Arizona ROC CR-8 Floor Covering Practice Questions - Arizona ROC CR-8 Floor Covering Examination Exam

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Under ASTM F2170, when performing in-situ relative humidity (RH) testing on a 6-inch thick concrete slab on grade that is drying from one side only, to what depth must the test hole be drilled?

1.2 inches (20% of slab thickness) 2.4 inches (40% of slab thickness) 3.0 inches (50% of slab thickness) 4.5 inches (75% of slab thickness)

Correct Answer:

2.4 inches (40% of slab thickness)

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