Tile on Concrete – Do You Need Underlayment?

Tile is a popular flooring option that many homeowners choose for its durability and versatility. When installing tile onto a concrete subfloor, the question of whether or not to use underlayment arises. Some may think that the concrete subfloor is enough, while others insist on using underlayment. So, do you need underlayment for tile on concrete? Let’s dive into the details.

Before we answer that question, let’s first understand what underlayment is and why it’s used. Underlayment is a thin layer of material that is placed between the subfloor and the tile. It serves as a cushion, a moisture barrier, and a sound reducer. Underlayment can be made of various materials such as cement board, foam, or rubber. Now, let’s explore the factors that determine whether or not you need underlayment for tile on concrete.

The Condition of the Concrete Subfloor

The first factor to consider is the condition of the concrete subfloor. If the concrete is smooth, level, and free of cracks and imperfections, you may not need underlayment. The tile can be installed directly onto the concrete with a thinset mortar. However, if the concrete is uneven or has cracks, underlayment is necessary. The underlayment will provide a level surface for the tile and prevent it from cracking or breaking over time.

The Type of Tile

The type of tile you are installing also plays a role in whether or not you need underlayment. Large format tiles, such as 12×24 or 24×24, require a flat and level surface. If the concrete subfloor is not level, underlayment is necessary to create a smooth surface for the large format tiles. On the other hand, smaller tiles, such as mosaics, can be installed directly onto the concrete without underlayment, as they can conform to the uneven surface.

The Room’s Moisture Level

The moisture level of the room where the tile is being installed is another factor to consider. If the room has high moisture levels, such as a bathroom or laundry room, underlayment is necessary to prevent the moisture from seeping into the tile and causing damage over time. The underlayment will serve as a moisture barrier and protect the tile from water damage.

The Sound Reduction Needs

If sound reduction is a concern, underlayment can be used to reduce the impact noise between floors. This is especially important in high-rise buildings or multi-level homes where sound travels easily. Foam or rubber underlayment can help reduce the sound transmission and provide a quieter environment.

The Cost and Time Factor

Finally, the cost and time factor is also important to consider. Underlayment can add an extra cost to the tile installation project, as well as extra time for installation. However, if the condition of the concrete subfloor requires underlayment, it’s a necessary investment to ensure the longevity and durability of the tile floor.

Conclusion

So, do you need underlayment for tile on concrete? The answer is: it depends. It depends on the condition of the concrete subfloor, the type of tile, the moisture level of the room, the sound reduction needs, and the cost and time factor. Consulting with a professional tile installer can help determine whether or not underlayment is necessary for your tile installation project.

Ultimately, underlayment can provide a smoother surface, a moisture barrier, sound reduction, and added durability to your tile floor. It’s worth considering as an investment in your home’s value and longevity.