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You will either have to break up the concrete to tie into the under-slab main waste pipe, or you will need to build a subfloor high enough to run the drain pipes underneath, and then connect into the main drain above grade. Keep in mind that you will need some amount of fall (slope) on the pipe, and that you will also need to tie in to the vent stack, or run a new vent through the roof. This should be 4"ABS for a toilet, and 1 1/2" - 2"ABS for a sink or shower.

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Q: How do you add and additional bathroom when you have a slab floor?
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