My house's sewer system is encased in the basement floor, and there are sections of the old cast iron system that need to be replaced, including two old floor drains and a rusty section of the kitchen sink drain where it meets the concrete floor.
I understand that replacing these parts of my sewer will mean cutting into the concrete floor. But is there a way to install the new drains such that they can be serviced without concrete work? I know that it's common to install shower rough-ins in a pit of sand, then cover it with a tile. Can that also be done for other parts of a basement sewer system, like a floor drain? If that's not a good idea, why not?