Which Side Of Cement Board Does Tile Go On Top

Which Side Of Cement Board Does Tile Go On Top?

Cement board is a popular backer board for tile installations due to its strength, durability, and moisture resistance. However, it is important to know which side of the cement board the tile should be installed on to ensure a successful and long-lasting installation.

Smooth Side vs. Rough Side

Cement board typically has two distinct sides: a smooth side and a rough side. The smooth side is the side that is sanded to provide a flat surface for the tile to adhere to. The rough side has a texture to help the thinset mortar bond to the board.

Which Side Goes Up?

The smooth side of the cement board should always face up, towards the tile. The rough side should face down, towards the wall or subfloor. This is because the smooth side provides a better bonding surface for the tile. The rough side helps to anchor the cement board to the substrate.

Benefits of Installing Tile on the Smooth Side

There are several benefits to installing tile on the smooth side of the cement board:

Improved adhesion: The smooth surface provides a better bond for the thinset mortar, resulting in a stronger installation.
Reduced slippage: The smooth side prevents the tile from sliding or shifting during installation, ensuring a more stable and level surface.
Enhanced grout adhesion: The smooth surface creates a tighter bond with the grout, preventing it from cracking or chipping.

Consequences of Installing Tile on the Rough Side

Attempting to install tile on the rough side of the cement board can lead to several problems:

Poor adhesion: The rough texture of the board makes it difficult for the thinset mortar to adhere properly, resulting in a weak bond.
Tile slippage: The rough surface can cause the tile to slip or move during installation, leading to uneven or unstable tiles.
Grout failure: The rough surface can prevent the grout from forming a tight bond, leading to cracks or chipping.

Exceptions

In certain situations, it may be necessary to install tile on the rough side of the cement board. For example, if the tiles are very thin or have a textured surface, the rough side may provide a better mechanical bond. However, it is important to note that these exceptions should be carefully considered and may require additional precautions.

Conclusion

When installing tile on cement board, it is crucial to always place the tile on the smooth side of the board. This will ensure a strong bond, prevent slippage, and enhance the overall performance and durability of the tile installation.