I'm working on putting in a new half bathroom in my home that will be located in the basement on the concrete slab. I have cut a hole in the slab and finished all the plumbing for the toilet, and I'm ready to pour new concrete in the hole. Right now I have a 4" pipe stubbed straight up about a foot above ground level. What I'm unsure about is: What is the best method to install the toilet flange in this situation? Should I pour the concrete first, cut the stubbed pipe level with the concrete floor, and then attach a 3-or-4" inside-fitting flange that sits inside the pipe? OR, should I put a 4" outside-fitting flange on around the pipe first about level with the finished floor and then pour my concrete leaving room to tile underneath the flange?

pour tight to the pipe
when you are ready to finish, cut the pipe flush with floor and install a flush fit flange that inserts into the pipe.

try to find one with a stainless steel ring...

cut flush with FINISHED (tiled) floor



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"Measure Twice & Cut Once" - Retired U.A. Local 1 & 638

I'd wrap cardboard, foam, or similar around the pipe to be dug out after the slab sets, leaving room for an outside ring. It is a less restricted, in my book better, hook-up. Plus, if there is ever a problem with the ring you have the option of repairing it by using an inside ring on top of what is there - an easy fix.

ditto - good point about future repair

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"Measure Twice & Cut Once" - Retired U.A. Local 1 & 638

That is the way I ALWAYS do it, but I seem to be a voice crying in the wilderness, compared to how everyone seems to want to do it.

so, like the boy scout marching in the parade who happened to be out of step.
his mother commented that "everyone is out of step but my johhny"..
anyway, would you also treat cast iron the same way?

quote; , would you also treat cast iron the same way?

Of course, because that is the way it was done originally, and should still be done, with cast iron. If the drill master is out of step, then the troupe is wrong.