We've removed the particle board in our 1960's bathroom and plan to use cement board under new tile. The problem is we can't agree on how to lay the cement board. I think the metal flange (to copper pipe) needs to be removed so that the subfloor and tile can be properly placed beneath the flange. My spouse isn't sure how to remove the flange, so wants to leave it and work around it.

Any suggestions to settle the dispute? If the suggestion is to remove the flange. How is this accomplished?

Thank you.

Is the flange brass soldered to the copper pipe? If you leave the flange alone how much will it be below the floor line after the floor's finished?
Don't forget that you have a 4" horn on the bowl that will extend below the floor line and they make a wax seal with a funnel. Regards, tom

I'm not sure if it is soldered, but it seems to be very solidly attached. There is some white residue around where I would guess is the joint.

Because we are using slate tile and the old floor was linoleum, the cement board (replacing old particle board) will be below the flange by 1/4-1/2", but the tile will probably be higher than the flange by 1/4-1/2".

Thanks,
Carrie

Don't forget that you have a 4" horn on the bowl that will extend below the floor line and they make a wax seal with a funnel.
Leaving the flange alone and using a wax seal with a funnel might just be your best bet. Regards, Tom