Construction Supervisor License Practice Exam

What type of wood is used entirely below the groundwater level supporting permanent structures?

1. Must be naturally durable

2. Must be preservative-treated

3. Is not required to be preservative-treated

4. Is not permitted

The correct answer is: Is not required to be preservative-treated

The most suitable type of wood for use entirely below the groundwater level that supports permanent structures is wood that is not required to be preservative-treated. This is primarily because certain species of wood, such as cedar or redwood, possess natural durability and resistance to decay when submerged in water, which makes additional treatment unnecessary for specific applications. Using untreated wood in these conditions can be acceptable as long as the wood itself has the inherent properties to withstand the aquatic environment without significant degradation. Many of these naturally durable woods have been used historically in marine structures, demonstrating their effectiveness. The other options imply a necessity for treatment or restrictions that may not be applicable in specific contexts where naturally durable wood is utilized effectively. Thus, while preservative treatments are important in many construction scenarios to enhance longevity and resistance to pests and decay, they are not a strict requirement when using the right types of wood in submerged applications.