NCIDQ IDFX Practice Exam

What type of members do plywood web joists typically consist of?

1. Wood and metal

2. Concrete and steel

3. Top and bottom chords with a plywood web

4. Only solid wood

The correct answer is: Top and bottom chords with a plywood web

Plywood web joists are specifically designed with top and bottom chords that are commonly made of solid wood or engineered wood, and they feature a web component constructed from plywood. This construction method takes advantage of the lightweight nature and strength of plywood as a web material, which effectively reduces weight while maintaining structural integrity. The arrangement allows for efficient load distribution and helps create a deeper structural member without the need for solid wood throughout, which can be heavier and less efficient. It’s also important to note that the use of plywood in this context contributes to the overall stability and durability of the joist. The design not only enhances the performance of the joist but also allows for greater spans and versatility in various architectural applications. Thus, this combination of top and bottom chords with plywood as the web ensures that plywood web joists serve as an effective solution in contemporary building practices.