How to Install a Bathtub
For starters, a relaxing soak is the reward.
Whether you’re replacing an old bathtub or starting from scratch, the process of installing a new bathtub doesn’t have to be daunting. For the easiest and most seamless install, we recommend consulting a professional. But for the ambitious among us, this step-by-step guide for how to install a bathtub can serve as your starting point – just don’t forget to soak afterwards as your reward!
What You Will Need
- Adjustable wrench
- Pry bar
- Utility knife
- Adhesive remover
- Screwdriver (phillips and flathead)
- Pliers
- Slip-joint pliers
- Hammer
- Gloves
- Safety glasses
- Sledgehammer
- Shower stem socket wrench
- Leveling bar
- Keyhole saw
- Self-leveling compound
- At least two people
How to Install a Bathtub
Note: procedures and steps may vary depending on tub type. Always check your bathtub’s instructions before installation. Below are general guidelines to follow for how to replace a bathtub.
Step 1: Select Your New Bathtub
As we mentioned, there are various tub types that may require specific installation instructions, so before you move forward, it’s best to choose your new tub. This gives you an idea of what to expect when installing. Choose from a variety of bathtubs that fit your bathroom and style. Popular bathtub styles include alcove, drop-in, and freestanding.
Before you begin the installation process, check the quality of your supply pipes, drain pipes, and shutoff valves. If you see discoloration, stains, dimpling, pimples, or flaking, it could be caused by corrosion and new pipes should be installed.
Step 3: Turn Off the Water Supply
Locate and shut off the main water supply for your home. To bleed the water pressure off the lines, open your tub and sink faucets, allowing the water to run until it becomes a slow drip. This step ensures that you will stay dry as you remove and install your new tub.
With a screwdriver, unscrew any attached components, like the drain cover, drain basket, overflow valve, and faucet.
Step 5: Disconnect the Drain
Gain access to the underside of the tub, and use pliers to disconnect the pipes and remove the drain.
Step 6: Remove the Tub
Use a utility knife, adhesive remover, and pry bar to remove the tub from the alcove or encasement. Clear remaining screws and nails, and cut away remaining caulk. It’s best to wear safety gloves and glasses for this step to protect yourself from any debris that may fly out of the wall when removing your tub.
Make sure that your bathroom subfloor is level by using a leveler. If necessary, apply a self-leveling compound by using a steel trowel and spike roller and let it dry between coats.
Step 8: Mark the Tub Space
Set the new tub in place and use a pencil to mark the location of the top and/or outside ledge. Then, set the tub aside.
Step 9: Install the Supports
Measure and attach a ledger board one inch below the marks to support the bathtub. Fasten with coarse drywall screws. Repeat on all tub-supporting walls.
Step 10: Connect the Drain
Turn the tub on its side, and install the drain according to the manufacturer’s instructions. Use a plumber's putty around the underside of the drain basket, and screw the drain into place. To connect the overflow valve, place the rubber gasket onto the overflow elbow, and position it behind the tub. Then attach the cover plate to the overflow elbow and connect the overflow to the drain pipes.
Step 11: Secure the Tub
Lift the bathtub in place and align the drain with the overflow plumbing. Connect the pipes and tighten. Nail the flange (which connects the tub to shower walls) to the studs in the wall. Refinish the wall or tub encasement and reattach the spout.
Tip!
Before choosing a new bathtub, consider where the drain is on your current tub. Try to find a new tub that has the drain on the same side for easier plumbing. For more tips on how to choose a bathtub, check out our guide How to Choose a Bathtub.
Now that you know how to install a bathtub, it’s time to find your new favorite soaker!
