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How to Repair a Broken Clay Pipe

Updated February 21, 2017

Before building codes changed, homes used to have sewer pipe made of clay (or of lead or cast iron). Today, codes dictate that most sewer lines be made of either PVC or ABS (Acrylonitrile Butadiene Styrene) hard plastic pipe. When older clay pipe gets damaged, it needs to be fixed quickly as spilt wastewater can be a health hazard. This is done by cutting out the damaged clay pipe section and replacing it with the same diameter PVC pipe. The pipes join to each other with flexible rubber couplings.

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  1. Mark the clay sewer pipe six inches on each side of the broken/damaged area. Make a straight cut through the clay pipe at both marks using a reciprocating saw. Remove the cut section of pipe, and scrape off any clay fragments from the cut pipe ends with a utility knife.

  2. Measure between the two existing pipe cuts and cut a section of PVC sewer pipe to this length (use a handsaw, circular saw or mitre saw). Scrape away burrs from the cut pipe end.

  3. Wet the outside ends of the clay pipe cuts with water. Push a flexible rubber coupling fully onto each clay pipe end. Wet the outside PVC pipe ends and position the PVC pipe section between the clay pipe ends. Push both rubber couplings halfway onto the PVC pipe ends so that the couplings are half on the clay pipe and half on the PVC pipe. Tighten the metal hose clamps around the ends of each coupling with a screwdriver.

  4. Tip

    If a reciprocating saw is not available to cut the clay pipe, use a hacksaw.

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Things You'll Need

  • Tape measure
  • Marker pen
  • Reciprocating saw
  • Utility knife
  • PVC sewer pipe
  • Handsaw
  • Water
  • Flexible rubber couplings (2)
  • Screwdriver

About the Author

Steve Sloane started working as a freelance writer in 2007. He has written articles for various websites, using more than a decade of DIY experience to cover mostly construction-related topics. He also writes movie reviews for Inland SoCal. Sloane holds a Bachelor of Arts in creative writing and film theory from the University of California, Riverside.

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