
Are you planning to install a new shower pan liner and mortar? Proper installation of the shower pan liner and mortar is crucial to prevent water leakage, which can cause damage to your floors and walls. This step-by-step guide will help you install a shower pan liner and mortar correctly and ensure a watertight seal.
Pre-installation Preparation

Before installing the shower pan liner and mortar, you need to prepare the shower base. Here are the steps to follow:
Gather Necessary Tools and Materials
To install the shower pan liner and mortar, you need the following tools and materials:
- Shower pan liner
- Mortar mix
- Trowel
- Utility knife
- Scissors
- Measuring tape
- Pencil
- Level
- Sandpaper
- Bucket
- Water
Make sure you have all the necessary tools and materials before starting the installation.
Measure and Cut the Liner
Measure the shower base’s length, width, and depth to determine the size of the liner you need. Add an extra 6 inches to the length and width to allow for overlap and fold the liner into the corners.
Use scissors or a utility knife to cut the liner to the required size. Make sure the liner covers the entire shower base and extends up the walls by at least 3 inches.
Prepare the Subfloor
The subfloor must be clean, level, and free of any debris. Use sandpaper to roughen the surface, ensuring the mortar adheres correctly. If the subfloor is uneven, use a self-leveling compound to level it.
Now that you have prepared the shower base let’s move to the next section, where we will discuss installing the shower pan liner.
Installing the Shower Pan Liner
Installing the shower pan liner is a crucial step in the installation process. Here are the steps to follow:
Placing the Liner in the Shower Base
Place the liner in the shower base, making sure it covers the entire area. Fold the liner into the corners and crease it for a better fit.
Securing the Liner to the Subfloor and Walls
Start at the center of the shower base, and use the trowel to press the liner into the mortar. Work from the center outwards, smoothing out any bubbles or wrinkles. Press the liner up the walls, making sure it overlaps the shower base by at least 3 inches.
Use nails or staples to secure the liner to the walls, making sure not to puncture the liner below the overlap. Cut off any excess liner using scissors or a utility knife.
Sealing the Seams and Corners
Seal the seams and corners using waterproofing tape or sealant. Apply the tape or sealant to the corners and seams, making sure it covers the entire area. Smooth out any bubbles or wrinkles using a trowel or your fingers.
Now you have installed the shower pan liner, let’s move to the next section, where we will discuss applying the mortar bed.
Applying the Mortar Bed
After installing the shower pan liner, the next step is to apply the mortar bed. Here are the steps to follow:
Mixing the Mortar
Mix the mortar according to the manufacturer’s instructions. Start by adding water to the mixing bucket, then slowly add the mortar mix while stirring continuously. Mix the mortar until it has a thick, smooth consistency.
Spreading the Mortar Bed Evenly
Start at the outer edges of the shower base and work your way towards the drain. Use the trowel to spread the mortar evenly, making sure it is at least 2 inches thick. Smooth out any bumps or ridges using the flat side of the trowel.
Sloping the Mortar Bed towards the Drain
The mortar bed should slope towards the drain at a rate of 1/4 inch per foot. Use the level to ensure the slope is consistent and to prevent any low spots where water can collect.
Once you have applied the mortar bed, let it cure for at least 24 hours before proceeding to the next step.
Installing the Drain Assembly
The final step in installing a shower pan liner and mortar is to install the drain assembly. Here are the steps to follow:
Attaching the Drain to the Liner
Remove the drain cover and apply a bead of silicone caulk around the edge of the drain flange. Insert the drain into the opening in the shower base, making sure it fits snugly. Tighten the bolts on the drain flange to secure it to the shower base.
Securing the Drain to the Subfloor
Apply a layer of mortar around the drain flange, making sure it is sloped towards the drain. Smooth out any bumps or ridges using the trowel. Let the mortar cure for at least 24 hours.
Testing for Leaks
Before using the shower, test the drain for leaks. Fill the shower base with water up to the level of the drain, then let it sit for at least 30 minutes. Check for any leaks around the drain and the seams of the liner. If there are no leaks, you can proceed to the final step.
Congratulations! You have successfully installed a shower pan liner and mortar.
Conclusion
Installing a shower pan liner and mortar is an essential part of any bathroom renovation or remodel. Proper installation is necessary to prevent water damage and ensure a watertight seal. By following the steps outlined in this guide, you can install a shower pan liner and mortar correctly and with confidence. Remember, always follow the manufacturer’s instructions and take your time to ensure a quality installation.
Installing the Drain Assembly
Installing the drain assembly is the final step in the installation process. Here are the steps to follow:
Attaching the Drain to the Liner
Insert the drain assembly into the hole in the liner. Make sure the drain flange is flush with the liner and the weep holes are facing the liner’s center. Apply a bead of sealant around the drain flange to ensure a watertight seal.
Securing the Drain to the Subfloor
Mix the mortar according to the manufacturer’s instructions. Spread the mortar around the drain, sloping it towards the center of the drain. Make sure the mortar is level and smooth.
Place the drain assembly onto the mortar bed, making sure it’s level. Press down on the drain assembly to secure it to the mortar bed. Allow the mortar to dry completely.
Testing for Leaks
Fill the shower base with water to check for leaks. Let the water sit for at least 24 hours and check for any signs of leakage. If there are no leaks, the installation is complete.
Conclusion
Proper installation of the shower pan liner and mortar is crucial to prevent water leakage and damage to your floors and walls. Following the steps outlined in this guide will ensure a watertight seal and prevent future issues.
Before installing the shower pan liner and mortar, make sure to gather all the necessary tools and materials. Measure and cut the liner to the required size and prepare the subfloor.
When installing the shower pan liner, make sure to place it correctly and secure it to the subfloor and walls. Seal the seams and corners using waterproofing tape or sealant.
Finally, when installing the drain assembly, make sure to attach it to the liner, secure it to the subfloor and test for leaks.
By following these steps, you can install a shower pan liner and mortar correctly and avoid any future water leakage issues.