Moisture Vapor Reduction System under cementitious underlayments

1 Moist concrete with high alkalinity

2 Vapor barrier
KOSTER VAP I 2000
KOSTER VAP I 2000 FS
KOSTER VAP I 2000 UFS
KOSTER VAP I 2000 Zero VOC
3 Primer for cementitious underlayment
KOSTER VAP I 06 Primer
4 Cementitious underlayment
KOSTER SC
KOSTER SL Premium

Moisture penetration through concrete slabs can cause severe problems for subsequent resilient 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 vapor emissions (MVER), elevated alkalinity can compromise even the toughest flooring system adhesives.  To avoid this problem, the concrete slab should be sealed with a material that will tightly bond to the concrete under these very adverse conditions.

KOSTER VAP I 2000 is a special material which fulfils all of these functions; it has a very low permeance rating (ASTM E-96 wet method: 0.04-0.09), excellent bond strength, and is resistant to sustained high alkalinity (pH 14).  The KOSTER VAP I 2000 vapor reduction system is applied to properly prepared, solid and sound substrates that are free of bond inhibiting substances.

In certain situations, resilient flooring (i.e. VCT, sheet vinyl, etc) may require a cementitious underlayment to act as a blotter layer for the adhesive, or to level and smoothen the finish prior to installing the adhesive and final flooring system.  In this event, KOSTER VAP I 06 Primer must be installed to adhere the underlayment to the KOSTER VAP I 2000 System.

Always refer to the manufacturer's specifications for use over a non-porous substrate as well as the respective Technical Guidelines.

 

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