ASTM F formally recognizes the use of in situ probes as a means of conducting relative humidity testing. In fact The Standard The In-Situ Method In-situ concrete moisture testing places sensors, or probes, inside the slab itself . This test method covers the quantitative determination of percent relative testing. The ASTM F standard represents a fundamental change in how. This standard is issued under the fixed designation F; the number immediately 1 This test method is under the jurisdiction of ASTM Committee F06 on.

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If you forward to 1: With all areas of ASTM-compliant RH testing, precision is key and data integrity must also be the focus for each flooring professional.

Does the finish roof product have specifications for testing the concrete deck? In-situ concrete moisture testing places sensors, or probes, inside the slab itself. Concrete slab moisture problems can cause floor covering delamination, peeling, blistering, staining and sweating.

10 Guidelines for ASTM F Compliance

At this point, if one test fails, they all fail. It has been believed that the change in the desiccant weight could be translated into a moisture ratio for the concrete beneath. The total area of the slab and the number of test holes must be recorded on your report.


Concrete absorbs water vapor from the air under high ambient humidity; concrete releases more water vapor when the humidity of the surrounding air is low. And installers are finding results are more accurate f170 more dependable with RH testing.

UPS peak season may cause delays. Standrad next five have to do with the proper installation and use of the RH test method. And moisture can still be an issue at grade so concrete foundations must be designed to include proper moisture drainage. Skip to content Concrete slab moisture is a major cause of concrete flooring failure.

These first five steps are all preparatory and should be done before any sensors or RH probes are installed. I hope this helps. First, I have to state that F is specified for interior applications that are under consistent ambient air controls.

General contractors must bear in mind two interactive processes when they are looking at construction schedules: If not, call their technical team and ask the questions. Check job site conditions.

Public Knowledge Base

Relative humidity RH in a concrete slab can fluctuate with environmental changes. Each test hole must be drilled to the depth determined at Step 5 above section 10 of ASTM F and properly prepared. That being said, there are many people that have used F testing methodology for testing roof decks with this understanding. In this way, in situ measurement provides a composite picture of overall slab moisture levels, and provides the data necessary to make business decisions regarding flooring installations.


Make sure your calibration is up to date. Preparation Confirm your test method equipment meets specifications.

10 Guidelines for ASTM F2170 Preparation and Testing

We recommend placing the serial number decal which also helps track certification of each sensor on the corresponding test hole on the mapped report. In that case, builders did not allow the slab stadard time for concrete moisture levels to equilibrate reach equilibrium moisture content according to relative humidity RH.

This site uses Akismet to reduce spam. Surface-based test results will fluctuate, even more, under these changes in environmental conditions. While any professional must understand the exact requirements of standard F the most recent versionthe following are 10 guidelines to help ensure that you have met the criteria laid out in ASTM F How do you handle this problem?

The only thing we recommend is that you ensure that there is a good seal between the sensor body and the concrete wall.

Without it, even a well-dried and functioning foundation can end up with concrete slab moisture problems. The test hole depth is not a fixed depth, but it must be calculated based on slab thickness and number of drying sides: