Yes I puncture the vapor retarder when I drill through, then I fill the holes with epoxy. It's the only sure-fire way of determining depth I know of.
You have a scanner that can tell me the depth of concrete on a compacted stone base to within 1/2"?
Just because you fill the puncture with epoxy; does that unequivocally insure the puncture is sealed? I hardly think so.
So, your going to drill a test hole at every test site to insure your within 1/2 inch huh?
Not at all. At least not with slab on grade concrete. The testing protocol laid out in 2170 does a good job of exposing abnormalities, and any noted discrepancies can be further investigated by drilling confirming test holes for depth. So what I'm saying is if we install probes near exterior walls, near entrances and sprinkled throughout after that, and we know what the designed depth of the slab should be, a couple of proofing holes is all that would be required for a standard test. If probe readings start coming in all over the charts or if an installer wants to push the limits of a test, we may do more proofing.
Slabs in pans need to either use a floor scan tool or be drilled for depth to locate the flutes.
A flooring contractor used Wagners to test a new slab and the GC wanted a second opinion.
I was called in and tested a few locations using the same Rapid RH (is there anything else? Tongue ) and concurred with the flooring sub that the floor was too wet for the flooring they were installing.
The floor was put in anyway, using a latex sealer and 'special' glue. It is failing just a few months later.
I was called in again and asked to evaluate the slab, starting with RH. This is where things get more serious. We have a failure so now we have to ramp it up a bit. Even though I am being told the slab is 4" thick, I need to verify that it really is. Well guess what?