What is the main purpose of grout in tile installations?

Grout plays a crucial role in tile installations, primarily serving to fill the gaps between tiles. This function is essential for several reasons. First, grout helps to stabilize the tiles and prevent movement, which can lead to chipping or breaking. By filling in the spaces, it provides structural integrity to the overall surface, ensuring that the tiles remain securely in place over time. Additionally, grout acts as a barrier against moisture, which can prevent water seepage under the tiles and reduce the risk of damage to the substrate or mold growth.

While some types of grout may add color or texture to the finished appearance, the fundamental purpose is primarily related to filling gaps and enhancing the durability of the installation. Other choices suggest functionalities that are either secondary effects or not aligned with the primary role of grout in maintaining the structure and appearance of tiled surfaces.