and tub). See anywhere adding this makes sense yet (will take down tile walls soon)
6. DO tubs normally sit on 'joists' and not plywood? Pushing 280lbs, I cant believe this floor stayed up....
7. I assume there should be backflow protection on the rest of the house. Does this look like a good place for it? (there is a bar sink in the basement also, otherwise all upper levels)

If you made it this far, thank you
Plan to reframe and maybe use deck blocks to take weight.
Rough in the reversed tub and laundry before putting mostly new back in with a thicker plywood.

Everything drains perfectly in the house currently....

oMWTvtB.jpeg
 

Breplum

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i'm not going to get into the weeds tonight.
first Q: is this below grade? if so, then it needs a backflow device outside to serve only the below grade plumbing. The rest of the house drainage would need to be tied in on the street side of the backflow device.

2. Based on limited view, the entire system for the basement is not to code, so there is no where to begin. Tear out and plumb to code.
 

wagon

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Not sure we have the same plumbing rules here.
There are no backflow valves outside the houses here, and there sure isnt a means to tie in multiple times to the city sewer.
 
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