CMI Certified Mold Inspector Exam

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When inspecting a vented crawl space with a ground vapor barrier, the inspector finds elevated moisture on wood joists above the barrier. The most likely cause is:

The ground vapor barrier is too thick Humid outdoor air entering through foundation vents and condensing on the cooler wood structure The HVAC supply ductwork above is poorly insulated Radon gas migrating through the barrier causing condensation

Correct Answer:

Humid outdoor air entering through foundation vents and condensing on the cooler wood structure

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