Hi we are installing a toilet in the basement of our new home. There is already a 4 inch stub that was left by the contractors. I have a couple of questions.
1.What kind of flange do we need for it to be flush with the concrete? Should we just buy a 3" flange and glue it into the four inch drain?
2.Do we cut the stub flush with the concrete?
3. can you recommend a better (easier) way?
Thanks! -Dexter

Hi Dexter,

You didn't say but I'm assuming that your pipes are PVC.

1.What kind of flange do we need for it to be flush with the concrete? Should we just buy a 3" flange and glue it into the four inch drain?

You will purchase a 4" closet flange, a can of PVC glue and a can of primer.
Prime both the pipe and the stub up and glue the flange tight to the floor.

2.Do we cut the stub flush with the concrete?

You will first glue the flange and then cut the stub out tight to the flange.

3. can you recommend a better (easier) way?

I wish I could.

Good luck, Tom

Thanks for your quick reply. I have realized my problem as I was standing in the basement trying to figure out why your instructions wouldn't work. The problem is that the concrete has been poured all the way up to the stub, so there is no space for the flange to lay around. Should I drill the concrete out around the base of the stub?

Good morning Dexter,

One of the last things we do before a slab is poured is to put a styrofoam closet wrapper around the toilet stubups so they won't get cemented in.
Some times they get pushed under the pour a bit so you will have to take a hammer and see if you have a wrapper under the pour. These wrappers give you about a 3/4" of space all around the stub up for the flange to recess into.
If the plumber didn't leave you a closetwrapper then shame on him for doing a shoddy job and you'll have to take a hammer and chisel and make your own recess for the flange to set next to the floor. Good luck, Tom