West Virginia Contractors License Practice Exam

What type of bricks is recommended for areas that are prone to freezing but not wet?

1. MW bricks

2. SW bricks

3. HW bricks

4. FW bricks

The correct answer is: MW bricks

In areas that are prone to freezing but not wet, medium-weight (MW) bricks are recommended. MW bricks have a lower water absorption rate compared to other types, which makes them less susceptible to damage caused by freezing and thawing cycles. This is critical because, when water within the bricks expands during freezing, it can cause spalling or cracking if the brick is saturated. While other types of bricks exist—such as SW (structural weight), HW (heavy weight), and FW (frost resistant)—their properties do not align as well with the specific conditions of dry freezing environments. SW bricks may absorb more moisture, which can be problematic in freezing conditions even if they are strong, and HW bricks are heavier and not necessarily suitable for environments that are not wet. Similarly, FW bricks are designed for frost resistance, but may not be necessary in a dry climate where moisture isn't a risk. Thus, MW bricks strike the right balance of durability and moisture resistance under these particular conditions.