How much do ceiling joists overlap when meeting over a girder or partition?

Ceiling joists should overlap by a minimum of 3 inches when they meet over a girder or partition. This overlap is crucial for ensuring the structural integrity and stability of the framing. The 3-inch overlap allows for proper load distribution between the joists and the supporting elements, such as girders or walls, reducing the risk of sagging or failures in the ceiling structure.

In construction, following these specifications helps maintain building codes and standards, which are essential for safety. Additionally, this overlap provides adequate nailing surface for fastening the joists securely. It is important for contractors to be familiar with these specifications to ensure the work is performed correctly and meets the necessary building regulations.