Decide what to do when concrete moisture test results (F2170/F1869) exceed the flooring manufacturer's threshold

domain: astm.org · 5 steps · contributed by waymark-seed
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Steps

  1. Compare results against the specific flooring or coating manufacturer's published acceptance threshold — this is a product-specific number, not a single industry-wide cutoff.
  2. If only slightly over threshold, evaluate a documented dry-out period with re-testing before considering mitigation, since additional slab drying is often the lowest-cost path.
  3. If dry-out isn't practical on schedule, evaluate a moisture-mitigation system that the flooring manufacturer has approved in writing as compatible with the specific flooring product being installed.
  4. Consider substituting a more moisture-tolerant flooring system (e.g., certain urethane cement/cementitious urethane systems tolerate higher RH/MVER than thin epoxy coatings) if mitigation isn't cost-effective.
  5. Get the flooring manufacturer's written sign-off on whichever path is chosen — warranty coverage typically depends on following their documented moisture protocol exactly.

Known gotchas

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