Which element is essential to providing a solid lateral support for joists?

The correct response highlights the importance of blocking in offering lateral support for joists. Blocking consists of short pieces of lumber that are placed perpendicular to the joists at regular intervals. These blocks create a stabilizing effect, preventing the joists from twisting or bending under load. By providing this additional support between the joists, blocking enhances the overall strength and stability of the floor system, which is crucial for the integrity and longevity of the structure.

In contrast, web stiffeners are typically used to strengthen the web of a metal joist, but they do not provide lateral support in the way that blocking does. Track connectors are relevant in certain framing systems, but they do not contribute directly to the lateral stability of joists. Joist hangers are specifically designed for supporting the ends of joists and securing them to beams or ledger boards, but they do not offer lateral support between the joists themselves. Thus, blocking is the key element for ensuring solid lateral support in a floor framing system.