Tips For Installing a New Bathtub

Tips For Installing a New Bathtub

Nov 17th 2023

A new bathtub is a popular bathroom renovation because it can make the space more beautiful and functional. Installing a bathtub involves meticulous attention to detail. Throughout the installation, inspecting the subfloor and flooring, ensuring a watertight seal, and preventing mold growth and leaks are important for a good finished product. 

One critical part of this process is using silicone sealant to create a durable and waterproof barrier between the tub, walls, and floor. The right silicone sealant will prevent water seepage, combat mold, and mildew, and preserve the integrity of the installation.

Proper silicone sealant application around the bathtub's edge can make or break your bathtub installation. Here’s everything you need to know for a stress-free bathtub installation with silicone sealant.

1. Preparing for the Installation

Before diving into the installation process, thorough preparation is key to ensure a smooth and successful bathtub upgrade. Start by turning off the water supply to the bathroom, which is a critical step in creating a safe working environment. This precaution prevents potential water-related mishaps during installation and allows for a more controlled and manageable workspace.

Once you have turned off the water supply, the next step involves safely removing the old bathtub. Follow proper procedures and disposal guidelines to minimize environmental impact and adhere to regulations. This initial phase sets the stage for a fresh installation, laying the groundwork for a water-resistant and mold-free bathing space.

Meticulously inspect the following and subfloor for any signs of water damage or mold growth. Identifying and addressing these issues beforehand is crucial for the long-term integrity of the installation. If left unattended, mold or mildew growing beneath a bathtub can cause health issues and moisture problems. If you see any signs of water damage or mold growing, you must fix these underlying issues before installing the bathtub.

These precautions and a vigilant inspection process form the foundation for a successful installation. While it’s a lot to manage, it prioritizes the bathroom space's structural soundness and prevents health problems.

2. Choosing the Right Silicone Sealant

Selecting the right silicone sealant is crucial for a bathtub installation that withstands the test of time. Opt for a high-quality silicone sealant that boasts mold- and water-resistant properties to ensure this installation lasts. You may also want to consider whether it is heat-resistant, as many consumers like piping-hot baths and showers. Investing in top-notch silicone materials prevents water damage and minimizes future maintenance needs.

For specific recommendations, consider renowned silicone products that excel in bathtub installations. Silicone Depot offers a variety of silicone sealants, including several that are heatproof and moisture-resistant. Our products endure the challenges of bathroom environments, ensuring the seal stays secure through the rigors of daily use.

Before applying the silicone, remove the tub and install the tube around the edges, faucet, and fixtures. This meticulous application process, coupled with the use of quality silicone sealants, guarantees a watertight seal. A strong seal enhances the bathtub's aesthetic appeal and protects against future water-related issues.

3. Applying the Silicone Sealant

When applying silicone sealant for your bathtub installation, the technique is crucial for achieving a durable and watertight seal. Utilize a caulking gun to dispense the silicone evenly along the edges and seams of the bathtub. Hold the gun at a 45-degree angle and apply consistent pressure to ensure a uniform bead of sealant. This technique guarantees thorough coverage and promotes adhesion, creating a robust barrier against water infiltration.

Pay special attention to areas around plumbing fixtures, using plumbing silicone products as needed. Proper application prevents leaks and the intrusion of mold spores that could lead to mold growth over time.

Beyond functional aspects, proper silicone application can provide many benefits for your client’s bathtub experience. Ensuring a smooth surface during application facilitates easy cleaning and prevents mold and mildew growth. It also ensures that the visual appeal of the new bathtub is top-notch.

You may need additional tools to achieve a neat and professional finish. Some contractors use masking tape along edges to maintain clean lines and a caulking tool to smooth the applied silicone. These measures contribute to a polished and well-executed installation.

4. Preventing Leaks and Water Damage

Incorrect application of silicone sealant during bathtub installation poses risks, including leaks and water damage. When the sealant is not applied correctly, water can seep through the gaps and reach the subfloor. Subfloor water damage can lead to potentially costly repairs if not caught immediately. A proper seal is vital to prevent water from infiltrating the underlying structures.

Regular inspection of the silicone sealant is paramount to ensuring its ongoing effectiveness. Over time, the sealant may deteriorate or develop gaps, compromising its ability to create a watertight barrier.

Homeowners can proactively mitigate the risk of leaks by promptly identifying and addressing any signs of wear or damage. While repairs may be inconvenient, they’re much better than the expenses and potential health hazards of mold and mildew growth. You may want to explain what to look for to your clients so they know when to contact you to repair any future damage.

5. Cleaning and Maintenance

To ensure the longevity of your bathtub installation and thwart mold and mildew growth, encourage proactive silicone seal cleaning. We recommend sharing the importance of regularly cleaning the sealant using a mildew-resistant cleaner and a soft cloth or sponge with your client. This simple practice helps remove any accumulated moisture or residue that could foster mold problems.

Promptly addressing signs of deterioration or damage is equally crucial. If any gaps or cracks appear, even if they seem mild, the homeowner should notify you immediately and have you repair them. This preserves the bathroom's aesthetic appeal and the sealant’s effectiveness in preventing water damage, structural damage, and health hazards.


Correctly installing a new bathtub and choosing the right silicone sealant can help prevent leaks, mold, and mildew growth. By choosing high-quality silicone sealant and applying it meticulously, contractors can ensure a successful installation and durable, watertight seal.

Because of the risks of an incorrectly installed bathtub, it’s important to make sure you have the right tools and supplies. From caulking guns to the perfect silicone for your next project, Silicone Depot is here to help. Browse our extensive line of silicone sealants today to find the perfect silicone for every task.