How to measure concrete moisture using the PosiTest CMM Non-Destructive Concrete Moisture Meter, from DeFelsko.
When mixing concrete, water must be added to create a workable mix, and to allow the cement to hydrate and cure. After hardening, much of this water remains as moisture within the porous concrete slab. Over the following months, moisture is slowly emitted from the concrete until it eventually equalizes with the surrounding moisture levels.
When applying flooring materials or coatings to concrete, it is critical to ensure that the moisture level inside the concrete has decreased to acceptable levels. If not, moisture can accumulate below the flooring or coating, causing discoloration, cupping, buckling, blistering, adhesive failure, and mold growth.
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