Ella Walter
Building a shower pan without a liner is possible, but it is not recommended. The shower pan liner is essential for waterproofing, protecting the porous shower wall framing and lower floor layers from water permeation and mould. While it is possible to waterproof a shower pan with a sloped mortar bed and tile, this method is more likely to result in leaks and mould issues. To install a shower pan with a liner, you will need to prepare the subfloor, install the drain, and apply a mortar bed and tiling.
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What You'll Learn
The importance of a shower pan liner
While it is possible to build a shower pan without a liner, the liner is an important component of a shower installation.
The shower pan liner is a critical aspect of waterproofing, which is an underappreciated yet essential step in shower construction. Waterproofing is necessary to protect the porous shower wall framing and lower floor layers from water permeation and the potential outbreak of mould. The liner acts as a backup in case of leaks, catching water that seeps through the tile and directing it towards the drain, thus preventing mould and other issues.
Shower pan liners are flexible and made of polyvinyl chloride (PVC) or chlorinated polyethylene (CPE). They conform to the contours of the wood framing, bending upward at the walls and folding into corners. This flexibility allows them to effectively shed water into the drain. The installation process for CPE and PVC liners is similar, with the main difference being the bonding adhesive used for seaming. CPE liners are generally recommended for those with floor radiant heating systems and for first-time DIYers due to their greater flexibility compared to stiffer PVC liners.
To install a shower pan liner, one must first cut a hole in the centre of the shower floor for the drain assembly. After placing the drain base in the opening, the liner is laid and cut to fit the dimensions of the shower. It is then adhered and stapled to the wall framing and curb, with care taken to avoid blocking the drain's weep holes. Finally, a mortar bed is applied on top of the liner, followed by tiling or flooring.
In summary, the shower pan liner is an important component of a shower installation, providing essential waterproofing and backup protection against leaks. It is relatively accessible for DIYers to install, with CPE liners being a good option for beginners.
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How to install a shower pan liner
Installing a shower pan liner is a crucial step in ensuring your shower is waterproof and protected from mould. Here is a step-by-step guide on how to install a shower pan liner:
First, check that your subfloor is level. If it is not, apply a self-levelling compound following the manufacturer's instructions. Ensure that the compound adheres to the substrate and run it up to the reference line drawn on the subfloor. Allow the compound to cure.
Next, test-fit the shower drain flange, also known as the "drain basket" or "drain body," to ensure a flush fit with the shower base. Place your drain base into a pre-made hole, typically between 4.5 inches and 5 inches in diameter, and screw the flange to the subfloor. If your drain is pre-assembled, loosen the bolts connecting the clamping ring to the flange and remove the ring, leaving the drain plug in place. If you don't have a drain plug, use duct tape to cover the drain hole temporarily.
Now, you can prepare the slope. You have two options: using mortar or installing a product like Oatey's Perfect Slope. If you choose to use mortar, create a sloped mortar bed to drain weep holes and waterproof the sloped floor using hot asphalt or a vinyl pan liner. Ensure the liner extends over the curb and up surrounding walls at least 2 inches above the curb. If you opt for Oatey's Perfect Slope, trim it to your shower dimensions and around the drain for a flush fit. Place it flat with the printed side up without using adhesives.
After preparing the slope, apply a mortar base on top of the pan liner and proceed with thinset application, which is the adhesive between the mortar and tile. Finally, choose your tiling and apply it according to the manufacturer's instructions.
Remember, the shower pan liner is critical for waterproofing, so ensure all steps are carefully followed to prevent leaks and mould issues.
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Waterproofing your shower pan
There are several methods and products available for waterproofing your shower pan, each with its own set of advantages and disadvantages. Here is a step-by-step guide to help you through the process:
Step 1: Prepare the Subfloor
Start by ensuring that your subfloor is flat and level. If it is not, apply a self-levelling compound following the manufacturer's instructions. Make sure to use a compound that adheres to the substrate you are working with (OSB, cement board, plywood, etc.). Allow the compound to cure completely before proceeding to the next step.
Step 2: Install the Drain
Place your drain base into a pre-made hole. A 4-1/2 inch hole is typically recommended for tile shower drains. Screw the flange to the subfloor, ensuring that the drain pieces fit flush with the shower base. If your drain is pre-assembled, loosen the bolts connecting the clamping ring to the flange and remove the ring, keeping the drain plug in place. Cover the drain hole with duct tape if you don't have a drain plug.
Step 3: Create the Slope
You have two options for creating the slope: using mortar or a pre-made slope product like Oatey's Perfect Slope. If you choose to use mortar, create a sloped mortar bed using the "dry pack" method, ensuring it drains to weep holes. If you opt for a pre-made slope product, trim it to your shower dimensions and install it according to the manufacturer's instructions.
Step 4: Install the Shower Pan Liner
Measure the length and width of the curb and cut a piece of the liner to those measurements. Staple this piece over the top and exposed sides of the curb. Install the liner according to the manufacturer's instructions, ensuring it extends over the curb and up the surrounding walls by at least 2 inches. Oatey's shower pan liner kits come with a liner and corner dams for left or right corner installations.
Step 5: Apply the Final Mortar Bed and Tiling
Once your liner is installed, apply a mortar base on top of it. Then, apply thinset, which is the adhesive between the mortar and tile. Choose your tiling and proceed with the application, following the manufacturer's instructions.
Alternative Waterproofing Methods
While the shower pan liner is the most common method for waterproofing, there are alternative systems available, such as Kerdi, Hydroban, and Wedi. These systems offer different advantages and disadvantages. For example, Kerdi and Hydroban are sheet membrane products that are easy to install, flexible, and robust. Liquid membranes like Redgard or Hydroban require a certain thickness and multiple coats, taking longer to dry. Additionally, the Wedi system provides a complete solution, including boards for walls, preformed shower trays, caulking, fasteners, and more. However, it may be more expensive and challenging to find.
Regardless of the method or product you choose, always ensure to follow the manufacturer's instructions and take the necessary precautions to achieve a successful and waterproof shower installation.
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Using a pre-made shower pan
Step 1: Floor Prep
Before installing the pre-made shower pan, ensure that the subfloor is completely flat and level. If it's not, apply a self-levelling compound following the manufacturer's instructions. Make sure the compound adheres to the substrate, such as OSB, cement board, or plywood. Allow the compound to cure completely before proceeding.
Step 2: Dry-Fit the Shower Pan
Place the pre-made shower pan in the opening and trace a line onto the subfloor along its edge. This line will be important for reference later on. Check if the shower drain hole aligns with the existing shower drain. If not, you may need to relocate the drain pipe or make adjustments.
Step 3: Drill Holes and Assemble Drain
Drill holes in the flange at each stud location. These holes will be used to secure the shower pan to the wall studs. Assemble the compression shower drain according to the manufacturer's instructions. Make sure the drain assembly is compatible with your pre-made shower pan.
Step 4: Secure the Shower Pan
Apply adhesive or small mounds of mortar within the area where the shower pan will sit, following the manufacturer's instructions. Place the flange through the top side of the shower pan and press down firmly without twisting. Wipe away any excess adhesive or caulk before it dries. Secure the shower pan rim to the wall studs using exterior-grade screws through the pre-drilled holes.
Step 5: Install the Drain Components
Line the underside of the shower drain flange with latex/acrylic or silicone caulk, following the manufacturer's instructions. Place the rubber washer and friction washer onto the threads of the flange, then screw on the locking ring to tighten the gasket and washers in place. Install the rubber drainpipe gasket, gasket setscrew, and shower drain screen according to the manufacturer's instructions.
Step 6: Test for Leaks
Allow the adhesive or mortar to dry completely before testing for leaks. Check the connection between the shower pan and shower drain for any signs of leakage. Also, inspect the shower stall and surrounding areas for potential leaks. If necessary, get a professional inspection to ensure there are no issues.
Step 7: Install Shower Walls
Once you've confirmed that there are no leaks, you can move on to installing the shower walls and tiling the shower. Follow the manufacturer's instructions for the specific materials and products you are using.
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Alternative materials for shower pans
A shower pan is an essential component of a shower, serving vital functions. While there are many off-the-shelf options available, you may want to consider alternative materials for your shower pan to better suit your needs and preferences. Here are some options for alternative materials for shower pans:
- Tileable Shower Base: These usually come with chrome drains and are made of fiberglass and/or composite plastic materials. They are designed for easy installation, with the drain meant to connect easily to plumbing. While they typically start at a higher price point, at around $500, they offer convenience and customisation options.
- Tile over Concrete: This traditional method involves installing tiles over concrete. It provides total control over the customisation of the shower in terms of appearance, size and shape. However, neither tile nor grout is typically waterproof, so additional steps are necessary to ensure waterproofing.
- Cultured Marble: Cultured marble is a manufactured composite material that blends the strength of stone with modern science. It can be a challenging material to work with, requiring specialised tools and multiple people to install. However, when properly installed, it can last a lifetime and offers a unique and elegant look.
- Sheet Metal: Sheet metal shower pans, such as those made of copper, offer a highly durable and low-maintenance option. They have inherent antibacterial properties and provide a unique look and feel to your shower.
- Moulded Stone: Moulded stone shower pans are made from a combination of natural stone and synthetic plastic, resulting in a durable and luxurious appearance. They are generally easy to maintain, resistant to mould and mildew, and do not require grout, which can be a common issue with other materials.
- Ready-made Shower Pans: If you want a quick and convenient option, you can choose from various ready-made shower pans available in the market. These come in different sizes and styles, and they can make the installation process much easier.
Remember, when considering alternative materials for your shower pan, it is essential to keep in mind factors such as waterproofing, maintenance, durability, and cost. Additionally, some materials may require specialised installation, so be sure to consult with professionals to ensure a proper and safe installation.
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Frequently asked questions
No, it is not recommended to build a shower pan without a liner. The liner is an important aspect of waterproofing your shower and protecting the porous shower wall framing and lower floor layers from water permeation and mould.
A shower pan liner acts as a waterproof barrier, catching water that gets through the tile and preventing mould and leaks.
Shower pan liners are typically made of PVC or vinyl, with some made of CPE if your floor has a radiant heat system.
First, ensure your shower bed is watertight. Then, install a drain and drain height. Apply a mortar base on top of the pan liner, followed by thinset application and tiling.
A pre-made shower pan can be used, made of plastic or concrete. Another method involves a ""hot mop" of waterproof rubberized material professionally installed.
