
Building a shower without a pan is possible, but it is important to carefully plan and execute the installation. One option is to create a wet room, where the entire bathroom floor is waterproofed, eliminating the need for a shower pan. Another option is to install a curbless shower, which offers a sleek and modern look, enhanced functionality, and accessibility for all ages. To ensure proper drainage and prevent water damage, the shower floor must be sloped correctly, and the entire bathroom should be waterproofed. Building codes typically require waterproofing the dry portion of the bathroom floor, and there are various products available, such as pre-sloped foam shower pans, that can assist in achieving the correct slope.
| Characteristics | Values |
|---|---|
| Type | Curbless/zero-threshold shower |
| Benefits | Modern look, functionality, accessibility, adaptability, safety, and makes the bathroom feel larger |
| Considerations | Requires careful planning and execution, may be more expensive, need to waterproof the entire bathroom, ensure the shower floor is sloped correctly to drain water |
| Installation Process | Install the drain, apply waterproofing, lay floor tile, install shower base, caulk joints and screw holes, use cement board on the floor and walls, install plumbing |
| Products | TruDEK Classic Base, Redi Free prefabricated shower pan, DuraPlan height-adjustable shower tray, HYDROBLOK shower pans |
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What You'll Learn

Waterproofing the entire bathroom floor
Waterproofing your entire bathroom floor is a great way to protect it from water damage, stains, and spills. Here are the steps you can follow to achieve this:
First, decide on the type of flooring you want to install. Common options for waterproof bathroom floors include tile, vinyl, laminate, and hardwood. Each option has its own advantages and disadvantages, so choose the one that best suits your needs and preferences.
If you opt for tile flooring, ensure that the grout is sealed or mixed with a waterproofing agent to make it waterproof. For vinyl flooring, glue-down vinyl planks are already waterproof, but if you install vinyl as a floating floor, waterproofing the subfloor is recommended for maximum protection. Water-resistant laminate flooring is created through a lamination process that seals it and makes it resistant to moisture and spills. If you choose hardwood, be aware that it is the most susceptible to water and humidity damage, so waterproofing is crucial.
Before installing your chosen flooring, prepare the surface by filling any cracks or gaps in the subfloor, as these can attract moisture and cause issues later on. If you're waterproofing a wood floor, sand it first with medium-grit sandpaper and then vacuum or sweep the floor until it's completely clean. Ensure proper ventilation during the waterproofing process by opening windows and using fans.
After preparing the surface, apply a layer of primer to the walls, extending up to about half a foot from the floor. If you're waterproofing a shower recess, apply the primer at least 6 feet up the wall. Allow the primer to dry for at least 4 hours or the minimum time recommended by the manufacturer.
Once the primer is dry, use a caulk gun and silicone seal to fill the seams between the floor and the wall. This step is crucial in ensuring that your floors are entirely waterproof. Allow the silicone to dry for 24 hours.
Next, install your chosen flooring according to the manufacturer's instructions, ensuring that it is properly sealed and waterproofed. If you're using tile, you may need to back butter the tile around the perimeter to create a slope away from the walls.
Finally, consider installing a floor drain to remove any water from leaks. This is especially important if you have a sunken bathroom, as it will prevent water from running out of the doorways in case of a significant leak.
By following these steps and choosing the appropriate flooring, you can effectively waterproof your entire bathroom floor, creating a functional and protected space.
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Using a shower pan
A shower pan is an essential component of a shower, as it collects water and directs it to the drain, preventing water from seeping into the subfloor and causing damage. While it is possible to build a shower without a pan, using a shower pan has several advantages and is a more common practice.
There are various types of shower pans available, including pre-formed pans made from materials like acrylic or cultured marble, and traditional mortar-based pans. Pre-formed shower pans are convenient and easy to install, as they come in standard sizes and only require basic installation procedures. They are also less labour-intensive and reduce the risk of errors compared to constructing a mortar shower pan.
If you opt for a mortar shower pan, you will need to create a sloped mortar bed to ensure proper drainage. This process involves marking the slope, pouring and levelling mortar, and ensuring it cures properly. You can use products like Oatey's Perfect Slope to simplify this process and ensure a perfectly sloped shower bed.
Once the shower pan is installed, it's important to test its waterproofing. This can be done by pouring water into the shower bed and letting it sit for a couple of hours. If the shower pan is properly installed and waterproofed, the water should not leak through.
Overall, using a shower pan provides a straightforward and reliable method for managing water runoff in a shower. It offers a simpler alternative to more complex shower constructions and helps protect your bathroom structure from water damage.
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Building a concrete curb
Prepare the Shower Area:
Start by measuring and marking the desired location of the concrete curb in your shower area. Ensure that you have a concrete floor or slab as a base for the curb. If you don't already have a concrete floor, you'll need to install one, ensuring it is level and smooth.
Build the Curb Framework:
You can build the curb using bricks or concrete blocks, or even untreated wood. If using wood, it is essential to add a barrier on the shower side and bond it to the floor. Untreated wood should be sealed with a suitable sealer to protect it from moisture.
Another option is to use 2x4s and cover them with cement board or pour concrete over them. Ensure that your framework is sturdy and stable, following any local building codes or regulations.
Waterproofing:
Waterproofing is crucial to prevent water damage and mould or mildew growth. You can use a product like Red-Guard or AquaDefense to coat the floor, walls, and curb, which acts as both a waterproofing agent and an uncoupling agent to prevent tile cracks and leaks.
Alternatively, you can use a waterproof foam shower tray or a bonded waterproofing membrane (A118.10) on the walls and shower pan. The Schluter Kerdi Shower System and the Wedi Shower System are popular choices for a sealed shower system.
Install the Drain:
Before installing the drain, apply a waterproofing product like Tank-10 around it and to the rest of the shower base. Ensure you follow the manufacturer's instructions for proper installation of the drain.
Tile Installation:
After waterproofing and installing the drain, you can proceed with tile installation. Lay your floor tiles, creating a slight slope towards the drain to ensure proper water runoff. Back butter the tiles around the perimeter to facilitate the slope.
Finishing Touches:
Once the tiles are in place, caulk all the joints and screw holes with latex caulk. Latex caulk is essential as it allows the waterproofing material to adhere properly. Finally, install any necessary shower fixtures, such as the showerhead, handles, and doors or curtains, to complete your shower without a pan.
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Using a shower screen
While it is possible to build a shower without a pan, using a shower screen, it is important to ensure that the shower remains watertight. Here are some things to consider when using a shower screen:
Firstly, if you have a concrete floor, you can build a concrete curb to keep the water in. This option may defeat the purpose of having a wet room, so an alternative is to install a shower screen. A shower screen is a product that can pivot inside the shower opening, providing a design for a walk-in space. This allows for easy entry and exit without the need for a shower pan or curb.
Another option for a curbless shower is to use a one-level wet room design. This type of shower has no threshold or curb, making it safer and more accessible, especially for those with limited mobility. The floor of the shower is typically tiled or made with a durable acrylic pan with a linear drain. This design also offers flexibility, as you can easily change the size or shape of the shower without being restricted by a shower pan or glass enclosure.
When creating a one-level wet room, it is important to consider the flooring. Large format tiles or sleek grout-free shower panels can be used to create a modern, minimalist look. The shower should also have a linear drain to ensure proper water drainage.
To ensure that your shower is watertight, you may need to install a shower liner. This involves measuring and cutting the liner to fit the shower walls and floor, creating a continuous piece that covers the entire shower area. The liner should be installed over a cured mortar surface to protect it from abrasion and potential leaks.
Additionally, when building a shower without a pan, it is crucial to consider the subfloor. The subfloor should be flat and level, and if necessary, a self-levelling compound can be applied to create an even surface. This compound should adhere to the substrate, such as OSB, cement board, or plywood.
In summary, when using a shower screen in a shower without a pan, consider the flooring, drainage, and water tightness. You may need to install a curb, a liner, or opt for a one-level wet room design to ensure proper water management and accessibility.
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Creating a slope for tiles
Step 1: Plan the Layout
Before you begin, decide on the layout of your shower, including the location of the drain and the type of tiles you will use. Smaller tiles, such as 2x2 or 3x3, are generally recommended for shower floors as they are easier to slope and require less cutting. Larger tiles can be used, but they may need to be cut to create a proper slope and avoid improper drainage.
Step 2: Prepare the Subfloor
Cut the subfloor and install a "shower base former" or a "shower mud pan" onto your existing joists. This provides a solid base for your shower and eliminates the need to cut into your joists, maintaining the structural integrity of your framing.
Step 3: Install the Drain
Choose a suitable drain type, such as a linear drain or a centre drain, considering the slope direction and complexity. Install the drain according to the manufacturer's instructions.
Step 4: Waterproofing
Apply a waterproofing layer to the shower base and walls. This is crucial to prevent moisture from leaking into the wall framing. Products like Tank-10 or waterproofing tape can be used, along with waterproofing membranes and fabric such as Kerdi or PVC vinyl.
Step 5: Create the Slope
Use a mortar bed or "mud bed" to create the slope. This layer should be made with the appropriate concrete mix and properly sloped to ensure water sheds and absorbed moisture can evaporate. The slope should direct water towards the drain.
Step 6: Tile Installation
Finally, install your tiles, ensuring they are level and follow the slope towards the drain. You may need to back butter the tiles around the perimeter to create a smooth transition and maintain the slope.
Remember to follow local building codes and regulations, and always seek professional advice if you are unsure about any part of the process.
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Frequently asked questions
Curbless showers are more accessible for family members of all ages to use, including children and grandparents, and can even accommodate a wheelchair. They also make the bathroom feel larger and offer a sleek and modern look.
First, you need to install the shower base and drain. Then, you need to waterproof the shower, using products such as waterproofing tape and Tank-10. Finally, you can lay the floor tile, ensuring that it has a slope to allow water to drain properly.
Some products that can be used to build a curbless shower include TruDEK Classic Base, Redi Free one-piece prefabricated shower pan, and DuraPlan height-adjustable shower tray.
While it is not strictly necessary to have a shower pan, it is a good idea to include one to catch any water that leaks through the floor and redirect it to the drain.
Yes, one alternative is to use a wet room system, where the entire bathroom floor is waterproofed, so you don't have to worry about water on the floor.











































