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Concrete Subfloors Moisture Testing

Concrete sub-floors must be constructed as per American Concrete Institute 302.2 “Guide for Concrete Slabs that Receive Moisture Sensitive Flooring” and prepared according to ASTM F 710 “Standard Practice for Peparing Concrete Floors to Receive Resilient Flooring”.

Sub-floors must be tested for moisture prior to installation.
  • Test per ASTM F 1869 “Standard Test Method for Moisture Vapor Emission Rate of Concrete Sub-floors Using Anhydrous Calcium Chloride” One test should be conducted for each 1,000 sft. Moisture limits are < 3.0/lb./1000 sft. in 24 hours.
  • Test per ASTM F 2170 “standard Test Method for Determing Relative Humidity in Concrete Floors using in-situ probes. Moisture Limit is < 80% Relative Humidity.
  • The pH of the sub-floor should be between 7-9.
If these values area exceeded the installation must be halted until corrective measures are taken.

Corrective measures may include additional curing time for the slab, or bead blasting and installation of epoxy water barrier primers. Tek Stil Concepts, Inc. or the manufacturers of ESD Unifloor or ESD Euro-flex do not provide warranties for such primers, which however may be warranted by their manufacturers.