how to fix a dip in a bathtub

Fixing a dip or sag in a bathtub is an important maintenance task, as it can lead to water pooling, potential leaks, and an uncomfortable bathing experience. Here are the steps to fix a dip in a bathtub:

Materials You’ll Need:

  1. Safety Gear: Safety glasses, gloves, and a dust mask for protection.
  2. Support Material: Plywood or a suitable support material.
  3. Measuring Tape: To measure the area and depth of the dip.
  4. Circular Saw or Jigsaw: To cut the support material to the required size and shape.
  5. Construction Adhesive: To secure the support material in place.
  6. Screws: Appropriate screws for securing the support material.
  7. Level: To ensure that the bathtub is level and properly supported.
  8. Tile and Grout (if necessary): In case any tiles need to be removed and replaced.


  1. Safety First:
    • Put on safety glasses, gloves, and a dust mask to protect yourself during the repair process.
  2. Assess the Damage:
    • Determine the extent of the dip in the bathtub. Measure the area and depth of the dip to understand the scope of the repair.
  3. Remove any Tiles (if necessary):
    • If the dip is localized and caused by damaged tiles, carefully remove the affected tiles using a tile removal tool or chisel. Be cautious not to damage surrounding tiles.
  4. Cut the Support Material:
    • Cut a piece of plywood or suitable support material to match the size and shape of the area with the dip. Ensure it’s slightly smaller than the bathtub’s footprint.
  5. Apply Construction Adhesive:
    • Apply construction adhesive generously to the bottom of the support material. Ensure even coverage.
  6. Place the Support Material:
    • Carefully place the support material in the bathtub, positioning it directly under the area with the dip.
  7. Secure with Screws:
    • Use screws to secure the support material to the bathtub’s subfloor. Drive the screws through the bathtub’s bottom into the support material, ensuring a secure and level fit.
  8. Check for Level:
    • Use a level to verify that the bathtub is now level and that the dip has been corrected. Make any necessary adjustments by tightening or loosening the screws.
  9. Replace Tiles (if removed):
    • If you removed tiles earlier, replace them with new ones using tile adhesive and grout. Allow the adhesive and grout to cure according to the manufacturer’s instructions.
  10. Clean Up:
    • Clean up any excess adhesive, grout, or debris from the bathtub and surrounding area.
  11. Test the Repair:
    • Fill the bathtub with water and check for any signs of water pooling or unevenness. Ensure that the repair has resolved the dip.
  12. Seal Joints (if necessary):
    • If there are any gaps or joints between the support material and the bathtub, use a waterproof sealant to seal them to prevent water infiltration.

Fixing a dip in a bathtub can vary in complexity depending on the extent of the damage and the type of bathtub you have. If the dip is severe or you’re unsure about the repair process, it’s advisable to consult with a professional contractor or plumber who specializes in bathtub repairs to ensure a proper and long-lasting fix.