Cody Casey
Building a concrete shower pan over a wood subfloor is a complex process that requires careful planning and execution to ensure a functional, durable, and visually appealing shower. A shower pan is the sloped base of a walk-in shower that forms the shower floor, and it is crucial to have a solid subfloor and properly installed drain base before beginning construction. The process involves preparing the subfloor, installing a pre-slope, adding a liner, creating a mud bed, and finishing with a tile surface. Proper waterproofing is essential to prevent water permeation and mold outbreaks. While it is possible to build a concrete shower pan over a wood subfloor, it is important to follow the necessary steps and guidelines for a successful installation.
| Characteristics | Values |
|---|---|
| Materials | Concrete, cement, plywood, tile, mortar, waterproofing membrane, galvanized wire mesh, stucco wire, screws, adhesive, gravel, tile spacers, plastic sheet |
| Steps | Clear and prepare the subfloor, install drain base, apply waterproofing membrane, attach cement board, apply thin-set mortar, tile the shower pan, install pre-slope, install liner, install mud bed and curb, install water barrier, pour concrete |
| Tips | Ensure proper preparation and waterproofing, create a solid foundation, use self-leveling compound if subfloor is uneven, slope the floor to ensure water is directed to the drain, cover the drain hole if no drain plug is available, use Oatey's Perfect Slope for ease of installation |
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What You'll Learn
Prepare the subfloor
Preparing the subfloor is a crucial step in ensuring the durability and functionality of your shower pan. Here are the detailed steps to prepare the subfloor for a concrete shower pan installation over a wood subfloor:
First, clear the area by removing any debris, old tiles, or flooring materials from the plywood floor. Check the condition of the wood subfloor to ensure it is stable, free of rot or damage, and strong enough to support the weight of the concrete shower pan. Make sure to consult your local building code and relevant guidelines, such as the Tile Council of North America (TCNA) Handbook and ANSI108.1, for specific requirements and recommendations.
Next, mark the location of the drain by measuring and indicating its position on the wood subfloor, considering the desired shower size and accessibility. Use a utility knife to cut a hole in the plywood floor according to the drain specifications. Install the drain base by following the manufacturer's instructions, placing it over the hole, and screwing it securely onto the wood subfloor.
Apply a waterproofing membrane over the plywood floor to ensure a completely watertight shower pan. Measure and cut the membrane to size, leaving extra material to cover the walls. Spread a layer of thin-set mortar onto the plywood floor within the boundaries of the membrane using a notched trowel.
To create a curb for your shower pan, stack and fasten 2x4s sequentially to the subfloor. Screw the bottom 2x4 to the subfloor and then attach the second 2x4 to the fastened first 2x4, repeating this process to achieve the desired curb height. You can then attach metal mesh or stucco wire to the lumber curb to help hold the mortar, which will be applied with the first mortar layer.
Finally, check the levelness of the subfloor to ensure it is completely flat and level. If the subfloor is not level, apply a self-leveling compound, following the manufacturer's instructions, to create an even surface. Allow the compound to cure, and then test-fit the shower drain flange to ensure it fits flush with the shower base.
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Install a pre-slope
Installing a pre-slope is an important step in building a concrete shower pan over a wood subfloor. It ensures that water drains properly and prevents pooling, protecting the shower from water damage. Here is a step-by-step guide to installing a pre-slope:
First, ensure that your subfloor is level. If it is not, apply a self-leveling compound following the manufacturer's instructions. Make sure the compound adheres to the substrate, such as plywood. Use a level to check that the surface is even and level from left to right and front to back.
Next, mark the location of the drain on the subfloor, considering the desired shower size and accessibility. Cut a hole in the subfloor for the shower drain pipe using a utility knife or a jigsaw/circular saw. The hole size typically shouldn't exceed 5 inches, but always check with the manufacturer's specifications.
Then, install the drain base by placing it over the hole and screwing it down securely. You may need to adjust the P-trap and waste pipe to ensure they align with the manufacturer's instructions.
After installing the drain, apply a waterproofing membrane over the subfloor and up the walls. Measure and cut the membrane to size, then spread a layer of thin-set mortar onto the subfloor within the membrane's boundaries.
Now you're ready to create the pre-slope. Mix mortar and sand to create a pre-slope mortar mix. A common ratio is 1 part mortar to 3 parts sand mix, but you may need to adjust this based on your specific product and conditions. Use this mix to build a gentle slope towards the drain, ensuring that the slope is higher at the edges and lower towards the drain. Pack the mix down and use a straight edge to confirm that you have a smooth slope in all directions.
Finally, once the pre-slope is complete, you can continue with the rest of the shower pan installation, including installing a cement board, applying a final layer of thin-set mortar, and tiling the shower pan. Remember to follow the manufacturer's instructions for curing and drying times.
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Install a drain base
Installing a drain base for a concrete shower pan over a wood subfloor requires careful preparation and waterproofing to ensure a functional and durable shower. Here is a step-by-step guide to installing the drain base:
- Clear and Prepare the Subfloor Area: Start by removing any debris, old tiles, or flooring materials from the plywood subfloor. Check the condition of the plywood to ensure it is stable, free of rot or damage, and ready for installation.
- Mark the Drain Location: Measure and mark the desired location of the drain on the subfloor, considering the planned shower size and accessibility. This mark will serve as a reference point for the drain installation.
- Cut a Hole for the Drain: Using a utility knife or a jigsaw/circular saw, carefully cut a hole in the plywood subfloor according to the drain specifications. This hole should not exceed 5 inches in diameter, but always refer to the shower pan manufacturer's instructions for exact dimensions.
- Install the Drain Base: Following the manufacturer's instructions, place the drain base over the cut hole and securely screw it down onto the plywood subfloor. This step is crucial for a watertight shower pan.
- Waterproofing: Apply a waterproofing membrane over the plywood subfloor and the installed drain base. Measure and cut the membrane to size, allowing for extra material to cover the walls. This step ensures that any water is directed towards the drain and prevents mould and tile failure.
- Apply Thin-Set Mortar: Using a notched trowel, spread a layer of thin-set mortar onto the plywood subfloor within the boundaries of the waterproofing membrane. This will create a strong bond for the next steps.
- Install a Cement Board: Measure and cut a cement board to fit the shower pan area. Secure it to the plywood subfloor using cement screws, ensuring proper spacing and levelness. This provides a sturdy base for tiling.
- Final Layer of Thin-Set: Apply a thin layer of thin-set mortar over the cement board surface using a margin trowel. Allow the mortar to cure for 24-48 hours, following the manufacturer's instructions.
- Prepare for Tiling: Once the mortar has cured, apply tile adhesive and install your chosen tiles, following the manufacturer's guidelines. Allow the tiles to set and dry before use.
- Install the Shower Drain Pipe: Relocate the P-trap for the shower drain pipe so that the waste pipe extends approximately 1 3/4 inches above the subfloor, as specified in the manufacturer's instructions. Ensure the shower drain hole aligns with the existing shower drain.
- Adjustable Drain and Final Touches: Set the adjustable drain at the calculated low point and raise it by approximately 1/8" to accommodate tile installation. Place a layer of clean gravel or crushed tile around the shower drain to keep the weep holes free.
By carefully following these steps and allowing adequate curing and drying time, you can ensure a properly installed drain base for your concrete shower pan over a wood subfloor.
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$199.5 $210
Install a liner
Installing a shower pan liner is an essential step in ensuring your shower is watertight and preventing water damage and mould. Here is a step-by-step guide to installing a liner:
Prepare the Subfloor:
Start by clearing the subfloor of any debris, old tiles, or flooring materials. Check the condition of the subfloor to ensure it is stable and free of rot or damage. The entire bottom of the shower pan needs to sit on a flat, level surface. Check the subfloor area from left to right and front to back to ensure it is level. If the subfloor is not level, apply a self-leveling compound following the manufacturer's instructions.
Mark Drain Location and Cut Hole:
Measure and mark the drain's location on the subfloor, considering the desired shower size and accessibility. Use a utility knife or a jigsaw to cut a hole in the subfloor for the shower drain pipe, typically no larger than 5 inches.
Install Drain Base:
Place the drain base into the hole and screw it down onto the subfloor. Follow the manufacturer's instructions to ensure a secure fit.
Apply Waterproofing Membrane:
Measure and cut a waterproofing membrane to fit the shower base. Apply a layer of thin-set mortar using a notched trowel within the membrane's boundaries. This step is crucial to ensuring a watertight shower pan.
Install Shower Pan Liner:
Lay the shower pan liner on a flat surface and measure the length and width of the mortar bed. Cut the liner according to your markings. Drape the liner over the mortar bed and drain base, ensuring it is centred. Cut X-shapes over the bolts that the clamping ring screws into.
Secure the Liner:
Use a staple gun or hammer and nails to secure the liner in place. Ensure that the liner is smooth and free of wrinkles before securing it.
Test for Leaks:
Once the liner is installed, test the shower pan and drain connection for leaks. Get an inspection if needed, and ensure there are no leaks before moving on to installing the shower walls.
It is important to follow the manufacturer's instructions for any products used and to consult local building codes and guidelines for additional requirements or recommendations.
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Install a mud bed
When installing a mud bed for a shower pan on a wood subfloor, there are several important steps to follow. Firstly, ensure that the subfloor is stable, free of rot or damage, and completely flat and level. If the subfloor is not level, apply a self-leveling compound following the manufacturer's instructions, ensuring it adheres to the substrate.
Next, mark the location of the drain by measuring and keeping in mind the desired shower size. Cut a hole in the subfloor for the drain pipe, typically no larger than 5 inches, using a utility knife or a jigsaw/circular saw. Install the drain base by placing it over the hole and screwing it down, then apply a waterproofing membrane over the subfloor to ensure a watertight shower pan. Measure and cut the membrane, leaving extra to cover the walls, and apply a layer of thin-set mortar using a notched trowel.
After the waterproofing membrane is in place, cut and attach cement board to fit the shower pan area, securing it to the subfloor with cement screws. Check that the cement board is level using a level tool, then apply a final layer of thin-set mortar with a margin trowel to create a strong bond with the tiles. Allow the mortar to cure according to the manufacturer's instructions, which is typically 24-48 hours.
Now, you can begin to install the mud bed. Using bagged sand mix or a mix of 4 parts sand to 1 part Portland cement, create a batch of dry deck mud with a latex additive, mixing it in a wheelbarrow. Spread the mortar onto the floor, sloping it from the top of the guides or the bottom wall plate to the top of the drain flange. Compact the mortar into an even surface and let it dry overnight.
Finally, roll out the membrane on the surrounding floor, marking cut lines that are larger than the shower floor to cover all faces of the curb. If the shower stall is larger than the membrane, solvent-weld additional sections. Tape off the drain opening to keep it clean, and place a layer of clean gravel or crushed tile around the drain to keep the weep holes free.
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