What is the name for structural supports constructed of 2 x 3 inch or 2 x 4 inch members connected by gusset plates?

The correct answer is lightweight wood truss. In construction, a lightweight wood truss is a framework made up of two by three inch or two by four inch members that are interconnected using gusset plates. This type of truss is commonly used in roofs and floors to provide support while allowing for less mass than traditional framing methods, making it a cost-effective choice. The design allows for efficient weight distribution and spans longer distances, which is often essential in modern construction.

Lightweight wood trusses are important to recognize due to their structural characteristics and how they perform in fire scenarios. They can fail quickly under fire exposure due to their reduced mass and the materials used in their construction. Understanding this helps firefighters better evaluate the risks involved in battling fires in buildings using these structural supports.