Uncontrolled water vapor through concrete slabs has cost building owners, designers and contractors billions of dollars. This moisture infiltration into structures contributes to the proliferation of mold, mildew and fungus and leads to flooring system failures, including adhesive failures, warping, blistering and staining. In addition, water vapor migration carrying alkali can cause structural failure of the concrete when reinforcing steel is present.
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PERMINATOR Vapor Barrier Video:
Issues Directly Related to Flooring System Failures
PMPC Vapor Barrier Video:
Underslab Vapor Barriers
The use of underslab vapor barriers is the best method and most economical solution for controlling water vapor migration through concrete slabs. The issue of admixtures and topically applied materials does not address the issue that concrete cracks or the potential for elevated PH levels.
ASTM E 1993 and ASTM E 1745 are the two industry standards for vapor barriers and retarders under concrete slabs in contact with soil. Note that typical polyethylene film does not meet the requirements of these standards because it degrades in this environment due to the high recycled content of the material.