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Determine Slab Thickness

I had a tester tell me that if he doesn't know the slab thickness, he can take a small drill bit and drill through the entire slab. He says that he can 'feel' when he gets through the slab and then take that measurement AND he can do that without puncturing the vapor membrane.

Do others have suggestions on how to do this in a building where you don't have 'as builts'?

As you push with a hammer drill you sometimes feel the concrete break away at the bottom of the hole, it goes from solid to flexible, and I suppose he may know when he is close by feeling that break point. But I can't do it, I mean I'm drilling with a hammer drill not a smooth instrument.

I drill straight through with a 1/4" or 3/8" bit, fish the bottom with a wire bent on the end, and fill the hole with epoxy or polyurea.
JD Grafton
Concrete Answers for Flooring Problems

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