Best Tile Floor Underlayment Options | How to use them

Installing a tile floor requires careful consideration of the materials used beneath the tiles. Underlayment serves as a crucial layer that provides stability, support, and protection for your tiles. Choosing the right underlayment can significantly impact the longevity and durability of your tile floor. In this guide, we’ll explore the best tile floor underlayment options available and the best practices for their usage.

Importance of Underlayment:

Before delving into the various underlayment options, let’s understand why it’s vital for your tile flooring project:

  • Support and Stability: Underlayment provides a stable base for your tiles, preventing cracks and damage caused by movement.
  • Moisture Protection: Certain underlayment materials offer moisture resistance, crucial for areas prone to dampness or moisture.
  • Sound Reduction: Underlayment can help reduce noise transmission, making your floor quieter and more comfortable.
  • Leveling: It helps to create a level surface, especially when dealing with uneven subfloors.

Best Tile Floor Underlayment Options:

1. Cement Backer Board:

Usage: Cement backer boards like HardieBacker and WonderBoard are popular choices for tile installations, especially in wet areas like bathrooms and kitchens.


  • Moisture Resistance: Cement boards are excellent at resisting moisture, making them ideal for high-moisture areas.
  • Stability: They provide a solid and stable base for tiles, reducing the risk of cracks.

How to Use: Install the boards over the subfloor using thin-set mortar and screws, ensuring a stable and level surface for tile installation.

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2. Uncoupling Membranes:

Usage: Uncoupling membranes like Schluter Ditra and Laticrete StrataMat are designed to separate the tile layer from the subfloor, reducing the risk of cracks caused by movement.


  • Crack Isolation: These membranes absorb movement, preventing cracks from transferring to the tiles.
  • Waterproofing: Some membranes offer waterproofing capabilities, safeguarding against moisture damage.

How to Use: Roll out the membrane over the subfloor and adhere it using a suitable adhesive, providing a stable base for tile installation.

3. Cork Underlayment:

Usage: Cork underlayment is known for its natural insulation and sound-dampening properties, making it an excellent choice for reducing noise in living areas.


  • Sound Reduction: Cork effectively reduces impact noise, creating a quieter environment.
  • Eco-Friendly: It’s a renewable and sustainable material, appealing to environmentally conscious consumers.

How to Use: Lay the cork sheets over the subfloor, ensuring seams are properly sealed, and then install tiles on top.

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4. Plywood and OSB:

Usage: Plywood and Oriented Strand Board (OSB) are common subfloor materials used in tile installations.


  • Affordability: Plywood and OSB are cost-effective options for creating a smooth and level base.
  • Versatility: They can be used in various settings, provided they are properly prepared and supported.

How to Use: Install plywood or OSB sheets over the subfloor, ensuring they are adequately supported and screwed down before tiling.

5. Rubber Underlayment:

Usage: Rubber underlayment is excellent for impact sound reduction and is often used in high-rise buildings or areas where noise transmission is a concern.


  • Noise Reduction: Rubber effectively reduces both impact and airborne noise, enhancing living comfort.
  • Durability: It offers excellent durability and can withstand heavy foot traffic.

How to Use: Roll out the rubber underlayment over the subfloor, ensuring seams are properly sealed before installing tiles.

How to Choose the Right Underlayment:

When selecting the best underlayment for your tile flooring project, consider these factors:

  • Subfloor Condition: Assess the condition of your subfloor. Is it level, smooth, and free from moisture?
  • Room Usage: Determine the room’s purpose. High-moisture areas like bathrooms may require moisture-resistant underlayment.
  • Sound Considerations: If noise reduction is a concern, opt for underlayment materials with sound-dampening properties.
  • Budget and Preferences: Consider your budget and preferences regarding eco-friendliness or specific material requirements.
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Installation Tips:

Regardless of the underlayment chosen, follow these installation tips for a successful tile floor:

  1. Prepare the Subfloor: Ensure the subfloor is clean, level, and free from debris before installing any underlayment.
  2. Follow Manufacturer’s Guidelines: Adhere strictly to the manufacturer’s instructions for installing the underlayment material.
  3. Seam and Edge Treatment: Properly seal seams and edges to prevent moisture infiltration and ensure stability.
  4. Allow for Drying Time: If using adhesives or thin-set mortar, allow sufficient drying time before laying tiles.


What is tile floor underlayment, and why is it important?

  • Underlayment refers to the layer placed between the subfloor and the tile surface. It’s crucial as it provides stability, support, and protection for the tiles, ensuring longevity and preventing damage.

Do I need underlayment for my tile floor?

  • Yes, in most cases. Underlayment helps create a stable base, prevents cracks, reduces noise, and offers moisture protection, especially in areas prone to dampness.

Can I install tiles directly onto plywood or OSB?

  • Yes, but it’s recommended to use a suitable underlayment material over plywood or OSB to create a more stable and durable base for the tiles.

How do I choose the right underlayment for my tile floor?

  • Consider factors like the subfloor condition, room usage, sound considerations, budget, and manufacturer guidelines to select the most suitable underlayment.

What are some common mistakes to avoid during underlayment installation?

  • Ignoring Subfloor Preparation: Failing to properly clean and prepare the subfloor.
  • Neglecting Manufacturer’s Instructions: Not following the recommended installation methods specified by the underlayment manufacturer.
  • Improper Seam and Edge Treatment: Inadequate sealing of seams and edges can lead to moisture issues.


Choosing the right underlayment is crucial for the success and longevity of your tile flooring project. Consider the specific needs of your space, the properties of different underlayment materials, and follow proper installation techniques to achieve a durable and beautiful tile floor.

By understanding the various underlayment options available and their applications, you can make an informed decision and create a sturdy foundation for your tile flooring, ensuring both functionality and aesthetic appeal.

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