Noah Rivers
Replacing a bath with a shower tray is a popular bathroom renovation project that can modernize your space, save water, and improve accessibility. The process involves several key steps, including removing the existing bath, preparing the area, ensuring proper plumbing adjustments, and securely installing the new shower tray. While it can be a DIY project for those with intermediate skills, it often requires careful planning, the right tools, and attention to detail to avoid issues like leaks or improper alignment. This guide will walk you through the essential steps to successfully complete the transformation, ensuring a functional and stylish shower area.
| Characteristics | Values |
|---|---|
| Project Difficulty | Moderate to Advanced (requires plumbing and tiling skills) |
| Tools Required | Screwdriver, wrench, utility knife, pry bar, silicone remover, drill, etc. |
| Materials Needed | Shower tray, shower mixer, waste kit, tiles, adhesive, grout, sealant |
| Time Estimate | 1-3 days (depending on skill level and complexity) |
| Cost Range | £500 - £2,000+ (including materials and labor) |
| Steps Involved | 1. Turn off water supply 2. Remove bath panels and fixings 3. Disconnect waste and overflow 4. Remove bath 5. Prepare floor for shower tray 6. Install waste kit 7. Fit shower tray 8. Connect plumbing 9. Tile walls (if needed) 10. Seal edges and grout |
| Common Challenges | Dealing with old plumbing, uneven floors, and waterproofing |
| Safety Precautions | Turn off water, wear protective gear, ensure proper ventilation |
| Permits Required | Check local building regulations (often required for plumbing changes) |
| Environmental Impact | Reduced water usage compared to baths, but disposal of old bath required |
| Maintenance Tips | Regularly clean shower tray and seals to prevent mold and leaks |
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What You'll Learn
- Planning and Measurement: Measure bathroom space, choose shower tray size, ensure proper drainage, and plan layout
- Removing the Bathtub: Disconnect plumbing, break or remove tub, clean area, and inspect for damage
- Preparing the Floor: Level floor surface, install waterproofing, and ensure slope for drainage
- Installing the Shower Tray: Position tray, secure with adhesive, connect waste pipe, and seal edges
- Final Touches: Tile walls, install shower screen, test drainage, and clean for use
Planning and Measurement: Measure bathroom space, choose shower tray size, ensure proper drainage, and plan layout
Before dismantling your bathtub, precision in planning and measurement is paramount. Start by assessing the existing bathroom layout with a tape measure, noting the dimensions of the space where the shower tray will reside. Consider not just the length and width but also the height, especially if you’re working with a sloped ceiling or awkward corners. A common mistake is underestimating the space needed for shower doors or curtains, so add an extra 6–8 inches to your width measurement to ensure comfortable access. Sketching a rough diagram can help visualize how the tray fits within the room’s constraints.
Choosing the right shower tray size is a balance between aesthetics and functionality. Standard trays range from 700mm x 700mm for compact spaces to 1700mm x 800mm for larger bathrooms, but custom sizes are available for unique layouts. Consider the user’s needs—a larger tray may be preferable for families or those with mobility concerns, while a smaller one can maximize floor space in tight quarters. Material matters too: acrylic trays are lightweight and cost-effective, while stone resin offers durability and a premium finish. Always cross-reference the tray’s dimensions with your measurements to avoid costly errors.
Drainage is the unsung hero of a successful shower installation. Ensure the existing waste pipe aligns with the tray’s outlet, typically located centrally or at one end. If misalignment occurs, you may need to reposition the pipe or select a tray with an adjustable waste position. The floor must also slope slightly toward the drain to prevent water pooling—a gradient of 1–2 degrees is ideal. If your bathroom floor is concrete, this may require professional grinding; for wooden floors, use self-levelling compound to create the necessary slope.
Planning the layout goes beyond the tray itself. Think about the surrounding elements: will the shower be enclosed by glass panels, or will it be a walk-in design? Position the tray away from high-traffic areas to prevent accidental slips, and ensure there’s enough clearance for shower controls and accessories. If replacing a bath, consider repurposing the existing plumbing to minimize costs, but be prepared to adjust pipework if the tray’s location differs significantly. A well-thought-out layout not only enhances functionality but also elevates the bathroom’s overall aesthetic.
Finally, anticipate challenges by double-checking measurements and consulting manufacturer guidelines. For instance, some trays require a specific type of waste kit or additional waterproofing beneath. If in doubt, seek advice from a plumber or builder to avoid common pitfalls like inadequate support or poor sealing. With meticulous planning and attention to detail, the transition from bath to shower tray can transform your bathroom into a more modern, efficient space.
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Removing the Bathtub: Disconnect plumbing, break or remove tub, clean area, and inspect for damage
The first step in transforming your bathroom from a bath to a shower is a careful dismantling process, beginning with the plumbing. Before you wield any tools, ensure you turn off the water supply to the bathtub to avoid unwanted spills. Locate the shut-off valves under the tub or near the main water supply and turn them clockwise until they’re fully closed. If your tub lacks individual shut-offs, you may need to turn off the main water supply to the house. Once the water is off, open the bathtub faucet to drain any remaining water from the pipes. Next, disconnect the overflow drain and the main drain pipes using a wrench or pliers. Be cautious not to force anything, as older pipes may be brittle and prone to cracking. Wrap the pipe threads with Teflon tape or apply pipe compound to prevent leaks when you reinstall the plumbing later.
With the plumbing disconnected, the bathtub itself becomes the focal point. Removing a bathtub is no small feat—it’s heavy, bulky, and often secured to the floor or walls. If the tub is made of cast iron or steel, consider breaking it into manageable pieces using a reciprocating saw or sledgehammer. Lay down a tarp or drop cloth to catch debris and protect your floor. For fiberglass or acrylic tubs, you may be able to remove it whole by unscrewing it from the wall studs or floor joists. Enlist a helper to lift and carry the tub safely, as it can weigh several hundred pounds. If breaking the tub is necessary, wear safety goggles, gloves, and a dust mask to protect yourself from sharp edges and airborne particles.
Once the tub is removed, the exposed area will likely reveal a less-than-pristine surface. Years of moisture and soap scum can leave behind stains, mold, or mildew. Clean the area thoroughly using a mixture of bleach and water (1 part bleach to 10 parts water) to kill any lingering mold spores. Scrub the walls and floor with a stiff brush, paying special attention to corners and crevices. For stubborn stains, a commercial mold and mildew remover or a paste of baking soda and water can be effective. Allow the area to dry completely before proceeding, as moisture trapped beneath the new shower tray can lead to future problems.
Finally, inspect the area for damage that may have gone unnoticed beneath the bathtub. Check for signs of water damage, such as rotting subflooring, weakened wall studs, or compromised drywall. If you discover structural issues, address them immediately to ensure a stable foundation for your new shower tray. Look for plumbing leaks or corroded pipes that may need replacement. This step is crucial not only for the longevity of your new shower but also for the safety and integrity of your home. If you’re unsure about the extent of the damage, consult a professional to avoid costly mistakes down the line.
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Preparing the Floor: Level floor surface, install waterproofing, and ensure slope for drainage
A level floor is the foundation of a successful shower tray installation. Even a slight gradient can lead to water pooling, causing leaks and structural damage over time. Before you begin, assess the existing floor's level using a long spirit level. Mark any high or low spots, and plan to address them with self-levelling compound. This two-part epoxy or latex-based mixture is poured onto the floor, naturally finding its own level. Follow the manufacturer's instructions for mixing ratios and drying times, typically around 24 hours for a 3mm layer.
Waterproofing is non-negotiable in wet areas. After levelling, apply a liquid waterproofing membrane, such as a polymer-modified cementitious coating, in two coats. The first coat should be diluted with water (usually 5-6 parts water to 1 part product) and applied with a roller or brush, allowing it to dry for 4-6 hours. The second coat, undiluted, is then applied at a right angle to the first, creating a cross-hatched pattern for maximum coverage. Pay special attention to corners, seams, and around drains, where water is most likely to penetrate.
While a level floor prevents water from pooling in unwanted areas, a slight slope ensures it drains efficiently. The ideal gradient is 1-2% toward the drain, meaning a 1-2mm drop for every 100mm of floor space. Achieve this by building up the floor around the drain with additional levelling compound or a pre-sloped shower base. Test the slope by pouring a small amount of water onto the floor—it should flow smoothly toward the drain without hesitation.
Consider using a pre-formed shower tray base if you're unsure about creating the correct slope manually. These bases are designed with the gradient already built-in, simplifying the process. However, they may require additional waterproofing at the edges where they meet the surrounding floor. Always follow the manufacturer's guidelines for installation, especially regarding the type of adhesive or mortar bed needed to secure the tray base firmly in place.
In summary, preparing the floor for a shower tray involves a meticulous process of levelling, waterproofing, and creating a subtle slope. Each step is crucial to prevent water damage and ensure the longevity of your installation. By using the right materials and techniques, you can create a solid foundation that will support your shower tray for years to come, even in the wettest of environments.
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Installing the Shower Tray: Position tray, secure with adhesive, connect waste pipe, and seal edges
Positioning the shower tray is the first critical step in ensuring a functional and aesthetically pleasing shower installation. Begin by measuring the space where the bath once stood, ensuring the tray aligns perfectly with the existing plumbing and wall tiles. Use a spirit level to confirm the tray is flat and even, as any tilt can lead to water pooling or drainage issues. For rectangular trays, center it within the alcove, leaving equal gaps on either side for sealing. If your tray has a specific orientation due to a built-in slope or waste position, double-check the manufacturer’s instructions to avoid costly mistakes.
Securing the tray with adhesive is where precision meets permanence. Apply a high-quality, waterproof adhesive like silicone sealant or polyurethane foam to the base of the tray, following the manufacturer’s recommended dosage (typically a bead of adhesive 10–12 mm thick). Press the tray firmly into place, using spacers or wedges to maintain alignment until the adhesive sets. Avoid overloading the tray with weight during this curing period, which can take up to 24 hours depending on the product. This step is non-negotiable—a poorly secured tray can shift, crack, or leak over time, undermining the entire installation.
Connecting the waste pipe is a plumbing task that demands attention to detail. Start by attaching the trap to the tray’s waste outlet, ensuring a tight seal with PTFE tape or a rubber gasket. Then, connect the trap to the existing waste pipe, using a flexible waste pipe if necessary to accommodate any misalignment. Test the connection by pouring water into the tray and checking for leaks beneath the trap. If your bathroom floor slopes toward the waste, consider adding a small gradient to the tray’s base during installation to improve drainage efficiency.
Sealing the edges of the shower tray is the final barrier against water damage. Apply a generous bead of silicone sealant around the perimeter where the tray meets the walls and floor, smoothing it with a wet finger or sealant tool for a neat finish. Choose a mold-resistant sealant for longevity, especially in humid environments. Allow the sealant to cure fully (usually 12–24 hours) before using the shower. Proper sealing not only prevents leaks but also creates a seamless transition between the tray and surrounding surfaces, enhancing the overall appearance of your new shower.
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Final Touches: Tile walls, install shower screen, test drainage, and clean for use
Tiling the walls around your new shower tray is more than an aesthetic choice—it’s a functional necessity. Waterproof tiles prevent moisture from seeping into drywall or plaster, which can lead to mold, rot, or structural damage. Choose tiles specifically designed for wet areas, such as ceramic or porcelain, and ensure the grout is water-resistant. When laying tiles, start from the center of the wall to ensure symmetry and use spacers for consistent gaps. Allow the adhesive and grout to cure fully (typically 24–48 hours) before exposing the area to water. This step not only enhances durability but also elevates the overall look of your shower space.
Installing a shower screen is a critical step that balances practicality with style. Unlike a full shower curtain, a screen minimizes water splatter while maintaining an open, modern feel. Measure the space carefully before purchasing to ensure a proper fit, and opt for tempered glass for safety. Most screens come with mounting hardware, but double-check that your wall material (tile, concrete, etc.) can support the weight. If drilling into tiles, use a carbide-tipped drill bit to avoid cracking. Once installed, test the screen’s stability by gently pressing on it to ensure it’s securely anchored.
Before declaring your new shower ready for use, test the drainage system thoroughly. Pour several buckets of water into the tray and observe how quickly it drains. If water pools or drains slowly, check for clogs in the waste pipe or ensure the tray’s gradient is correctly sloped toward the drain. A poorly functioning drain can lead to standing water, which breeds bacteria and stains the tray. If issues persist, consult a plumber to avoid long-term problems. Proper drainage is non-negotiable for both hygiene and the longevity of your installation.
Cleaning the shower area post-installation is the final step to ensure it’s ready for daily use. Remove any construction dust, grout residue, or adhesive stains with a non-abrasive cleaner and a soft cloth. Avoid harsh chemicals that could damage new tiles or the shower tray’s finish. For glass screens, use a squeegee to remove water spots and a vinegar-water solution for streak-free shine. This initial clean not only makes the space inviting but also sets a standard for maintenance, ensuring your shower remains a pristine and functional addition to your bathroom.
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Frequently asked questions
You will need a utility knife, pliers, adjustable wrench, screwdriver, hacksaw, silicone sealant remover, measuring tape, level, and possibly a reciprocating saw for cutting pipes or the bath.
Turn off the water supply, then use pliers or an adjustable wrench to disconnect the waste pipe and overflow. For water supply lines, unscrew the connections at the taps or valves. Ensure all water is drained before proceeding.
Prepare the floor by ensuring it’s flat and level. Use a bed of mortar or a pre-made shower tray base for stability. Check the tray’s level with a spirit level and adjust as needed. Apply silicone sealant around the edges and drain to prevent leaks.
