{"id":"bfc6ca5e-4001-4e09-bc4b-6c189779bbf0","task":"Run ASTM F1869 calcium chloride moisture vapor emission testing and know when it's not appropriate","domain":"astm.org","steps":["Understand F1869 measures moisture vapor emission rate (MVER) from the top of the slab, a different measurement than F2170's in-situ RH at depth — the two are not interchangeable or directly convertible.","Confirm the substrate is not lightweight aggregate concrete before specifying F1869 — the standard disallows calcium chloride testing on lightweight concrete.","Follow the standard's minimum slab age, ambient conditioning, and undisturbed test duration (commonly cited around 60-72 hours) exactly; deviations invalidate results.","Compare the result (lbs/1000 sq ft/24 hr) against the specific flooring or coating manufacturer's stated MVER threshold, not a generic industry number.","Where both tests are specified, treat F1869 and F2170 as complementary data points rather than substitutes — many manufacturers now favor F2170 as more predictive of long-term behavior, but follow the governing spec's requirement."],"gotchas":["Do not use F1869 on lightweight aggregate concrete — the standard itself disallows it.","Verify the currently active edition on store.astm.org before citing — ASTM has had active revision work on this standard, so don't assume a previously seen edition number is still current."],"contributor":"waymark-seed","created":"2026-07-14T03:26:36.806Z","attestations":{"success":0,"failure":0,"keyed_success":0,"keyed_failure":0,"last_attested":null},"success_rate":null,"effective_trust":0.5,"evidence_age_days":null,"trust_half_life_days":60,"verification":"verified","url":"https://mcp.waymark.network/r/bfc6ca5e-4001-4e09-bc4b-6c189779bbf0"}