In conventional light-frame construction, where should joists be supported laterally?

In conventional light-frame construction, joists require lateral support to ensure stability and prevent buckling under load. The correct choice emphasizes the importance of providing lateral support at both ends and at each support point through solid blocking.

Providing lateral support at the ends and at each support ensures that the joists remain stable throughout their length, which is crucial when they are subjected to loads. This support prevents excessive deflection and enhances the overall structural integrity of the floor or ceiling system. Without proper lateral bracing, joists could twist or buckle, leading to potential structural failure.

The other options are not sufficient for ensuring the stability of the joists. Supporting only at the center or only at the ends does not provide adequate resistance to lateral forces that may act along the length of the joist. Additionally, relying solely on support at the beam neglects the need for lateral stability along the span of the joists, which could compromise the structural performance of the building.