There is a bad spot in the cast iron sewer pipe under the living room floor. I can remove the vanity in the bathroom next to it and cut out the floor to expose about 4 feet of the pipe upstream of it. Can I just slide in sections of 3″ PVC into it past the problem area and re-flange this toilet in the 3″ PVC since this is the last or furthest from the sewer exit on the other side of the house. There are no other drains into it until the other side of the living room. I had it filmed and know the exact location of the bad pipe. The whole house is a terrazio floor and I don’t want to cut it in the living room.

-Diane

Diane, sliding a piece of new pipe into the old cast iron pipe is not an option. But, you can remove the existing damaged cast iron pipe and replace it with a section of PVC or ABS pipe. You’ll need to use an approved transitional fitting (plastic to cast iron) and a toilet flange on the floor.

-Brian