Relative humidity testing is conducted through the use of in situ probes that measure relative humidity (RH) within the slab. Their depth-specific application has proven to provide an accurate representation of moisture conditions within the concrete slab. Their very location within the concrete means they are less susceptible to environmental or ambient changes at the surface. And contrary to some opinions, RH testing is not a long involved process.
Some RH testing systems seem complex with repeated equilibration times or cables and meters to carry around. But not all RH systems are cumbersome. For example, with the Rapid RH 4.0 from Wagner Electronics, the sensor is pre-calibrated and is installed directly into the slab where it stays equilibrated. Tracking or monitoring the relative humidity in the slab becomes fast, accurate and, after the initial ASTM-required equilibration period, takes only minutes to ensure that the concrete is truly ready for the flooring application. The pen-style Reader has touch-and-go capabilities so you’re not wasting time at each test hole. When the results indicate the slab is at installation conditions, the probe is simply skim coated into the slab and installation can proceed.