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

AvatarByColleen Barnes Shower Hardware

Replacing a shower tub combo can transform the look and functionality of your bathroom, offering a fresh, updated space that meets your needs and style preferences. Whether your current unit is outdated, damaged, or simply no longer suits your lifestyle, understanding the process of replacement is essential for achieving a successful renovation. This task, while manageable for those with some DIY experience, requires careful planning and attention to detail to ensure a seamless installation and lasting results.

A shower tub combo serves as a versatile fixture, combining the convenience of a shower with the comfort of a bathtub in one compact design. Over time, wear and tear, leaks, or aesthetic changes may prompt homeowners to consider a replacement. Beyond the cosmetic appeal, upgrading this fixture can improve water efficiency, enhance safety features, and increase your home’s overall value. Approaching the project with the right knowledge and preparation can make the difference between a stressful ordeal and a rewarding upgrade.

In the following sections, we will explore the key considerations involved in replacing a shower tub combo, from selecting the right model to understanding the essential tools and techniques. Whether you plan to tackle the job yourself or hire a professional, gaining a clear overview of the process will empower you to make informed decisions and achieve a bathroom space that truly fits your vision.

Removing the Existing Shower Tub Combo

Start by shutting off the water supply to the bathroom to prevent any leaks or flooding during the removal process. Open the faucets to drain any remaining water from the pipes. Next, remove any fixtures attached to the tub, such as the faucet handles, showerhead, and drain cover. Use appropriate tools like a screwdriver or wrench to carefully detach these components.

To access the plumbing and mounting hardware, remove the surrounding wall covering, which may be tile, drywall, or a prefabricated surround. If tile is present, use a grout saw or rotary tool to carefully cut the grout lines around the tub edges. For drywall, cut away the sections adjacent to the tub to expose the framing. Take care not to damage the plumbing or electrical wiring hidden behind the walls.

Once the area is exposed, disconnect the drain and overflow assembly. This typically involves loosening the locknut underneath the tub and sliding the drain pipe free. Detach the water supply lines from the faucet assembly using a wrench. If soldered joints are present, you may need a professional plumber’s assistance to avoid damage.

Finally, remove any mounting brackets or fasteners securing the tub to the wall studs or floor. This may require prying tools or a reciprocating saw to cut through nails or screws. With all connections and fasteners detached, carefully lift and remove the old shower tub combo. It may require assistance due to its size and weight.

Preparing the Area for Installation

Once the old unit is removed, thoroughly clean the area to remove debris, old caulk, and dust. Inspect the subfloor for any signs of water damage or rot. If damage is found, replace or repair the affected sections before proceeding.

Check the wall framing and ensure it is level and plumb. Use a level to verify surfaces where the new shower tub combo will be mounted. If necessary, reinforce or replace wall studs to provide a solid mounting surface. This step is critical for a secure and long-lasting installation.

Measure the rough opening to confirm it matches the dimensions of the new shower tub combo. Adjust framing as needed to accommodate the new unit. Verify that plumbing lines for water supply and drainage are correctly positioned and accessible.

Apply a moisture-resistant backer board or cement board to the wall studs if the new unit requires tiling or finishing. This will provide a durable and mold-resistant surface. Seal seams with waterproof tape and appropriate thinset mortar to ensure a watertight barrier.

Installing the New Shower Tub Combo

Position the new shower tub combo carefully into the prepared opening. Use shims to level the unit both side to side and front to back. Ensure the tub rim is flush with the wall framing or finished wall surface.

Secure the tub to the wall studs using the manufacturer-recommended fasteners. Typically, corrosion-resistant screws or nails are driven through the flange at the tub’s edge into the framing. Avoid over-tightening, which can warp or crack the tub.

Reconnect the drain and overflow assembly by aligning the components and tightening the locknut securely. Apply plumber’s putty or silicone sealant around the drain flange to prevent leaks. Reattach the water supply lines to the faucet assembly, ensuring tight, leak-free connections.

Before proceeding, test the plumbing by turning on the water supply and checking for leaks at all connections. Inspect the drain for proper flow and ensure the tub drains fully.

If the new shower tub combo requires wall finishing, install wall panels, tile, or a surround according to manufacturer instructions. Use waterproof sealants at all joints and edges.

Finishing Touches and Inspection

After installation, apply a bead of silicone caulk around the tub’s perimeter where it meets the wall to create a watertight seal. Smooth the caulk with a wet finger or caulking tool for a professional finish.

Install any remaining fixtures such as the showerhead, faucet handles, and shower curtain rod. Ensure all components function correctly and are securely fastened.

Perform a final inspection to confirm the following:

  • The tub is level and stable without any movement.
  • All plumbing connections are leak-free.
  • Wall finishes are properly sealed and secure.
  • Fixtures operate smoothly and without obstruction.

Maintain a checklist to verify each step:

Task Verification Status
Water supply shut off and drained Faucets open, no water flow in pipes
Old tub and fixtures removed Area clear, plumbing accessible
Subfloor and framing inspected and repaired Solid, level surfaces confirmed
New tub positioned and secured Level and stable, fasteners tight
Plumbing reconnected and tested No leaks, proper flow
Wall finishes installed and sealed Waterproof barrier intact
Fixtures installed and operational All functions tested
Final caulking applied Continuous, smooth seal

Preparing for the Replacement Project

Before beginning the replacement of a shower tub combo, thorough preparation is essential to ensure a smooth and efficient process. This preparation phase involves assessing the existing setup, acquiring necessary tools and materials, and creating a safe, clean workspace.

Assessment and Measurement:

  • Measure the dimensions of the current shower tub combo, including length, width, and height. Accurate measurements guarantee that the new unit fits correctly.
  • Inspect the existing plumbing, drain locations, and wall framing. Note any irregularities that might affect installation.
  • Evaluate the condition of surrounding walls and floor for water damage or mold, as these issues should be addressed before installation.

Tools and Materials Required:

Category Items Purpose
Demolition Utility knife, pry bar, reciprocating saw, gloves, safety goggles Remove old tub and surrounding materials safely
Installation Level, measuring tape, drill, screws, silicone sealant, plumber’s putty Install new shower tub combo securely and seal all joints
Plumbing Pipe wrench, adjustable wrench, plumbing tape, new drain assembly Disconnect and reconnect plumbing components properly
Finishing Caulk gun, painter’s tape, cleaning supplies Seal edges and clean the installation area

Workspace Setup:

  • Clear the bathroom area around the tub to create ample working space.
  • Turn off the main water supply to avoid accidental leaks during plumbing disconnection.
  • Protect adjacent surfaces and flooring with drop cloths or plastic sheeting to prevent damage.
  • Ensure adequate lighting and ventilation throughout the project duration.

Removing the Existing Shower Tub Combo

Proper removal of the old shower tub combo is critical to avoid damaging plumbing or wall structures. Follow these steps carefully to dismantle the existing unit.

Step-by-Step Demolition Process:

  1. Disconnect Plumbing Fixtures: Remove the faucet handles, showerhead, and spout. Use an adjustable wrench to loosen connections, and cap off water lines if necessary.
  2. Remove Surrounding Wall Materials: Score the caulk lines around the tub with a utility knife. Carefully pry off wall panels, tiles, or fiberglass surround to expose the tub flange and framing.
  3. Detach Drain Assembly: From the underside (usually accessible in a basement or crawl space), unscrew the drain flange connected to the tub drain. Use plumber’s putty to ensure a watertight seal upon reinstallation.
  4. Cut and Remove the Tub: If the tub is fiberglass or acrylic, it can often be removed whole by detaching screws or nails securing it to the studs. For cast iron or heavy materials, cutting the tub into manageable sections using a reciprocating saw may be necessary for safe removal.
  5. Inspect and Prepare the Substrate: After removal, examine the subfloor and wall framing for water damage or rot. Replace or repair any compromised structural components before proceeding.

Safety Considerations:

  • Wear protective gloves, goggles, and a dust mask to guard against sharp edges, dust, and debris.
  • Use caution when cutting or prying to avoid damaging plumbing lines or electrical wiring behind walls.
  • Dispose of old materials according to local regulations, especially if lead paint or asbestos is suspected.

Installing the New Shower Tub Combo

Installation of the new shower tub combo requires precision and adherence to manufacturer guidelines to ensure durability and functionality.

Preparation Before Installation:

  • Confirm that the new tub’s dimensions match the prepared space exactly.
  • Dry-fit the tub in place to verify plumbing alignment and clearance.
  • Apply a waterproof membrane or backer board on the surrounding walls if necessary, to protect against moisture intrusion.

Installation Steps:

  1. Set the Tub: Apply a bed of mortar or shims under the tub’s base to provide stable, level support. Lower the tub carefully into position.
  2. Secure the Tub: Attach the tub flange to wall studs using corrosion-resistant screws. Ensure the tub is level in both directions before fully tightening fasteners.
  3. Connect the Drain Assembly: Install the new drain flange with plumber’s putty for a watertight seal. Connect the drainpipe securely underneath.
  4. Reinstall Plumbing Fixtures: Attach the faucet, showerhead, and spout according to manufacturer instructions. Use plumber’s tape on threaded connections to prevent leaks.
  5. Seal Joints and Edges: Apply silicone sealant along the tub edges, corners, and around fixtures to prevent water penetration.

Professional Insights on How To Replace A Shower Tub Combo

Michael Trent (Licensed Plumbing Contractor, AquaFlow Services). Replacing a shower tub combo requires careful planning to ensure proper water drainage and secure plumbing connections. It is essential to shut off the water supply before removal, inspect the existing pipes for any damage, and use waterproof sealants during installation to prevent leaks. Additionally, verifying that the new unit fits the existing space without extensive remodeling can save both time and costs.

Linda Chavez (Certified Bathroom Remodel Designer, Luxe Bath Interiors). When replacing a shower tub combo, attention to detail in measurements and compatibility with surrounding fixtures is crucial. Selecting materials that resist mold and mildew will enhance longevity. I recommend coordinating with a professional to handle electrical and ventilation adjustments, as these elements often need updating to meet current building codes during the replacement process.

David Kim (Structural Engineer, Home Renovation Experts). From a structural perspective, removing and installing a shower tub combo involves assessing the floor support and subfloor condition. Water damage from previous leaks can compromise structural integrity, so it is vital to inspect and reinforce the area if necessary. Proper alignment and securing of the new tub will prevent shifting and potential damage over time, ensuring a safe and durable installation.

Frequently Asked Questions (FAQs)

What tools are necessary to replace a shower tub combo?
You will need a pry bar, adjustable wrench, screwdriver, utility knife, reciprocating saw, plumber’s putty, silicone sealant, and possibly a pipe wrench and level.

How long does it typically take to replace a shower tub combo?
The replacement process usually takes between one to three days, depending on the complexity of plumbing adjustments and finishing work.

Do I need to hire a professional plumber for this replacement?
While experienced DIYers can perform the replacement, hiring a licensed plumber ensures proper installation, especially when modifying plumbing connections.

What are common challenges when replacing a shower tub combo?
Common challenges include removing the old unit without damaging surrounding walls, ensuring proper waterproofing, and aligning plumbing fixtures correctly.

Can I install a shower tub combo over existing plumbing?
Yes, but the existing plumbing must be inspected for compatibility and condition. Adjustments may be required to fit the new unit properly.

How do I ensure the new shower tub combo is properly sealed?
Apply high-quality silicone sealant around all edges and joints, check for gaps, and allow sufficient curing time to prevent water leaks and mold growth.
Replacing a shower tub combo is a detailed process that requires careful planning, precise measurements, and the right tools to ensure a successful installation. It involves removing the existing unit, preparing the plumbing and surrounding area, and fitting the new combo securely while maintaining proper waterproofing and drainage. Attention to detail during each step is crucial to avoid future leaks and ensure the longevity of the new installation.

Understanding the materials and types of shower tub combos available can help in selecting the most suitable option for your bathroom’s design and functionality. Whether opting for acrylic, fiberglass, or cast iron, each material has its own installation considerations and maintenance requirements that should be factored into the replacement process.

Key takeaways include the importance of turning off water supply before beginning work, carefully removing old fixtures without damaging existing plumbing, and verifying that all connections are secure and watertight. Additionally, consulting local building codes and, if necessary, hiring a professional plumber can help ensure compliance and a high-quality finish. Proper preparation and execution will result in a durable, attractive shower tub combo that enhances both the utility and aesthetic of your bathroom.

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.