Environmental

Permafrost beneath an Alaska structure can cause which serious building problem?

ARoof collapse from ice accumulation
BDifferential settling, foundation heaving, and structural damage as permafrost thaws✓ Correct
CIncreased radon gas entry through the foundation
DMold growth in above-grade wall cavities

Explanation

Permafrost thaw causes loss of ground stability, leading to differential settling, tilting, and structural failure. Buildings in permafrost areas must be specially engineered with pile foundations or other mitigation techniques.

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