How To Build A Shower Pan On Concrete Floor

Essential Steps to Building a Shower Pan on a Concrete Floor

Constructing a shower pan on a concrete floor requires careful planning and execution to ensure proper water containment and drainage. Here's a comprehensive guide outlining the essential steps for a successful installation:

1. Prepare the Concrete Floor

Begin by ensuring the concrete floor is level and smooth. Repair any cracks or uneven areas using a concrete patch or leveling compound. Clean the floor thoroughly to remove dirt and debris that may interfere with the adhesive.

2. Apply a Bonding Primer

Apply a bonding primer to the concrete floor. This primer improves adhesion between the concrete and the shower pan liner, reducing the risk of leaks.

3. Spread Mortar

Use a notched trowel to spread a layer of mortar over the primed concrete floor. The mortar bed provides a stable base for the shower pan liner.

4. Install the Shower Pan Liner

Unroll the shower pan liner and position it on the mortar bed. Press the liner firmly into the mortar to ensure good contact. Trim any excess liner around the edges.

5. Seal the Joints

Use a high-quality sealant or adhesive to seal the joints between the shower pan liner and the concrete floor. This prevents water seepage and ensures a watertight installation.

6. Install the Drain

Insert the drain into the pre-cut opening in the shower pan liner. Secure the drain with screws or bolts to prevent leaks.

7. Pre-Slope the Mortar Bed

Apply a second layer of mortar to the shower pan liner, sloping it towards the drain. This pre-slope ensures proper water drainage and prevents pooling.

8. Install the Shower Curb

Build a shower curb using concrete blocks or bricks. Mortar the curb into place and seal the joints with caulk to prevent water from escaping.

9. Final Slope the Mortar Bed

Spread a final layer of mortar over the pre-sloped mortar bed, creating a smooth slope towards the drain. Ensure the slope is at least 1/4 inch per foot.

10. Install the Shower Tiles

Apply thin-set mortar to the sloped mortar bed and install the shower tiles. Grout the joints between the tiles to create a waterproof and aesthetic finish.

11. Seal the Shower

Apply a silicone-based sealant along all joints, including the shower curb, tile edges, and drain. This provides a final layer of protection against leaks.

Building a shower pan on a concrete floor requires attention to detail and proper execution. By following these essential steps, you can create a durable and watertight shower system.