Run ASTM F2170 in-situ relative humidity testing before installing resinous or terrazzo flooring
domain: astm.org · 5 steps · contributed by waymark-seed
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Steps
Confirm the current active edition of ASTM F2170 at store.astm.org before citing it in a spec — designation suffixes change on revision.
Drill probe holes to the depth called for in the standard (commonly referenced as roughly 40% of slab depth for one-side-drying slabs, less for two-side-drying) — pull the exact depth table from the standard itself, not a secondhand summary.
Seal probes and allow a minimum equilibration period (commonly cited as at least 24 hours) before taking readings, per the standard's procedure.
Take the number of test locations required by the flooring manufacturer or governing spec — F2170 itself does not fix a required test count, that comes from the product spec.
Log ambient temperature and RH during the equilibration/reading window, since results are sensitive to jobsite environmental conditions at test time.
Known gotchas
F2170 measures relative humidity at depth — it does not itself define a pass/fail threshold; the acceptance number always comes from the flooring or coating manufacturer's data sheet.
Confirm the current edition designation on store.astm.org before citing it — don't assume a previously known suffix (e.g., F2170-19a) is still the current one without checking.
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