What is thin-set mortar primarily used for?

Thin-set mortar is primarily used to bond tiles to the substrate, which is crucial for ensuring a strong and durable installation. It is a specially formulated adhesive that provides the necessary grip to secure various types of tiles, such as ceramic, porcelain, and natural stone, to surfaces like concrete, cement board, or drywall. The composition of thin-set mortar allows it to conform well to the uneven surfaces of both tiles and substrates, creating a solid mechanical bond that can withstand environmental stresses, such as moisture and temperature changes.

Using thin-set mortar correctly is essential because it influences the longevity and performance of the tiled surface. The adhesive properties of thin-set allow for a solid layer that distributes weight evenly, prevents movement between tiles, and inhibits the potential for cracks. Proper application techniques, including trowel size, slanting, and back-buttering tiles when necessary, are key factors in achieving optimal adhesion.

Other options, while relevant to tile installation, do not define the primary function of thin-set mortar. Filling gaps or sealing surfaces pertains to different materials or products, like grout or sealants, and creating a leveling base is typically accomplished using other types of mortar or self-leveling compounds rather than thin-set. Thus, the primary purpose of thin-set mortar remains