How to Build a Mortar Shower Pan on a Concrete Slab
A mortar shower pan is a durable and affordable option for your bathroom renovation. It's a classic method that offers a long-lasting and watertight solution. Building one directly on a concrete slab can be a rewarding DIY project, but it requires precision and attention to detail. Here's a comprehensive guide to help you build a mortar shower pan:
1. Preparing the Concrete Slab
a. Clean the Surface: Thoroughly clean the concrete slab, removing any dirt, debris, loose mortar, and existing sealant. Use a wire brush and a shop vacuum to ensure a clean surface.
b. Level the Surface: Use a level and a straight edge to check for any unevenness. If necessary, use a self-leveling concrete compound to create a smooth and level surface.
c. Apply a Waterproofing Membrane: Apply a liquid membrane or sheet membrane to the concrete slab to prevent water damage and ensure a watertight pan.
2. Creating the Shower Pan Base
a. Install the Drain: Choose a drain that meets your requirements, and install it in the center of the pan. Ensure the drain is level and secure, as it will be the foundation of the pan.
b. Construct the Slope: Create a slope of at least ¼ inch per foot toward the drain. You can achieve this with mortar or with pre-sloped foam boards.
c. Install Mortar Bedding: After the slope is set, build up the mortar bedding around the drain using a mortar mix specifically designed for shower pans. Ensure the bedding is even and level.
3. Installing the Mortar Pan
a. Mixing the Mortar: Follow the manufacturer's instructions for mixing the mortar. It should be the consistency of peanut butter.
b. Applying the Mortar: Apply the mortar in layers, starting from the center and working outwards. Use a trowel to smooth out the mortar and create a consistent slope.
c. Leveling and Finishing: Use a level to ensure the mortar pan is level, and use a trowel to create a smooth and even surface.
4. Curing and Finishing
a. Curing the Mortar: Cover the pan with a plastic sheet to help maintain moisture and ensure proper curing. Allow the mortar to cure for at least 24 hours.
b. Applying the Waterproofing Membrane: Once the mortar is cured, apply a second layer of waterproofing membrane over the entire pan.
c. Installing the Tile: After the waterproofing membrane is cured, you can install your chosen tile over the mortar pan.
5. Tips for Success
- Use the Right Mortar: Choose a mortar specifically designed for shower pans. It's essential for ensuring the pan's integrity and durability.
- Proper Slope: Ensure the pan has a consistent slope towards the drain to prevent water from pooling.
- Waterproof Membrane: Apply two layers of waterproofing membrane for maximum protection.
- Professional Installation: Consider hiring a professional for complex or large-scale shower pan installations.
Conclusion
Building a mortar shower pan is a rewarding DIY project that can enhance the beauty and durability of your bathroom. By following these steps and tips, you can create a long-lasting and watertight shower pan that will stand the test of time. Remember, safety is paramount. Always wear protective gear and follow safety protocols when working with tools and building materials.
