Red Seal Bricklayer Practice Exam

What does the term 'efflorescence' refer to in masonry?

1. A shiny coat on bricks

2. A type of brick finish

3. The white, powdery residue on brick surfaces

4. A bonding agent used in mortar

The correct answer is: The white, powdery residue on brick surfaces

The term 'efflorescence' specifically refers to the white, powdery residue that can appear on brick surfaces and other masonry materials. This occurs when moisture within the brick or mortar evaporates, leaving behind soluble salts that were previously dissolved in the water. When the water evaporates, these salts crystallize and form a white, chalky deposit on the surface. Efflorescence is a common phenomenon in masonry, especially in structures that are exposed to water, as it can indicate moisture issues that should be addressed to prevent damage to the masonry. Understanding efflorescence is crucial for bricklayers and other masonry professionals, as it not only affects the aesthetic appearance of the work but may also indicate underlying problems such as inadequate drainage, moisture retention, or poor material selection that could compromise the longevity and integrity of the masonry structure.