How to Build a DIY Shower Pan

Using Tile To Create a Custom Shower Floor in Your Bathroom

Modern Shower With Tiled Pan

chuckcollier / Getty Images

In This Article
Project Overview
  • Working Time: 3 days
  • Total Time: 8 hrs
  • Skill Level: Advanced
  • Estimated Cost: $400 to $1,000

A dependable, waterproof shower pan, or floor, is essential to the overall operation of the shower. But a shower pan isn't just about function. It's about how it looks and how it feels underfoot. Building a custom DIY shower pan from tile in a mortar bed can help you create the perfect floor for your shower that's both beautiful and waterproof. There's nothing you can use instead of a shower pan in an enclosed shower. The only time you won't need a pan is if you have a fully tiled wet room space without a shower enclosure. These instructions assume you are building a shower pan on plywood subflooring, but if you are building a DIY shower pan on concrete slab, you will need to consider a riser kit.


Though you can make your own shower pan, our experts say this project is best left to professionals and experienced tile setters.

Basics of Tiled Shower Pans

Shower basins are called pans, floors, or receptors. One popular way to create a shower pan is to install a pre-fabricated polyurethane or fiberglass pan. While pre-fabricated pans are a great convenience for do-it-yourselfers, the traditional way of building a shower pan with tile on a mortar base allows maximum creativity. You'll need various materials for a shower pan to build up several layers. The layers will create a slope toward the drain while keeping the surrounding materials waterproofed.

Preslope and Tar Paper

The shower pan preslope is a mortar base that creates the general tapered slope for the shower pan. This slope is later refined with a second bed of mortar. The preslope is laid on tar paper.

Waterproof Liner

The liner is a PVC or other polymer membrane that rests on top of the preslope. This liner is the last line of defense between water and the subfloor.

Top Slope

Resting above the waterproof membrane is a second bed of mortar that generally follows the same contours as the preslope.


The top shower pan floor covering is the tile. The tile is set in a thin bed of mortar or thinset. Later, grout is added to the tile seams.

Shower Curb

Three sides of the shower pan are bounded by shower walls. The curb is the open entry point where the user enters the shower. The curb is between two inches and six inches above the level of the shower drain.


The lower area of the shower walls should be open, with no cement boards in place yet.

What You'll Need

Equipment / Tools

  • Straight tile trowel
  • Notched trowel
  • Rubber tile float
  • Wet tile saw or rail tile cutter
  • Hammer
  • Tape measure
  • Pencil or chalk
  • Level
  • Bucket
  • Mortar mixing tray
  • Circular saw
  • Garden hoe
  • Caulking gun
  • Cordless drill
  • Utility knife


  • Tile
  • Bullnose tile
  • Dry mortar
  • Grout
  • Waterproofing membrane
  • Thinset mortar
  • Tile spacers
  • 1 one-by-six
  • Tar paper
  • Roofing nails
  • Silicone sealant


How To Build a DIY Shower Pan

  1. Block Between the Studs

    Cut two-by-six lumber to fit between the studs of the shower stall. Where you have obstructions such as pipes, use one-by-six lumber or use a router to create a groove to accommodate the obstruction. Blocking allows you to run the waterproofing material up the sides of the shower, which creates the DIY shower pan liner.

  2. Cover the Drain

    Use tape and plastic to cover up the shower drain so that the mortar and other debris will not clog it.

  3. Add the Tar Paper

    Cut and lay down the tar paper on the floor of the shower. Fasten it down with roofing nails or staples.

  4. Mix the Mortar

    In the mixing tray, mix the mortar with water, using a garden hoe. Use only a little bit of water at a time to maintain a stiff, peanut butter-like consistency.

  5. Spread the Mortar to the Borders

    Wearing waterproof gloves, dump the mixed mortar onto the shower floor. First by hand, then with the trowel, spread the mortar around the base, mounding it higher around the edges. Aim for a height of about 1-1/2 inches on the border.

  6. Taper Down the Mortar

    With the flat trowel, taper down the mortar towards the shower drain. Use the scrap piece of two-by-four and level to continually check the tapered slope. You can also use the two-by-four as a screed to smooth down the mortar. Let this mortar bed dry for at least 24 hours.

  7. Add Silicone to the Drain

    Remove the top section of the shower drain by unscrewing or unbolting it. Run a thin bead of silicone around the perimeter of the drain.

  8. Add the Shower Waterproofing Material

    Lay the waterproofing material on the floor of the shower, running it about five inches up each of the walls. Press the material firmly into the silicone on the shower drain. Fold the corners into place; do not cut the corner material. Nail the top of the waterproof material to the studs to prevent it from falling.

  9. Replace the Shower Drain Top Cap

    With the utility knife, create slits for the four bolts on the shower drain to protrude upward. Replace the top cap and screw or bolt it tightly into position. Cut out the hole for the shower drain.

  10. Add the Lower Section of Cement Boards

    You can now add the rest of the cement boards down to the level of the mortar bed.

  11. Add a Reference Line to the Walls

    With the rest of the shower drain temporarily in place, draw a pencil or chalk line around the perimeter of the walls to add a reference line, which represents the top of the tile. Use the scrap two-by-four to help estimate the slope from the walls down to the shower drain.

  12. Add the Top Mortar Layer

    Similar to the lower mortar layer that you created earlier, mix the mortar in the mixing tray, then dump it onto the floor of the shower. Build a high border around the perimeter of the shower, about 1/4-inch below the tile top perimeter line. With the trowel, taper down the mortar to the shower drain.


    This top mortar layer must be very smooth, so take your time with it.

  13. Install the Tile

    Spread out thinset with the notched trowel and press the tile into the thinset. Use tile spacers to maintain proper distance between tiles. Let the tile fully cure. Spread grout across the surface of the tile with the rubber tile float.

  • Can I use Quikrete for a shower pan?

    Quikrete makes two products that work well when building DIY shower pans. Use either Quikrete Floor Mud or Quikrete Sand/Topping Mix for the job.

  • What is the final thickness of a DIY shower pan?

    The base of a DIY shower pan needs to be about 2 to 3 inches thick at the edges before the tile is added.

  • What is the best base for a shower?

    Bases come in a variety of materials, from acrylic, molded stone, and fiberglass. Acrylic shower pans are the least expensive type of pan and can last for about 10 years before there could be a crack or leak. They might begin to flex a bit, which may need a fix. Top-quality cast iron shower pans are very costly yet also very durable and can last for decades.

  • What is the difference between a shower tray and a shower pan?

    There is no difference between a shower tray and a shower pan. However, if you hear the term shower base, that is the portion that sits below the tray/pan.