How to Make a Standpipe in a Basement

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One of the most important things you can do to help prevent basement flooding is install a standpipe in all the basement floor drains. Standpipes usually are installed 2 to 3 feet above the basement floor level. This allows any backflowing water to rise up into the pipe rather than onto the basement floor. You can make a standpipe for your basement with the proper tools, materials and do-it-yourself ability.

Things You'll Need

  • Flathead screwdriver
  • Phillips screwdriver
  • Expandable drain gasket
  • Pipe thread sealing tape
  • Galvanized 1.5-inch-diameter steel pipe, 2-foot length
  • Pipe wrench
  • Locate the basement floor drain.

  • Remove the grate screws from the drain grate. Turn the screws counterclockwise using the appropriate screwdriver.

  • Remove the grate from the floor drain by prying it up with a flathead screwdriver.

  • Insert an expandable drain gasket into the drain pipe opening. Ensure the expansion screw heads on the gasket flange are facing up.

  • Tighten each of the expansion screws clockwise one full turn at a time in rotation until the gasket is firmly secured within the drain pipe.

  • Apply pipe thread sealing tape clockwise around one threaded end of a 2-foot length of 1.5-inch-diameter galvanized steel pipe.

  • Install the threaded end of the standpipe into the threaded center of the drain gasket. Turn the standpipe clockwise until snug.

  • Tighten the standpipe using a pipe wrench.

  • Repeat Steps 2-8 on all additional basement floor drains.

Tips & Warnings

  • The principle behind standpipes is that the pressure of the water flowing into a basement is countered by the pressure of the water in the standpipe.

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