Massachusetts Construction Supervisor License (CSL) Practice Test

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Which of the following is a necessity when installing masonry units?

Weather conditions must be stormy
Mortar must be dry
Surfaces must be clean
Materials must be wet

The correct answer is: Surfaces must be clean

When installing masonry units, ensuring that surfaces are clean is absolutely vital. Clean surfaces facilitate proper adhesion and bonding of the masonry units and the mortar. Any dust, debris, or contaminants on the surfaces can result in weak bonds, leading to structural integrity issues over time. A clean surface allows the mortar to effectively grip the masonry units, ensuring they stay in place and perform as expected under various loads and conditions. Other considerations, such as weather conditions or the state of the materials, are essential but do not take priority over the cleanliness of the surfaces being worked on. For instance, while wet materials can be beneficial for certain applications, they should not substitute for proper cleaning. Ensuring cleanliness is a fundamental step in the installation process that can significantly influence the durability and quality of the finished masonry work.