Emilie Meyer
A shower pan is a custom-built, waterproof floor for a shower, usually finished with tiles. While you can buy a prefabricated shower pan, making your own has its advantages. You can save money, customise the size and shape, and create a one-of-a-kind tile shower. However, it is a time-consuming process that requires intermediate DIY skills to ensure proper installation and avoid leaks and water damage. This article will discuss the steps and considerations for building your own shower pan.
Characteristics and Values
| Characteristics | Values |
|---|---|
| Cost | Building your own shower pan can save you money on labour costs and the cost of a pre-made shower pan. |
| Customisation | Making your own shower pan allows you to customise the size, shape, and design to fit your specific needs and space. |
| Materials | Plywood, fibreglass mats, epoxy, silicone, resin, cement, tiles, and waterproofing liners are commonly used materials for a DIY shower pan. |
| Installation | DIY shower pans require careful installation to prevent leaks and water damage. It is recommended to seek professional help if the project is above your skill level. |
| Time | Constructing a shower pan can take several days, including tile work and curing time for materials like fibreglass. |
| Tools | Basic tools like a jigsaw, blade, holesaw, trowel, duct tape, and a mixing tray are required for the installation process. |
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What You'll Learn
Using fibreglass mats and epoxy
Building your own shower pan can help you save money and ensure a perfect fit for your space. Before you begin, it's important to note that shower pans need to be installed correctly to avoid leaks and water damage. If you're unsure about any part of the process, it's best to consult a professional.
Now, let's dive into the process of using fibreglass mats and epoxy to create a custom shower pan. First, you'll need to create a mould for your shower pan. This can be done by cutting plywood into two pieces with the dimensions of your desired shower stall. These pieces will form the base of your shower pan. Place drains in opposite corners of the plywood to ensure proper drainage. Cut holes in the plywood for the drains, with the holes in the first sheet larger than the outer diameter of the drain and the holes in the second sheet fitting the outlet of the drain. Glue the sheets together, forming a recess for the drains.
Next, cut 2x4 lumber to build a frame on top of the plywood, creating the rim of your shower pan. At this stage, you can also cut out holes for the drains using a jigsaw with a metal blade. Apply butyl tape or silicone to the underside of the drains before inserting them into the holes. Now, you're ready to start working with the fibreglass mats and epoxy.
Start by laying stranded fibreglass mats over the pan, cutting them to fit the width of the inner rim. You'll need at least two layers of mats, with one layer sitting on top of the other. Ensure that the mats touch at the corners, but don't worry if they're not perfectly snug. Make pizza-like cuts in the mats for the drain holes, allowing the fibreglass to form into the drain moulds. When you're ready to apply the epoxy resin, work in a well-ventilated area to avoid inhaling fumes.
Mix the epoxy resin and hardener according to the manufacturer's instructions, using the correct ratio and measurement cups with ratio markings. You have about 45 minutes to work with the mixture, so divide it into smaller batches if needed. Start by adding the epoxy to your cup, then add the hardener. Mix thoroughly for a minute before pouring it onto the fibreglass mats. Use a spatula to spread the mixture, being careful not to move the fibreglass. Scrape the resin upwards when you reach the sidewalls, ensuring there are no air bubbles between the wood and the mat.
Let the first layer cure, and then sand down any bumps. Add a second layer of fibreglass webbing, paying extra attention to the corners to avoid trapping air bubbles. Finally, give the pan a coat of paint and let it dry. Mix one more batch of resin and apply a final coat to seal the drains and ensure a smooth finish. Place plastic bags under each drain to catch any excess epoxy.
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Waterproofing with a liner and sealant
Waterproofing a shower pan is essential to prevent leaks and water damage. While a shower pan provides a waterproof shower floor, improper construction can lead to leaks. To ensure effective waterproofing, a combination of a liner and sealant is often used.
Liner Options:
- Rubber Liner: A rubber liner can be installed between the mortar pre-slope and the tile in a tiled shower pan. This liner can also be built directly onto a wooden sloped platform.
- Styrofoam Pan: A pre-made styrofoam pan, such as those offered by Schluter and Wedi, can be cut to fit your desired size and already has the slope built-in.
- Fabric Membrane: A fabric membrane system can be used as an alternative to a liquid system. It provides a topical waterproof layer.
Sealant Options:
- SEMCO Liquid Membrane Sealant: This innovative product offers superior waterproofing capabilities and protects your shower area from water damage. It also reduces the risk of mold and mildew growth. Before applying the SEMCO Liquid Membrane, ensure that the surface is thoroughly cleaned and repaired, removing any dirt, oils, or mold. Mix the sealant thoroughly before application, using a drill with a mixing paddle attachment at a low speed. Apply two coats of the sealant, allowing adequate drying time between coats. The final coat should be allowed to cure fully, which can take 5 to 7 days, depending on temperature and humidity levels.
- Liquid Rubber Foundation Sealant: This easy-to-install sealant can be applied using a microfiber roller or a brush for edges and corners. It requires 3 to 4 heavy coats, with each coat applied at a right angle to the previous one. Allow 6 to 8 hours of dry time between coats, and ensure proper ventilation during the curing process.
By selecting the appropriate liner and sealant combination, you can effectively waterproof your shower pan, ensuring a durable and leak-free showering experience.
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Using plywood to frame the shower pan
Building a shower pan using plywood is a great way to create a custom-sized, waterproof pan for your shower. This method can save you thousands of dollars in labour costs and will ensure you have a one-of-a-kind shower.
To begin, you will need to cut the plywood into two pieces with the dimensions of your shower stall. It is important to ensure that your plywood floor is stable, free of rot or damage, and properly installed. You will then need to install blocking between the studs to create the shower pan "box". Use framing pieces or sheathing material as blocking. Stack 2 x 4s to create a curb frame and add stucco wire or galvanized wire mesh to reinforce the mud mortar. You can use scraps of leftover plywood for this.
The next step is to install the drain assembly. Measure and mark the drain's location on the floor, keeping in mind the desired shower size and accessibility. Cut a hole in the plywood floor according to the drain specifications and install the drain base using the manufacturer's instructions.
Now, you will need to waterproof the shower pan. Measure and cut a waterproofing membrane to size, leaving extra material to cover the walls. Apply a layer of thin-set mortar onto the plywood floor within the membrane's boundaries. Cut and attach cement boards to fit the shower pan area, screwing them into the plywood floor and ensuring they are level. Apply a final layer of thin-set mortar over the cement board and allow it to cure for 24-48 hours.
Finally, you can tile the shower pan. Apply tile adhesive to the cured mortar bed and install your chosen tiles, following the manufacturer's instructions. Allow them to set and dry.
It is important to note that improperly constructed shower pans can leak water, so it is crucial to ensure proper preparation and waterproofing.
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Using cement and mortar
Building a shower pan can be a challenging task, but it can be done with the right tools and knowledge. Here is a step-by-step guide on how to build a shower pan using cement and mortar:
Prepare the Subfloor and Drain Plumbing
Before beginning any work on the shower pan itself, it is crucial to ensure that the subfloor is flat, solid, and sturdy enough to support the weight of the shower pan. Additionally, the drain base should be properly installed.
Frame the Shower Pan
The shower pan should be framed using plywood. The recommended size is 2 by 6 inches (5.1 cm x 15.2 cm) boards, but this may vary depending on the specific requirements of your shower.
Install a Vapour Barrier
Cover the entire area of the shower pan with a layer of a vapour barrier. This will help prevent moisture from seeping into the wood structure of your home. Secure the vapour barrier in place using a staple gun.
Add a Layer of Metal Lath
Install a layer of metal lath over the vapour barrier. This layer should cover the entire surface area of the shower pan. Nail the metal lath in place to secure it.
Install the Drain
Glue the shower drain to the pipe that is already installed. Ensure that it is level and secure. Tape off the drain opening with duct tape or cover it with a cloth to prevent mortar from getting inside during the installation process.
Mix and Apply the First Layer of Mortar
Prepare a mixture of mortar and sand, using a ratio of 1:4 or 4-5:1, depending on the type of mortar used. Add water to the mixture, being careful not to make it too wet, as this will weaken the mortar. Spread and smooth out the first layer of mortar, ensuring it slopes towards the drain.
Install a Waterproofing Liner
Once the first layer of mortar has set, install a waterproofing liner, such as a PVC liner, over it. Cut the liner to size, making it 2-3 inches taller than the framing. Seal the liner to the shower drain using an appropriate sealant.
Apply a Second Layer of Mortar
After the waterproofing liner has been installed, apply a second layer of mortar. Embed a cement board into this layer, ensuring that it is gapped above the shower liner by at least 1/2 inch.
Install Tile Backer Board and Wire Mesh (Optional)
If you plan to install tiles, add a layer of tile backer board and wire mesh over the second layer of mortar. Secure the backer board with screws, and ensure good contact with the wall studs.
Finalize the Shower Pan
Once all the layers have been installed and set, remove the tape or cloth from the drain. Allow the mortar to cure completely before using the shower.
It is important to note that this is a general guide, and specific products and methods may vary. Always consult local building codes and relevant handbooks, such as the Tile Council of North America (TCNA) Handbook, for detailed information before starting any construction project.
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Using a pre-made styrofoam pan
Styrofoam or foam shower pans are a great option for a DIY shower pan. They are lightweight, easy to install, and provide a solid and waterproof foundation for tile or stone shower floors. Here are the steps for using a pre-made styrofoam pan:
Step 1: Choose the Right Foam Shower Pan
Foam shower pans come in various shapes and sizes, including rectangular, square, and neo-angle designs. Make sure to select a pan that fits your shower configuration and drain location. You may need to trim or cut the pan to fit specific dimensions or create custom slopes.
Step 2: Prepare the Subfloor
Before installing the foam shower pan, ensure that your subfloor is clean, level, and dry. Follow the manufacturer's instructions for any specific requirements or preparations.
Step 3: Install the Foam Shower Pan
Place the foam shower pan over the subfloor, ensuring it is properly sloped towards the drain. Check the manufacturer's instructions for any specific guidelines or requirements for installation.
Step 4: Waterproof the Foam Shower Pan
Foam shower pans are not inherently waterproof, so you will need to add a waterproofing layer. You can use a liquid membrane or a sheet membrane to provide a watertight seal. Follow the manufacturer's instructions for proper application and curing times.
Step 5: Install Tile or Stone Surface
Finally, you can install your chosen tile or stone surface on top of the foam shower pan and waterproofing membrane. Ensure you follow the manufacturer's instructions and consult with professionals to ensure your installation adheres to local building codes and regulations.
Using a pre-made styrofoam shower pan offers a quicker and easier installation process compared to traditional mortar bed installations. It provides a lightweight, durable, and waterproof foundation for your shower floor while also helping to maintain water temperature with its insulating properties.
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Frequently asked questions
Making your own shower pan allows you to customize the size and shape to fit your needs. It is also much cheaper than buying a pre-made one, which can cost upwards of CA$189.
You will need plywood, stranded fibreglass mats, epoxy, butyl tape or silicone, paint, resin, and tiles. You will also need a 2-part drain with an upper and lower flange, duct tape, a mixing tray, quick-set mortar, and water.
First, cut the plywood to the dimensions of your shower stall. Then, lay the fibreglass mats over the pan and cut them to size, making pizza-like cuts for the drain holes. Apply tape to the drain opening to protect it and mix your mortar in the mixing tray with water. Spread the mortar over the fibreglass mats, creating a border and smoothing it out so it slopes toward the drain. Once the first layer of mortar is set, add a waterproofing liner and another layer of mortar before laying your tiles.
Yes, improper construction of a shower pan can lead to leaks and water damage. Ensure that you have intermediate DIY skills and carefully follow the instructions provided. If the project is above your skill level, it is recommended to hire a professional.
