National Applied Construction Products Inc.
Moisture Vapor Transmission (MVT) ruins stone tile floors, causes problems with ceramic and porcelain adhesion and warps wood. This is often the case in low-lying geographic areas subject to MVT through substrate slabs. It is also a concern where tile is being laid before a building is closed off. Heating and air conditioning the room after the tile is laid changes the dynamics of the slab. Substrates are often subjected to high MVT at various times of the year due to ground water conditions. Multi and high-rise buildings also contribute to MVT problems. Inconsistent HVAC from unit to unit causes vapor movement and flooring failures.