I am posting on behalf of DH:
"I'm installing a bathroom in my basement and I'm at the portion of installing the toilet. We have a slab basement floor, and the builder (1980s) left about 9" of 3” ABS pipe sticking out of the concrete where the toilet should go. My question is on the flange. Please tell me if I'm wrong on any of the following, and suggest any steps I am missing.

I was going to cut the pipe off flush with the floor, and then get a plastic flange with a molded piece of female pipe in the center to be “glued” inside the pipe in the floor. My only concern with this is that these flanges have a lip on the bottom in the middle that will not allow the flange to sit flat on the floor. It's up about 1/8” – 3/16” high. The other issue is if the flange cranks over time, There would be no way of replacing it without breaking up the concrete.

http://img45.imageshack.us/img45/9098/flangelz8.jpg


What sort of flange do I need and how does the one you suggest create a good seal AND be repairable and all this without having to bust up concrete? Thanks for any suggestions you have!



Kath

Your fears are needless. The inside flange will be just fine since the toilet bowl doesn't set flat on the floor and the extra quarter or three sixteenths isn't going to affect it a bit. As far as replacing the flange, they won't crack unless you get too frisky tightening the closet bolts and if it does crack there are repair kits on the market for just that problem. Good luck, Tom