What issue is indicative of poor bonding in tile installations?

The presence of failed bonding in tile installations is a clear indicator of poor bonding. This situation occurs when the adhesive does not properly adhere tiles to the substrate, which can lead to weak connections between the tiles and the surface they are installed on. When tiles fail to bond effectively, they may become loose or entirely detach, compromising the integrity of the installation.

In tile work, adequate bonding is essential for ensuring that tiles remain securely in place and can withstand the stresses of foot traffic, temperature variations, and moisture exposure. When bonding fails, it typically results in tiles that do not have a solid connection to the underlying surface, making them more susceptible to damage.

While discoloration, shifting tiles, and cracks can also be associated with tile installations, they do not specifically indicate the bonding failure itself. Discoloration may be related to issues with the tile material or grouting, shifting tiles may stem from various structural movements or inadequate fastening, and cracks can result from multiple causes, including thermal expansion or improper installation techniques. Thus, while all these issues can arise in a tile installation, failed bonding is the primary concern that directly points to inadequate adherence of the tiles.