Red Seal Tilesetter Practice Exam

What is the primary purpose of back buttering tiles?

1. To create a decorative effect

2. To ensure full contact and increase adhesion

3. To speed up the installation process

4. To assess the quality of tiles

The correct answer is: To ensure full contact and increase adhesion

Back buttering tiles is primarily done to ensure full contact between the tile and the adhesive, which significantly increases the adhesion between the two surfaces. This technique involves applying a uniform layer of thin-set mortar or adhesive on the back of the tile before placing it on the substrate. The practice helps fill any voids or irregularities on the tile's back, leading to a more secure bond once the tile is set. Achieving full contact minimizes the risk of air pockets, which can lead to issues such as cracking, lifting, or moisture damage over time. This method is particularly important for large format tiles or those with uneven backs. By ensuring maximum coverage, back buttering enhances the durability and longevity of the tile installation, making it critical for a successful outcome.