Moisture penetration through concrete slabs can cause severe problems for subsequent flooring systems. High concentrations of moisture and alkalinity (levels determined through testing) can lead to the deterioration of flooring adhesives and delamination of coatings by osmotic action. Even with relatively low moisture emissions (MVER), elevated alkalinity can compromise even the toughest flooring system adhesives. To avoid this problem the concrete slab should be primed with a material that will tightly bond to the concrete under these very adverse conditions.
KÖSTER VAP® 2000 is a special material which fulfils all of these functions; it has very low permeance (ASTM E96 wet: .04-.09), excellent bonding characteristics and is resistant to sustained high alkalinity (pH of 14). The KÖSTER VAP® 2000 vapor reduction system is applied to shot blasted, solid concrete substrates that are free of bond inhibiting substances. After curing, a covering layer (i.e. KÖSTER LF-VL) or any other type of final flooring may be applied. If an underlayment is required use KÖSTER VAP® Finish together with KÖSTER VAP® 06 Primer on top of the moisture mitigation system.
Always adhere to the specifications in the respective Technical Guidelines.