Can You Lay Tile On Osb Subfloor

Can You Lay Tile On OSB Subfloor?

Oriented Strand Board (OSB) is a popular subflooring material for its strength and affordability. However, it is not as moisture-resistant as other subflooring options, which raises the question: can you lay tile on OSB subfloor?

The answer is yes, but it requires proper preparation and precautions to ensure the longevity and performance of the tile installation:

1. Moisture Control:

OSB is susceptible to moisture absorption, which can lead to swelling and warping of the subfloor, compromising the integrity of the tile installation. To prevent this, install a moisture barrier between the OSB and the tile:

Plastic sheeting: Lay a 6-mil plastic sheeting over the OSB, overlapping the edges by 6 inches.
Liquid moisture barrier: Apply a liquid moisture barrier specifically designed for OSB subfloors.

2. Leveling the Subfloor:

OSB may not always be perfectly level, which can create unevenness in the tile installation. To ensure a flat surface, consider using:

Self-leveling compound: Pour a self-leveling compound over the OSB and allow it to spread and self-level, creating a smooth surface.
Backer board: Install a cement backer board over the OSB, providing a more stable and level surface for tiling.

3. Tile Underlayment:

Tile underlayment, such as ditra matting or decoupling membrane, can help absorb movement and prevent cracking in the tile installation. Install the underlayment according to the manufacturer's instructions.

4. Thin-Set Mortar:

Use a thin-set mortar specifically designed for OSB subfloors. This type of mortar has a higher bond strength and will adhere well to the OSB, ensuring a lasting installation.

5. Grouting:

When grouting the tiles, use a sanded grout that is designed for floor applications. The sanded texture will help prevent cracking and add durability to the grout.

By following these steps, you can successfully lay tile on OSB subfloor and enjoy a beautiful and lasting tile installation. Remember, proper preparation and precautions are crucial to ensure the integrity and longevity of your tile work.