Engineering Consulting Services. VA, MD, DC. 757-362-6706
Relative Humidity and Vapor Emission testing
RH VS. Surface Emission
Before installing high-performance coatings, overlays, or commercial flooring, verifying the slab’s moisture condition is critical to prevent future bubbling, delamination, and adhesive failure. The industry relies on two primary, distinct diagnostic methods: In-Situ Relative Humidity (RH) testing and Moisture Vapor Emission Rate (MVER) testing. While they both evaluate moisture, they measure completely different variables. RH testing, governed by ASTM F2170, uses specialized probes inserted directly into drilled holes to measure the internal humidity deep within the concrete core. Conversely, MVER testing, following ASTM F1869, utilizes an anhydrous calcium chloride dome kit placed on the slab surface to measure the actual weight of water vapor escaping from the concrete over a 60-to-72-hour window.
Why testing with CMT America safeguard your project
Relying on just one test method can leave your flooring system vulnerable, as surface-level conditions frequently fluctuate with shifting ambient temperature and room humidity. Comprehensive deep-slab and surface testing by CMT Americaaccurately predicts the internal moisture equilibrium that will eventually rise to the surface after the floor covering seals the slab. Because manufacturers of industrial adhesives, epoxies, and floor systems typically outline rigid threshold limits for both parameters within their subfloor preparation criteria, our certified testing services ensure compliance with these strict warranties. Partnering with CMT America guides the proper selection of moisture vapor mitigation systems and safeguards your long-term flooring investment against catastrophic moisture damage.