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Trouble with meters
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06-27-2010, 08:15 AM #1
CC Solutions Concrete Moisture Evangelist *******
Status: Offline Posts:1,065 Threads:69 Joined:Dec 2009
I've been involved with several recent projects where readings of 90% RH and higher have been questioned and additional testing by others has been ordered.

Oftentimes these other persons bring in testing equipment ( I won't say manufacturers' names ) and harvest readings that are much lower than my readings recorded using the Wagner Rapid RH probes.

This is very confusing for the facility owner and the principle decision makers. I launch into defensive mode, explaining with charts and test data how slabs that are very young (maybe only two months old) and exposed to the elements just cannot be 50% - 60% RH as the opposing tests indicate. My next step is to pick away at the other probe's faults: Were the probes calibration checked within the last 30 days? Were the probes properly acclimated at each hole? Were the holes properly prepared?

In the end the Wagner probes are always proven to be correctly reading the RH levels in the slab, but weeks have been wasted and hopes of the owner pushing forward without mitigation expense are dashed. Stress levels are high, feelings are hurt, and there is no joy in proving the RH is way too high to put flooring down.

I always do my best to convince the other testing companies to adopt the Wagner system so we all don't have to go through this uncomfortable and time consuming process again.

My point here is to test your slabs and question the results. There is no way a fresh concrete slab is at 50% RH, so find out why the probe is reading incorrectly and try to remove that problem from your future testing. Time, conditions and readings will always follow a trend and make sense. If they don't you have to throw up a flag and find out why.

JD Grafton
Concrete Answers for Flooring Problems
JGrafton@ccsolves.com








Messages In This Thread
Trouble with meters - CC Solutions - 06-27-2010, 08:15 AM
RE: Trouble with meters - Ernesto - 06-30-2010, 06:34 AM
RE: Trouble with meters - CC Solutions - 06-30-2010, 01:31 PM
RE: Trouble with meters - GP-CA - 08-20-2010, 10:37 PM
RE: Trouble with meters - Ernesto - 08-22-2010, 08:34 AM
RE: Trouble with meters - eaadams - 08-22-2010, 02:54 PM
RE: Trouble with meters - Ernesto - 08-22-2010, 09:39 PM
RE: Trouble with meters - CC Solutions - 09-20-2010, 02:13 PM
RE: Trouble with meters - eaadams - 09-20-2010, 02:23 PM
RE: Trouble with meters - CC Solutions - 09-20-2010, 03:03 PM
RE: Trouble with meters - eaadams - 09-20-2010, 03:09 PM

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