Do I need a new drain pipe?


I am constructing a porch with clawl space over the house to septic cast iron drain waste pipe. The present pipe is 30 years old. I have dug down to the pipe and it is in good shape. The pipe runs from the septic to the house under a slab floor to the basement. A plumber said that it would be a good idea to replace the cast iron from the tank to the house slab with plastic. I am wondering if this would be a good idea?
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snipped-for-privacy@dva.state.wi.us wrote:

How did you determine how good a shape it was/is in? Did you run a wall thickness test?
You're getting ready to cover this over to where it is going to be a _REAL_ pita to get to if you ever need to in the future--or for whoever is to come after.
Do it while you can. I'd even go so far as to suggest SCH 80 instead of just 40. There is going to be some way to get to it for cleanout if ever need to, I hope? You aren't going to affect access to the tank for cleanout, etc., are you? (just checking...)
Have similar potential problem here w/ old tile waste from interior cast...decided against covering it over and are rethinking the idea of similar project with the thought of probably moving the tank/exit line to avoid doing the same thing.
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