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Heat, move air, shotblast = lower results

#1
All tests done with Wagner 4.0.

Date / test site / RH / Temp

7-11 / #1 / 94 / 73
7-17 / #1 / 94 / not recorded
[heat turned on, air moved, floor received a light shotblast to a CSP of no more than 2]
7-30 / #1 / 94 / 79
8-07 - no test

7-11 / #2 / 96 / 73
7-17 / #2 / 91 / not recorded
[heat turned on, air moved, floor received a light shotblast to a CSP of no more than 2]
7-30 / #2 / [no reading / debris]
[hole vacuumed out of debris @ time of test]
8-07 - no test

7-11 / #3 / 91 / 74
7-17 / #3 / 99 / not recorded
[heat turned on, air moved, floor received a light shotblast to a CSP of no more than 2]
7-30 / #3 / 99 / 79
8-07 / #3 / 94 / 76

7-11 / #4 / 92 / 72
7-17 / #4 / 92 / not recorded
[heat turned on, air moved, floor received a light shotblast to a CSP of no more than 2]
7-30 / #4 / 91 / 79
8-07 / #4 / 91 / 75

7-11 / #5 / 99 / 72
7-17 / #5 / 99 / not recorded
[heat turned on, air moved, floor received a light shotblast to a CSP of no more than 2]
7-30 / #5 / 94 / 79
8-07 - no test


Obviously the slab temp went up when we cranked the HVAC. I think removing the old adhesive with the light shotblast helped a lot to let moisture out just over one month.
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#2
You had three 'no-tests' on 8/7. It would help to see what those probes read.

Were the probes acclimated for 72 hours on the first test date of 7/11? If not we should discount those readings.

When the slab temp rises we expect to see a decrease in relative humidity. Additional readings would help indicate a trend. Another helpful bit of information would be ambient conditions and whether the HVAC is constantly on or just being run sporadically. Is the building envelope completed and sealed?
JD Grafton
Concrete Answers for Flooring Problems
[email protected]
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