Vapor Mitigation

Moisture Vapor Transmission (MVT) is the movement of water vapor from "high to low" concentrations as it attempts to reach equilibrium within its overall environment. When vapor pressure in concrete is higher than the vapor pressure in the atmosphere, water or water vapor will attempt to migrate to the surface. Moisture migrates to the top surface of the concrete through capillaries within the concrete matrix. Once it reaches the surface it will begin to wreak havoc on your flooring products and ultimately lead to a failure.

Sources of capillary moisture are:

High water table
Drainage deposits
Residual water from run-off, irrigation, etc.
Broken or leaky plumbing
Lack of, or improper installation of a positive side moisture vapor barrier

Northeast Flooring Solutions recommends a simple 72-hour moisture test before installing any flooring. Moisture concentrations in sound and durable concrete in excess of 3.0 pounds per 1,000 sq. ft. per 24 hours when tested in accordance with ASTM F1869 or with relative humidity in excess of 75% as set forth in ASTM F2170, have been known to cause failures of impervious, properly installed flooring systems. Slightly higher values may be permissible depending on the test method selected. Testing for MVT should be conducted in accordance with the two most commonly accepted test procedures; ASTM F1869 and ASTM F2170.

Far reaching problems due in part to moisture vapor transmission cost the construction industry and facility owners millions to billions of dollars each year. MVT problems attack impervious and permeable flooring materials including wood, vinyl, tile, urethane, epoxy, and carpet. Often the end result is disbondment, blistering, pin holes, chipping and pitting, adhesive reversion, and cracking and heaving. If left untreated it can introduce health concerns associated with Sick Building Syndrome - by aiding the growth of algae, bacteria, mildew and mold, as well as inducing rot.

We presently use three manufacturers when dealing with moisture related issues: Koester, Crossfield Products - Dexotex, and Ardex. Please click on the appropriate links below to learn more.