(04-29-2013, 04:27 PM)eaadams Wrote:(03-19-2013, 08:38 PM)CC Solutions Wrote: No vapor retarder under concrete can end up being a disaster. Especially in buildings that are dehumidified often.
At world of Concrete Peter Craig said no vapor retarder invalidates the accuracy of RH testing. Scared the pants off of me.
If you think of why he said that it makes sense:
The RH probes are set at a depth where the RH measured will be the same today as it will be when the slab equilibrates.
With no vapor retarder, the moisture level is unlimited, so you cannot predict what it will be in the future.
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