How to Install a Bath Tub Drain in the Basement


Installing a bathtub's drain system means you must gain access to the underside of a bathtub. When the tub sits over a basement, you can access the drain pipes from under the tub, but you do not have this option with a bathtub in the basement. You can access the drain pipes from the wall directly behind the tub's overflow drain opening. If you cut an access hole, place a door over it to make future access easier.

Things You'll Need

  • Drywall saw
  • Drain key
  • Pipe wrench
  • Screwdriver
  • Tub drain kit
  • Hacksaw
  • Cut an access hole in the wall directly behind the bathtub's overflow drain opening. You can later place a door over the hole, allowing you to access the drain pipes and the tub's faucet connections.

  • Pull out the stopper from the drain opening and insert a drain key. Turn the dial on the drain key to expand it until it sits snugly in the drain, and then use a wrench to twist the key and drain body counterclockwise until the drain comes out of the tub.

  • Use a screwdriver to remove the anchor screws from the overflow drain's cover, and then remove the drain cover. Use your hands or a pipe wrench to disconnect the old drain pipes from the main drain pipe in the floor.

  • Assemble the pipes that come in the tub drain kit, and then hold the pipes into position under the tub. Use a hacksaw to trim off any portion of the tee that overlaps the drain pipe in the floor.

  • Replace the drain pipes under the tub and tighten the connection to the drain pipe in the floor. Have an assistant hold the drain pipes in place as you thread the new main drain body into the bottom of the tub. Use the drain key to tighten the drain body into the drain pipe, and then drive the anchors into the overflow drain cover to anchor it over the overflow drain opening.

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