99% RH in concrete slab

[mwoody]

Actually 58,000 square feet and the previous use was a supermarket. There are no apparent trenches/drains installed before or after the concrete slab was placed in these areas.

To add more complexity to this issue. I replaced one of the probes and tracked the RH over several hours and then the next day. The RH started at 70% and then climbed up to 94% over several hours. The next day it read 99% and holds there.