Vapor Emission Testing
Vapor emission testing — performed per ASTM F1869 — measures the rate at which moisture vapor is emitted from the surface of a concrete slab. The test uses anhydrous calcium chloride, which absorbs moisture, to quantify the vapor emission rate over a 60-72 hour period.
Key Takeaways
- Results are expressed in pounds of water per 1,000 square feet per 24 hours
- Most manufacturers require vapor emission below 3-5 lbs for flooring installation
- The test only measures surface emission — it doesn't reflect internal slab moisture
- Surface conditions (temperature, humidity, air movement) affect test results
- F1869 is best used in combination with F2170 for a complete moisture picture
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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