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Calcium chloride (CaCl) tests for moisture in concrete slabs have been shown to be misleading and unreliable when compared to
in situ relative humidity (RH) test results. But that’s not just our opinion...
Howard Kanare, a leading expert in concrete moisture issues, says, “With CaCl we’ve got a test which we know has no scientific basis, and in which you can get both false positive and false negative results. In effect, it’s fundamentally unreliable.”
So what moisture test does Kanare recommend? In situ relative humidity (RH) testing. “It’s the only method that’s scientifically proven for accuracy and reliability...and the best predictor of whether or not a floor covering or coating on a concrete slab will succeed or fail.” Learn More
The American Society for Testing and Materials (ASTM) has recently reduced the time period to obtain official in situ
RH test results by 48 hours. CaCl surface testing (ASTM F1869) requires waiting a full 72 hours before getting test results.
With Rapid RH® testing you’ll have scientifically valid results in only 24 hours.
This means the Rapid RH® test gives you the data you need to make important project decisions much sooner. Check out the 24-hour advantage.
Future Rapid RH® concrete slab relative humidity (RH) sensor readings can be repeated at any time with no extra equilibration time.
With the Rapid RH® testing system, recording your data is also easy and convenient. Simply add the Rapid RH® DataMaster™ app in tandem with the Bluetooth® Smart Reader for wireless tracking. That’s way less hassle versus CaCl surface test reporting.