What is the maximum width for a footing projection?

The correct choice states that the maximum width for a footing projection is the thickness of the footing. This rule reflects foundational engineering principles that ensure a structure’s stability and performance.

The footing's projection must not exceed its thickness to maintain sufficient load distribution and avoid excessive overhang, which could lead to instability or increased stress on the foundation material. This limitation helps in ensuring that the footing has enough bearing capacity to support the structure above without causing undue tension or shear forces that could compromise structural integrity.

In contrast, the other options suggest larger projections, which would exceed the safe limits for typical footing designs. Such excess could create problems like inadequate load distribution and increased risk of settlement or failure of the footing. Therefore, adhering to the maximum projection being equal to the thickness of the footing is essential for sound structural practice.