How to Install Durock Behind Tubs


Durock is a type of cement board installed behind tubs and shower surrounds that is moisture and mold resistant to help protect your bathroom from water damage. It comes in 4-by-8-foot sections and is 1/2 inch or 1/4 inch thick. Durock is installed straight onto the studs of the walls just like drywall. It is then covered with tile and shower surround. Installing Durock behind a tub is no different from installing it any other place in the house.

Things You'll Need

  • Tape measure
  • Power drill
  • Durock screws
  • Utility knife
  • Durock cement board tape
  • Thinset mortar
  • Notched trowel
  • Run a tape measure along each wall of the bathroom and record the measurements. Measure both the height and width of the wall and determine how many sheets of Durock will be necessary for installation.

  • Place the first sheet of Durock horizontally at any corner of the room. Screw it straight to the studs with 1 5/8 inch Durock screws. Insert a screw every 8 inches up the first stud. Move to the next stud and repeat the process for all of the other studs behind the first sheet.

  • Place the second piece of Durock next to the first and leave a gap of 1/8 inch to allow for expansion. Install the second piece and all of the remaining pieces the same way. Cut the Durock to size with a utility knife to fit at the ends of the wall, if necessary. Score it multiple times and snap it into.

  • Cover up all of the seams between the sheets of Durock with self-adhesive Durock cement board tape. Run the tape over the seams and cut it off at the ends with scissors. Press it firmly into place by hand. Run your hands over the entire surface until the tape securely adheres to the Durock.

  • Apply thinset mortar over the durock tape. Spread out the mortar over the tape with a notched trowel. Cover the tape entirely with a 1/8 inch layer over the surface.

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