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Light Weight Concrete on Pan Deck
03-01-2012, 01:18 PM
Post: #4
RE: Light Weight Concrete on Pan Deck
The depth of the hole will be 40% of the slab thickness when the slab is able to dry in one direction only.

On a 3" slab, 40% is 1.2 inches or about 1 3/16" deep.

The slab will be wetter at the bottom than at the top because it dries from the top. So drilling deeper ( as you said 2" was drilled) should result in higher than expected readings.

Remember to drill the hole dry, keep your bit straight so it doesn't wobble and elongate the hole, clean the hole out well and then re-clean to be sure using a vacuum and the brush, then insert the probe fully into your 1 3/16" deep hole. A little bit of the probe tube will be sticking out of the slab and that's okay.

Wait a couple of hours for a good reading.

Let me know if you need more help, I can be reached at my email addy almost always. And let us know what your new readings are!

JD Grafton
Concrete Answers for Flooring Problems
[email protected]
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RE: Light Weight Concrete on Pan Deck - CC Solutions - 03-01-2012 01:18 PM