Floor Layer how-to

How to Test a Concrete Slab for Moisture

Moisture ruins floors.

Updated By the Career Education Institute Curriculum Team
Quick answer

Moisture ruins floors. In short: pick; drill; seal, then complete the remaining steps below.

Step by step

  1. Pick test spots.

  2. Drill holes for RH probes.

  3. Seal and wait.

  4. Read results.

  5. Compare to manufacturer limits.

  6. Use a barrier if needed.

Safety reminders for floor layers

  • Wear knee pads
  • Control dust
  • Use saws safely
  • Ventilate adhesives

LVP · Click-lock · Floating floor · Expansion gap · Undercut saw · Self-leveler: see the full floor layer glossary.

More floor layer how-to guides

Learn this in Floor Layer trainingTake the practice test
Enroll in trainingTake fit quiz