Can I put a 32” x 60” curbless shower in a post tension slab?
I’m assuming this must be carefully chipped out, you can’t just send someone in with a partner saw.
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The problem with a post-tension slab is that you, at this point, don't know where the tensioning bars/cables are nor do you know what parts of the slab are "structural".
Even if you can find the original documentation for the build, you will likely need to hire an engineer (i.e. one with a P.E. after his name) who is qualified with post-tensioned slabs and see if they can help you sort this out and give you safe solutions to your problem.
Otherwise, you may not be able to do what you want at all, at least not by cutting into the slab.