Chloe Zhang
Whether or not a Delta plastic tub needs mortar depends on the type of tub and the surface it is being installed on. While some plastic tubs have an integrated base that sits flat on the floor and do not require mortar, others may benefit from a thin layer of mortar to ensure a solid and secure installation, especially if the floor is not perfectly flat or level. Some installers recommend using mortar to prevent the tub from shifting horizontally and to provide additional support, while others suggest alternatives like gluing the feet or using sand. Ultimately, it is essential to refer to the installation instructions and seek professional advice to determine the best course of action for your specific Delta plastic tub.
Does a Delta Plastic Tub Need Mortar?
| Characteristics | Values |
|---|---|
| Necessity of mortar for Delta plastic tubs | Not strictly necessary but can be used for added support and to prevent movement and cracking |
| Alternative to mortar | Sand |
| Other materials that can be used for support | Cement, grout, construction adhesive, silicone |
| Materials to avoid | Glob of mortar around the drain |
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What You'll Learn
Delta Classic 400 installation instructions state that mortar is unnecessary
The Delta Classic 400 installation instructions state that mortar is unnecessary. However, some people still choose to use it, believing that it provides extra support and prevents future damage.
The Delta Classic 400 is an acrylic tub with a plastic "honeycomb" matrix on the bottom. The instructions for this tub specify that no mortar is needed for installation. This is likely because the tub has an integrated base, designed to sit flat on the floor, which provides stability without the need for mortar.
Despite the instructions, some people choose to install the Delta Classic 400 with mortar, especially around the drain area. They argue that any extra support is beneficial, and the presence of a hole in the floor where the drain is located makes full support of the tub challenging.
Additionally, those who have experienced tub failure believe that using mortar can help prevent future issues. They suggest that without mortar, the tub may move and feel "cheap," leading to fatigue cracking and leaks over time.
However, it is important to consider the potential challenges of using mortar with this particular tub. As mentioned in the instructions, a mortar bed would need to be thick, requiring multiple layers or non-shrink grout. This could result in interference or damage if the product is specifically designed to function without it.
Therefore, while the Delta Classic 400 installation instructions state that mortar is unnecessary, some installers may choose to use it based on their own experiences and beliefs about providing extra support and preventing potential issues.
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Mortar may be needed if the floor is uneven
A Delta plastic tub may not require mortar for installation. However, if your floor is uneven, you may need to use mortar to level the surface and ensure a stable base for the tub.
The need for mortar depends on the specific characteristics of your floor and the type of tub you have chosen. Some tubs have an integrated base or a built-in wedge that sits flat on the floor, eliminating the need for a mortar bed. However, if your floor is uneven or not perfectly level, you may need to use mortar to create a stable and solid foundation for your tub.
Using mortar can provide several benefits. Firstly, it helps to prevent the tub from shifting horizontally after installation, reducing the risk of fatigue cracking and potential leaks over time. Secondly, mortar creates a solid and secure installation, enhancing the overall stability of the tub. This is especially important for heavier tubs, as the weight of the filled tub can exert significant pressure on the floor.
If you decide to use mortar, it is recommended to follow the manufacturer's instructions carefully. Some tubs may suggest alternative methods, such as gluing the feet or using construction adhesive, silicone, or grout. Additionally, consider using plastic sheeting between the mortar and the tub to facilitate easier removal in the future.
In summary, while a Delta plastic tub may not always require mortar, it can be beneficial, especially if your floor is uneven. Mortar provides stability, prevents horizontal shifting, and reduces the chances of cracking and leaks. Always refer to the installation instructions and seek professional advice if needed to ensure a safe and durable installation.
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Some tubs have a built-in base, eliminating the need for mortar
It is not always necessary to use mortar with a bathtub. Smaller tubs, in particular, often don't require mortar. Some larger tubs have a self-levelling system, with feet that keep the tub stable and supported. Certain tubs are designed to not need any support, but this does depend on the floor being perfectly level.
Some bathtubs have a built-in base, meaning they don't require mortar. If the floor is not flat, however, you may need to level it before installing the tub. This can be done with a levelling compound or by shimming.
If you're installing a Delta Classic 400, for example, you may be able to install it without mortar. However, some users have reported issues with this method and recommend using mortar for a more secure fit.
If you do need to use mortar, there are several options. Thinset is one option, but it dries quickly and is less forgiving, so it's not ideal for this purpose. Ready-mix concrete is a better choice, as it's affordable and easy to use. Grout or gypcrete are also good options, as they're cheap and easy to work with. Be sure to follow the manufacturer's recommendations for your specific tub.
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The use of mortar provides a secure installation
One of the main benefits of using mortar is to prevent movement. If a tub is not properly secured, it may shift horizontally, leading to a "cheap" feel when standing in it. Over time, this movement can cause fatigue cracking, which will eventually lead to leaks. By using mortar, you can create a solid foundation that will keep the tub firmly in place and prevent these issues.
Additionally, mortar can help to level and stabilise the tub. Most floors are not perfectly flat or level, and even a tub with a support system may not be completely flat itself. By applying a thin bed of mortar, you can fill any gaps and create a level surface for the tub to sit on. This ensures that the weight of the tub, especially when filled with water, is distributed evenly, reducing the risk of cracking or other damage.
Some people choose to use plastic sheeting between the mortar and the tub. This helps to ensure that the tub is not permanently stuck to the mortar, making it easier to remove or adjust if needed. It also allows for some flexibility, which can be beneficial in certain situations.
While it is possible to install a Delta plastic tub without mortar, using mortar can provide additional support and stability, reducing the risk of long-term damage and creating a more secure and solid installation.
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Some prefer gluing the feet instead of using mortar
While some bathtubs require mortar for support, others do not. Smaller tubs, for instance, often don't require mortar, and larger tubs sometimes have a self-levelling system built-in, where little feet all the way under the tub keep it stable and supported. Some tubs are designed to not need support of any kind, but these presuppose that the floor is perfectly level.
If your bathtub does require mortar, then it's important to follow the manufacturer's recommendations. However, some people prefer gluing the feet instead of using mortar. This can be done by shimming the feet and securing the shims using construction adhesive, silicone, or an equivalent material. While this method may not provide the same level of support as mortar, it can be a good option if you are looking for a quicker or more affordable installation.
It is worth noting that bathtubs with glued feet may feel less sturdy and are more likely to shift horizontally after installation. This can lead to fatigue cracking and leaks over time. Additionally, if you choose to glue the feet of your bathtub, it is important to ensure that the floor is level and that the tub is not resting on the front apron framing, as this can affect the stability of the tub.
When gluing the feet of a bathtub, it is recommended to use construction adhesive or silicone. You can also use a product like PL glue, which is known for its strong bonding properties. It is important to follow the instructions on the product you choose and apply it correctly to ensure a secure installation.
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Frequently asked questions
While it is not necessary, a foundation base of mortar, cement, or grout will help provide a solid and secure installation. It will also prevent the tub from shifting horizontally after installation.
You can use construction adhesive or silicone to secure the shims. You can also use sand to support the tub instead of mortar.
Using mortar will help prevent fatigue cracking and leaks. It will also make the tub feel more solid when you use it.
