May 2011 Rapid RH Newsletter – “Moisture Meters” vs. RH Probes
Scratching the Surface: "Moisture Meters" vs. Relative Humidity Probes
As a concrete slab dries, there is a gradual and diffuse process that must take place before it is ready for a flooring or coating application. When concrete is freshly poured, liquid water must evaporate from the surface. As that liquid evaporates, more liquid moves up through the slab to continue evaporating from the surface until only water vapor remains to move through the slab in the drying process.
But by its very nature, the process means that a slab’s surface will be “drier” than deeper into the concrete. And it is the amount of water vapor or relative humidity that must be monitored in order to meet ASTM standards and to ensure a proper flooring application.
Problems Underfoot: When Concrete Moisture and Flooring Coverings Can't Stay Connected
There is no more insidious problem in the flooring industry than recurring moisture problems in flooring installed over an improperly dried concrete slab. High moisture content in the concrete can interfere with the performance of all adhesive-dependent finished flooring products. Changes to adhesives, resulting in their contents having reduced and/or eliminated VOC’s, mean the adhesives themselves are also more moisture sensitive than in years past.
Webinar May 24 at 2pm EDT - "Troubleshooting Installations over Concrete Subfloors" with Ray Thompson Jr.
Wagner Electronics is proud to sponsor this webinar for flooring contractors, retailers, specifiers installers and more. Topics will include:
- Moisture measurement before installation
- Moisture control remediation
- Troubleshooting problems
- And much more