Your Questions › Category: Plumbing Questions › When Should You Upgrade Your Cast Iron Pipes To PVC? 0 Vote Up Vote Down Terry Ross Staff asked 3 years ago Print This PageWhen Should You Upgrade Your Cast Iron Pipes To PVC? 1 Answers 0 Vote Up Vote Down Terry Ross Staff answered 3 years ago Print This PageWhen you start having repeated problems, leaks and stoppages for example, or when those problems start to appear throughout the piping network, is the time to talk with your professional about the switch to PVC piping.