MFMA Position on RH Testing of a Concrete Slab

Reflecting where the flooring industry seems to be moving, effective October 1, 2011, the Maple Flooring Manufacturers Association (MFMA) will ONLY recognize relative humidity (RH) testing as the standard method for reading concrete moisture levels with a concrete slab.

Previous to October 1, the MFMA recognized the (industry standard) calcium chloride test, the polyethylene film test and the phenolphthalein test.

The ASTM method for RH testing is F2170 “Standard Test Method for Determining Relative Humidity in Concrete Floor Slabs Using In-Situ Probes”.

While the calcium chloride, polyethylene and phenolphthalein test only demonstrate emission from the top of the slab, relative humidity testing can show what is going on within a slab and indicate a rate of drying.

I have created the enclosed MFMA Position on RH Testing as a takeaway from this post.

MFMA maple is manufactured by only six member mills.  Advantage Sport USA distributes Tarkett Sports Flooring, who is partnered with WD Flooring to supply the ClutchCourt line of MFMA maple.  The backside of the MFMA position statement above has a comparison chart to assist in specifying the proper ClutchCourt wood system.

More information on the new RH position has been posted on the MFMA website at

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