ARDEX WPM 422 is added to the concrete mix at the time of batching. ARDEX WPM 422 is consists of Portland cement, very fine treated silica sand and various active, proprietary chemicals. These active chemicals react with the moisture in fresh concrete and the by-products of cement hydration to cause a catalytic reaction, which generates a non-soluble crystalline formation throughout the pores and capillary tracts of the concrete. Thus the concrete becomes permanently sealed against the penetration of water or liquids from any direction. The concrete is also protected from deterioration due to harsh environmental conditions.
Not a vapor barrier – allows concrete to breathe
Permanent: Added to the concrete at time of batching and therefore is not subject to climatic restraints