If you’re looking to learn how to install wet room on concrete floor, you’re in the perfect spot! Wet rooms are a fantastic way to give your bathroom a modern, open feel while maximizing functionality. Although installing one on a concrete surface may seem tricky, it’s a rewarding project that can significantly enhance your home.

In this guide, we’ll cover everything from planning the layout to waterproofing the floor and walls. You’ll also find tips on creating the perfect drainage slope and choosing the right materials for a long-lasting finish.
Ready to start your wet room transformation? Keep reading to discover the essential steps for a smooth installation process!
What Is a Wet Room and Why Should You Install One?
A wet room is a fully waterproof bathroom where the shower area is level with the rest of the room. The entire floor is gently sloped to allow water to drain away, and a traditional enclosure does not confine the shower. This design creates a minimalistic look and is highly practical, especially in smaller spaces or for people with mobility issues.
Installing a wet room on a concrete floor has several benefits:
- Space optimization: Even the smallest bathrooms can feel open and spacious without bulky shower enclosures.
- Ease of cleaning: Cleaning a wet room is a breeze with fewer barriers and grout lines.
- Modern aesthetic: Wet rooms are trendy and sleek, offering a spa-like experience in your home.
Tools and Materials You’ll Need

Before diving into the installation, ensure you have the following tools and materials at the ready:
- Waterproof membrane (liquid or sheet-based)
- Shower tray former (for sloping the floor)
- Drain system (linear or point drain)
- Tile backer boards (for walls and floors)
- Flexible tile adhesive
- Waterproof grout
- Tiles (non-slip recommended for the floor)
- Trowel
- Screed mix (for leveling the concrete)
- Concrete primer
- Notched trowel and tile spacers
- Silicone sealant
- Spirit level
- Protective gloves and knee pads (for comfort and safety)
Let’s get started!
Step 1: Planning and Preparation
Like any home renovation project, a successful wet room installation begins with proper planning. First, determine your wet room’s layout and consider the drain’s position. Whether you opt for a point drain (centrally located) or a linear drain (along one side), this decision will affect how the floor slopes.
Drain Placement
Wet rooms rely on adequate drainage. You’ll need to install a drain system that fits snugly into the concrete on a concrete floor. A linear drain is often preferred as it requires a single slope, making tiling easier. Point drains, while still effective, need the floor to slope in multiple directions toward the center.
- Tip: Place the drain in a location that minimizes water pooling and ensures easy access for maintenance. If you’re remodeling an existing bathroom, you might need to adjust plumbing, so make sure this is accounted for.
Sloping the Floor
The key to a wet room is ensuring water drains effectively without leaking into the rest of the house. On a concrete floor, this involves creating a slight slope toward the drain, usually at a gradient of 1:100.
If your existing floor is level, you must create a slope using a shower tray former or a screed (a thin layer of mortar). Shower tray formers are pre-sloped, making installation easier, but if you’re confident in your DIY skills, you can create the slope manually with a screed.
Waterproofing Preparation
A wet room must be fully waterproofed to avoid water damage to the structure of your home. Concrete floors are solid but also porous, meaning water can seep through and cause issues over time. Prepping the surface is critical before waterproofing.
- Tip: Clean the concrete surface thoroughly, removing dust, debris, or grease. Apply a concrete primer to help the waterproofing membrane adhere to the surface.
Step 2: Installing the Drain and Preparing the Floor
Once your layout is finalized, it’s time to install the drain and prepare the concrete floor for waterproofing.
Installing the Drain
If you’re installing a linear or point drain, the first step is to create an opening in the concrete floor. This may involve cutting into the concrete to accommodate the drain. If you’re uncomfortable with this step, you can rent a concrete saw or consult a professional.
- Tip: Ensure the drain is positioned slightly lower than the rest of the floor to allow water to flow towards it naturally. Follow the manufacturer’s instructions for sealing the drain to the concrete to avoid future leaks.
Creating the Floor Slope
If you’re using a shower tray former, this part is easy: simply place the tray in the correct position and ensure it’s level before moving on. If you’re creating the slope manually, mix your screed and apply it to the concrete, working from the outer edges toward the drain. Use a spirit level to ensure the correct gradient.
Allow the screed or tray former to set before proceeding. Depending on the product used, this typically takes 24-48 hours.
Step 3: Waterproofing the Wet Room
Waterproofing is the most crucial step in the installation process. Any weak spots in the waterproofing layer can lead to costly repairs, so be meticulous here.
Applying Waterproof Membrane
Once your floor is sloped and dry, it’s time to waterproof the entire area. There are two main types of waterproofing membranes: liquid-based and sheet membranes.
- Liquid Membrane: This is applied using a roller or brush, much like painting. Start at the corners and work your way across the entire surface, ensuring even coverage.
- Sheet Membrane: These are applied in large sheets that adhere to the surface. Overlap the edges by several inches and seal the seams with waterproof tape.
Cover the floor and walls to at least 6-8 inches above floor level (or all the way up for a full wet room). Pay extra attention to corners and around the drain.
Sealing Joints and Edges
For areas where the wall meets the floor or around the drain, use waterproof tape or a liquid sealant to ensure no water can seep through. Apply multiple membrane coats, waiting for each coat to dry thoroughly before applying the next.
- Tip: Some professionals recommend installing a secondary waterproof membrane for added protection, especially in high-use wet rooms.
Step 4: Installing Tile Backer Boards and Tiling
With the waterproofing complete, it’s time to install tile backer boards and start tiling.
Installing Tile Backer Boards
Tile backer boards provide a solid, waterproof surface to which tiles can adhere. They’re crucial in wet rooms because they add a layer of moisture protection. Secure the backer boards to the walls and floor using waterproof screws or adhesive.
Ensure no gaps exist between the boards, and tape the seams with waterproof tape. Some backer boards come pre-sealed, while others need an additional layer of waterproofing membrane applied after installation.
Tiling the Floor and Walls
Now comes the fun part—laying the tiles! For the floor, it’s essential to use slip-resistant tiles, as wet rooms tend to be more slippery than traditional bathrooms. Smaller tiles with more grout lines provide additional traction.
- Tip: Start from the drain and work outward, ensuring the tiles follow the slope you’ve created. Use tile spacers to maintain even spacing and a notched trowel to apply the adhesive.
For the walls, you have more freedom in terms of tile choice. Larger tiles can create a seamless, contemporary look, but use a flexible tile adhesive to accommodate slight movement in the structure over time.
Once the tiles are laid, allow the adhesive to dry for 24 hours.
Step 5: Grouting and Sealing
With your tiles in place, it’s time to finish the job by grouting and sealing.
Grouting the Tiles
Use waterproof grout to fill the gaps between the tiles. Apply the grout using a rubber float, pressing it into the spaces between the tiles. Afterward, wipe away the excess grout with a damp sponge and allow it to set.
- Tip: Work in small sections to prevent the grout from drying before you can clean it off the tiles.
Sealing the Tiles
Once the grout is fully cured (usually after 24-48 hours), apply a silicone sealant around the room’s edges and the drain to prevent water from seeping through. This is the final barrier between your wet room and any potential water damage.
Step 6: Final Touches and Maintenance
After the sealing process, the only thing left is the finishing touches. Install any remaining fixtures, such as towel rails, showerheads, or shelving. Ensure that everything is securely fixed to the walls, as you want to avoid drilling into the waterproof membrane.
Ventilation
Good ventilation prevents mold and mildew buildup in your wet room. Consider installing a small, powerful exhaust fan if your room lacks adequate ventilation.
Regular Maintenance
Keep your wet room in tip-top shape by regularly cleaning the tiles and grout to prevent the buildup of mold or soap scum. A garage flooring professional can assist with sealing the grout periodically, which helps maintain its water resistance.
Frequently Asked Questions (FAQs) on How to Install Wet Room on Concrete Floor
How to tank a wet room on a concrete floor?
Tanking a wet room involves waterproofing the entire floor and walls to prevent moisture from penetrating the concrete. Start by applying a liquid waterproof membrane or boards, sealing all joints and corners. This creates a fully watertight barrier, ensuring long-term protection against water damage.
What do you put on the floor of a wet room?
The floor of a wet room should be covered with non-slip, waterproof materials like tiles, vinyl, or specialized wet room flooring. These surfaces are designed to handle constant moisture exposure while providing grip to prevent slipping. Proper drainage and waterproofing are essential to ensure a functional wet room.
What do you put on a wet concrete floor?
A waterproof membrane or epoxy coating is ideal for wet concrete floors. These materials create a watertight barrier, preventing moisture from penetrating the concrete. This is crucial in areas prone to dampness, such as basements or garages, where water can lead to long-term structural issues if left unchecked.
How do I stop moisture from coming up on my concrete floor?
To stop moisture from rising through your concrete floor, apply a vapor barrier or moisture-resistant sealant to the surface. These barriers prevent moisture from seeping through, protecting the concrete and any flooring above it. Proper ventilation and maintaining low indoor humidity also help reduce moisture issues.
How to seal concrete floor from water?
Use a waterproof sealer or epoxy coating to seal a concrete floor from water. These products penetrate the concrete, creating a durable, moisture-resistant barrier. Applying the sealer evenly and ensuring it covers all cracks and pores is essential for long-lasting protection against water damage.
Conclusion
Installing a wet room on a concrete floor can seem like a big project, but with careful planning and execution, it’s an attainable and rewarding home improvement. By following this guide, you can transform your bathroom into a stylish, functional space that is built to last.
From sloping the floor for proper drainage to ensuring that every inch is thoroughly waterproofed, the attention to detail at each step ensures your wet room will perform beautifully. Whether you’re working with a small space or designing a spa-like retreat, a wet room adds both luxury and value to your home. So grab your tools, and dive into creating the wet room of your dreams—your concrete floor is ready!
End Note
At The Garage Floor Company, we don’t just handle garages—we also offer professional flooring solutions for various spaces, including wet rooms. Let our expertise guide you if you’re considering installing a wet room on a concrete floor. Our commercial flooring options are durable, moisture-resistant, and ideal for wet environments, ensuring a long-lasting and safe installation.
We provide services in Omaha, Lincoln, Indianapolis, and other areas. Check out our video gallery and before & after gallery to see the quality of our work. Need more tips or advice? Head over to our blog or get in touch via our contact page. We’re always happy to help!