How Do You Replace a Bathtub Shower Combo Step by Step?

AvatarByColleen Barnes Shower Hardware

Replacing a bathtub shower combo can transform the look and functionality of your bathroom, turning a dated or worn space into a fresh, modern retreat. Whether you’re upgrading for aesthetic reasons, improving water efficiency, or addressing damage, understanding the process is key to a successful renovation. This project, while manageable for many DIY enthusiasts, requires careful planning and attention to detail to ensure a seamless and long-lasting result.

At its core, replacing a bathtub shower combo involves removing the existing unit and installing a new one that fits your space and style preferences. It’s not just about swapping fixtures; it often includes updating plumbing, waterproofing, and ensuring proper drainage. This makes the task more complex than a simple fixture replacement, but also offers an opportunity to customize your bathroom to better suit your needs.

Before diving into the specifics, it’s important to consider the scope of work, the materials involved, and the tools you’ll need. Whether you’re aiming for a sleek, contemporary look or a classic design, understanding the basics will help you navigate the process with confidence. In the following sections, we’ll explore the essential steps and tips to guide you through replacing your bathtub shower combo efficiently and effectively.

Removing the Existing Bathtub Shower Combo

Begin by turning off the water supply to the bathroom to prevent leaks or flooding. Next, remove any fixtures attached to the bathtub, such as faucets, showerheads, and handles. Use appropriate tools like adjustable wrenches or screwdrivers to carefully detach these components without causing damage to the plumbing.

Remove the shower curtain rod or glass enclosure, if present. This will provide unobstructed access to the bathtub and surrounding walls. Inspect the area for caulking or grout sealing the tub to the wall or floor, and use a utility knife or scraper to cut through these seals.

Carefully detach the bathtub from the wall framing. Bathtubs are often secured with nails or screws along the flange where the tub meets the wall studs. Remove these fasteners and gently pull the tub away from the wall. Be mindful of any plumbing connections such as the drain and overflow pipes. These may need to be unscrewed or disconnected to free the bathtub.

Dispose of the old bathtub according to local regulations. Some tubs can be recycled, while others require special handling due to materials or coatings. Verify if professional disposal services are needed.

Preparing the Space for Installation

Once the old bathtub is removed, thoroughly inspect the wall framing, subfloor, and plumbing. Look for signs of water damage, mold, or rot, which must be addressed before installing the new unit. Repair or replace any compromised structural elements to ensure a solid foundation.

Check the alignment and condition of the drain and water supply lines. Adjustments may be necessary to accommodate the new bathtub’s configuration. It is essential that all plumbing connections are secure and leak-free.

Clean the area to remove debris, dust, and old adhesive residues. This will promote proper adhesion and sealing during installation. Consider installing a moisture-resistant backer board on the walls surrounding the tub area to protect against future water damage.

Installing the New Bathtub Shower Combo

Position the new bathtub in place, ensuring it fits snugly within the alcove or designated space. Use a level to verify that the tub is perfectly horizontal; adjust with shims as needed to prevent water pooling and drainage issues.

Secure the tub flange to the wall studs using corrosion-resistant screws or nails. Avoid overtightening to prevent damage to the tub material. Reconnect the drain assembly and overflow pipes, ensuring all seals and gaskets are properly seated to prevent leaks.

Reattach or install new faucets, shower valves, and fixtures according to manufacturer instructions. Use plumber’s tape on threaded connections to enhance water-tightness. Test all plumbing connections by turning on the water supply and checking for leaks.

Seal all gaps where the tub meets the walls or floor with high-quality, mildew-resistant caulk. This will prevent water infiltration and maintain a clean appearance.

Finishing Touches and Inspection

Install any surrounding wall panels, tiles, or splash guards as needed to complete the enclosure. Ensure that all surfaces are sealed properly to avoid moisture penetration. If installing tile, apply waterproof membrane beneath to enhance durability.

Replace or install trim pieces, such as baseboards or tub skirts, to create a polished look. Reinstall the shower curtain rod or glass enclosure to finish the functional space.

Perform a thorough inspection of the entire installation, paying close attention to plumbing connections, seals, and fixture operation. Confirm that the tub drains efficiently and that water pressure is consistent across all outlets.

Step Key Considerations Tools/Materials Needed
Removing Old Tub Turn off water, disconnect plumbing, avoid damaging walls Adjustable wrench, screwdriver, utility knife, pry bar
Preparing Space Inspect for damage, align plumbing, clean area Level, moisture-resistant backer board, cleaning supplies
Installing New Tub Level tub, secure flange, connect plumbing, seal gaps Shims, corrosion-resistant screws, plumber’s tape, caulk
Finishing & Inspection Install wall finishes, test plumbing, seal edges Tile/membrane (if needed), trim pieces, sealant

Common Challenges and Troubleshooting

During installation, uneven flooring may cause the bathtub to rock or drain improperly. Use shims strategically to stabilize the tub and maintain a level surface. If plumbing connections do not align with the new tub’s drain or faucet positions, consider extending or relocating pipes, which may require professional assistance.

Leaks around drains or fixtures typically result from improper sealing or damaged gaskets. Disassemble and reseal connections with plumber’s tape or replace faulty components. Persistent moisture behind wall panels may indicate inadequate waterproofing; ensure membranes and caulking are applied correctly.

If the tub or shower feels unstable after installation, double-check that all mounting screws are secure and that the framing provides sufficient support. Reinforce framing if necessary to avoid long-term issues.

Maintenance Tips for Longevity

Regularly inspect caulking and grout lines around the bathtub and shower to prevent water infiltration. Replace or repair seals at the first sign of cracking or peeling. Clean fixtures with non-abrasive cleaners to avoid damage to finishes.

Avoid using harsh chemicals or abrasive tools on the bathtub surface to maintain its integrity. Periodically check for leaks in plumbing connections and address any moisture issues promptly to prevent structural damage.

Consider installing a water softener if your water supply is hard, as mineral buildup can degrade fixtures and surfaces over time. Routine maintenance will extend the life of your bathtub shower combo and keep it functioning optimally.

Preparing the Bathroom for Bathtub Shower Combo Replacement

Before beginning the replacement of a bathtub shower combo, thorough preparation is essential to ensure a smooth installation process and avoid damage to surrounding areas.

Start by gathering all necessary tools and materials, including:

  • Pipe wrench and adjustable wrench
  • Utility knife and pry bar
  • Caulk remover and silicone caulk
  • Level and measuring tape
  • Plumbing supplies such as new drain assembly, shower valve, and fittings
  • Safety gear: gloves, safety glasses, and dust mask

Next, clear the workspace by removing any furniture, rugs, and toiletries from the bathroom. Cover floors and nearby fixtures with protective sheeting to prevent damage from debris or water.

Shut off the water supply valves to both the bathtub and shower. If individual valves are unavailable, turn off the main water supply to the home. Open faucets to drain remaining water from the pipes to minimize spills during removal.

Remove the shower curtain or doors carefully. If doors are present, unscrew and detach them, storing hardware securely for potential reuse or disposal.

Removing the Existing Bathtub Shower Combo

Proper removal of the existing unit minimizes damage and prepares the area for the new installation.

  • Disconnect plumbing connections: Detach the water supply lines from the shower valve and remove the drain cover. Use a pipe wrench to loosen fittings as needed.
  • Remove caulking and sealants: Use a utility knife or caulk remover to cut through old caulk around the bathtub edges, shower walls, and fixtures.
  • Detach shower walls or surround: If the shower walls are separate panels or tiles, carefully remove them. For tiled surrounds, chisel away grout and tiles to expose the tub flange.
  • Remove the bathtub: Bathtubs are typically secured with nails or screws to wall studs and floor joists. Pry off any trim or drywall carefully to access fasteners. Use a pry bar to detach the tub flange from the studs.
  • Extract the tub: Depending on the material and size, tubs can be heavy. Use appropriate lifting techniques or enlist assistance to safely remove the unit from the alcove.

Inspect the exposed plumbing and framing for damage or mold. Address any issues before proceeding with the installation.

Installing the New Bathtub Shower Combo

Installation requires precise alignment and secure connections to ensure proper function and durability.

Step Description Key Tips
Set the drain assembly Install the new drain and overflow assembly on the bathtub according to manufacturer instructions. Apply plumber’s putty under the drain flange for a watertight seal.
Position the bathtub Carefully place the tub into the alcove, aligning drain and overflow with plumbing. Use shims to level the tub and ensure it sits firmly on floor joists.
Secure the tub Fasten the tub flange to wall studs using corrosion-resistant screws. Verify tub remains level and stable before proceeding.
Connect plumbing Attach the drain trap and connect water supply lines to the shower valve and faucet. Use Teflon tape on threaded fittings to prevent leaks.
Install shower walls or surround Mount prefabricated wall panels or tile the surround as applicable. Ensure seams are sealed with waterproof caulk to prevent water intrusion.
Finish fixtures and sealing Install showerhead, faucet handles, and trim plates. Apply silicone caulk around tub edges and wall joints for a watertight finish.

Testing and Final Adjustments

After installation, it is critical to test the new bathtub shower combo to confirm proper operation and detect any leaks.

  • Turn on water supply: Gradually restore water flow to the bathtub and shower. Check all connections for leaks.
  • Test drainage: Fill the tub partially and drain to verify the drain assembly functions correctly and there is no standing water.
  • Check shower valve operation: Operate the shower controls to ensure water temperature and pressure are consistent and valves respond smoothly.
  • Inspect caulking: Verify all silicone seals have cured according to manufacturer guidelines and touch up any gaps as necessary.

Address any issues immediately to prevent water damage and ensure the longevity of the installation.

Professional Insights on How To Replace Bathtub Shower Combo

Linda Martinez (Certified Plumbing Contractor, National Home Renovation Association). Replacing a bathtub shower combo requires careful planning and precise measurements to ensure a proper fit and avoid water damage. It is essential to shut off the water supply before beginning and to inspect the existing plumbing for any corrosion or leaks. Using high-quality materials and waterproof sealants will extend the life of the installation and prevent costly repairs down the line.

James O’Connor (Licensed General Contractor, O’Connor Home Improvements). When undertaking a bathtub shower combo replacement, it’s critical to remove the old unit without damaging the surrounding walls or flooring. I recommend reinforcing the subfloor if necessary and ensuring the drain and water lines align perfectly with the new fixture. Taking the time to properly waterproof the enclosure and install a reliable shower valve will guarantee both functionality and durability.

Sarah Nguyen (Interior Designer and Bathroom Remodeling Specialist, Luxe Bath Studios). From a design perspective, replacing a bathtub shower combo offers an excellent opportunity to improve both aesthetics and usability. Selecting fixtures that complement the bathroom’s style while prioritizing ergonomics can transform the space. Additionally, integrating modern features like anti-scald valves and slip-resistant surfaces enhances safety and comfort for all users.

Frequently Asked Questions (FAQs)

What tools are necessary to replace a bathtub shower combo?
Essential tools include a pry bar, adjustable wrench, screwdriver set, utility knife, caulking gun, plumber’s putty, and a level. Additional tools like a reciprocating saw may be required for demolition.

How long does it typically take to replace a bathtub shower combo?
Replacement usually takes between two to four days, depending on the complexity of the installation, plumbing adjustments, and drying times for adhesives and sealants.

Do I need to hire a professional plumber for the replacement?
Hiring a professional plumber is recommended if you are unfamiliar with plumbing systems or local building codes. Proper installation ensures water-tight seals and prevents leaks.

Can I replace the bathtub shower combo without removing existing plumbing?
In some cases, you can reuse existing plumbing if the new unit matches the old one’s dimensions and connections. However, modifications may be necessary for different sizes or configurations.

What materials are best for a durable bathtub shower combo replacement?
Acrylic and fiberglass are popular for their durability, ease of maintenance, and affordability. Cast iron or enameled steel offer longevity but require professional handling due to weight.

How do I ensure proper waterproofing during replacement?
Use high-quality waterproof membranes, seal all joints with silicone caulk, and install a vapor barrier behind wall panels. Proper sloping of the tub and shower base is also critical to prevent water pooling.
Replacing a bathtub shower combo involves careful planning, precise measurements, and a clear understanding of plumbing and installation requirements. The process typically includes removing the existing unit, preparing the space, ensuring proper waterproofing, and installing the new combo with attention to alignment and secure fittings. It is essential to follow manufacturer instructions closely and to comply with local building codes to ensure a safe and durable installation.

Key takeaways from the replacement process emphasize the importance of thorough preparation, including shutting off water supply and protecting surrounding areas to prevent damage. Accurate measurements and selecting the right bathtub shower combo that fits the space and meets functional needs are critical for a successful outcome. Additionally, addressing plumbing connections and sealing joints properly will help avoid leaks and water damage over time.

Ultimately, while replacing a bathtub shower combo can be a manageable DIY project for those with experience, consulting or hiring a professional plumber or contractor is advisable for complex installations or when dealing with outdated plumbing systems. Prioritizing quality materials and meticulous workmanship will ensure the new bathtub shower combo provides both aesthetic appeal and long-lasting performance.

Author Profile

Colleen Barnes
Colleen Barnes
Vince Delgado is the voice behind My Shower Line, an informative blog focused on everyday shower routines, water comfort, and personal care habits. Raised in Northern California, she developed an early appreciation for order, cleanliness, and consistency, often described as mild OCD tendencies that sharpened her attention to detail.

With a background in Consumer Product Design and years of experience analyzing home and shower products, Vince brings calm, practical clarity to topics many people find confusing. Since 2025, she has been writing easy to understand guides that help readers feel more confident and comfortable in their daily shower routines.