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99% RH in concrete slab

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I have a project where 8 Wagner 4.0 RH probes were placed in a 40,000 square foot concrete slab on grade. The slab thickness is 6 inches with a vapor barrier on top of soil. The probes were placed at 40% of the depth of the slab. The slab was placed approximately 15 to 20 years ago. The HVAC has been running for over a month with the ambient temperature at 75 degrees and the humidity between 50 and 60%.

6 of the 8 probes read in the 70% to 80% range and the other two probes read 99%. The two 99% readings are on opposite sides of the warehouse. Any ideas on why the probes would read 99%?
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Messages In This Thread
99% RH in concrete slab - mwoody - 08-22-2010, 02:38 PM
RE: 99% RH in concrete slab - eaadams - 08-22-2010, 02:45 PM
RE: 99% RH in concrete slab - Ernesto - 08-22-2010, 09:42 PM
RE: 99% RH in concrete slab - mwoody - 08-23-2010, 05:54 AM
RE: 99% RH in concrete slab - eaadams - 08-23-2010, 09:17 AM
RE: 99% RH in concrete slab - mwoody - 08-27-2010, 07:24 AM
RE: 99% RH in concrete slab - eaadams - 08-27-2010, 11:33 AM
RE: 99% RH in concrete slab - Ernesto - 08-30-2010, 08:08 AM
RE: 99% RH in concrete slab - eaadams - 08-30-2010, 09:47 AM
RE: 99% RH in concrete slab - CC Solutions - 09-20-2010, 03:15 PM
RE: 99% RH in concrete slab - Floorguy - 02-03-2011, 12:55 PM
RE: 99% RH in concrete slab - eaadams - 02-03-2011, 01:53 PM
RE: 99% RH in concrete slab - Ernesto - 02-03-2011, 08:12 PM
RE: 99% RH in concrete slab - CC Solutions - 02-06-2011, 11:31 AM
RE: 99% RH in concrete slab - eaadams - 02-06-2011, 05:49 PM
RE: 99% RH in concrete slab - CC Solutions - 02-07-2011, 09:37 AM
RE: 99% RH in concrete slab - mwoody - 02-07-2011, 11:02 AM
RE: 99% RH in concrete slab - CC Solutions - 02-07-2011, 11:07 AM
RE: 99% RH in concrete slab - Ernesto - 02-14-2011, 08:37 PM
RE: 99% RH in concrete slab - CC Solutions - 02-14-2011, 09:06 PM
RE: 99% RH in concrete slab - eaadams - 02-14-2011, 11:22 PM
RE: 99% RH in concrete slab - Ernesto - 02-15-2011, 07:57 AM
RE: 99% RH in concrete slab - eaadams - 02-15-2011, 10:22 AM
RE: 99% RH in concrete slab - Ernesto - 02-15-2011, 11:43 AM
RE: 99% RH in concrete slab - CC Solutions - 02-15-2011, 03:43 PM
RE: 99% RH in concrete slab - Ernesto - 02-15-2011, 06:36 PM
RE: 99% RH in concrete slab - CC Solutions - 02-16-2011, 09:54 AM
RE: 99% RH in concrete slab - Ernesto - 02-16-2011, 05:13 PM
RE: 99% RH in concrete slab - CC Solutions - 02-18-2011, 10:11 AM

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