A spout pipe (if you don’t have a pre-installed copper pipe)
Pliers to fasten and unfasten the existing plumbing
The actual drain installation process is relatively straightforward. You’ll take steps to make it easy to hook the existing plumbing into the bathtub drain.
8 Steps to Install a Bathtub on a Concrete Floor
Step 1. Secure your spray area
The “spray area” refers to any part of the wall and floor that might be splashed with water when you use the tub. That means the area directly surrounding the tub itself.
Whether you’re working on bare concrete or a tile floor, you need to make sure that this area is waterproof. Otherwise, you could end up dealing with mildew.
You’ll need to pick up a waterproof sealant at the hardware or plumbing store. Before you set the sealant on the walls, use a rag and soap to clean them thoroughly.
If there’s dirt or dust on the surface, the sealant won’t be able to adhere properly. It might peel off or be ineffective.
Step 2. Level your floor
If you’re lucky, you won’t have to do anything special to your floor. But it’s common for concrete flooring to be uneven.
When you install a bathtub, the floor below must be even to get the correct balance. Uneven balancing can also warp and damage a fiberglass bathtub.
Inspect your floor. Are there uneven spaces? Where?
Your next step will be to coat the concrete slab in the waterproof sealant or caulk. You should use multiple layers of this substance until you have an even surface, using your notched trowel for guidance.
Wait for the sealant to dry completely before you continue.
Step 3. Place your bathtub
This might sound like the easiest step, but it actually requires enormous care and patience. You’ll put the bathtub exactly where it is supposed to sit.
To make life easier, you should place the tub wherever you already have drain plumbing. Do your best to line the tub drain hole up with the existing spout plumbing.
You might want to work with a partner. It’s important that you’re gentle when setting the tub down, as being too rough might cause the surface of the floor or the drain itself to become damaged.
Step 4. Level your bathtub
Next, you’ll worry about the leveling process. You want to make sure that each corner of the bathtub has an even placement on the floor.
This is where your rubber mallet and 2×4″ come into play. You’ll wedge the wood against the tub and tap it until it reaches the proper area. Be sure that the bottom of the tub is in the right spot against the sealant.
Step 5. Screw the bathtub in
Your bathtub model should have come with screws for the installation process. You’ll drill these into the drywall and secure the bathtub flange to the wall.
The manual will likely have instructions for how to do this. As a general rule, you should have one screw along every six inches of tub flange. Tighten them as needed.
Step 6. Insert the drain
Now you have the bathtub lined up with your existing drain pipe. It’s time to take the threading pipe and insert it securely into the male type of thread until you reach the bottom of the drain.
Since you’re using your existing plumbing, this step should be relatively simple.
Step 7. Install the remaining components
Other parts of the bathtub will need to be hooked up to the plumbing. These include the overflow rod, linkage, and plunger.
Make sure you install them correctly with the overflow hole so that the bathtub can drain excess water. Then tighten the contraption using screws.
Step 8. Thread the spout
This final step is super simple. You’ll just take your spout pipe, insert it into the hole, and fasten it with pliers. Some models may already have their spout installed, rendering this step unnecessary.
Installing a bathtub on a concrete floor doesn’t have to be difficult. You mainly want to ensure that the floor is even and that the bathtub model is placed properly. As long as you use the correct tools and take care of your work, you shouldn’t run into any issues.
Installing the drain and plumbing should be similarly simple. It’s best to line up the tub with the existing plumbing, so you don’t need to re-thread any of the pipes.