Florida Building Code Practice Exam

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How far below the undisturbed ground surface must the bottom of foundations extend in relation to frost penetration?

The correct answer is: 12"

The correct answer is based on the minimum depth requirements set forth in the Florida Building Code, which has specific guidelines for foundation designs in areas where frost penetration can affect stability. In Florida, frost penetration is generally not a significant concern due to the state's warm climate. However, for the sake of structural integrity and risk mitigation, foundations should extend at least 12 inches below the undisturbed ground surface to ensure stability, particularly in regions where there might be frost or similar environmental effects. A depth of 12 inches accounts for variations in substrate, potential soil movement, and seasonal changes that can impact structural elements. It provides a reliable buffer against any frost action or ground settling that could compromise the foundation's integrity, making it the most appropriate choice in this context.