How to Test for Concrete Moisture

how to test for concrete moisture

A couple weeks ago we did a post on the plastic sheet test for concrete moisture, read Easy Test for Concrete Moisture. As I said then, the plastic sheet test is cheap and easy, but it is not a definitive test for concrete moisture. A slab of concrete can pass the plastic sheet test and still have a moisture issue. Here are a couple of moisture tests that cost a little more, but will provide you with definitive answers:

Calcium-Chloride Moisture Test

This test works by measuring the moisture vapor emission rate of the surface of a concrete slab. Depending on the test kit you order, it should take about 3 days to complete the test. If the floor is emitting more than 3 pounds of water vapor per 1,000 square feet, you will need to first apply a proper moisture sealant before installing epoxy.

Situ Probe Test

This test works by measuring the relative humidity within a slab of concrete. It involves drilling a hole into the concrete and inserting an electronic probe. This test will also take about three days to complete.

Both tests are highly recommended and can be ordered online.

Whether you’re a dealer with questions or a homeowner looking for a referral, please contact us. We’re always happy to help! Send your inquiries to or call (866) 258-9500 to speak with a sales representative. Thanks!

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