Limitations
There is no ASTM standard for using a concrete moisture meter to determine a final moisture content reading.
Concrete moisture meters, either non-pin or pin meters are affected by what it sees in the concrete. This can be anything from the density of the concrete and aggregate size to the chemical properties of the slab.
Uncovered concrete dries from the top down. Concrete moisture meters measure only the top inch at most and this area is drier than the concrete further down. Once a floor covering has been installed the moisture in the slab equilibrates. In order to ensure the equilibrated moisture will be a safe level for a floor covering, a relative humidity sensor must be drilled and placed at 40% of the depth of the slab. This depth has been proven to be the relative humidity percentage that the slab will equilibrate once the top has been covered by a floor covering.
Read more about this topic: Concrete Moisture Meter
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