Doing a little bathroom remodel, including putting in a subfloor. The
current floor is concrete, and the toilet sits directly on the floor, as
near as I can tell. I'm going to need to raise the flange up 2 1/4" to be
level with the floor. I'm not sure if there'll be any way to extend the
current pipe up, as I suspect that it's set into the concrete. Are there
fittings available to attach to a flange, and install another flange above
that? Or should I get out the sledge and replumb the whole flange to the
level of the floor?
Tim is right. And there are different ones for each app.
OP needs to determine the size and material of the
existing install to get the correct one.
My house was that way. There is a flange you can get that the center pipe
part sticks down an inch or so and has an o-ring around it to fit inside
and seal with the existing pipe. Mine was a mess though, the concrete
seemed to have spilled over the top of the pipe when the house was made, I
had to beat some away and then get a flange with a size smaller and just
seal it with caulk as the one made for this wouldn't quite fit.
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