Why No Concrete Under Bathtub?: Avoiding Common Problems

Placing concrete under a bathtub is not necessary unless the tub requires additional support. Some tubs, especially those on the floor or stiff enough, do not need concrete.

However, if the tub is flexible, mortar may be used to prevent movement. The absence of concrete creates a space where rodents and insects can crawl through and enter your home. Therefore, proper support should be considered during bathtub installation to avoid potential problems.

When installing a bathtub, the question of whether or not to use concrete underneath often arises. While concrete provides stability and support, it is not always necessary. In many cases, tubs do not require concrete if they are on the floor or are sufficiently stiff. However, if the tub has some flexibility, mortar may be used to prevent movement. Although the absence of concrete may create a space for rodents and insects to crawl through, proper installation and support can mitigate this risk. Therefore, it is important to consider the specific requirements of your bathtub installation to ensure a long-lasting and problem-free solution.

Potential Problems With Using Concrete Under Bathtub

When it comes to installing a bathtub, using concrete as a base may seem like a viable option. However, there are several potential problems that can arise from using this method. It’s important to understand these issues before making a decision. In this article, we will discuss the potential problems associated with using concrete under a bathtub.

Increased risk of cracks and leaks

Using concrete as a base for a bathtub can increase the risk of cracks and leaks. Concrete is a rigid material that does not have much flexibility. When a heavy bathtub is placed on top of it, the concrete may not be able to withstand the weight and may crack under pressure. These cracks can then lead to water leaks, causing damage to the surrounding area. Additionally, if the concrete base shifts or settles over time, it can create gaps between the tub and the floor, further increasing the risk of leaks.

Difficulty in repairing or replacing the bathtub

Another potential problem with using concrete under a bathtub is the difficulty in repairing or replacing the tub. If there are any issues with the tub, such as cracks or leaks, accessing and repairing them becomes challenging when the tub is installed on a concrete base. Unlike other types of flooring or bases, where the tub can be easily lifted or removed, removing a tub from a concrete base requires a lot of effort and may even result in damage to the tub or the surrounding area.

Limited access to plumbing connections

Using concrete under a bathtub can also limit access to plumbing connections. In case of any plumbing issues or repairs, it becomes difficult to access the connections when the tub is installed on a concrete base. This can lead to increased labor costs and time-consuming procedures, as plumbers would have to work around the concrete to perform any necessary repairs or maintenance.

Uneven weight distribution leading to structural issues

One more potential problem with using concrete under a bathtub is the uneven weight distribution it can cause, leading to structural issues. Concrete is not a flexible material, and if the weight of the bathtub is not evenly distributed, it can put excessive pressure on certain areas of the concrete base. This can result in structural issues such as sagging or even collapse of the base, leading to a hazardous situation.

In conclusion, while using concrete as a base for a bathtub may seem like a sturdy option, it comes with potential problems that can lead to cracks, leaks, difficulties in repair or replacement, limited access to plumbing connections, and uneven weight distribution causing structural issues. It is important to consider these factors before making a decision, and it is recommended to explore alternative options that provide better support and flexibility for the bathtub installation.

Alternative Support Methods That Are Preferred

Use of adjustable bathtub support systems

One alternative support method for bathtubs that is preferred over concrete is the use of adjustable bathtub support systems. These systems consist of adjustable legs or feet that can be adjusted to provide the necessary support and stability for the bathtub.

By using adjustable support systems, you can easily level the bathtub and ensure that it is properly supported, preventing any potential damage caused by uneven surfaces. These systems also allow for easy access to plumbing and drainage systems, making any necessary repairs or maintenance a breeze.

Metal support frames or brackets

Another preferred alternative to concrete support is the use of metal support frames or brackets. These frames or brackets are specifically designed to provide the necessary support and stability for the bathtub without the need for concrete.

They are typically made from durable and corrosion-resistant materials such as stainless steel or aluminum, ensuring long-lasting support for the bathtub. Additionally, metal support frames or brackets can be easily adjusted and installed, making them a convenient option for bathtub installation.

Installation of support boards or platforms

Support boards or platforms are another alternative method that is preferred over concrete support. These boards or platforms are installed underneath the bathtub to provide additional support and stability.

They can be made from various materials such as plywood or composite boards, and offer flexibility in terms of size and shape to fit different bathtub designs. Installing support boards or platforms not only ensures proper support for the bathtub but also helps distribute the weight evenly, reducing the risk of structural damage.

In conclusion, there are several alternative support methods that are preferred over concrete when it comes to installing bathtubs. Adjustable bathtub support systems, metal support frames or brackets, and installation of support boards or platforms offer more flexibility, convenience, and stability for bathtub installations. By choosing these alternative support methods, you can ensure that your bathtub is properly supported and avoid any potential problems associated with concrete support.

Factors To Consider When Choosing Bathtub Support Method

Type of Bathtub Material

When it comes to choosing the right support method for your bathtub, one important factor to consider is the type of bathtub material. Different materials, such as acrylic, cast iron, and fiberglass, have varying strengths and requirements for support.

Size and Weight of the Bathtub

Another crucial factor to consider is the size and weight of the bathtub. Larger and heavier bathtubs require more stable support to prevent any potential damages or accidents. It’s important to choose a support method that can handle the specific dimensions and weight of your bathtub.

Location of Existing Plumbing Connections

The location of existing plumbing connections in your bathroom is also an essential factor to consider when choosing a bathtub support method. You want to ensure that the support method allows easy access to the plumbing connections for maintenance or repairs in the future. Overall, when selecting a support method for your bathtub, it’s important to take into account the type of bathtub material, the size and weight of the bathtub, and the location of existing plumbing connections. By considering these factors, you can ensure proper support and longevity for your bathtub.

Importance Of Professional Installation For Bathtubs

Importance of Professional Installation for Bathtubs

Installing a bathtub may seem like a straightforward task, but it’s crucial to ensure that it is done professionally. The installation process plays a significant role in the longevity and functionality of your bathtub. When it comes to installing bathtubs, there are several important factors to consider. In this section, we will explore the importance of professional installation for bathtubs and why you should avoid using concrete under your bathtub.

Ensuring Proper Alignment and Support of the Bathtub

Proper alignment and support of a bathtub are essential to ensure its stability and structural integrity. When bathtubs are not correctly aligned and supported, they may shift or sink over time, causing potential problems such as leaks, cracks, or uneven surfaces. Professional installation involves precise measurements and adjustments to ensure that the bathtub is aligned correctly and appropriately supported.

Preventing Potential Problems and Costly Repairs in the Future

Poorly installed bathtubs can lead to a range of problems down the line. These issues may include water leakage, mold growth, and damage to the surrounding flooring and walls. By opting for professional installation, you can prevent these problems from occurring and save yourself from costly repairs in the future. Professional bathtub installers have the expertise to identify potential issues and address them proactively during the installation process.

Warranty Implications of Improper Installation

Improper installation of a bathtub can also have significant warranty implications. Many bathtub manufacturers require professional installation to maintain the validity of the product warranty. If you attempt to install the bathtub yourself or use improper installation methods, you may void the warranty. By relying on professional installers, you can ensure that your bathtub is installed correctly and maintain the warranty coverage for any potential future repairs or replacements.

In conclusion, professional installation plays a vital role in ensuring the proper alignment, support, and functionality of your bathtub. It helps prevent potential problems, costly repairs, and maintains the validity of the warranty. Avoid using concrete under your bathtub and trust the expertise of professional installers to ensure a long-lasting and trouble-free bathing experience.

Frequently Asked Questions For Why No Concrete Under Bathtub

Should I Put Cement Under My Bathtub?

No, it is not necessary to put cement under your bathtub. Some tubs do not need support and if the tub is stiff enough, it is not needed. Mortar is only used when there is flexibility.

Should You Put Flooring Under Bathtub?

No, it is not necessary to put flooring under a bathtub. If the flooring is installed before the bathtub, it can lead to scratching or damaging the floor when positioning the heavy bathtub. It is more convenient to install the bathtub first and then add the flooring and walling.

What Should I Put Under My Bathtub?

No, it is not necessary to put concrete under your bathtub. If the tub is on the floor and stiff enough, it doesn’t need support. Mortar is sometimes used when there is flex. There may be a hole in the concrete under the bathtub for plumbing convenience.

The absence of concrete can allow rodents and insects to crawl through.


To recap, the use of concrete under a bathtub is not always necessary. If the tub is on the floor and sturdy enough, it can be installed without additional support. Mortar may be used in cases where there is flexibility in the tub.

However, it is important to consider that the absence of concrete can create openings for insects and rodents to crawl through. Ultimately, the decision to use concrete should be based on the specific requirements of the bathtub installation.

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