I am installing a new bathroom in the basement that was rough in by the plumber. I have a cast iron pipe for the toilet rough in. What do I use to cut the cast iron pipe to the correct height, and what is the correct height. I am also installing ceramic tile to the floor. Do I install the flange on the concrete floor or the ceramic tile or do I raise the flange up with a small piece of plywood surrounding the pipe to meet the height of the tile and then secure all to the concrete floor.
Thanks for your help.

I would take a set of ratchet cutters and cut the pipe off as close to the floor as possible. Now tile the floor leaving a little space around the pipe for the flange. If there's still a little pipe sticking up I take a adjustable wrench and "nibble" around the cast iron until I bring it to grade.
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Good luck, tom

I am installing a new bathroom in the basement that was rough in by the plumber. I have a cast iron pipe for the toilet rough in. What do I use to cut the cast iron pipe to the correct height, and what is the correct height. I am also installing ceramic tile to the floor. Do I install the flange on the concrete floor or the ceramic tile or do i raise the flange up with a small piece of plywood surrounding the pipe to meet the height of the tile and then secure all to the concrete floor.
Thanks for your help.

If it were me, I would install a 'torque-set closet flange (http://www.plumbingsupply.com/images/jonespec-cf-2980.gif)'.

You'll likely have to use a chipping hammer to recess the bottom portion of the flange into the concrete.

After setting the top of the flange to the correct height, I would trim off the excess cast-iron pipe protruding through the top of the flange with an angle grinder fitted with a cut-off wheel or a diamond wheel.