How much bearing is required on masonry/concrete for the ends of each rafter or ceiling joist?

The requirement for bearing of rafter or ceiling joist ends on masonry or concrete is typically established in the building codes to ensure structural integrity. A bearing of 3 inches is specified for the ends of each rafter or ceiling joist. This measurement ensures that the weight of the roof or ceiling system is adequately supported, allowing for appropriate load distribution and stability.

By providing this minimum bearing surface, the structure minimizes the potential for movement or failure at the connection points, which could occur if the bearing surface were inadequate. In contexts like these, building codes are designed not only for safety but also for long-term performance of the building. Therefore, adhering to the requirement of 3 inches of bearing is crucial in any construction or renovation project involving rafters or ceiling joists attached to masonry or concrete.