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The flooring looked perfect on day one. Three weeks later, bubbles formed, adhesive failed, and the entire project had to be torn out. The cause wasn’t poor installation, it was hidden moisture trapped inside the concrete slab. This scenario plays out every day on job sites around the world, which is why professionals rely on ASTM F2170 in-situ relative humidity testing before installing any flooring system. In Concrete RH Meter Rentals: How to Test Slab Moisture Accurately (ASTM F2170 Exp …