North Carolina Building Contractor License Practice Exam

What method should be used to clean masonry?

1. Only sand removal

2. Use of acid solutions

3. Use of potable water and detergents

4. Cold water only

The correct answer is: Use of potable water and detergents

The preferred method for cleaning masonry is through the use of potable water and detergents. This approach is effective in removing dirt, grime, and stains without causing damage to the masonry surface. Detergents help to break down the contaminants, making them easier to rinse away with water. This method is gentle yet effective, ensuring that the integrity of the masonry is preserved while achieving a clean surface. Other options may not be as suitable for a variety of reasons. For instance, using only sand removal can be too abrasive and might damage the masonry. Acid solutions, while effective in some cases, can be corrosive and harmful to certain types of masonry and the surrounding environment if not handled carefully. Cold water alone, while helpful, may lack the necessary cleaning power that detergents provide for more stubborn spots or stains. Thus, the combination of potable water and detergents is the most balanced and effective method for cleaning masonry.