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measurement in a cold slab

#15
Have an odd slab where it is 2" ontop of a bitumin tar like hot mop over a 5-6" structural slab from the 1930's.

tester placed the wagner probes in the 1-1/2" so to not puncture the membrane / tar thing.

Results between 69% - 90% over 13 tests.

Here is my worry: slab temp > ambient temp. Somehow (and I've never seen this) the slab temp in the 50's and the air temp was 49. Ambient RH 57%.

I said I'd like to see readings taken when there is some drive with hotter air in the space (it has been cold in CA this winter). He more or less said hot air won't give good readings since this is the 'ideal' time for such testing with high humidity. I wouldn't call 57% ambient humidity high but...

Do you agree that these cold air temps encourage accurate RH readings in the Concrete?
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Messages In This Thread
measurement in a cold slab - Noweare - 12-04-2012, 02:45 PM
RE: measurement in a cold slab - CCR - 12-05-2012, 05:47 AM
RE: measurement in a cold slab - Noweare - 12-05-2012, 10:59 AM
RE: measurement in a cold slab - eaadams - 12-19-2012, 01:22 PM
RE: measurement in a cold slab - CCR - 12-19-2012, 02:12 PM
RE: measurement in a cold slab - Ernesto - 12-19-2012, 03:18 PM
RE: measurement in a cold slab - eaadams - 12-19-2012, 03:19 PM
RE: measurement in a cold slab - Ernesto - 12-20-2012, 03:37 PM
RE: measurement in a cold slab - eaadams - 12-20-2012, 04:23 PM
RE: measurement in a cold slab - Ernesto - 12-20-2012, 06:23 PM
RE: measurement in a cold slab - eaadams - 12-21-2012, 04:29 PM
RE: measurement in a cold slab - eaadams - 01-18-2013, 05:02 PM
RE: measurement in a cold slab - eaadams - 11-05-2013, 12:08 PM
RE: measurement in a cold slab - Ernesto - 04-15-2014, 02:30 PM

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