ASTM F1869 Testing
ASTM F1869 is the anhydrous calcium chloride test method for measuring the rate of moisture vapor emitted from a concrete slab surface. While F2170 measures internal RH, F1869 measures surface vapor emission. Many manufacturers require both tests to fully assess concrete moisture conditions before flooring installation.
Key Takeaways
- F1869 measures moisture vapor emission rate (MVER) in pounds per 1,000 sq ft per 24 hours
- Most manufacturers require MVER below 3-5 lbs for flooring installation
- The test involves placing a calcium chloride dish on the concrete and sealing it for 60-72 hours
- F1869 only measures surface conditions — it does not reflect internal slab moisture
- F1869 and F2170 are often used together for a complete moisture assessment
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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