For decades, the Calcium Chloride test (ASTM F1869) was the industry standard. You placed a dish of salt on the floor, covered it, and weighed it later. While better than nothing, science has moved on. Today, ASTM F2170 (In-Situ Relative Humidity) is the gold standard for concrete moisture testing, and IFTI is the leader in its execution.
The Limitation of Surface Testing
Calcium chloride only measures the moisture vapor emission rate (MVER) at the very top of the slab. However, concrete dries from the top down. The surface can be dry while deep moisture lurks at the bottom. Once flooring is installed, that deep moisture redistributes, rising to the top and causing failure.
The Science of In-Situ Probes
ASTM F2170 involves drilling into the concrete (40% of the slab thickness) and inserting a sensor. This measures the moisture condition inside the slab—the moisture that the installed flooring will actually “see” once the surface is sealed.
Specifying Independence
Architects should not only specify ASTM F2170 but should specify independent testing. Allowing the installer to test their own work creates a conflict of interest. IFTI provides the unbiased data required to defend your specification and protect the building owner.
Update your Division 09 specifications. Partner with IFTI for third-party validation.