One-Coat Vapor Barrier Moisture Mitigation System
Product Announcement from KOSTER American Corporation
The KOSTER VAP 1® pH is a one-coat system, which consists of a unique combination of epoxy resins and other chemical substances. It is specifically formulated to overcome the poor long-term adhesion properties of most resin-based systems when curing in an environment of constant wetness, extreme alkalinity (pH 13-14) and water vapor drive. Because of its extreme density it is capable of reducing water vapor and moisture to levels acceptable for most coatings, adhesives, and floor covering systems. The KOSTER VAP 1® pH is in full compliance with VOC regulations, it is unaffected by a constant exposure to pH 14 (ASTM D-1308) and provides water vapor reduction of up to 80% when tested according to ASTM E96-95, wet method. (10 lbs. to below 3 lbs. and 12 lbs. to below 5 lbs. /24 hour /1000 ft.) Always test adhesion properties of materials to be applied onto VAP 1® pH prior to application. Before application of any material onto the KOSTER VAP 1® pH, allow VAP 1® pH to cure for a minimum period of 16-24 hours depending upon environmental conditions.
The primary recommended use for the KOESTER VAP 1® pH System is to solve the problems of alkalinity /moisture/water vapor emission, through mineral based substrates like concrete floors, screeds etc., by reducing these vapors to levels that do not interfere with the adhesion of floor coverings. It provides an excellent primer for most coatings and adhesives that cures fast and can be used indoors due to its low odor and no flammability. The KOESTER VAP 1® pH can be applied to concrete and other cement-based toppings that are compatible and fit to be used under vapor reduction systems and have been allowed to cure for a minimum period of 7 days. These unique properties allow the system to provide a solution as a base coat to pH/moisture/water vapor-sensitive coatings like polyurethanes epoxy as well as adhesives with regard to their long-term adhesion. It enables their application on relatively fresh cement-based substrates. Since conditions vary from job to job, it is recommended that a test area be coated and tested for water vapor transmission to assure performance of the system. Substrate should have a minimum compressive strength of 2500 PSI.