Which statement is true regarding composite steel joists?

Composite steel joists are specifically designed to be suitable for direct support of roof systems. This is due to their construction, which typically involves the use of steel and a concrete fill that enhances their structural integrity and load-bearing capacity. The composite nature allows them to effectively distribute loads, making them ideal for supporting both the roof deck and additional loads placed on the roof system.

In construction, choosing the appropriate joist type is crucial for ensuring the stability and strength of a structure. Composite steel joists provide the necessary support and can span considerable distances, which is a significant advantage in both residential and commercial buildings. Their versatility allows them to play a critical role in the overall design and functionality of roof systems.

The other options provided do not accurately reflect the capabilities of composite steel joists. They are not limited to walls or flooring, nor are they unsuitable for roof systems. Hence, the assertion that they are suitable for direct support of roof systems accurately encapsulates their intended use in construction.