What is the minimum bearing requirement for the ends of each rafter or ceiling joist on wood or metal?

The minimum bearing requirement for the ends of each rafter or ceiling joist on wood or metal is 1-1/2 inches. This dimension is specified in building codes to ensure adequate support and stability for the structural members. A bearing length of 1-1/2 inches is considered sufficient to distribute the load effectively, ensure a proper connection to the supporting structure, and minimize the risk of structural failure.

In practice, this measurement helps mitigate issues related to settling, shrinkage, and twisting of the wood or metal members. It also aligns with the standard practices in the industry, which are based on both safety considerations and structural integrity. Therefore, using the correct bearing length is crucial for maintaining the overall durability and performance of the roof or ceiling structure.