Q:

Is it safe to cut the post tension concrete slab foundation to fine sewer line for bathroom addition?

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No, You must first locate the P.T cables, and because you said it is to find a sewer line im guessing this is slab-on-grade and not a deck. The only method for locating post tension cables on slab-on-grade is with Ground Penetrating Radar. If its on a deck you can use Ground Penetrating Radar or Xray. If you cut a P.T. cable you can weaken the structure and cause damage. P.T cables are known to shoot out of the side of a building when cut. And repairing the broken cable is extremely costly. You can learn a little more about GPR at www.subsurfacepros.  more

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