North Carolina Building Contractor License Practice Exam

What is the preferred method for cleaning masonry?

1. Water and detergent

2. Sandblasting

3. Pressure washing

4. Wood

The correct answer is: Wood

The preferred method for cleaning masonry involves using water and detergent. This approach is effective because it allows for the gentle removal of dirt, stains, and mildew without causing damage to the masonry surface. Using a mixture of water and detergent is advisable, as it can penetrate the grime and break down contaminants, making it easier to rinse away without the harsh impact that other methods might have. Sandblasting, while effective in some situations, can be overly abrasive and lead to surface damage, including erosion of the masonry and loss of structural integrity. Pressure washing can similarly be too forceful if not carefully controlled, potentially risking damage to the masonry surface. The answer regarding wood is not appropriate for cleaning masonry, as wood cannot effectively clean masonry surfaces and could leave residues and splinters rather than achieving a clean result. Therefore, water and detergent remain the safest and most suitable choice for masonry cleaning.