How to Build a Shower Curb From Durock

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While the traditional way to make a shower curb for a shower is to first build the curb out of 2-by-4 material and then cover it with wire mesh, the vinyl liner for the shower pan and then a coat of cement that is covered by ceramic tile or natural stone, you can also use Durock. The overall process is exactly the same, with the 2-by-4 material forming the base, but instead of mesh, liner and cement being used, the wood is covered with Durock and then waterproofed to provide a base for the tile.

Things You'll Need

  • Safety glasses
  • Dust mask
  • Work gloves
  • Drill
  • 3-inch wood screws
  • 1 1/2-inch wood screws
  • Tape measure
  • Pencil
  • 2-by-4 material
  • Miter saw
  • Utility knife
  • Thinset mortar
  • Bucket
  • Margin trowel
  • 1/8-inch notched trowel
  • Measure the width of your shower opening where the curb will be located. Cut at least three pieces of 2-by-4 material down to length. Lay the first piece down across your opening and screw it into the floor with 3-inch wood screws placed every few inches. Add another piece on top of that one and screw it down, then add the third piece and screw it onto the second. You can place a fourth if you want a higher curb.

  • Mix up some of the thinset mortar in a bucket with the margin trowel. You only need a couple of handfuls of dry mix and enough water to create a creamy mixture. Let the mixture sit. Measure the height and length of your Durock and cut two pieces down. Use a utility knife to score the face of the Durock and then snap it in half along the score mark.

  • Remix the thinset. Spread thinset onto the two sides of the curb with the notched trowel. Stick the two side pieces of Durock on. Mount them with the 1 1/2-inch wood screws spaced every three to four inches across, but keep at least 3/4 inch away from the outside edges. Measure the width and length of the top section of the curb and cut another piece of Durock down to size. Spread thinset on top of the curb and screw the top section down.

Tips & Warnings

  • Cover the curb with your preferred waterproofing protocol when you waterproof the rest of the shower pan and the shower walls and cover it with your preferred finish material.
  • Wear safety gear when working with power tools and mixing thinset mortar.

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  • Photo Credit Thomas Northcut/Photodisc/Getty Images
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