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Probe Placement (Depth)

ASTM F2170 states that the RH probe should read the RH at 40% of the total depth of the slab (or 20% for a slab drying on two sides). While the standard probes are perfect for placement in the 1-1/2"-1-3/4" depth range to measure RH in a 4" slab, we often run into much thicker slabs. Are there other probes, or a longer reader to be inserted into a deeper hole, in order to measure the RH at 40% depth in an 8" or 12" thick slab? If not, how do you propose measuring the RH accurately in such a slab?

Thanks for the help.

have you seen the Rapid RH long reader? it's 5" long and I've found it to be the easiest to use on the thicker slabs.

Yes, the longer reader is so much nicer than the original short one.

In the 'old' days, we'd get the little reader down in the hole and lock it into the sensor using a stiff wire with a little bend on the end. You could still do that! Wink
JD Grafton
Concrete Answers for Flooring Problems

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