How to Build a Shower Pan for Tile on a Wood Floor
Building a shower pan directly on a wood floor is a unique challenge but achievable with the right approach. This guide will walk you through the steps of creating a sturdy and watertight shower pan, ensuring a beautiful and functional tiled shower.
1. Planning and Preparation
- Design: Before diving in, carefully plan the size and shape of your shower pan.
- Materials: You'll need:
- Plywood: ½ inch or 5/8 inch plywood for the subfloor.
- Waterproof membrane: A high-quality membrane like Schluter Kerdi, RedGard, or similar.
- Cement board: ¼ inch or ½ inch thick cement board for the pan base.
- Mortar: A thin-set mortar designed for shower pans.
- Drain: A shower drain assembly with a strainer.
- Tools:
- Circular saw
- Drill
- Level
- Tape measure
- Utility knife
- Trowel
- Grout float
2. Building the Subfloor
- Existing Floor: If you're working with a pre-existing wood floor, assess its condition. If it's uneven or weak, reinforce it with additional plywood layers or joist support.
- New Subfloor: Cut your plywood sheets to fit the shower pan's dimensions. Ensure the sheets are securely fastened to the existing floor joists with screws or nails.
- Leveling: Double-check the subfloor's level using a long level. Adjust any unevenness with shims.
3. Installing the Waterproof Membrane
- Drain Installation: Position your shower drain assembly in the center of the shower area and secure it to the subfloor.
- Membrane Application: Lay out your chosen waterproof membrane. Start from the drain, working outwards. Ensure complete coverage of the subfloor area. Use a utility knife to cut and trim the membrane neatly.
- Adhering the Membrane: Follow the manufacturer's instructions for adhering the membrane to the subfloor. Most waterproof membranes require specific adhesives or primers for proper bonding.
4. Building the Shower Pan Base
- Cement Board: Cut the cement board to match the shower pan dimensions. Leave a small overhang around the edges for tiling.
- Mortar Application: Apply a thin layer of thin-set mortar to the subfloor. Ensure it's spread evenly.
- Cement Board Placement: Carefully position the cement board over the mortar bed, ensuring it's level and flush with the drain.
- Securing: Use screws or nails to fasten the cement board to the subfloor.
5. Sealing and Finishing
- Perimeter Sealing: After the mortar has set, apply a sealant around the shower pan's perimeter. This helps to prevent water from leaking through the seams.
- Tiling: Once the sealant has dried, you can begin tiling the shower pan. Apply thin-set mortar to the back of each tile and press it firmly into place.
6. Grouting and Finishing Touches
- Grouting: After the tiles have set, apply grout between the tiles. Use a grout float to spread the grout evenly and remove any excess.
- Cleaning and Sealing: Clean the grout lines thoroughly and allow them to dry. Apply a sealant to the grout to protect it from water damage.
- Final Touches: Install any trim pieces or shower hardware.
Remember!
- Waterproofing is critical: Properly installed waterproof membrane is vital for a leak-proof shower pan.
- Follow manufacturer instructions: Pay close attention to specific product instructions regarding installation, drying times, and sealant application.
- Consult a professional: If you're unsure about any aspect of the process, seek the advice of a qualified contractor or plumber.
