Which component is included in the metal category of construction?

The inclusion of metal joists in the metal category of construction is correct because they are primarily made from steel or other metal alloys. Metal joists are structural components used to support floors and roofs, and they are designed for strength and durability. They provide the necessary support for various types of loads in a building, making them a critical part of metal framing systems.

In construction, categorizing materials helps in selecting the right components for specific structural requirements. Metal components like joists are distinct from other materials such as precast concrete, which is formed using concrete components that are cast in a controlled environment. Glass block, on the other hand, is primarily a masonry product used for walls and does not belong to the metal category. Wood laminates consist of layers of wood that are bonded together, classified as timber or wood products rather than metal.

Thus, identifying metal joists as a steel component clearly places it within the structural metal category. This knowledge is crucial for understanding the various building materials and their applications in architectural design and construction.