• In this video, learn how to install a new, leak-proof CPVC plastic water-supply system with This Old House plumbing and heating expert Richard Trethewey.

    1. Use drywall saw to cut open walls and ceilings to expose the polybutylene water-supply pipes.

    2. Turn off the water to the house, then cut out the existing polybutylene pipes using a plastic pipe cutter.

    3. Install new CPVC water pipe; glue pipe to fittings with CPVC primer and cement.
    • Depends on size of home, complexity of the existing water-supply system, and extent of damage to the old polybutylene pipes.
    • Overall costs depend on size and complexity of existing system
    • Difficulty: None
      Difficult, requires expert plumbing skills and experience in dealing with plastic piping

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      Video Directory

      Selected Topic/Section

      Tools List

      • drywall saw
        Drywall saw, used to cut open walls and ceilings to access old polybutylene piping
      • pvc pipe cutter
        Plastic pipe cutter, for cutting old polybutylene pipe and new CPVC pipe
      • propane torch
        Propane torch, used to sweat on copper adapters
      • pipe wrench
        Wrench, used to tighten female adapter into shower valve

      Shopping List

      1. CPVC plastic water pipe and assorted fittings

      2. PVC primer and cement

      3. Bucket, used to catch water

      4. Copper female adapter

      5. Solder, flux and emery cloth, for soldering on adapters