Coastal and Floodplain Construction Inspector's Practice Exam

Which of the following is NOT considered flood-damage resistant wood?

1. Black Locust

2. Cedar

3. Decay resistant hardwood

4. Plywood

The correct answer is: Plywood

The choice of plywood as the option that is not considered flood-damage resistant wood is accurate because plywood, while it may offer some resistance to moisture, does not possess the same inherent properties that natural hardwoods and certain species of wood do. Flood-damage resistant wood is typically characterized by either its decay resistance or its ability to withstand prolonged exposure to moisture without significant deterioration. Black Locust, Cedar, and decay-resistant hardwoods are all known for their natural durability and resistance to decay and insect damage, which makes them preferable choices in environments susceptible to flooding. These woods maintain their integrity even when exposed to moisture, thus prolonging the useful life of structures built in flood-prone areas. Plywood, on the other hand, is a composite material made from thin layers of wood veneer glued together. Its resistance to water largely depends on the type of adhesive used and the specific treatment it undergoes. Standard plywood can absorb water, swell, and lose structural strength when exposed to sustained moisture, making it less suited for use in flood zones compared to solid wood options that inherently have better moisture resistance properties. This is why plywood does not belong in the category of flood-damage resistant wood.