Red Seal Bricklayer Practice Exam

Why is expansion and contraction a concern in bricklaying?

1. It can cause bricks to change color

2. It can lead to structural instability

3. It can create alignment issues

4. It can affect insulation performance

The correct answer is: It can lead to structural instability

Expansion and contraction in bricklaying is primarily a concern because it can lead to structural instability. Brick and mortar are subjected to changes in temperature and humidity, which causes them to expand and contract. When these materials do not have adequate room to move or if expansion joints are not incorporated into the structure, this movement can exert stress on the bricks and mortar joints. Over time, repeated cycles of expansion and contraction may result in cracks in the bricks or in the mortar, which can weaken the overall integrity of the wall. This can lead to significant problems, such as sagging or leaning walls, which ultimately compromises the structural stability of the building. Thus, proper planning and incorporation of expansion joints are essential practices in bricklaying to accommodate these movements and maintain the safety and durability of the construction.