how to install a bathtub on concrete floor

Installing a bathtub on a concrete floor can be a challenging but manageable DIY project. Here are the steps to guide you through the process:

Materials You’ll Need:

  • Bathtub
  • Bathtub drain kit
  • Bathtub faucet and handles (if not included with the bathtub)
  • Plumbing tools
  • Construction adhesive
  • Level
  • Shims
  • Cement backer board (optional)
  • Tile and tile adhesive (if tiling the bathtub area)
  • Grout and grout sealer (if tiling)
  • Safety glasses
  • Gloves
  • Caulk and caulk gun
  • Screws and anchors (for securing the bathtub flange)


  1. Prepare the Concrete Floor:
    • Ensure that the concrete floor is clean, level, and free of any debris or irregularities. If the floor is uneven, you may need to level it using a self-leveling compound or shims.
  2. Position the Bathtub:
    • Place the bathtub in its intended position to check for fit and alignment. Ensure that it is level by using a level and adding shims underneath the tub if necessary.
  3. Install the Drain:
    • Follow the manufacturer’s instructions to install the drain kit on the underside of the bathtub. This usually involves connecting the drain assembly and securing it in place.
  4. Install the Faucet and Handles:
    • If your bathtub does not come with a pre-installed faucet and handles, install them according to the manufacturer’s instructions.
  5. Apply Construction Adhesive:
    • Lift the bathtub slightly and apply a generous bead of construction adhesive to the bottom of the bathtub. Lower the bathtub into place, making sure it aligns with the drain and faucet openings.
  6. Secure the Bathtub:
    • Secure the bathtub in place by adding screws through the flange into the wall studs, if applicable. Use anchors if there are no wall studs to attach to. Ensure that the bathtub remains level during this process.
  7. Connect Plumbing:
    • Connect the drain and faucet handles to the plumbing according to the manufacturer’s instructions. Use Teflon tape or pipe joint compound to seal threaded connections properly.
  8. Tile Surround (Optional):
    • If you plan to tile the area around the bathtub, install cement backer board on the walls and follow standard tiling procedures. Allow the tiles and grout to set before proceeding.
  9. Seal Edges:
    • Seal the edges of the bathtub with caulk to prevent water from seeping underneath. Pay close attention to the joints between the tub and the wall, as well as the corners.
  10. Final Checks:
    • Ensure that the bathtub is securely anchored, level, and that all plumbing connections are leak-free.
    • Test the bathtub by running water to check for leaks.
    • Check for any gaps or voids around the bathtub and fill them with caulk or construction adhesive as needed.
  11. Finish the Surround (If Applicable):
    • If you’ve tiled the bathtub surround, grout the tiles and seal them with grout sealer. Follow the manufacturer’s recommendations for grout curing time.
  12. Install the Bathtub Faucet Trim:
    • Attach the trim for the bathtub faucet according to the manufacturer’s instructions.

Installing a bathtub on a concrete floor can be labor-intensive, so take your time and ensure each step is done correctly. If you’re not confident in your plumbing or tiling skills, consider hiring a professional plumber or contractor to assist with the installation. Additionally, always follow local building codes and regulations when performing any home improvement project.

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