How do I replace a wax toilet flange on lead pipe?

We are middle unit condo originally built in 1904. My newish toilet flange leaked due to toilet bolts being loose, need to replace rotted subfloor, new tile and new wax flange. Need to keep original lead sewage pipe. How do I prep he surface? Any tricks at getting remaining old wax off? Any special prep or ticks in laying new one in? What should I look for to determine if lead pipe needs to be replaced? Bottom unit ceiling is open for several days so want to do all possible upgrades but don't want to be wasteful. Appears joints in lead sewage pipe are not to code and are steel, not rubber. How bad is that?

Any and all help for all these questions greatly appreciated.How do I replace a wax toilet flange on lead pipe?If the ceiling is open, now is the time to replace the 103 year old lead pipe. It will be much easier to do it now and a lot less costly than after the room is put back together. The job is not that hard to do if you have confidence in your plumbing abilities. Change the lead to plastic. Do not install the new closet flange until the finish floor is in. This way you get a proper seal between the toilet and the flange and will not have to replace the floor again.How do I replace a wax toilet flange on lead pipe?The waste stack should be cast iron. The joint is made of lead in the tee and the lead pipe is attached to a brass fitting which is in the tee. Look on the tee to see if the cast iron is either service weight (sv) or extra heavy (xh). There are rubber gaskets available to make the connection.

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How do I replace a wax toilet flange on lead pipe?The wax ring should go over the pipe just like any other pipe and, make sure you clean all the wax over, nothing special.

Are you sure your looking at the joint? it should have a twisted hemp tar rope, pounded down into the joint, then lead melted in on top. Not steel.