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How to Install a Flood Control System

Keeping sewage at bay with This Old House host Kevin O'Connor and plumbing contractor Dennis Langowski.

In this video, This Old House host Kevin O'Connor and plumbing contractor Dennis Langowski keep sewage at bay.

Steps for Installing a Flood Control System

  1. Dig up and remove the existing backwater-valve flood control system.
  2. Unscrew the couplings holding the existing check valve to the sewer pipe, then remove and discard the check valve.
  3. Install a new cast-iron, twin check valve to the sewer line.
  4. Secure each end of the new check valve with flexible rubber couplings.
  5. Pour bags of ready-mix concrete around and under the ends of the new check valve.
  6. Spread a layer of gravel over the concrete, and then soak with water.
  7. Cover the bottom of the hole with a thick layer of sand.
  8. Use curved concrete block to build a circular wall around the valve.
  9. Bring the block wall even with the surrounding grade, then top with an access cover.

Tools: