In which type of installation would you typically use "thin-set mortar"?

Thin-set mortar is a widely used adhesive specifically designed for adhering tiles to a substrate, primarily in interior installations. This type of mortar is known for its versatility and ease of use, making it a popular choice among tile installers. It is applied in a thin layer, allowing for a strong bond between the tile and the substrate while minimizing the height of the tile installation.

While thin-set mortar can also be used in outdoor applications, it typically requires specific formulations to resist moisture and temperature changes. Therefore, the use of thin-set in outdoor settings is not exclusive and depends on specific conditions and requirements.

Moreover, thin-set mortar is not restricted to wall installations, as it is equally effective for floor tile applications. Specialty tiles might require specific installation processes or adhesives, depending on their material and size, but thin-set mortar remains a foundational option for standard tile installations in various scenarios. This versatility and suitability for interior environments solidify the choice for using thin-set mortar, highlighting why it is the correct answer.