What is the minimum bearing allowance where a built-up wood girder is supported in the foundation walls?

The minimum bearing allowance for a built-up wood girder supported in foundation walls is typically set at 3 inches. This requirement is based on structural engineering principles that ensure adequate support and stability for the girder, which carries loads from the structure above.

Having a sufficient bearing surface is crucial to prevent excessive deflection or even failure of the wood girder under load. The 3-inch minimum is a standard that balances the need for structural integrity with practical considerations for construction, ensuring that the girder is properly anchored to transfer loads effectively to the foundation below.

In construction practice, while larger bearing distances might be recommended in specific circumstances or for different materials, 3 inches represents a common minimum standard applicable to wood girders in many building codes and guidelines. Thus, this figure serves as a baseline for ensuring safety and performance in structural applications.