General Contractor Practice Exam

What type of brick is suitable for exposure to freezing temperatures but not to water?

1. FB

2. MW

3. SW

4. W

The correct answer is: MW

The correct answer focuses on the designation of bricks based on their suitability for various environmental conditions. The classification in this case is particularly concerned with bricks that can withstand freezing temperatures while remaining unsuitable for exposure to water. The designation "MW" stands for Medium Weight brick, which is specifically designed to endure the stresses and strains associated with freezing conditions. MW bricks are formulated to have low water absorption rates, which is essential for preventing freeze-thaw damage in climates with freezing temperatures. However, these bricks may not be entirely waterproof, hence they should not be used in areas that are prone to continuous soaking or standing water. On the other hand, bricks that are designated for severe weather exposure (denoted by "SW") are suitable for both freezing temperatures and wet conditions, which is not what is required here. The other options, such as FB (Facing Brick) and W (Water Resistant), either refer to bricks meant for specific applications or conditions that do not align with the described need for freezing temperature resilience without the capacity to handle water exposure. In this way, the selection of "MW" bricks is entirely appropriate for use in situations where freezing is likely, but where water exposure is not an issue.