Moisture Tests: Calcium Chloride vs. Relative Humidity

by David Thompson

When good floor coatings go bad, moisture is often the culprit.

Even cured concrete can emit enough moisture to blister, cloud or delaminate a coating, especially when a slab with no vapor barrier sits on ground with poor drainage. The manufacturers of overlays, microcoatings, sealers and specialty coatings set moisture tolerance limits for their products. Ignore those limits and all bets are off that the coatings will perform as intended.

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Vol. 9, No. 7
Nov/Dec 2009