What is the required minimum bearing for joists on wood or metal?

The required minimum bearing for joists on wood or metal is established to ensure structural integrity and provide adequate support for the loads that the joists will carry. A minimum bearing of 1.5 inches is typically specified in building codes and engineering standards as an appropriate amount that allows for proper distribution of weight and reduces the risk of structural failure.

This measurement ensures that the ends of the joists are adequately supported, not only by providing a stable surface but also by preventing potential shear or flexural failures. It is important for the joist ends to be properly seated on the bearing material to maintain the overall safety and effectiveness of the structure.

Bearings less than this minimum could lead to insufficient support, which might cause sagging or ultimately lead to structural failure. With that in mind, adherence to the 1.5-inch bearing requirement is not only a best practice but also a regulatory expectation in many building codes.