How to Plug Basement Floor Drains During Floods

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Keep sewage out of your basement by blocking the floor drain.
Keep sewage out of your basement by blocking the floor drain. (Image: Jupiterimages/Photos.com/Getty Images)

When flood water overloads the main sewer lines, it backs up into the basement floor drains of many homes. To stop sewage backflowing into your home, you must physically block it. The easiest way to do this is with a drain plug. There are many types of drain plugs available at most home improvement stores. Most slide easily into the drain to block the flow of water in or out. They must be removed once the threat of flood is gone or interior water will not drain.

Things You'll Need

  • Measuring tape
  • Screwdriver
  • Wrench
  • Plumber's tape

Measure the diameter of your basement's floor drain. Take those measurements with you when you purchase the drain plug to find one of the right size.

Remove the floor drain's screws, unscrew it or simply lift it up to expose the pipe beneath it.

Place the plug into the floor drain pipe according to the manufacturer's instructions. If it contains threads that screw it into place, wrap plumber's tape around them before installation to make sure that the seal is watertight. Then screw it into the threads that held the drain cap in place. Non-threaded plugs may simply be pushed into place. If you have a floating drain, you must tighten the bolt on top of the plug with a wrench to expand the rubber band and secure the plug into place.

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