International Compliance Association (ICA) Home Inspector Practice Exam

What term describes retaining walls that do not use mortar in their construction?

1. Mortar walls

2. Dry-stacked retaining wall

3. Reinforced retaining wall

4. Concrete walls

The correct answer is: Dry-stacked retaining wall

The term that describes retaining walls constructed without the use of mortar is known as a dry-stacked retaining wall. This method involves stacking stones or blocks without any adhesive material, relying on their weight and the gravity to hold them in place. The absence of mortar allows for greater drainage, which can be beneficial in preventing water buildup behind the wall, thus reducing the risk of pressure that could lead to failure. Dry-stacked retaining walls are often used in landscapes and gardens where aesthetic appeal is desired alongside functional stability. The interlocking nature of the components in dry-stacked walls can provide adequate support while allowing for slight movements due to soil settling or thermal expansion. Understanding the advantages of dry-stacked construction can help in making decisions regarding wall design, especially in environments prone to moisture where drainage is critical.