How to Build a Shower Curb

To build a shower curb, start by measuring your shower space to plan the curb’s size and shape. Gather framing materials like cement board or lumber, then assemble and secure a sturdy frame on a clean, level substrate. Apply a waterproof membrane over the curb to prevent leaks, then set tiles with mortar for a finished look. Taking these steps ensures durability and water containment—keep exploring to master each stage for a professional seal and style.

Assessing Your Shower Space and Planning the Curb

Before you begin building your shower curb, you need to carefully assess your shower space to ensure the curb fits properly and functions well. Start by measuring the dimensions of your shower floor, noting any slopes or irregularities that might affect water drainage.

Check the shower entrance width and the height you want for the curb—typically, it should be around 4 to 6 inches tall to prevent water from escaping.

Consider the materials surrounding your shower, like tile or stone, so the curb blends seamlessly. Also, plan the curb’s shape—straight or angled corners—to suit your shower’s design.

Taking these steps helps you avoid costly mistakes and ensures your curb provides an effective barrier against water while complementing your bathroom’s overall look.

Gathering Materials and Tools Needed

Once you’ve planned your shower curb, gather the necessary materials and tools to ensure a smooth build. You’ll need cement board or waterproof backer board for the curb structure, a mix of mortar or thin-set for bonding, and a pre-sloped shower pan liner or waterproof membrane to protect against leaks.

Grab metal or wood framing materials if your curb requires additional support. For tools, have a trowel, level, measuring tape, utility knife, drill, screws, and a saw ready. Don’t forget safety gear like gloves and goggles.

Keeping everything on hand prevents delays and helps you work efficiently. Double-check your list before starting, so you’re fully prepared to build a sturdy, waterproof shower curb that lasts.

Preparing the Shower Floor and Substrate

A clean, level shower floor is essential for a durable curb installation. Start by removing any debris, old mortar, or loose material from the substrate.

Check the floor’s flatness using a level. If you find uneven spots, apply a thin layer of mortar or a self-leveling compound to create a smooth surface.

Ensure the substrate is fully cured and dry before proceeding. If you’re working with a plywood subfloor, consider installing a waterproof membrane or cement board to prevent moisture damage.

Properly preparing the floor and substrate sets a solid foundation, preventing future cracks or water leaks. Take your time with this step—it’ll make the curb installation much easier and longer-lasting.

Once the floor is ready, you can move on to framing the shower curb.

Measuring and Cutting the Shower Curb Frame

With the shower floor properly prepared, you can move on to measuring and cutting the frame for the shower curb. Start by determining the curb’s dimensions based on your shower’s design and floor space. Use a tape measure to mark the length and width on your framing material, typically pressure-treated lumber or concrete board. Double-check your measurements to avoid costly mistakes.

Next, use a saw appropriate for your material—like a circular saw for wood or a scoring tool for cement board—to make clean, straight cuts along your marked lines. Ensure your cuts are precise to guarantee the curb fits snugly against the shower floor and walls.

Taking your time here sets the foundation for a solid, functional curb.

Assembling and Securing the Frame

Before securing the frame, align all the pieces carefully to ensure a tight fit. Lay the cut lumber on a flat surface, double-checking that corners meet squarely. Use clamps to hold the pieces together firmly as you work.

Start by drilling pilot holes to prevent wood splitting, then fasten the pieces using galvanized screws for durability. Make sure the frame sits flush against the shower base and wall studs.

Check for any gaps or unevenness, adjusting as needed before fully tightening the screws. Once assembled, the frame should feel solid and stable.

This sturdy base will support the curb’s weight and withstand daily use, so take your time to get it right before moving on to the next step.

Applying Waterproofing Membrane to the Curb

Since the shower curb will constantly face moisture, you’ll need to apply a waterproofing membrane carefully to prevent leaks. Start by cleaning the curb surface to remove dust and debris.

Then, cut the membrane to size, ensuring it fully covers the top and sides of the curb with some overlap.

Use a paint roller or brush to apply a primer if recommended by the membrane manufacturer.

Next, firmly press the membrane onto the curb, smoothing out any wrinkles or air bubbles.

Seal all edges and corners thoroughly to create a continuous waterproof barrier.

Allow the membrane to dry completely according to the product’s instructions before moving on.

Proper application here is crucial to keep your shower dry and avoid costly water damage.

Installing the Toppings and Tile on the Curb

Once the waterproofing membrane has fully dried, you can start installing the toppings and tile on the curb. Begin by applying a thin layer of thin-set mortar evenly over the curb’s surface using a notched trowel.

Press the cement board or chosen topping material firmly onto the mortar, ensuring it’s level and secure. After the toppings set, spread thin-set mortar again and carefully place your tiles, starting at one end and working your way across.

Use spacers to maintain consistent grout lines. Press each tile firmly and tap gently with a rubber mallet to ensure adhesion.

Allow the mortar to cure for at least 24 hours before grouting. Proper installation here ensures a durable, water-resistant curb that complements your shower’s overall look.

Final Inspection and Maintenance Tips

Although the work on your shower curb might seem complete, conducting a thorough final inspection ensures everything is sealed and secure. Check all grout lines and caulking for gaps or cracks, and reapply sealant where necessary to prevent water damage.

Examine the tiles for any looseness or chips, fixing them promptly. Make sure the curb slopes slightly toward the shower to avoid water pooling.

For maintenance, regularly clean the curb with non-abrasive cleaners and inspect the grout annually. Promptly address any signs of mold or mildew to keep your shower curb in top condition.

Staying vigilant with inspections and upkeep will extend the curb’s lifespan and keep your shower leak-free.

Frequently Asked Questions

Can I Use a Pre-Made Shower Curb Instead of Building One From Scratch?

Yes, you can use a pre-made shower curb. It saves time and ensures uniformity. Just make sure it fits your shower space and is compatible with your waterproofing and tile system for a proper, leak-free installation.

How Long Does It Typically Take for the Mortar to Dry Before Tiling?

It typically takes about 24 to 48 hours for mortar to dry before you can start tiling. However, drying time depends on temperature and humidity, so make sure it’s fully cured to avoid tile issues.

What Are the Best Waterproofing Products for a Shower Curb?

You’ll want to use waterproofing membranes like Schluter Kerdi or RedGard liquid waterproofing. Both create a reliable moisture barrier, preventing leaks and mold. Make sure to apply them evenly on your shower curb for best results.

Can a Shower Curb Be Installed on a Wooden Subfloor?

Yes, you can install a shower curb on a wooden subfloor. Just make sure to reinforce the area, use proper waterproofing, and apply a cement board or backer board to prevent water damage and ensure durability.

How Do I Prevent Mold Growth Around the Shower Curb?

You prevent mold growth by sealing all joints with waterproof caulk, using a waterproof membrane under the curb, ensuring proper drainage, and ventilating the bathroom well to keep moisture from lingering around the shower curb area.

Conclusion

Now that you’ve built your shower curb, you’ve created a sturdy, waterproof barrier that keeps water where it belongs. Remember to regularly check for cracks or loose tiles to maintain its integrity. With proper care, your curb will last for years, enhancing both the function and look of your shower. Enjoy your DIY success and the confidence that comes with a well-built, professional-quality shower curb!