Moisture test for concrete

 

The presence of moisture in concrete may impair the product’s adherence.

The presence of moisture in concrete may impair the product’s adherence. It is therefore necessary to test the moisture content in concrete before applying any product.

Checklist

  • Masking tape and plastic films
  • Electronic instrument (optional)

Testing moisture content in concrete:

  1. Let concrete dry for 72 hours before running a moisture test.
  2. Before testing moisture content, make sure that the concrete temperature is higher than 15ºC (60ºF). Low temperatures slow down the humidity migration and tamper results.
  3. Test the surface moisture content in 4 or 5 locations. Use an electronic instrument or attach plastic (polyethylene) films with masking tape to surface areas to be tested. Leave the plastic films on for 24 hours if the temperature exceeds 20ºC, and 3 days if the temperature ranges between 5 and 20ºC. The test cannot be run if the temperature is lower than 5ºC. After the required time, check for any signs of moisture (droplets forming under the plastic films).
  4. If there are no traces of moisture, apply the product of your choice. If moisture is present, build a raised floor with a moisture barrier.