How To Install A Shower Pan Liner

A shower pan liner is an essential part of any shower installation. It is a waterproof barrier that prevents water from leaking into the subfloor or walls. A properly installed shower pan liner will ensure that your shower remains leak-free for years to come. In this article, we will discuss how to install a shower pan liner in easy-to-understand steps.

What You Will Need:

Before we begin, let’s gather the necessary tools and materials that you will need to install a shower pan liner.

  • Shower pan liner
  • Scissors or utility knife
  • Adhesive
  • Shower pan
  • Measuring tape
  • Marker

Step-by-Step Guide to Install a Shower Pan Liner:

Step 1: Prepare the Shower Base

Before you start installing the shower pan liner, make sure that the shower base is clean and free from debris. Also, ensure that the shower base is level and sloped towards the drain.

Step 2: Measure and Cut the Shower Pan Liner

Measure the length and width of the shower base and add a few extra inches to each measurement. Using the scissors or utility knife, cut the shower pan liner to size.

Step 3: Install the Shower Pan Liner

Lay the shower pan liner over the shower base, making sure that it covers the entire area. Press the liner into the corners and against the walls, and trim any excess material.

Step 4: Secure the Shower Pan Liner

Apply the adhesive to the shower pan liner, starting from the center and working your way outwards. Make sure that the adhesive is evenly spread, and press the liner firmly into place.

Step 5: Cut the Drain Hole

Using the marker, mark the location of the drain on the shower pan liner. Cut a small hole in the center of the marked area, and then cut an X shape from the hole to the edge.

Step 6: Install the Drain

Install the drain assembly according to the manufacturer’s instructions. Make sure that the drain is properly sealed to prevent any leaks.

Step 7: Seal the Shower Pan Liner

Apply a bead of silicone caulk around the edges of the shower pan liner, where it meets the walls and the drain. Smooth out the caulk with your finger or a caulk smoothing tool.

Step 8: Install the Shower Pan

Once the shower pan liner is installed and sealed, you can install the shower pan according to the manufacturer’s instructions.

Step 9: Test for Leaks

Fill the shower base with water and let it sit for a few hours. Check for any leaks around the edges, the drain, and the corners. If there are any leaks, reapply the caulk and test again.


Q: How long should the shower pan liner be?

A: The shower pan liner should be long enough to cover the entire shower base, with a few extra inches on all sides.

Q: Can I use any adhesive for the shower pan liner?

A: No, you should use an adhesive that is specifically designed for shower pan liners.

Q: How do I know if the shower base is level?

A: Use a level to check if the shower base is level. If it is not, use shims to level it out before installing the shower pan liner.


Installing a shower pan liner is an important step in any shower installation. By following these easy-to-understand steps, you can ensure that your shower remains leak-free for years to come. Remember to use the right tools and materials, and always follow the manufacturer’s instructions.