Home Inspection State Practice Exam

What could be a possible cause for brick chimneys curving above the roof line on older properties?

1. Degradation of brick over time

2. Improper construction techniques

3. Expansion of mortar

4. Excessive weight from snow accumulation

The correct answer is: Expansion of mortar

The curvature of brick chimneys above the roof line on older properties can often be attributed to the expansion of mortar. Over time, the mortar used between the bricks can undergo changes due to temperature fluctuations and moisture exposure. This expansion can push the bricks apart, causing them to bow or curve in response. The materials used in traditional brick chimneys were not always designed to accommodate the expansion and contraction caused by environmental factors. This uneven movement can result in structural changes, including the visible curving of the chimney. While degradation of brick over time and improper construction techniques can both contribute to issues with chimney integrity, they do not specifically address the aspect of curvature. Additionally, excessive weight from snow accumulation might lead to structural stress, but this is less likely to result in a uniform curve specifically at the point above the roof line. The primary factor in this scenario is the behavior of the mortar, leading to the characteristic curvature observed in older brick chimneys.