What is the minimum bearing requirement for a roof truss on a concrete foundation wall?

The minimum bearing requirement for a roof truss on a concrete foundation wall is indeed 3 inches. This requirement is set to ensure that the truss has adequate support and stability when resting on the foundation wall. A proper bearing length distributes the load effectively and reduces the risk of structural failure over time.

Using a minimum of 3 inches helps to accommodate variations in construction tolerances and allows for proper alignment of the trusses, which is critical for the overall integrity of the roof structure. Insufficient bearing length, as would be the case with shorter options, could lead to insufficient support, increased deflection, or even the potential for the truss to slip off the foundation wall, jeopardizing the building’s safety and longevity.