Backfall or Belly issue - want some professional opinions
I recently had a plumber tell me that a sewer backup we had in our building is being caused by a backfall or a belly in our sewer line directly under our house. He gave us an estimate of $5,000-10,000 to repair this. He wants to break up the floor from our bathroom through the hallway and through one of our bedrooms (this is a slab house with no basement). I basically would like to ask some experts a couple of questions.
1. Is replacing the pipe the only way to repair a belly?
2. Is it necessary to tear up the whole of the foundation to replace or repair a belly?
I appreciate any and all answers. I want to fix this right but this is so much money and it will hurt my husband and I so much, I just want to be sure about making the decision to have this done.
Thank You in advance