I'm planning on calling a plumber to give me an estimate on my bathroom addition. There is no basement, it is on the first floor on a concrete slab.
I already have a bathroom on the 2-nd floor right above. The cast iron vent pipe is going down through the existing bathroom and I'd like to connect the new toilet, sink to it. I'm also hoping for a shower too but if the breaking concrete will be required I might opt out.
Is breaking the concrete inevitable? I was hoping maybe the horizontal toilet could still be able to be attached at the bottom. Not sure about the shower as the piping will require a slope.
Best Answer
I believe you are trying to cram to much in too little of space. The best option is to break the floor, and repair it, it will save you the "step up" you are creating with the 2X4 sleepers on the slab.
You may be able to find a plumber or perhaps DIY the cutting of the stack and tying in a line to the toilet that flushes through the wall. They are out there but it looks like your soil stack is too tight in the corner. You need to find a way to get the soil pipe out of the wall at the 15" mark. Code requires 30" for the area a toilet sets in, 15" is the center line of that space.
Actually the info I just gave will be wrong to a degree. You will need a vent for the new toilet and it will most likely be illegal to tie it into a line that directly serves another toilet with out another branch coming off of the main to serve the new toilet.