When To Test Concrete To ASTM F2170?

When To Test Concrete To ASTM F2170?

The ASTM F2170 test helps determine if a concrete slab meets the required ‘dry enough’ specifications and is recommended by many international standards including ASTM, British Standards, most Scandinavian standards, as well as being specified by floor covering, coating and adhesive manufacturers worldwide. The test measures the amount of moisture vapor in the slab and can help ascertain the moisture content of the concrete floor.

Relative Humidity testing of concrete slabs

By testing the concrete floor or slab non-destructively per ASTM F2659, the flooring inspector can get an instant and precise evaluation of the moisture conditions within 1.0” below the surface of the slab. This is done by using a concrete moisture meter that gives a quantitative measurement of % moisture content by weight, like the Tramex Concrete Moisture Encounter 5 or Concrete Moisture Encounter X5


Tramex Concrete Moisture Encounter X5 measuring concrete slab


A moisture map of the entire floor can be built up, showing how wet the slab is and where the wettest locations are. Moisture mapping with the Tramex Meters App can be used in reports as explicative visual documentation and are able to be exported in files. This moisture map helps the user determine where it is best to locate the sensors for ASTM F2170. If the meter readings indicate the slab is wet, then the user must still perform ASTM F2170, but should only leave the sensors in for long enough to confirm per the manufacturer’s acceptable limits.

The Hygro-i2 Relative Humidity probes are designed to give a good indication of high relative humidity after an hour of testing. However, if the results are over the manufacturer’s specification after an hour, then it can be confirmed the slab is too wet. At this stage, the probes can be removed and the sleeves capped until further testing is required before mitigation can be carried out. This can only be done with reusable relative humidity probes, like the Hygro-i2 probes, that can be removed after one hour and reinserted at any time in the future to ensure accurate results.

Potential issues with performing the ASTM F2170 test

There is a potential for condensation to appear on the sensor during the test period, due to the high relative humidity within the concrete until the concrete has sufficiently dried. If condensation occurs during the test period, then the sensor will continue to indicate that the slab is wetter than it actually is, even if the concrete has subsequently dried. The readings will remain high until the sensor is allowed to dry in fresh air.

Make sure to conduct the test for 24 hours to fulfill the requirement of ASTM F2170 to confirm the slab is dry per manufacturer’s acceptable limits. Finally, for best results, the combination of ASTM F2659 non-destructive moisture content testing and F2170 in-situ relative humidity testing allows for a more complete picture of the moisture conditions of the slab.

ASTM F2170 test kits

The ASTM F2170 test can be carried out by a number of Tramex moisture test kits:


Why Risk it? Test with Tramex!