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Hey guys - I'll keep it short

SHORT VERSION
I want to add a shower in the downstairs bathroom. Post tension Concrete. There is a toilet that is pre-plumbed into the concrete and the drain vents to the wall where i want to install the drain for the tub. Would you.....A.) Chance chipping concrete to the toilet flange and install drain OR B.) (Please choose this one), Raise the tub to get a 1/4 inch per foot drain 3 feet to the toilet vent (2 inch pipe) and call it a day?

Also, if this has been asked before, please direct me to the link. Ive spent about 30 min looking but this website is MASSIVE.

Thanks in advance!


LONG VERSION -
I have a 2 story house (NO basement) that has post tension concrete slab built in 2004. I am the 2nd owner. They prefabed these models and let the new home owners opt into or out of features. One of the features is a full downstairs bathroom vs a 1/2 bath. Well they went with the later but the room itself is obviously built and meant for a tub/insert 31 x 60-63". GREAT! Im ready to install?...wait, they didn't prefab the drain into the slab for the shower? Oh CRUEL FATE! so now i either have to cut into the concrete and run the drain to the toilet (38 inches) or ...hmmmm....do i dare go behind the wall and dump into the air vent for the toilet? Am i crazy? Im crazy right? SO it's a 2 inch vent pipe coming off existing toilet drain into the main sewer. I figure, If i built a frame and had the tub sit on the frame to elevate it I could get a Y fitting onto the vent pipe and come up 4 1/4 inch from the to the pea trap the would barely fit just under the tub and frame. Yes, getting in and out of the tub will take some quick Yoga lessons but hey! i can shower downstairs and not wake up the wife when i play in the mud!


15 year DIY guy with 6 years plumbing experience, I am NOT a plumber (You guys are crazy good) but on my own house i'll make it not leak, drain and not explode and those are the important things...right?
 

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Hammered Thumb
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The steel should be in the same place whether they sleeved for the drain or not. Though I would never cut into the slab until having it scanned first, and then it would just be a small core with engineer's approval (no trenching or chipping). But as a slab on grade you wouldn't have any access to route your plumbing branch anyway.

So plumb above slab.
 

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retired framer
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I have set a shower on a raised floor 8", it was not the end of the world to live with.
 

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Cutting a tensioning cable is bad, don’t risk it. Whatever it takes, don’t cut the floor if you don’t know where cables are located. They can be found by xraying the floor, not a DIY thing. I would raise the shower if it is not too much.
 

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retired framer
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These guys dig into it without damaging the cable to modify the slab.

 
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