In the example footings, what is the depth of the footing?

In the example footings, what is the depth of the footing?

• A. 1 ft
• B. 2 ft
• C. 3 ft
• D. 4 ft

Answer: (B)

Footing depth is about reaching soil that can safely bear the load and staying below the frost line to prevent movement. In the example, two feet is chosen because that depth places the footing into the stable bearing soil shown and below the frost line indicated for the scenario. That combination provides adequate support for the loads without the risk of frost heave. A shallower depth wouldn’t clear the frost line or reach stronger soil, while a deeper depth isn’t needed for the shown loads and would add unnecessary cost.

Footing depth is about reaching soil that can safely bear the load and staying below the frost line to prevent movement. In the example, two feet is chosen because that depth places the footing into the stable bearing soil shown and below the frost line indicated for the scenario. That combination provides adequate support for the loads without the risk of frost heave. A shallower depth wouldn’t clear the frost line or reach stronger soil, while a deeper depth isn’t needed for the shown loads and would add unnecessary cost.