What is the minimum bearing of a beam resting on a masonry wall?

The minimum bearing of a beam resting on a masonry wall is typically 3 inches. This requirement ensures that there is adequate support for the beam, allowing it to transfer loads efficiently to the masonry structure beneath. A minimum bearing length of 3 inches helps to prevent potential structural issues, such as insufficient load distribution or localized failures in the wall.

The 3-inch bearing also aligns with standard building codes and practices that prioritize structural integrity and safety. Adequate bearing not only supports the weight of the beam but also allows for possible movements, such as thermal expansion and contraction, which could occur in the materials over time. Having this established minimum in building codes helps ensure that all construction adheres to a uniform standard aimed at maintaining safety and stability in various constructions.

Other options represent larger bear lengths that may be advocated in certain scenarios or for specific types of loads but are not the universally required minimum for typical conditions.