MOISTURE TEST FOR CONCRETE
Introduction
The presence of moisture in concrete may impair the products’ adhesion or affect the glued materials. It is therefore necessary to test the moisture content in concrete before applying any adhesive product.
Checklist
Method
Testing moisture content in concrete:
1. Let concrete dry for 72 hours before running a moisture test.
2. Before testing for moisture content, make sure that the concrete temperature is higher than 15ºC (60ºF). Low temperatures slow down humidity migration and affect 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 the 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. This 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 no traces of moisture are found, apply the product of your choice. If moisture is present, build a raised floor with a moisture barrier.