Red Seal Tilesetter Practice Exam

Name a key characteristic of type 1 thin-set mortar.

1. High adhesion and flexibility

2. Flexibility and moisture resistance

3. Low cure time and high strength

4. Only applicable for floors

The correct answer is: Flexibility and moisture resistance

Type 1 thin-set mortar is primarily characterized by its flexibility and moisture resistance, making it suitable for various applications, including both floor and wall installations. This flexibility allows it to accommodate slight movements in the substrate or the tile without cracking, which is particularly important in areas that experience temperature fluctuations or slight structural shifts. The moisture resistance feature ensures that the mortar can withstand exposure to water, making it ideal for damp environments, such as bathrooms and kitchens. The other options do not accurately capture the essence of Type 1 thin-set mortar. While high adhesion is a necessary quality, it is not the defining characteristic for Type 1. Additionally, low cure time is not specifically associated with this type of mortar, as different formulations can have varying cure times. Finally, Type 1 thin-set mortar is suitable for both floors and walls, rather than being limited to just floors. Thus, flexibility and moisture resistance stand out as the crucial traits that define Type 1 thin-set mortar.