F2170

F2170 refers to ASTM F2170, a standard test method published by ASTM International for determining the relative humidity (RH) of concrete in place using in-situ humidity probes. The standard is widely used in construction and flooring industries to assess moisture conditions in concrete slabs prior to the installation of moisture-sensitive flooring, coatings, or adhesives.

The method describes the equipment and procedures for placing RH probes into drilled access holes within the concrete, along with temperature sensors to accompany the RH measurement. After installation, the holes are sealed to create a controlled environment around the probes, and readings are taken over a stabilization period as defined by the standard. The resulting RH values, often recorded at specified depths below the surface, are used to evaluate whether the concrete moisture condition meets project specifications or adhesive manufacturer requirements.

Scope and application: F2170 covers the preparation of the sample area, drilling and probe installation, sealing practices, stabilization time, data collection, calculation or interpretation of results, and reporting. It is applicable to concrete floors and slabs in a variety of building types and is frequently used by contractors, inspectors, and material manufacturers to support moisture management decisions.

Relationship to other standards: F2170 is commonly used in conjunction with other moisture testing methodologies for concrete, such as surface moisture checks or moisture vapor emission tests, to provide a comprehensive view of slab moisture. While RH readings indicate in-place moisture conditions, they should be interpreted within the context of project specifications and material compatibility.