Liam Brooks
Replacing a bathtub with a shower often involves relocating or installing a new shower drain, which requires careful planning and execution. The process begins with removing the existing tub and assessing the plumbing layout to ensure compatibility with the new shower drain location. Typically, the shower drain is positioned lower than the surrounding floor to allow for proper water flow, necessitating the creation of a sloped base or the use of a pre-sloped shower pan. Next, the drain assembly is installed, connecting it to the existing plumbing lines while ensuring a watertight seal to prevent leaks. Finally, the area around the drain is waterproofed, and the shower floor is finished to create a functional and aesthetically pleasing space. This project demands attention to detail and adherence to local building codes to guarantee safety and durability.
| Characteristics | Values |
|---|---|
| Project Difficulty | Moderate to Difficult |
| Required Skills | Plumbing, Tile Work, Carpentry (basic to intermediate) |
| Tools Needed | Reciprocating saw, jigsaw, drill, screwdriver, wrenches, pliers, level, measuring tape, utility knife, trowel, grout float, safety gear (gloves, goggles) |
| Materials Needed | Shower drain kit, PVC pipes, fittings, cement, mortar, thinset, tiles, grout, waterproofing membrane, shower pan liner, screws, sealant |
| Time Estimate | 2-3 days (depending on experience and complexity) |
| Cost Estimate | $500 - $1500 (materials and potential professional help) |
| Key Steps | 1. Remove the bathtub 2. Prepare the subfloor 3. Install the shower pan liner 4. Install the shower drain 5. Build the shower curb (if needed) 6. Waterproof the walls and floor 7. Tile the shower area 8. Grout and seal the tiles 9. Connect plumbing to the new drain |
| Common Challenges | Ensuring proper slope for drainage, waterproofing, matching existing plumbing, tile layout and cutting |
| Permits Required | Often required for plumbing modifications (check local codes) |
| Safety Considerations | Avoid cutting into electrical wires or structural elements, use proper ventilation when working with chemicals |
| Professional Help Recommended | For complex plumbing or if unsure about any step |
| Maintenance Tips | Regularly clean the drain, inspect for leaks, and re-seal grout as needed |
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$370
What You'll Learn
Remove old tub and prep area for new drain installation
Before you begin the process of replacing your tub with a shower, it's essential to remove the old tub and prepare the area for the new drain installation. Start by turning off the water supply to the tub and removing any caulk or sealant around the edges. Use a utility knife to carefully cut through the caulk, being cautious not to damage the surrounding tiles or walls. Once the caulk is removed, use a screwdriver or pry bar to gently lift the tub away from the wall, taking care not to damage any plumbing connections or the surrounding structure.
With the tub removed, you'll need to assess the condition of the subfloor and surrounding area. Inspect the subfloor for any signs of water damage, rot, or mold, and make necessary repairs before proceeding. If the subfloor is damaged, cut out the affected area and replace it with new plywood, ensuring a sturdy and level surface for the new shower drain. Next, locate the existing drain pipe and assess its condition. If the pipe is damaged or corroded, replace it with a new PVC or ABS pipe, ensuring proper slope and alignment for efficient drainage.
Before installing the new drain, you'll need to prepare the area by creating a hole in the subfloor for the drain body. Use a hole saw or jigsaw to cut a hole in the subfloor, ensuring it's centered and aligned with the existing drain pipe. The hole should be slightly larger than the drain body to allow for proper installation and waterproofing. Once the hole is cut, test-fit the drain body to ensure a proper fit, making any necessary adjustments to the hole size or shape.
After preparing the hole for the drain body, you'll need to install a waterproof membrane or pan to prevent water from seeping into the subfloor. Apply a layer of modified thin-set mortar or waterproof membrane to the subfloor, extending it up the walls to create a watertight seal. Allow the membrane to dry completely before proceeding. Next, install a layer of cement backer board or similar material over the membrane, ensuring a smooth and level surface for the shower floor. This will provide a sturdy base for the new shower drain and help prevent water damage.
With the subfloor prepared and the waterproof membrane in place, you can now focus on installing the new shower drain. Apply a bead of silicone sealant or waterproof gasket around the edge of the drain body, then insert it into the hole in the subfloor. Secure the drain body in place using screws or bolts, ensuring a tight and watertight seal. Connect the drain pipe to the existing plumbing, using appropriate fittings and ensuring proper slope for efficient drainage. Finally, test the drain for leaks and make any necessary adjustments before proceeding with the shower installation.
In addition to preparing the subfloor and installing the drain, you'll also need to address any surrounding walls or structures. Remove any damaged or outdated tiles, drywall, or other materials, and replace them with new waterproof materials, such as cement backer board or waterproof wall panels. Ensure that all seams and corners are properly sealed with silicone caulk or waterproof membrane to prevent water intrusion. By taking the time to properly remove the old tub and prep the area for the new drain installation, you'll create a solid foundation for your new shower and help prevent future water damage or leaks.
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Measure and mark drain location to ensure proper alignment
Before removing the existing tub, it's crucial to accurately measure and mark the location for the new shower drain to ensure proper alignment with the plumbing system. Start by locating the existing drain pipe that was connected to the tub. Use a measuring tape to determine the exact center of this pipe, as this will be the reference point for your new shower drain. Mark this center point clearly on the floor using a pencil or a piece of chalk. This initial mark will serve as the starting point for all subsequent measurements.
Next, consult the manufacturer’s instructions for your new shower drain to understand its dimensions and alignment requirements. Most shower drains require a specific distance from the walls or other fixtures to ensure proper water flow and installation. Measure the distance from the center mark of the drain pipe to the nearest walls or corners of the shower area. Use a level and a straightedge to draw straight lines from the center mark to the walls, ensuring these lines are perpendicular. This will help you visualize the alignment and make any necessary adjustments before proceeding.
To ensure the drain is level and will function correctly, use a laser level or a traditional bubble level to check the floor’s slope. The floor should have a slight gradient toward the drain to facilitate water drainage. If the floor is not already sloped, you may need to adjust your measurements or plan for additional floor modifications. Mark the desired slope direction from the center drain mark, ensuring it aligns with the natural or planned slope of the shower floor. This step is critical to prevent water pooling and ensure efficient drainage.
Once you’ve confirmed the alignment and slope, double-check all measurements to avoid errors. Use a utility knife or a scribe to score the floor along the marked lines, creating a clear guide for cutting or modifying the floor. If you’re working with tile or a solid surface, ensure the marks are precise to minimize material waste and ensure a clean fit for the new drain assembly. Take your time during this step, as accurate marking will save time and effort during the installation process.
Finally, verify the alignment of the drain location with the existing plumbing. Ensure the marked center point aligns perfectly with the drain pipe to avoid complications during installation. If the existing pipe needs to be adjusted or extended, make note of these requirements before proceeding. Proper alignment at this stage will ensure a seamless connection between the new shower drain and the plumbing system, preventing leaks and ensuring long-term functionality. Always measure twice and mark once to guarantee accuracy.
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Cut hole in subfloor for drain pipe fitting
Before cutting into your subfloor, ensure you have the necessary tools and materials: a reciprocating saw or jigsaw with a fine-tooth blade, a drill with a hole saw bit slightly larger than your drain pipe, a pencil, measuring tape, safety gear (gloves, goggles, dust mask), and a vacuum or broom for cleanup. Start by locating the existing drain pipe from the tub. Measure and mark the exact position where the new shower drain will align with the pipe. Double-check the measurements to avoid mistakes, as cutting too large or in the wrong spot can compromise the subfloor’s integrity.
Once you’ve confirmed the location, use your drill and hole saw to create a pilot hole in the subfloor. This hole should be just large enough to allow you to insert the blade of your reciprocating saw or jigsaw. Position the saw blade in the pilot hole and carefully begin cutting along the marked outline for the drain pipe fitting. Work slowly and steadily to maintain control and precision. If using a jigsaw, ensure the blade is suitable for cutting through the subfloor material, whether it’s plywood or particleboard.
As you cut, periodically stop to clear dust and debris from the area to maintain visibility and accuracy. Be mindful of any electrical wires, plumbing lines, or joists beneath the subfloor. If you’re unsure about what lies below, use a stud finder or inspect from below if possible. Avoid cutting into structural components, as this can weaken the floor. Once the hole is cut, test-fit the drain pipe to ensure it aligns perfectly with the existing plumbing.
After confirming the fit, smooth any rough edges around the hole with sandpaper or a utility knife. This step is crucial to prevent damage to the drain pipe or its fittings. If the subfloor is uneven, use a piece of scrap wood or shims to create a level surface around the hole. This ensures the shower drain assembly sits flush and secure. Finally, vacuum or sweep the area to remove any dust or debris before proceeding with the next steps of installing the shower drain.
Always prioritize safety during this process. Wear protective gear to avoid injury from sharp tools or airborne particles. If you’re unsure about any part of the process, consult a professional to ensure the work is done correctly and safely. Cutting the hole in the subfloor is a critical step in replacing a tub with a shower, as it directly impacts the functionality and longevity of the new drain system. Take your time and measure twice to cut once.
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Install shower drain assembly with waterproof sealant
When replacing a tub with a shower, installing the shower drain assembly with waterproof sealant is a critical step to ensure a leak-free and durable installation. Begin by preparing the area where the new drain will be placed. Remove any debris or old caulk from the existing drain flange and ensure the surface is clean and dry. If the tub drain is not compatible with a shower drain, you may need to cut out the old drain and modify the plumbing to accommodate the new shower drain assembly. Use a hole saw or reciprocating saw to carefully cut the opening to the correct size, following the manufacturer’s instructions for your specific drain kit.
Next, assemble the shower drain components according to the manufacturer’s guidelines. Typically, this involves attaching the drain body to the strainer or cover plate. Ensure all parts are securely connected and aligned properly. Before installing the drain, apply a generous bead of waterproof sealant (such as silicone or plumber’s putty) around the underside of the drain flange. This sealant acts as a barrier to prevent water from seeping beneath the drain and causing damage to the subfloor or surrounding structure. Press the drain assembly firmly into place, ensuring it sits flush with the shower floor.
Once the drain is positioned, secure it from below by tightening the screws or locking mechanism provided with the drain kit. This step ensures the drain remains stable and does not shift during use. Wipe away any excess sealant that squeezes out from the edges of the drain flange, using a damp cloth or finger to create a smooth, even seal. Allow the sealant to cure according to the product’s instructions before proceeding with the rest of the shower installation.
After the drain is installed and the sealant has cured, test the assembly for leaks by running water through the drain and checking for any signs of moisture below the shower. If no leaks are detected, proceed with installing the shower pan or waterproofing the shower floor. Properly installing the shower drain assembly with waterproof sealant is essential to prevent water damage and ensure the longevity of your new shower.
Finally, consider adding an additional layer of waterproofing around the drain area, especially if you’re using tile. Apply a waterproofing membrane or liquid waterproofing product to the shower floor and up the walls slightly to create a seamless barrier against moisture. This extra step provides added protection and peace of mind, ensuring your shower remains leak-free for years to come. With careful attention to detail and the use of waterproof sealant, installing a shower drain assembly in place of a tub is a manageable task that yields professional results.
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Connect drain pipe to existing plumbing system securely
When connecting the drain pipe to the existing plumbing system, the first step is to ensure compatibility between the new shower drain and the old tub’s plumbing setup. Measure the diameter of the existing drain pipe (typically 1.5 inches for tubs) and purchase a shower drain kit with a matching size. If the diameters differ, use a reducer coupling to create a secure transition. Shut off the water supply to the bathroom and remove any remaining tub components to access the drain pipe fully. Clean the area around the existing drain to ensure a debris-free connection.
Next, cut the existing drain pipe to the appropriate length using a hacksaw or PVC cutter, ensuring it aligns with the height of the new shower drain. Sand the edges of the cut pipe to smooth any rough surfaces, which will improve the seal and prevent leaks. Apply primer to the outside of the existing pipe and the inside of the new coupling or adapter, following the manufacturer’s instructions for the specific materials (PVC, ABS, etc.). Then, apply PVC glue to both surfaces and quickly join them together, holding the connection firmly for 30 seconds to allow the glue to set. Wipe away any excess glue with a rag.
Once the coupling is secure, attach the shower drain assembly to the drain pipe. Most shower drains come with a threaded adapter that fits into the coupling. Wrap plumber’s tape around the threads of the adapter to ensure a watertight seal, then tighten it by hand before using pliers or a wrench to secure it firmly. Avoid over-tightening, as this can damage the threads or crack the coupling. Test the connection by pouring water into the drain to check for leaks at the joint.
To further secure the drain pipe, use pipe straps or hangers to support the weight and prevent movement. Attach these straps to the floor joists or wall studs, ensuring the pipe remains stable and aligned with the shower drain. If the drain pipe needs to be extended or re-routed, use straight or angled PVC pipes and secure each joint with primer, glue, and straps. Double-check all connections for tightness and alignment before proceeding.
Finally, connect the P-trap to the drain pipe, ensuring it is properly aligned with the existing plumbing vent and waste lines. The P-trap should be installed at a slight angle to allow water to flow freely and prevent clogs. Secure the P-trap with slip nuts and washers, tightening them evenly to avoid leaks. Once all connections are made, turn the water supply back on and run water through the shower drain to test the entire system. Inspect all joints for leaks and tighten or repair as needed to ensure a secure and functional connection to the existing plumbing system.
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Frequently asked questions
While it’s possible to replace a bathtub with a shower drain as a DIY project, it’s recommended to hire a professional, especially if you’re not experienced with plumbing and waterproofing. Proper installation is critical to avoid leaks, water damage, and mold issues.
You’ll need tools like a reciprocating saw, pry bar, screwdriver, wrench, and a utility knife. Materials include a shower drain kit, waterproofing membrane, mortar or shower base, and possibly new plumbing fixtures. Always check local building codes for specific requirements.
First, ensure the drain is centered and level by using a spirit level. Follow the manufacturer’s instructions for installing the drain assembly. Apply a waterproofing membrane around the drain and seal all joints with silicone caulk to prevent leaks. Test the drain before completing the installation.
