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Using the wrong type of grout can lead to cracking and discoloration, which are common issues that arise when the proper materials are not utilized. Different types of grout are formulated for specific environments and tile materials; for example, sanded grout is typically used for larger joints, while unsanded grout is better for smaller joints. Using a grout that is not suited to the tile or the environment — such as using a non-waterproof grout in areas exposed to moisture — can compromise the integrity of the installation.

Cracking can occur due to the grout failing to expand and contract properly with temperature changes or movement, leading to a breakdown of the material over time. Discoloration can result from the wrong color or type of grout not bonding well with the surrounding tiles or reacting unfavorably with environmental conditions, such as moisture or sunlight.

Understanding the properties and appropriate applications of different grout types allows tilesetters to avoid these issues, ensuring a durable and aesthetically pleasing installation.