What is the minimum bearing for a wood beam resting in a poured concrete wall notch?

The minimum bearing requirement for a wood beam resting in a poured concrete wall notch is specified to be 3 inches to ensure adequate support and stability of the beam. This dimension is primarily dictated by building codes, which are designed to address safety and structural considerations. A bearing of this size allows for an ample surface area for load distribution, reducing the risk of beam failure or excessive deflection under weight.

Providing at least 3 inches of bearing helps ensure that the forces from the beam are effectively transferred to the concrete wall. It also accommodates potential shrinkage in the wood and protects against moisture accumulation at the bearing point, thereby enhancing the longevity and performance of the connection.

Lower bearing dimensions, such as 1 or 2 inches, may not provide sufficient support, potentially leading to structural issues over time. Therefore, the 3-inch minimum bearing is a critical component for maintaining structural integrity and aligning with industry standards.