What is the minimum footing width required on solid rock?

The minimum footing width required on solid rock is 12 inches. This requirement is established to ensure that the footing distributes the load of the structure adequately across a stable base. Solid rock provides a very strong and stable foundation, but a minimum width is still necessary to prevent any potential localized stress concentrations that could lead to structural issues.

Footings need to be wide enough to achieve sufficient load distribution and to provide adequate bearing strength. In most building codes, including those typically followed in construction practice, 12 inches is a standard requirement for footings on solid rock to accommodate these factors. By adhering to this guideline, contractors can ensure stability and durability in the foundation of the structure, preventing problems that might arise from inadequate footing dimensions.

While the other dimensions presented might be valid in different contexts or for different base materials, the specific requirement for solid rock has been set at 12 inches for optimal safety and performance in construction practices.