What is Moisture Vapor Emissions Rate?

​Moisture Vapor Emissions Rate (MVER) is a test method that was developed to quantify the volume of water vapor emitting from a concrete slab surface over a 60–72-hour period of time. "

ASTM- F1869
Use this test method to obtain a quantitative value indicating the rate of moisture emission from a concrete floor and whether that floor is acceptable to receive resilient floor covering. The moisture vapor emission rate only reflects the condition of the concrete floor at the time of the test. All concrete subfloors emit some amount of moisture in vapor form. Concrete moisture vapor emission is a natural process driven by environmental conditions. All floor coverings are susceptible to failure from excessive moisture vapor emissions. The moisture vapor emitted from a concrete slab is measured in pounds. This measurement is the equivalent weight of water evaporating from 1000 sq ft of concrete surface in a 24-hour period.