While there are certain underground applications for CIPP lining that clearly make sense, the amount of risk associated with CIPP lining within the building envelope has led the authors to conclude that CIPP is not a comparable alternative to pipe replacement of drain, waste and vent piping within the interior of a building. Before making an investment decision, it is always advisable for a property to explore all its options, including a repipe, to ensure their community is making the most informed decision possible about fixing its failing pipes.