Concrete Moisture Testing
Concrete moisture testing is the single most important pre-installation step for any flooring project on a concrete slab. Concrete is a porous material that contains significant water when poured, and it continues to emit moisture vapor for months or years as it cures. Installing flooring over a slab that hasn't been properly tested is the leading cause of flooring failure.
Key Takeaways
- New concrete slabs should cure for at least 28 days before testing
- ASTM F2170 (internal RH) and ASTM F1869 (surface vapor emission) are the two primary test methods
- Surface moisture meters provide quick readings but are not a substitute for ASTM tests
- Testing must be performed at the conditions expected during normal building operation (HVAC running)
- A certified moisture test report is required by most flooring manufacturers for warranty coverage
Frequently Asked Questions
Most flooring manufacturers require ASTM F2170 and/or F1869 test results before honoring warranties. Installing over an untested slab is the leading cause of flooring failure.
ASTM F2170 requires 24 hours of equilibration after sensor installation. ASTM F1869 requires 60-72 hours. Plan accordingly before scheduling installation.
About the Author
Independent flooring inspector serving Southern California. Certified as NWFA Certified Inspector (#CP2416122), FCITS Master Inspector (#2031), NALFA Inspector, IFCII Inspector, and CFI University graduate. Specializes in forensic flooring investigations, moisture diagnostics, insurance claims, and expert witness services.
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