Which of the following can be a consequence of improper tile installation?

Improper tile installation can lead to tile slippage, which occurs when the tiles fail to adhere properly to the substrate. This can happen for a variety of reasons, such as inadequate adhesive application, poor surface preparation, or incorrect installation techniques. When tiles slip, they can create uneven surfaces, gaps, or even detach completely from the floor or wall, compromising not only the aesthetic appeal but also the functionality and safety of the installation.

The other options suggest positive outcomes—enhanced durability, better aesthetics, or a longer lifespan—which are typical goals of proper tile installation rather than consequences of mistakes made during the process. Therefore, the recognition of tile slippage as a consequence emphasizes the importance of proper installation techniques to ensure long-lasting and visually pleasing results.