What is the minimum required bearing for the ends of rafters or ceiling joists on masonry or concrete?

The minimum required bearing for the ends of rafters or ceiling joists on masonry or concrete is 3 inches. This requirement ensures that the structural integrity of the roof or ceiling system is maintained and that there is enough surface area to distribute the load effectively. A greater bearing area helps prevent issues such as cracking or failure in the masonry or concrete, which can occur if the bearing is insufficient. This 3-inch requirement aligns with safety standards in the building code, emphasizing the importance of proper support and load distribution in construction practices.