Which component is necessary for ensuring drywall is correctly secured on the ceiling?

Ceiling joists are essential for securely fastening drywall to the ceiling because they provide the structural framework that supports the weight of the drywall and helps distribute the load evenly. When installing drywall on a ceiling, the joists offer a solid surface to which the drywall can be anchored, enhancing stability and reducing the risk of sagging or cracking.

Proper alignment of the drywall with the ceiling joists is crucial. This ensures that the screws or nails used to attach the drywall are adequately embedded in the joists, which are typically spaced 16 or 24 inches apart. This practice not only ensures a secure fit but also enables the drywall installation to meet building codes, which often require sufficient structural support for ceiling materials.

The other components listed, such as track molding, steel studs, and tile backer, play roles in specific installations or types of construction. However, they do not serve the fundamental purpose of providing the necessary support structure required for drywall installation on ceilings as effectively as ceiling joists do.