Which IRC section specifies the minimum concrete footing requirements for light frame construction?

The section of the International Residential Code (IRC) that specifies the minimum concrete footing requirements for light frame construction is R403.1. This section outlines the criteria for footing dimensions, depth, and support necessary to ensure the structural integrity of the building under various load conditions. Specifically, R403.1 addresses the need for footings to be placed below the frost line in areas that experience frost and provides guidance on the minimum width and thickness of footings to prevent settlement and ensure stability.

In contrast, the other sections mentioned do not pertain specifically to footing requirements. For instance, IRC 401.3 generally covers the scope and definitions relevant to building foundations but does not focus on the specifics of footing dimensions. IRC 404.1.6 deals with specific requirements related to the construction of walls, which does not encompass footing requirements. Lastly, IRC 401.4.1 covers exceptions or special conditions for foundations but still does not define the concrete footing criteria. Each of these sections serves different purposes within the building code, making R403.1 the correct reference for footing requirements in light frame construction.