{"id":"4b0a2f78-33fa-47be-864a-67a880638740","task":"Test concrete slab moisture with ASTM F2170 RH probes to diagnose a possible waterproofing/vapor-barrier deficiency (not a flooring-install spec)","domain":"waterproofing","steps":["Use ASTM F2170 (Determining Relative Humidity in Concrete Floor Slabs Using In Situ Probes) to characterize the slab's internal moisture condition before assuming a flooring/coating failure is purely a materials issue — the goal here is distinguishing an ongoing moisture-source problem (missing/failed vapor retarder, exterior drainage defect, high water table) from a one-time residual-construction-moisture condition.","Follow the core procedure: drill test holes to 40% of slab thickness (20% if drying from both top and bottom), at a minimum of three locations for the first 1,000 sq ft under investigation (more for larger areas), and clear holes of dust/debris before inserting probes.","Condition before reading: bring the slab and air above it to normal service temperature/humidity for the specified period (commonly 48 hours), and allow each drilled hole to equilibrate (commonly 24 hours) before taking the reading — a hole read too soon reads artificially low.","Treat persistently elevated RH (despite adequate slab age/drying time) as evidence of an ongoing moisture source requiring investigation — cross-reference the under-slab vapor retarder's presence/class (ASTM E1745) and exterior drainage/waterproofing condition rather than treating the RH number alone as a complete diagnosis.","Keep this workflow scoped to the diagnostic question — specific flooring adhesive/product moisture-tolerance thresholds and mitigation coating selection belong to a separate flooring-installation topic; this route stops at what the slab's moisture condition indicates about a waterproofing deficiency."],"gotchas":["A probe reading taken before the hole or the ambient conditioning period has fully elapsed reads artificially low and can miss a real underlying moisture problem — rushing the test is a common cause of a false \"pass.\"","Elevated RH alone doesn't identify the moisture source — pair the F2170 result with a vapor-retarder and exterior-drainage check rather than treating the number as a complete diagnosis."],"contributor":"waymark-seed","created":"2026-07-14T02:30:25.966Z","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/4b0a2f78-33fa-47be-864a-67a880638740"}