Replace Cast Drain Line

[Dalton Dellinger]

Hello BP. I am working on my first flip. I have tried calling 6 plumbers in the area over the course of two weeks and only one of them has called back/answered the phone. I've come to the conclusion that I am going to do the plumbing myself.

That being said, I have the main sewer line coming up out of the floor in the basement. It then goes into a PVC Y pipe and then back into a cast drain/vent pipe. I'm wanting all new drain lines. Should I replace every from the roof vent down with PVC or should I try to salvage the cast pipe? Any and all input is appreciated. Thank you!