I'm finishing my basement bathroom that was roughed in by the builder 18 years ago. I pulled out the red plastic that was covering the pipe. My problems are:
1. They left the pipe a 1 1/2" below the concrete.
2. They didn't pour around it completely so there are voids. No concrete to screw down flange.
3. A closet flange fit's sloppy in the pipe. After talking to the guys at a plumbing supply they determined that the plumber had stubbed up to the floor with sewer and drain pipe. The o.d. is the same as schedule 40 but the i.d. is slightly bigger so a flange falls right in. At first glance it looks like schedule 40, but a touch bigger on the inside. Walls of the pipe are a 1/4 in. The stub is 15" deep.
My thinking is cut out the concrete around the stub, cut off the pipe to where I could glue a coupling on the existing pipe, and then stub up above the floor with schedule 40, leave it long, pour my cement back around the pipe, and they cut it off even with the finished floor and use an inside flange.
The existing pipe is 4". I don't mind going to the work if this would be the proper way to fix this.
Thanks for any replies, Tod