Red Seal Bricklayer Practice Exam

What occurs when bricks expand due to heat?

1. They easily fit into joints

2. They can cause cracking

3. They change color

4. They become more durable

The correct answer is: They can cause cracking

When bricks expand due to heat, the primary concern is the structural integrity of the masonry. As bricks are heated, they undergo thermal expansion, which can lead to an increase in their size. If the expansion occurs without proper allowances for movement, it can generate internal stresses within the brick and the mortar joints. This stress can result in cracking of the bricks or the surrounding materials, which can compromise the overall strength and aesthetic of the masonry work. Understanding the properties of bricks, including how they react to temperature changes, is crucial for ensuring durability and longevity in construction. Proper installation techniques, such as including expansion joints or using flexible mortar, can help mitigate these issues.