How do you replace a 50 yr old piece of cast iron that has a hole in it and what do you replace it with? Is this a stand alone job or one to call the pros for?

Can u give us more info?

Size of hole?

Location of hole?

Horizontal or vertical?

Size of pipe?

Chuck

Cut out a length with a reciprocating saw like a Sawzall. Then 2 rubber and metal Fernco gaskets slip on the cut ends and a piece of ABS (easily cut with a hacksaw or the sawzall) goes in the middle, and then tighten the clamps with a screwdriver.
Make sure there aren't other weak spots first. Cut out enough to look inside, or tap hard with a hammer, or just replace it from one junction to the next. Leave enough for the gasket.
If this is a vertical run, code may not allow cast iron to be held up with plastic so check with the inspector or hire a plumber.

Ooops, I promised the plumbers that I would not answer plumbing questions, please ignore my response,

Hi guys

Chuck asked the important questions and we really need that info. To be able to tell Angeleyez anything really helpful.

If cutting the pipe is even needed, the big issues/concerns will be how to support the pipe to make the cuts. Here, if the pipes aren't supported properly people can get hurt or even killed (not to be dramatic, but... )! As Joypulv mentioned, code WILL NOT allow cast iron to be held up with plastic pipe, so don't plan on slipping a piece of plastic pipe into any vertical cast iron stacks, OK?

Clamp choice will also be important if you plan to transition between cast iron and plastic pipes (ABS or PVC)... need SHIELDED CLAMPS for this, but again, need more info. To advise properly!

Back to you AE...

Mark

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Ooops, I promised the plumbers that I would not answer plumbing questions

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Joy can work on one of my crews any time she wants a job. The best solution would be to follow her advice and cut and replace the pipe,
There is another option if the hole isn't too large and that's to patch the hole with a saddle clamp. (see image) in the same size as the pipe. All we need now is the size of the hole. Good luck, Tom