Which of the following statements is true regarding ceiling joists and rafters?

The statement about ceiling joist ends should be lapped unless butted and toe-nailed is accurate because it addresses the structural requirements related to the connection of ceiling joists. Lapping refers to overlapping the ends of the joists, which can provide added strength and stability to the overall structure. This method helps distribute loads more effectively and reduces the potential for failure at the joint. When butting the joists, toe-nailing is a technique used to secure the ends at an angle with nails driven into the intersecting members. This practice ensures that the joists remain securely attached, maintaining the integrity of the ceiling construction.

The importance of connection methods in roof systems cannot be overstated, as they directly impact the load-carrying capacity and overall performance of the structure. Each of these methods plays a critical role in ensuring that the ceiling maintains its alignment and is capable of withstanding the forces it may encounter, such as weight from the roof or any potential lateral forces.

In contrast, the other statements do not accurately reflect the requirements or best practices surrounding ceiling joists and rafters. The notion that ceiling joists must not be used in combination with rafters is incorrect, as these two components can work together effectively in a roof framing system