Footings are placed below the frost line primarily to:
Correct Answer
B) Prevent frost heave from lifting and cracking the foundation
Why this is correct: Frost heave occurs when water in the soil freezes and expands, lifting the foundation unevenly. Footings placed below the frost line rest on soil that does not freeze, preventing this destructive movement. Why the other choices are wrong: "Speed excavation during winter" is not the primary purpose. "Reduce the total concrete volume the foundation needs" is false; deeper footings may use more concrete. "Satisfy termite inspection rules" is unrelated; termite protection involves other measures. Exam tip: Frost line depth is a key regional variable in foundation design. Know its purpose.
Why This Is the Correct Answer
Why this is correct: Frost heave occurs when water in the soil freezes and expands, lifting the foundation unevenly. Footings placed below the frost line rest on soil that does not freeze, preventing this destructive movement. Why the other choices are wrong: "Speed excavation during winter" is not the primary purpose. "Reduce the total concrete volume the foundation needs" is false; deeper footings may use more concrete. "Satisfy termite inspection rules" is unrelated; termite protection involves other measures. Exam tip: Frost line depth is a key regional variable in foundation design. Know its purpose.
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